Tools – Wrench – screwdriver – or driver therefor – Spanner
Patent
1983-06-27
1987-06-30
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Spanner
81128, B25B 1310
Patent
active
046761268
ABSTRACT:
An adjustable wrench head (10) is disclosed for use in conjunction with spanner nuts of various sizes, each spanner nut having a plurality of locking recesses therein. More particularly, a wrench head is provided which includes a central elongated driving spindle (20) having a plurality of opposed pairs of planar guide rails (22, 24) projecting radially outwardly therefrom. Each pair of guide rails defines a channel (26), which is adapted to receive a generally rectangular insert (28), with the insert being radially movable therein, relative to the central spindle. Each insert is provided with a tang (30) which projects axially beyond the front end of the spindle for engagement with a locking recess of the spanner nut. The radial position of the inserts are adjusted and secured such that the tangs thereof are spaced from the center of the spindle a distance corresponding to the radius of the spanner nut. Preferably, a plurality of planar webs (34) are provided which extend between one guide rail (22) of one pair and the adjacent guide rail (24) of another pair. The planar webs (34) function to add structural rigidity to the wrench head (10) and prevent deflection of the guide rails.
REFERENCES:
patent: 976391 (1910-11-01), O'Hare
patent: 1263202 (1918-04-01), Brown
patent: 2389954 (1945-11-01), Burns
patent: 2403264 (1946-07-01), Cormier
patent: 2803981 (1957-08-01), Stoecker
Avco Corporation
Meislin Debra S.
Schmidt Frederick R.
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