Torque limiting retention subassembly for floating insert thread

Details Torque limiting retention subassembly for floating insert thread Torque limiting retention subassembly for floating insert thread

1997-03-27

1998-07-14

Saether, Flemming

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

Torque responsive nut or bolt driving connection

Resilient connection

411105, F16B 3100, F16B 3900

Patent

active

057794090

ABSTRACT:
A retention subassembly for FI threaded fastener assemblies, which retention subassembly is operative to limit the torque, and consequently, the loads acting on the FI threaded fastener assembly and/or on the components coupled thereby. The retention subassembly includes a cage assembly and a Floating Threaded (FT) insert disposed within an internal chamber of the cage assembly. Furthermore, the FT insert includes a threaded bore for accepting a threaded fastener of the FI threaded fastener assembly. The retention subassembly further comprises a first torque reacting means for reacting torque when the threaded fastener is caused to engage the threaded bore, a means for disengaging the first torque reacting means in response to a threshold magnitude of torque, and a second torque reacting means for reacting torque when the threaded fastener is caused to disengage the threaded bore. The disengagement means may include a spring bias element disposed between an upper end cap of the cage assembly and the FT insert, and an engagement surface formed in combination with the FT insert, which engagement surface has an axial length. The spring bias element is characterized by a predetermined spring rate stiffness and a predefined deflection length which, in combination, produce a spring bias force. The spring bias force is a function of the threshold magnitude of torque and the axial engagement length of the engagement surface is substantially equal to the predefined deflection length of the spring bias element.

REFERENCES:
patent: 3289524 (1966-12-01), Rubin
patent: 3555491 (1971-01-01), Moss
patent: 4609314 (1986-09-01), Metz
patent: 4687392 (1987-08-01), Bidwell
patent: 4692075 (1987-09-01), Matz
patent: 4884930 (1989-12-01), Dobbeler

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