Patent GB-722200-A (GB)
Title: Tack or staple pulling machine
Inventor: BROMLEY JOSIAH HENRY
IPC: A43D61/00
Filed: 1952-03-17
Abstract: 722,200. Nail and staple extracting machines. STANDARD ENGINEERING CO., Ltd. March 17, 1953 [March 17, 1952]. No. 6859/52. Class 61. [Also in Group VII]. A tack or staple pulling machine comprising a high speed withdrawing tool arranged for cyclic movement, mechanism for connecting the tool with a rotary drive, and an actuating member for the mechanism, the latter being constructed so that momentary actuation will cause the tool to be moved at high speed through a single complete cycle whilst continued actuation will cause the tool to be moved continuously at high speed through a succession of cycles. A rotary cam 4 with a conical clutch member 3, and a conical brake member 5 are spaced along and keyed to a shaft 2 on which is a freely mounted driving pulley 6 having a complementary clutch member 7. The pulley is attached by a non rotary yoke linkage 8 to a complementary brake member 9, a bearing 10 permitting relative rotary motion between the linkage and the pulley. Alternatively the member 9 may rotate with the shaft, with member 5 fixed. The space between members 7 and 9 is adjusted by a screw 12. A spring 9a balances member 9 and shield 11. Lever 14 pivoted to the frame 1 carries a cam follower 13, lever 15 pivoted to the frame is connected to linkage 8 by butts 16 for moving pulley 6 and member 9 along shaft 2, and link 17 pivoted to lever 14 carries a dog 18 engageable with a dog 19 on lever 15, is coupled by rod 20 to an actuating pedal 21, and is returned by springs 22, 23. The cam 4 is arranged, preferably when the withdrawing tool is lowermost, to swing lever 14 to a first position to engage the brake when levers 14, 15 are coupled by dogs 18, 19. When the dogs are disengaged by depression of pedal 21; springs 24 swing lever 15 to engage the clutch. Cam 4 then rotates and moves levers 14, 17 away from lever 15 to a second position to-permit re-engagement of the dogs, and then returns lever 14 to the first position. If pedal 21 has been released, permitting the dogs to re-engage, the brake is applied, completing a cycle. An extension of link 17 beyond dog 18 slides below and relatively to dog 19 when lever 14 is adjacent its second position, to act as a stop. A boss 27 is adjustably secured to a boss 25 mounted on shaft 2 by bolts passing through slots, and is eccentrically attached to a shaft 29 to which a link 30 is journaled. The latter is pivotally connected through a link 31 to a boss 32 of the tool head 33. This head is mounted on a bearing on shaft 2 and secured to frame 1 by bolts 35 and slots, on arm 37 operating one bolt and the head being angularly adjustable by arm 38. A tool holder 41 adjustably secured in a bracket on link 30 by a screw 40 receives a tool 42 shaped as a nail lift at one end and as a spiked staple lift at the other. The rotation of shaft 29 and the rocking of link 30 cause the end of the tool to describe an inclined ellipse in a vertical plane. Parallel plates 44, embracing the lowermost position of the tool and acting as a guard, are connected together and pivoted at 48 to an arm clamped into boss 32. Plates 44 are located by spring 46 (not shown) and an adjusting screw 47. A hinged plate 49 covers the upper part of the machine, and a clipped on pan 50 catches tacks &c. To withdraw lasting tacks pedal 21 is kept depressed and the shoe run along plates 44, if a tack close to the feather is to be removed the hood is positioned and the pedal depressed momentarily, and to withdraw staples the tool is hooked under each staple in turn and the pedal depressed momentarily.