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CAM LINKAGE BETWEEN SOLENOID AND LOAD TO MATCH SOLENOID OUTPUT CHARACTERISTICS TO LOAD

IP.com Disclosure Number: IPCOM000026973D
Original Publication Date: 1994-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 100K

Publishing Venue

Xerox Disclosure Journal

Abstract

The output force characteristics of a solenoid varies with its stroke or activation position. The load force requirements of the particular function or operation of the solenoid also usually vary with movement position. Thus, seldom is there an accurate match of the solenoid output force to the force requirements of its load over its stroke or pull-in movement range. Various linkage systems that connect solenoids to their loads have been developed to better match their respective characteristics. One example is in a Xerox Disclosure Journal publication Vol. 7, No. 5, September/Oitober, 1982, pages 305-306.

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XEROX DISCLOSURE JOURNAL

CAM LINKAGE BETWEEN Proposed Classification SOLENOID AND LOAD TO MATCH
SOLENOID OUTPUT
CHARACTERISTICS TO LOAD
Raymond E. Poehlein

U.S. C1.335/285 Int. C1. HOlf 7/20

The output force characteristics of a solenoid varies with its stroke or activation position. The load force requirements of the particular function or operation of the solenoid also usually vary with movement position. Thus, seldom is there an accurate match of the solenoid output force to the force requirements of its load over its stroke or pull-in movement range. Various linkage systems that connect solenoids to their loads have been developed to better match their respective characteristics. One example is in a Xerox Disclosure Journal publication Vol. 7, No. 5, September/Oitober, 1982, pages 305-306.

The present system uses a variable cam and pulley system as a linkage between a solenoid and its load. Thus, the load may be more reliably operated without requiring a larger than necessary solenoid and excessive power requirements. In the specific example, the solenoid shaft or plunger when retracted pulls a solenoid cable, wire or cord, which is at least partially wrapped around a conventional simple cylindrical pulley. Commonly mounted on the same axis as this cylindrical pulley is a non-uniform radius cam pulley. This variable radius pulley then in turn pulls or wraps up a load cable to pull the load.

The effectively variable lever arm distance' due to the variable radius of the variable radius pulley is selected to vary the effective force required to rotate it which is provided by its coaxial pulley being rotated by the solenoid. Thus, selection of the v...