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Use of Stacked Rings to Minimize Backlash in Body Lock Rings

IP.com Disclosure Number: IPCOM000208069D
Publication Date: 2011-Jun-21
Document File: 1 page(s) / 23K

Publishing Venue

The IP.com Prior Art Database

Abstract

The purpose of this invention is to eliminate or minimize backlash in a body lock ring (BLR) system that will maximize the amount of energy stored in compressive seals. The current most widely used BLR system contains a thread that mates on a matching thread profile of a mandrel. The distance between threads is the backlash amount and is usually between .040” - .060”. This invention uses a set of stacked c-rings or retaining rings that drop into a groove as a seal that is compressed. The width of the rings becomes the maximum amount of backlash. A housing comprising of a high load spring and stacked rings is assembled into a mandrel. The mandrel has a reduced diameter at a specified location. The location is dependent on the amount of travel needed to set. A part with a “latch” is held against the shoulder of the reduced diameter by a 2nd spring. As the housing is moved it connects into the latch. Further movement will move the latch away from the shoulder which will introduce a groove. The spring in the housing will push the trapped rings into the groove as the housing is moved. Alternate methods could include any matter that could be carried in a housing and dropped into a groove or void. Use of c-rings or retaining rings minimize backlash but do not eliminate it.

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