US2570857A

US2570857A - Vise having swivel jaw clamped to base in proportion to clamping pressure on workpiece

Info

Publication number: US2570857A
Application number: US125501A
Authority: US
Inventors: Purpura Liborio
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-11-04
Filing date: 1949-11-04
Publication date: 1951-10-09
Anticipated expiration: 1968-10-09

Description

Oct. 9, 1951 L. PURPURA 2,570,857 VISE HAVING SWIVEL JAW CLAMPED TO BASE IN PROPORTION TO CLAMPING PRESSURE ON WORKPIECE Filed Nov. 4, 1949 2 Sheets-Sheet 1 l2 fiorz'o .Pur ura ATTORNEYQ V INVENTOR 2,570,857 OPORTION Oct. 9, 1951 L. PURPURA VISE HAVING SWIVEL JAW CLAMPED TO BASE IN PR TO CLAMPING PRESSURE ON WORKPIECE 2 Sheets-Sheet 2 Filed Nov. 4, 1949 INVENTOR I ATIORNEKS g1 Li$orio Purpura Patented Oct. 9, 1951 UNITED'STATES PATENT OFFICE.

VISE HAVING SWIVEL JAW CLAMPED TO BASE IN PROPORTION TO CLAMPING PRESSURE ON WORKPIECE V Liborio Purpura, Wheeling, W. Va. Application November 4, 1949, Serial No. 125,501

1 Claim. 1

This invention relates to swivel vise having means to vary the clampin of the swivel jaw to the base in proportion to the pressure exerted on the work.

A primary object of this invention is to provide a swivel vise which is so constructed and arranged that the swivel jaw will be tightly clamped to the bed or base in proportion to the pressure exerted on the work piece.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claim.

In the drawings,

Figure 1 is a plan view partly broken away and in section, of a swivel vise constructed according to an embodiment of this invention,

Figure'2 is a bottom plan view of the vise,

Figure 3 is a longitudinal section taken through the vise,

Figure 4 is an outer end elevation of the vise,

Figure 5 is a perspective view of the swivel jaw,

Figure 6 is a fragmentary sectional view taken on the line 6-6 of Figure 2,

Figure '7 is a fragmentary sectional view taken on the line 1-1 of Figure 1.

Referring to the drawings, the numeral l0 designates generally a bed or base of substantially rectangular configuration in plan, which has projecting from the opposite longitudinal edges thereof pairs of ears formed with elongated openings l3 through which fastening means are adapted to be extended for securing the base ID to a supporting element. I

The base H) has formed at the outer or forward end thereof an upstanding fixed clamping jaw I2 and a plate I4 is fixed to the inner or rear side of the jaw 2 by fastening means IS. The base I6 is provided with a longitudinally extending opening l6 equally spaced between the longitudinal edges of the base and a slide member generally designated as I! is disposed partly within the opening l6 and within a pair of longitudinally extending parallel guide grooves l8 which are formed in the lower side of the base Ill.

The slide member I! includes a nut portion 26 having a threaded bore through which a slide adjusting screw shaft 2| engages. The shaft 2| loosely engages through an opening 22 formed in the forward end of the base l0, and the forward end of the shaft 2| is provided with an annular head 23 which engages in a recess 24 formed in the forward end of the base Ill.

2 A plate or cap 25 normally closes the opening 24. The head 23 provides for holding the shaft 2| against rearward movement when the slide member I1 is under pressure from the movable jaw, as will be hereinafter described;

The rear or inner end of the shaft 2| loosely engages through an opening 26 provided in the rear portion of the base 16, and a cylindrical collar 21 is secured by fastening means 28 tothe shaft 2| and bears against the rear end of the base In. The shaft 2| is provided at its rear end with a polygonal head or member 29 which may be engaged by a wrench, handle or other means for effecting rotation of the shaft 2|.

The nut portion 20 has projecting upwardly therefrom a threaded stud 30 on which a conical nut 3| is threaded. The conical nut 3| is adapted to be locked in its adjusted position on the stud 30 by means of one or more set screws 32 which are threaded through the nut 3| and are adapted to bear against the upper side of the nut portion 20. r

A swivel or rotary jaw generally designated as 33 is rotatably mounted on the nut 3| and is formed with a conic-a1 opening 34 extending downwardly therethrough, within which the nut member 3| is adapted to engage. The jaw 33 is substantially square in plan and has secured to the outer faces thereof

plates

35, 36, 31 and 38. The face plate 35 is preferably smooth on its outer side, which side is adapted to confront the' plate l4, whereas the plate 36 is formed with a knurled or serrated outer side 39. The plate 31 is formed with a longitudinally extending groove 40, whereas the plate 38 is formed with at least a pair of vertically disposed grooves 4|.

The slide member I! also includes a forward pair of elongated slide bars 42 engageable in the guide grooves l8, and also includes a pair of relatively short slide bars 43 projecting from the opposite or rear end. These

bars

42 and 43 provide a means whereby the nut member |9 will beheld against tilting and also provide a means for frictionally gripping the downwardly facing surfaces of the guide grooves H3 at the time the work piece is clamped between the jaws I2 and 33.

A disc-shaped plate 44 is secured in the upper end of the jaw 33 by countersunk fastening members 45.

In the use and operation of this Vise, the base H) is secured by suitable fastening means passing through the openings l3 and into the bed of a machine or other supportingelement. The Work piece is disposed on the upper side of the base 0 between the jaw l2 and 33. When the screw shaft 2| is rotated t move the jaw 33 toward the jaw l2, the work piece will be tightly clamped between the two jaws. In the event the work piece is formed with non-parallel opposite sides, the jaw 33 will swing on the conical nut 3|. As pressure is applied to the work piece, the swivel jaw 33 will be forced downwardly on the nut 3! to frictionally bind against the upper side of the base In, and at the same time an upward pressure will be exerted on the nut 3| which will be communicated through the nut portion 20 to the

slide bars

42 and 43. These slide bars will frictionally bind against the under surfaces of the grooves I8. H V

I do not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claim.

What I claim is:

A swivel jaw vise comprising a base formed with an elongated opening therethrough, a fixed jaw carried by said base adjacent one end of said opening, a movable .jaw engaging the upper side of the base, said movable jaw having an inverted conical passageway extending therethrough from top t6 bottom, said base having "gfiide'grooves in the lower side thereof, said guide grooves extending parallel to said opening, a slide engaging said guide grooves, said slide having "a threaded opening, a screw shaft rotatably carried by said base and engaging through said threaded opening; a threaded stud fixed to and extending upwardly from said slide, passing through said elongated opening, and terminating in said passageway; an inverted conical nut threaded on said stud and positioned in said passageway so that the conical surface of the latter engages only the conical surfaceof the nut whereby clamping pressure against said movable jaw effects a binding thereof against the upper side of said base and simultaneously efi'ects bindingv of said slide in said grooves, and said movable jaw comprising a rectangular body rotatable on said stud.

LIBORIO PURPURA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name 7 Date 1,751,329 Hancock Mar. l8, 1930 2,318,487 Horn, Jr. May 4, 1943 FOREIGN PATENTS Number Country Date 171,435 Great Britain Nov. 14, 1921 177,843 Great Britain Apr. 3, 1922