Keeper spring for connecting mining tool to work tool holder

Details Keeper spring for connecting mining tool to work tool holder Keeper spring for connecting mining tool to work tool holder

1980-06-17

1982-05-04

Purser, Ernest R.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Tooth mounted on helical head portion or head with helical...

279 197, 299 92, 407102, 411517, 411521, E21C 3518

Patent

active

043279473

ABSTRACT:
A keeper spring for mounting a rotatable mining tool in the bore of a supporting block is formed of a unitary, metallic spring material, and includes a cylindrical member which is split along its axial length so as to be radially expansible and contractable, thereby defining a first spring portion. Three, equally spaced elongated arcuate, leaf spring protuberances project radially outwardly of the central region of the cylindrical member and are aligned with the axial length of the cylindrical member. Each protuberance is formed by providing two parallel slits in the wall of the cylindrical member, after which the material intermediate the slits is indented outwardly so as to effectively define a second spring portion. When assembled on the shank of the mining tool, and disposed within the bore of the support block, the second spring portions engage an annular recess in the bore, and are maintained in the locked position by virtue of the resiliency of the leaf springs in addition to the resiliency of the cylindrical member.

REFERENCES:
patent: Re29900 (1979-02-01), Kniff
patent: 3462726 (1969-08-01), Stark et al.
patent: 3519309 (1970-07-01), Engle et al.
patent: 3752515 (1973-08-01), Oaks et al.
patent: 3767266 (1973-10-01), Krekeler

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