Patent ID: 8151666

Claim:
A twist activated vehicle control with integral hydraulic master cylinder comprising; an inner stem in the form of a cylinder having a proximate end, an open distal end, an inner bore, an outside circumference, a longitudinal axis, an outlet port in the proximate end, a forward and rear supply port, and a longitudinally oriented guide cam being a slot cut along the length near the distal end, the proximate end having a means for receiving a tubular handle bar handlebar, a hydraulic fluid reservoir clamped around the inner stem in direct fluid communication with forward and rear supply ports of the inner stem, a hydraulic piston having a front end, a rear end and forward and rear seals, the piston being inserted in the inner bore of the inner stem being responsive to a return spring between the front end of the hydraulic piston and the proximate end of the inner stem and is positioned to interact with the inner stem forward and rear supply ports such that the rear supply port is positioned between the forward and rear seals and the forward supply port is positioned between the forward and rear seals of the hydraulic piston during activation and forward of the hydraulic piston forward seal when deactivated, a hydraulic follower, having a cylinder shape, is slidably positioned within the inner bore of the inner stem and adjacent to the rear of the hydraulic piston, the hydraulic follower further having a perpendicularly mounted bearing assembly having an upper and a lower bearing with the lower bearing positioned within and to follow and interact with the guide cam of the inner stem, a helical cam sleeve being a tubular shaped surrounding and axially rotatable around the circumference of the inner stem having a helical cam having at least one cam surface portion receiving the upper bearing of the hydraulic follower bearing assembly whereby a twisting action in one direction of the helical cam sleeve around the inner stem delivers hydraulic fluid from the hydraulic fluid reservoir at a pressure and volume proportional to degree of motion out the outlet port of the inner stem; and, a thrust bearing longitudinally securing the helical cam sleeve to the inner stem whilst allowing rotation of the sleeve around the inner stem, the thrust bearing being fixed to the distal end of the inner stem so as to accommodate rearward thrust of the helical cam sleeve.