Air motor having angular displacement control means

Claim 2

A power tool, comprising: an air motor having a housing, said housing having a power chamber including a cylindrical wall formed about a first axis, rotor means mounted in the housing so as to be rotatable about a second axis spaced from and parallel to said first axis, a tool member connected to the rotor so as to be rotated therewith, a plurality of vanes, said vanes being mounted on the rotor means in regularly spaced angular intervals and engaging the cylindrical wall of the power chamber as said rotor is being rotated, a source of fluid under pressure and means for connecting said source to the power chamber for rotating said rotor means and said vanes as pressurized fluid is being passed through the chamber, sensing means mounted on the housing adjacent the path of motion of the vanes, counter means connected to the sensing means so as to be actuated as a vane passes said sensing means, and valve means connected between the source of fluid and the power chamber for blocking fluid flow to said power chamber and means connecting the counter means to the valve means for actuating same to block fluid flow to the power chamber when the counter means registers a predetermined value, whereby the tool member is rotated through only a predetermined angle of rotation.

Claim 3

A power tool as defined in claim 1, including means for rendering the counter means inoperative as the rotor is being rotated.

Claim 4

A power tool as defined in claim 1, in which the tool member is operative to impart a tightening motion to a fastener as the tool member is being rotated.

Claim 5

A power tool as defined in claim 1, in which the tool member is operative to impart a tightening motion to a fastener as the tool member is being rotated, and including first means responsive to a predetermined tightened condition of the fastener, and second means connecting the counter means to said first means for actuating the counter means at a predetermined tightened condition of the fastener.

Claim 6

A power tool, comprising: an air motor having a housing, said housing having a power chamber including a cylindrical wall formed about a first axis, a rotor mounted in the housing so as to be rotatable about a second axis spaced from the parallel to said first axis, a tool member operative to engage a fastener for a tightening motion, said tool member being connected to the rotor to be rotated therewith, a plurality of vanes, a source of fluid under pressure and means for connecting said source to the power chamber for rotating said rotor and said vanes as pressurized fluid is being passed through the chamber, said rotor having a plurality of slots disposed in regularly spaced angular intervals about said second axis, slot being suited for receiving a vane such that the vane is moved in a radial direction as the rotor is being rotated, electro-magnetic means mounted on the housing adjacent the path of motion of the rotor slots, counter means connected to the electro-magnetic means so as to be actuated in response to the motion of a rotor slot adjacent said electro-magnetic means, valve means connected between the source of fluid and the power chamber for blocking fluid flow to said power chamber, and means connecting the counter means to the valve means for actuating same to block fluid flow to the power chamber when the counter means registers a predetermined value, whereby the tool member is rotated through only a predetermined angle of rotation in accordance with the predetermined value of the counter means.

Claim 7

A power tool, comprising: an air motor having a housing, said housing having a power chamber including a cylindrical wall formed about a first axis, a rotor mounted in the housing so as to be rotatable about a second axis spaced from the parallel to said first axis, a tool member operative to engage a fastener for a tightening motion, said tool member being connected to the rotor to be rotated therewith, a plurality of vanes, a source of fluid under pressure and means for connecting said source to the power chamber for rotating said rotor and said vanes as pressurized fluid is being passed through the chamber, said rotor having a plurality of slots disposed in regularly spaced angular intervals about said second axis, slot being suited for receiving a vane such that the vane is moved in a radial direction as the rotor is being rotated, electro-magnetic means mounted on the housing adjacent the path of motion of the rotor slots, counter means connected to the electro-magnetic means so as to be actuated in response to the motion of a rotor slot adjacent said electro-magnetic means, valve means connected between the source of fluid and the power chamber for blocking fluid flow to said power chamber, and means connecting the counter means to the valve means for actuating same to block fluid flow to the power chamber when the counter means registers a predetermined value, whereby the tool member is rotated through only a predetermined angle of rotation in accordance with the predetermined value of the counter means.