BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates in general to umbrella type foldable tents and, more particularly, to an improved structure in such foldable tents for facilitating the pitching and the striking thereof.

Description of the Prior Art

With reference to Fig. 1, there is shown a conventional foldable tent which is disclosed in Korean Utility Model Publication No. 89-2477. The foldable tent is pitched or struck by extending or folding a plurality of pipe flames 1 connected to each other by a plurality of joints 2. When pitching the foldable tent, the user manually extends all the pipe frames 1 by strongly biasing the joints 2. However, as the tensile force of the cloth tent body becomes stronger in accordance with extending of the pipe frames 1, the user needs to exert all his strength when extending the last frame 1 or biasing the last joint 2. This makes the pitching of the foldable tent very difficulty.

In order to facilitate the pitching of the above foldable tent, the pipe frames 1 is preferably made of an excellent flexible material. However, the above flexible material does not provide pipe frames of a good resilience, which frames should be used along with the foldable tent. That is, the pipe frames 1 made of the above flexible material do not achieve a desired stretch of the cloth tent body when the tent is in pitched state. In addition, when striking the foldable tent, the user should bias the first joint while exert all his strength exceeding the tensile force of the tent body, This may cause break or trouble of the pipe frame 1 or of the joint 2.

Turning to Fig. 2, there is shown a conventional foldable tent which is disclosed in Korean Utility Model

Publication No. 91-1106. When pitching this foldable tent, a center rope 3 is pulled down while gripping a center member 4 in the same manner as opening a conventional umbrella, thus to move the center member 4 upward until the top section of the member 4 is locked to a locking cap 6. When striking the tent, a release button 7 of the locking cap 6 is pushed so as to elastically separate the top section of the center member 4 from the locking cap 6.

In the above foldable tend of Fig. 2, a desired stretch of the pitched tent is achieved only when the foldable ribs 5 coupled to the center member 4 are nearly horizontally stretched as shown at the dotted line of Fig. 2. In this case, the cloth tent body is provided with the maximum tensile force and achieves the desired stretch. However, in order to lock the center member 4 to the locking cap 6 when pitching the tent, the ribs 5 coupled to the center member 4 should pass over the desired horizontal position as shown at the solid line of Fig. 2. The cloth tent body is thus not provided with the desired tensile force even when fully pitched. In this regard, the foldable tent of Fig. 2 achieves no desired stretch of the cloth tent body when pitched. There is thus formed space between the tent body and the pipe frames. Since the cloth tent body has no desired stretch as described above, it should flutter in the wind. When pushing the release button 7 so as to strike the tent, the user should push or handle the button 7 with his hand fully stretched. However, the user can not exert all his strength with his hand fully stretched as described above so that the pitched tent should be provided with deficient stretch which allows the tent to be struck with the deficient user's strength caused by the fully stretched hand. Another problem of the foldable tent of Fig. 2 is resided in that the tent size should be limited since the fully stretched user's hand should reach the locking cap 6 of the pitched tent in order to push or handle the release button 7.

SUMMARY OF THE INVENTION

It is, therefore, an object of the present invention to provide a foldable tent in which the aforementioned problems of the conventional foldable tents can be overcome and which achieves the desired stretch of the cloth tent body when fully pitched.

It is another object of the present invention to provide a foldable tent which is easily pitched and struck regardless of tent size.

It is still another object of the present invention to provide a foldable tent of which the pipe frames can be easily repaired when they are troubled in accordance with long time use. In order to accomplish the above objects, a foldable tent in accordance with the present invention comprises: a cloth tent body; a plurality of foldable pipe frames coupled to each other at their inside ends and extended so as to pitch the tent, each the pipe frame comprising a plurality of pipes jointed to each other by a plurality of joints; a cylindrical center member coupled to all the inside ends of the pipe frames at its top end, the center member including a top cylinder and a bottom cylinder, the top cylinder being coupled to the pipe frames and having a through hole and the bottom cylinder being detachably coupled to the bottom end of the top cylinder; a cylindrical slider ovably fitted over the center member such that it slides along the center member, the slider having a notch on its inner surface; an elastic locking member mounted in the top cylinder of the center member for locking the slider, the locking member having a locking projection elastically penetrating the through hole of the top cylinder so as to snap into the notch of the slider and to retain pitched state of the tent; means for releasing the locking projection of the locking member from the notch of the slider for folding the pipe frames, the releasing means being received in the bottom cylinder; and a plurality of ribs, each the rib being hinged

to a corresponding pipe frame and the slider at its opposed ends such that an angle formed between it and the top cylinder when pitching the tent is less than 90".

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a perspective view of a pitched foldable tent in accordance with an embodiment of the prior art;

Fig. 2 is a side view of framework of a pitched foldable tent in accordance with another embodiment of the prior art;

Fig. 3 is a side sectional view of a framework of a pitched foldable tent in accordance with a primary embodiment of the present invention;

Fig. 4 is a side view of the framework of Fig. 3 in which a bottom cylinder is separated and removed from a center member;

Fig. 5 is an enlarged sectional view showing construction of the center member and a slider of the framework of Fig. 2, the slider being locked to a top cylinder of the center member;

Fig. 6 is a view corresponding to Fig. 5, but showing the slider being separated from the top cylinder prior to its descending and in turn placed about the bottom cylinder;

Fig. 7 is sectional view showing the top cylinder and the bottom cylinder of the framework of Fig. 2 separated from each other;

Fig. 8 is a sectional view of a center member of a tent framework in accordance with another embodiment of the present invention; and Fig. 9 is an enlarged sectional view of the circled section A of Fig. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to Fig. 3, there is shown in a side sectional view a framework of a pitched foldable tent in accordance with a primary embodiment of the present invention. In the foldable tent of the primary embodiment, the foldable ribs are designated by the numeral 13. Each of the foldable ribs 13 is pined to a slider 12 at one end thereof. The other end of each foldable rib 13 is pined to a corresponding rib fixture 14 fixed to a top section of a pipe frame 15. The slider 12 is movably fitted over a cylindrical center member 11 such that it vertically slidably reciprocates along the center member 11. As shown at the solid line of this drawing, the slider 12 ascends along the center member 11 and is locked to a top section of the center member 11 as will be described later herein, thus to firmly retain the pitched state of the tent. When striking the tent or folding the framework of the tent, the slider 12 is separated from the top section of the center member 11 and descends along the center member 11. The slider 12 in turn is placed about the bottom section of the center member as will be described later herein. The folded pipe frame 15 is shown at the dotted line of Fig. 3.

Fig. 4 is a side view of the framework of Fig. 3 in which the bottom section of the center member is separated and removed from the top section of the center member. The above separation of the bottom section is carried out for preventing the bottom section from causing an obstacle in the space of the pitched tent. The relative position between the slider 12 and the center member 11 is represented in detail in Figs. 5 and 6.

As shown in Figs. 5 and 6, the cylindrical center member 11 comprises the top section or a top cylinder 11a and the bottom section or a bottom cylinder lib. The top and bottom cylinders 11a and lib of the center member 11 are detachably coupled to each other by screw type coupling. In the top cylinder 11a, an elastic locking member 17 having a

pair of projections 17a is pined to the inner surface of the top cylinder 11a by a pin 25 such that its position with respect to the top cylinder 11a is fixed. The reversed V- shaped locking member 17 is made of an elastic material and biased outward at its opposed blades as shown at the arrow of Fig. 5 due to its intrinsic elasticity. Since the blades of the locking member 17 are elastically biased outward, the projections 17a of the blades of the locking member 17 penetrate opposed through holes 29 of the top cylinder 11a so as to be exposed to the outside of the cylinder 11a respectively. The bottom cylinder lib receives therein a cylindrical piston 18, a connection rod 19 coupled to the piston 18 and a spring compression plate 21 fixed to the connection rod 19. The bottom cylinder lib further received therein a connection rod stop member or a coil spring 20 for stopping descending of the connection rod 19. The free end of the connection rod 19, which end is vertically exposed to the outside of the bottom cylinder lib, is provided with a release button 22. The lower end of the bottom cylinder lib is closed by a bottom plate 24. The coil spring 20 is placed over the connection rod 19 between a spring stop plate 23 and the spring compression plate 21 in the bottom cylinder lib. As the bottom cylinder shows a circular profile when cross sectioned, the spring stop plate 23, the spring compression plate 21, the coil spring 20 and the release button 22 have their circular profiles. In order to receive the connection rod 19, the bottom plate 24 has a center through hole. The detachable coupling of the top cylinder 11a to the bottom cylinder lib is achieved by screw type fitting of the inner threaded end of the top cylinder 11a to the outer threaded end of the bottom cylinder lib. The slider 12 is provided on its inner surface with a pair of notches 12a for elastically receiving the projections 17a of the blades of the locking member 17. This slider 12 is movably fitted over the center member 11 comprising the top cylinder 11a and the bottom cylinder lib. The slider 12 thus vertically slidably reciprocates along the center

member 11. The connection rod 19 is provided with a stopper 26 on its lower section for limiting the descending distance of the connection rod 19.

Each of the foldable ribs 13 is pined to the top section of the slider 12 at one end thereof. The other end of each foldable rib 13 is pined to the corresponding rib fixture 14 of the top section of the pipe frame 15 as shown in Figs. 3 and 4. Here, the foldable ribs 13 are pined to the top cylinder 11a such that the angle α formed between each rib 13 and the outer surface of the top cylinder 11a when pitching the foldable tent is less than 90" as shown in Fig. 5.

Turning to Fig. 8, there is shown a center member of a tent framework in accordance with another embodiment of the present invention. In this another embodiment, one end of the connection rod 19 is hinged to the cylindrical piston 18 by a pin 31. The other end of the connection rod 19 is hinged to a rink 34 by a pin.

The opposed ends of the link 34 having a slot are hinged to the other end of the connection rod 19 and one end of a release lever 32 respectively such that it is moved as shown at the arrows of Fig. 8. The one end of the release lever 32 penetrates a side through hole 37 formed in the lower section of the bottom cylinder lib and in turn is hinged to the link 34. The other end of the release lever 34 is hinged to the side wall of the bottom cylinder lib. In order to provide a restoring force for the release lever 32, a compression coil spring 35 is placed between the outer surface of the bottom cylinder lib and the release lever 32. Fig. 9 shows a screw type coupling of the frame 15 in accordance with the present invention. In this case, the frame 15 can be disassembled.

Hereinbelow, the operational effect of the top cylinder 11a, the bottom cylinder lib and the slider 12 will be given.

In order to pitch the foldable tent, the slider 12 is manually pushed up as shown at the arrow of Fig. 6 while

tightly gripping the bottom cylinder lib of the center member 11. The ascending of the slider 12 along the center member 11 is continued until the projections 17a of the elastic locking member 17 snap into the notches 12a of the slider 12. When the projections 17a snap into the notches 12a of the slider 12, the slider 12 is locked to the top cylinder 11a as shown in Fig. 5 and finishes the pitching of the foldable tent.

Here, in order to maximize the stretch of the cloth tent body, the foldable ribs 13 are pined to the top cylinder 11a such that the angle α formed between each rib 13 and the outer surface of the top cylinder 11a when pitching the foldable tent is less than 90" as shown in Fig. 5. When the bottom cylinder lib remains in the tent after finishing the pitching of the tent, it may cause substantial inconvenience in use of the pitched tent such as causing user's head collision. In order to prevent the inconvenience caused by the bottom cylinder lib, the bottom cylinder lib is separated and removed from the top cylinder 11a as shown in Fig. 7. The foldable tent with the bottom cylinder lib separated and removed from the top cylinder 11a in practical use is shown in Fig. 4.

In order to strike the foldable tent or to fold the framework of the tent, the bottom cylinder lib is coupled to the top cylinder by screw type fitting as shown in Fig. 5. The release button 22 is, thereafter, pushed up so that the connection rod 19 is moved up while compressing the compression coil spring 20 by the spring compression plate 21. As a result of upward movement of the connection rod 19, the cylindrical piston 18 is moved upward so as to bias inward the blades of the elastic locking member 17. The diverged elastic blades of the reversed V-shaped locking member 17 are thus puckered so as to make their projections 17a free from the notches 12a of the slider 12 and retracted into the through holes 29 of the top cylinder 11a. The slider 12 thus slidably descends along the top cylinder 11a

due to its own weight and gets out of the top cylinder 11a as shown in Fig. 6. Thereafter, the pushing force applied to the release button 22 is removed from the button 22 so that the connection rod 19 elastically descends due to the restoring force of the compression coil spring 20 until the stopper 26 of the rod 19 comes into contact with the inner surface of the bottom plate 24 of the bottom cylinder lib. As a result of the above descending of the connection rod 19, the cylindrical piston 18 releases the elastic locking member 17 so that the blades of the member 17 are elastically opened. The projections 17a of the locking member 17 thus penetrates the through holes 29 of the top cylinder 11a so as to be exposed to the outside of the top cylinder 11a. In the embodiment of Fig. 8, the link 34 ascends under the guide of a guide pin 33 and makes both the connection rod 19 and the cylindrical piston 18 ascending in the center member 11. The projections 17a of the locking member 17 is free from the notches 12a of the slider 12. As shown in the enlarged view of the circled section B of Fig. 8, the top end of the connection rod 19 is hinged to the bottom of the piston 18 so that the link 34 moves under the guide of the guide pin 33 and the cylindrical piston 18 vertically smoothly reciprocates in the center member 11 even when the piston 18 is eccentric from the connection rod 19.

As described above, the foldable ribs of the tent framework of this invention are pined to a top cylinder of a center member such that the angle α formed between each rib and the outer surface of the top cylinder when pitching the foldable tent is less than 90°. In this regard, the ribs withstand the force applied from the cloth tent body thereto and increase the stretch of the cloth tent body when pitching the tent unlike the prior art foldable tents. The framework of the foldable tent of this invention thus retains the fully stretched cloth tent body. The foldable tent of this invention is easily pitched or struck by simply lock or release the slider to or from the center member in

the same manner as pitching or folding a conventional umbrella.

When the frame and/or its joints are partially broken or troubled due to long time use, the broken or troubled part of the frame is easily removed from the frame by releasing the screw type coupling section and substituted with new one. In this regard, the foldable tent of this invention can be used for a long time. Another advantage of the present invention is resided in that unlike the prior art foldable tents, the user does not need to stretch his hand so as to push or handle the release button placed on the dome center of the pitched tent in striking the tent or folding the tent framework. In this regard, the foldable tent of this invention is easily pitched and struck regardless of its size and, as a result, not limited in its size.

Of course, it should be understood that the detachable coupling of the top cylinder to the bottom cylinder of the center member may be achieved by another method other than the aforementioned screw type coupling.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.