Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1983-12-28
1985-04-30
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
B25B 1348
Patent
active
045136440
ABSTRACT:
A fluid-powered torque wrench connectible to external fluid lines including an elongated cylindrical body having ports for introducing pressurized fluid therein; an output shaft rotatably disposed within the body and having a drive end for securing a socket thereto for engaging and driving a nut by rotation of the shaft; linear-to-rotary transmission means disposed within the body and operable to provide relative rotational movement between the shaft and the body, the transmission means including a piston for application of fluid pressure to one or another side thereof to produce linear movement of the piston within the body, and means for translating linear movement of the piston into relative rotational movement between the shaft and the body; an elongated lever arm having a head end portion for rotatably supporting and selectively engaging the body, and a handle end portion for holding the lever arm stationary; a ratchet operative between the lever arm and the body for preventing rotational movement of said body relative to the lever arm in a first rotational direction and permitting rotational movement of the body relative to the lever arm in the second rotational direction; and a stem axially aligned with the body and projecting from the exterior of the body through an end cap thereof and through the piston, the stem being rotatably received by the end cap and the piston, and slidably engaging the piston, the stem extending sufficiently into the body to engage the piston during the entire travel of the piston within the body, and having a pair of interiorly disposed conduits, the one conduit communicating fluid between one of the external fluid lines and one side of the piston, and the other conduit communicating fluid between another of the external fluid lines and the other side of the piston, the stem being in fluid-sealed relation with the end cap and the piston.
REFERENCES:
patent: 2702489 (1955-02-01), Wallace
patent: 2740508 (1956-04-01), Shaff
patent: 2808749 (1957-10-01), Lampke
patent: 2895359 (1959-07-01), Nelson
patent: 2952176 (1960-09-01), Mitchel
patent: 3602072 (1971-08-01), Sensat
patent: 3733935 (1973-05-01), Tsuji
patent: 3866493 (1975-02-01), Ringerud
patent: 3939924 (1976-02-01), Grabovac
patent: 4116093 (1978-09-01), DePagter
patent: 4141261 (1979-02-01), Tummel
patent: 4346630 (1982-08-01), Hanson
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