| 摘要 |
<p>415,765. Operating lift gates. RYDER, F. E., Turner Bridge, and WADSWORTH & SONS, Ltd., W., High Street, both in Bolton. March 1, 1933, No. 6223. [Class 65 (i).] In door-operating mechanism comprising a lever pivoted to the door frame and linked to the door with poweractuated means for moving the mechanism in one direction and resilient means to produce the reverse movement, the power-actuated means and the resilient means are pivotally connected to the lever at the same point and are placed one above and one below the lever. The Figure shows a gate of the lazy-tongs type operated by a lever c pivoted to the door frame on the right and connected to the gate by a link b ; the gate is opened by a pneumatic cylinder g, which is pivoted to the door frame and has its piston rod pivoted to a bracket i on the lever c, and is closed by a spring k surrounding the piston-rod of a dash-pot l which is also pivoted to the bracket i and has its piston-rod pivoted to the door-frame. The lever c opens a switch y, when the gate leaves its closed position, to open the circuit of the hoisting motor of the lift. In the operation of doors comprising two overlapping sliding sections, one of which has to move twice as fast as the other, the door sections are carried by sleeves running on roller or ball bearings, and the operating mechanism is connected to one section only, the other section being operated by a connection between the sleeve of the slower door section and the cage holding the balls or rollers of the other section.</p> |
