Patent GB-146179-A (GB)
Title: An improved machine for making split rings, split pins, washers, rope thimbles, pipe collars and similar articles
IPC: B21F45/00
Filed: 1920-06-25
Abstract: 146,179. Athimon, F., March 31, 1919, [Convention date]. Split pins; washers; thimbles jor ropes; fastenings; rings.-In a machine for making split cotter pins, spring washers, rope thimbles, pipe collars and the like, a series of mandrels, bending arms, and severing knives or punches are mounted on a pair of rotatable disks and are operated by fixed gradients. In the form shown in Figs. 1 and 2 for making split pins, the disks g, g<1> are provided with a series of slotted sockets containing plungers l, l<1> carrying rollers n and pressed by springs m, m<1> against a fixed gradient o. The plungers l carry mandrel bars q pressed by springs p<1> against a fixed gradient r and the plungers l<1> are each furnished with a semi-cylindrical recess to receive the corresponding mandrel when it is pressed forward by the gradient. Mounted in a peripheral groove j between the disks is a series of pairs of pivoted bending arms a, a<1>, in the centre of each pair of which one of the mandrels is arranged to operate and on each side of which is arranged a series of pairs of cutters u, the fixed cutter being mounted in the disk g and the axially movable cutters being mounted in the disk g<1>. The fixed cutter, Fig. 12<a>, has oppositely bevelled steps 59, 61 and the movable cutter, which is pressed out by a spring against a fixed gradient is of the form shown in Fig. 12<b>, consisting of an upper nose 52 with lower bevelled edges 53, 54, a lower nose 55 bevelled at 56, and a lateral undercut recess 62. The part 57 forms the cutting portion. The wire T passes from a reel through the cutters by which it is fed through the machine until severed by the cutters. The cutters are alternately arranged back and front with respect to the direction of rotation of the disk, thus providing alternately two movable cutters followed by two stationary cutters so that the sections of wire after being cut are parallel to the plane of rotation. During the first part of the motion of the disks, the mandrels are pushed forward over the wire and when the plungers reach the gradient o the mandrel is pushed forward. When the wire is out, the ends are first held in the hollows u, u<1> of the cutters. 'On further movement of the disks the cutters open and the mandrel moves forward until the part v on the plunger engages the heel-pieces e, e<1> on the arms a, a<1>, which are thereby closed to complete the bend. When the plunger moves :away from the gradient o, the arms open by action of spring c, the mandrel is withdrawn and the finished pin ejected by gravity and centrifugal force. A series of wires may be fed side by side to the machine. In making " Grover " washers, the plungers l<1> may be omitted, the mandrel q being made of larger section. The cutters may be bevelled as shown in Fig. 15 and the movable cutters throughout the series arranged behind the fixed cutters so that the wire after cutting may be arranged obliquely to give the washer a spiral form. In making rope thimbles, the mandrel is grooved, Fig. 18, and is made in two parts q, q<1> to facilitate ejection. The bending arms are formed with projections of semi-circular section to give the desired section to the strip. The severing is performed by punches, the fixed punch z having a diamond-shaped section and the movable punch s having an cpening of corresponding form so that the ends of the strip may be forked. The cuttings are ejected through the lateral slot in the punch. In making collars or clips for holding pipes, the mandrd q is as shown in Fig. 21 having holes for engagement with punches w, w' on the bending arms and also for discharge of cuttings. In order that the ends of the strip may be rounded, the punch is shaped to fit a die z, Fig. 24, apertures z<1> beiny provided for the escape of cuttings.