US660367A - Pipe-vise. - Google Patents

Description

Patented Oct. 23' I900.

No. 660,367. T. DAVIS...

PIPE VISE.

(Appliution filed Feb. 27, 1900.)

(No Model.)

WITNESSES: INVENTOR: '14 Beams,

NIIED I STATES PATENT OFFICE.

THOMAS DAVIS, OF ORANGE, NEW JERSEY.

. PlPE -VISE.

SPECIFICATION formingpartof Letters Patent No. 660,367, dated October 23, 1900.

Application filed February 27, 1900. Serial No- 6.671. (No model.)

To all whom it may concern.-

Be it known thatI, THOMAS DAVIS, a citizen of the United States, residing at Orange, in

the county of Essex and State of New Jersey,

have invented certain new'and useful Improvements in Pipe-Vises; and I do hereby declare the following to be a full, clear, and

exact description of the inven tion,such as will I enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and

invention being to enable the vise to effec-f tually grip pipes or rods of a greater range of variation of diameters, to secure a greater strength to resist the pressure on the bitingblades, and to secure other advantages and results, some of which may be referred to hereinafter in connection with the description.

of the working parts.

The invention consists in the improved pipe-vise and in the arrangements and combinations of parts of the same, all substantially as will be hereinafter set forth and finally embraced in the clauses of the claim.

Referring to the accompanying drawings, in which like letters of reference indicate corresponding parts in each of the several Views, Figure 1 is a side elevation of the improved pipevise. Fig. 2 is a plan of the biting-blade, and Figs. 3, 4E, and 5 are side and end views of the same.

In said drawings, a indicates the frame of the vise, having a detachable yoke a at the top and inclined bearings a a toward the bottom.

I) b are the biting-blades, converging to ward their lower or biting ends and lying upon and parallel with the inclined bearings a of the frame.

c is a cross-head movable vertically on suitable guides or ways a of the frame and adapted to operate the blades 1), said blades being suspended from the cross-head and adapted to slide thereon toward or apart from each other to maintain their parallel relation with the inclined bearings, and d is a clampingsame as the screw is turned in one direction or the other.

The features of construction thus described may in detail be of the construction shown and described in said prior patent, excepting the construction of the inclined bitingblades 1).

In the prior construction the biting-blades were effective in holding the pipe firmly against any tendency to turn when forming threads upon the pipe or otherwise working thereon only when said pipes were of sizes between'certain very narrow limits of variation. When the pipe operated on exceeded in diameter the said limits, then the vise failed to properly grip and hold said pipe against the strain due to the thread-cutting tool, and consequently the value and adaptability of the vise for general shop purposes was greatly reduced.

By myimprovements the vise is largely increased in its scope of operations and brought within the limits of practicability. To this end the blades 1) b are each provided with stepped biting ends, of which b b are the first step-bearings, adapted to grip pipes of small diameter, and b b are the second steps for engaging pipes of larger diameter. The steps are form ed by recessing, as at 12 one side portion of the end of the blade, thus forming the second edge 11 farther back on the blade.

As will be understood from an inspection of Fig. 1 of the drawings, the first step or end bearing 19 engages pipes which are of small diameter in comparison with the capacity of the vise, the second step-bearing b remaining unengaged, as shown. In the case of a large pipe the second step or recessed bearing edge b acts while the first remains idle. Evidently there will be an,intermediate size of such a diameter that both bearing edges will engage the surface of the pipe equally, and thus I may make a pipe-vise adapted particularly for certain specific sizes of pipe in which the pipe is engaged at two points on its periphery by each biting-blade. This secures a diffusion of the strain and an enlarged contact with the pipe.

The biting-blades b are subjected under the pressure of the screw and cross-head to great strain, and should the inclined bearings of the frame be at all irregular or should extraneous matter be inserted between the blade and bearing, lifting said blade slightly from the inclined surface, there is a tendency to break the first step-bearing b by rupturing the hard and brittle steel. would this be true if the recess 5 back from the extreme biting edges, were formed right angular in cross-section. the first or extreme biting-bearing b, so that it resists the pressure by forming the recess 1) with curved walls, so that said extreme step b gradually thickens as it approaches the second bearing. This construction secures a maximum strength and avoids frequent breakage.

Having thus described the invention, what I claim as new is- 1. In a pipe-vise, the combination with the frame having oppositely-inclined bearings, of a pair of biting-blades arranged to slide on "said bearings and maintain a parallel relation thereto, each blade having at its lower end two or more biting edges, and means for raising and lowering said blades, substantially as set forth.

2. In a pipe-Vise, the combination with a Especially I therefore brace treme step increasing in thickness toward the body of the blade, substantially as set forth.

4. As an article of manufacture, the improved biting-blade for pipe-Vises having at one side edge of its end a longitudinal recess b having curved walls in cross-section and opening at both the side and end of the blade, said recess forming an extreme biting edge b, whose walls thicken toward its base, and

(a second biting edge b substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of February, 1900.

THOMAS DAVIS.

Witnesses:

CHARLES H. PELL, O. B. PITNEY.

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