US2537254A

US2537254A - Conduit bender

Info

Publication number: US2537254A
Application number: US102379A
Authority: US
Inventors: Blythe Harry
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-06-30
Filing date: 1949-06-30
Publication date: 1951-01-09
Anticipated expiration: 1968-01-09

Description

Jan. 9, 1951 smu 2,537,254

I 35 1' 421.," i I 37--- n I) I I 1 iii INVENTOR.

1 I Z HAP/9V 50 77/15 Ii 32 2 2 fi/ T 1Qfiz- I w ATTORNEY Jan. 9, 1951 H. BLYTHE 2,537,254

CONDUIT BENDER 2 Sheets-Sheet 2 Filed June 30, 1949 INVENTOR. HARE) 5L YTHE Patented Jan. 9, 1951 UNITED- STATES PATENT OFFICE 4 Claims.

This invention relates to a conduit bender, and has for its principal object the provision of a simple and highly efiicient device which can be preset for producing bends of any desired degree in both pipe and thin-walled conduit or tubing of various diameters.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efiiciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a plan view of the improved bender;

Fig. 2 is a side view thereof;

Fig. 3 is an enlarged end view of the bending portion of the bender;

Fig. 4 is a detail, perspective view of a pipe clamp employed in the improved bender;

Fig. 5 is a fragmentary detail section, taken a the line Fig. 11 is a similar section, illustrating the bending sector in the expanded pipe or conduit bending position.

The improved bender is mounted on a supporting frame consisting of two inverted, U- shaped side leg members l3 preferably formed from metal pipe "and joined by means of cross frame members l4 welded or otherwise secured therebetween. The cross members l4 support two longitudinally extending, parallel roller guides l5 between which a pair of flat rollers l6 and a double groove roller l'l extend, for receiving the pipe or tubing to be bent.

A vertical side plate I8 is welded to one of the leg supports l3 and extends upwardly. therefrom.

A channel guide track I9 is secured to each ver-' tical edge of the plate l8 and acts to hold a slide plate 20 in place thereon. The slide plate. is vertically movable and may be adjusted in any desired vertical position by means of a jack screw 2|. The screw 2| is threaded through a foot member 22 mounted on a leg 23 extending downwardly from the side plate 20 and is supported and rotatably mounted in a foot flange formed on the side plate l8 and in one of the cross members l4.

A tubular spindle 24 is fixedly mounted in. the slide plate 20 and extends horizontally outward therefrom to support a bearing collar 25 formed on a bending sector member 26. The vertical position of the slide plate 20 can be determined from an index pointer 21 which indicates positions on a scale 28 on one of the track channels l9.

The bending sector sleeve 25 is provided with a handle socket 29 for receiving a suitable. lever handle 30 which is locked in place in, the socket 29 by means of a set screw 3|. The bending sector is provided with a clamp-supporting arm 32 extending radially downward and sideward from the sector 26. l

A swinging pipe-clamping member 33 is mounted on a hinge pin 34 at the bottom of the arm 32 and is provided at its top with a hook35 which can be hooked over a projecting lug on the upper portion of the arm 32. The clamp 33 is provided with two pipe-engaging notches, a large diameter notch 36 and a small diameter notch 31.

The sector member 26 terminates at its peripheral edge in a groove which forms one-half of a large diameter pipe-receiving groove 38. The other half of the groove 38 is formed by means of a side arc member 39 which is attached to the sector member 26 by means of suitable attachment screws 40 which extend through the sector member 26 and are threaded into the side are member 39. The outer face of the sector 26 is formed with an arcuate curved shoulder 6| which forms one-half of a small diameter pipereceiving groove 4|. The other half of the groove 4| is formed by means of an arcuate side plate 42 which is attached to the sector member 26 by means of suitable attachment screws 43 which extend through the side plate 42 and are threaded into the sector member 26. The tangential axes of the grooves 38 and 4| align with the axes of the

notches

36 and 31 in th clamp 32 and with the grooves in the grooved roller ll.

The screws 40 extend through slotted. screw holes 44 in the sector member 26, and the screws 43 extend through similarly slotted screw holes. 45 in the side plate 42. This allows the side arcl member 39 and the arcuate side plate 42 to be shifted circumferentially. The purpose of this circumferential shift is to vary the width of the grooves 38 and 4|. This is accomplished by forming raised lugs 46 on the sector member 26 which fit into receiving notches 41 on the side are member 39 and the side plate 42. When the lugs 46 are in the notches 4'! the grooves 38 and M are of minimum width. This width can be increased a predetermined amount by loosening the

screws

49 and 43 and slipping the arc member 39 and the side plat 42 circumferentially so that the lugs 46 will rest on th surface of the sector member 26 and not in the notches 41, as shown in Fig. 11.

The sector sleeve 25 is held in place on the spindle 24 by means of a latch pin 43 which is projected outwardly from the spindle by means" of a latch spring 49, and which can be pressed inwardly to remove the sleeve 25 by means of a' its four positions by means of a latch spring 55' which selectively engages any one of four receiving notches 56 in the back of the turret block 53, as shown in Fig. 8. The head of the uppermost stop screw 52 is in the path of, and is contacted by, a lug 5'! formed on and projecting from the handle socket 29. I

The bender can, of course, be designed to handle two difiering sizes of pipe or conduit of any desired diameter. The usual bender is designed. to handle inch and V inch pipe or tubing. A different sector member can be slipped in place on the spindle, however, for handling other sizes.

Operation Let us assume that the inch and inch sec tor is in place and that it is desired to bend inch tubing to a 90 arc. The crank 58 is rotated to position the pointer 23 opposite the 90 bend mark on the index 28. The tubing is inserted over the rollers l6 and Ill to bring the start of the bend below the axis of the sprindle 24. The turret block 53 is rotated to position the proper screw 52 upwardly for a inch tubing bend. The clamp 33 is swung into place beneath the tubing and the handle 30 is pulled rearwardly as far as possible. This brings the lug 51 against the uppermost stop screw 52, producing a perfect 90 bend in the tubing.

Should a 90 bend be desired in inch tubing,

it is placed in the groove of the roller i1 below the small groove 4! and the settings are made at the pointer 2'1 and at the rotating turret head 53 to suit A; inch tubing. The handle 39 is then rotated rearwardly as far as possible. 7, v

For bending pipe it is necessary that the grooves38 and ll be widened, since the outside diameter of pipe exceeds the Outside diameter of tubing. This is done as before described by loos-f ening the

screws

40 and 43 and slipping the arc member 39 and the side plate 42 circumferentially so that they will rest on their lugs 46 to produce a widened groove, as shown at the groove ii in Fig. 9. ,Thesettings at 2'! and 53 are then properly made to accommodate pipe bends.

A scale is furnished with each machine, telling 4 the operator the proper settings of the turret head 53 and the pointer 21 for any desired pipe or tubing. A second pointer 59 is mounted over an index 60 on the sleeve 25 to give the desired degrees for bends less than While a specific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

1. In a pipe bender having a rotary sector member provided with an arcuate pipe-receiving groove for forming a bend in a pipe, means for varying the width of the groove in said sector member to adapt said groove to either pipe or tubing, comprising: a half groove formed in said sector member; an arcuate side plate, the other half groove being formed in said side plate;

screws attaching said side plate to said sector member; projections on said sector member; and complementary receiving depressions in said side plate fOr receiving said projections, said screws being positioned in slotted screw holes so that said side plate ma be shifted circumferentially to place said projections either in or out of said depressions.

2. A pipe bending sector for pipe bending devices comprising: bending sector having an arcuate edge; a transversally curvated groove in said edge forming one-half of a, groove; a side are member corresponding in radius to said sector and having similarly curvated arcuate edge forming the other half of a 180 groove, said side arc member being circumferentially shiftable relative to said sector; and means acting to separate said arc member from said sector in consequence of the relative circumferential movement th'ereb'etween.

3. A pipe bending sector for pipe bending devices comprising: a bending sector having an arcuate edge; a transversally curvated groove in said edge forming one-half of a 180 groove; a

' side arc member corresponding in radius to said sector' and having a'similarly curvated arcuate tacting surfaces between said arc member and said'sector being such that the two will be spaced further apart at one circumferential position than another.

'4. A pipe bending sector for pipe bending devices comprising: a bending sector having an arcuate edge; a 'transversally curvated groove in said edge forming one-half of a 180 groove; a'

side are member corresponding in radius to said sector and having a similarly curvated arcuate edge forming the other half of a 180 groove, said side arc member being circumferentially shiftable relative to's aid sector; means acting to separate said am member from said sector in consequence of the relative circumferential move.

ment therebetween; an arcuate shoulder of less radius than said sector projecting concentrically from one face thereof, a transversally arcuate groove insaid shoulder formingone-half of a second 180? grooveyan arcuate side plate having; the ,remainder of' said latter. groove secured against said sector below said shoulder; and

means for varying the spacing between said sector and said arcuate side plate.

HARRY BLYTHE.

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

UNITED STATES PATENTS Number Number Number 10 Name Date Schalk Feb. 9, 1932 Redmer Jan. 21, 1941 Shaw Dec. 23, 1941 St. Clair May 23, 1944 Duer Sept. 12, 1944 Jimerson June 28, 1949 FOREIGN PATENTS Country Date Great Britain Apr. 13, 1908 OTHER REFERENCES P. 121, American Machinist, Mar. 29, 1945.