Abstract:
The present invention relates to an improved vise mechanism wherein the respective jaws of a vise are provided with a sliding movable clamp piece for clamping a workpiece having a plain surface or an irregular surface. The sliding movable clamp piece can automatically adjust its angular and eccentric sliding movement to tightly position the working piece between the jaws of the vise.

Description:
This application is a continuation of Ser. No. 310,113 filed Dec. 15, 1981 now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     The clamp surface of the conventional vise is usually a piece of plate (with ridges of file on the surface) being directly fixed to the jaws. In case of a working piece having irregular planes, the conventional vise can only clamp some points or lines of said working piece; consequently, the clamping is not stable and firm, and the processing work will be rather inconvenient, if not possible. 
     SUMMARY OF THE INVENTION 
     In view of the drawbacks of the conventional vise, this invention hereby provides a vise with sliding movable clamp surface, which can automatically adjust its clamp surfaces to the planes of a working piece until reaching an appropriate angle for firmly and stably clamping the working piece. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an isometric view of the vise in this invention. 
     FIG. 2 shows an embodiment of the sliding movable clamp piece with studs in the vise of this invention. 
     FIG. 3 shows an embodiment of this invention clamping a triangular working piece. 
     FIG. 4 shows an embodiment of this invention clamping a skew quadrilateral working piece. 
     FIG. 5 shows an embodiment of this invention clamping a round working piece. 
     FIG. 6 shows said sliding movable clamp piece in this invention being mounted on a hand tool vise. 
     FIG. 7 show said sliding movable clamp piece in this invention being mounted on the jaws of a lathe chuck. 
     FIG. 8 shows a sectional view of a slantingly coupling surface between said sliding movable clamp piece and said semi-circle-shaped channel in this invention. 
     FIG. 9 shows an embodiment of the sliding clamp base of the vise in the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The main feature of the present invention is the sliding movable clamp pieces(2,2&#39;) being fitted on the corresponding jaws on the vise(1). 
     As shown in FIG. 1, there are two sets of vise members. Each set has a pair of jaw members arranged laterally of one another. Each jaw member carries a sliding movable clamp piece(2) constituting a clamp member. The clamp member is in semi-circle shape with an appropriate arc-shaped thru slot(22) in the body, and with ridges (or cut) of file on the front clamp surface(21); in the center of said front clamp surface, there is a V-shaped cross groove(23). Along each jaw member, a semi-circle-shaped slot or channel(12) is provided for adequately housing each of said sliding movable clamp pieces(2) on a movable basis. On the both jaws, a vertical thru hole(13). thru the top and to the bottom of said semi-circle-shaped channel (12) is provided, and a portion of said thru hole(13) on the top of said semi-circle-shaped channel(12) is formed into a spot-faced hole so as to fit a countersunk bolt(3), constituting a pin which is freely and movably passing thru the arc-shaped thru slot(22) of said sliding movable clamp piece(2) for positioning purpose so as to have said clamp piece(2) moving eccentrically within said semi-circle-shaped channel(12) at an appropriate angle. Moreover, on the corresponding side of the two jaws, if more than two said sliding movable clamp pieces(2) are furnished, a curved notch(11,11&#39;) between each pair of said sliding movable clamp pieces(2) should be provided. 
     As shown in FIG. 2, a stud(24) may be provided on both the top and the bottom of said sliding movable clamp piece(2) so as to be fitted inside an arc-shaped thru slot(15) provided in said semi-circle-shaped channel(12) of the vise(1) for eccentrically moving at an appropriate angle. 
     If a working piece having irregular planes is put between the jaws of a vise mentioned above, said sliding movable clamps pieces(2) will, following the closing motion of the jaws, automatically adjust themselves to the contact planes of the working piece by sliding along said semi-circle-shaped channel(12) as a guide passage until its front clamp surface(21) locating an appropriate angle as the most stable fixing position. 
     As shown in FIG. 3, an embodiment of the present invention is used for clamping a triangle-shaped working piece(7); the front clamp surface(21) of the two sliding movable clamp pieces(2) on one jaw have automatically adjusted to an oblique angle respectively to one side of said working piece; at the same time, the front clamp surface(21) of said two sliding movable clamp pieces(2) on the opposite jaw have also closely contacted with one side of the working piece(7). Now, apply a little bit force to the jaws so as to have them closed to a limit of tightness, and the working piece(7) will be firmly clamped. 
     In FIG. 4, when working piece(8) of skew quadrilateral is clamped with the present invention, each of the two said sliding movable clamp pieces(2) on the jaws is closely and respectively contacted with one side of said working piece(8) thru automatic adjustment of the angle of said front clamp surface(21). The clamping stability of the present invention is definitely much better than that of the conventional vise which can only clamp two sides of a working piece. 
     As shown in FIG. 5, an embodiment of the present invention is clamping a round working piece(9) with the V-shaped cross groove(23) on the front clamp surface(21) of said sliding movable clamp piece(2); since said V-shaped cross groove(23) has a clutch effect to the circumference of said working piece, the clamp stability to the working piece(9) is unique. 
     The total number of said sliding movable clamp piece(2) to be furnished to the jaws of the present invention may be varied in accordance with the actual work requirement. 
     Said sliding movable clamp piece(2) may be furnished to a vise with the same number on both jaws, or with different number on the both jaws, or with some of them on one jaw only; in addition, the total number of said semi-circle-shaped channel(12) and said thru hole(13) for positioning said sliding movable clamp piece(2) may also be determined in accordance with the actual requirement so as to be freely selected by the number of said sliding movable clamp piece(2) to be used. 
     FIG. 9 shows another embodiment of the vise in the present invention. On the back of clamp base(A) at one side (or both) of said vise, a sliding flange(16) that can slide back and forth in the sliding groove(17) to be furnished on the clamp base(B) is furnished; then, when a working piece(8) having unequal sides being processed on said vise, the front surface of the movable clamp piece(2) can closely and completely contact with its sides by appropriately moving the clamp base(A) on one side (or both) of said vise back and forth for position adjustment. Further, on the sliding flange(16) of said clamp base(A), a long groove(16) is provided, and at the back of the clamp base(B), install a lock screw bolt(18) or mechanical catch pin which penetrates thru to said long groove(161) so as to fasten the clamp base(A) from sliding off, and to lock up said clamp base(A) to prevent it from moving, if necessary. 
     The vise described in the present invention should not be limited to the bench vise, or the lathe vise; it should include the sliding movable clamp piece(2) on all hand vises (as shown in FIG. 6), or on the jaws(6) of a lathe chuck(5) (as shown in FIG. 7) for clamping a working piece having irregular surfaces in a more convenient and stable manner than a conventional one. As shown in FIG. 8, the coupling surface between said sliding movable clamp piece(2) and said semi-circle-shaped channel(12) of the present invention may be a slant line for the purpose of yielding an angular lock effect.