JPH0596400U - Step lock device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] The connecting plates on the upper side of a pair of legs with a crossing between the left and right columns are overlapped, and a pivot is provided at the overlapping part of the connecting plates. In the step that can be opened and closed freely,
It is an object of the present invention to provide a structure capable of reliably locking a step with a simple structure. [Structure] The connecting plates 4 and 5 on the upper side of a pair of legs 3 and 3 in which a step bar 2 is horizontally provided between the left and right columns 1 and 1 are overlapped, and a pivot is provided at the overlapping part of the connection plates. Open the legs
It is a stepped foot that can freely close legs, and an arcuate elongated hole 7 centered on a pivot is engraved in one of the connecting plates, and a lock hole 8 having a diameter larger than the groove width of the arcuate elongated hole is formed at the center side end of the arcuate elongated hole. A lock pin having a small-diameter portion that fits into the arc-shaped long hole and a large-diameter portion that fits into the lock hole at a position of the other connecting plate that corresponds to the lock hole of the one connecting plate when the leg is opened. 11 is a step-locking device which is fitted in an arc-shaped long hole and is urged by an elastic body so as to be movable back and forth.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a step lock device used when working at a high place.

[0002]

[Prior Art]

 The pedestal should be used when working in high places, etc., and when not in use, the legs should be closed to save space, and the legs should be opened during use, but the legs should not be closed during use. A locking device is provided to ensure safety. As a conventional step locking device, there is one shown in FIGS. 9 and 10.

In the step lock device shown in FIG. 9, one leg 101 is pivotally attached with an opening stopper metal 102, and the other leg 103 is provided with a receiving pin 104 for locking the opening stopper metal 102. There is. Further, in the step locking device shown in FIG. 10, the coupling plates 202 on the upper side of the pair of legs 201 are overlapped with each other, and the pivot 203 is provided at the overlapping portion of the coupling plates 202 so that the legs 201 can be freely opened and closed. In addition, the opening prevention metal fitting 204 is provided, and the opening prevention metal fitting 204 is engaged when the leg is opened.

[0004]

[Problems to be solved by the device]

 The step locking device shown in FIG. 9 has to open the legs and then hang the opening-stopping metal fitting 102, which may be forgotten. In addition, there is a problem that the angles of the legs 101 and 103 must be adjusted depending on the length of the opening prevention metal fitting 102.

Further, the locking device for the step shown in FIG. 10 does not forget to lock it when the legs are opened, but it has a large number of parts and has a structure that is too complicated, which requires more man-hours for mounting.

[0006]

[Means for Solving the Problems]

 Therefore, in consideration of the above circumstances, the present invention proposes a structure in which upper and lower parts of a pair of legs are provided horizontally with a step rail between left and right columns in order to ensure that the step can be locked with a simple structure. This is a step pedestal in which connecting plates are superposed and a pivot is provided in the superposed part of the connecting plates to make the legs open / closed, and one connecting plate is provided with an arc long hole centered on the pivot. , A lock hole with a diameter larger than the groove width of the circular arc long hole is provided at the end on the center side of the circular arc long hole, and the circular arc length is located at the position of the other connecting plate corresponding to the lock hole of one connecting plate when the leg is opened. A lock for a stepped base in which a lock pin having a small-diameter portion that fits in the hole and a large-diameter portion that fits in the lock hole is fitted in the arc-shaped long hole and urged by an elastic body so that it can move back and forth. It is a device.

[0007]

[Action]

 When the large diameter part of the lock pin fits into the lock hole and keeps the leg open, the lock pin is pushed against the urging force of the elastic body to fit the small diameter part of the lock pin into the circular arc long hole. Can be closed.

[0008]

【Example】

 The present invention will be described in detail below based on a specific embodiment shown in the accompanying drawings. 1 to 3 show the outline of the entire step of the present invention. Two legs 2 are horizontally provided between the left and right columns 1 to form a leg 3. In order to connect the legs 3 to each other, connecting plates 4 and 5 are fixed to the upper parts of the legs 3 respectively. The connecting plate 4 is placed on the outside and the connecting plate 5 is placed on the inside, and a pivot 6 is provided at the overlapping portion so that the leg body 3 can be freely opened and closed.

As shown in FIGS. 4 and 5, one connecting plate 4 is provided with a circular arc elongated hole 7 centered on the pivot 6, and the circular arc elongated hole 7 is formed at the end of the circular arc elongated hole 7 on the center side. Engrave a lock hole 8 with a diameter larger than the groove width. Further, at the position of the other connecting plate 5 corresponding to the lock hole 8 of the one connecting plate 4 when the leg is opened, the small diameter portion 9 that fits into the arc-shaped elongated hole 7 is fitted into the lock hole 8. A lock pin 11 having a large diameter portion 10 is fitted into the arcuate elongated hole 7 and is urged by an elastic body 12 such as a coil spring so as to be movable back and forth. That is, as shown in FIG. 5, a cut-and-raised portion 13 is provided on the connecting plate 5 at a position corresponding to the lock hole 8 when the leg is opened, and a lock pin 11 is provided so as to be movable back and forth with an elastic body 12 interposed. The lock pin 11 has a small-diameter portion 9, a large-diameter portion 10, and a shaft portion 14 on the distal end side. And the lock pin 11 is urged outward, and the large diameter portion 10 is set in the lock hole 8 in the natural state of the elastic body 12. In order to prevent the lock pin 11 from coming out, the base end of the lock pin 11 is crimped to form an engaging portion 15.

6 and 7 show the state in which the leg body 3 is closed and the lock pin 11 is pushed against the urging force of the elastic body 12 in the state shown in FIGS. When the lock pin 11 is moved to the circular arc long hole 7 side in this state, the large diameter portion 10 enters inside and the lock hole 8 is disengaged, and the small diameter portion 9 of the lock pin 11 is fitted into the circular arc long hole 7. To meet. The lock pin 11 is biased outward by the elastic body 12, but the large diameter portion 10 is larger than the groove width of the circular arc elongated hole 7, so that the lock pin 11 is located in the circular arc elongated hole 7. When the legs 3 are closed in this state, the legs 3 shown in FIGS. 6 and 7 are closed.

FIG. 8 shows a mounting position of the connecting plate 5, and the connecting plate 5 is fixed to the inner side surface of the upper portion of the column 1. The lock device for the step is not limited to one, but can be provided on both sides.

[0012]

[Effect of the device]

 According to the present invention, as described above, the upper connecting plates of the pair of legs in which the crosspieces are horizontally provided between the left and right columns are overlapped with each other, and the pivot is provided at the overlapping part of the connection plates to form the legs. It is a step that can be opened and closed freely, and one of the connecting plates has a circular arc long hole centered on the pivot, and the lock hole with a diameter larger than the groove width of the circular arc long hole at the center-side end of the circular arc long hole. A lock having a small-diameter portion fitted into the arc-shaped long hole and a large-diameter portion fitted into the lock hole at the position of the other connecting plate corresponding to the lock hole of the one connecting plate when the leg is opened. Since the lock device for the step is formed by fitting the pin into the circular arc long hole and urging it with an elastic body so as to be able to move forward and backward, the lock device can be installed in the connecting plate portion with a very simple structure.

Further, according to the present invention, since the lock device is provided at the pivot portion of the connecting plate, the lock device operates at the same time as opening and closing, and the lock device is never forgotten. Further, since the present invention does not have a separate opening stop fitting as in the conventional case, it is not necessary to adjust the angle of the legs by the opening stop fitting. Furthermore, since the lock device uses only a lock pin and an elastic body, the number of parts is small and the structure is extremely simple, and the number of mounting steps is also small.

[Brief description of drawings]

FIG. 1 is a front view showing an outline of the whole of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an enlarged right side view of the main part of the present invention with the legs open.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an enlarged right side view of the main part of the present invention with the legs closed.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is an enlarged front view of the main part of the present invention.

FIG. 9 is a side view of the step of the related art in a state where the opening stopper is hung.

FIG. 10 is an enlarged side view of essential parts showing another conventional step locking device.

[Explanation of symbols]

 1 ... Strut 2 ... Step 3 ... Leg 4 ... One connecting plate 5 ... The other connecting plate 7 ... Arc long hole 8 ... Lock hole 9 ... Small diameter part 10 ... Large diameter part 11 ... Lock pin 12 ... Elastic body

Claims (1)

[Scope of utility model registration request] 1. A leg is opened and closed by stacking a connecting plate on the upper side of a pair of legs having a horizontal crossing between the left and right struts, and providing a pivot at the overlapping portion of the connecting plates. It is a freely accessible step, in which one connecting plate is engraved with an arc long hole centered on the pivot, and a lock hole with a diameter larger than the groove width of the arc long hole is provided at the center-side end of the arc long hole. An arc length of a lock pin having a small diameter portion that fits in the arc-shaped long hole and a large diameter portion that fits in the lock hole is formed at the position of the other connection plate corresponding to the lock hole of one of the connection plates when legged. A step lock device that is fitted in a hole and urged by an elastic body so that it can move back and forth.