Torque control installation and removal tool

Details Torque control installation and removal tool Torque control installation and removal tool

1978-10-19

1981-04-21

Lazarus, Ira S.

81474, F16D 706

Patent

active

042625017

ABSTRACT:
A torque control tool for installing and removing threaded fasteners couples a driven section of the tool with a drive section of the tool through detent balls of the former and a clutch plate of the latter. The clutch plate keys to a stem of the drive section for rotation together and has semi-spherical sockets of substantially the same radius of curvature as the balls receiving the balls and lying on a circle about a rotational axis of the driven section. A carrier plate cages the balls so that they index with the clutch plate sockets and keys to the balance of the driven section to transmit torque to it. Reliefs to the side of each socket and centered on the circle of the sockets permit the detent balls to uncouple from the drive section at an applied installation torque less than the uncoupling torque in the opposite, removal direction. The depth of the reliefs leaves substantial spherically curved walls of the sockets opposing uncoupling torques in the installation direction and, accordingly, the balls can only come out of the sockets abruptly with no preliminary rotational movement between the balls and the socket about the rotational axis of the driven section. An axial compressive force acting between an adjustment cap and Belleville springs on the balls and clutch plate determines the torque at which the driven section uncouples from the drive section. A pressure plate interposes between the balls and the Bellevilles. A stem of the drive section couples to the clutch plate through a keyway that permits relative movement of the clutch plate along the axis of the stem. A thrust bearing between the adjustment cap and the clutch plate minimizes rotational drag. The carrier plate and pressure plate key to a housing of the driven section for relative axial movement with respect thereto but for rotation together.

REFERENCES:
patent: 2802354 (1957-08-01), Bohnhoff et al.
patent: 3243024 (1966-03-01), Schwab
patent: 3662628 (1972-05-01), Schnepel
patent: 3667250 (1972-06-01), Schnepel
patent: 3702546 (1972-11-01), Schnepel
patent: 3727432 (1973-04-01), Eaves et al.
patent: 3942337 (1976-03-01), Leonard et al.
patent: 4041729 (1977-08-01), Bilz

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