The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1981
Filed:
Oct. 12, 1979
Frederick J Adams, Clevedon, GB;
Cam Gears Limited, Hertfordshire, GB;
Abstract
A rotatable input shaft (1) drives a rotatable output shaft (18) through a roller (7) which roller is displaceable along its rotational axis (8) while maintaining driving engagement with drive faces (6 and 14) of the shafts (1 and 18) respectively to vary the drive ratio through the assembly. The roller (7) is controlled in its displacement by a piston and cylinder device (10, 11) to which fluid pressure is directed under control of a spool valve (22). The spool (26) of valve (22) is displaceable to determine fluid flow towards and from the piston chambers (12 and 13) of the piston and cylinder device under control of the speed of rotation of the output shaft (18) through a centrifugal governor (34) and a push rod (33) reacting between the spool (26) and the governor (34). If the rotational speed of shaft (18) varies substantially from a predetermined value (for example by variations in rotational speed of the input shaft (1)) the governor (34) reacts to displace the spool (26) in a manner which directs fluid pressure to piston chambers (12 and 13) and displaces the roller (7) in a sense to increase or decrease the mechanical advantage at which drive is transmitted between the input and output shafts to adjust the rotational speed of the output shaft (18) and maintain it substantially constant.