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Browse Prior Art Database

Spring Clutch Actuator

IP.com Disclosure Number: IPCOM000095652D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Duncan, PM: AUTHOR [+2]

Abstract

The assembly actuates a spring clutch with controlled, low friction. Clutch actuator shoe 1 is moved by actuator spring 3 in such a manner that the yield of spring 3 prevents excessive friction from occurring.

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Spring Clutch Actuator

The assembly actuates a spring clutch with controlled, low friction. Clutch actuator shoe 1 is moved by actuator spring 3 in such a manner that the yield of spring 3 prevents excessive friction from occurring.

The helical clutch spring 5 overlaps two coaxial shafts. Only one shaft 7 is shown. The clutch spring 5 has an inside diameter slightly larger than the diameter of the shaft 7 and the coaxial shaft, not shown. To engage the clutch, actuator shoe 1 must force spring 5 into the shaft 7. At this time spring 5 wraps up around both shafts to transmit torque from shaft 7 to the coaxial shaft.

To engage the clutch, link 9 is pulled in the direction of the arrow. Link 9 moves lever 11 which is pivoted at stud 13. Actuator shoe 1 is pivoted on lever 11 at stud 15 and is connected to spring 3, a leaf spring. Lever 11 carries adjustable projection 17. Movement of lever 11 thus brings projection 17 into actuator spring 3 so that actuator shoe 1 properly engages spring 5. Yield of spring 3, however, moderates the force of engagement. The shoe 1 carries an extension 19 so that shoe 1 is restored by the adjustable projection 17 when the link 9 is restored.

The device has several advantages. Excessive and unnecessary frictional losses do not occur at the actuator shoe 1. Tolerances in the linkages need not be critical because the spring 3 moderates force at actuator shoe 1 which would otherwise be excessive. The system is easily adjusted during assem...