Description A DOOR LOCK DEVICE

Technical Field

[1] The present invention relates to a door lock device, and more particularly, to a door lock device for locking and unlocking a door. Background Art

[2] In general, door lock devices are widely used in general houses and public buildings. Typically, the door lock devices are used in front doors, safes in banks, or entrance control systems for restricting entrance to specified regions.

[3] FIG. 1 shows a conventional door lock device 100 . Referring to FIG. 1, the door lock device 100 includes a case 10 inserted into a door 1, and a deadbolt 20 and a latchbolt 30, which are installed in the case 10. The deadbolt 20 and the latchbolt 30 are installed in the case 10 to effect rectilinear movement in a reciprocal direction with respect to the case 10 to be inserted into or separated from a deadbolt insertion hole (not shown) and a latchbolt insertion hole (not shown) formed in a doorpost (not shown). In addition, the latchbolt is resiliently biased by a compression coil spring (not shown) in a direction projecting from the case 10. Further, a motor (not shown) is installed in the case 10 to drive the deadbolt 20, and a keypad (not shown) including a plurality of keys is installed at an outer surface of the door 1 to output a drive signal for driving the motor.

[4] Meanwhile, the door lock device 100 includes detection means for detecting a closed state of the door 1. The detection means includes an insertion/projection member 40 installed between a projection position shown by an imaginary line in FIG. 1 and an insertion position shown by an imaginary line in FIG. 1 to effect rectilinear movement, and a photo sensor (not shown) for detecting the insertion/projection member when the insertion/projection member is located at the insertion position. In addition, the insertion/projection member 40 is resiliently biased by a spring (not shown) installed in the case toward the projection position. Therefore, when the door is closed, the insertion/projection member 40 is pressed by the doorpost to move to the insertion position. The insertion/projection member is then detected by a detector so that the closed state of the door is indirectly detected. Further, when the detector detects the insertion/projection member, a detection signal corresponding thereto is output to a controller (not shown).

[5] The controller (not shown) recognizes a closed state and an open state of the door depending on whether or not the detection signal is input. In addition, the controller can be connected to a security service company so that information of an open state of

the door is transmitted to the security service company to require emergency measures of the security service company when an invader opens the door during a long-term leave or at night.

[6] However, in the door lock device 100 as described above, in the case that the door is forcefully opened from the exterior of the door, if the invader pushes the insertion/ projection member 40 manually or using a tool, the insertion/projection member 40 may be located at the insertion position at all times. As described above, if the insertion/projection member 40 is continuously located at the insertion position by the invader, even though the door has been illegally opened, the controller may misconceive that the door is closed. That is, even though the invader has opened the door 1, the controller misconceives the state of the door, thereby incapacitating the security service company. Disclosure of Invention Technical Problem

[7] In order to solve the foregoing and/or other problems, it is an object of the present invention to provide an improved door lock device capable of always detecting an open state of a door in a case that the door is open. Technical Solution

[8] One aspect of the present invention provides a door lock device including: a case coupled to a door; a deadbolt installed in the case to lock or unlock the door; a latchbolt installed in the case to move rectilinearly in a reciprocal direction with respect to the case to be inserted into or separated from a latchbolt insertion hole formed in a doorpost, and having a through-hole with one open side; and detection means for detecting a closed state of the door in which the latchbolt is inserted into the latchbolt insertion hole to close the door, wherein the detection means includes: a movable member inserted into the through-hole to move rectilinearly with respect to the latchbolt in the same direction as a movement direction of the latchbolt, and disposed to be inserted into an end of the latchbolt in a state that the door is closed; and a resilient member for resiliently biasing the movable member in a direction projecting from the latchbolt.

Advantageous Effects

[9] In accordance with the present invention, when the door is opened by an invader, a light receiving diode cannot detect light to detect an open state of the door such that a detection signal corresponding to the open state of the door is transmitted to a security service company, thereby improving security of the door lock device in comparison with the conventional art. That is, it is possible to securely detect the open state of the door whenever the door is open.

Brief Description of the Drawings

[10] These and/or other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of exemplary embodiments of the invention, taken in conjunction with the accompanying drawings of which:

[11] FIG. 1 is a schematic perspective view of a conventional door lock device;

[12] FIG. 2 is a schematic partial cross-sectional view of a door lock device in accordance with a first exemplary embodiment of the present invention;

[13] FIG. 3 is a schematic cross-sectional view taken along line III- III of FIG. 2;

[14] FIG. 4 is a schematic cross-sectional view of the door lock device of FIG. 3, a door being opened;

[15] FIG. 5 is a schematic partial cross-sectional view of a door lock device in accordance with a second exemplary embodiment of the present invention;

[16] FIG. 6 is a partial cross-sectional view of the door lock device of FIG. 5, a door being opened;

[17] FIG. 7 is a projection view of the door lock device, when seen from line VII-VII direction of FIG. 5;

[18] FIG. 8 is a schematic partial cross-sectional view of a door lock device in accordance with a third exemplary embodiment of the present invention;

[19] FIG. 9 is a schematic partial cross-sectional view of the door lock device of FIG. 8, a door being opened; and

[20] FIG. 10 is a projection view of the door lock device, when seen from line X-X direction of FIG. 8. Mode for the Invention

[21] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings, throughout which like reference numerals refer to like elements.

[22] Referring to FIGS. 2 to 4, similar to the conventional door lock device 100 of FIG.

1, a door lock device 100 in accordance with an exemplary embodiment of the present invention includes a case 10 coupled to a door 1, a deadbolt 20 installed in the case 10 to lock and unlock the door 1, and a latchbolt 30 installed in the case 10 to effect rectilinear movement in a reciprocal direction with respect to the case 10 to be inserted into and separated from a latchbolt insertion hole 3 formed in a doorpost 2. In addition, the door lock device 100 of the exemplary embodiment also includes detection means for detecting a closed state of the door 1 when the latchbolt 30 is inserted into the latchbolt insertion hole 3 and the door 1 is closed. Also the latchbolt 30 is resiliently biased by a compression coil spring (not shown) in a direction projecting from the case

10.

[23] In contrast to the conventional door lock device 100 described with reference to

FIG. 1, in the door lock device 100 of the exemplary embodiment, the detection means is configured to always detect an open state of the door 1 when the door 1 is illegally opened by an invader.

[24] That is, the detection means of the door lock device 100 of the exemplary embodiment includes a projection member 40, a movable member 50, and a position detector 60, unlike the conventional door lock device 100 .

[25] The projection member 40 is coupled to the latchbolt insertion hole 3 formed in the doorpost. The projection member 40 is disposed to project from an inner surface of the latchbolt insertion hole 3. At least a portion of the projection member 40 is disposed in a through-hole 31 as shown in FIG. 4 when the door 1 is closed. Here, the through-hole 31 is formed in the latchbolt 30 to be opened at its one side, and a central axis direction of the through-hole 31 is the same as a rectilinear movement direction of the latchbolt 30. A tip surface of the projection member 40 is sloped.

[26] The movable member 50 is inserted into the through-hole 31 of the latchbolt. The movable member 50 is installed at the latchbolt to effect rectilinear movement in the same direction as a movement direction of the latchbolt. The movable member 50 includes a contact part 51, a shaft part 52, and a stopper part 53.

[27] The contact part 51 is inserted into the through-hole 31 to move rectilinearly in the through-hole 31. As shown in FIG. 4, the contact part 51 has a smoothly curved tip such that the tip of the contact part 51 is smoothly connected to a curved surface formed at the tip of the latchbolt 30.

[28] The shaft part 52 is connected to the contact part 51, and elongated in a movement direction of the contact part 51. A portion of the shaft part 52 is disposed in the through-hole 31.

[29] The stopper part 53 projects from an outer periphery of the shaft part 52. In this exemplary embodiment, the stopper part 53 is separately formed from the movable member 50 to be adhered to the shaft member 52 of the movable member 50. As shown in FIG. 4, the stopper part 53 is hooked by the latchbolt 30 when the door 1 is open, to prevent separation of the movable member 50 from the through-hole 31.

[30] In particular, in this exemplary embodiment, since the stopper part 53 is coupled to the movable member 50, when the latchbolt 30 moves in a direction entering the case 10, the stopper part 53 is pressed by the latchbolt 30. As a result, the movable member 50 moves rectilinearly in a direction entering the case 10 together with the latchbolt 30 after the pressing.

[31] In addition, the movable member 50 is resiliently biased by a resilient member, for example, a compression coil spring 54 from a contact position toward a contact release

position. In this exemplary embodiment, as shown in FIG. 3, the compression coil spring 54 is inserted into the through-hole 31. In particular, one end of the compression coil spring 54 is in contact with the contact part 51 of the movable member, and the other end of the compression coil spring 54 is in contact with an inner surface of the through-hole 31.

[32] The movable member 50 can be located between a contact release position and a contact position.

[33] Since the movable member 50 is not in contact with the projection member 40 and not to be pressed by the projection member 40 in a state that the door 1 is open, as shown in FIG. 4, the movable member 50 is located at the contact release position.

[34] Meanwhile, when the door 1 is closed, the latchbolt 30 is pressed by the doorpost 2 to move in a direction entering the case 10 while the door 1 is closed. At this time, the movable member 50 also moves together with the latchbolt 30. Then, at the moment the door 1 is completely closed, the latchbolt 30, which was resiliently biased in a direction projecting from the case 10, moves in the projection direction to be inserted into the latchbolt insertion hole 3. At this time, the movable member 50 also moves rectilinearly in the projection direction of the latchbolt 30 to some extent, but, as shown in FIG. 3, finally, the movable member 50 is in contact with the projection member 40. That is, the movable member 50 is located at the contact position where the contact part 51 of the movable member 50 is in contact with the projection member 40. In addition, at the contact position, the contact part of the movable member is inserted into an end of the latchbolt 30.

[35] The position detector 60 detects the movable member 50 when the movable member 50 is located at the contact position. The position detector 60 may be formed by various means, and in particular, in this exemplary embodiment, the position detector 60 is constituted by a photo sensor including a light emitting diode 61 and a light receiving diode 62, which is well known in the art. The light emitting diode 61 is installed at the shaft part 52 of the movable member 50, and the light receiving diode 62 is installed at the latchbolt 30. Since the position detector 60 is configured to include the light emitting diode 61 and the light receiving diode 62, as shown in FIG. 4, in a state that the door 1 is open, the light receiving diode 62 cannot detect light from the light emitting diode 61. However, when the door 1 is closed as shown in FIG. 3, the light receiving diode 62 can detect light from the light emitting diode 61. Therefore, it is possible to determine whether the door 1 is open or closed depending on detection of light by the light receiving diode 62.

[36] As described above, in the door lock device 100 of the exemplary embodiment, when the door 1 is closed from a state that the door 1 is open as shown in FIG. 4, the latchbolt 30 and the movable member 50 move together in the direction entering the

case 10 while the door is closed. Then, at the moment the door 1 is completely closed and the latchbolt 30 is inserted into the latchbolt insertion hole 3, the latchbolt 30 moves in the direction projecting from the case 10 to be inserted into the latchbolt insertion hole 3. In addition, the movable member 50 moves in the direction projecting from the case 10 to be in contact with the projection member 40 so that the movable member 50 is maintained at the contact position as shown in FIG. 3. As described above, in a state that the movable member 50 is located at the contact position, the light receiving diode 62 detects light from the light emitting diode 61 so that a closed state of the door 1 is detected.

[37] In addition, in this exemplary embodiment, since the movable member 50 is re- siliently biased by a resilient force of the compression coil spring 54 in the direction of the contact release position, when an invader opens the door 1, the movable member 50 moves rectilinearly in a direction projecting from the case 10 to be located at the contact release position where the movable member 50 is not in contact with the projection member 40. When the movable member 50 is located at the contact release position as described above, the light receiving diode 62 cannot detect light to determine that the door 1 is open. Therefore, in this exemplary embodiment, unlike the conventional art, when the door 1 is opened by the invader, the light receiving diode 62 cannot detect light to determine the open state of the door so that a detection signal corresponding to the open state of the door is transmitted to a security service company, thereby improving security of the door lock device in comparison with the conventional art.

[38] Meanwhile, referring to FIGS. 5 to 7, a door lock device 100a in accordance with a second exemplary embodiment of the present invention includes a case 10, a deadbolt 20, a latchbolt 30, and detection means, similar to the door lock device 100 of the first exemplary embodiment. In addition, the detection means includes a projection member 40, a movable member 50a, a compression coil spring 54, a movable cross member 70, and a position detector 60a.

[39] The movable member 50a has a sloped part 55 sloped in a movement direction of the movable member 50a.

[40] The movable cross member 70 has an elongated hole 71 formed in a movement direction of the movable cross member 70. A fixing pin 72 is inserted through the elongated hole 71 to be fixed to the latchbolt 30. As described above, since the movable cross member 70 is fixed to the latchbolt 30 by the fixing pin 72, the movable cross member 70 can move rectilinearly together with the latch bolt 30 in the same direction as the movement direction of the latchbolt 30 when the latchbolt 30 moves rectilinearly.

[41] In addition, the movable cross member 70 is installed in the case 10 to effect

rectilinear movement in a direction crossing the movement direction of the movable member 50, i.e., in a direction perpendicular to the movement direction of the movable member 50. Further, rectilinear movement of the movable cross member 70 is guided by the fixing pin 72 and the elongated hole 71. Furthermore, the movable cross member 70 is resiliently biased by a resilient member, for example, a compression coil spring 73 inserted into the elongated hole 72 from a moved position to a normal position, which will be described later, i.e., in a downward direction. One side of the compression coil spring 73 is in contact with the fixing pin 72, and the other side of the compression coil spring 73 is in contact with an inner surface of the elongated hole 71.

[42] The movable cross member 70 may be alternatively positioned between the normal position shown in FIG. 6 and the moved position shown in FIG. 5.

[43] When the door 1 is open, since the movable member 50 is located at the contact release position, the movable cross member 70 is located at the normal position where the movable cross member 70 is not pressed by the movable member 50.

[44] Meanwhile, when the door 1 is closed, the latchbolt 30 and the movable member 50 move rectilinearly as shown in the first exemplary embodiment. In addition, in a process in which the latchbolt 30 and the movable member 50 move in a direction entering the case 10 and then move in a direction projecting from the case 10, that is, in a process in which the latchbolt 30 is inserted into the latchbolt insertion hole 3 and simultaneously the movable member 50 is in contact with the projection member 40, the movable cross member 70 is pressed by the movable member 50 to move upward rectilinearly from the normal position to be located at the moved position.

[45] In particular, in this exemplary embodiment, since the movable cross member 70 has a taper part 74 sloped in the same direction as the slope direction of the sloped part 55 of the movable member 50, when the movable member 50 is located at the contact position, the taper part 74 is pressed by the sloped part 55 to be relatively slid with respect to the sloped part 55 so that the movable cross member 70 can be moved upward.

[46] The position detector 60a detects the movable cross member 70 upon movement of the movable cross member 70 to the moved position. The position detector 60a may be formed by various means, and in particular, in this exemplary embodiment, the position detector 60a is constituted by a photo sensor including a light emitting diode 61a fixed to one side of the movable cross member 70 and a light receiving diode 62a fixed to the case 10 to detect light from the light emitting diode 61a when the movable cross member 70 is located at the moved position. Meanwhile, as shown by an imaginary line in FIGS. 5 and 6, the position detector 60a may be constituted by a touch sensor. In this case, when the movable cross member 70 is located at the moved position and touches the touch sensor, a closed state of the door 1 is detected. As

described above, in this exemplary embodiment, the position detector 60a detects the moved position of the movable cross member 70 to indirectly determine the closed state of the door 1.

[47] In addition, referring to FIGS. 8 to 10, a door lock device 100b of a third exemplary embodiment also includes a case 10, a deadbolt 20, a latchbolt 30, and detection means, similar to the door lock device 100 of the first exemplary embodiment. Further, the detection means includes a projection member 40, a movable member 50, a compression coil spring 54, a rotary member 80, and a position detector 60b.

[48] The rotary member 80 is rotatably installed in the case 10. A hinge pin 81 is inserted into the rotary member 80 such that the rotary member 80 can be rotated about a rotation center of the hinge pin 81. The hinge pin 81 is fixed to the latchbolt 30. As described above, since the rotary member 80 is fixed to the latchbolt 30 by the hinge pin 81, the rotary member 80 can be moved rectilinearly together with the latchbolt 30 in the same direction as the movement direction of the latchbolt 30 upon rectilinear movement of the latchbolt 30. In addition, the rotary member 80 is resiliently biased by a resilient member, for example, a compression coil spring 82 from a rotated position toward a normal position, which will be described later. That is, the rotary member 80 is resiliently biased to rotate toward the normal position. One side of the compression coil spring 82 is in contact with the rotary member 80, and the other side of the compression coil spring 82 is in contact with a projection 32 projecting from the latchbolt 30.

[49] The rotary member 80 is rotatable between the normal position shown in FIG. 9 and the rotated position shown in FIG. 8.

[50] When the door 1 is open, since the movable member 50 is located at the contact release position, the rotary member 80 is located at the normal position where the rotary member 80 is not pressed by the movable member 50.

[51] Meanwhile, when the door 1 is closed, as described in the first exemplary embodiment, the latchbolt 30 and the movable member 50 move rectilinearly. In addition, in a process in which the latchbolt 30 and the movable member 50 move in a direction entering the case 10 and then move in a direction projecting from the case 10, that is, in a process in which the latchbolt 30 is inserted into the latchbolt insertion hole 3 and simultaneously the movable member 50 is in contact with the projection member 40, the rotary member 80 is pressed by the movable member 50 to be rotated from the normal position to be located at the rotated position.

[52] The position detector 60b detects the rotary member 80 upon rotation of the rotary member 80 to the rotated position. The position detector 60b may be formed by various means, and in particular, in this exemplary embodiment, the position detector 60b is constituted by a photo sensor including a light emitting diode 61b fixed to one

side of the rotary member 80 and a light receiving diode 62b fixed to the case 10 to detect light from the light emitting diode 61b when the rotary member 80 is located at the rotated position. Meanwhile, as shown by an imaginary line in FIGS. 8 and 9, the position detector 60b may be constituted by a touch sensor. In this case, when the rotary member 80 is located at the rotated position to touch the touch sensor, a closed state of the door 1 is detected. As described above, in this exemplary embodiment, the position detector 60b detects the rotated position of the rotary member 80 to indirectly determine the closed state of the door 1.

[53] While few exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes may be made to these exemplary embodiments without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

[54] For example, in this exemplary embodiment, while the deadbolt is installed to effect rectilinear movement, the deadbolt may be rotatably installed. In addition, as is well known, the door may be configured to be locked or unlocked by applying a magnetic field around the deadbolt or not in a state that the deadbolt is fixed to the door.

[55] In addition, in this exemplary embodiment, while the tip surface of the projection member is sloped and the contact part of the movable member has a curved surface, bo th the tip surface of the projection member and the contact part of the movable member may have a flat surface.

[56] Further, in this exemplary embodiment, while the position detector is formed of a touch sensor or a photo sensor, but not limited thereto, may be formed by various means.

[57]