Patent GB-642925-A (GB)
Title: Improvements in and relating to a machine-tool vice
IPC: B25B1/10
Filed: 1947-08-28
Abstract: 642,925. Machine tool vices. BAHUAUD, A. A. Aug. 28, 1947, No. 23885. [A Specification was laid open to inspection under Sect. 91 of the Acts, Aug. 28, 1947]. [Class 61(ii)] A machine tool vice which comprises a movable jaw and a shoe adapted to slide on a guide member, secured to a stationary jaw, in a direction at right-angles to the clamping faces of the jaws, locking means being adapted to lock the shoe on the stationary guiding member and clamping means being adapted to move the movable jaw and the shoe a small amount relative to each other, is characterized in that the locking means for said shoe comprise one or a plurality of sliders which slide in one or a plurality of horizontal grooves in the guiding member secured to the stationary jaw and one or a plurality of bundles of juxtaposed blades bearing downwardly on the upper portion of the shoe and upwardly on a horizontal surface of the slider, the blades being so inclined that the relative movement of the movable jaw and the shoe during the clamping increases this slope and causes the shoe and the slider to be locked on said guiding member. A jaw structure movable lengthwise on an extended base 2 of a stationary jaw 1 comprises a movable jaw 4 secured to an inverted U-shaped frame member 5 which is fixed to a rear cross member 11. Flexible metal blades 6, 7 connect the jaw structure to a shoe 8 which is slidable on the base 2. A set, or sets, of T-shaped blades 49 having T-shaped recesses in their bases engage over the heads 51 of a double T-shaped slider, or sliders 52 slidable in one or more grooves 3 formed in the base 2. The upper transverse arms 47 of the T-shaped blades 49 rest on the bearing surfaces 46 formed on the edges of a cavity 44 which is formed opposite each groove 3 at the front of the shoe. A member 57 clamps the blades 49 in position. A spring 62 urges the slider 52 forward in the cavity 44 against stop and lock nuts 60, 61 which are screwed on the outer end of a rod 59 whose inner end is fixed to an abutment 54 formed on the shoe 8. This abutment and one at 55 clamp the base of the blades 49. A screw 13 rotatably mounted in the member 11 passes through apertures in the member 11 and the blade 7 so that when the movable structure comprising members 4, 5 and 11 has been moved forward to clamp a part 18 between the jaws 1 and 4 the tightening of the screw 13 will tend to move the shoe 8 rearwardly, locking the shoe and slider to the guideway. The Specification as open to inspection under Sect. 91 comprises also a machine tool vice as shown in Fig. 1, (Cancelled), wherein the connecting means between a shoe 8 and an extension 2 of a stationary jaw 1 is by means of two bolts 9 each having a cheese-head slidable in an inverted T-shaped groove 3 and a clamping nut 10. The latter may be turned by a wrench or by two cranked arms which each engage a nut 10 at one end and are each connected at the other end to one of a pair of nuts which engage oppositely pitched threads on one half of a transverse operating rod- Springs 6, 7 connecting the movable jaw structure to the shoe act to hold the movable jaw downwardly when it is tightened on the work. In an alternative arrangement, springs urge the bolt heads against the rear faces of T-shaped liners one of which surrounds each bolt head and is bolted in a groove 3 to give each liner a limited vertical but no horizontal movement. Stirrups are placed between the upper faces of the liners and the lower faces of the T-shaped grooves. This subject-matter does not appear in the Specification as accepted.