GB433451A - A method of and motor for effecting progression of material on reciprocating chutes - Google Patents

Abstract

433,451. Motors for reciprocating conveyers. PLESSY, F. M., Velsen, Geislantern, Sarre, France. Dec. 15, 1933, Nos. 35333 and 35334. Convention dates, Dec. 15, 1932 and Dec. 7, 1933. [Classes 122 (i), 122 (ii), and 122 (iii)] In a fluid-pressure motor for reciprocating a shoot, during the stroke of advance the motive-fluid is admitted through an orifice progressively enlarging at the commencement of the stroke of advance and subsequently of constant area, said fluid being exhausted during the return stroke. The shoot moves with an acceleration increasing progressively to a maximum value when the motion is abruptly reversed causing the progression of the material conveyed. The reversal may be effected by compression and pressure fluid supplied to the other end of the cylinder, or the tool may be made single acting and the reversal effected by compression and fluid stored in a chamber supplied with steam to make up loss by exhaust. The primary exhaust from the left-hand end of the cylinder is progressively decreased. An auxiliary exhaust therefrom controlled by a compression-operated valve is also provided. In the construction shown in Fig. 5 the piston has a hollow, conical, perforated lantern 4 which enters a constricted portion 7 of the chest and an adjustable cup-shaped member 8 is arranged therein and controls the passage of fluid from the passage 9 into the chamber 6<1>, 6<2>. An auxiliary exhaust dust 46, controlled by a spring- pressed valve 48, moved from its seat by compression, is connected to the rear chamber 62. Grooves 47<1>, 47<2> permit the passage of fluid as soon as the valve 48 leaves its seat. The distributing slide valve 10 comprises pistons 12, 16, 13, is fluid-actuated, and is under the control of auxiliary slide valves 20, 26 moved in one direction by the main piston and in the other direction by main i pressure-fluid from a pipe 29 connected to the ends of the auxiliary cylinders 18, 24. Valve 20 alternately puts the valve chamber 14 to pressure and exhaust. The chamber 15 is connected by ports 23, 23<2> with the cylinder 24. A passage 41 connected to the main cylinder communicates with the cylinder 24 through ports 41<1>-41<4>. The main supply is led to a reservoir 40 through a needle valve 45 and a non-return ball valve 44. The head 16 of the valve 10 controls the admission to the passage 9 and to a cock-controlled passage 34 connected to the forward cylinder end through a non-return valve 43. The pistons 12, 13 control the exhaust passages 31, 32. The cock 35 may close the passage 34 and convert the cylinder to single action by connecting the part 36, 37 and the chamber 40. When the piston 11 is at the rear of the stroke, the lantern 4 enters the part 7 and member 8. The valve 26 is moved to the left, and the valve 10 to the right. Fluid enters the cylinder by the passage 30, recess in the valve 10, passage 9 and space between the parts 8, 7, 4. As the piston moves to the right the supply area increases until the supply is controlled by the area between the parts 8, 7. Exhaust on the right of the main piston passes through port 36 which may be tapered, cock 35 and passage 34 to the outlet 32. When the piston actuates the valve 20, the valve 10 is moved to the right. Fluid passes to the right of piston 1 and the fluid on the left exhausts through chamber 6<1>, 6<2> and passages 9, 31. When the lantern 4 enters the restriction 7, the exhaust is throttled and the cylinder pressure rises and valve 48 is opened. When the piston engages the valve rod 25 and opens port-41, a progressively increasing exhaust from the front end of the cylinder passes by ports 41<4>-41<1>. This exhaust, together with the restricted exhaust 4 produced by the lantern 4 slackens the speed of the piston 1. The valve 44, when the cylinder is single-acting, makes good the fluid exhausted by ports 41<4>-41<1>. The Specification as open to inspection under Sect. 91 describes a tool wherein the supply passage is controlled by an adjustable plug similar to the plug 8<1>, Fig. 8. A twoheader piston valve controls the main inlet; this is controlled by auxiliary piston valves with a number of control heads which are moved by tappet action by the main piston and by fluid-pressure. No compression-operated, auxiliary exhaust valve is provided. The tool may operate with single or doubleaction. This subject-matter does not appear in the Specification as accepted. o