Friction fit knob for shaft with end of U-shaped cross-section

Details Friction fit knob for shaft with end of U-shaped cross-section Friction fit knob for shaft with end of U-shaped cross-section

1992-06-09

1993-03-30

Sipos, John

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Sash balances

Spring

16DIG30, 74553, 403361, A47B 9502, G05G 110, B25G 302

Patent

active

051971615

ABSTRACT:
A molded knob of the type which frictionally engages and fits over the end of a shaft, which shaft end is of generally U-shaped, transverse cross-section created by the removal of a portion of a circular tubular shaft. A hub is formed as part of the knob. A shaft-receiving socket of generally circular, transverse cross-section is formed in the hub. A pair of generally L-shaped fingers are formed as part of the hub and extend the depth of the socket. The L-shaped fingers are positioned back-to-back to define a U-shaped slot between the fingers and hub, which U-shaped slot receives the U-shaped end of the shaft. Each L-shaped finger has a base portion which is molded integrally with the core and a back portion which extends cantileverly from the base portion, with the base and back portions connected by an integral hinge. The back portions of the L-shaped fingers are spaced from each other about their integral hinges and are flexible so as to bend toward each other when the shaft is inserted in the socket. The back portions of the fingers have bulbous protrusions near their tips to frictionally engage the inside surface of the U-shaped shaft end as torque is applied to the knob.

REFERENCES:
patent: 3193312 (1965-07-01), Ehner
patent: 3336059 (1967-08-01), Leitmann
patent: 3679252 (1972-07-01), Howie, Jr.
patent: 4179771 (1979-12-01), Rankins et al.
patent: 4295246 (1981-10-01), Howie, Jr.
patent: 4441230 (1984-04-01), Howie, Jr.
patent: 4923325 (1990-05-01), Howie, Jr.

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