JPH0214668Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a rod stopping device, and more specifically to a device for stopping a rod that moves in the axial direction, such as a piston rod of a fluid pressure cylinder, at a desired position. Regarding equipment suitable for.

(b) Prior Art A conventionally known cylinder stop device has a structure shown in FIGS. 4 and 5.
In this device, a piston rod c fixed to a piston b of a cylinder a is eccentrically provided with a cylindrical casing d surrounding the piston rod, and a brake shoe e divided symmetrically into two is inserted into the casing d. , inserting the piston rod into the insertion hole defined by the brake shoe e,
An arm f is fixed to each brake shoe, and the arm is made to protrude outside through a window g formed in the casing d, and the arm is biased in the direction of pushing it open to apply a braking force to the piston rod, and vice versa. The brakes are released by biasing the brakes toward each other.

However, in such conventional devices, precision machining is required to make the piston rod eccentric to the piston rod, and to allow the inner peripheral surface to slide against the piston rod and the outer peripheral surface against the casing without play, and also to be prone to wear. However, this brake shoe had the disadvantage that it could not be adjusted.

(c) Problems to be solved by the invention The problem to be solved by the invention is to create a rod stopping device that does not necessarily require high machining accuracy and can be easily adjusted for brake shoe wear. It is to be.

(d) Means for Solving the Problems The present invention provides a substantially cylindrical brake shaft that is divided into two parts and has a rod insertion hole that is eccentric with respect to the axis of the cylindrical casing. In the rod stopping device in which the rod is movably disposed in the insertion hole, each of the divided brake shoes is formed with a notch part biased to one side, and a notch part is formed in each of the divided brake shoes. A brake shoe piece that can come into contact with the inner surface of the rod and the casing is installed in a position adjustable manner with respect to the brake shoe, and each brake shoe is provided with the brake shoe piece in the circumferential direction of the insertion hole. An adjustment screw for pressing is attached, and each brake shoe is provided with an arm that protrudes outside the casing.

(e) Operation In the above configuration, when the arms are biased toward or away from each other, a brake force is applied to or released from the rod by the brake shoe, and the movement and stopping of the rod can be controlled.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1-3, a cylinder is shown equipped with an embodiment 10 of a rod stop device according to the present invention. In the same figure, 1 is a cylinder,
2 is a cylinder tube, 3 is a head cover that closes one end of the cylinder tube, and 4 is a rod cover that closes the other end of the cylinder tube. A piston (not shown) of a known structure is movably provided in the cylinder tube 2, and a piston rod 5 (FIG. 1) extending through a rod cover 4 is attached to the piston in a known manner. ing.

The rod cover 4 includes a hollow cylindrical casing 11 that defines a cylindrical chamber 12 of the rod stopper 10.
are integrally attached.

Inside the cylindrical chamber 12 of the casing 11 are two cylindrical brake shoes 15, 15a, 15.
b has been inserted. This brake shoe 15 has grooves 16, 16 with an arcuate cross section that form an insertion hole 17 for a piston rod at a position eccentric to the axis of the cylindrical chamber (therefore, the axis of its outer circumference).
a, 16b are formed.

Each brake shoe 15 has a notch 19 cut out from approximately half of the groove 16 on both sides of the central bracket portion 18. A brake shoe piece 20 having substantially the same cross-sectional shape as the notch is arranged in each notch. These brake shoe pieces 20 are fixed to the brake shoe 15 by a plurality of setscrews 22 that are inserted into a plurality of screw holes 21 formed through the brake shoe pieces 20 in the axial direction and are screwed into the bracket portion 18. has been done. The screw hole has an elongated cross section so that the position of the brake shoe piece relative to the brake shoe can be adjusted.

The outer periphery of the bracket part of each brake shoe and the inner periphery defining the insertion hole are slightly recessed from the main body part, so that the outer periphery of the bracket part does not contact the inner surface of the housing 11 and the inner periphery does not contact the outer surface of the piston rod. It's getting old.

A projection 23 extending in the axial direction of the brake shoe is formed at the end (upper end in FIG. 3) of the bracket 18, and an adjustment screw is installed in the projection to press the brake shoe piece and adjust the position. 24 is attached.

Each brake shoe 15a, 15b is integrally formed with two arms 26, 27 that extend substantially parallel to the dividing line and in mutually opposite directions. This arm is adapted to project outwardly when placed within the housing 11 through windows 13 and 14 provided at diametrically symmetrical locations in the housing.

A brake spring 31 is disposed between one arm member (the one farthest from the groove) of the two brake shoes 15a and 15b, and a brake spring 31 is disposed between the other arm member to push the arm to spread the brake shoes apart, for example. An actuating device 41 such as a fluid pressure cylinder is provided.

The spring receiver 32 that receives one end of the spring 31 is
6a so that its position can be adjusted, and the strength of the spring can be adjusted by rotating it.

In the above configuration, the arm 27 of the pair of brake shoes 15a, 15b is activated by operating the actuating device 41.
When you push the keys away from each other, brake shoe 1
Due to the shape of 5a, 15b, they are slightly separated from the piston rod 5, so that the piston rod can move freely.

Next, when the operation of the actuating device is stopped and the pressure on the arm 27 is released, the arm 27 opposite to the arm 27
Due to the action of the spring acting on the brake shoe 15
The brake shoe piece 20 is pressed against the piston rod 5, and a braking force is applied to the piston rod. Therefore, the piston rod can be stopped at will by operating the actuating device.

When adjusting the position of the brake shoe piece 20 with respect to the brake shoe 15, loosen the set screw 22, turn the adjustment screw 24 to push the brake shoe piece 24, and then tighten the set screw 22. Bye.

Note that the positions of the spring and the actuating device may be reversed so that the brake is applied when the actuating device is operated, or the arm may be opened and closed by other known means.

(g) Effects As described above, in this invention, the brake shoe piece is attached to each brake shoe so that its position can be adjusted, so there is no need to increase the machining accuracy of the brake shoe piece as in the past, and it also reduces wear. Adjustment can be made easily.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a cylinder equipped with an embodiment of the rod stopping device according to the present invention, Fig. 2 is a sectional view taken along the line - of Fig. 1, and Fig. 3 is a perspective view of the brake shoe. 4 and 5 are views showing a conventional cylinder with a stop device. 10: Stop device, 11: Casing, 12: Cylindrical chamber, 15: Brake shoe, 20: Brake shoe piece.

Claims (1)

[Scope of utility model registration request] A substantially cylindrical brake shoe is disposed within the cylindrical casing, which is divided into two parts and has a rod insertion hole that is eccentric with respect to the axis of the casing, and the rod is movably arranged within the insertion hole. In the rod stopping device, each of the divided brake shoes is formed with a cutout part biased to one side, and the cutout part has a brake shoe that can come into contact with the inner surface of the rod and the casing. The pieces are attached so as to be adjustable in position with respect to the brake shoe, each brake shoe is provided with an adjustment screw for pressing the brake shoe piece in the circumferential direction of the insertion hole, and each brake shoe is provided with an arm. A stopping device for a rod, characterized in that a rod is provided and the arm protrudes outside the casing.