US2454867A - Bus bar bender - Google Patents

Description

N0V 30, 948 y J. wfGARRr-:TT 2,454,867

Bus BAR BENDER y Filed Nov. 29, 194e 3 Sheets-sheet 2 1 2f Z' Y NOV. 30, 1,948. .5 J W, GARRETT. I

vBUS BAR BENDER Filed Nov. 29., 1946 3 Sheets-Sheet 3 n il 'I JNVENTOR.

Patented Nov. 30, 1948 UNE'EED STA'ES .P'ENT FFQE 6 Glaims. 1 My invention relates to tools and more particularly to bar bending tools.

The object of my invention is to provide a bar bending tool adapted to receive and hold a bar and to facilitate the bending of said bar at a per-- feet ninety degree angle.

Another object of my invention is to provide a bar bending machine of the character indicated above adapted to be positioned, so that a bar arranged in said bending machine can be bent downwardly or sidewardly at a perfect ninety degree angle.

Other objects of my invention may appear in the following specification describing my invention with reference to the accompanying drawings illustrating a preferred embodiment of my invention.

It is, however, to be understood that my invention is not to be limited and restricted to the exact construction and combination of parts dem scribed in the specification and shown in the drawings, but that such changes and modifications can be made, which fall within the scope of the claims.

In the drawings:

Figure l is an elevational side View of a bar bending machine according to my invention.

Figure 2 is a top plan view of Figure 1 showing the supporting channel and bus bar in horizontal position.

Figure 3 is a sectional view taken on line 3-3 in Figure 2.

Figure 4 is a fragmentary sectional view taken on line -d in Figure l, and

Figure 5 is a vertical sectional view through the bending lock-bars.

Figure 6 is a top plan view of Figure l showing the supporting channel and bus bar in vertical position.

Figure 7 is a sectional view taken on the line '1 -1 of Figure 6.

Referring now in detail to the drawings, the bar bending machine forming the subject matter of my invention comprises a base Hl preferably made from an eight inch channel H. On the outside of each iiange of this channel il a clip angle l2 is secured adjacent each end thereof for instance by welding one leg of the clip angle onto the channel flange, so that the outside surn faces of the other angle leg and the channel web are located in the same plane. The base it is arranged on a bench or work table I3 and is fastened thereon by means of bolts Hl extending through the outwardly extending legs of the clip angles l2 yand the work table I3 and secured in position by washers l5 and nut I6 thereon.

Two annular base plates ll are provided in their circumferences with two angular notches I8 adapted to receive the edges of the flanges of the base channel Il therein. The annular base plates l1 are arranged adjacent the ends of the base channel ll and are welded thereon.

One the left hand surface of each base plate l1 two threaded studs lil are secured and arranged diametrically opposite to each other at equal distances from the center of the annular base plates il.

An annular positioning plate or rotary annulus 20 is adjustabiy mounted on each base plate ll in the following manner: Two slots 2l are provided in each positioning plate 2B. Each slot 2l is shaped like a quarter of a circle and is of such size and arranged, so that the two studs I9 on each of the base plates Il are adapted to extend through the slots 2l in one of the posi tioning plates 25. This arrangement permits each positioning plate 2G to be rotated on the correspending base plate El to the extent of ninety degrees. A nut 22 on each stud i9 is adapted to secure the positioning plates 2o in adjusted position.

In the bores 23 of the positioning plates 2li a supporting channel 2d is secured by welding and is arranged therein, so that its web extends horizontally or vertically, when the positioning plates 20 are rotated relative to the base plates Il, so that the studs I are located at either end of the quarter-circular slots, and the flanges thereof eX- tend either downwardly or toward the right, when the bending machine is assembled. Preferably, the supporting channel is a six inch channel.

Two guide bars 25 are arranged on top of the supporting channel 2li and extend alongside the edges thereof between the left hand base plate ll and the right hand positioning plate 2t.

Each guide bar 25 has on each end of its outer edge a fastening lug 2S extending at right angles to the corresponding bar 25 .and parallel to the adjacent iiange of the supporting channel 2t. In each fastening lug 2li a tapped hole 2l is provided and in the adjacent support channel flange a plain hole 23 is arranged coaxially with the tapped hole 27.

A bolt 29 has a reduced end it rotatably extending through the hole 2B in the supporting channel flange and on this reduced end a round head 3l is formed permitting rotary movement of the bolt 29 but preventing axial movement thereof relative to the supporting channel 24.

The bolts 29 threadedly engage the threaded holes 21 in adjusting lugs 26 on the guide bars 25, so that the guide bars can be adjusted to engage the edges of a bus bar 32 laid on the channel 24, so as to position the bus bar correctly for a bending operation.

When a bus bar 32 is to be bent, the machine is arranged, so that the supporting channel flange is positioned horizontally by loosening the nuts 22 on the studs IS and adjustingthe positioning plates 20 on the base plates I1 and then fastening the nuts 22 again.

The bus bar 32 is marked at the place where it is to be bent, and a set of clamp bars is secured on the bus bar, so that the outer edges of the cla p bars are located on the marked place.

ne set of clamp bars consists of a rectangular to bar 33 having a substantially squarecross sec-A tion and a bottom bar 34 having a triangular cross section of right angled isosceles shape. These two clamp bars are secured onto thebus bar 32 by means of bolts 35 extending through the top bar 33 and being screwed into the bottom bar 34.

AY second set of clamp bars consists of a'top clamp bar 36 shaped like the rst mentioned top clar'np bar 33 but being equipped centrally on its top surface with a handle bar 3'! and abottom clamp bar 38sh`aped like the rst named bottom clamp bar 34. The second set of clamp bars is adjustably assembledk by means of bolts 33 ex tending through holes 4D in the top bar 36 and threadedly engaging tapped holes 4I in the bottom bar 38.

The two sets of clamp bars are arranged on the bus bar so that the hypotenuses of the two triangular bottom bars 34 and 38 form a right angle with each other, the apex whereof is located on the mark on the bus bar 32 and the bus bar 32 is located onthe support channel Mbetween 1;

the guides 25. By pulling the handlebar 37 downwardly until the two bottom bars 34 and 38 abut each other the bus bar 32 is bent at a perfect ninety degree angle. In case the portionof the bus bar which extends beyond the second set is so long, that it contacts the work table I3 or the door before the bus bar is bent at ninety` degrees, the nuts 22 on the ystuds i9 are loosened and the adjusting plates 2n are rotated on the baseplates H until the supportchannel 2 4 is arranged vertically. Then the nuts 22 are tightened again. The Ahandle bar 31 then occupies a horizontal instead of a vertical position, and is swung in a horizontal plane to bend the bus bar 32. n

Having described my invention I claim as new 4nd desire to secure by Letters Patenti 1. A bus bar bending machine comprising an longated base arranged to be secured to a supporting surface, a pair of` plates secured to extend at right angles from s aidbase at longituqinauy spaced points, said pates being provided with aligned circular openings, rotary annuli mounted on saidplates with their openings aligned with the circular plate openings, means for limting rotation of said annuli to predetermined Varcs and f or locking said annuli in selected positions of rotation relative to said plates, an elongated bus bar support extending through the openings of Vsaid annuli and Xed to said annuli, guide bars extending along opposite sides of said sup- 4 port, means aiording lateral adjustment of said guide bars to engage the opposite side edges of a bus bar positioned lengthwise on said support for positioning said bus bar relative to the sides of said support with one end of the bus bar projecting longitudinally beyond the adjacent end of said support, bending means arranged to be secured to the bus bar comprising a rsfl pair of bending bars secured atl opposite sides of said end of the bus bar with one of said bending bars engaged with the adjacent end of the support, and a second pair of bending bars to be secured at opposite sides of the bus bar outwardly of said rstpair of bending bars, and a handle on one of said second pair of bending bars for swinging said second pair of bending bars relative to said rst pair of bending bars so as to bend the bus bar at a point between said pairs of bending bars.

2. The bus bar bending machine according to claim 1 wherein the m'eans for limiting the rotation of s aid annuli comprisesstuds projecting from said plates througharcuate slotsfornedin said annuli, and nuts on said studsfor lgcliing said annuliV in a selected position of rotation relative tosaid plates;

3. The bus bar bending machine ac cordingto claim l wherein the means for limitingthe rotation of said annuli comprisesstuds projecting from said plates through arcuate slets forrned in said annuli, and n uts on said studsfor locking said annuli in a selected position of rotation relative to said plates, and wherein the means affording lateral adjustment of said guide barscomprises screws ysecured to the sides of s aidbusbar support for rotation on their axes, sai d ,scr ews being threaded in portions of saidguide vbars whereby rotation of the screws in one direction withdraws said guide bars laterally doutwardly and rotation of said screws in the opposite direction moves said guide bars laterally inwardly with respect to the sidesof said support.

4. The bus bar bending machine according to c lairn 1 wherein the said bending bars are elongated transversely with respect tothe length of the bus bar and have bolts traveising the ends of each pair of saidbars at pointslaterlly outward of the side edges of the bus bar and securing the bending bars at opposite sides of the bus bar.

5. The bus bar bending machine accordingto claim 1 wherein the annuli are positioned on the same sides of the related plates.

6. The bus bar bending machine according to claim 1 wherein the annuli are positioned on the sides of said plates remote from said bending means.

JOSEPH W. GARRTT.

REFERENCS CITED The following references are of record in the le of this patent: l

UNITED STATES PATENTS Name Date' Raymond Dec. 4,- 1894 Spencer July 16, 1918 Farney July 18, 1939 FOREG PATN's Country Date Germany July 12, 1886 lumber Number

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