US2851913A - Pipe vise having holding pawl for jaw-advancing screw - Google Patents

Description

Sept. 16, 1958 L. v. RAMONEDA PIPE VISE HAVING HOLDING PAWL FOR JAW-ADVANCING SCREW Filed Feb. 17, 1956' United States Patent O PIPE VISE HAVING HOLDING PAWL FOR JAW-ADVANCING SCREW Louis V. Ramoneda, New Orleans, La.

Application February 17, 1956, Serial No. 566,274

1 Claim. (Cl. 81-49) The present invention relates to new and useful improvements .in pipe vises and has for its primary object to provide, in a manner as hereinafter set forth, a device of this character comprising novel means for automatically and positively locking the slidable jaw in clamping engagement with the work, thus preventing slipping of and consequent damage to said work.

Other objects of the invention are to provide a vise of the afore-mentioned character which will be comparatively simple in construction, strong, durable, compact, of light weight and which may be manufactured at low cost.

These, together with other objects and advantages which will become subsequently apparent, reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a view in front elevation of a pipe vise constructed in accordance with the present invention;

Figure 2 is a view in side elevation of the device, showing a portion broken away in section; and

Figure 3 is a view in horizontal section through the screw, taken substantially on the line 33 of Figure 1.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a base of suitable metal which is designated generally by the reference character 1. The base 1, which may also be of any desired dimensions, has mounted thereon a toothed, fixed or stationary jaw 2 adapted to receive the work thereon.

Mounted for swinging movement in a vertical plane on the base 1 is a substantially U-shaped frame or yoke 3. One end of the frame 3 is pivotally connected to the base 1, as indicated at 4. A suitable latch 5 releasably secures the other or free end of the frame 3 to the base 1.

Slidably mounted between the legs 6 of the frame 3 is a jaw 7 which is cooperable with the stationary jaw 2. A screw 8 is threadedly mounted in the bight portion 9 of the frame 3. The screw 8, which includes a square thread 10, has its lower end portion swivelly connected, as at 11, to the slidable jaw 7 for actuating same. The screw 8 further includes a longitudinal keyway 12, the purpose of which will be presently set forth. A suitable operating handle 13 is provided on the upper end portion of the screw 8.

Encircling the screw 8 and resting on the bight portion 9 of the frame 3 is a ratchet wheel 14. The ratchet wheel 14 includes an internal key 15 (see Figure 3) which is engaged in the way 12 for connecting said ratchet wheel to said screw for rotation therewith. However, a retaining finger 16 on the frame 3 secures the ratchet wheel 14 against longitudinal movement with the "ice screw 8. Pivotally mounted on the bight portion 9 of the frame 3 and engaged with the ratchet wheel 14 is a spring pressed pawl 17 which positively locks the screw 8 against retrograde rotation. The pawl 17 includes a thumb piece 18 on one end for disengaging said pawl from the ratchet wheel 14.

It is thought that the use of the device will be readily apparent from a consideration of the foregoing. Briefly, the work is inserted between the jaws 2 and 7 in an obvious manner. The screw 8 is ,then turned downwardly in the frame 3 for tightening the slidable jaw 7 on the work. As the screw 8 is thus turned clockwise, the pawl 17 rides over the teeth of the ratchet wheel 14. However, after the work has been clamped between the jaws 2 and 7, the pawl 17, through the medium of the ratchet wheel 14, positively prevents turning of the screw 8 in the opposite direction. Thus, loosening of the slidable jaw 7 is prevented. Of course, when it is desired to elevate the jaw 7 for releasing the work, the pawl 17 is disengaged from the ratchet wheel 14 through the medium of the thumb piece 18 for permitting the screw 8 to be turned upwardly or counterclockwise in the frame 3. The latch 5 may then be disengaged from the base 1 for permitting the frame 3 to be swung to open position on the pivot 4 for removing the work. Cotter pins 19 prevent loosening of the several nuts 20 of the device.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described,- and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

A pipe vise of the character described comprising: a base, a stationary jaw mounted on said base, a substantially U-shaped frame having one end pivotally secured to the base, means releasably connecting the other end of said frame to said base, a slidable jaw operable between the legs of the frame and cooperable with the stationary jaw for receiving and clamping a pipe therebetween, a screw threadedly mounted in the bight portion of the frame and having one end swivelly connected to the slidable jaw for actuating same, said screw having a longitudinal way therein, an operating handle on the other end portion of said screw, a ratchet wheel encircling the screw and rotatably mounted on the bight portion of the frame, said ratchet wheel including an integral key engaged in the way for connecting said ratchet wheel to said screw for rotation therewith, an angulated finger 0n the bight portion of the frame engaged with the ratchet wheel for rota'tably retaining same on said frame against longitudinal movement with the screw, and a spring-pressed pawl pivotally mounted on the bight portion of the frame and engaged with the ratchet wheel for releasably securing the screw against rotation in one direction.

References Cited in the file of this patent UNITED STATES PATENTS 192,719 Tarr July 3, 1877 297,130 Holcomb et al. Apr. 22, 1884 677,212 Heilman June 25, 1901 1,057,311 White Mar. 25, 1913 1,761,366 Reutter June 3, 1930 2,318,566 Wright May 4, 1943

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