Hand tool stop pin
A hand tool such as a folding knife that incorporates a blade stop pin that stops rotation of the blade in the open position is described. The stop pin defines a multifaceted face having plural surfaces, each having a radial distance from an axial centerline that is different from adjacent surfaces. Rotation of the stop pin allows for adjustment of the stop position of the blade.
1. In a folding tool having an elongate body and an implement, wherein the body includes two opposed sidewalls held in a spaced apart relationship defining a slot therebetween, the implement is rotatably attached to the body and is rotatable from a first position in which the implement is at least partially received in the slot and a second position in which the implement is at least partially rotated out of the slot for use, the improvement comprising:
an elongate stop pin having a longitudinal axis, first end and a second end, a first cylindrical outer surface adjacent the first end, a second cylindrical outer surface adjacent the second end, and a central portion between said first and second cylindrical outer surfaces, said central portion defined by a plurality of planar surfaces parallel to the longitudinal axis, a first axial bore in the first end having a first diameter, said first axial bore extending partially along the length of the stop pin and terminating at a shelf, and a second axial bore extending from said shelf at least partially toward said second end, said second axial bore having a smaller diameter than said first axial bore;
whereby said first cylindrical portion is rotatably received in a first cylindrical bore extending partially through the first sidewall and said second cylindrical portion is rotatably received in a second cylindrical bore in the opposite sidewall such that the central portion lies in the slot, the first sidewall having a hole extending therethrough into the first cylindrical bore and aligned with said first axial bore in the stop pin; and
wherein the shortest radial distance from the longitudinal axis to each of the plurality of planar surfaces is different for each planar surface.
2. The folding tool according to claim 1 wherein the first axial bore in the stop pin is threaded and the hole in the first sidewall has a diameter that is smaller than the diameter of the first cylindrical bore in the first sidewall and wherein the stop pin is fixed relative to the first sidewall to prevent axial rotation of said stop pin with a screw inserted through the hole and threaded into the first axial bore.
3. The folding tool according to claim 1 , wherein the shortest radial distance from the axis to a first planar surface is equal to the radial distance from the axis to the first cylindrical outer surface.
4. The folding tool according to claim 3 wherein the shortest radial distance from the axis to the planar surface adjacent the first planar surface is greater than the shortest radial distance from the axis to the first cylindrical outer surface.
5. The folding tool according to claim 1 including N planar surfaces P in the central portion, represented by P 0 , P 1 , P 2 . . . P N , and wherein the shortest radial distance from the axis to each of the N planar surfaces is different for each such surface.
6. The folding tool according to claim 5 wherein the shortest radial distance from the axis to a planar surface is represented by R so that for each of the planar surfaces P there is a corresponding distance R, and wherein R 0 <R 1 <R 2 . . . <R N .
7. The folding tool according to claim 5 wherein one of the planar surfaces defines a reference surface and includes a reference indicia.
8. The folding tool according to claim 1 wherein the second axial bore is defined by a hexagonal opening.