F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/143
F16B 43/00 (2006.01) F16B 39/26 (2006.01)
Patent
CA 1150989
FASTENER AND WASHER ASSEMBLY ABSTRACT Disclosed is a preassembled fastener and washer assembly comprising a threaded fastener including an enlarged head and having a shank with a helical thread which has a predetermined maximum thread crest diameter, the upper extremity of the fastener threads being spaced a predetermined distance from the lower extremity of the head thereby defining an unthreaded portion. The unthreaded portion includes an annular ledge having a diameter greater than the crest diameter. The domed washer has an inner and an outer periphery which define a predetermined axial length, the axial length being such that when the washer's inner periphery is in abutment with the lower extremity of the fastener head, the outer periphery of the washer is axially located beyond the unthreaded portion and peripherally adjacent at least one convolution of a fully formed thread. The washer has a fastener receiving hole therein which has a diameter greater than the thread crest diameter but less than the diameter of the annular ledge whereby the washer is held captive on the fastener by the annular ledge. The inner periphery of the hole has a portion reduced in thickness from that of the remaining portion of the washer in order to increase the flexibility of the inner periphery.
362871
Illinois Tool Works Inc.
Meredith & Finlayson
LandOfFree
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