GB528236A - Improvements in or relating to spring forks for cycles and motor cycles - Google Patents

Abstract

528,236. Spring forks. NORTON MOTORS, Ltd., and SMITH, C. G. May 8, 1939, No. 13638. [Class 136 (iii)] A spring fork of the tele scopic type for motor and other cycles comprises on each side a rigid tube secured a its upper part to the steering stem, a moving tube of large diameter adapted to slide ove the lower part of the fixed tube and to receive the whee spindle, a compression spring fitting over the fixed tube anc abutting between a shoulder thereon and the upper end of a bush or sleeve which is de tachably secured in the uppe end of the moving tube and i a sliding fit on the fixed tube and a further compression spring fitting over the lower part of the fixed tube and abutting between the lower end of the bush or sleeve and a collar secured on the lower end of the fixed tube. Eacl side of the fork comprises a fixed tube 10 rigidly mounted at its upper end in two vertically-spaced members 11 12 projecting laterally fron the steering-head, the member 12 terminating in a flanged lug 13 which is clamped between a shoulder 14 and a nut 15 screwed on to the tube 10, while the member 11 terminates in a split lug 16 to receive the upper end of the tube 10. A lower tube 20, provided with a fitting 30 to receive the wheel spindle, slides over the tube 10 under the control of a main spring 26 interposed between the collar 14 and a slidable bush 21 screwed into the upper end of the tube 20, a rebound spring 28 being arranged between the bush 21 and a guide collar 22 secured on the lower end of the fixed tube 10 between a spring ring 23 and a screw-plug 24. The upper part of the tube 10 is enclosed in a tubular shield 18, and the spring 26 is enclosed in a telescopic cover 27. The tube 10 may be of greater diameter at the middle of its length where the stresses are greater.