Patent GB-558457-A (GB)
Title: Apparatus for the manufacture of hollow staybolts
IPC: C21D9/00
Filed: 1942-01-26
Abstract: 558,457. Carburizing and coating stay bolts ; door-operating appliances. FLANNERY BOLT CO., and GROVES, W. W. Jan. 26, 1942, No. 1058. Addition to 548,966. [A Specification was laid open to inspection under Sect. 91, of the Acts, July 31, 1942.] [Classes 72 and 82 (ii)] [Also in Group XXV] In apparatus for the manufacture of hollow staybolts as described in the parent Specification, one of the stations is an unloading one with a quenching tank arranged adjacent to it, a second rotatable crane from which a carrier for the staybolts is suspended is provided for introducing and removing bolts from the quenching tank. Each furnace is provided with a movable cover and means for operating the cover, and means controlled by these opening means are provided to control the operation of the main crane which can then only be moved up and down when the cover is in open position. Beside the unloading station '20 is arranged a station 32 provided with a quenching tank between which and a station 33 having a washing tank is mounted a second crane 24 comprising a beam 28 Fig. 6, carried by a rod 27 attached to a piston 26 working in a cylinder 25 and provided with rods 30 from which are suspended carriers 29. The frame 81 of the carrier 29 has a perforated base plate 82, Fig. 8, and a second perforated plate 83 and below the latter is a perforated movable plate 84. The carrier 29 with the ends of the coated bolts resting on the plate 84, the holes in which are out of register with the holes in the plates 82. 83 is first lowered into the quenching tank 32' at the station 32 and allowed to remain there for some time. Then the crane is operated to raise the beam 28 and raise the carrier 29 for the tank 32<SP>1</SP>, and then to rotate the beam 28 to carry the carrier 29 over the washing tank at 87, and lower the carrier into the tank. The water in the tank is kept at a constant depth and heated by a combustion chamber 88, the upper part of the tank being separated from the lower by a partition 89 of less length than the tank, the water being circulated rapidly by impellors 90. The movable plate 84 of the carrier 29 is now moved to allow the holes therein to register with the holes in the plate 82, 83 and so release the coated bolts from the carrier. The cyaniding both at the station 22 and the preheating furnaces at station 21 are both provided with two doors 48, Fig. 4, horizontally movable on rails 47 at the top of the furnace frame by rollers 49 and comprising vibratory slabs of sufficient length to cover the open top of the furnace and mounted in metal frames. The doors are moved in the opposite direction by bell cranks 50 operated by another bell crank 52, the arm 53 of which is connected by links 55, 56 to the ends of the cranks 50 the other arm 54 being connected by a link 59 to a piston rod 58 carrying a piston 60 Fig. 5 moving in a, cylinder 57, into which opens a tubular passage 65 in the rod 58. One end of the cylinder 57 is provided with an extension 61 having an enlarged end 62 in which is provided an annular chamber 63 into which opens a pipe 64 and also radiad passage 60 connecting the passage 65 with the chamber. To control the movement of the main crane 2, Fig. 14, and also operate the doors 47 a pipe 67 leads from a source of fluid pressure into a pipe 68 connected with two three-way valves 69, 70 provided with operating handles 69a, 70a. Leading from the valve 69 is a pipe 71 with a branch 72 leading to the cylinder 57 and a branch 73 to the corresponding end of a cylinder 74 mounted on the furnace at station 22, and connected by a pipe 77 to the pipe 76 leading to the valve 70 and the cylinder 57. When the valve 69 is in the position shown in Fig. 14 fluid flows into the cylinder 57 and moves the piston 60 to the right thus establishing connection by the passage 68, the openings 66, the chamber 63 with the pipe 64. The fluid then flows to the crane 2 raising the same and at the same time opening the doors of the furnace at station 21, and those at the furnace at station 22 by the simultaneous operation of the piston in the cylinder 74. To lower the crane 2 and close the doors of the furnaces the handle 69a is moved as far as possible to the right and fluid then flows through the pipe 64 into the cylinder 57 and out to the pipes 71, 72 to the exhaust 78. At the time when the valve 69 is open the valve 70 establishes connection between the pipe 76 and exhaust 78 so that movement of the lever 69a also moves the lever 70a.