US 2011/0253458 A1Published application

Percussion hammer bit retention system

OwnerDanny Robey, Todd Taylorinventors

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Abstract

A percussion hammer bit retention system including a retainer having at least three (3) tabs, a hammer bit having first and second elevated surfaces that each define pathways and slot openings for rotational receipt of the tabs, and a custom chuck further including slot openings for receipt of the tabs. The application of tabs in combination with the elevated surfaces and indexed slot openings distinguish the present invention over the prior art. In application, in order to fully separate the retainer from the assembly, the tabs are indexed in a manner that only allows them to pass through the aligned slot openings on the first elevated surface in one (1) position every 360 degrees, and then through the aligned slot openings on the second elevated surface in one (1) position every 360 degrees, and then through the indexed slots on the custom chuck in one (1) position every 360 degrees.

Claims19

Dependent claims

A percussion hammer bit retention system comprising:

a retainer;
a hammer bit;
and
a custom chuck;
wherein said retainer includes an inner surface having a plurality of tabs spaced about the circumference of a lower end of the inner surface, and an edge disposed on an upper end of the inner surface;
wherein said custom chuck includes a ledge disposed on an outer surface, wherein said edge is in abutting communication with the ledge, said ledge further defines a plurality of spaced indexed slots, the number of indexed slots being at least equal to the number of tabs on the retainer such that the tabs can be aligned with the indexed slots;
wherein said hammer bit defines a first elevated surface and a second elevated surface and a pathway therebetween, said first elevated surface having a plurality of spaced first slot openings, the number of first slot openings being at least equal to the number of tabs on the retainer such that the tabs can be aligned with the first slot openings, said second elevated surface includes a plurality of spaced second slot openings, the number of second slot openings being at least equal to the number of tabs on the retainer such that the tabs can be aligned with the second slot openings, wherein said first slot openings are not in vertical alignment with said second slot openings and, said indexed slots are not in vertical alignment with said second slot openings.

4 more elements

Dependencies are inferred from the claim text.