Joints and connections – Interfitted members – Socket
Patent
1989-04-07
1990-05-08
Kundrat, Andrew V.
Joints and connections
Interfitted members
Socket
16121, 74553, 292349, B25G 302
Patent
active
049233254
ABSTRACT:
A molded knob of the type which frictionally engages and slips over the end of a shaft. The knob has a hub with a shaft-receiving socket formed therein. Elongated fingers, which are formed as part of the hub, extend into the socket to engage the shaft. In one embodiment of the invention, a pair of elongated fingers extend generally radially into the socket, with each finger terminating in a tip located close to but out of contact with the top of the other finger. The tips of the fingers are contacted by the curved outer surface of the shaft when the shaft is inserted in the socket to compress the fingers. If desired, the fingers can be designed to bend them into contact with each other so that the loading from one finger to the other acts like a truss. In a second embodiment of the invention, the elongated fingers are curved non-radially relative to the shaft and extend toward each other, terminating short of contact with the tips of each other. In the third embodiment, the fingers are also curved and extend non-radially relative to the shaft. A first rib is formed on each finger near its tip with each rib projecting into the socket. The first ribs are engaged by the curved outer surface of the shaft to bend the curved fingers away from the flat wall, with the amount of projection of the first ribs determining the amount of bending of the fingers. The fingers also may have second ribs near their bases which are also engaged by the shaft to create a controlled interference fit between the shaft and each of the second ribs. In all embodiments, the tips of the fingers may be notched at the entrance to the socket for a depth of approximately one quarter of the depth of the socket to facilitate the insertion of the shaft into the socket by virtually eliminating friction drag on the shaft during the piloting of the shaft into the socket.
REFERENCES:
patent: 3667787 (1972-06-01), Seymour
patent: 3679252 (1972-07-01), Howie, Jr.
patent: 3880536 (1975-04-01), Petrus
patent: 4094210 (1978-06-01), Wirtz et al.
patent: 4179771 (1979-12-01), Rankins et al.
patent: 4295246 (1981-10-01), Howie, Jr.
patent: 4441230 (1984-04-01), Howie, Jr.
Kundrat Andrew V.
The Grigoleit Company
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