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US 4,300,641 AGranted
Torque responsive, dual speed rotary power driver
AssigneeDemag Aktiengesellschaft
InventorKarl Kinkel
Life of this patent
Estimating the term…
Abstract
A rotary power driver is provided which drives with a two-stage torque and speed control, wherein the initial driving is done at higher speed and lower torque, and a subsequent higher torque is automatically imposed with lower speed. The second stage is a selected pre-set stage, with provision for the selected torque built into the driver. The second stage is imposed on the drive shaft by a one-way clutch or ratchet drive.
Claims5
A pressure fluid driven rotary tool apparatus, having a predetermined tightening torque and tightening limit, comprising:
- (a) a source of pressure fluid;
- (b) a tool casing;
- (c) a drive shaft in said casing;
- (d) a drive motor connected to one end of said drive shaft for rotating said drive shaft at high speed at predetermined low tightening torque;
- (e) pressure fluid flow communication means between said source and said motor;
- (f) a driving tool fixed to said drive shaft at the end thereof opposite said motor;
- (g) a piston in said casing coaxial with said drive shaft, said piston being axially displaceable in said casing;
- said apparatus characterized by
- (h) a drive element in said casing, said drive element coaxially positioned between said drive shaft and said piston;
- (i) means for connecting said drive shaft and said drive element in one direction of rotation upon said drive shaft reaching said predetermined tightening torque for rotating said drive shaft and driving tool at low speed at predetermined high tightening torque;
- (j) said connecting means including
- (i) a one-way clutch type mechanism and
- (ii) means for converting the axial displacement movement of said piston into rotary movement for said drive element;
- and
- (k) adjustable first valve means which effects said connecting means when the pressure of said pressure fluid obtains a preselected pressure.
12 more elements
Dependencies are inferred from the claim text.