JPH0536417Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an articulation mechanism applied to, for example, gripping a wheelchair.

[Conventional technology]

The conventional structure (Utility Model Publication No. 57-31851) is shown in FIGS. 7 to 9. In the figure, a bifurcated frame 3 is provided at the tip of one shaft 1, and a rotating piece 4 is provided at the tip of the other shaft 2, and the rotating piece 4 inserts a shaft 5 into the bifurcated frame 3. It is mounted rotatably around the center.
As the rotation lock mechanism 10, a lock piece 7 is provided at one end of the bifurcated frame 3, and a small diameter shaft 6 with a nut 8 attached to the other end is slidably passed in the lateral direction, and the small diameter shaft 6 is fitted with a lock spring. 9 in the locking direction, and furthermore, one side of the bifurcated frame 3 is provided with a through hole 11 through which the locking piece 7 passes, and a through hole 11 is provided inside the bifurcated frame 3 that extends into the through hole 11. A plate spring 12 is attached to the rotating piece 4, and a locking hole 13 into which the locking piece 7 is fitted is provided in the rotating piece 4, and a notch 14 is provided that communicates with the locking hole 13 from the lower edge of the rotating piece 4. .

In the above structure, in the folded state shown in FIG. 7, the leaf spring 12 of the bifurcated frame 3 protrudes from the through hole 11, and the lock piece 7 of the rotation lock mechanism 10 comes into contact with the leaf spring 12. The rotating lock mechanism 10 is prevented 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 above-mentioned bent state, in the state shown in FIG. Then, the small diameter shaft 6 of the rotating lock mechanism 10 is inserted, and the leaf spring 12 is pushed away from the through hole 11 of the bifurcated frame 3 by the lower edge of the rotating piece 4, thus locking the lock spring as shown in FIG. Rotation lock mechanism 1 by 9
0 is pushed in the locking direction (in the direction of the arrow in FIG. 9), the locking piece 7 of the rotating lock mechanism 10 fits into the locking hole 13 of the rotating piece 4, and the rotation of the rotating piece 4 is locked. .

[The problem that the idea aims to solve]

However, in the above-mentioned conventional structure, since the notch 14 must be provided in the lock hole 13 of the rotating piece 4, when a large torque is applied to the rotating piece 4 via the shaft rods 1 and 2 in the rotationally locked state, The rotating piece 4
There was a problem that the lock was deformed through the notch 14 and the lock hole 13.

[Means to solve the problem]

The present invention provides a bifurcated frame 23, which is provided with a lock through hole 31 and a guide through hole 31A on its side surface, and a lock hole 33 which is rotatably mounted within the bifurcated frame 23, as a means for solving the above-mentioned conventional problems. The rotating piece 24 is provided with a rotating piece 24, and the rotating lock mechanism 30 is attached to the bifurcated frame 23, and the rotating lock mechanism 30 slidably passes through the guide through hole 31A of the bifurcated frame 23. a lock rod 27 that is connected to the guide rod 27A via a connecting piece 27B and slidably fits into the lock through hole 31 of the bifurcated frame 23 and the lock hole 33 of the rotating piece 24.
and a lock spring 29 that urges the rotating lock mechanism 30 in the locking direction.Furthermore, a locking spring 32 that engages with the guide rod 27A is installed inside the bifurcated frame 23, and The movable piece 24 is provided with a protrusion 34 for pushing away the locking spring 32 to provide an articulation mechanism.

[Effect]

In the free state of the articulation mechanism, the locking spring 32 installed inside the bifurcated frame 23 locks the bifurcated frame 23.
It engages with the guide rod 27A of the rotation lock mechanism 30 passing through the guide through hole 31A, and prevents the rotation lock mechanism 30 from sliding in the locking direction. When the rotating piece 24 is rotated relative to the bifurcated frame 23, the protrusion 34 of the rotating piece 24 pushes away the locking spring 32 and locks with the guide rod 27A of the rotating lock mechanism 30. When the engagement with the spring 32 is released, the rotation lock mechanism 30 slides in the locking direction due to the biasing force of the lock spring 29, and the lock rod 27 passes through the lock through hole 31 of the bifurcated frame 23 to the rotation piece. 24, the rotation of the rotating piece 24 relative to the bifurcated frame 23 is locked, and the articulation mechanism becomes locked. When the guide rod 27A of the rotary lock mechanism 30 is pushed and the rotary lock mechanism 30 is slid in the opposite locking direction, the lock rod 27 escapes from the lock hole 33 of the rotary piece 24, and the rotary piece 24 becomes freely rotatable with respect to the bifurcated frame 23 again, and the articulation mechanism becomes free.

[Effect of idea]

Therefore, in the present invention, the rotation is automatically locked, which is particularly useful for gripping a wheelchair, and since there is no need to provide a notch in the lock hole of the rotation piece, the structure is extremely strong. A high articulation mechanism is provided.

〔Example〕

To explain the present invention with reference to an embodiment shown in FIGS. 1 to 6, a bifurcated frame 23 is provided at the tip of one shaft 21, and a rotating piece is provided at the tip of the other shaft 22. 24 is provided, and the rotating piece 24 is connected to the bifurcated frame 23.
It is rotatably mounted inside via a shaft 25. The rotating lock mechanism 30 includes a guide rod 27A having a head 28 attached to one end thereof, and a guide rod 27A having a head 28 attached to one end thereof.
The guide rod 27A is formed with a pair of engagement grooves 26, 26, and the rotating lock mechanism 30 is connected to the bifurcated frame. 23 via a guide rod 27A in a horizontally slidable manner and is biased in the locking direction (in the direction of the arrow in FIG. 2) by a lock spring 29. A lock through hole 31 through which the shaft 27 passes, a guide through hole 31A through which the guide rod 27A passes, and a shaft hole 31B that supports the shaft 25 are provided. A locking spring 32 is inserted into the guide through hole 31A via a pin 32A. On the other hand, the locking rod 2 of the rotating lock mechanism 30 is attached to the rotating piece 24.
A lock hole 33 into which the shaft 25 is inserted and a shaft hole 33A through which the shaft 25 passes are provided, and a protrusion 34 is provided from one edge.

In the above configuration, when the shaft rods 21 and 22 are in the bent state shown in dotted lines in FIG. 26,2
6 to prevent the rotary lock mechanism 30 from sliding in the locking direction. When the shaft rod 22 is rotated in the direction of the arrow in FIG. 3 from the above-mentioned bent state, the protrusion 34 of the rotating piece 24 pushes the locking spring 32 in the state shown by the solid line in FIG. 3, as shown in FIG. 4. Pushing away the locking spring 32, the engagement groove 26 of the guide rod 27A of the rotating lock mechanism 30,
26 and the locking spring 32 are released, and the rotation locking mechanism 30 is released from the locking spring 29.
Lock direction (direction of arrow in Figure 5) due to the urging force of
The locking rod 27 of the rotating locking mechanism 30
is fitted into the lock hole 33 of the rotating piece 24, and the rotating piece 2
4 is locked against rotation relative to the bifurcated frame 23. Furthermore, the head 2 of the guide rod 27A of the rotation lock mechanism 30
8 against the lock spring 29 to slide the rotary lock mechanism 30 in the opposite direction of the arrow in FIG. The stop spring 32 pushes the protrusion 34 of the rotating piece 24 to restore elasticity, and the engagement groove 2 of the guide rod 27A of the rotating lock mechanism 30 is closed.
6 and 26, and the rotary piece 24 becomes rotatable again.

Engagement grooves 26, 26 of guide rod 27A other than the present invention
Instead, a stepped portion may be formed and the locking spring 32 may be engaged with the stepped portion.

The articulation mechanism of the present invention is useful when applied to, for example, a handle 35 of a wheelchair, as shown in FIG. The handle 35 is removed from the bifurcated frame 23 in the usage state shown by the solid line.
By pressing the head 28 of the rotation locking mechanism 30, it can be rotated to the storage state shown by the dotted line, and when the storage state shown by the dotted line is changed to the usage state shown by the solid line, the rotation locking mechanism 30 is automatically activated again. Rotation is locked.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is an exploded perspective view, Figure 2 is a front view of the bifurcated frame, Figure 3 is a cutaway side view, and Figure 4 is a side view of the bifurcated frame. 5 is a front view of the wheelchair in the locked state, FIG. 6 is a partial perspective view of the wheelchair handle, and FIGS. 7 to 9 show the conventional configuration. 7 is a cutaway side view of the bent state, FIG. 8 is a cutaway side view of the side with the leaf spring pushed away, and FIG. 9 is a front sectional view of the locked state. In the figure, 23...bifurcated frame, 24...rotating piece, 26
...Engagement groove, 27...Lock rod, 27A...Guide rod, 27B...Connection piece, 29...Spring,
30... Rotating lock mechanism, 31... Lock through hole, 31A... Guide through hole, 32... Locking spring, 33... Lock hole, 34... Protruding portion.

Claims (1)

[Scope of utility model registration request] A bifurcated frame provided with a lock through hole and a guide through hole on the side surface, a rotating piece rotatably mounted within the bifurcated frame and provided with a lock hole, and a rotating lock attached to the bifurcated frame. The rotating lock mechanism consists of a guide rod that slidably passes through the guide through hole of the bifurcated frame, and a lock through hole of the bifurcated frame that is connected to the guide rod via a connecting piece. It consists of a lock rod that is slidably inserted into the lock hole of the moving piece, and a lock spring that biases the rotating lock mechanism in the locking direction, and a lock that engages with the guide rod within the bifurcated frame. An articulation mechanism characterized in that a spring is installed therein, and the rotating piece is provided with a protrusion that pushes away the locking spring.