Fastener with multilobular internal recess and tool entry ramps

Details Fastener with multilobular internal recess and tool entry ramps Fastener with multilobular internal recess and tool entry ramps

1991-10-16

1992-12-15

Wilson, Neill A.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Head driving structure

411919, 811211, F16B 2300, F16B 3506

Patent

active

051711176

ABSTRACT:
A recessed drive socket in a fastener or the like, is driven by a mating, drive tool received within the socket. The socket cavity has a multilobular cross-section defined by an alternating annular series of adjacent socket flutes and socket lobes extending parallel along a general central axis from an entrance opening into the cavity circumscribed by a peripheral support collar. Each socket lobe is truncated by a guide surface inclined from the opening at a radially outer edge of an adjacent socket flute into the cavity to form a tool clearance recess portion of the guide surface which defines the radial outer edge of the adjacent flute. The guide surface extends from the tool clearance recess portion to a termination of the guide surface within the cavity axially recessed from the cavity opening in order to provide cammed guidance of drive lobes on the drive tool against the inclined guide surface into the respective socket flutes and to prevent driving engagement of the drive lobes with the socket lobes until the cammed guidance results in axially extended depth of the drive lobes into the socket flutes for efficient and balanced torque transmission.

REFERENCES:
patent: 2777353 (1957-01-01), Willis
patent: 3253625 (1966-05-01), Oestereicher
patent: 3620106 (1971-11-01), Dixon

Affiliated with

Also associated with

Rating

Fastener with multilobular internal recess and tool entry ramps does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fastener with multilobular internal recess and tool entry ramps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fastener with multilobular internal recess and tool entry ramps will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2088512