JPS5936723Y2 - Cylinder - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a single-acting cylinder with a built-in spring.

<Prior Art> As shown in FIG. 1, in a conventional single-acting cylinder with a built-in spring, a piston 2 is slidably inserted into a cylinder body 1, and a piston rod 3 is attached to the piston 2.

A head cover 4 is provided on the piston 2 side of the cylinder body 1.
A rod cover 5 is provided on the piston rod 3, and a spring 6 is interposed between the rod cover 5 and the piston 2.

The cylinder chamber 7 on the right side in the figure of the piston 2 communicates with a supply/discharge port 9 via a passage 8 in the head cover 4 .

Problems to be solved by this invention Generally speaking, cylinders need to be regularly maintained and inspected, and during this inspection work, it is necessary to disassemble the cylinder to replace parts such as O-rings and backings.

However, in the conventional cylinder device having the above-mentioned configuration, when the cylinder is disassembled to replace parts such as O-rings and gaskets, the head cover 4 and rod cover 5 are damaged. Since the pressing force due to the spring force of the head cover 6 is constantly acting, there is a danger that the head cover 4, the rod cover 5, the piston 2, etc. may fly out.

For this reason, special tools are required to avoid this danger during disassembly work, and there are also problems in that separation and assembly take a long time.

Therefore, the present invention was developed in view of the above-mentioned problems, and allows the spring to contract, but restricts the expansion of the spring.When removing parts during cylinder disassembly, the spring force is applied to the parts. The technical challenge is to prevent it from acting as a force that pops out.

<Means for Solving the Problem> The means for solving the above technical problem is to form a locking part on the piston rod, to move between the locking part and the piston, and to engage the locking part. 1. Provide a spring seat that can be stopped. A spring is interposed between the second spring seat and the piston, and the locking portion and the piston are arranged so that the spring seat is in a position where the spring seat is in contact with or almost in contact with the locking portion when the cylinder is contracted. This is because the interval between

<Operation> According to the above means, when the spring seat is in contact with the locking part due to the spring, or when the cylinder is contracting in a liquid state, when the head cover and rod cover are loosened in order to disassemble the cylinder, the spring The catch comes into contact with the locking portion, and the spring is held between the spring catch and the piston.

Therefore, the spring force of this spring acts on the spring seat and piston, but it no longer acts on the double force bar, and even if the double force bar is removed from the cylinder body, it will not pop out, and the piston rod, piston, and spring retainer will not come out. The seat and spring can be removed as a unit from the cylinder body.

In this way, since the spring is held between the spring seat and the piston that are in contact with the locking portion, the spring force of the spring does not act as an ejecting force against both covers.

<Embodiment> The present invention will be described below based on an embodiment shown in FIGS. 2 and 3. A piston 11 is slidably inserted into the cylinder body 10, and a piston rod 1 is inserted into the piston 11.
Install 2.

A step 13 is formed on the piston rod 12, and a spring seat 14 movable in the axial direction of the piston rod is provided between the step 13 and the piston 11. A spring 15 is interposed between this spring seat 14 and the screws 1 to 11.

When the cylinder contracts due to this spring 15, the spring seat 14 is moved to a position where it almost contacts the stepped portion 13 (spring seat 1
4 may be in contact with the stepped portion 13.

), and is in contact with a stopper member 18, which will be described later.

On the other hand, at both ends of the cylinder body 10, a head cover 16 is provided on the piston 11 side, and a rod cover 17 is provided on the piston rod 12 side.

A cylindrical stopper member 18 is inserted between the rod cover 17 and the spring seat 14 to restrict movement of the spring seat 14 in the axial end direction of the piston rod, and the spring 15 The stopper member 18 is pressed against the rod cover 17 via the seat 14.

The cylinder chamber 19 on the right side in the figure of the piston 11 is a passage 20.
It communicates with the supply/discharge port 21 via.

Now, when pressure fluid is supplied from the supply/discharge port 21 in the state shown in FIG. When pressed, the piston 1 moves together with the piston rod 12 until the piston 11 comes into contact with the spring seat 14, resulting in the state shown in FIG. 3 (cylinder extended state).

Next, when the pressure fluid in the cylinder chamber 19 is discharged from the supply/discharge port 21 through the passage 20 from the state shown in FIG.
1 to the left in the figure is released, the piston 11 is pushed to the right in the figure by the repulsive force of the spring 15 together with the piston rod 12, and moves until it comes into contact with the head cover 16, resulting in the state shown in Figure 2. (cylinder contracted state).

When replacing parts such as OIJ rings and gaskets during cylinder maintenance and inspection work as described above, when removing bolts and nuts, and removing and disassembling the rod cover 17 and head cover 16 from the cylinder body 10, it is necessary to replace the bolts and nuts. When loosened, the spring seat 14 comes into contact with the stepped portion 13 of the piston rod 12 due to the repulsive force of the spring 15.
The spring 15 is held between the spring seat 14 and the piston 11, and the rod cover 17 and head cover 16
The spring force of spring 15 does not act on.

Therefore, there is no danger that the rod cover 17 and head cover 16 will pop out due to spring force, and there is no need to use special tools, and they can be removed easily and quickly.

After that, the piston rod 12, the piston 11 and the spring seat 1
4 and the spring 15 as one body and replace parts such as O-rings and gaskets.In addition, in the embodiment shown in FIG.
A cylindrical stopper member 18 is provided between the spring seat 14 and the spring seat 14 to restrict the movement of the spring seat 14 toward the end of the piston rod axis. The spring seat 14 and the stopper member 18 are integrated to form a spring seat 31, and the spring seat 31 itself is brought into contact with the rod cover 17 in the direction of the piston rod axis end (leftward in the figure).
The stopper member 18 may be configured to restrict movement to the rod cover 17 or the cylinder body 10.
It may be integrally molded with the rod cover, or the rod cover itself may also be used as a member of the stopper.

That is, when the cylinder is operated, the spring seat 14.31 is prevented from moving to the left in the figure, and the piston 11 moves to the left in the figure together with the piston rod 12 while compressing the spring 15 (cylinder expansion state). .

In addition, in the embodiment shown in FIG.
3 has been described, however, as shown in the embodiment shown in FIG. 4, a convex portion may be formed on the piston rod 12 using a pin 32.

That is, when disassembling the cylinder, the pin 32 and the spring seat 14 or 31 are engaged, the spring 15 is held between the spring seat 14 or 31 and the piston 11, and the head cover 16 or rod cover 17 is It is a good idea to take measures to prevent the spring force from acting.

Therefore, it is only necessary to form a locking portion such as a stepped portion 13 or a pin 32 on the piston rod 12 to lock the spring seat 14 or 31 (this is not limited to the embodiment).

<Effects> According to the present invention, a locking portion is formed on the piston rod 12,
A movable spring seat is provided between this locking part and the piston, and the spring is interposed between this spring seat and the piston, so when the cylinder is disassembled, the spring seat is moved to the locking part. The spring force acts on the spring seat and piston, but not on the head cover and rod cover, so it can be disassembled safely, easily, and quickly without using special tools. It is extremely useful industrially.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a conventional cylinder, Fig. 2 is a schematic sectional view showing an embodiment of the cylinder of the present invention, Fig. 3 is an explanatory view showing the operating state of Fig. 2, and Fig. 4 is a schematic sectional view showing an embodiment of the cylinder of the present invention. FIG. 3 is a schematic cross-sectional view showing another embodiment of the cylinder of the present invention. 10... Cylinder body, 11... Piston, 12... Piston rod, 13...
...Stepped part (locking part) 14... Spring seat, 15.
...Spring, 16 ...Head cover, 17
...Bent rod cover, 31...Spring catch, 31
...Pin (locking part).

Claims (1)

[Scope of utility model registration request] A locking portion is formed on the piston rod, a spring seat is provided that is movable between the locking base r and the piston, and is capable of being engaged with the locking portion, and the spring seat is arranged between the spring seat and the piston. A spring is interposed therebetween, and the spacing between the locking part and the piston is set so that the spring seat is in a position where the spring abuts or almost contacts the locking part when the cylinder contracts. cylinder.