Preliminary thrusting mechanism for a screw device

Details Preliminary thrusting mechanism for a screw device Preliminary thrusting mechanism for a screw device

1994-02-08

1996-12-10

Marmor, Charles A.

Machine element or mechanism

Gearing

Rotary bodies

74459, F16H 2522

Patent

active

055820727

ABSTRACT:
A preliminary thrusting mechanism for a screw device serves to achieve not only constant position type preliminary thrusting but also constant pressure type preliminary thrusting. The preliminary thrusting mechanism includes as essential components a screw shaft having a spirally extending screw groove formed axially along the outer surface thereof, a first nut threadably engaged with the screw shaft, a second nut operatively connected to the first nut in series and threadably engaged with the screw shaft, a rotation stopping unit for preventing the second nut from being rotated relative to the first nut, a thrusting unit including a thrusting member adapted to impart to the first nut and the second nut a certain intensity of thrusting power effective in the opposite direction for allowing them to be displaced away from each other in the axial direction, and a stopping unit for preventing the thrusting member from being displaced further when the thrusting member is displaced by a predetermined distance. In practice, the thrusting unit includes a liquid pressure source, a liquid pressure supplying path and a pressure chamber, and the stopping unit includes flanges each serving to prevent further displacement of the thrusting member.

REFERENCES:
patent: 3124969 (1964-03-01), Grabowski et al.
patent: 4487087 (1984-12-01), Johnstone
Bogelsack, G., "Kugelruckfuhrung and Gewindezentrierung in Kugelschraubgelenken", In: DE-Z. Feinwerktechnik, 71th year, 1967, vol. 7, pp. 335-339.

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