| 摘要 |
662,420. Moulding-machines. DEHN, S. G. (Pettibone-Mulliken Corporation). Dec, 13, 1949, No. 32005/49. Class 83 (i). In a moulding machine of the type in which a rotary sand projector 29 is carried on a horizontal arm 28 pivoted to the end of a horizontal jib 27 which is pivoted to a fixed standard 26, as in Specification 565,861, [Group XXXVI], the projector is moved into any desired position by hydraulic means including a hydraulic actuating unit extending between the jib 27 and standard 26. A lever 80 pivoted to a fixed base 213 controls two hydraulic cylinder and piston units 76, 77, the former being pivoted to an arm 88 fixed to the standard and to a lug 95 of the jib and the latter to the jib and arm. The hand lever 80, Fig. 15, is mounted to move in any direction from the vertical in which it is held by a spring 225. These movements produce axial and rotary motion in a rod 240, the first causing a crank-lever 250, 253, Fig. 12, to turn about a vertical pivot 255 to move a rod 251 axially and operate a valve 78 controlling a piston 82, Fig. 9, connected to the jib 27, its cylinder 81 being pivoted to the arm 88. Rotary movement of the rod 240 acts, through an adjustable link 266, Fig. 13, on a lever 260, pivoted at 265 on the lever 252, to operate a valve 79 controlling a piston 100, Fig. 9, connected to the arm 28, its cylinder 99 being pivoted to the jib 27. The pump 145 which delivers pressure oil to the valves'78, 79 draws the oil through filters 164 from a compartment 157, exhaust oil being returned to a compartment 154 whence it can pass through perforated plates 151, 152, 153 to compartment 157. Flexible pipes are used where required. The lever 80, valves and pipes are arranged so that the movements of the projector 29 copy those of the lever. This and the piston rods are protected from sand &c. by bellows-type sleeves 235. Byepass valves 207, 209, Fig. 9, prevent sudden stoppages of the movements of the arm and jib. |
