Pneumatic ratchet wrench and outer shell thereof

Patent metadata

Field	Value
Publication number	US-11260506-B2
Application number	US-201916260369-A
Country	US
Kind code	B2
Filing date	Jan 29, 2019
Priority date	Feb 6, 2018
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A pneumatic ratchet wrench includes a main body formed with a receiving chamber, a head unit, a driving unit and an air motor. The head unit defines a gas passage, and includes a ring portion and a frame portion. The ring portion includes an exit in spatial communication with the gas passage and opens toward the frame portion. The driving unit includes a driving head, and a transmission shaft mounted in the head unit. The air motor drives the transmission shaft and includes a cylinder and a rotor. The cylinder includes a venting hole allowing gas produced in the cylinder to pass through the venting hole and the gas passage and to exit from the exit to be blown toward the frame portion.

First claim

What is claimed is:

1. A pneumatic ratchet wrench comprising:
a main body including a receiving chamber that extends along a central axis;
a head unit defining at least one gas passage, said head unit including a ring portion detachably connected to said main body, and a frame portion extending from said ring portion of said head unit in a direction parallel to the central axis and away from said main body, said ring portion of said head unit including at least one exit that is in spatial communication with said gas passage, that is adjacent to said frame portion, and that opens toward said frame portion;
a driving unit including a driving head that is rotatably mounted to said frame portion and that is rotatable about a rotating axis perpendicular to the central axis, and a transmission shaft that is mounted in said head unit, that extends along a direction parallel to the central axis, and that transmits a driving force to said driving head; and
an air motor disposed in said receiving chamber of said main body, pneumatically driving said transmission shaft and including a cylinder and a rotor, said cylinder including a venting hole that allows gas produced in said cylinder to pass through said venting hole and said gas passage and to exit from said exit to be blown toward said frame portion;
wherein said head unit further defines a transmission room that extends along the central axis, that receives said transmission shaft, and that constitutes said gas passage;
wherein said transmission room is in spatial communication with said receiving chamber such that the gas produced in said cylinder passes through said venting hole, said receiving chamber and said transmission room; and
wherein said head unit further includes a pressing ring portion that is opposite to said ring portion of said head unit, that is connected to said main body, and that includes at least one entrance in spatial communication with and disposed between said receiving chamber and said transmission room.

2. The pneumatic ratchet wrench as claimed in claim 1 , wherein said main body further includes an inner surface that surrounds the central axis and that defines said receiving chamber, and at least one passage that is formed in said inner surface, that extends along the central axis and that is in spatial communication with and disposed between said receiving chamber and said entrance.

3. The pneumatic ratchet wrench as claimed in claim 1 , wherein said frame portion is bifurcated and includes two frames that define a space therebetween, said entrance and said exit allowing the gas to flow along the central axis, said exit opening toward and being adjacent to the space between said frames.

4. The pneumatic ratchet wrench as claimed in claim 1 , wherein said ring portion of said head unit further includes a stepped portion, said entrance and said exit allowing the gas to flow along the central axis, said exit being formed in said stepped portion.

5. The pneumatic ratchet wrench as claimed in claim 1 , wherein said pressing ring portion includes a plurality of said entrances that surround the central axis, said ring portion of said head unit including a plurality of said exits that are respectively in spatial communication with said entrances.

6. The pneumatic ratchet wrench as claimed in claim 1 , wherein said head unit further includes a pressing ring and a head, said pressing ring including said pressing ring portion that abuts against said cylinder, and a connection portion that is opposite to said pressing ring portion, said head including said ring portion that is connected to said connection portion, and said frame portion that is connected to said ring portion of said head unit.

7. The pneumatic ratchet wrench as claimed in claim 6 , wherein said head unit further includes a packing ring, said pressing ring further including an external thread that is formed in an outer surface of said pressing ring portion and an outer surface of said connection portion, said head further including an external thread that is formed in an outer surface of said ring portion of said head unit, said packing ring including two internal threads that are respectively and threadedly engaged with said external thread of said pressing ring and said external thread of said head.

8. The pneumatic ratchet wrench as claimed in claim 6 , further comprising a collar, said main body including a plurality of vent holes that extend along a direction parallel to the rotating axis and that are in spatial communication with said receiving chamber, said entrance of said pressing ring portion allowing the gas to pass therethrough along the direction parallel to the central axis, said collar surrounding said main body and a portion of said pressing ring portion, said collar cooperating with said main body and said connection portion of said pressing ring to define a venting space that is in spatial communication with and disposed between said vent holes and said entrance.

9. The pneumatic ratchet wrench as claimed in claim 1 , further comprising a striking unit that is disposed in said transmission room of said head unit, and that includes a striking seat drivable by said rotor, at least one striking block extending through said striking seat and connected to an end of said transmission shaft, and two pins disposed between said striking seat and said striking block and operable to strike said transmission shaft.

10. The pneumatic ratchet wrench as claimed in claim 9 , wherein said striking unit further includes an annular seat and an annular cover that is connected to said annular seat and cooperates with said annular seat to define a retaining space receiving said striking seat, said annular seat cooperating with said annular cover and said head unit to define an annular passage that surrounds the central axis and that is in spatial communication with and disposed between said entrance and said exit.

11. An outer shell of a pneumatic ratchet wrench, the pneumatic ratchet wrench including a driving unit and an air motor, the driving unit including a driving head and a transmission shaft that transmits a driving force to the driving head, the air motor including a cylinder and a rotor that is pneumatically driven by the cylinder to drive the transmission shaft, the cylinder including at least one venting hole, said outer shell comprising:
a main body including a receiving chamber that extends along a central axis, that is adapted for receiving the air motor, and that is adapted for receiving gas produced in the cylinder; and
a head unit detachably connected to said main body, adapted for the transmission shaft to be mounted therein, and defining at least one gas passage, said head unit including a ring portion that is detachably connected to said main body, and a frame portion that extends from said ring portion of said head unit in a direction parallel to the central axis and away from said main body and that is adapted for the driving head to be rotatably mounted thereto, the driving head being rotatable about a rotating axis perpendicular to the central axis, said ring portion of said head unit including at least one exit that is in spatial communication with said gas passage, that is adjacent to said frame portion, and that opens toward said frame portion, said gas passage guiding the gas produced in the cylinder to be discharged from said venting hole to exit from said exit and to be blown toward said frame portion;
wherein said head unit further defines a transmission room that extends along the central axis, that is adapted for receiving the transmission shaft, and that constitutes said gas passage;
wherein said transmission room is in spatial communication with sai

Assignees

• Basso Ind Corp

Inventors

• Su San-Yih
• Lai Cheng-Wei

Classifications

• B25B21/005 Primary

  driven by a radially acting hydraulic or pneumatic piston · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title

• B25B13/465 Primary

  a pawl engaging an internally toothed ring · CPC title