JPH1137111A - Stopping device for straight cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive stopping device for a straight cylinder, which can be manufactured easily. SOLUTION: In a stopping device, a thin-walled brake shoe 7, which is provided with one or more slits, is placed around a piston rod 5 to be stopped of a straight cylinder C, while the piston rod 5 can be locked by arranging the thin-walled brake shoe 7 in a casing 6 as the shoe 7 is involved in an expanded elastic body 2 having a U shape. A pair of rollers are arranged in one piece of a supporting case and inside the both end parts of the U-shaped elastic body 2. To release the brake lock, a tapered part of the piston 4 having the tapered part is pressed into a space between the pair of rollers, thereby further expanding the U-shaped elastic body 2 already expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear cylinder stopping device for locking and stopping a piston rod of a linear cylinder at an arbitrary position, and more particularly to a small, easy-to-manufacture and inexpensive linear cylinder stopping device.

[0002]

2. Description of the Related Art In general, a method of locking a piston rod with its frictional force by pinching or gripping a piston rod is generally used for a linear cylinder stop device. There is a core intensification type, a strain stress type, and the like. The eccentric stress type rotates a pair of brake members having a rotation center at a position eccentric with respect to the axis of the piston rod in directions opposite to each other, and the eccentricity thereof. This is a linear cylinder stop device in which the spring force is increased by the ratio of the distance and the distance from the rotation center to the point of application of the spring of the brake force generation source.

In the strain stress type, a brake member having an inner diameter slightly smaller than the outer diameter of the piston rod is expanded and inserted into the piston rod, and an opening parallel to the axial direction of the piston rod is formed in the brake member. This is a linear cylinder stop device that releases the brake lock by pushing and spreading it.

[0004]

However, the eccentric booster has a pair of brake members having a rotation center at a position eccentric to the axis of the piston rod, a spring for generating a braking force, and a brake lock. However, since the actuator is configured to be larger than the accompanying cylinder and requires eccentric processing, there is a problem that high processing accuracy is required and manufacturing cost is increased.

Further, the strain stress type is a soft material which does not damage the sandwiched piston rod since the strain stress generating member for generating the braking force and the member for sandwiching the piston rod are the same. In addition, it is necessary to select a member having a certain fixed elastic coefficient in the design calculation. However, the expanded dimension when the brake lock is released with respect to the outer diameter of the piston rod is increased (0.05 m).
m or more), it is difficult to select a member, and when wear occurring during use progresses, it is necessary to replace all of the brake members.

[0006]

In order to achieve the above object, a structural feature of the present invention according to the first aspect is that a thin brake shoe having one or a plurality of slits is externally inserted into the piston rod. And a case in which the piston rod is locked by being enclosed in the expanded U-shaped elastic body, and a pair of rollers is supported by a coil spring inside both ends of the U-shaped elastic body. A piston having a tapered expansion portion is provided in parallel with the axial direction of the piston rod so as to be rotatable and movable, and both side surfaces of the tapered expansion portion contact between the rollers. Is arranged so as to further push the piston to further expand the expanded U-shaped elastic body and release the brake lock, and a brake friction member;
That is, the braking force generating member is separated.

[0007]

The operation and effect of the present invention are configured as described above.
In the invention according to the present invention, since the member that sandwiches the piston rod and the member that generates the braking force are different, it is possible to select a member under optimum conditions, and also to increase the expansion dimension when the brake lock is released. (0.1
(approximately mm), making it easy to assemble and manufacture, making it possible to reduce the size at a low cost, and to cope with wear occurring during use only by replacing consumable parts of an inexpensive thin brake shoe.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 schematically show a linear cylinder stopping device according to an embodiment of the present invention. The linear cylinder stopping device B is externally inserted into the piston rod 5 of the linear cylinder C as shown in FIG.

The linear cylinder stop device B has an inner diameter slightly larger than the outer diameter of the piston rod 5 and moves the brake rod 7 having one or more slits in the axial direction of the piston rod 5 to the piston rod 5. With the structure in which the U-shaped elastic body 2 is expanded and the brake shoe 7 is included,
In the casing 6, a brake shoe 7, a U-shaped elastic body 2, a piston 4, a piston packing 4a, a pair of rollers 1, a case 3, a coil spring 3a, and a coil spring 4c are incorporated.

Next, the operation of the linear cylinder stopping device configured as described above will be described. A brake shoe 7 having an inner diameter slightly larger than the outer shape of the piston rod 5 is included in the expanded U-shaped elastic body 2 and is supplied to an air supply port 6a of a linear cylinder stop device B assembled to the cylinder C. Then, when pressurized air for releasing the brake is applied, the tapered portion 4b of the piston 4 is pushed between the pair of rollers 1, and the pair of rollers 1 pushes and expands both ends 2a of the U-shaped elastic body 2. As a result, the U-shaped elastic body 2 is further expanded, the inner diameter of the brake shoe 7 becomes an initial state larger than the outer diameter of the piston rod 5, and the brake is released. When pressurized air is exhausted from the air supply port 6a of the linear cylinder stop device B, the piston 4
Is moved by the coil spring 4c, and the tapered portion 4b of the piston 4 also escapes from between the pair of rollers 1 moved together with the case 3 by the coil spring 3a. Therefore, the push-up is applied to both ends 2a of the U-shaped elastic body 2. The force disappears, and the U-shaped elastic body 2 reduces the diameter of the brake shoe 7 contained therein and tightens the piston rod 5 to apply a brake.

As described above, in the linear cylinder stopping device according to the present embodiment, since the member for sandwiching the piston rod and the member for generating the braking force are different, the optimum members can be respectively selected. In addition, since the inner diameter of the brake shoe at the time of releasing the brake can be made large, assembly is easy and the manufacturing cost can be reduced, and the life of the product can be extended by replacing consumable parts.

[0012]

[Brief description of the drawings]

FIG. 1 is a sectional view of a linear cylinder stopping device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II of the linear cylinder stopping device.

FIG. 3 is a part of a view seen from a II-II section of the linear cylinder stopping device.

FIG. 4 is a view in the direction of line III-III in FIG. 3;

[Explanation of symbols]

1: roller, 2: U-shaped elastic body, 3: case,
4: piston, 5: piston rod, 6: casing, 7: brake, B: linear cylinder stopper, C: linear cylinder

Claims (1)

[Claims] 1. A thin-walled brake shoe having one or a plurality of slits in the axial direction of a piston rod of a linear cylinder is externally inserted into the piston rod and is expanded.
A pair of rollers are provided in one case inside the both ends of the U-shaped elastic body, and are provided in parallel with the axial direction of the piston rod in a rotatable and movable state. A piston having a tapered expansion is disposed between the rollers such that both side surfaces of the tapered expansion are in contact with each other;
A linear cylinder stop device configured to further expand the U-shaped elastic body expanded by pushing the piston and release a brake lock via the thin brake shoe.