JP2605060Y2 - Joint mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint mechanism applied to, for example, a wheelchair handle.

[0002]

2. Description of the Related Art A conventional configuration (Japanese Utility Model Publication No. 57-31851)
No.) are shown in FIGS. In the figure, a fork-shaped rotating block (3) is provided at the tip of one shaft (1), and a plate-shaped rotating block (4) is provided at the tip of the other shaft (2). The rotating block (4) is mounted in the rotating block (3) so as to be rotatable about a rotating shaft (5). And one end is provided with a locking block (7) and the other end is a nut
(8) and a shaft rod (6) smaller in diameter than the locking block (7).
Slidably penetrate the pair of rotating blocks (3, 4), and the locking rod (10) is a lock spring.
(9) is urged in the locking direction. Further, a through hole (11) through which the locking block (7) penetrates is provided on one side of the rotating block (3). ) In the through hole
Attach the leaf spring (12) to the (11)
(4) is provided with a locking hole (13) into which the locking block (7) is fitted, and a notch (14) leading from the lower edge of the rotating block (4) to the locking hole (13). Is provided.

In the above configuration, in the bent state shown in FIG. 5, the leaf spring (12) of the rotating block (3) projects from the through-hole (11), and the locking block of the locking rod (10). (7) abuts on the leaf spring (12) to lock the locking rod (10) from sliding in the locking direction. When the shaft (2) is rotated in the direction of arrow A with respect to the shaft (1) from the above bent state, FIG.
In the state (1), the shaft (6) of the locking rod (10) fits into the locking hole (13) of the rotating block (4) of the shaft (2) through the notch (14), and At the lower edge of the block (4), the leaf spring (12) is pushed out of the through hole (11) of the rotating block (3), and thus the locking rod (10) is moved by the lock spring (9) as shown in FIG.
Is pushed in the locking direction (the direction of the arrow in FIG. 7) and the locking rod (10)
The locking block (7) is fitted into the locking hole (13) of the rotating block (4), and the rotation of the rotating block (4) is locked.

[0004]

[Problem to be Solved by the Invention] However, in the above-mentioned conventional configuration, the notch (14) must be provided in the locking hole (13) of the rotating block (4), so that the shaft rod is in the rotation locked state. When a large torque is applied to the rotary block (4) via (1, 2), the rotary block (4) is deformed through the notch (14) and the locking hole (13). There was a point.

[0005]

According to the present invention, as a means for solving the above-mentioned conventional problems, a pair of rotating blocks (2) which are rotatably joined to each other around a rotating shaft (25) are provided.
3,24) with one of two
A bifurcated shape constructed by rotating Dohen (24A, 24B), each rotational
Each of the pieces (24A, 24B) is provided with an arc-shaped guide groove (24D) centered on the rotation shaft (25), and one end of the guide groove (24D) is larger than the width of the guide groove (24D). wide engagement holes (24E) is provided, the other
With three rotating pieces (23A, 2
3B, 23C) to form a trifurcated shape,
Two pivoting pieces (23A, 23B) to said one rotation block is to be
Lock holes (23F) corresponding to the lock holes (24E)
The other rotating piece (23C) corresponds to the locking hole (23F).
Position smaller diameter than the engaging stop hole (23F) in the axial杆貫hole the (23E)
Provided, locking holes of the pair of pivot block (23,24) (23F, 24
E) and the shaft rod through-hole (23E) , slidably penetrate the locking rod (30), and the locking rod (30) is connected to the one rotation block (24).
Shaft (26) having a diameter smaller than the width of the guide groove (24D)
And one of the rotary blocks formed at the distal end of the shaft rod (26).
The lock rod (30) is formed by a locking spring (29) with a large- diameter locking block (27) that fits tightly into a locking hole (24E) wider than the guide groove (24D) of the guide (24 ). Large-diameter locking block (2
7) is provided so that the joint mechanism is urged in a direction to fit into the locking hole (24E).

[0006]

In the rotation locked state, the enlarged diameter locking block (27) of the locking rod (30) is rotated by the rotation pieces (24A, 24A ) of one of the rotation blocks (24).
Locking hole of B) (24E) and the other pivot block two of the (23)
The rotation pieces (23A, 23B) are tightly engaged with the locking holes (23F) of the rotation pieces (23A, 23B) to lock the mutual rotation of the pair of rotation blocks (23, 24).
In this state, the inner end of the locking block (27) of the locking rod (30) is
Shaft penetrating the outer rotating piece (23C) of the other rotating block (23)
It comes into contact with the outer periphery of the hole (23E) to prevent it from coming off. The locking rod (30) is pressed against the urging force of the lock spring (29) to push the locking block (27) to the rotating piece of one of the rotating blocks (24).
When the lock is released from the locking holes (24E , 24E ) of the (24A, 24B) and the lock is released, the shaft (26) of the locking rod (30) is
Since the diameter of the guide groove (24D , 24D ) of the rotating piece (24A, 24B) of ( 24 ) is smaller than the width of the guide groove (24
D) can be slid, so that the pair of rotating blocks (23, 24) can be mutually rotated.

In this state, the locking block of the locking rod (30)
(27) abuts both edges of the guide groove (24D) of the rotating block (24), and the locking rod is pressed by the urging force of the lock spring (29).
(30) does not slide in the locking direction.

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

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. The leading end of one shaft (21) is provided at a predetermined interval.
A trifurcated rotating block (23) composed of three rotating pieces (23A, 23B, 23C) arranged in
2) two tips arranged at a predetermined interval at the tip of
Dynamic piece (24A, 24B) bifurcated pivot block (24) is provided consisting of two of the turning piece of the pivoting block (24) (24A, 24B)
Are the three turning pieces (23A, 23A ) of the forked turning block (23).
B, 23C) , and are rotatably joined to each other around a bolt-shaped rotation shaft (25) .The rotation shaft (25) is connected to the pair of rotation blocks (23 , 24) penetrate through the shaft holes (23D, 24C) and are fixed by nuts (25A).

[0010] The fork-shaped rotating block of the other shaft rod (22)
Each pivot piece (24) (24A, 24B) to is arcuate guide grooves around the pivot shaft (25) (24D) are respectively provided, at one end of the guide groove (24D) is An engaging hole (24E) wider than the width of the guide groove (24D) is provided.

[0011] A forked pivot block of one shaft rod (21)
On one outer rotating piece (23C) of (23), a shaft rod through hole (23E)
, The other outer pivot piece (23A) and the central pivot piece (23B)
Locking rod through holes in (23F) is provided, through holes (23F)
A locking hole of the turning piece of the pivoting block (24) (24A, 24B) (2
4E) are provided in corresponding shapes at corresponding positions.

Reference numeral (30) denotes a locking rod which slidably penetrates the pair of rotating blocks (23, 24), and the locking rod (30) is one of the rotating blocks (23). through holes of the outer rotating piece (23C)
(23E), and a locking block (27) formed at the tip of the shaft (26), and the shaft (26) is connected to the rotating block (24). guide grooves of the turning piece of (24A, 24B) (2
4D), the locking block (27) fits tightly into a locking hole (24E) wider than the guide groove (24D).

[0013] A knob (27A) is formed at the head of the locking rod (30), and a lock spring (29) is interposed between the knob (27A) and the washer (28). The stopper rod (30) is urged in the lock direction shown by the arrow A in FIG.

In the above configuration, in the rotation locked state shown in FIG. 2, the locking block (27) of the locking rod (30) is locked by the locking holes (24A, 24B) of the rotating pieces (24A, 24B) of the rotating block (24). 24E) has closely fitted to, and locking block (27) times the pivot block (23)
Because in contact with the peripheral surface of the through hole of the moving piece (23C) (23E),
Withdrawal of the locking rod (30) by the urging force of the lock spring (29) is prevented.

Press the knob (27A) of the locking rod (30) and press
As shown in the figure, when the lock block (27) of the lock rod (30) is slid in the direction opposite to the arrow A against the urging force of the lock spring (29), the rotation block (24) rotates. The locks are released from the locking holes (24E) of the pieces (24A, 24B) and the locks are released, and the pair of rotating blocks (23, 24) can be rotated relative to each other. At this time, the diameter of the shaft rod (26) of the locking rod (30) is the same as that of the rotating piece (24) of the rotating block (24).
A, 24B) is smaller than the width of the guide groove (24D), so that the shaft rod (26) can slide in the guide groove (24D).

In this state, the locking block (27) of the locking rod (30) in this state is the other outer rotating piece (2) of the rotating block (23).
3A) into the through hole (23F), but the rotating block (2
Since the rotating piece (24A) of 4) is in contact with both edges of the guide groove (24D) of the rotating piece (24A), the locking rod (30) is slid in the locking direction (direction of arrow a) by the urging force of the lock spring (29). Movement is prevented.

The rotating blocks (23, 24) are rotated relative to each other so that the locking block (27) of the locking rod (30) is
Turning piece (24A, 24B) come to the position of the locking hole (24E) of sliding by the biasing force of the lock spring (29) into engagement Tome杆(30) automatically locking direction (arrow b direction) As a result, the locking block (27) is fitted into the locking hole (24E), and the locked state shown in FIG. 2 is again established.

The joint mechanism of the present invention is useful when applied to, for example, a wheelchair handle (31) as shown in FIG. The handle (31) is turned from the use state shown by the solid line to the knob (2) of the locking rod (30).
7A) can be turned to the storage state shown by the dotted line, and when the storage state shown by the dotted line is changed to the use state shown by the solid line, the rotation is automatically locked again by the locking rod (30).

In the above embodiment, the rotation block (23,
24) is connected to the rotating shaft (25) and nut (25) through the shaft holes (23D, 24C).
A), the rotating shaft (25) may be fixed by caulking.

[0020]

[Effects of the Invention] Therefore, in the present invention, the rotation of the joint mechanism is automatically and reliably locked, which is particularly useful for a handle of a wheelchair and the like, and a notch is provided in the locking hole of the rotation block. Since there is no need to provide a joint mechanism, a joint mechanism having extremely high structural strength is provided.

[Brief description of the 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 cross-sectional view of an unlocked state.

FIG. 4 is an explanatory view 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 front cutaway side view in a state where a shaft rod is fitted into a locking hole.

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

[Explanation of symbols]

23,24 Rotating block 23A, 23B, 23C Rotating piece 23D, 24C Shaft hole 24A, 24B Rotating piece 24D Guide groove 23F, 24E Lock hole 25 Rotating shaft 26 Shaft rod 27 Lock block 29 Lock spring 30 Stop rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61G 5/00 511 A61G 5/02-5/02 502 F16C 11/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of rotating blocks, which are rotatably connected to each other about a rotating shaft, are separated by a predetermined distance.
Bifurcated constituted by the two pivoting pieces are arranged Te
Each rotating piece is provided with an arc-shaped guide groove centered on the rotation axis, and one end of the guide groove is provided with a locking hole wider than the width of the guide groove, and the other is provided at a predetermined interval. Arranged
It is composed of three rotating pieces ,
The two adjacent rotating pieces have one of the above rotating blocks.
Provided locking hole corresponding to the engaging holes of the click, the other one of the turning piece
Diameter shaft than engaging stop hole in position corresponding to the locking holes in
The杆貫hole provided, the locking holes of the pair of pivot block and
A locking rod is slidably penetrated through the shaft rod through- hole, and the locking rod is formed at a tip end of the shaft rod having a diameter smaller than the width of the guide groove of the one rotation block. That one time
Closely fits into a locking hole wider than the guide groove width of the moving block
Consists of a radially enlarged locking block, joint mechanism radially enlarged locking block engaging Tome杆 by the lock spring, characterized in that it is biased in a direction to fit into engagement hole