Releasably interlocked, assymmetrical, lugged flange joint with

Details Releasably interlocked, assymmetrical, lugged flange joint with Releasably interlocked, assymmetrical, lugged flange joint with

1977-06-29

1978-11-14

Shedd, Wayne L.

Joints and connections

Interfitted members

Lugged member, rotary engagement

403335, 403353, 2482223, B25G 300

Patent

active

041253396

ABSTRACT:
A two-part quick-attach detachable, triple-locking connection providing for "two-handed" assembly of cutter-shields to housings in mass production of filament trimmers and the like but requiring "three-handed" disassembly to insure safety in subsequent use of the filament trimmer. An embodiment includes: (1) a housing with a circular interrupted-flange male connection around the lower end periphery, and (2) a shield with a complementary circular interrupted-flange female connection for coaxially yielding to the male flange and, after yielding, for locking to it by a half-turn of relative rotation. The locking is by means of a plurality of inwardly-directed flexible locking fingers, located in the flange interruptions of the female connection and being of a length to snap down into the flange-interruptions of the male connection and prevent unlocking counter-rotation of the male and female connections when they are assembled together. Preferably the locking fingers have a portion with thickness greater than the female flanges which makes locking even more secure, prevents upside-down assembly and helps molding fabrication of the shield. Adjacent the locking fingers may be a plurality of somewhat similar but shorter guiding fingers establishing and maintaining coaxiality of the housing and shield during the initial stages of the coaxial yielding and relative rotation during assembly, and also during the converse late stages of disassembly which requires up-bending of two widely separated locking fingers while simultaneously counter-rotating the housing and shield. Asymmetrical disposition of interrupted flange and finger structure in an embodiment prevents improper assembly.

REFERENCES:
patent: 1786722 (1930-12-01), Reid
patent: 2110135 (1938-03-01), Douglas
patent: 2283974 (1942-05-01), Dillon
patent: 2992323 (1961-07-01), Fletcher
patent: 3600735 (1971-08-01), Jerabek
patent: 3724237 (1973-04-01), Wood

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