Tools – Wrench – screwdriver – or driver therefor – Rigid jaws
Patent
1975-01-27
1976-01-06
Smith, Al Lawrence
Tools
Wrench, screwdriver, or driver therefor
Rigid jaws
85 35, B25B 1306, F16B 3700
Patent
active
039304280
ABSTRACT:
Theft resistant combination lug nut apparatus including a nut formed with an internally threaded annular bearing ring formed on one end with a radially extending shoulder, such nut projecting axially outwardly from such ring to form a conical axially elongated centering dome. The bearing ring is formed with a plurality of diametrically unopposed radially outwardly facing chordal index facets arranged in a pattern defining a selected combination and extending axially along the periphery of the ring and spaced to form, at locations opposite all such facets, rounded slip surfaces. A key device is formed with an open ended shell defining a cylindrical socket for closely overfitting the slip surfaces of such bearing ring and is formed on its interior with a plurality of index surfaces arranged in a pattern to closely fit over the facets on such ring whereby the key device may be telescoped axially over such centering dome to be aligned axially with the ring and then rotated to register the key surfaces with the respective facets and then slid axially onto such ring so rotative forces can be applied thereto and only tangential forces will be applied to such facets.
REFERENCES:
patent: 1447564 (1923-03-01), Norlund et al
patent: 3364806 (1968-01-01), Chaivre
patent: 3874258 (1975-04-01), Senola et al.
Smith Al Lawrence
Smith James G.
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