TWM446250U - Piston apparatus of air cylinder - Google Patents

Description

Pneumatic rod piston device

The present invention relates to a piston device, and more particularly to a piston device that can be mounted in a cylinder of a gas pressure bar.

The gas pressure rod generally installed at the bottom of the chair has a structure mainly comprising a cylinder body and a piston device capable of moving up and down in the cylinder body to adjust the height of the seat cushion.

Referring to Figures 1 and 2, a piston device 1 disclosed in the new patent number M227135, which is mounted up and down in a hollow cylinder 21 of a gas pressure bar 2, the piston device 1 comprising: a kit portion a piston rod 11 of 111, a set of lower spacers 12 disposed on the kit portion 111, a set of upper spacers 13 disposed on the kit portion 111 and spaced above the lower spacer 12, and a set A convex ring 14 , an O-ring 15 , and an oil stop ring 16 on the kit portion 111 between the lower spacer 12 and the upper spacer 13 . The male ring 14 has a ring groove 141 recessed in the inner edge of the bottom ring surface, and a collar groove 142 recessed in the outer edge of the top ring surface. The collar groove 142 is spaced apart from the ring groove 141. The ring groove 141 is inserted into the O-ring 15 for locking the oil stop ring 16.

When the piston device 1 is assembled, the assembler first inserts the lower gasket 12 into the sleeve portion 111 of the piston rod 11, and then inserts the O-ring 15 into the annular groove 141 of the male ring 14. And attaching the male ring 14 together with the O-ring 15 to the sleeve portion 111 and pressing on the lower spacer 12; continuing the previous step, the oil retaining ring 16 is plugged into the collar groove 142. Finally will be on the pad After the sheet 13 is inserted into the kit portion 111 and pressed against the male ring 14 and the oil retaining ring 16, the piston device 1 is assembled.

The conventional piston device 1 is designed to be inserted into the O-ring 15 and the oil retaining ring 16 through the annular groove 141 and the collar groove 142 of the male ring 14, although the cylinder of the gas bar 2 can already be used. 21 forms an airtight. However, in actual assembly, since the collar groove 142 and the ring groove 141 are spaced apart from each other, in addition to the need to fix the O-ring 15 with the lower gasket 12, it is necessary to use the upper gasket 13 to abut The top surface of the male ring 14 can fix and limit the oil retaining ring 16 , which leads to a step of assembling the conventional piston device 1 , and more than one upper gasket 13 is equivalent to increasing the cost, so it is convenient to consider assembly. The savings in terms of sex and cost, the design of the new patent has yet to be improved.

Accordingly, it is an object of the present invention to provide a piston assembly that is easy to assemble and that is cost effective.

Thus, the novel piston device can be mounted in a cylinder of a gas pressure bar and comprises: a piston rod, a piston, a ring unit, and a gasket.

The piston rod includes an assembly portion that is movable up and down in the cylinder, and a stem portion that extends downward from the bottom end of the assembly portion and that passes through the bottom end of the cylinder. The piston is assembled at the assembly portion of the piston rod and includes a piston ring body having a bottom annulus and an outer annular groove recessed on an outer edge of the bottom annulus. The ring unit includes an outer airtight ring that is plugged onto the outer ring groove of the piston. The gasket is assembled at the assembly portion of the piston rod and below the piston ring body of the piston and abuts against the bottom edge of the ring unit.

The utility model has the advantages that the outer ring groove of the piston is plugged by the outer airtight ring of the ring unit, and the outer ring groove is designed to be recessed on the outer edge of the bottom ring surface, so the novel manufacturing method It is possible to have one less spacer against the top surface of the piston, and only one piece of the gasket that abuts against the bottom edge of the ring unit, in addition to facilitating assembly, can also save costs.

The foregoing and other technical aspects, features and advantages of the present invention will be apparent from the following description of the preferred embodiments.

Referring to Figures 3 and 4, a preferred embodiment of the present piston assembly is adapted for mounting in a hollow cylinder 31 of a gas pressure bar 3. The piston device comprises a piston rod 4, a piston 5, a ring unit 6, and a gasket 7.

The piston rod 4 is made of metal and includes an assembly portion 41 that is movable up and down in the cylinder block 31, and a bottom portion extending downward from the bottom end of the assembly portion 41 and passing through the bottom of the cylinder block 31. End rod 42.

The piston 5 is made of metal and assembled to the assembly portion 41 of the piston rod 4. The piston 5 includes a piston ring body 51 having a hollow ring shape. The piston ring body 51 has a bottom ring surface 511, an outer ring groove 512 recessed in an outer edge of the bottom ring surface 511, and a recessed An inner ring groove 513 of the inner edge of the bottom ring surface 511.

The ring unit 6 is made of rubber or silicone, and includes an outer airtight ring 61 that is received in the outer ring groove 512 of the piston 5, and an inner airtight plug that is received in the inner ring groove 513. Loop 62. The outer airtight ring 61 is adjacent to the gas The cylinder 31 of the rod 3 is pressed, and the inner airtight ring 62 is adjacent to the outer peripheral surface of the assembly portion 41 of the piston rod 4.

The spacer 7 is made of metal and has a hollow ring shape. The spacer 7 is assembled to the assembly portion 41 of the piston rod 4 and is positioned below the piston ring body 51 of the piston 5. The top surface of the spacer 7 abuts against the bottom edge of the ring unit 6, so that the ring unit 6 can be fixed to the bottom of the piston ring body 51.

When assembling the preferred embodiment, the assembler first inserts the spacer 7 into the assembly portion 41 of the piston rod 4, and respectively sets the outer airtight ring 61 and the inner airtight ring 62 of the ring unit 6 respectively. Plugged into the outer ring groove 512 and the inner ring groove 513 of the piston 5, and then simultaneously insert the piston 5 and the ring unit 6 into the assembly portion 41, and the outer airtight ring 61 and the inner air The bottom edge of the ring ring 62 abuts against the top surface of the gasket 7, respectively, at which point the piston assembly is assembled.

In summary, the design of the bottom of the piston 5 by the ring unit 6 is such that only one spacer 7 is needed to fix the ring unit 6 to achieve airtightness, in addition to being able to increase In addition to the convenience of assembly, it also reduces costs.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent.

3‧‧‧ gas pressure bar

31‧‧‧Cylinder

4‧‧‧ piston rod

41‧‧‧ Assembly Department

42‧‧‧ pole

5‧‧‧Piston

51‧‧‧ piston ring body

511‧‧‧ bottom annulus

512‧‧‧ outer ring groove

513‧‧‧ Inner ring groove

6‧‧‧ring unit

61‧‧‧Outer airtight ring

62‧‧‧Inside airtight ring

7‧‧‧shims

Figure 1 is a sectional view showing a combination of a new patent number of the certificate number M227135 and a cylinder of a gas pressure bar; Figure 2 is an exploded perspective view of the preferred embodiment of the present invention; Figure 3 is a perspective view of a preferred embodiment of the piston assembly of the present invention and a cylinder of a gas pressure bar; and Figure 4 is an exploded perspective view of the preferred embodiment.

3‧‧‧ gas pressure bar

31‧‧‧Cylinder

4‧‧‧ piston rod

41‧‧‧ Assembly Department

42‧‧‧ pole

5‧‧‧Piston

51‧‧‧ piston ring body

511‧‧‧ bottom annulus

512‧‧‧ outer ring groove

513‧‧‧ Inner ring groove

6‧‧‧ring unit

61‧‧‧Outer airtight ring

62‧‧‧Inside airtight ring

7‧‧‧shims

Claims (2)

A piston device for a gas pressure rod, mounted in a cylinder of a gas pressure rod, and comprising: a piston rod comprising an assembly portion movable in the cylinder body up and down, and extending downward from a bottom end of the assembly portion And a rod portion passing through the bottom end of the cylinder; a piston assembled in the assembly portion of the piston rod and including a piston ring body having a bottom ring surface and a recessed surface An outer ring groove of the outer edge; a ring unit including an outer airtight ring plugged on the outer ring groove of the piston; and a gasket assembled at the assembly portion of the piston rod and positioned at the piston Below the piston ring body, and against the bottom edge of the ring unit. The piston device of the gas pressure rod according to claim 1, wherein the piston ring body of the piston further has an inner ring groove recessed at an inner edge of the bottom ring surface, the ring unit further comprising a plug An inner airtight ring fitted in the inner ring groove.