US744071A - Hoisting device. - Google Patents

Description

No. 744,071. PATENTED NOV. 17, 1903.

J. HAYWARD.

'HOISTING DEVICE.

APPLICATION FILED MAR. 19, 1903.

N0 MODEL.

m4 o I WITNESSES:

- A Tron/v5)" UNITED STATES Patented November 17, 1903.

JUDSON .HAYVVARD, OF NEW YORK, N; Y.

HOISTING DEVICE.

SPECIFICATION forming part of Letters Patent No. 744,071, dated November 17, 1903.

Application filed March 19, 1903- To ail whom it may concern.-

Be it known that I, J UDSON HAYWARD, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented certain new and useful Improvements in Hoisting Devices, of which the following is a specification.

My invention relates to improvements in hoisting devices, and particulary to means by which the horizontal swinging of a boom is effected and controlled.

My invention will be hereinafter defined in the claims.

I have shown a preferred embodiment of my invention in the drawings accompanying herewith, in which-= Figure 1 is a plan view with certain parts removed and in section. Fig. 2 is aside elevation, and Fig. 3 is a diagram showing in front elevation the manner of arranging and leading the rope by which the boom is held.

My invention is applicable to booms of any type, but is more particularly designed for use with booms of that type known as antomatic swinging booms. Such booms are provided with pivots so inclined that the boom tends to swing to a central position from a point on either side thereof. With these booms is employed a two-rope hoisting system, one rope being on each side of the boom, said ropes passing through guides somewhat removed from the foot of the boom, so that if one rope be strained more than the other the boom will tend to swing to that side.

In the accompanying drawings, A represents a derrick-frame; B, a boom pivoted thereto at C in the manner described; F and F, the two hoisting-ropes; G and G, the drums which operate said ropes, and H H the guides for said ropes, said guides being located laterally removed from the boom either at the level of the foot of the booth, as shown, or at any other desired level. The above mechanism is common to the ordinary automatic swinging booms. It has been found that with a boom so equipped it is not always possible to control it in the manner desired. For instance, when such a boom is used with a clam-shell or equivalent type of automatic bucket using an opening and closing rope it Serial No. 1 48,545. (No an.)

can be made to dig only in the central position; also, when the bucket is dumped at one side of the center the strain of the holding or hoisting rope when closing-rope is released when the strain is thrown upon the holdingrope the boom commences to swing back before the bucket is properly placed to dig. To remove these objections and to improve the operation of the device, I have added my novel features.

Tothe boom at a point sufficiently removed from its lower pivoted end is secured the ends of holding-ropes E. Means are provided for taking in and paying out these ropes as the boom swings and also for holding said ropes, as well as for taking up slack, so that the controlling action upon the boom is instant. In the means herein shown the holding-rope E is substantially endless, and the means for taking up and paying out the ropes consist of the drums D and D. These drums constitute a convenient means for taking up and paying out the ropes and, together with the brakes, for holding them; but it is evident that other means may be employed for securing the same results. It is also evidentthat instead of a single rope, as shown, three ropes may be used, two leading from the boom each to its respective drum and a third forming a loop between the twodrums. Each side of the rope leads from the boom to and over a guide-pulley 1', carried by the derrickframe at a point laterally removed from the boom, so that byholding one or the other'of these ropes the boom may be prevented from swinging in either direction. The ends of this rope are then carried each about its respective drum D or D a sufficient number of times to secure a good frictional grip thereon. If desired, the rope may be clamped or otherwise secured to the drum. The rope preferably passes over guide-pulleys I, intermediate the pulleys I and the drums. Between the two drnms is what may be called a compensating rotative connection, by which term I mean a connection whereby as each drum is turned to pay out rope it tends to turn the other so as to take in its rope and yet a connection of such a yielding or flexible character that compensation is made for variation in amount of rope required. In other words,the rotative connection is of such nature that there may be a variation in the rates of the two drums without affecting the rotative effect. The means herein shown for accomplishing this result consists of the elevated pulleys LL ,over which the rope between the drums passes, and the tension-weight W, which is suspended from a pulley L, carried by a loop of-the rope extending between the pulleys L and L This device causes each drum to tend to turn the other,and yet permits variations in their rates of turning. The weight acts both asa take-up and a tension for the ropes. The means herein shown for holding the rope consists of a band-brake J upon each drum, said brakes being controlled by levers k through rods k and the brake-lever K. Any other means for holding the ropes which will permit the free running thereof when desired may be used. The amount of rope extending from the boom to both guide-pulleys I is not the same for all positions of the boom; but the take-up device (most clearly shown in Fig. 3) compensates for this and keeps the rope at all times taut, so that when the brake is applied its restraining action is immediately felt upon the boom. Without such a device there would be a certain amount of slack to take up, which process would result in a shock when the rope became taut, and this would strain the parts, as well as interfere with certain and exact handling of the load. With a device such as herein described no trouble of this sort occurs. The brakes may be applied to the drums separately, but preferably both together. As the slack-taking weightis between the drums or the means by which the rope is held, it does not have to resist any of the pull of the boom, but need only be sufficient to take up slack and the friction of the drum and guide-pulleys. By these means the boom may be securelyheld in any position, irrespective of how the main ropes F F are operated. The drums D D need not be connected in any way with a motor or driving mechanism, as it is not necessary that they should communicate any power to the rope, but only hold it. They may be placed wherever most convenient.

It is evident that my'invention may be embodied in other forms than that herein shown. I do not, therefore, desire to be limited to this particular form of device.

2. I11 combination, a swinging boom, a holding-rope having its ends secured to the boom, guides for said rope laterally removed from the boom, independent means for holding each branch of said rope, and a take-up and tension device acting upon said rope between said holding means.

3. In combination, aswinging boom, aholding-rope having its ends secured to the boom and extending laterally to either side, independent means for holding each branch of said rope, and a running take-up and tension device acting upon said rope between the holding devices.

4. In combination, a swinging boom, a holding-rope having its ends secured tothe boom, guides for said rope located to either side of the boom, two drums about each, of which one branch of the rope passes, brakes on said drums, a loop in said rope between the drums, and a weight suspended in said loop.

5. In combination, a swinging boom, holding-ropes adapted to control the swinging of said boom, independent means for holding each of the holding-ropes, and a take-up and tension device acting upon said ropes between the said holding means.

6. In combination, a swinging boom, holding-ropes adapted to control the swinging of said boom, independent holding means acting upon each holding-rope,'and a compensating tension and takeup device acting upon the ropes between said holding means.

' 7. In combination, a swinging boom, aholding-rope having its ends secured to the boom from opposite sides and adapted to control the swinging of said boom, independent holding devices for each branch of the rope, and a tension and take-up device having a run ning engagement with the central portion of the rope between the holding devices.

8. In a hoisting device in combination, a boom, two hoisting ropes, guides for said ropes removed from the boom at either side thereof, means for operating said ropes independently, controlling-ropes connected with said boom and extending to either side thereof, guides for the controlling-ropes removed laterally from the boom, means for holding upon said controlling-ropes and means for automatically keeping said ropes taut.

9. In a hoisting device in combination, a.

pendently, eontrollingropes connected with In testimony whereof I have hereunto afsaid boomand extending to either side therefixed. my signature, this 16th day of March, IO of, guides for the controlling-ropes removed 1903, in the presence of two witnesses.

laterally from the boom, two drums each re- JUDSON HAYWARD ceiving one of said ropes, brakes for said drums, a rope winding upon both drums and Witnesses:

. having a loop between the drnmsandaweighi 1 H. L. REYNOLDS,

suspended in said 100p. l J. H. HAYWARD.

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