Method and apparatus for pre-creeping a greater than required st

Details Method and apparatus for pre-creeping a greater than required st Method and apparatus for pre-creeping a greater than required st

1995-11-21

1998-02-24

Bryant, David P.

Metal working

Method of mechanical manufacture

Assembling or joining

206523, 723792, B65D 8584, B23P 1102, B21D 3100

Patent

active

057200947

ABSTRACT:
Method and apparatus for pre-creeping a force applying spring blade member having characteristics for ordinarily generating a higher than required initial force in a controlled force applying process. The apparatus includes a retainer that can be packed and sealed within storable container. The retainer includes a first set of walls defining a first slot for receiving and retaining a first edge of a generally rectangular spring blade member, and a second set of walls defining a second slot for receiving and retaining a second and opposite edge of the blade member. The second slot is in communication, and forms a blade creeping angle, with the first slot. The blade creeping angle and a controlled aging period of time for a packaged blade member are selected so as to cause the blade member to precreep through a precreep phase during the controlled period of time in accordance with a bend induced therein at the blade creeping angle. The precreeped blade member can then be mounted within the controlled force applying process to generate an initial high desired force within a desired force range of the process, and to thereafter exhibit a reduced creep rate over a life of the blade member in the process, thus resulting a longer blade life.

REFERENCES:
patent: 4373371 (1983-02-01), Liu
patent: 5277723 (1994-01-01), Kodama et al.
patent: 5300335 (1994-04-01), Miyazawa et al.
patent: 5311760 (1994-05-01), Thompson
patent: 5395565 (1995-03-01), Nagaoka et al.

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