Pneumatic puller

Patent metadata

Field	Value
Publication number	US-2025033173-A1
Application number	US-202418783103-A
Country	US
Kind code	A1
Filing date	Jul 24, 2024
Priority date	Jul 26, 2023
Publication date	Jan 30, 2025
Grant date	—

Abstract

A pneumatic puller includes a shell unit, a pulling member that has a fixed section and an exposed section, a piston that is fixedly connected to the fixed section, a directional valve assembly that is movably mounted to the piston, and a cylinder that is sleeved on the fixed section. The cylinder and the piston define a first chamber and a second chamber. The cylinder is movable along the fixed section between a first reverse position and a second reverse position relative to the piston when urged by pressure of a gas. The cylinder abuts against one side of the piston and the directional valve assembly releases the gas into the second chamber when the cylinder is in the first reverse position. The cylinder moves along the fixed section away from the exposed section and hits the piston when moving from the first reverse position to the second reverse position.

First claim

What is claimed is:

1 . A pneumatic puller comprising:
a shell unit defining a sliding space; a pulling member fixedly connected to the shell unit, and having a fixed section that extends in the sliding space and an exposed section that is opposite to the fixed section; a valve unit including a piston that is fixedly connected to the fixed section, and a directional valve assembly that is movably mounted to the piston and that is adapted for controlling a gas flow direction; and a cylinder movably disposed in the sliding space, sleeved on the fixed section, and including a cylinder wall that surrounds the piston and that is in airtight contact with the piston, the cylinder and the piston defining a first chamber and a second chamber, the cylinder being movable along the fixed section between a first reverse position and a second reverse position relative to the piston when urged by pressure of a gas, the cylinder abutting against one side of the piston and the directional valve assembly releasing the gas into the second chamber when the cylinder is in the first reverse position, the cylinder abutting against another side of the piston and the directional valve assembly releasing the gas into the first chamber when the cylinder is in the second reverse position, the cylinder moving along the fixed section away from the exposed section and hitting the piston when moving from the first reverse position to the second reverse position.

2 . The pneumatic puller as claimed in claim 1 , wherein the shell unit includes a housing, and an end cap that is connected to the housing and that cooperates with the housing to define the sliding space, the housing surrounding an axis, and having an opening portion and a blind end portion that is opposite to the opening portion, the end cap being connected to the opening portion and being spaced apart from the blind end portion along the axis, the cylinder being adjacent to the blind end portion and being spaced apart from the end cap when the cylinder is in the first reverse position.

3 . The pneumatic puller as claimed in claim 2 , wherein, when the cylinder is in the second reverse position, the cylinder is adjacent to the end cap and is spaced apart from the blind end portion.

4 . The pneumatic puller as claimed in claim 2 , wherein the blind end portion of the shell unit has a plurality of gas discharge holes that are in spatial communication with the sliding space and an external environment, the end cap having a plurality of gas discharge holes that are in spatial communication with the sliding space and the external environment, the gas discharge holes of the blind end portion and the gas discharge holes of the end cap being adapted for guiding the gas that is in the sliding space to the external environment, the cylinder further including a first cylinder cover that is connected to the cylinder wall and the pulling member, and a second cylinder cover that is connected to the cylinder wall and that is spaced apart from the first cylinder cover along the axis, the first cylinder cover having a plurality of gas outlets that are in spatial communication with the first chamber and the sliding space, the second cylinder cover having a plurality of gas outlets that are in spatial communication with the second chamber and the sliding space, the gas outlets of the first cylinder cover and the gas outlets of the second cylinder cover being adapted for guiding the gas that is in the cylinder to the sliding space.

5 . The pneumatic puller as claimed in claim 4 , wherein the pulling member further has an intake passage that extends from the exposed section to the fixed section and that is adapted for being in spatial communication with a gas source, the piston defining a gas chamber that is in spatial communication with the intake passage, the directional valve assembly being adapted for allowing the gas that is contained in the gas chamber to flow into the cylinder.

6 . The pneumatic puller as claimed in claim 5 , wherein:
the piston includes a first end portion that faces the first cylinder cover, and a second end portion that is opposite to the first end portion and that faces the second cylinder cover, the first end portion having a plurality of first valve holes that are in spatial communication with the gas chamber and the first chamber, the second end portion having a plurality of second valve holes that are in spatial communication with the gas chamber and the second chamber, the directional valve assembly including a plurality of directional valve rods each of which movably extends into a respective one of the first valve holes and a respective one of the second valve holes, and a plurality of airtight members that are sleeved on the directional valve rods; when the cylinder is in the first reverse position, the first cylinder cover is adjacent to the blind end portion of the housing, the second cylinder cover is in contact with the second end portion of the piston, and the airtight members block the spatial communication between the gas chamber and each of the first valve holes; and when the cylinder is in the second reverse position, the first cylinder cover is in contact with the piston, the second cylinder cover is adjacent to the end cap, and the airtight members block the spatial communication between the gas chamber and each of the second valve holes.

7 . The pneumatic puller as claimed in claim 6 , wherein:
a length of each of the directional valve rods in an extending direction of the axis is greater than a length of the piston in the extending direction of the axis, the directional valve rods respectively extending out of the first valve holes when the cylinder is in the first reverse position, the directional valve rods respectively extending out of the second valve holes when the cylinder is in the second reverse position; when the cylinder is moved from the first reverse position to the second reverse position, the directional valve rods that respectively extend out of the first valve holes are pushed by the first cylinder cover to move relative to the piston such that the directional valve rods respectively extend out of the second valve holes; and when the cylinder is moved from the second reverse position to the first reverse position, the directional valve rods that respectively extend out of the second valve holes are pushed by the second cylinder cover to move relative to the piston such that the directional valve rods respectively extend out of the first valve holes.

8 . The pneumatic puller as claimed in claim 5 , further comprising a control unit that includes a valve seat that is connected to the exposed section, an intake valve assembly that is mounted to the valve seat, and a trigger subunit that is mounted to the valve seat and that is operable, the valve seat having a channel that is in spatial communication with the intake passage and the gas source, and that is adapted for guiding the gas into the intake passage, the intake valve assembly openably closing the channel, the trigger subunit being operable to urge the intake valve assembly to open the channel.

9 . The pneumatic puller as claimed in claim 8 , wherein the intake valve assembly includes a gas valve that abuts against the valve seat to close the channel, and a first resilient member that abuts against the valve seat and the gas valve, the gas valve cooperating with the valve seat to define an opening that is in spatial communication with the channel when the intake valve assembly opens the channel, the first resilient member resiliently biasing the gas valve toward the valve seat, the trigger subunit including a switch valve rod that extends through the valve seat and that is movable relative to the gas valv

Assignees

• Basso Ind Corp

Inventors

• Lai Chun-Chi
• Wang Chia-Wen

Classifications

• B25B27/026 Primary

  fluid driven · CPC title

• B25D2250/171

  Percussive pulling action of tools for extraction of elements · CPC title

• B25D9/08

  comprising a built-in air compressor {, i.e. the tool being driven by air pressure} · CPC title

• B25D9/18

  involving a piston-type slide valve · CPC title

• B25B27/04

  inserting or withdrawing keys · CPC title