Joint fitting

Abstract

The present invention is intended to achieve the above-mentioned object, and the means of claim 1 is a joint fitting comprising: a top plate base attached to an underside of a top plate; a leg base attached to a leg supporting said top plat e; a hinge pin capable of pivotally supporting and swinging said top plate base and said leg base; a lock pin that inserted into a long hole provided in said to p plate base capable of locking said top plate base and said leg base; a lever f or operating said lock pin; a lever pin that inserted into said top plate base c apable of pivotally supporting and swinging said lever; a spring in which both e nds are wound on said lock pin and said hinge pin; said lock pin is inserted int o a lock pin hole provided in said lever; when said top plate and said legs are in open position and locked state, said lock pin engages with a first notch prov ided in said leg base; when said top plate and said legs are in close position a nd locked state, said lock pin engages with a second notch provided in said leg base; and when said top plate and said legs are in unlocked state, a trigger mov ed linearly and supported by a bracket attached to said top plate base locks sai d lever.

Description

[Technical Field]

[0001] The present invention relates to articulating fittings for legs of a foldable ta ble.[Background Art]

[0002] A table may have a structure that allows it to be folded, assuming that it is st ored when not in use. The table, which has the structure in which the top plate is folded vertically, has various functions according to the storage form, such as tilting one top plate or tilting the top plates so as to separate and face ea ch other. On the other hand, the table having the structure in which the legs ar e folded also has various functions such as folding the legs one by one or foldi ng the plurality of legs in conjunction with each other.

[0003] For the tables with the foldable structure, it is important to fix the top plate or legs during use. If the top plate or legs are unintentionally folded during use, not only will the articles placed on the top plate be scattered, but there is a risk of causing an injury to the user.

[0004] As a mechanism for folding the legs, a joint fitting that prevents the legs from unsteadiness, and enables the legs to be closed and opened in a stable state an d the locking state to be easily released is disclosed (cf Patent Document 1).

[0005] The applicant improved the joint fitting disclosed in Patent Document 1, and dis closed an joint fitting with an auxiliary structure that can minimize the unstea diness as much as possible while following the superior operability of the locki ng mechanism involving crossbeams, notch sections, and long holes (cf Patent Do cument 2).[Description of the Prior Art][Patent Documents]

[0006] [Patent Document 1] Japanese Utility Model Registration Publication No. 3055557 [Patent Document 2] WO 2023 / 230310 [Disclosure of the Invention][Problems to be Solved by the Invention]

[0007] The joint fitting disclosed in Patent Document 2 is characterized by the operabi lity of the locking mechanism, and it is easy to switch between the locked state and the unlocked state. However, since the lever that operates the locking mech anism is not configuration to be lockable, there is a problem of the lever movin g unintentionally when the legs are opened or closed.

[0008] Therefore, an object of the present invention is to provide the joint fitting ha ving the mechanism for locking the lever to switch between the locked state and the unlocked state, and the lever that enables to be locked when the leg is open ed and closed.[Means for solving the problem]

[0009] That is, the present invention is intended to achieve the above-mentioned object , and the means of claim 1 is a joint fitting comprising: a top plate base attac hed to an underside of a top plate; a leg base attached to a leg supporting said top plate; a hinge pin capable of pivotally supporting and swinging said top pl ate base and said leg base; a lock pin that inserted into a long hole provided i n said top plate base capable of locking said top plate base and said leg base; a lever for operating said lock pin; a lever pin that inserted into said top pla te base capable of pivotally supporting and swinging said lever; a spring in whi ch both ends are wound on said lock pin and said hinge pin; said lock pin is ins erted into a lock pin hole provided in said lever; when said top plate and said legs are in open position and locked state, said lock pin engages with a first n otch provided in said leg base; when said top plate and said legs are in close p osition and locked state, said lock pin engages with a second notch provided in said leg base; and when said top plate and said legs are in unlocked state, a tr igger moved linearly and supported by a bracket attached to said top plate base locks said lever.[Effects of the Invention]

[0010] According to the configuration of claim 1, said joint fitting of the present inv ention enables to operate the open-legs and the closed-legs in a stable state si nce said lever is locked in the transition state of the legs opening and closing[Brief Description of Drawings]

[0011] FIG. 1 is a perspective view showing the joint fitting of the present invention. FIG. 2 is a plane view showing the joint fitting of the present invention. FIG. 3 is a left side view showing the joint fitting of the present invention. FIG. 4 is a cross-sectional view showing the joint fitting of the present invent ion. FIG. 5 is a simplified diagram showing a state in which the lever is operable in the open-leg state of the joint fitting of the present invention. FIG. 6 is a simplified diagram showing a state in which the lever is locked in t he open-leg state of the joint fitting of the present invention. FIG. 7 is a simplified diagram showing a state of a transition from the open-leg state to the closed-leg state of the joint fitting of the present invention. FIG. 8 is a simplified diagram showing a state in which the lever is unlocked in the closed-leg state of the joint fitting of the present invention. [Description of Embodiments]

[0012] In the present invention, the following embodiments will now be described with r eference to the accompanying drawings.[Embodiment 1]

[0013] FIG. 1 to 4 are outline drawings of the joint fitting 1 of the present invention , FIG. 1 is a perspective view showing the joint fitting 1, FIG. 2 is a plane vi ew showing the joint fitting 1, FIG. 3 is a left side view showing the joint fit ting 1, and FIG. 4 is a cross-sectional view showing the joint fitting 1 taken a long the line A-A of FIG. 2. The joint fitting 1 is possible to be attached to a table top plate and legs supporting the top plate.

[0014] The joint fitting 1 comprises a top plate base 100 attached to the underside of the top plate, a leg base 200 attached to a leg supporting the top plate, and a hinge pin 300 capable of pivotally supporting and swinging the top plate base 10 0 and the leg base 200.

[0015] The top plate base 100 in this embodiment comprises a back plate 110 secured to the top plate and side plates 120 formed by drooping from the back plate 110 to both sides. Also, the leg base 200 in this embodiment comprises a back plate 210 secured to the leg and side plates 220 formed by bending from the back plate 21 0 to both sides. The side plates 120 and the side plates 220 are provided with h inge holes (not shown), and the hinge pin 300 inserted into each hinge hole cap able of pivotally supporting the overlapped side plates 120 and the side plates 220 and swinging the top plate base 100 and the leg base 200 within a predetermi ned range.

[0016] A plurality of threaded holes (not shown), are formed at the back plate 110 of t he top plate base 100. Also, a plurality of threaded holes (not shown), are for med at the back plate 210 of the leg base 200. The threaded holes in the back pl ate 110 of the top plate base 100 are for screwing the top plate base 100 to the top plate, and the threaded holes in the back plate 210 of the leg base 200 are for screwing the leg base 200 to the leg.

[0017] The joint fitting 1 is provided with a lever 400 and a lock pin 500 as a mechani sm for locking the top plate base 100 and the leg base 200. The lever 400 in thi s embodiment is a component for operating the lock pin 500 and is pivotally supp orted by the lever pin 800 inserted into the bracket holes 131 provided in the b rackets 130 attached to the top plate base 100 and swings within a predetermined range. In the lever 400, the handle 410 is formed by bending in the open direct ion of the joint fitting 1. The user presses the handle 410 to operate the lever 400. The lever 400 is provided with a lock pin hole 420 through which the lock pin 500 is inserted. The lock pin hole 420 is formed in a slotted hole shape and is provided with some play portion in the diameter of the body portion of the 1 ock pin 500.

[0018] A spring 600 is attached to the lock pin 500. The spring 600 in this embodiment is a coil spring, one end is wound on the lock pin 500 and the other end is woun d on the hinge pin 300.

[0019] The side plate 220 of the leg base 200 is formed in a generally semi-circular fo r side view, with a first notch 221 provided at a far side from the back plate 2 10 and a second notch 222 provided at a near side from the back plate 210 and a far side from the back plate 110 of the top plate base 100. See FIG. 3 and 4 for the positions of the first notch 221 and the second notch 222. The lock pin 500 is engaged into the first notch 221 and the second notch 222 provided in the le g base 200 and inserted into the slotted hole 121 provided in the top plate base 100 to lock the top plate base 100 and the leg base 200.

[0020] The first notch 221 engages the lock pin 500 in the open-leg state and the secon d notch 222 engages the lock pin 500 in the closed-leg state. A peripheral surfa ce 223 is provided between the first notch 221 and the second notch 222 of the s ide plate 220 of the leg base 200. The lock pin 500 is possible to be moved in c ontact with the peripheral surface 223 by operation of the lever 400.

[0021] FIG. 5 is a simplified diagram showing a state in which the lever 400 is operabl e in the open-leg state of the joint fitting 1 of the present invention. Also, F IG. 6 is a simplified diagram showing a state in which the lever 400 is locked i n the open-leg state of the joint fitting 1 of the present invention. A trigger 700 is supported on the bracket 130 attached to the back plate 110 of the top pl ate base 100. The trigger 700 is formed by plate-shaping in planar view and J-sh aping in side view, with a slit (not shown) formed in the planar portion and the lever 400 inserted in the slit. The inside of the tip-side slit of the planar p ortion of the trigger 700 contacts the peripheral surface 430 or dent portion 44 0 of the lever 400. A spring 710 is inserted into the slit and the trigger 700 i s loaded in the direction of the back plate 210 of the leg base 200. When the le ver 400 is operated, the tip side of the planar portion of the trigger 700 enter s the dent portion 440 in a position where the lever 400 is pushed through to lo ck the lever 400.

[0022] FIG. 7 is a simplified diagram showing a state of a transition from the open-leg state to the closed-leg state of the joint fitting 1 of the present invention. Also, FIG. 8 is a simplified diagram showing a state in which the lever 400 is u nlocked in the closed-leg state of the joint fitting 1 of the present invention. When the lever 400 is in a locked state by the trigger 700, the lock pin 500 is separated from the first notch 221 with the sway of the lever 400 and is in an unlocked state where the leg is possible to be closed. In the transition state f rom the open-leg state to the closed-leg state, the lock pin 500 moves in the di rection of the second notch 222 in contact with the peripheral surface 223. A pu sh pin 224 is formed in the side plate 220 of the leg base 200, and the push pin 224 pushes the curved portion of the trigger 700 when the lock pin 500 approach es the second notch 222. The planar portion of the trigger 700 is separated from the dent portion 440 when the trigger 700 is pushed in the direction of the bac k plate 110 of the top base 100. When the lock pin 500 reaches the second notch 222 with the planar portion of the trigger 700 separated from the dent portion 4 40, the loaded spring 600 locks the lock pin 500 to the second notch 222 and the lever 400 returns to the original position.

[0023] When the joint fitting 1 transitions from the closed-leg state to the open-leg s tate, the user operates the lever 400 in the similar way. Upon operation of the lever 400, the trigger 700 locks the lever 400 with the tip side of the planar p ortion of the trigger 700 entering the dent portion 440 in a position where the lever 400 has been pushed through.

[0024] When the lever 400 is in the locked state by the trigger 700, the lock pin 500 i s separated from the second notch 222 with the sway of the lever 400 and is in t he unlocked state where the leg is possible to be opened. In the transition stat e from the open-leg state to the closed-leg state, the lock pin 500 moves in the direction of the first notch 221 in contact with the peripheral surface 223. Th e push pin 224 pushes the curved portion of the trigger 700 when the lock pin 50 0 moves from the second notch 222 to the peripheral surface 223. The planar port ion of the trigger 700 is separated from the dent portion 440 when the trigger 7 00 is pushed in the direction of the back plate 110 of the top base 100. When th e leg base 200 sways with the planar portion of the trigger 700 separated from t he dent portion 440, the lever 400 returns to the original position by the loade d spring 600, and the tip side of the planar portion of the trigger 700 is in co ntact with the peripheral surface 430 of the lever 400. When the lock pin 500 is locked to the first notch 221, the lever 400 stabilizes in the original positio n.[Description of the reference numerals]

[0025] 1joint fitting; 100top plate base; 110back plate; 120side plate; 121slotted hole; 130bracket; 131bracket hole; 200leg base; 210back plate; 220side plate; 221first notch; 222second notch; 223peripheral surface; 224push pin; 300hinge pin; 400lever; 410handle 420lock pin hole; 430peripheral surface; 440dent portion; 500lock pin; 600spring; 700trigger; 710spring; 800lever pin.

Examples

embodiment 1

[Embodiment 1]

[0013]FIG. 1 to 4 are outline drawings of the joint fitting 1 of the present invention , FIG. 1 is a perspective view showing the joint fitting 1, FIG. 2 is a plane vi ew showing the joint fitting 1, FIG. 3 is a left side view showing the joint fit ting 1, and FIG. 4 is a cross-sectional view showing the joint fitting 1 taken a long the line A-A of FIG. 2. The joint fitting 1 is possible to be attached to a table top plate and legs supporting the top plate.

[0014] The joint fitting 1 comprises a top plate base 100 attached to the underside of the top plate, a leg base 200 attached to a leg supporting the top plate, and a hinge pin 300 capable of pivotally supporting and swinging the top plate base 10 0 and the leg base 200.

[0015]The top plate base 100 in this embodiment comprises a back plate 110 secured to the top plate and side plates 120 formed by drooping from the back plate 110 to both sides. Also, the leg base 200 in this embodiment comprises a back plate 210 secu...

[Technical Field]

[0001] The present invention relates to articulating fittings for legs of a foldable ta ble.[Background Art]

[0002] A table may have a structure that allows it to be folded, assuming that it is st ored when not in use. The table, which has the structure in which the top plate is folded vertically, has various functions according to the storage form, such as tilting one top plate or tilting the top plates so as to separate and face ea ch other. On the other hand, the table having the structure in which the legs ar e folded also has various functions such as folding the legs one by one or foldi ng the plurality of legs in conjunction with each other.

[0003] For the tables with the foldable structure, it is important to fix the top plate or legs during use. If the top plate or legs are unintentionally folded during use, not only will the articles placed on the top plate be scattered, but there is a risk of causing an injury to the user.

[0004] As a mechanism for folding the legs, a joint fitting that prevents the legs from unsteadiness, and enables the legs to be closed and opened in a stable state an d the locking state to be easily released is disclosed (cf Patent Document 1).

[0005] The applicant improved the joint fitting disclosed in Patent Document 1, and dis closed an joint fitting with an auxiliary structure that can minimize the unstea diness as much as possible while following the superior operability of the locki ng mechanism involving crossbeams, notch sections, and long holes (cf Patent Do cument 2).[Description of the Prior Art][Patent Documents]

[0006] [Patent Document 1] Japanese Utility Model Registration Publication No. 3055557 [Patent Document 2] WO 2023 / 230310 [Disclosure of the Invention][Problems to be Solved by the Invention]

[0007] The joint fitting disclosed in Patent Document 2 is characterized by the operabi lity of the locking mechanism, and it is easy to switch between the locked state and the unlocked state. However, since the lever that operates the locking mech anism is not configuration to be lockable, there is a problem of the lever movin g unintentionally when the legs are opened or closed.

[0008] Therefore, an object of the present invention is to provide the joint fitting ha ving the mechanism for locking the lever to switch between the locked state and the unlocked state, and the lever that enables to be locked when the leg is open ed and closed.[Means for solving the problem]

[0009] That is, the present invention is intended to achieve the above-mentioned object , and the means of claim 1 is a joint fitting comprising: a top plate base attac hed to an underside of a top plate; a leg base attached to a leg supporting said top plate; a hinge pin capable of pivotally supporting and swinging said top pl ate base and said leg base; a lock pin that inserted into a long hole provided i n said top plate base capable of locking said top plate base and said leg base; a lever for operating said lock pin; a lever pin that inserted into said top pla te base capable of pivotally supporting and swinging said lever; a spring in whi ch both ends are wound on said lock pin and said hinge pin; said lock pin is ins erted into a lock pin hole provided in said lever; when said top plate and said legs are in open position and locked state, said lock pin engages with a first n otch provided in said leg base; when said top plate and said legs are in close p osition and locked state, said lock pin engages with a second notch provided in said leg base; and when said top plate and said legs are in unlocked state, a tr igger moved linearly and supported by a bracket attached to said top plate base locks said lever.[Effects of the Invention]

[0010] According to the configuration of claim 1, said joint fitting of the present inv ention enables to operate the open-legs and the closed-legs in a stable state si nce said lever is locked in the transition state of the legs opening and closing[Brief Description of Drawings]

[0011] FIG. 1 is a perspective view showing the joint fitting of the present invention. FIG. 2 is a plane view showing the joint fitting of the present invention. FIG. 3 is a left side view showing the joint fitting of the present invention. FIG. 4 is a cross-sectional view showing the joint fitting of the present invent ion. FIG. 5 is a simplified diagram showing a state in which the lever is operable in the open-leg state of the joint fitting of the present invention. FIG. 6 is a simplified diagram showing a state in which the lever is locked in t he open-leg state of the joint fitting of the present invention. FIG. 7 is a simplified diagram showing a state of a transition from the open-leg state to the closed-leg state of the joint fitting of the present invention. FIG. 8 is a simplified diagram showing a state in which the lever is unlocked in the closed-leg state of the joint fitting of the present invention. [Description of Embodiments]

[0012] In the present invention, the following embodiments will now be described with r eference to the accompanying drawings.[Embodiment 1]

[0013] FIG. 1 to 4 are outline drawings of the joint fitting 1 of the present invention , FIG. 1 is a perspective view showing the joint fitting 1, FIG. 2 is a plane vi ew showing the joint fitting 1, FIG. 3 is a left side view showing the joint fit ting 1, and FIG. 4 is a cross-sectional view showing the joint fitting 1 taken a long the line A-A of FIG. 2. The joint fitting 1 is possible to be attached to a table top plate and legs supporting the top plate.

[0014] The joint fitting 1 comprises a top plate base 100 attached to the underside of the top plate, a leg base 200 attached to a leg supporting the top plate, and a hinge pin 300 capable of pivotally supporting and swinging the top plate base 10 0 and the leg base 200.

[0015] The top plate base 100 in this embodiment comprises a back plate 110 secured to the top plate and side plates 120 formed by drooping from the back plate 110 to both sides. Also, the leg base 200 in this embodiment comprises a back plate 210 secured to the leg and side plates 220 formed by bending from the back plate 21 0 to both sides. The side plates 120 and the side plates 220 are provided with h inge holes (not shown), and the hinge pin 300 inserted into each hinge hole cap able of pivotally supporting the overlapped side plates 120 and the side plates 220 and swinging the top plate base 100 and the leg base 200 within a predetermi ned range.

[0016] A plurality of threaded holes (not shown), are formed at the back plate 110 of t he top plate base 100. Also, a plurality of threaded holes (not shown), are for med at the back plate 210 of the leg base 200. The threaded holes in the back pl ate 110 of the top plate base 100 are for screwing the top plate base 100 to the top plate, and the threaded holes in the back plate 210 of the leg base 200 are for screwing the leg base 200 to the leg.

[0017] The joint fitting 1 is provided with a lever 400 and a lock pin 500 as a mechani sm for locking the top plate base 100 and the leg base 200. The lever 400 in thi s embodiment is a component for operating the lock pin 500 and is pivotally supp orted by the lever pin 800 inserted into the bracket holes 131 provided in the b rackets 130 attached to the top plate base 100 and swings within a predetermined range. In the lever 400, the handle 410 is formed by bending in the open direct ion of the joint fitting 1. The user presses the handle 410 to operate the lever 400. The lever 400 is provided with a lock pin hole 420 through which the lock pin 500 is inserted. The lock pin hole 420 is formed in a slotted hole shape and is provided with some play portion in the diameter of the body portion of the 1 ock pin 500.

[0018] A spring 600 is attached to the lock pin 500. The spring 600 in this embodiment is a coil spring, one end is wound on the lock pin 500 and the other end is woun d on the hinge pin 300.

[0019] The side plate 220 of the leg base 200 is formed in a generally semi-circular fo r side view, with a first notch 221 provided at a far side from the back plate 2 10 and a second notch 222 provided at a near side from the back plate 210 and a far side from the back plate 110 of the top plate base 100. See FIG. 3 and 4 for the positions of the first notch 221 and the second notch 222. The lock pin 500 is engaged into the first notch 221 and the second notch 222 provided in the le g base 200 and inserted into the slotted hole 121 provided in the top plate base 100 to lock the top plate base 100 and the leg base 200.

[0020] The first notch 221 engages the lock pin 500 in the open-leg state and the secon d notch 222 engages the lock pin 500 in the closed-leg state. A peripheral surfa ce 223 is provided between the first notch 221 and the second notch 222 of the s ide plate 220 of the leg base 200. The lock pin 500 is possible to be moved in c ontact with the peripheral surface 223 by operation of the lever 400.

[0021] FIG. 5 is a simplified diagram showing a state in which the lever 400 is operabl e in the open-leg state of the joint fitting 1 of the present invention. Also, F IG. 6 is a simplified diagram showing a state in which the lever 400 is locked i n the open-leg state of the joint fitting 1 of the present invention. A trigger 700 is supported on the bracket 130 attached to the back plate 110 of the top pl ate base 100. The trigger 700 is formed by plate-shaping in planar view and J-sh aping in side view, with a slit (not shown) formed in the planar portion and the lever 400 inserted in the slit. The inside of the tip-side slit of the planar p ortion of the trigger 700 contacts the peripheral surface 430 or dent portion 44 0 of the lever 400. A spring 710 is inserted into the slit and the trigger 700 i s loaded in the direction of the back plate 210 of the leg base 200. When the le ver 400 is operated, the tip side of the planar portion of the trigger 700 enter s the dent portion 440 in a position where the lever 400 is pushed through to lo ck the lever 400.

[0022] FIG. 7 is a simplified diagram showing a state of a transition from the open-leg state to the closed-leg state of the joint fitting 1 of the present invention. Also, FIG. 8 is a simplified diagram showing a state in which the lever 400 is u nlocked in the closed-leg state of the joint fitting 1 of the present invention. When the lever 400 is in a locked state by the trigger 700, the lock pin 500 is separated from the first notch 221 with the sway of the lever 400 and is in an unlocked state where the leg is possible to be closed. In the transition state f rom the open-leg state to the closed-leg state, the lock pin 500 moves in the di rection of the second notch 222 in contact with the peripheral surface 223. A pu sh pin 224 is formed in the side plate 220 of the leg base 200, and the push pin 224 pushes the curved portion of the trigger 700 when the lock pin 500 approach es the second notch 222. The planar portion of the trigger 700 is separated from the dent portion 440 when the trigger 700 is pushed in the direction of the bac k plate 110 of the top base 100. When the lock pin 500 reaches the second notch 222 with the planar portion of the trigger 700 separated from the dent portion 4 40, the loaded spring 600 locks the lock pin 500 to the second notch 222 and the lever 400 returns to the original position.

[0023] When the joint fitting 1 transitions from the closed-leg state to the open-leg s tate, the user operates the lever 400 in the similar way. Upon operation of the lever 400, the trigger 700 locks the lever 400 with the tip side of the planar p ortion of the trigger 700 entering the dent portion 440 in a position where the lever 400 has been pushed through.

[0024] When the lever 400 is in the locked state by the trigger 700, the lock pin 500 i s separated from the second notch 222 with the sway of the lever 400 and is in t he unlocked state where the leg is possible to be opened. In the transition stat e from the open-leg state to the closed-leg state, the lock pin 500 moves in the direction of the first notch 221 in contact with the peripheral surface 223. Th e push pin 224 pushes the curved portion of the trigger 700 when the lock pin 50 0 moves from the second notch 222 to the peripheral surface 223. The planar port ion of the trigger 700 is separated from the dent portion 440 when the trigger 7 00 is pushed in the direction of the back plate 110 of the top base 100. When th e leg base 200 sways with the planar portion of the trigger 700 separated from t he dent portion 440, the lever 400 returns to the original position by the loade d spring 600, and the tip side of the planar portion of the trigger 700 is in co ntact with the peripheral surface 430 of the lever 400. When the lock pin 500 is locked to the first notch 221, the lever 400 stabilizes in the original positio n.[Description of the reference numerals]

[0025] 1joint fitting; 100top plate base; 110back plate; 120side plate; 121slotted hole; 130bracket; 131bracket hole; 200leg base; 210back plate; 220side plate; 221first notch; 222second notch; 223peripheral surface; 224push pin; 300hinge pin; 400lever; 410handle 420lock pin hole; 430peripheral surface; 440dent portion; 500lock pin; 600spring; 700trigger; 710spring; 800lever pin.

Examples

embodiment 1

[Embodiment 1]

[0013]FIG. 1 to 4 are outline drawings of the joint fitting 1 of the present invention , FIG. 1 is a perspective view showing the joint fitting 1, FIG. 2 is a plane vi ew showing the joint fitting 1, FIG. 3 is a left side view showing the joint fit ting 1, and FIG. 4 is a cross-sectional view showing the joint fitting 1 taken a long the line A-A of FIG. 2. The joint fitting 1 is possible to be attached to a table top plate and legs supporting the top plate.

[0014] The joint fitting 1 comprises a top plate base 100 attached to the underside of the top plate, a leg base 200 attached to a leg supporting the top plate, and a hinge pin 300 capable of pivotally supporting and swinging the top plate base 10 0 and the leg base 200.

[0015]The top plate base 100 in this embodiment comprises a back plate 110 secured to the top plate and side plates 120 formed by drooping from the back plate 110 to both sides. Also, the leg base 200 in this embodiment comprises a back plate 210 secu...

Claims

1. A joint fitting comprising: a top plate base attached to an underside of a top p late; a leg base attached to a leg supporting said top plate; a hinge pin capable of pivotally supporting and swinging said top plate base and said leg base; a lock pin that inserted into a long hole provided in said top plate base capabl e of locking said top plate base and said leg base; a lever for operating said lock pin; a lever pin that inserted into said top plate base capable of pivotally supporti ng and swinging said lever; a spring in which both ends are wound on said lock pin and said hinge pin; said lock pin is inserted into a lock pin hole provided in said lever; when said top plate and said legs are in open position and locked state, said lock pin en gages with a first notch provided in said leg base; when said top plate and said legs are in close position and locked state, said lock pin engages with a secon d notch provided in said leg base; and when said top plate and said legs are in unlocked state, a trigger moved linearly and supported by a bracket attached to said top plate base locks said lever.

Images