US1757806A - Pipe-bending machine - Google Patents

Description

May 6, 1930. H. LIBERTY PIPE BENDING MACHINE Filed April 16. 1928 ME Ima any Patented May 6, 1934) UNITED STATS OFFICE HARRY L. LIBERTY, OF CHICAGO, ILLINOIS PIPE-BENDING MACHINE Application filed April 16,

-::= abutment by means of a pivoted roller carrying lever is adapted to be readily removed from the machine when the lever is swung back into normal position and the clamping vise is released. 1

It is a further object of this invention to provide a bending machine adapted for use in bending pipes or conduits and having a grooved cam and a pivotally supported grooved roller for coaction therewith, with said cam and roller both having a segment of one of the groove flanges thereof cut away to aii ord a ready passageway for the insertion of a pipe between said cam and roller when the segment edges thereof are positioned adjacent one another in parallel relation.

It is an important object of this invention to provide a pipe bending machine having a pipe gripping vise on which a grooved cam or abutment is ri idly secured, with said cam having pivotally mounted thereon a pipe bending lever carrying a grooved roller adapted to act on a projecting end ofa pipe held in said vise to bend the pipe around the grooved cam.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

1928. Serial No. 270,217.

Figure 3 is a side elevation of the machine l with the ends of the pipe broken away.

Figure 1 is a. detail section taken on IV-IV of Figure 1 with parts omitted.

' Figure 5 is a diametric section of the bending roller.

As shown on the drawings:

The improved pipe or conduit bending machine comprises a base plate 1 having suitable line apertures therein to permit the same to be rigidly secured to a bench or other support. Rigidly mounted on the base plate 1 is an arched frame or yoke 2 forming part of a vise. Adjustably threaded through the upper central portion of the yoke 2 is a screw 3 provided w ith a passaged head 1- through which a vise handle 5 is slidably engaged. Engaged on the lower end of the vise screw 3 is a plunger or plate 6 with the ends thereof suitably grooved to slidably engage on the upright ides of the yoke 2. Secured to the bottom of the plunger 6 is an upper clamping member 7 provided with a transverse pipe receiving notch at 8. Ptigidly secured to the mounting plate l is a lower clampin provided with a transverse pipe receiving notch positioned opposite the notch 8 in the upper clamping member 7.

Rigidly bolted or otherwise secured to one end of the base 1 and to the side of one leg of I the yoke 2 is a flange 10 which is integrally formed at right angles on the bottom of an arcuate abutment or cam 11. The cam 11 is provided with a curved edge which is grooved at 12. A. segment of the upper flange forming the cam groove 12 is cut away or mutilated from a point adjacent the clamping vise in a line at right angles to the base of said vise to afford an open'groove along a segment line 13 to permit an easy entrance guide for a pipe or tube 14 which. is to be bent. Pivotally mounted on a pivotbolt or pin 15 supported on the cam 11 is a lever 16 having a U-shaped bracket 17 integrally formed thereon and carrying a pivot pin or stud 18 on which is rotatably engaged a peripherally grooved bending roller 19. A segment or are of the upper flange of the grooved roller 19 is cut away or mutilated to form a segment edge or line 20 normally adapted to be positioned at substan- 9; member 9 also 3' tially right angles to the front face of the yoke 2 and opposite and parallel to the segment edge 13 of the cam member 11. Vith the vise in released or open position and with the lever 16 positioned substantially parallel to the front face of the vise yoke, the roller 19 is rotated until the segment edge 20 is opposite and parallel to the segment edge 13 of the cam 11 to permit a pipe 14 to be projected through the vise and through the guide opening afforded between the open segments 13 and 20 of the cam and roller, respectively. The vise is then adapted to be closed by means of the handle 5, thereby causing the pipe to be tightly gripped or clamped between the gripping blocks 7 and 9 of the vise.

lVith the machine having the parts posi' tioned as indicated in Figure 1, with the pipe projecting through the entrance guide groove afforded between the cam and the roller, the lever 16 is adapted to be swung from its normal position substantially parallel to the base of the vise yoke toward the dotted line position illustrated in Figure 1, thereby causing the roller 19 to rotate on the projecting end of the pipe to bend the pipe around against the curved grooved surface 12 of the cam or arcuate abutment 11. It will thus be noted that the projecting end of the pipe will be bent into the form of a curved elbow 21. After the pipe has been bent into the desired form the lever 16 is swung backwardly from the dotted line position in Figure 1 into its normal full line position after which the vise is released to permit the bent pipe to be pulled out of the vise through the guide groove afforded between the yoke and roller.

The device is of simple form and is adapted to be conveniently operated to act on pipes, conduits, tubes, or the like to quickly and easily bend a portion of a pipe around the curved grooved edge of the stationary cam or abutment. The nature of the curve, of course, will depend upon the curvature of the grooved cam edge of the abutment 11.

I am aware that many changes may be mace, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. A bending machine comprising a vise adapted to clamp an article which is to be bent, a grooved cam rigidly secured to said vise and having a segment of one of the groove flanges thereof cut away to form an open guide segment in the cam, a lever pivotally mounted on said cam, and a grooved roller rotatably mounted on said lever, said roiier having a segment of one of the groove flanges thereof cutaway to form an open guide segment and adapted to be positioned opposite the open guide segment of the cam to afiord an open guide passage for the article which is to be bent.

2. A pipe bending machine comprising a clamping vise adapted to rigidly hold a pipe to be bent, a grooved cam rigidly secured thereto with a segment of one flange of the grooved cam cut away, a lever pivoted on said cam, and a grooved roller rotatably engaged on said lever and having a segment of one of the groove flanges cut away and normally adapted to be positioned opposite and parallel to the segment of said cam to afford an open groove for receiving the pipe prior to a bending operation of the pivoted lever.

A pipe bending machine comprising means for clamping a pipe to be bent, a stationary multilated grooved cam member adj acent said means, a lever pivoted on said cam member, and a mutilated grooved roller on said lever adapted to coact with said cam to bend the pipe around said cam when the lever is operated.

4. A bending machine comprising means for clamping a pipe to be bent, an abutment rigidly secured to said means having a curved grooved edge with a segment of said grooved edge cut away, a lever pivoted on said abutment, and a grooved roller on said lever having a segment thereof cut away and normally positioned opposite the segment line of said abutment to afford an entrance guideway for the pipe clamped by said means.

5. In a pipe bending machine the combina tion with a stationary grooved cam liav 1g a segment of the grooved portion thereof cut away, of a grooved roller having a segment of the grooved periphery thereof cut away, and means for causing said roller to coact with the grooved cam on an article positioned between said cam and roller to bend the article around the grooved edge of said cam.

6. In a pipe bending machine the combination with a grooved cam, of a grooved roller in the plane of said cam and spaced therefrom, said grooved cam and roller each having a segment of the grooved edge thereof cut away to afford a receiving guide passage for an article to be bent, and a lever sup porting said roller and pivotally engaged on said cam adapted to be operated to cause the roller to bend the article around the grooved edge of said cam.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois.

HARRY L. LIBERTY.

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