Patent GB-275780-A (GB)
Title: Improvements in or relating to metal-bending machines
IPC: B21D11/06
Filed: 1926-07-26
Abstract: 275,780. Wheeler, J. S. July 26, 1926. Angular bending; bending-formers, coiling.-In a machine for bending or coiling rods, bars, pipes &c., a rotatable former is mounted at the upper end of a vertical shaft and cooperates with a work-holder connected to the shaft so as, to be rotatable with the former, and with a stationary pressure device bearing on the work in a radial direction at the point of contact of the work with the former. A former 41, Fig. 3, having a flat 44 to facilitate removal of the work is secured by a screw 46 on a vertical shaft 5 provided with flats 45, so as to facilitate placing of the former thereon according to the direction of rotation of the shaft. The shaft carries a table 6, Fig. 2, resting on an antifriction bearing 8 on a bench 3 supported by posts 2 from a bed 1, and carries a friction wheel 9 supported by a collar 10 and engaged by either of a pair of pulleys 23, 24, which are driven from pulleys 20, 21 on shafts connected by a cross belt 15, one of the pulley shafts being driven by worm gearing 18, 17 from the shaft 19. The pulleys 23. 24 are. movably mounted in frames 22 and may be put into engagement by pitmen 25, liners 26. and a connecting rod 27 through a handle. A stop arm 30 angularly adjustable on and secured to the table engages a spring stop 29 to determine the amount of the bend, the stop being pushed back by the arm and then coming forward to engage a lever 26 to stop the drive. The work clamps 35, 36 are mounted on a bar 37 which is clamped to a bar 32 secured to the shaft 5 and also at 33 to the. table. The pressure member 42 is secured by dowel pins 65, 66 to a holder 67 formed with a flange 68 at one side and a detachable cap 69 at the other side and slidable on a bar 47 loosely fitted over the shaft 5 and rigidly secured at its end by a post 48 to the bench 3. If the apparatus is used for coiling or for making alternate bends in opposite directions an extension bar 50 and anchor and lock 60 are fitted between the member 42 and the holder 67 so as to keep the coils &c. free from the operating mechanism. In forming a coil a bend is first made, the former and work holder then returned to initial position the bend shifted clear of the frame and the work rotated through an angle of less than 180‹ about the longitudinal axis of the unbent portion, whereupon the work holder and pressure, jaw are returned to operative position and the bending continued. In forming alternate bends in opposite directions the work is rotated through 180‹ after the first bend is made prior to making the second bend. The holder 67 has a lug 78 mounted on a pivot 85 in a recess in a saddle 79, which is grooved or has a detachable flange to engage the bar 47 and also a second bar 82, Fig.6, and is secured by a cap 83. When the bar 50 is, omitted the holder is allowed to rock on its pivot to avoid kinks in the work but if the bar is present a filled block 86 is secured by a latch 87 in the saddle to fix the lug. The pressure jaw is actuated by links 89, 92 from pitmen 101 connected by bolts 103 to a disc 100 which is rotated in plates 97 on an anchor block 90 by a handle 104, the motion being limited by a screw stop 105. The link 92 is pivoted to the anchor block which is secured to the bars 47, 82 by a cap 93. The anchor block is engaged by a screw 108 carried by an adjustable post 106. In a modification, Fig. 25, the pressure member 172 may be secured by dowel pins 175 to a holder 173 similar to the holder 67 but flush with the top of the former and bar 50, the holder being pivoted to a saddle 177 and cap having re-entrant flanges to engage the bar 47. The saddle is connected by a bar 50 to a block 60 and second holder 67 pivoted to a second saddle 83. The former may consist of a hub 110, Fig. 8, provided with flanges 112, between which is secured a ribbed intermediate arcuate member 113 with a grooved edge in which one of a number of formers 117 is secured, the former being slightly larger than the member 113 so as to prevent breaking the work at the end of the bend. Any of the members may be used as a former according to the radius of bend desired. When bending angle irons 120, Fig. 10, the holder 132, 133 for the pressure jaw 42 has extension plates 134 for retaining, a pair of adjustable rollers 140 for preventing wrinkling of the metal, one or other of the rollers having a groove to receive one of the flanges of the iron. The pressure member may also be similarly grooved. When bending channel bars two grooves may be provided in the pressure member and former. In order to strengthen such a grooved former it is made integral with the upper end of the shaft 5 and its upper end is supported by a bracing bar 150, Fig. 11, having a screw 153 bearing against an anchor 152 secured to the bar 47. For adjustment purposes, such formers of different sizes &c. may be integral with extensions 125, Fig. 7, of the shaft 5, the extensions having sockets 126 engaging tenons 124 on the shaft and secured by a taper pin 127 and set screw 131 passing through a collar 129. For heavy work the upper end of the former may be supported by adjustable blocks 163, Fig. 21, mounted in a pair of bracing arms 156, which are secured together by a cap 166, clips 160 and screws and are supported on columns 155 carried by the bench 3. A crane 168 may be mounted on a column 169 for handling heavy work.