US137464A - Improvement in elevators - Google Patents

Description

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P. W. MELLEN.

I Elevators. "No. 137,464'. ParentedAprilmas,

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P. W. MELLEN.

Elevators. N0. 137,464, Patented April 1, 187s.

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UNITED STATESl PATENT OEEICE.

PETER W. MELLEN, OF ST. LOUIS, MISSOURI.

IMPROVEMENTIN ELEVATORS.

Specification forming part of Letters Patent No. 137,464, dated April 1, 1873; application filed A November 21, 1872.

To all whom it may concern:

Be it known that I, PETER W. MELLEN, of the city and county of St. Louis and State of Missouri, have invented certain Improvements in Elevators, of which the following is a specication:

My invention consists, first, in the arrangement, in connection with the check-rope of the elevator, of a rock-shaft, to which is keyed an arm, the end of which is connected to links whose ends are jointed to brackets attached tothe check-rope, so that the rope does not partake of the side movement of the end of the arm to which it is connected, said rockshaft being provided with an arm connecting by a cross-bar with the reversing-lever keyed on the stem of the forked arm that operates the reversing-valves, so that when the operator pulls the check-rope the engines can be stopped or reversed, as desired, or, when at rest, started; second, in the arrangement on the hoisting-drum shaft of a Worm-wheel which is driven by a worm-screw on the crank-shaft of the engines, the object of which is to obviate, in lowering heavy loads, the excessive speed and heavy strain that are thrown on the engine where cog-gearing or belts are used to drive the hoisting-drum, as the screw takes up all the thrust ofthe drum and acts as a brake to prevent excessive speed; third, in the arrangement of the hoisting-drum loosely on its shaft and providing it with circularly-arran ged .ratchet-teeth, in which engage spring pawls or dogs pivoted to a hub which is keyed on the drum-shaft; the purpose of this arrangement is to prevent unwinding of the hoisting-rope from the drum, when the elevator is stopped iu its descent by any accidental cause, the shaft on which the drum is mounted being allowed to freely rotate'while the Vdrum is held stationary by the brake, which is always applied When the platform is not being raised; fourth, in the arrangement onthe rock-shaft above described of a groovedpulley to which is attached a cord connected to a weighted brake-lever, so that when operating the checkropes to cause the elevator to ascend the grooved pulley will take up a portion of the cord and lift the brake-lever and prevent the brake from acting on the drum, and when the check-rope is operated for descent of the elevator the brake will be thrown automatically into action by releasing its weighted lever; iifth, to the safety mechanism on the platform. This consists of a pair of dogs whose upper ends are pivoted in the top cross-bar of the hoister, and which are connected together by a horizontally-extending spring which passes through the strap of the hoisting-rope, which strap passes around the said cross-bar in such a manner as to have free vertical play or movement thereon, when the platform is not sustained by the rope; when the latter is the case the center of the spring connecting the dogs is raised, and the lower ends of the dogs are th us drawn back from the vertical safety-racks extending up the insides of the vertical guideposts of the platform.

Figure 1 is a front elevation. Fig. 2 is a detail rear elevation of drum, driving-screw, &c. Fig. 3 is a transverse section at line X X. Fig. 4 is detail axial section of steamcylinder and valves. Fig. 5 is a facesection of reversing-valve at line X X. Fig. 6 is au elevation of cylinder-ports. Fig. 7 Vis a face view of reversing-valve.

A are the cylinders of two engines set at half-stroke in relation to each other so as to carry over dead-centers.7

There is nothing novel claimed in the pistons or pitmen nor cranks.

The cylinder valve-seatB of each cylinder has two steam-ports, b b1, and an exhaust-port, b2. On this seat works an oscillating valve, C, having on the side toward the cylinder four ports, c cl 02 c3, and on the other side two segmental ports, c4 c5, oA1 being in communication with c1 o2, and c5 with c c3. The outer face of the valve C forms the seat of the circular concave-convex slide-valve D, which operates to put the ports c4 c5 alternately iu communication with the interior of the steam-chest E and with the exhaust-port b2. The valve D is operated by usual valve-stems and eccentrics on the main or crank shaft F. By means of the oscillating valve C and its ports c c1 c2 c3 04 o5 the engine can be either reversed or stopped, the stoppage of the engine being effected by bringing the flat portions c6 of the valve C over the ports b bl of the cylinder, and thereby shutting off steam from the same. To reverse the engine, (when the cylinders of the same are alternately receiving and exhausting steam through the ports c4 c1 b and c5 c3 121,) the valve C is oscillated so as to bring the ports c 02 in communication with the cylinder-ports b t1, respectively. The steam will then alternately enter an exhaust from the steam-cylinder through ports c3 c b and c4 c2 b1, and if' before the reversing the piston of the cylinder is on its down-stroke, and the cylinder receiving steam through ports c4 c1 b, and exhausting through ports b1 c3 c5, as indicated in Fig. 4, then, by oscillating the valve C so as to bring ports c c2 into communication with cylinderports b b1, the live steam will enter port 0 4 and pass through ports c2 b1 into the lower part of the steam-cylinder, and move the piston back before it has nished its stroke, and thus the reversing of the engine is achieved. The face of the valve C may be depressed or sunk at C1 to partly equalize the steam-pressure and lessen the friction. The valve (l turns on a circular flange, G2, occupying the circular rabbet in the exhaust-port b2. The valves C are operated by stems h h1, to which are keyed forked arms h2, engaging in lugs G3 on the valve C. The stems h h1 are connected together in the hub of the reversing-lever H by set-screws, so as to allow adjustment of valves (l on their seats. h4 is a stop guide for lever H. G is an arm keyed on the horizontal rockshaft G1, connecting with reversing-lever H by connecting-rod h3. G2 is an arm keyed on the rock-shaft G1, connecting with check-rope G3 by means of links g and hubs g1. g are jointed both to the lever G2 and also to the hubs or brackets g1, so as to permit the side movement of the end of the lever G2 (in its oscillation) to' take place without drawing the rope G3 from side to side, and thereby displacing it and changing its tension. I is a disk or other suitable valve arranged in the steam-supply pipe, the stem of which is provided with an arm, t', which is operated by the reversing-lever H through theconnecting-rod t. The purpose o f this arrangement is to automatically shut off steam from the steamchest when the engine is at rest, and thereby prevent the excessive steam-pressure on the valve (l, and lessen the friction of the same, met with in operating said reversing-valve C, and at the same time prevent the condensing of the steam in the steam-chest, &c. J is an endless screw upon the main or crank shaft F, which drives a worm-wheel, J1, keyed on the shaft j of the hoisting-drum J2. The drum J2, 011 which the hoisting-rope is wound, is mounted loosely on its shaft j. J 3 is a hub keyed on the shaft j, which is provided lwith spring pawls lor dogs j1, which engage in the circular ratchet j2, formed on the drum J2. K is a grooved pulley secured to the shaft G1; said pulley carries a cord, 7c, passing over suitable The links' pulleys to connect with the weighted leverarm K1 of the brake. k is the brake-band pivoted in standard K2, passing under the drum and secured to the end of the lever K1. By this arrangement the brake is automatically brought into action when the elevatorplatform is descending or at rest, and is thrown out of action when the elevator is ascending by the grooved pulley K and cord 7c lifting the brake-lever K1. L is the top cross-bar of the elevator, to which the wire rope is attached by means of the sliding strap L1. L2 are straight dogs pivoted in the cross-bar L, the ends of which engage in ratchet-bars L3, secured to the guide-posts L1of the elevator. lisaspring passing through the strap L1, the ends of which are secured to the dogs L2, and keep them out of engagement with the ratchet-bars L3, secured to the guide-post L4, until the wire rope becomes broken or disengaged 5 in that case thestrap L1 descends, allowing the spring to force the dogs L2 into engagement with the rack-bars L3, and thus prevent the falling of the elevator. M are pipes for carrying off the water condensed in the steam-chests vand, cylinders. g3 are collars attached to therope G3, which are acted on by a ring-arm, g1, to draw the rope and stop the engine when the platform has reached its highest or lowest elevation.

I claim- Y l. The combination and arrangement vof check-rope G3, links g, hubs g1, and arm G2, as and for the purpose set forth.

2. The combination and arrangement of' check-rope G3, shaft G1, arm G2, armrG, link h3, reversing-lever H, stems h h1, forked arm h2, and valve C, as and for the purpose set forth.

3. The combination and arrangement of check-rope G3, shaft G1, arm G2, grooved pulley K, cord lo, Weighted lever K1, and brakeband la', as and for the purpose set forth.

4. The drum J2, mounted loosely on its shaft j, and provided with circular ratchet-teeth j2, in combination with spring-dogs j1 and hubs J3, substantially as and for the purpose set forth.

5. The combination and arrangement of check-rope G3, shaft G1, arm G2, grooved pulley K, cord lc, weighted lever K1, brake-band a, drum J2, ratchet j2, spring-dogs 71, hubs J3, and shaft j, as and for the purpose set forth.v

6. The dogs L2, pivoted in cross-bar L, in combination with the straps L1, spring l, ratchet-bars L3, and guide-posts L4, as and for the purpose set forth. In testimony of which invention I have hereunto set my hand.

PETER W. MELLEN. Witnesses:

SAML. KNIGHT, ROBERT BURNs.

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