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US4577735: Shock absorber for quartz crystal enclosures using multiple contact points to distribute stress


Filing Information

Inventor(s) Charles W. Mooney · Robert E. Phipps · William J. Kuznicki ·
Assignee(s) Motorola, Inc. ·
Attorney/Agent(s) Mark P. Kahler ·
Primary Examiner Duane A. Reger ·
Application Number US6627248
Filing date 07/02/1984
Issue date 03/25/1986
Predicted expiration date 07/02/2004
U.S. Classifications 188/268  · 267/153  ·
International Classifications F16F 700  ·
Kind CodeA
International Classifications 188268;379;380 ·
6 Claims, No Drawings


A shock absorbing mechanism for protecting a fragile quartz crystal includes a Teflon coating on the internal surface of the crystal enclosure. The enclosure is provided with a plurality of detents arranged so that when the crystal is shocked in its most fragile plane a plurality of these Teflon coated detents are struck simultaneously to distribute the shock across the surface of the crystal.

Independent Claims | See all claims (6)

  1. 1. A shock absorbing mechanism for protection of a planar crystal device against impact with a crystal enclosure wall, said crystal device having opposed major surfaces, said shock absorbing mechanism comprising:shock absorbing means having a plurality of deformable protuberances for contacting one as said major surfaces when said crystal device is subjected to mechanical shock; andcarrier means for holding said shock absorbing means between one of said major surfaces and said enclosure wall so that said plurality of deformable protuberances contact one of said opposed major surfaces substantially simultaneously when said crystal device is shocked by a force exceeding a predetermined magnitude in a direction toward said shock absorbing means and substantially perpendicular to said opposed major surfaces.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US2352311 EDISON INC THOMAS A Di Toro Jun 1944
US2384757 KUENSTLER WALTER E Kuenstler Sep 1945
US2546321 Ruggles Mar 1951
US2676275 RCA CORP Bigler Apr 1954
US3113223 SPACE TECHNOLOGY LAB INC Smith et al. Dec 1963
US3423542 ASTATIC CORP Cvetko Jan 1969
US3619672 MATSUSHITA ELECTRIC IND CO LTD Nagata et al. Nov 1971
US3980022 LUNGO ANTONIO Lungo Sep 1976
US3986150 Matsushita Electric Industrial Co., Ltd. Tanaka et al. Oct 1976
US4078635 Harris Corporation Dance et al. Mar 1978

Referenced By

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