H-Key adjustable pulley

Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Plural members forming plural belt-receiving grooves on...

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403358, 411217, 411255, 411315, 474 39, 474 42, F16H 918

Patent

active

045042497

ABSTRACT:
An adjustable pulley construction including a first disc having a belt-engaging surface and a centrally located, internally threaded annular hub, the hub having an exterior flat face and an interior recess; and a second disc having a belt-engaging surface and a centrally located annular externally threaded axle, the annular hub of the first disc being coaxially with and movable relative to the axle. The belt-engaging surfaces are positioned in facing relationship to receive a pulley belt therebetween. Securing elements for maintaining a desired space relation between the discs, the securing elements include: a threaded bore disposed in the hub transverse to the axle, a set screw received in the bore, a longitudinal keyway in the hub communicating with the bore, a keyway land provided on the axle in line with the set screw, and a generally H-shaped key. The key is positioned within the recess in the hub and engaged by the set screw to provide a frictional clamping action of the key onto the keyway land. One arm of the key projects beyond the exterior flat surface of the hub and the second arm projects inwardly into an interior recess, the length of the second arm being greater than the width of the keyway recess, thus retaining the key within the recess upon removal of the screw.

REFERENCES:
patent: 827023 (1906-07-01), Knoener
patent: 2519723 (1950-08-01), Wearn
patent: 2577516 (1951-12-01), Firth
patent: 2633031 (1953-03-01), Browning
patent: 2641981 (1953-06-01), Pilsner
patent: 2855787 (1958-10-01), Kumro et al.
patent: 3250553 (1966-05-01), Detwiler
patent: 3661023 (1972-05-01), Maurey
patent: 3680404 (1972-08-01), Firth
patent: 3815432 (1974-06-01), Maurey et al.
patent: 3863514 (1975-02-01), Jensen
"Product Engineering", vol. 3, Sep. 1932, p. 385, Variable Pitch Diameter Texsteel Sheave.

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