US 4,226,133 AGranted

Adjustable pulley construction

OwnerMerlin S. Hankeinventor

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Abstract

A first pulley disc having an inner tubular-shaped member extending concentrically at right angles from the center of said first disc. The inner hub is formed with an externally threaded annular portion adjacent the disc and a smooth surfaces, cylindrical outer end portion. A pair of diametrically opposed slots is formed in the outer end portion and extend in an axial longitudinal direction toward the threaded portion. A second pulley disc having an outer cylindrical-shaped hub member extending concentrically at right angles from the center of said second disc. The outer hub member has an internally threaded end portion adjacent the second disc and an annular internally recessed outer end portion. A threaded opening extends radially through the outer hub member and into the internal recessed portion. The internally threaded portion of the outer hub is engaged with the externally threaded portion of the inner hub for selectively spacing complementary marginal belt engaging surfaces of the disc. A setscrew is adjustably mounted in the radial opening of the outer hub and extends through the inner hub slots to prevent relative rotation between the inner and outer hubs and discs in order to maintain the discs in their adjusted position while simultaneously clampingly engaging a shaft extending through the inner hub to mount the adjusted pulley on the shaft. The smooth cylindrical outer end portion of the inner hub is telescopically received within an inwardly extending annular outer end flange formed on the outer hub to form a general slip fit engagement therebetween to prevent wobble between the threadedly engaged hubs.

Variable pitch pulley construction including:

(a) first and second disc means having spaced, outwardly extending complementary belt-engaging surfaces;
(b) inner hub means mounted on and extending concentrically from the first disc means, said first disc means and inner hub means being formed with a shaft-receiving bore;
(c) the inner hub means having an externally threaded portion located adjacent the first disc means and an unthreaded outer end portion;
(d) longitudinally extending slot means formed in the unthreaded outer end portion of the inner hub means and communicating with the bore of said inner hub means;
(e) outer hub means mounted on an extending concentrically from the second disc means, said second disc means and outer hub means being formed with a bore axially aligned with the bore of the first disc means and inner hub means;
(f) the outer hub means bore having an internally threaded portion and an internally unthreaded portion;
(g) a radially extending threaded opening formed in the outer hub means and communicating with the unthreaded portion of the outer hub means bore;
(h) single set screw means adjustably mounted in the radially extending threaded opening of the outer hub means;
(i) the internally threaded portion of the outer hub means bore being engaged with the externally threaded portion of the inner hub means to adjustably mount the second disc means on the inner hub means of the first disc means for selectively spacing the belt engaging surfaces of the first and second disc means with respect to each other, said radially extending threaded opening of the outer hub means being adapted to be in radial alignment with the slot means of the inner hub means when the disc means are in an adjusted position;
(j) the set screw means extending through the aligned radial opening and slot means of the outer and inner hub means and into the bore of the inner hub means for engaging a shaft extending through said inner hub means bore to mount the pulley construction on said shaft while simultaneously operatively engaging the inner hub means to prevent relative rotation between the adjusted inner and outer hub means;
and
(k) the unthreaded outer end of the inner hub means forming a slip fit telescopic engagement with the unthreaded portion of the outer hub means bore.

9 more elements

Abstract

Claims6