GB846256A - Double acting diaphragm chuck - Google Patents

Abstract

846,256. Chucks. ERICKSON TOOL CO. April 14, 1959, No. 12643/59. Class 83 (3). A double-acting fluid-operated diaphragm chuck comprises a body 1 having a recess 2 and holes 3 for securing to a machine spindle, a phase 6 having swarf-clearing notches 10, a diaphragm 7 secured to the body 1 by screws 8, a piston 5 axially-movable in a cylinder 4 and, secured thereto by a nut 11, an actuator 12 having a flange 14 engaging the diaphragm 7. A sleeve 17 co-operating with the piston, engages one side of the diaphragm, and the fluid supply 25 is connected, through a valve 24 and a connection 27, to the ends of the cylinder 28, 36, by concentric pipes 21, 29, respectively. Jaws 56, having slots 57, are adjustably secured to dove-tailed members 53, by screws 58, the members 53 being secured to the diaphragm 7 by blocks 52, screws 50 and dowels 51. The radially-outward position of the jaws is limited by stops 61 having adjustable screws 59. A work-stop 42 is secured to screws 41 in plate 6, the screws extending through openings 40 in the diaphragm, which are sealed by 0-rings 45. In operation, with valve member 23 in the dotted-line position of Fig. 1, air is admitted to line 26 through a non-rotating connection 27, into pipe 21 and thence to space 28 of cylinder 4. The piston 5 and sleeve 17 are moved to the right, the centre of the diaphragm is flexed and the jaws 56 swing outwardly, allowing work to be placed against plate 42. When the valve 23 is moved to the full-line position, the air is vented through pipe 21 and the diaphragm returns to its normal position, thus clamping the work. Air is also supplied through line 31 and pipe 29 to the space 36 in the cylinder 4, and the piston 5 and actuator 12 move to the legs and and flex the diaphragm to produce additional clamping-pressure.