JPS6332869Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a door opening/closing device that opens and closes a door using fluid pressure.

Conventionally, as shown in FIG. 1, this type of device includes a cylinder body 1 having a cylinder hole 1a inside, and a rod 2 movably inserted into the cylinder hole 1a and protruding from one end of the cylinder body 1.
Piston 2 connected to a door (not shown) via a
and at least one pressure chamber A or B defined within the cylinder hole 1a by the piston 2,
At one end side, the rod 2a is inserted through the support fitting 3.
A shaft-like member 4 that is integrally supported by and movably extends to the side of the cylinder body 1, a cam portion 4a formed on the other end side of the shaft-like member 4, and the above-mentioned one end of the cylinder body 1. There is a device which is equipped with a limit switch 5 fixed to the side, and the limit switch 5 is switched by a cam part 4a when the door is completely closed, that is, when the rod 2a moves forward by the maximum stroke L in the direction of the arrow shown in the figure. This door opening/closing device is for a folding door type door, and a cylinder body 1 is swingably supported by a vertical shaft 6 at its support portion 1b. 7 is a bellows-shaped boot.

However, in this conventional device, since the cam portion 4a is formed by simply reducing the diameter of the tip of the shaft-like member 4, the shaft-like member 4 and the support member 1
Even if an attempt is made to detect the full stroke point of the piston 2 in order to interfere with the shaft-like member 4
Since it is not possible to make the length sufficiently long, the limit switch 5 is actuated just before the full stroke. For this reason, it is conceivable to make the roller 5a of the limit switch 5 a special shape so that it comes into contact with the cam part 4a at the full stroke position, or to change the installation position of the limit switch 5. If it is provided in a protruding manner, interference with the boot 7 may occur, or the amount of protrusion from the cylinder body 1 will increase, resulting in problems of interference with other members. In particular, this becomes a serious problem when the cylinder body 1 swings about the vertical axis 6.

The present invention was created in view of the above-mentioned problems, and aims to provide a door opening/closing device that can accurately measure and detect the stroke to be measured while avoiding interference with other members, and to achieve this purpose. The cam portion includes a cam member slidably fitted to the other end of the shaft member, and a spring biasing the cam member toward the other end. A portion is formed that extends beyond the other end when the other end is biased by the spring.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 8 denotes a shaft-shaped member which is cantilever-supported by the rod 2a on the outside of the cylinder body 1 by the support fitting 3 so as to extend from the rod 2a side toward the support portion 1b side. It moves integrally with the rod 2a. The end portion of the shaft-like member 8 on the support portion 1b side is formed to have a smaller diameter than the other portion, and this narrow diameter portion 8a has a
A cam member 9 that cooperates with the spring 10 to constitute a cam portion is movably but unremovably fitted onto the outside, and the cam member is attached to the tip of the narrow diameter portion 8a by the spring 10 fitted into the narrow diameter portion 8a. Stoppa 1 in
The piston 2 in the cylinder body 1 has completed its backward movement, and is in the illustrated state. Here, it is separated from the stopper 11 and pushed back toward the stepped portion 8c by a distance l by the support portion 1b of the cylinder body 1 against the elasticity of the spring 10. The cam member 9 has a diameter d larger than the diameter of the shaft member 8, and has a cam surface 9a on the stepped portion 8c side.
is formed. As shown in FIG. 3A, the limit switch 5 has its roller 5a spaced apart from the shaft-like member 8 in the radial direction of the shaft-like member 8 by less than half the outer diameter difference between the shaft-like member 8 and the cam member 9. It is arranged so that it separates the

Therefore, while the piston 2 moves forward in the direction of the arrow in the figure and the shaft member 8 moves in the same direction, the cam surface 9a of the cam member 9 does not come into contact with the roller 5a until it engages with the roller 5a of the limit switch 5. There's nothing to do.

Further, even if the shaft member 8 moves as described above, the cam member 9 remains in pressure contact with the support portion 1b until the piston 2 moves by a distance l, and the cam member 9 remains in pressure contact with the support portion 1b.
When a moves by a distance l, it separates from the support portion 1b, and thereafter moves integrally with the shaft-like member 8.

Therefore, from the time when the cam member 9 starts integral operation with the shaft-like member 8, the piston 2 moves through the remaining stroke (L
The length of the shaft-like member 8 and the shaft-like member of the cam member 9 are such that the cam member 9 engages with the roller 5a and operates the limit switch 5, as shown in FIG. If the relative movement distance with respect to 8 is determined, the limit switch 5 can be operated by the cam member 9 when the piston 2 has finished moving the maximum stroke L. vice versa,
When the piston 2 moves back, the cam member 9 comes into contact with the support member 1b when the piston 2 and the shaft member 8 move by a stroke (L-l) in the opposite direction to the above, and the piston 2 moves the rest of the stroke. While the shaft-like member 8 moves, the cam member 9 remains stationary.

As described above, in this embodiment, the distance between the limit switch 5 and the support portion 1b is substantially increased by the relative movement distance due to the cam member 9 moving relative to the shaft member 8. As,
A cam member of sufficient size can be used to ensure stable and reliable switching operation of the limit switch 5, to have high durability, and to provide a structure that is easy to install.

FIG. 4 shows another example of the cam member 9, which has a hole 9b into which the spring 10 is inserted, and which is placed over the end of the shaft member 8 including the entire narrow diameter portion 8a. ing.

As described above, according to the present invention, since the cam member that is slidably fitted to the shaft-like member is used, even if the installation space has a conventional length, the shaft-like member can be moved easily by the relative movement of the two. It has the same effect as when the length of is increased, and the stroke to be measured or the full stroke can be reliably detected.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of a conventional door opening/closing device in cross section, FIG. 2 is a side view showing a part of an embodiment of the door opening/closing device according to the present invention in cross section, and FIG. , a diagram for explaining the positional relationship of the limit switches in the above embodiment, FIG. 3B is a diagram for explaining the operation of the above embodiment, and FIG. FIG. 1...Cylinder body, 1a...Cylinder hole, 2
... Piston, 2a ... Rod, 5 ... Limit switch, 5a ... Roller, 8 ... Shaft-like member, 8
a...Small diameter portion, 9...Cam member, 9a...Tapered surface, 10...Spring, 11...Stopper.

Claims (1)

[Scope of utility model registration request] A cylinder body having a cylinder hole inside, a piston movably inserted into the cylinder hole and connected to the door via a rod protruding from one terminal of the cylinder body, and a cylinder formed in the cylinder hole by the piston. a shaft member integrally attached to the rod at one end side and movably extending to the side of the cylinder body; and a cam provided at the other end side of the shaft member. and a limit switch attached to one end of a cylinder body and operable by the cam, the cam being slidable toward the other end of the shaft member. It has a fitted cam member and a spring that biases the cam member toward the other end,
A door opening/closing device, wherein the cam member is formed with a portion that extends beyond the other end when the cam member is on the other end side biased by the spring.