Abstract A double-eccentric variable drive system is disclosed comprising a drive shaft, two eccentrics mounted on the drive shaft to be driven thereby, and means for varying the eccentricity of both of the eccentrics simultaneously. The means in question comprises a spindle having left-hand screw-threads on one end thereof and right-hand screw-threads on the other end thereof and an enlarged central portion rotatably mounted in the shaft but radially fixed relative thereto. The eccentrics each have a radial bore therethrough tapped to correspond with and receive the threads of the spindle, the bores being aligned on opposite sides of the shaft. Each eccentric has an axial bore larger than the diameter of the shaft in a direction parallel to the spindle to allow for movement of the eccentrics radially of the shaft. The arrangement is such that rotation of said spindle in one direction will simultaneously increase the eccentricity of both of the eccentrics relative to the shaft and rotation of the spindle in the other direction will simultaneously decrease the eccentricity of both of the eccentrics relative to the shaft. Preferably, the eccentrics each have a dovetail slide and a diametrically opposite dovetail, the dovetail of one eccentric slidably engaging in the dovetail slide of the other eccentric and vice versa, each dovetail having said radial bore passing therethrough. The system is particularly adapted for use in solvent extraction.
A double-eccentric variable drive system comprising a drive shaft, two eccentrics mounted on said drive shaft to be driven thereby, and means for varying the eccentricity of both of said eccentrics simultaneously, said means comprising a spindle having left-hand screw-threads on one end thereof and right-hand screw-threads on the other end thereof, said spindle having an enlarged central portion rotatably mounted in said shaft but radially fixed relative thereto, said eccentrics each having an annular surface carrying a bearing which in turn carries a connecting rod and said eccentrics each having a radial bore therethrough tapped to correspond with and receive the threads of said spindle, said bores being aligned on opposite sides of said shaft, each eccentric having an axial bore larger than the diameter of the shaft at least in a direction parallel to said spindle to allow for sliding movement of the eccentrics with respect to each other radially of the shaft, means for rotating said spindle in one direction to simultaneously increase the eccentricity of both of said eccentrics relative to said shaft and for rotating said spindle in the other direction to simultaneously decrease the eccentricity of both of said eccentrics relative to said shaft.
Claim 2
Dependent Claim
200 words
A double-eccentric variable drive system comprising a drive shaft, two eccentrics mounted on said drive shaft to be driven thereby, and means for varying the eccentricity of both of said eccentrics simultaneously, said means comprising a spindle having left-hand screw-threads on one end thereof and right-hand screw-threads on the other end thereof, said spindle having an enlarged central portion rotatably mounted in said shaft but radially fixed relative thereto, said eccentrics each having an annular surface carrying a bearing which in turn carries a connecting rod and said eccentrics each having a radial bore therethrough tapped to correspond with and receive the threads of said spindle, said bores being aligned on opposite sides of said shaft, each eccentric having an axial bore larger than the diameter of the shaft at least in a direction parallel to said spindle to allow for sliding movement of the eccentrics with respect to each other radially of the shaft, means for rotating said spindle in one direction to simultaneously increase the eccentricity of both of said eccentrics relative to said shaft and for rotating said spindle in the other direction to simultaneously decrease the eccentricity of both of said eccentrics relative to said shaft.
Claim 3
Dependent Claim
49 words
A double-eccentric variable drive system as claimed in claim 1, wherein said eccentrics each have a dovetail slide and a diametrically opposite dovetail, the dovetail of one eccentric slidably engaging in the dovetail slide of the other eccentric and vice versa, each dovetail having said radial bore passing therethrough.
Claim 4
Dependent Claim
53 words
A double-eccentric variable drive system as claimed in claim 1, wherein said shaft has a cruciform slot extending inwardly from an end thereof to receive the central portion of said spindle, said shaft being strengthened by a cruciform member inserted in said slot after the central portion has been placed in the slot.
Claim 5
Dependent Claim
51 words
A double-eccentric variable drive system as claimed in claim 1, wherein said eccentrics have their mutually remote faces engaged by clamping rings, one of which is adjacent the end of the shaft and engaged by a clamping nut screwed on that end while the other engages a collar on the shaft.