JPS6157512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover fixing method for fixing a cylinder cover to a cylinder tube in a cylinder of the type in which the cylinder cover is fitted inside or outside the open end of the cylinder cover to close the opening. .

Conventionally, in this type of cylinder, in order to fit the cylinder cover onto the cylinder tube and prevent it from coming off, the cylinder cover and cylinder tube had to be provided with male and female threads, respectively, and these were screwed together. As is known from Publication No. 48-14117, an annular groove is provided on the outer circumferential surface of the cylinder cover and the inner circumferential surface of the cylinder tube, and the cylinder cover is flexible when inserted into the cylinder tube while being rotated. A long, slender key is inserted into a double-concave groove.

However, this fixing method has the disadvantage that the cylinder cover rotates inadvertently with respect to the cylinder tube, and it is also troublesome to assemble and disassemble them.

The present invention proposes a method for fixing a cylinder cover that can easily prevent the cylinder cover from being removed from the cylinder tube and prevent it from rotating using the same mechanism, and can also easily assemble and disassemble the cylinder cover. be.

That is, in the method of the present invention, in a cylinder in which a cylinder cover is fitted inside or outside the open end of the cylinder tube, the open end and the cylinder cover that is located inside is provided with an annular shape on the outer peripheral surface. In addition to providing an outer keyway, a screw hole is provided at a predetermined position of this outer keyway, and on the other hand, an annular inner keyway is provided on the inner peripheral surface of the outer keyway. A penetrating hole is provided at a predetermined position of the
A male screw is inserted into the screw hole, and a ring key having a notch is inserted into the outer key groove, and the open end and the cylinder cover are inserted so that the outer key groove and the inner key groove of both coincide. Rotation of the cylinder cover relative to the cylinder tube is restricted by fitting the cylinder cover all the way to the end, and screwing the male screw outward into the screw hole so that the head of the male screw protrudes into the hole through the notch. At the same time, the ring key is pushed open by the threading of the male screw and fitted into both the outer key groove and the inner key groove, thereby preventing the cylinder cover from being removed from the cylinder tube. .

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

This cylinder is of a type in which a cylinder cover 2 is fitted inside the open end of a cylinder tube 1, and the cylinder cover 2 has one end thereof narrowed in diameter and serves as a fitting part 3 which is fitted into the cylinder tube 1. There is. Then, an annular outer keyway 4 is formed on the outer peripheral surface of the fitting part 3, and a screw hole 5 is formed at a predetermined position of the outer keyway 4.
has been established.

On the other hand, at the open end of the cylinder tube 1, an annular inner key groove 6, which is shallower than the outer key groove 4, is formed on the inner peripheral surface thereof, and a hole 7 passes through the inner key groove 6 at a predetermined position. is provided.

Therefore, in order to assemble the cylinder tube 1 and cylinder cover 2, as shown in FIG.
Insert the male screw 8 into the screw hole 5 in advance and tighten the screw hole 5.
At the same time, a ring key 9 having substantially the same depth and thickness is fitted into the outer key groove 4 and is then sunk into the outer key groove 4.

The male screw 8 has an unthreaded truncated conical shoulder 8a and an unthreaded circular head 8b with a narrow diameter, and a groove 8c for a screwdriver is formed on the upper surface of the head 8b. is formed.

The ring key 9 has a notched annular shape that is interrupted at a notch 9a, and the ring can be expanded.The ring key 9 is fitted into the outer key groove 4 with the notch 9a aligned with the screw hole 5.

Then, the fitting part 3 of the cylinder cover 2 is fitted into the open end of the cylinder tube 1 to align the outer key groove 4 and the inner key groove 6 with each other as shown in FIG. 7 and 7 are aligned with each other, and by hooking a screwdriver to the groove 8c of the male screw 8 through the hole 7 and the notch 9a and screwing the male screw 8 outward, the shoulder 8a of the male screw 8 is inserted into the notch of the ring key 9. Push out the notch 9a to enlarge the ring of the ring key 9, and insert the ring key 9 into the outer key groove 4 and the inner key groove 6 as shown in FIGS.
and the head 8b of the male screw 8 is positioned in the hole 7.

Thus, the cylinder cover 2 is prevented from being removed from the cylinder tube 1 because the ring key 9 is fitted into both the outer key groove 4 and the inner key groove 6, and the head 8b of the male screw 8 is Rotation is restricted by being located in the hole 7.

Note that the reference numeral 10 in the figure is a piston rod.

In the above embodiments, the present invention is applied to a cylinder in which the cylinder cover 2 is fitted inside the open end of the cylinder tube 1, but it may also be applied to a cylinder in which the cylinder cover 2 is placed over the outside. In this case, contrary to the above, the screw hole 5 and the outer keyway 4 may be provided in the cylinder tube 1, and the inner keyway 6 and the hole 7 may be provided in the cylinder cover 2.

Furthermore, in the case of a large-diameter cylinder, if the ring key 9 is divided into a plurality of arcuate pieces, it is easy to attach the ring key 9 to the cylinder.

As described above, in the method of the present invention, a male screw is inserted into a screw hole and a ring key is inserted into an outer key groove, and the open end of a cylinder tube and a cylinder cover are connected between the outer key groove and the inner key of both. Cylinder tube In addition to regulating the rotation of the cylinder cover relative to the cylinder tube, the ring key is also pushed apart by the male screw and fitted into both the inner and outer key grooves, thereby preventing the cylinder cover from being removed from the cylinder tube. The cylinder cover can be easily prevented from being removed from the tube and prevented from rotating by the same mechanism, and the cylinder tube and cylinder cover can be easily assembled and disassembled.

[Brief explanation of the drawing]

The drawings are for showing one embodiment of the present invention.
Figure 1 is a vertical cross-sectional view showing the cylinder cover before it is fitted into the cylinder tube, Figure 2 is a cross-sectional view of the cylinder cover after it has been fitted, and Figure 3 is a cross-sectional view of the cylinder cover that has been fitted and further prevents the cylinder cover from being removed or rotated. FIG. 4 is a longitudinal cross-sectional view of the assembled state, and FIG. 4 is a cross-sectional view of the same. 1... Cylinder tube, 2... Cylinder cover, 4... Outer keyway, 5... Threaded hole, 6... Inner keyway, 7... Hole, 8... Male thread, 8b... Male thread head, 9... Ring key, 9a... Notch part of the ring key.

Claims (1)

[Claims] 1. In a cylinder in which a cylinder cover is fitted inside or outside the open end of the cylinder tube, the one located inside the open end and the cylinder cover has an annular outer keyway 4 on its outer peripheral surface. At the same time, a screw hole 5 is provided at a predetermined position of this outer keyway 4, and an annular inner keyway 6 is provided on the inner peripheral surface of the outer keyway 4.
In addition, a hole 7 passing through the keyway 6 is provided at a predetermined position of the keyway 6, and the screw hole 5
and the notch 9a in the outer keyway 4.
The ring keys 9 each having a ring key 9 are recessed therein, and the open end and the cylinder cover are fitted together until the outer key groove 4 and the inner key groove 6 of both are aligned, and the male screw 8 is inserted into the screw hole 5. By screwing the male screw 8 outward to place the head 8b of the male screw 8 into the hole 7 through the notch 9a, rotation of the cylinder cover relative to the cylinder tube is restricted, and the screw of the male screw 8 is A cylinder cover fixing method characterized in that the cylinder cover is prevented from being removed from the cylinder tube by pushing and expanding the ring key and fitting it into both the outer key groove 4 and the inner key groove 6. .