Joints and connections – Articulated members – Lockable at fixed position
Patent
1981-02-02
1983-05-31
Shedd, Wayne L.
Joints and connections
Articulated members
Lockable at fixed position
81 531, 343901, F16B 710
Patent
active
043858490
ABSTRACT:
An extensible and retractable rod comprising an outer tubular section and an inner section of substantially constant outside diameter telescopically received in the outer section for extension and retraction relative thereto. The outer section has a first internal shoulder spaced from but relatively close to one end of the section, and a second internal shoulder spaced substantially farther away from said one end, said outer section being dimensioned to have a first inside diameter between said one end of the section and the first shoulder, a second inside diameter greater than the first between the first and second shoulders, and a third inside diameter greater than the second between the second shoulder and the other end of the section. The first inside diameter of the outer section is dimensioned for a relatively close clearance fit between the sections, and the second inside diameter of the outer section is dimensioned for a relatively loose clearance fit between the sections. The inner section has a stop at one end thereof engageable with the second shoulder of the outer section for limiting extension of the two sections relative to one another. The inner section may be releasably locked in an extended position relative to the outer section, with the relatively close clearance fit between the sections rigidly holding the sections in generally coaxial alignment.
REFERENCES:
patent: 2291593 (1942-07-01), Hubbard
patent: 2319992 (1943-05-01), Hubbard
patent: 2344425 (1944-03-01), Snyder
patent: 2606050 (1952-08-01), Morris et al.
patent: 2980456 (1961-04-01), McMullin
patent: 3103375 (1963-09-01), McMullin
patent: 3980409 (1976-09-01), Turner
patent: 4047821 (1977-09-01), Hoke et al.
patent: 4079978 (1978-03-01), McMullin
Crain Enterprises, Inc.
Shedd Wayne L.
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