JPS6026077Y2 - oil jack - Google Patents

Description

[Detailed description of the invention] This invention relates to an oil jack and a lifting device using an oil jack (hereinafter collectively referred to as an oil jack). joined to,
This invention relates to the structure of a casing whose upper end is joined to a cylinder.

To explain the structure of the oil tank in a conventional oil jack, as shown in FIG.
and the cylinder 1, as shown in FIG.
An oil tank portion was formed between the cylinder 1 and the cylinder 1.

If the bed is a cast iron bed 3', as shown in Fig. 3, the cylinder 1 is fixed to the bed 3' with screws 6, and a cylindrical casing 2' is placed outside the cylinder 1. A seal backing 7.8 is applied to the upper and lower ends respectively, and a cast iron head 10 is attached to the screw 9 at the top of the cylinder 1.
Screw in the casing 2 with the bed 3' and the head 10.
The seal backings 7 and 8 on the top and bottom of the casing were compressed by sandwiching the casing.

Or is the seal sealed with an O-ring backing as shown in Figure 4? ', 8' may also be used in the radial direction.

Since the conventional structure described above requires welding or thread cutting, processing and assembly are troublesome, labor-intensive and time-consuming, and therefore expensive.

This idea was made to eliminate the above drawbacks, and the purpose was to provide an oil jack that could be easily assembled. Elastic seals were used at the upper and lower ends of the casing, and a restraining plate was used to press them. It features a simple structure in which the cylinder is fixed to the cylinder using a snap ring at the upper end of the casing.

In the following, the invention will be explained with reference to the illustrated embodiments.

Also in this invention, as shown in FIGS. 5 and 6, the cylinder 11 and casing 12 are almost the same as the conventional cylinder 1 and casing 2 shown in FIG.

At the lower end 12a of the casing 12, a sealing body 14 made of an elastic material such as rubber, that is, an O-ring or a square ring, is interposed between the casing 12 and the bed 13, which may be made of steel or cast iron.

At the upper end 12b of the casing, a seal body 15 made of an elastic material such as a special rubber backing (Fig. 5) or an O-ring (Fig. 6) is interposed between the cylinder 11 and the casing together with the seal body at the upper end. 12 is pressed (downward), and the holding plate 16 is fixed to the cylinder 11 using a snap spring 17 while applying downward pressure.

Since the oil jack of this invention has its oil tank casing constructed and attached as described above, it is extremely simple and easy to manufacture and assemble, and can be manufactured at low cost.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view showing the structure of a conventional oil jack.
Figure 2 is an enlarged partial cross-sectional view showing the part inside the circle in Figure 1;
Fig. 3 is a partial sectional view showing a conventional structure in the case of a cast iron bed, Fig. 4 is a sectional view similar to Fig. 3 showing another embodiment, and Figs. 5 and 6 are oil jacks according to this invention. FIG. 3 is a partial cross-sectional view showing an example of the structure of mainly an oil tank portion. 1...Cylinder, 2,2'...Casing, 3.3'...Bed, 4,5...
・Welded part, 6, 9... Thickness, 7, 8...
・Seal backing, 10...Head, 11・
...Cylinder, 12 ...Casing, 1
2a, 12b... upper and lower ends, 13... bed, 14, 15... seal body, 16...
...Retainer plate, 17...Snap ring.

Claims (1)

[Scope of utility model registration request] A sealing body made of an elastic material is interposed at the lower end of the casing forming an oil tank on the outside of the cylinder, and at the joint with the bed and the upper end of the casing, respectively. An oil jack characterized by comprising a snap ring for fixing a pressing plate to a cylinder.