Description

ELECTRIC CONNECTING DEVICE AND ELECTRIC ESTABLISHMENT WITH ELECTRIC CONNECTING DEVICE

Technical Field

[1] The present invention relates to an electric connecting device that has a fixed body installed on a ceiling, post, or other elevated position, and supplies electrical power to an electrical device by connecting terminals of the fixed body to the electrical device during operations, and to an electrical fixture having the electric connecting device installed therein. Background Art

[2] In order to repair electrical devices such as lamps or CCTV cameras installed in elevated positions, a service person must use a special vehicle that elevates a basket to reach the height at which the electrical device is installed.

[3] This repair method presents a repair person with the risk of injury, and also reduces task efficiency. Korean Patent Registeration No. 10-0602613 entitled "ILLUMINATOR HAVING ASCENDING AND DESCENDING DEVICE," which is incorporated hereby in its entirety by reference, proposes a way to overcome this limitation.

[4] FIG. 1 is a structural diagram of an elevating device for a lamp, etc. disclosed in

Korean Patent Registration No. 10-0602613.

[5] Referring to the FIG. 1, in the elevating device for a lamp, etc., a main body 1 is installed on a high ceiling through a fastening portion 2 installed at the upper portion of the main body 1, and a lamp 3 is installed in the lower part of a lamp portion 4 that is detachable from the main body 1. Also, a hollow guide bushing 6 is installed within a cylindrical housing 5 of the main body 1, the center of the lamp portion 4 is installed upward in the cavity of the guide bushing 6, and a guide post 7 formed with a stepped portion can be raised or lowered by means of a wire 8. Furthermore, the stepped portion of the guide post 7 is supported elastically upward by a spring, and the guide post 7 is maintained in a rocking state and prevented from moving downward. A clamp 10 is installed to end the rocking state of the guide post 7 by using a clamp wire 9.

[6] Terminal portions 13 and 14 are installed at the lower ends of torsion springs 11 and

12 installed at the sides of the guide bushing 6, and round terminal plates 15 and 16 are installed on the lamp portion 4, so that when the clamp 10 is locked where the guide post 7 is inserted and fixed in the guide bushing 6, the terminal portions 13 and 14 and the terminal plates 15 and 16 contact one another to illuminate the lamp 3. When the clamp 10 is unlocked and the guide post 7 disengages from the guide bushing 6 (or the

guide post 7 moves downward, the terminal portions 13 and 14 are separated from the terminal plates 15 and 16 so that the lamp 3 is switched off. Disclosure of Invention

Technical Problem

[7] To service the lamp 3 in the above ascending and descending device according to the related art, in order to move the lamp downward, the clamp wire 9 is pulled to unlock the guide post 7, and then one strand of wire 8 that is connected to the upper end of the guide post 7 is released so that the guide post 7 is moved downward. The entire lamp portion 4 is moved downward with the movement of the guide post.

[8] In this device according to the related art, when the lamp portion 4 is moved downward, rotation occurs when tension is applied to wire 8, so that the lamp portion rotates due to effects of weight eccentricity, wind, etc.

[9] The terminal plates 15 and 16, as the contacting points for the lamp portion of the ascending and descending device according to the related art, are circularly shaped in order to prevent disruptions in electrical contact when rotation of the lamp portion 4 occurs. However, because the circular terminal plates 15 and 16 are distributed over a wide area, there is always the possibility of shorts occurring between the circular terminal plates 15 and 16 due to dust and moisture.

[10] Also, the structure of the ascending and descending device can accommodate the installation of a light bulb or other simple electrical device through the simple, detachable lower structure; however, when a plurality of electrical sockets (contact points) in the detachable structure is needed to allow the installation of a CCTV camera, wireless communication data transmitter/receiver or other electrical device requiring ports for both the supply of electricity and transmission/reception of data, various terminal plates of different diameters must be installed, so that the danger of short circuiting between terminal plates increases.

[11] Furthermore, in the above-described ascending and descending device, because the entire weight of the lamp portion 4 is exerted on the wire 8 that raises and lowers the lamp portion 4, the wire 8 must be of a sufficient thickness to support the weight of the lamp portion 4, and the winding device must be of a sufficient size as well.

[12] Additionally, even after the above-structured ascending and descending device is assembled, shorts can occur between the contact points thereof due to external causes that prompt the lamp portion to rotate or undulate.

[13]

Technical Solution

[14] To overcome the above limitations, an object of the present invention is to provide an electric connecting device that prevents rotation of a moving body installed in an

electrical device detachable from a fixed body, and an electrical fixture including the electric connecting device.

[15] Another object of the present invention is to safely and precisely connect a moving body and a fixed body when they are formed with a plurality of contact points and terminal structures.

[16] A further object of the present invention is to reduce the tension on a wire.

[17] Still further objects of the present invention will be described below in embodiments of the present invention.

[18]

Advantageous Effects

[19] An advantage of an electric connecting device according to the present invention is that an electrical device installed in a high position can easily be inspected or repaired. [20] Also, the present invention may be applied not only to lamp fixtures, but also to cameras and other complex devices requiring transmitting/receiving of various data format. [21] Furthermore, during raising or lowering of the electrical device, twist of the wire can be prevented. [22] Further, when the moving body is inserted into the fixed body, rain water during rainy weather is prevented from flowing to the electrically contacting portions. [23] Still further, because the moving and fixed bodies are mutually inserted, disengagement of the moving and fixed bodies from one another can be prevented. [24] Additionally, a roller installed at the lower end of the moving body reduces the tension on the wire by half. [25]

Brief Description of the Drawings [26] FIG. 1 is a sectional, structural view of an elevating device for a lamp, etc. disclosed in Korean Patent Registration No. 10-0602613. [27] FIG. 2 is a phantom perspective view showing a moving body separated from a fixed body according to an embodiment of the present invention. [28] FIG. 3 is phantom perspective view showing the moving body installed together with the fixed body according to an embodiment of the present invention. [29] FIG. 4 is an exploded perspective view showing the structure of the fixed body in

FIGS. 2 and 3 in detail. [30] FIG. 5 is an exploded perspective view showing the structure of the moving body in

FIGS. 2 and 3 in detail. [31] FIG. 6 is a perspective view of a fixture support according to an embodiment of the present invention.

[32] FIG. 7 is an exploded perspective view of a redirecting roller installed in the fixture support in FIG. 6.

[33] FIG. 8 is a perspective view showing a moving body coupled to a fixed body in an electrical fixture according to another embodiment of the present invention.

[34] FIG. 9 is a perspective view showing the moving body separated from the fixed body shown in FIG. 8.

[35] FIG. 10 is a perspective view showing the operation of the lamp post in FIG. 8.

[36] FIG. 11 is a phantom perspective view of a fixed arm head and a rotating arm head of the embodiment shown in FIG. 8.

[37] FIG. 12 is a phantom perspective view showing the fixed body and moving body in

FIG. 8 in a coupled state.

[38] FIG. 13 is a phantom perspective view showing the fixed body and moving body in

FIG. 8 in a separated state.

[39]

Best Mode for Carrying Out the Invention

[40] An electric connecting device includes: a fixed body including a socket installed thereon, the socket defining two through holes and a power supply plug installed therein; a moving body including an installed electrical terminal for contacting the power supply plug, two guide rods inserted respectively into the through holes and respectively having a through hole formed centrally therein along a length thereof, and a roller installed at a side opposite to the installed guide rods; and a wire of which a leading end is installed on a winding device and a trailing end is passed through one of the two through holes of the socket and the through hole of one of the guide rods, and wound around the roller, and then passed through the through hole of the other guide rod and the other of the two through holes of the socket, and then terminated at the fixed body, wherein when the wire is wound by the winding device, the guide rods are inserted into the through holes of the socket such that the power supply plug and the electrical terminal are brought into contact, and when the wire is unwound, the moving body is separated from the fixed body such that the power supply plug and the electrical terminal are separated.

[41] The fixed body may further include a thrust bearing, wherein a portion of the wire that passes through the other of the two through holes of the socket may be passed through the thrust bearing and terminated.

[42] The fixed body may further include a cylindrical housing, and the moving body may further include a moving body housing that is inserted into or over the housing of the fixed body.

[43] The housing of the fixed body may include a stopper formed within to restrict an

inserted length of the housing of the moving body.

[44] The electrical connecting may further include: a locking blade protruding upward from an upper center of the socket, and having serrations formed therein; and a locker pivotably installed to a frame installed within the housing of the fixed body, the locker including one end to which a locking wire is pivotably connected and at which a spring is biased in a direction opposite to a pivoting direction of the locker when acted upon by the locking wire, and a locking portion at the other end of the locker, for performing locking through supporting the serrations from below, wherein the locking is performed through the supporting of the serrations from below by the locking portion when the locking blade is raised, and the locking portion is unlocked through disengaging from the serrations when the locking wire is pulled.

[45] The housing of the moving body may have an electrical device installed at an end thereof.

[46] The electrical device may be one of a CCTV, a lamp, and a wireless communication device.

[47] The fixed body may be supported by a post with a cylinder protruding from either side of the post, a support may be installed in an inner, upper portion of the cylinder, a detachable redirecting roller may be installed on the support within the cylinder, and the wire and the locking wire may be wound on the redirecting roller for redirection.

[48] The guide rods may be tapered at top ends thereof, and guide rod caps may be installed thereon to guide an insertion of the guide rods in the through holes of the socket.

[49] An electrical fixture having an electric connecting device includes: a post installed perpendicularly to a ground surface; a fixed arm installed perpendicularly at an upper portion of the post, and having a fixed arm head coupled to an end thereof; a pivoting arm coupled by a hinge at one end to the fixed arm, and having a pivoting arm head installed at the other end thereof for coupling to or separating from the fixed arm head; a fixed body installed on the pivoting arm head; a moving body that couples to or separates from the fixed body; an electrical device installed on the moving body; a wire for coupling or separating the fixed arm head and the pivoting arm head, and coupling or separating the fixed body and the moving body; a shock absorber having one end connected to the pivoting arm and the other end connected to the fixed arm, such that when the pivoting arm pivots with respect to the fixed arm, the shock absorber varies in length according to the pivoting of the pivoting arm; and a winding device capable of winding or unwinding the wire.

[50] An electrical fixture having an electric connecting device includes: a post installed vertically on a ground surface; a fixed arm installed perpendicularly on the post; a fixed body installed on an end of the fixed arm and including a socket installed

thereon, the socket defining two through holes and having a power supply plug installed thereon; a moving body including an electrical terminal for contacting the power supply plug, guide rods with through holes formed through respective centers along lengths thereof and inserting into the through holes of the socket, and a roller installed at a side opposite to where the guide rods are disposed, the moving body for supplying power to an electrical device connected to the electrical terminal; and a wire with a leading end installed on a winding device, and a trailing end passing through one of the two through holes of the socket and one of the through holes of the guide rods and then wound around the roller and then through the other of the through holes of the guide rods and the other through hole of the socket and then terminated at the fixed body, wherein when the wire is wound by the winding device, the guide rods are inserted in the through holes of the socket such that the power supply plug and the electrical terminal come into contact, and when the wire is unwound, the moving body is separated from the fixed body through gravity such that the power supply plug and the electrical terminal are separated.

[51] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[52] FIG. 2 is a phantom perspective view showing a moving body separated from a fixed body according to an embodiment of the present invention, and FIG. 3 is phantom perspective view showing the moving body installed together with the fixed body according to an embodiment of the present invention.

[53] A fixed body 20 includes an upper housing 21 (in which there is a device for coupling or separating a moving body 50 inside a cylindrical fixed body housing 27), and a cylindrical lower housing 22 extending from the bottom of the upper housing 21 and having an inner circumference that is the same as the outer circumference of the upper housing 21. A stepped portion is formed by a discrepancy in the respective radii of the contacting portions of the upper housing 21 and the lower housing 22. A cylindrical cap 23 with a closed upper surface is installed on the upper end of the upper housing 21.

[54] A fixed body socket 31 is installed within the lower end of the upper housing 21, and a lower frame 37 is installed on the upper surface of the fixed body socket 31. An upper frame 25 is installed on the bottom surface of the cap 23, and transverse frames 24, 24' and 24" are installed between the lower frame 37 and the upper frame 25. A supporting frame 28 for supporting a guide roller 34 and a thrust bearing 26 is installed on the transverse frames 24 and 24', of which a detailed description will be given below.

[55] A locker frame 30 is installed in the central portion of the lower frame 37, a locker

33 that operates through a locking wire 35 and spring 29 is installed at the upper

portion of the locker frame 30, and a plurality of plugs 32 protrudes toward the lower portion on either side of the fixed body socket 31. The plugs 32 define through-holes through which guides 51 and 52 of the moving body 50 pass.

[56] When coupled to the fixed body 20, the moving body 50 is inserted into the lower housing 22 of the fixed body 20. The moving body 50 includes a cylindrical moving body housing 56 with a stopper 81 formed around the inner circumference of the moving body housing 56, a moving body socket 53 that is press fitted against the stopper 81 formed around the inner circumference of the moving body housing 56, and an electrical device 57 that is one of various types, such as a CCTV camera, lamp, and wireless communication device installed at the lower end of the moving body housing 56.

[57] Roller supporting frames 54 and 54' are installed downward at the lower portion of the moving body socket 53, and a moving body roller 58 is installed on the roller supporting frames 54 and 54'.

[58] A plug inserting terminal 59 in which the plug 32 inserts is installed on the upper surface of the moving body socket 53, a locking blade 60 with a plurality of serrations 61 formed in the upper portion thereof is installed at the center of the moving body socket 53, and two guide tubes 51 and 52 are installed upward on the moving body socket 53.

[59] The guide tubes 51 and 52 have a tapered form at the top so that they can be easily inserted into the through holes of the fixed body socket 31. The guide tubes 51 and 52 also have through holes formed through the centers thereof so that the wire 36 may pass therethrough.

[60] The wire 36 inserted perpendicularly into the fixed body 20 is redirected at 90°by the guide roller 34 and lowered, and the wire 36 passes through one of the through holes of the fixed body socket 31 and passes through the through hole of the guide tube 51 and protrudes toward the bottom of the moving body socket 53. The wire 36 is wound around the moving body roller 58 that redirects the wire 36 180° so that the wire passes upward through the through hole of the guide tube 52 and then through the other through hole of the fixed body socket 31 and the thrust bearing 26, at which point it ends.

[61] The starting end of the wire 36 is installed on a winding device (not shown) that either unwinds or winds the wire 36. When the wire 36 is wound by the winding device, the moving body 50 is gradually raised. When the moving body 50 is raised, the guide tubes 51 and 52 are inserted into the through holes of the fixed body socket 31, and then the locker 33 locks the locking blade 60, so that the plug 32 of the fixed body 20 is inserted into the plug inserting terminal 59 of the moving body 50, as shown in FIG. 3. In this state, supplying of electrical power and transfer of data occurs

between the fixed body 20 and the moving body 50.

[62] In this coupled state, when the locking wire 35 is pulled, the locked state of the locker 33 and the locking blade 60 is unlocked, and when the winding device is operated in the unlocked state to unwind the wire, the moving body 50 moves downward and is separated from the fixed body 20, as shown in FIG. 2.

[63] Here, because the moving body roller 58 moves, it reduces the weight of the moving body 50 and thus the tension on the wire 36 by half. Therefore, compared to an electric connecting device that does not employ a moving body roller 58, a thinner wire can be used.

[64] The end of the wire 36 is fixed after being passed through the thrust bearing 26, so that the thrust bearing 26 straightens any twist in the wire to prevent rotation of the moving body 50.

[65] When the moving body 50 is inserted in the fixed body 20, the outer circumference of the moving body housing 56 is designed to contact the inner circumference of the fixed body lower housing 22. Because the top surface of the moving body housing 56 comes into contact with the stepped surface formed between the fixed body upper housing 21 and the lower housing 22, the moving body 50 does not move further.

[66] Also, infiltration of water into the above-structured moving body 50 can be entirely prevented.

[67] FIG. 4 is an exploded perspective view showing the structure of the fixed body in

FIGS. 2 and 3 in detail.

[68] Three plate-shaped transverse frames 24, 24', and 24" with a uniform width are installed between the circular band-shaped upper frame 25 and the disk-shaped lower frame 37 at a 90° angle. Also, L-shaped parts 28' and 28" formed respectively of a vertical and horizontal portion form a supporting frame 28, and the upper end of the vertical portion of the supporting frame 28 is connected to the upper frame 25, and the end of the horizontal portion is fastened to the transverse frame 24". Also, the horizontal portions of the supporting frame 28 are prevented from moving by a pin 38 that passes therethrough and is installed between the transverse frames 24 and 24'. Through holes are formed at the edge of the supporting frame 28 where the horizontal and vertical portions meet, and a pin 39 that passes through these through holes is installed with snap rings. The pin 39 is used as an axis of rotation for a guide roller 34 installed between the two parts 28' and 28". The guide roller 34 redirects the wire 36 90° downward.

[69] A bearing installing plate 40 for installing a thrust bearing 26 is installed on the top surface of the horizontal portions of the supporting frame 28, and a through hole through which the wire 36 passes is formed in the installing plate 40. The wire 36 passes through the centers of through hole of the installing plate and the thrust bearing

26, and is fixed at the end portion thereof (not shown) installed at the upper surface of the thrust bearing 26.

[70] A through portion through which the locking blade 60 passes is formed in the center of the lower frame 37, and a locker frame 30 formed of two upwardly directed parts is installed on either side of the through portion. A protruding portion protruding to one side is formed at the upper portion of the locker frame 30, and a through hole is formed in the protruding portion. A bolt 46 that acts as an axis of rotation for the locker 33 is fastened in the through hole with a nut 47. Springs 44 and 45 are installed on the bolt 46.

[71] The locker 33 includes a diagonal portion formed with through holes 41 and 42 on either end portion, a vertical portion extending downward from the approximate center of the diagonal portion, and a horizontal portion 43 bent and extending from both sides of the bottom of the vertical portion. The locking wire 35 is connected to the through hole 41, such that when the locking wire 35 is pulled, the front end of the horizontal portion 43 is raised upward. The bolt 46 is passed through the through hole 42 so that the locker 33 pivots with respect to the locker frame 30. The ends of the pins 44 and 45 support the outer portion of the vertical portion of the locker 33. When the locking wire 35 is pulled so that the vertical portion rotates outward, a restoring force is imparted on the locker 33 to rotate the locker 33 back inward.

[72] The upper surface of the front end of the horizontal portion 43 is a horizontal surface, and the bottom surface is formed as a surface tapered upward toward the front. Thus, the serrations 61 of the locking blade 60 are formed in the shape of a plurality of saw teeth consisting of horizontal surfaces and tapered surfaces inclined inward and upward from the ends of the horizontal surfaces. When the serrations 61 of the locking blade 60 are raised, the tapered surfaces of the serrations 61 push the tapered surface of the locker 33 to pivot the locker 33. When the raising of the serrations 61 is completed, the front end of the horizontal portion 43 of the locker 33 receives restoring bias from the springs 44 and 45, so that the lower portions of the horizontal surfaces of the serrations 61 are supported, and the locking blade 60 is prevented from moving downward by being locked.

[73] Through holes 72 and 73 through which the guide tubes 51 and 52 of the moving body 50 pass are formed in the fixed body socket 31, and a plurality of plugs 32 are installed at the bottom portion of the fixed body socket 31. The fixed body socket 31 forms wire entrances for connecting wires to the top ends of the plugs 32, and a screw hole for screwing the lower frame 37 together with screws 74 and 75.

[74] The side surface of the fixed body socket 31 is formed in a cylindrical shape, and a stepped portion is formed at the lower portion of the side surface, so that the stepped portion catches on the lower end of the upper housing to prevent it from being pushed

further when the fixed body socket 31 is pushed from the lower housing 22 to the upper housing 24.

[75] When the fixed body socket 31 is installed on the upper housing 22, the transverse frames 24, 24' and 24", the locker frame 30, and the supporting frame 28 are coupled to the upper frame 25 and the lower frame 37, the locker 33 is installed on the locker frame 30, and the guide roller 34 and the thrust bearing 26 are installed on the supporting frame 28, after which the frames are inserted from the top of the upper housing 22 to the bottom to fasten the lower frame 37 to the fixed body socket 31 with screws 74 and 75.

[76] The cap 23 is made to cover the upper portion of the upper housing 22 by coupling the cap 23 to the upper housing 22 by means of a screw 74 in a screw hole formed at the side of the cap 23.

[77] FIG. 5 is an exploded perspective view showing the structure of the moving body in

FIGS. 2 and 3 in detail.

[78] A stopper 81 is formed around the inner circumference of the moving body housing

56, so that when the moving body socket 53 is pressed from the bottom upward into the moving body housing 56, a flange 82 formed on the outer circumference of the moving body socket 53 contacts the stopper 81. Also, two guide tubes 51 and 52 with hollow centers are installed in an upward direction on the upper surface of the moving body socket 53. Guide tube caps 83 and 84 with curved surfaces are installed on the top ends of the guide tubes 51 and 52, in order to allow smooth passage of the wire 36 when passed through the centers of the guide tubes 51 and 52 and inserted into the through holes 72 and 73 of the fixed body socket 31. The lower ends of the guide tubes 51 and 52 are connected to the through holes of the moving body socket 53. The wire that passes through the guide tube 51 is redirected by the moving body roller 58 in the reverse direction, and the redirected wire passes through the through hole of the moving body socket 53, the guide tube 52, and the thrust bearing 26 to end at the end portion.

[79] Terminal insert holes are formed in the upper surface of the moving body socket 53, and plug insert terminals 59 and 59' are coupled thereto by means of bolts 87 and 88 and nuts 87' and 88'.

[80] Roller supporting frames 54 and 54' are installed at the bottom surface of the moving body socket 53, a pin 85 is fastened to the roller supporting frames 54 and 54' by E-type and O-type snap rings, and a moving body roller 58 that uses the pin 85 as an axis for rotation is installed on the pin 85.

[81] An electrical device 57 is installed at the lower portion of the moving body housing

56 by means of screws.

[82] FIG. 6 is a perspective view of a fixture support according to an embodiment of the

present invention, and FIG. 7 is an exploded perspective view of a redirecting roller installed in the fixture support in FIG. 6.

[83] The support in FIG. 6 includes a vertical portion 101 installed vertically and an arm

102 bent to extend horizontally from the top end of the vertical portion 101. A fixed body 20 is installed at the end of the arm 102, and a moving body 50 is coupled to and separated from the fixed body 20 by means of a wire 36 and a locking wire 35.

[84] A winding device (not shown) for winding the wire 36 and the locking wire 35 is installed at the lower part of the vertical portion 101, and the wire 36 and the locking wire 35 that are unwound from the winding device pass through the inside of the vertical portion 101 and are redirected by a redirecting roller 103 installed at the portion at which the vertical portion 101 and the arm 102 are connected, after which they pass through the inside of the arm 102 and are inserted into the fixed body 20.

[85] Referring to FIGS. 6 and 7, cylinders are formed in the part of the vertical portion

101 connected to the arm 102, to extend perpendicularly to the arm 102. A flat plate frame 104 is supported at the inner, upper portion of the cylinders 105 and 106 to form a support.

[86] Two roller frames 104' and 104" are installed to extend downward from the lower portion of the flat plate frame 104, and a redirecting roller 103 rotates around a central pin 107 secured at either end to the roller frames 104' and 104" by snap O-rings. The redirecting roller 103 redirects the wire 36 and the locking wire 35 by 90°.

[87] Because it is difficult to wind the wire 36 and the locking wire 35 around the redirecting roller 103 with the redirecting roller 103 installed in the vertical portion 101, after the wire 36 and locking wire 35 is wound around the redirecting roller 103 with the plate frame 104 pulled out, the plate frame 104 is inserted to rest on the supports within the cylinders 105 and 106.

[88] FIG. 8 is a perspective view showing a moving body coupled to a fixed body in an electrical fixture according to another embodiment of the present invention, FIG. 9 is a perspective view showing the moving body separated from the fixed body shown in FIG. 8, FIG. 10 is a perspective view showing the operation of the lamp post in FIG. 8, FIG. 11 is a phantom perspective view of a fixed arm head and a rotating arm head of the embodiment shown in FIG. 8, FIG. 12 is a phantom perspective view showing the fixed body and moving body in FIG. 8 in a coupled state, and FIG. 13 is a phantom perspective view showing the fixed body and moving body in FIG. 8 in a separated state.

[89] Referring to FIGS. 8 and 9, a lamp post 110 includes a post 111, a fixed arm 112 installed at the upper end of the post 111 pointing toward the street, a pivoting arm 113 installed at the lower portion of the fixed arm 112 to pivot with respect to the fixed arm 112, a lamp portion 114 installed at the end of the pivoting arm 113, a shock absorber

115 installed between the fixed arm 112 and the pivoting arm 113, and a supporting member 119 for supporting the fixed arm 112 against the post 111.

[90] Couplers for coupling the fixed arm 112 and the pivoting arm 113 are installed thereon, and couplers for coupling the pivoting arm 113 and the lamp portion 114 are installed thereon. Electrical wire for supplying electricity to a bulb installed in the lamp portion 114 is installed to extend from the bulb to the end of the pivoting arm 113, a winding device 117 for raising or lowering the lamp portion 114 to and from the pivoting arm 113 is installed at the lower end of the post 111, in order to wind or unwind wire on the winding device 117 to raise or lower the lamp portion 114. Also, a locking latch, for unlocking a locked state between the fixed arm 112 and the pivoting arm 113 (as described below) by unwinding or winding a wire, is installed at the bott om end of the post 111.

[91] FIG. 8 shows a lamp post that includes a lamp portion 114 with a lamp installed therein, a pivoting arm 113, and a fixed arm 112 coupled together. Here, the pivoting arm 113 and the fixed arm 112 are locked by means of a locking device, and an electrical plug of the lamp portion 114 contacts an electrical terminal of the pivoting arm 113.

[92] In FIG. 8, a locking latch is operated to unlock the locked state. When the wound wire 116 of the winding device 117 is unwound, the pivoting arm 113 is separated from the fixed arm 112 and pivots downward. Here, the shock absorber 115 restricts the separated distance of the pivoting arm 113. The shock absorber 115 has a cylinder 115b pivotably installed on the fixed arm 112, and a rod 115c connected at one end to the fixed arm 113 and inserted into the cylinder 115b at the other end. Here, the maximum extended distance of the rod 115c is when the pivoting arm 113 is perpendicular to the ground surface. Thus, the pivoting distance of the pivoting arm 113 is not only restricted by the shock absorber 115, but the pivoting arm 113 is prevented from suddenly pivoting and is made to move slowly by means of the shock absorber 115.

[93] When the pivoting arm 113 is disposed perpendicularly to the ground surface, the lamp portion 114 is separated from the end of the pivoting arm 113 through gravity and moves downward to assume the position shown in FIG. 9.

[94] The leading end of the wire 116 is wound on the winding device 117 as shown in

FIG. 10, and the trailing end is fixed to the pivoting arm 113. Installed between the leading and trailing ends of the wire 116 are a redirecting roller 121 installed at the connecting portion of the fixed arm 112, a roller 132 installed on a fixed arm contact portion 131 fixed to the end of the fixed arm 112, a roller 142 of a pivoting arm head 141 installed at the end of the fixed arm 113, and a roller 151 of the lamp 114. The roller 151 is a device that redirects the wire 116. One end of the wire 116 that contacts

the roller 151 is fixed to the winding device 117, and the other end is fixed to the pivoting arm 113, so that when the wire 116 wound around the winding device 117 is unwound, the roller 151 moves downward. Thus, the lamp portion 114, in which the roller 151 is installed, moves downward. When the wire 116 is wound onto the winding device 117, the roller 151 moves upward, so that the lamp portion 114 also moves upward.

[95] When the lamp portion 114 begins moving upward from its lowest position, because the wire 116 exerts an external force on the roller 142 in a horizontal direction, rotating force is exerted to pivot the pivoting arm 113. When the pivoting arm 113 pivots, the lamp portion 114 that is not coupled with the pivoting arm 113 swings in a wide arc so that a large twisting force and tension are exerted on the wire 116. Here, the shock absorber 115 is designed not to operate until an external force in excess of a predetermined level is imparted, so that the pivoting movement of the pivoting arm 113 is restricted. If the wire 116 is continuously wound, the lamp portion 114 is coupled to the end of the pivoting arm 113, and when a rotating force greater than the resistance of the shock absorber 115 is exerted on the pivoting arm 113, the pivoting arm 113 is pivoted. Accordingly, the shock absorber 115 performs the function of allowing the lamp portion 114 to be coupled to the end of the pivoting arm 113.

[96] The pivoting arm 113 is pivotably coupled to the fixed arm 112 by means of a hinge

118, and includes connecting members 191 and 192, and the pivoting arm head 141 installed on the ends of the connecting members 191 and 192.

[97] Also, the wires that protrude from the post 111 and the fixed arm 112 are fixed to a terminal connector 148 of the pivoting arm head 141 via the connecting members 191 and 192. Electrical wires connected to plugs 147b and 147b' contact the terminal connector 148.

[98] The pivoting arm head 141 has a housing 146 that can be inserted into the fixed arm head 131, and the roller 142, the terminal connector 148 for fixing wires, and a locking hole 145 (to which a locking device of the fixed arm head 141 is fastened) are installed inside the housing 146. A cylinder 155 is installed to protrude outward from a housing surface 146' that faces a ground surface when the pivoting arm 113 moves toward the ground surface. The housing of a fixed body 143 is screwed to the cylinder 155, and a fixed body socket 147 is installed at the end of the fixed body 143 housing.

[99] The fixed body socket 147 has through holes 147a and 147a' formed therein for guide rods 152 and 152' to pass through, and has the plugs 147b and 147b' protruding downward. Also, the plugs 147b and 147b' located within the fixed body socket 147 are electrically connected to the terminal connector 148.

[100] Referring to FIG. 11, a wire fixing member 160 is installed to the inside of the housing surface 146' to fix the terminal end of the wire 116. Here, the wire fixing

member 160 has an annular thrust bearing 144 installed thereon. The wire is passed through and fixed to the center of the thrust bearing 144. Here, the thrust bearing 144 prevents rotation and twist of the wire 116.

[101] The lamp portion 114 includes a lamp housing 157 with a bulb installed therein to radiate the light emitted by the bulb to the outside, and the moving body 154 that can be attached to and detached from the pivoting arm head 31 installed on the lamp housing 157.

[102] As shown in FIG. 11, the fixed arm contact portion 131 installed at the end of the fixed arm 112 is coupled with the pivoting arm head 141 of the pivoting arm 113. FIG. 11 shows the fixed arm contact portion 131 and the pivoting arm head 141 coupled together, with a locking pin 136 of the fixed arm contact portion 131 inserted in a locking hole 145 of the pivoting arm head 141. The locking hole 145 is a rectangular opening. The lower surface of the locking pin 136 is slanted and its upper surface is horizontally flat. Thus, when the locking pin 136 moves forward along the locking hole 145 and is inserted, the locking pin 136 does not move backward so that the fixed arm contact portion 131 and the pivoting arm head 141 do not separate. When the locking pin 136 receives pressure from a spring 134 installed in a locking pin installing frame 135 to move the locking pin 136 forward, the locking pin 136 is pulled by a locking wire 133 connected at the bottom of the post 111. Accordingly, in order to unlock the locked state, when the locking wire 133 at the bottom of the post 111 is pulled, the locking pin 136 is pulled out from the locking hole 145, and the pivoting arm head 141 is separated from the fixed arm contact portion 131.

[103] The moving body 154 installed on the lamp housing 157 is formed of the moving body housing 155 inserted over the fixed body 143 and the moving body socket 156 installed at the end of the moving body housing 155. The moving body socket 156 is either screwed or press-fitted to the end of the moving body housing 155. Also, guide rods 152 and 152' extending upward are installed on the top surface of the moving body socket 156, and a roller 152 is installed on the lower surface thereof. Plugs 37b and 37b' and contact terminals 153 and 153' are installed on the upper surface.

[104] As shown in FIG. 12, the wire 116 enters the guide rod 152, passes the roller 151, and exits the guide rod 152'. Here, the wire 116 is maximally wound. At this point, the moving body 155 is inserted over the fixed body 143, the plugs 147b and 147b' are inserted in the terminals 153 and 153', and the guide rods 152 and 152' are inserted in the through holes 147a and 147a' to protrude maximally.

[105] When the wire 116 is unwound from the state in FIG. 12, the guide rods 152 and

152' are guided in the through holes 147a and 147a' to move downward, whereupon the terminals are separated from the plugs. Here, the moving body 155 is separated from the fixed body 143 and moves downward, so that the state shown in FIG. 13 is

realized.