Locking structure of cylindrical building members and machining

Details Locking structure of cylindrical building members and machining Locking structure of cylindrical building members and machining

1997-08-20

2000-01-11

Kim, Harry C.

Joints and connections

Biased catch or latch

403290, 403404, F16B 220

Patent

active

060128682

ABSTRACT:
The locking structure of this invention comprises: a gate pillar (1) as a first cylindrical member; a cover (2) as a second member fitted into the first member; locking projections (6) provided to an inner surface of the first member or to an outer surface of the second member, each of the locking projections comprising an inclined surface (6a) progressively rising from the front end side of one of the mating members, from which the other mating member is inserted, toward the rear end side and a locking surface (6b) formed at the rear end of the inclined surface (6a); and locking steps (7) formed in the other member and adapted to engage the locking surfaces (6a) when the two mating members are fitted together. The machining apparatus (A) forms the locking projections (6) by pressing blade portions (9) of tools (8) against the inner surface of the gate pillar (1) with impacts.

REFERENCES:
patent: 367578 (1887-08-01), Babb
patent: 2063895 (1936-12-01), Mack
patent: 2496700 (1950-02-01), Cole
patent: 2644475 (1953-07-01), Morton
patent: 2909957 (1959-10-01), Rapata
patent: 3131899 (1964-05-01), Luhrs
patent: 3485006 (1969-12-01), De Rozario
patent: 3785584 (1974-01-01), Crellin, Jr.
patent: 4694544 (1987-09-01), Chapman
patent: 5247549 (1993-09-01), Cearley et al.
patent: 5651632 (1997-07-01), Gordon
patent: 5807012 (1998-09-01), Emmert et al.

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