Appeal No. 2005-0948 Page 5
Application No. 09/922,938
extending longitudinally of said housing and disposed through a bore in said
slider block, and a locking piston vertically slidably disposed in said slider block,
said locking piston having a bore for being aligned with said bore of said slider
block to receiving said locking shaft and having a shaft for being detachably
mounted to said locking plate, whereby rotation of said locking shaft about the
longitudinal axis thereof lifts said locking piston and the locking plate mounted
thereto while pressing said block so as to clamp said housing to a bedway
between the slider block and the locking plate.
Clay's invention relates to slide rests suitable for lathes. Figures 1 to 4 show a
clamping mechanism for locking a banjo1 10 to the support rail or rails of a lathe bed.
As shown in Figures 2-3, the clamping mechanism includes a cylindrical cam 13
attached to and supported by two bearing members 15. The cam 13 and the coaxial
bearing members 15 form a continuous hollow cam shaft 40 having a square
passageway 16 of uniform transverse dimensions. The center axis of the cam 13 is
offset from and parallel to the axis of the bearing portions. A support block 12 has two
semi-cylindrical concave support surfaces 17 which support the bearing members 15 of
the cam shaft 40. The bearing members can easily rotate on the surfaces 17.
1A support bar which is the top member of a toolrest bracket is referred to in the
art as a banjo. A banjo consists of a horizontal support which is secured onto the
support rails of a lathe bed by way of a clamping mechanism. A vertical portion of the
banjo extends upwardly at one end. A top horizontal support bar which is rotatably
disposed on the vertical portion of the banjo constitutes the actual toolrest.
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