Patent GB-190827750-A (GB)
Title: Devices for Refacing Valve Seats.
Inventor: FAIRWEATHER WALLACE
Filed: 1908-12-21
Granted: 1909-12-21
Abstract: 27,750. Fairweather, W., [General Pump Appliance Co.]. Dec. 21. End-facing ; lathes.-In a machine which is inserted through band-holes in the casing of power pumps &c. for refacing the valve seats in situ, a fixed stem 1 is screwed to the valve seat 2 and carries the rotary refacing-apparatus. The valve stem, surrounded by a sleeve, may replace the stem. The casing 12, which contains the driving - gear, is moved around a vertical axis and fixed in position by a spring bolt 30 'engaging one of a number of holes in a sleeve 32 mounted on the stem 1. The flexible sbaft 10 and bevel-wheels 8, 7 are mounted in a sleeve 11, which is rotated to bring the spindle 9 to the most convenient angular position, and is then fixed by screws. The bevel-wheel 5 engages a bevel-wheel 4 fixed to a plate 3, which is connected by screws 34 to a casing 13 and carries one or more cutting-tools such as 25, 26, Fig. 2. In order to provide for different diameters of seats, different diameters of plates such as 3 may be used, the screws 34 being accessible through a hole in the casing, which is closed by a plug 35. Mounted between the wheel 4 and the casing 13 are two spurwheels such as 15, which engage a fixed spurwheel 16 on the stem 1. On the spur-wheel shafts are fixed, by screws 36, the worm-wheels 17, 18, which engage worms on the screws 21, 22 that adjust the tools longitudinally while they are being rotated round the stem 1. The tools are fixed to the blocks 23, 24 by plates 47 and screws. The blocks slide in dovetail guides 43, 44, 28, 27 fixed to the plate by screws 45 ; to adjust for wear, the plates 28, 27 are also provided with screws 46 abutting against the plate 3, Fig. 7. The gear 16 is fixed to the stem 1 by a cross-piece 40 carried by a bolt 37 which has a head 38 and is pressed upwards by a spring 39, which also tends to give it a turning movement so as to press a projection 41 against a recess in a slot in the stem. At the end of a cut, the motor is reversed, and when the cutters are brought back to the position shown in Fig. 2, a screw 49 moves the projection 41 out of the recess, and the bolt is pressed upwards by the spring to disengage the gear 16 and thus stop the feed. The bolt is reset by hand. The apparatus is vertically adjusted by turning a cap 56, which is connected by screws 54 to a sleeve 53 with a threaded flange 58, engaging the screwed part of the stem. The sleeve 53 supports the sleeve 32 screwed to the ring 29, on which the casing &c. 13 is suspended by a washer 50 secured to the casing 13. A washer 51 is also threaded to engage the inner side of the ring 29 to take up all play and lost motion. This is prevented from rotating during adjustment by a washer 52 with lugs which are pressed into a slot 62 in the stem by a screw 53. After adjustment, the cap, which has two saw cuts, is fixed by a tapered washer 55, provided with a saw cut and engaging the screwed flange 58 of the ring 53, which also has two saw cuts. The cap may be further secured by a spring latch 63<a> pivoted on the screw 63 engaging notches in the cap. A gauge for a rough vertical adjustment consists of a block 65, Fig. 8, clamped by a slot 66 and screw 67 to the plate 3 and having a vertically adjustable foot 68.