| 摘要 |
A thin jack includes a body, a piston support post, and a dividing piston. The body has a receiving chamber which opens down, a limiting piston circumferentially disposed on the receiving chamber, and upper and lower passages penetrating the body and being in communication with the receiving chamber. The piston support post is movably received in the receiving chamber and is in fluidtight sliding contact with the limiting piston. The dividing piston is disposed at the piston support post, is in fluidtight sliding contact with the receiving chamber, corresponds in position to the limiting piston to confine the dividing piston to the receiving chamber, and divides the receiving chamber into upper and lower receiving spaces in communication with the upper and lower passages, respectively. Accordingly, elevation of the body is controllable while lifting an object, and users can keep raising the thin jack without moving the thin jack horizontally. |
| 主权项 |
1. A thin jack, comprising:
a body having:
a receiving chamber concavely disposed in the body and having an opening opening down;a limiting piston circumferentially disposed on a sidewall of the receiving chamber and positioned proximate to the opening;an upper passage penetrating a sidewall of the body and being in communication with a top portion of the receiving chamber; anda lower passage penetrating the sidewall of the body and being in communication with a bottom portion of the receiving chamber; a piston support post movably received in the receiving chamber and having a sidewall in fluidtight sliding contact with the limiting piston; a dividing piston disposed at a top portion of the piston support post, being in fluidtight sliding contact with a sidewall of the receiving chamber, and corresponding in position to the limiting piston to confine the dividing piston to the receiving chamber; and a supporting annular unit with an internal thread structure disposed on an inner wall of the supporting annular unit, and the body further has an external thread structure disposed on an outer surface of a sidewall of the body, the external thread structure corresponding in position to the internal thread structure, such that the body can be fixed in place by the supporting annular unit, wherein the dividing piston divides the receiving chamber into an upper receiving space and a lower receiving space, the upper receiving space being in communication with the upper passage, and the lower receiving space being in communication with the lower passage; wherein an outward opening of the upper passage of the body is positioned above the external thread structure, and an outward opening of the lower passage of the body is positioned above the external thread structure. |
