JPH067728U - Joint mechanism - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to provide a joint mechanism having high structural strength applied to a handle of a wheelchair or the like. [Structure] A pair of rotations are provided in a locking hole 24E provided at one end of one guide groove 24D of a pair of rotation blocks 23, 24 which are rotatably joined to each other around a rotation shaft 25. Locking the rotation by inserting the locking block 27 of the locking rod 30 which slidably penetrates the blocks 23 and 24 and is urged in the locking direction by the lock spring 29, and pushes the locking rod 30. The lock block 27 is released from the lock hole 24E to release the lock. The shaft rod 26 of the locking rod 30 slides in the guide groove 24D of the rotating block 24 when the rotating blocks 23 and 24 are mutually rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint mechanism applied to, for example, a handle of a wheelchair.

[0002]

[Prior art]

 The conventional configuration (Jitsuko 57-31851) is shown in FIGS. In the figure, one shaft rod (1) is provided with a forked rotation block (3) at the tip, and the other shaft rod (2) is provided with a plate-shaped rotation block (4) at the tip. The rotating block (4) is mounted in the rotating block (3) so as to be rotatable around a rotating shaft (5). A locking block (7) is provided at one end and a nut (8) is attached to the other end, and a locking rod (10) consisting of a shaft rod (6) having a diameter smaller than that of the locking block (7) is attached to the pair of locking rods (10). The rotation block (3, 4) is slidably pierced, and the locking rod (10) is biased in the lock direction by a lock spring (9), and further, one side of the rotation block (3). Is provided with a through hole (11) through which the locking block (7) penetrates, and a leaf spring (12) protruding from the through hole (11) is installed in the rotation block (3). The turning block (4) is provided with a locking hole (13) into which the locking block (7) is fitted, and a notch (the notch (from the lower edge of the turning block (4) to the locking hole (13)). 14) is provided.

In the above configuration, in the bent state shown in FIG. 5, the leaf springs (12) of the rotating block (3) are projected from the through hole (11), and the locking rod (10) is locked. The block (7) abuts against the leaf spring (12) to prevent the locking rod (10) from sliding in the locking direction. When the shaft rod (2) is rotated in the direction of arrow (a) with respect to the shaft rod (1) from the bent state, the rotation block (4) of the shaft rod (2) is locked in the state shown in FIG. The shaft rod (6) of the locking rod (10) is fitted into the hole (13) through the notch (14), and the leaf spring (12) is rotated at the lower edge of the rotation block (4). 3) is pushed away from the through hole (11), and thus the locking rod (10) is pushed in the locking direction (arrow direction in FIG. 7) by the lock spring (9) as shown in FIG. The locking block (7) is fitted into the locking hole (13) of the rotation block (4), and the rotation of the rotation block (4) is locked.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional structure, since the notch (14) has to be provided in the locking hole (13) of the turning block (4), the turning block (4) must be provided with the notch (14) through the shaft rods (1, 2). When a large torque is applied to the rotating block (4), the rotating block (4) is deformed via the notch (14) and the locking hole (13).

[0005]

[Means for Solving the Problems]

 As a means for solving the above-mentioned conventional problems, the present invention provides one of a pair of rotating blocks (23, 24) that are rotatably joined to each other about a rotating shaft (25). An arc-shaped guide groove (24D) centered on the drive shaft (25) is provided, and a locking hole (24E) wider than the width of the guide groove (24D) is provided at one end of the guide groove (24D). A locking rod (30) is slidably passed through the pair of turning blocks (23, 24), and the locking rod (30) has a diameter smaller than the width of the guide groove (24D). (26) and a lock block (27) tightly fitted in a lock hole (24E) formed at the tip of the shaft rod (26) and wider than the width of the guide groove (24D). (29) provides a joint mechanism in which the locking block (27) is biased in a direction to be fitted into the locking hole (24E).

[0006]

[Action]

 In the rotation locked state, the locking block (27) of the locking rod (30) is tightly fitted into the locking hole (24E) of the one rotation block (24) and the pair of rotation blocks (23, The mutual rotation of 24) is locked. The locking rod (30) is pushed against the urging force of the lock spring (29) to cause the locking block (27) to escape from the locking hole (24E) of the one rotating block (24) to lock. When released, the shaft rod (26) of the locking rod (30) has a diameter smaller than the width of the guide groove (24D) of the rotating block (24), so that the shaft rod (26) is It is possible to slide in the groove (24D), and thus the pair of rotation blocks (23, 24) can rotate relative to each other.

In this state, the locking block (27) of the locking rod (30) comes into contact with both edges of the guide groove (24D) of the rotation block (24), and the urging force of the lock spring (29) causes The locking rod (30) does not slide in the locking direction.

When the rotation blocks (23, 24) are mutually rotated and the locking block (27) of the locking rod (30) reaches the position of the locking hole (24E) of the rotating block (24). The locking rod (30) automatically slides in the locking direction by the urging force of the lock spring (29), and the locking block (27) is fitted into the locking hole (24E) to be locked.

[0009]

【Example】

 The present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. At one end of one shaft rod (21), there is a trifurcating rotary block (23) made of pieces (23A, 23B, 23C). At the tip of the other shaft rod (22) is provided a bifurcated rotary block (24) consisting of pieces (24A, 24B), and the rotary block (24) is the trifurcated rotary block. (23) are fitted to each other and are joined to each other so as to be rotatable about a bolt-shaped rotating shaft (25). The rotating shaft (25) is connected to the pair of rotating blocks (23, It penetrates the shaft hole (23D, 24C) of 24) and is fixed by the nut (25A).

Each piece (24A, 24B) of the bifurcated turning block (24) of the other shaft rod (22) has an arcuate guide groove (24D) centering on the turning shaft (25). The guide groove (24D) is provided with an engaging hole (24E) wider than the width of the guide groove (24D) at one end thereof.

A shaft rod through hole (23E) is provided in one outer piece (23C) of the three-pronged turning block (23) of the one shaft rod (21), and the other outer piece (23A) and the center piece. The piece (23B) is provided with a locking piece through hole (23F), and the through hole (23F) and the locking hole (24E) of each piece (24A, 24B) of the rotating block (24) are different from each other. It is provided in a corresponding shape at each corresponding position.

Reference numeral (30) is a locking rod that slidably penetrates through the pair of rotation blocks (23, 24), and the locking rod (30) is one of the rotation blocks (23). It is composed of a shaft rod (26) penetrating the through hole (23E) of the outer piece (23C) and a locking block (27) formed at the tip of the shaft rod (26). 26) has a diameter smaller than the width of the guide groove (24D) of each piece (24A, 24B) of the rotation block (24), and the locking block (27) is smaller than the width of the guide groove (24D). Fit tightly into the wide locking hole (24E).

A knob (27A) is formed on the head of the locking rod (30), and a lock spring (29) is interposed between the knob (27A) and the washer (28). The locking rod (30) is biased in the locking direction shown by the arrow a in FIG.

In the above-mentioned configuration, in the rotation lock state shown in FIG. 2, the locking block (27) of the locking rod (30) has the locking holes (24E) of the pieces (24A, 24B) of the rotation block (24). Since the locking block (27) is in close contact with the peripheral surface of the through hole (23E) of the piece (23C) of the rotating block (23), the locking block (30) is () Is prevented from being pulled out by the urging force of the lock spring (29).

Pushing the knob (27A) of the locking rod (30) and sliding it in the opposite direction of arrow (a) against the biasing force of the lock spring (29) as shown in FIG. 3, the locking rod ( The locking block (27) of (30) is released from the locking hole (24E) of the piece (24A, 24B) of the rotation block (24), the lock is released, and the pair of rotation blocks (23, 24) ) Are mutually rotatable. At this time, since the diameter of the shaft rod (26) of the locking rod (30) is smaller than the width of the guide groove (24D) of the piece (24A, 24B) of the rotating block (24), the shaft rod (26 26) can slide in the guide groove (24D).

In this state, the locking block (27) of the locking rod (30) is fitted into the through hole (23F) of the other outer piece (23A) of the rotating block (23). Since it is in contact with both edges of the guide groove (24D) of the piece (24A) of the turning block (24), the locking rod (30) is locked in the locking direction (arrow A direction) by the urging force of the lock spring (29). It is prevented from sliding to.

By rotating the rotating blocks (23, 24) with respect to each other, the locking block (27) of the locking rod (30) causes the locking holes () of the pieces (24A, 24B) of the rotating block (24) ( When it reaches the position of (24E), the locking rod (30) automatically slides in the locking direction (direction of arrow a) by the urging force of the lock spring (29), and the locking block (27) is engaged. It fits into the stop hole (24E), and the lock state shown in Fig. 2 is restored again.

The joint mechanism of the present invention is useful when applied to, for example, a handle (31) of a wheelchair as shown in FIG. The handle (31) can be rotated from the use state shown by the solid line to the storage state shown by the dotted line by pressing the knob (27A) of the locking rod (30). In this state, the rotation is automatically locked again by the locking rod (30).

In the above embodiment, the rotation block (23, 24) is fixed by the rotation shaft (25) and the nut (25A) through the shaft hole (23D, 24C), but the rotation shaft (25) is fixed. It may be fixed by crimping.

[0020]

[Effect of device]

 Therefore, in the present invention, the rotation of the joint mechanism is automatically locked, which is particularly useful for a wheelchair handle and the like, and it is not necessary to provide a notch in the locking hole of the rotation block. A joint mechanism having extremely high structural strength is provided.

[Brief description of drawings]

 1 to 4 show an embodiment of the present invention.

FIG. 1 is an exploded perspective view

FIG. 2 is a sectional view of a rotation lock state.

FIG. 3 is a sectional view of the unlocked state.

FIG. 4 is an explanatory diagram applied to a handle of a wheelchair. FIGS. 5 to 7 show a conventional example.

FIG. 5 is a side view of the front notch in a bent state.

FIG. 6 is a side view of the front notch with the shaft rod fitted in the locking hole.

FIG. 7 is a sectional view showing a locked state.

[Explanation of symbols]

 23,24 Rotating block 23D, 24C Shaft hole 24D Guide groove 24E Locking hole 25 Rotating shaft 26 Shaft rod 27 Locking block 29 Lock spring 30 Locking rod

Claims (1)

[Scope of utility model registration request] 1. An arc-shaped guide groove centered on the rotary shaft is provided in one of a pair of rotary blocks that are rotatably joined to each other around the rotary shaft. A locking hole wider than the width of the guide groove is provided at one end, and the locking rod is slidably passed through the pair of rotation blocks. The locking rod has a diameter smaller than the width of the guide groove. It has a shaft rod and a locking block which is formed at the tip of the shaft rod and which is tightly fitted in a locking hole wider than the width of the guide groove. The locking block allows the locking block to be fitted in the locking hole. Joint mechanism characterized by being biased