JPH08147Y2 - Mechanism for avoiding the linear state of the load suspension arm - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing a pair of links from being in a linear state in a load suspension arm composed of a pair of links flexibly connected to each other.

[0002]

2. Description of the Related Art Conventionally, a load suspension arm 10 of this type (see FIG.
Is a part of the load suspending / moving device 11, and the first link 13 rotatably provided on the column 12 and the second link 14 for suspending the load W are flexibly connected to each other. It is structured. However, this load suspension arm 1
0 is a pair of links 13 and 14 when in a straight state
(See FIG. 7), in order to move the load W toward the support 12, the links 13, 14 are in the longitudinal direction (direction of arrow A in FIG. 7).
It has a problem that it cannot be bent even when pressed against. Therefore, as a measure against such a problem, there is a linear state avoiding mechanism that prevents the pair of links 13 and 14 from being in a linear state. As shown in FIG. 8, the linear state avoidance mechanism 17 includes a pair of links 13, 14
A pair of stoppers 15 and 16 that are in contact with each other
Consists of

[0003]

However, since the linear state avoiding mechanism 17 regulates the bending angle of the second link with respect to the first link, the linear state avoiding mechanism 17 is different from the pair of links 13 and 14 in the straight state when the load is reduced. There is another problem that the entire length of the suspension arm 30 is shortened by L in FIG. Further, since the straight-line state avoiding mechanism 17 regulates the bending angle of the second link with respect to the first link, as shown in FIG. 9, when the load suspension moving device 11 is installed on the wall S, for example. However, there is also a problem that the load can be moved only within the range indicated by the diagonal lines in FIG. 9, and the load moving range of the load suspension moving device 11 is narrowed.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a link is flexibly connected to each other and a load is hung on one link and the other is hung.
In a load suspension arm having a pair of links rotatably attached to a column, when the pair of links are in a bent state, the convex and concave cam surfaces mesh with each other by a pressing urging force , and in a linear state, the convex and concave cam surfaces Pushes against each other
The above problem is solved by a linear state avoiding mechanism that includes a pair of sliding convex-concave cam members that are biased to slide in the meshing direction by a force at the connecting portion of the pair of links.

[0005]

Since the pair of sliding cam members are provided in the pair of links, they rotate with each other as the pair of links bends. During this rotation, the pair of sliding projections
In the concave cam member, the convex and concave cam surfaces completely mesh with each other when the pair of links has a bending angle due to the pressing biasing force . However, the pair of cam members at other than the bending angle is disengaged from each other due to the engagement of the concave and convex cam surfaces as the link is bent.
Eating crossing difference in the stomach. At this time, one cam member
The other cam member pushes against the pressing force and escapes.
Therefore, the arm that suspends the load rotates without being restricted by the rotation angle. Moreover, the relief cam member is pressed against me by the urging pressure that by the elastic body to the other of the cam member, and, by the guide of the sliding cam surface, sliding in an attempt to mesh with the cam surface of the other of the cam member, A rotational force is generated between the other cam member. Therefore, even if the pair of links is bent in a straight line state, the link that suspends the load is naturally rotated by the rotational force, and becomes a bent state with respect to the other link. Is avoided.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The load suspending arm 30 constitutes, for example, a part of a load suspending movement device as shown in FIG. 6, and can suspend a load. The load hanging arm 30 (see FIG. 1) includes a first link 31 and a second link 32.
The first link 31 is rotatably provided on a column of the load suspension moving device. The second link 32 is a link for suspending a load. The first and second links 31, 32 are the first link 3
The pair of bearings 33, 33 included in 1 and the shaft 34 integrally included in the second link 32 are flexibly connected to each other. First and second links 3
A linear state avoidance mechanism 40 is provided at the connecting portion 35 of the cables 1, 32.

The linear state avoiding mechanism 40 includes a sliding convex cam member 41, a sliding concave cam member 42, and both cam members.
It is composed of a coil spring (elastic body) 43 for pressing and urging, and a rotation stopping means 44. Sliding convex cam member 4
Reference numeral 1 is a semi-cylindrical portion formed at the tip of the shaft 34. The sliding concave cam member 42 is a U-shaped portion formed at the tip of the shaft 48. The shaft 48 is axially movably provided on the first link 31 by a ring-shaped guide plate 45, and is biased in one direction by a coil spring 43. The rotation stopping means 44 is the guide plate 4
5, and claws 46, 46 formed on the shaft 5, and grooves 47, 47 formed in the outer peripheral axial direction of the shaft 48. The claw 46 and the groove 47 are engaged with each other, and the sliding concave cam member 42
Of the sliding convex cam member 41 is assured. The pair of sliding concavo-convex cam members 42, 41 are adapted to be completely meshed with each other when the pair of links 31, 32 have a bending angle α (see FIG. 3).

Next, the operation will be described. The second link 32 is
An operator bends the first link 31 to suspend or load the load. At this time, everything
The convex cam member 41 also rotates integrally with the second link 32.
Sliding convex cam member 41 is co according to the shape of the uneven cam surface sliding the sliding concave cam member 42 which is rotation stop
It rotates while pushing down against the urging force of the il spring (see Fig. 4). The sliding concave cam member 42 is used for the second link 3
All according to 2 leaves the position in the bending angle α
Ri goes off the convex cam member 41, sliding convex cam member 4
If it deviates by 90 degrees or more with respect to 1, the tips of the cams 411,
421 is in contact, become the most out of the Kui difference cross state.
(See Figure 5). Therefore, the second link 32 is the first link 3
It is possible to freely rotate without limiting the bending angle with respect to 1.

During the bending of the second link 32, it is prevented from rotating.
In the state shown in FIG. 4, the sliding concave cam member 42 is pressed against the sliding convex cam member 41 by the coil spring 43.
Runode, convex sliding by the sliding guide of the concave-convex shape of the cam
The cam member 41 receives the rotational force and meshes with the sliding concave cam member 42 to try to settle. Therefore, even if the bending of the second link 32 is stopped in a straight line with respect to the first link 31, the second link 32 rotates together with the sliding convex cam member 41 , and the bending angle of the angle α with respect to the first link 31. Make a stop. Therefore, the linear state of the load hanging arm 30 is avoided, and depending on the direction in which the load is pushed, the pair of links 31, 3
The fact that 2 cannot bend is eliminated. Moreover, when moving the load, the pair of links 31,
Since 32 can be formed in a straight line, the entire length can be made longer by a length of L in FIG. 9 than in the conventional case, and the movement range of the load can be widened. Further, when the load suspending / moving device is installed near a wall as shown in FIG. 9, for example, the load suspending arm 30 can move the load to the entire range surrounded by the outermost arc 50 in FIG. I can .

[0010]

According to the linear state avoiding mechanism of the present invention, since the linear state of the load hanging arm can be avoided, the load hanging arm can be bent no matter what direction it is pushed. You can Further, since the load suspending arm can be rotated even if the entire load suspending arm is in a straight line state, the load moving range can be expanded.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along a shaft of a load suspending arm having a linear state avoiding mechanism of the present invention.

FIG. 2 is an exploded perspective view of the linear state avoiding mechanism of the present invention.

3A and 3B are schematic diagrams for explaining the operation of the linear state avoidance mechanism, where FIG. 3A is a front view and FIG. 3B is a plan view.

4A and 4B are schematic diagrams for explaining the operation of the linear state avoidance mechanism, where FIG. 4A is a front view and FIG. 4B is a plan view.

5A and 5B are schematic diagrams for explaining the operation of the linear state avoidance mechanism, in which FIG. 5A is a front view and FIG. 5B is a plan view.

FIG. 6 is a front view of the load hoisting and moving device.

FIG. 7 is a schematic plan view of FIG.

FIG. 8 is a plan view of a conventional straight line state avoiding mechanism.

FIG. 9 is a diagram showing an operation range of a load suspending arm when a load suspending movement device having a conventional linear state avoiding mechanism is installed near a wall.

[Explanation of symbols]

30 Lifting Arm 31 First Link 32 Second Link 35 Connecting Part 40 Straight State Avoidance Mechanism 41 Sliding Convex Cam Member 42 Sliding Recessed Cam Member 43 Coil Spring (Elastic Body)

Claims (1)

[Scope of utility model registration request] 1. A link is flexibly connected to each other and a load is suspended on one of the links, and the other link is rotatably mounted on a column.
In a load suspension arm having a pair of attached links, when the pair of links are in a bent state, the convex and concave cam surfaces push each other.
Uneven cam surface when meshed by pressure urging force and straight
Crosses each other and slips in the meshing direction due to the pressing force.
A straight state avoiding mechanism for a load suspended arm, comprising a pair of slidingly- concave cam members that are biased at a connecting portion of the pair of links.