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US 4,229,127 AGranted
Boring bar
AssigneeKennametal Inc.
InventorDonald L. Bartley
Life of this patent
Estimating the term…
Abstract
A collapsible boring bar is disclosed having radially movable tool units on its outer periphery. The tool units are moved radially by an axially slidable ramp means that acts on cylindrically shaped rollers. The ramp means are located in grooves formed in a tapered spacer element that is located within the head of the boring bar.
Claims3
A collapsible boring bar which comprises:
- a drawbar;
- piston means connected to one end of said drawbar;
- a head with a first end telescopically engaging said piston means;
- a spacer telescopically engaged with and abutting a second end of said head;
- ramp means axially slidable on said spacer and rigidly connected to said piston;
- at least one radially movable tool unit mounted on the periphery of said head;
- cylindrically shaped roller means located on said head, said roller means being interposed between said ramp means and said individual tool units and abutting with line contacts said individual ramp means and said individual tool unit so that axial movement of said piston moves said tool units in a radial direction.
4 more elements
Dependencies are inferred from the claim text.