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US 4,619,567 AGranted
Bit holder with impact release mechanism
OwnerJames H. Campbellinventor
Life of this patent
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Abstract
A bit holder for automatic printed circuit board drilling machines, the bit holder incorporating a snap ring as a retaining mechanism that releases under abnormally high impact conditions to prevent damage to the bit holder parts.
Claims1
A drill bit holder for automatic drilling machines which limits impact stresses comprising:
- an elongated hollow cylindircal-shaped housing,
- a hollow elongated cylindircally-shaped gripper means for slidably fitting into one end of said housing a predetermined distance with at least a part of it extending axially outwardly of the other end of said housing for gripping a bit,
- a coiled spring means for slidably fitting into said one end of said housing for bearing at one end against said gripping means, and
- a disc-shaped snap ring comprising a convex shaped peripheral edge for detachably engaging the inside surface of the hollow interior of said one end of said housing and a face having a centered circular depressing for engaging one end of said spring means for holding said spring means in said housing under tension,
- said inside surface of the hollow interior or said one end of said housing being provided with an annular groove for receiving in a mating relationship the peripheral edge of said disc-shaped snap ring,
- said disc-shaped snap ring being formed of a flexible, resilient self-lubricating material and having an aperture extending axially therethrough with a radial slot extending from said aperture to its peripheral edge.
3 more elements
Dependencies are inferred from the claim text.