Tool bar holder

Abstract

Apparatus for use in reconditioning engines by reworking or replacing the valve guides and seats thereof, which obviates any need for meticulously positioning a toolholder individually for each valve location. A toolholder bar has one end cross-bored to receive tool-guiding bushings, and the bar has a diametral slot extending axially along a major portion of its length, in alignment with the cross-bore. A pair of V-blocks with clamps is positioned on the head or block being reconditioned and the toolholder bar is positioned in the V-blocks, the arrangement being such that the axis of the bar is aligned with a row of valve locations. Alignment is facilitated by the use of a pair of aligning pins which pass through the slot in the bar after insertion in selected valve guides. When the V-blocks are now secured to the work piece, either of the aligning pins may be removed, and the bar may be slid axially until its crossbore is aligned with the first valve location, where it is clamped. After work at the first valve position is completed the bar simply unclamped and displaced to another position, the remaining aligning pin preventing the bar from rotating in the V-blocks. The bar may be longitudinally articulated, with the slot in a longer portion and the crossbore at the end of a shorter portion: the axis of the knuckle joint between the portions is orthogonal to that of the crossbore. The shorter portion may also be provided with a slot aligned with that in the longer portion.

Dependencies are inferred from the claim text.