Patent GB-1228710-A (GB)
IPC: E04C5/00
Filed: 1969-09-03
Abstract: 1,228,710. Twisting wires together. J. E. WARD. 3 Sept., 1969 [9 Sept., 1968; 31 July, 1969], No. 43521/69. Headings B3E and B3W. A wire tying tool comprises power means including a piston 36 reciprocally carried by a body 10, drive means including a tube 60 rotatably carried by the body 10, a helically grooved stem 64 interconnecting the piston 36 and tube 16 for rotating the latter in one direction during movement of the piston 36 in one direction, and rotating the tube 60 in the opposite direction during movement of the piston 36 in the opposite direction, a sleeve 98 mounted on the tube 16 for rotation therewith and reciprocating relative thereto, a wire feeder 136, 138 carried by the body 10, gears 116 and 142 operably connecting the sleeve 98 with the feeder for actuating the latter when the tube 60 and sleeve 98 are rotated in said one direction, a wire guide 134, 148 and 154 to feed the wire into a loop around an object to be tied, cutters 114 for severing the wire after the formation of the loop, presenting a pair of loop ends, a piston 118 carried by the body for shifting the sleeve 98 relative to the tube 60 in a direction to sever the wire, and chuck means 106 having a first jaw on the tube and a second jaw on the sleeve for clamping the ends of the wire, whereby the latter are twisted to attach the loop to said object when the tube and sleeve are rotated in said opposite direction.  In operation the tool is positioned using rods 162 and then trigger 44 is actuated to move valve 20 so as to allow air to flow into cylinder 34 between piston 36 and plug 56. Movement of piston 36 to the left as seen in Fig. 2 cause stem 64 to rotate the tube 60 in one direction through grooves 70 and keys 72 and sleeve 98 will also be rotated which drives gears 116 and 142 to rotate feeder disc 138. As piston 36 approaches bulkhead 58, loop 150 is formed, Fig. 1, and pin 38 will be moved by the piston, thus shifting valve 20 forwardly. Air between piston 36 and bulkhead 58 enters tube 60 flowing into cup 120 from passage 124. Piston 118 will shift sleeve 98 outwardly causing gear 116 to slide relative to gear 142 and moving cutter 114 to show the wire across the end of guide 134  presenting a second end of the loop 150 on that side of plug 108 diametrically opposed to loop end 152. Sleeve 98 continues to move outwardly until chuck 106 operates to clamp the ends of the loop 150 between jaws 104 and 110. At this  moment air pressure between bulkhead 58 and piston 36 drives the latter towards plug 56, the return movement of stem 64 causing rotation of tube 60 in the opposite direction, thus twisting the wire around the object. A clutch 146 stops any retrograde rotation of disc 138. As piston 36 approaches plug 56 it engages pin 40 closing port 30 and 32 and opening ports 24 and 26. Smaller wire loops 150 may be formed by moving lug 78 away from lug 74 so that the bulkhead 58 may rotate to an extent equal to the distance between stop 76 and lug 78. The smaller diameter loop requires repositioning of chuck 106. As the distance between stop 76 and lug 78 is increased, hub 92, rotating in nut nut 94, shifts jaws 104 and 110 inwardly, placing jaw 110 closer to anvil. 148. In one embodiment two rods 162<SP>1</SP> mount a plate 200 while a third rod 162<SP>1</SP> coacts with a fastener 202 to mount a second plate 204. Plates 200 and 204 are shiftable on rods 162<SP>1</SP> and fastener 202 toward or away from body 10<SP>1</SP> but biased outwardly into a common plane by spring 206. When twisting commences the ends of loop 228 come into engagement with bevelled edges 210 and 216 of elements 208 and 214 respectively, camming the corresponding plates 200 and 204 outwardly of body 10<SP>1</SP> which shifts the tool away from the object being tied.