Patent GB-675655-A (GB)
Title: Improvements in or relating to devices acting with spring effect
IPC: G05G25/00
Filed: 1947-12-24
Abstract: 675,655. Centrifugal governors. TRENKEL, M. S. Jan. 24, 1949 [Dec. 24, 1947; Jan. 24, 1949], Nos. 34282/47 and 1897/49. Class 57 [Also in Group XXXII] The Specification relates to spring devices in which the rate of the device may be adjustable and may be greater or less than the rate or rates of the constituent spring or springs of the device. In the construction shown in Fig. 1, the axial movement of an element 72 of a centrifugal governor relative to a second element 73 axially fixed relative to a base member 81, is controlled by springs 75. The upper abutment of each spring is connected by links 78 to rollers 77 on rails 76. The lower abutments 82 are pivotally secured to a member 80 which may be adjusted axially of the base member 81 by a screw 89. The inclination of the axes of springs 75 may be adjusted by means of a screw 87 and associated nuts 85. In a modification, Fig. 9, (not shown), rollers mounted directly on the abutments 79, engage the lower surface of the members 76. Also the curvature of the right hand member 76 is less than that of the left. The pitch of the thread of the screw 86 may be different at the respective sections which engage the nuts 85. In the construction shown in Fig. 3, a spring 96 acts between a member 95 and a rail 92 angularly adjustable relative to a base 94. The inclination of the axis of the spring 96 is adjustable by a screw 206. The upper end of the spring 96 is linked to a roller 99 which engages the rail 92. Lateral deflection of the,spring 96 is prevented by rollers 209 and rails 211. The spring may be formed in two sections, Fig. 7, (not shown) separated by an abutment which carries rollers also constrained to engage the rails. The roller 99 may alternatively engage a secondary rail, Fig. 4, (not shown), which is pivotally secured to the rail 92 in predetermined angular relation. In the construction shown in Fig. 11, springs 294 control relative movement along an axis XX, of members 291, 293. The inclination of the upper abutments 260 and springs 294 are adjusted by means of a screw 267. The lower abutments carry rollers 296 each of which engages a platform 298, the inclination of which is adjustable relative to the member 293. In a modification of the latter construction, Figs. 2, 3, of Provisional Specification 675,655, (not shown), instead of comprising pivoted abutments, the upper end of each spring is formed with a slide which engages a block pivotally mounted on a horizontal extension of the member 291. In a modification, Fig. 1, of Provisional Specification 34282/47, (not shown) of the last-mentioned three constructions; the platforms 298 are dispensed with, and the member 293 is in the form of an arcuate rail which the rollers 296 engage in a similar manner to the rollers 77 and rails 76 of the Fig. 1 construction. Moreover the springs are encased in telescopic housings. In a further modifiation of the Fig. 11 construction, Fig. 13, (not shown) the upper abutments are freely pivoted to the member 291 while the lower abutments are pivoted' to respective blocks which are in threaded engagement with a screwed rod mounted on the member 293 so that rotation of the rod varies the inclination of the springs. In a further construction, Fig. 12, (not shown), each spring 75 of a construction similar to that shown in Fig. 1 is replaced by the complete device described with reference to Fig. 11.