Improvements in Machinery for Boring and Facing and for Screwing Tube Fittings.

摘要

26,113. Platt, I. Dec. 21. Boring; end-facing; screwing.-A machine for boring, facing, and screwing tube fittings is shown as applied to the tapping of tees, which are contained in a magazine 26, and fall one by one into a recess 31 in a slide 29, the slide being moved to grip each fitting against a fixed block 28 on the frame 11 while being tapped. The arms of the tee are brought coaxial with two opposed tapspindles (not shown), while the stem 25 is coaxial with a third spindle 3, the spindles being connected by bevel-wheels engaging a crown-wheel 22, the boss 24 of which is hollow to allow the screwed fittings to fall into a receptacle when released by the slide 29. The tap-spindles are feathered in sleeves carrying the bevel-wheels, the sleeve 12 of the spindle 3 being screwed and driven by gearing 15, 16 from a shaft 17 provided with a heavy fast pulley 18 and loose pulleys 19, 20 driven by open and crossed belts. The slide is drawn into the clamping position by weighted arms 45 connected to the slide by links 47 so as to act as toggles. The machine is started by throwing over a weighted arm 44 controlling the sliding slotted plate 33 for rocking the belt forks. The taps are then advanced by screws on their rear ends or by other mechanism to tap the fitting, till a nut 32 travelling on the sleeve 12 strikes a stop on the plate 33 and reverses the machine to withdraw the taps. The movement of the nut in the opposite direction causes it to engage cam projections 51 on the arms 45 after the taps are withdrawn thus raising the arms and moving back the slide to release the finished tee and to allow a fresh one to fall into it, after which the nut reverses the machine and the cycle is repeated. A feed-mechanism for the tap-spindles which avoids the use of a fine pitch feed-screw for facing and tapping comprises a pinion 56, Fig. 9, on each tap-spindle, gearing with a wheel 57 carrying a screwed sleeve 59 mounted on a stud 58, and having pins 61 engaging levers 62 pivoted at 64 to brackets on the frame. The levers have cam slots 67 engaging pins 68 on a sleeve 70 held endwise on the tapspindle, the rotation of the sleeve 59 rocking the levers to feed or withdraw the spindle and facing- cutter carried by it. For tapping, the pivots 64 are withdrawn and the pins 61, 68 tightened up so that the tap moves at a speed determined by the screwed sleeve 59. Fig. 11 shows a modified form of feed-mechanism for the facing-cutter in which a bracket 73 has pivoted to it at 77 a lever 76 with a pin 75 engaging an inclined slot 74 in a nut 72 sliding in the bracket and actuated by the screwed end 71 of the tap-spindle. A second pin 78 on the lever engages a groove 79 in the spindle to feed and withdraw the cutter. A preferred form of facing-cutter comprises a holder 80, Fig. 14, and two symmetrically situated flat cutters 81. For tapping elbows, the tap from one spindle is removed, while for crosses, three holes are tapped in this machine and the fourth in another machine in the usual way. The Provisional Specification states that the machine may have one vertical spindle and a horizontal magazine. When boring the fittings, the taps are replaced by suitable tools. the feed-mechanism being the same as that described for tapping.