| 摘要 |
1,188,208. Back facing tools. ENGLISH ELECTRIC CO. Ltd. 22 Aug., 1968 [1 Sept., 1967], No. 40015/67. Heading B3C. A rotary back facing tool comprises a longitudinally extending body long enough to pass through an aperture 13 in a workpiece 12, a cutter 20 pivoted at one end of the body on a transverse body axis, means for mounting the tool in a rotary cutting machine at the other end of the body, and a fluid-pressure operated actuating member 25 in the body and movable between a first position in which the cutter is retracted in the body and a second position in which the actuating member holds the cutter extended laterally from the body. Preferably one side each of the cutter and slot 21 in the body have corresponding tapered surfaces which interengage in the second or extended position (Fig. 10, not shown). The actuating member has two studs 24 and 48, which respectively engage a cam track 23 in the cutter and support the edge 20A of the cutter when it is extended, and is movable by compressed air selectively supplied to the two sides of a piston 26, secured to the member 25, from a control valve 18 through lines 16, 17 and a non-rotating connector 15. A modified tool (Fig. 11, not shown) has a shank (29) integral with the main body (58) and a piston acting in an annular chamber bounded by the body and the non-rotating connector. |
