US2332331A - Hoist - Google Patents

Description

J. MELLING Oct. 19, 1943.

HOIST Filed Jan. 4, 1943 2 Sheets-Sheet. 1

Inventor.

/aymyw X Attorney Oct. 19, 1943. J. MELLING ,3

HOIST I Filed Jan. 4, 1945 2 Sheets-Sheet 2 v Patented Oct. 19, 1943 Joseph Melling, Frenchwood, Preston, England Application January 4, 1943, Serial No. 471,301 In Great Britain October 14, 1941 1 Claim.

The present invention relates to improvements in hoists.

According to the present invention a rope for raising a, load suspended by a hook or carriage engaging the rope on one side, is passed from a.

point adjacent to that at which the load is to be automatically delivered tov a higher point, and then forms a bight or loop to a point from which the load is to be raised, the free end of the bight or loop passing over a guide pulley disposed at a point higher than the said higher point.

The device may be mounted upon a mast or pulley of a ship, one end of the rope being attached to a fixed point on, for instance, a dock wall, or again one end of the rope may be attached to a fixed point within a warehouse and passes over a pulley on a bracket extending from 1 the warehouse wall.

The invention is more particularly described with reference to the accompanying drawings, in

which- Figure l is a side sectional one form of construction,

elevation showing Figure 2 is a similar view of a modified form of construction,

Figure 3 is a detail. 1

A rope I is passed from a bollard 2 on the dock wall 3 over a guide piece 4 at the end of a bracket or yard arm 5 extending from a mastfi, this rope I then forming a bight or loop I from which is suspended a hook or carriage 8 supporting a grab, a skip such as 9, or other load, to be raised from the hold I of a ship and to be deposited on the dock wall 3 .at a higher level. The rope I from its bight or loop I passes over a pulley I I on the mast 6 at a higher level than the guide 4, and thence down to any convenient place, so that it can be hauled in by hand or power winch l2. 1

The bollard 2 may be adjustable in position, so that the load will be deposited at any desired place along the dock wall by hauling on the free end I3 of the rope I by means of the winch I2, or by hand, thus raising the load 9 until the carriage 8 slips over the guide 4 and descends that part of the rope I lying between this guide and the bollard 2, by gravity. For instance, instead of the bollard 2, the outer end I4 of the rope could be attached to a fixed point on a movable carriage or a lorry.

.To allow the load to be disposed not only at any desired distance laterally of the boat I0 moored alongside the dock wall 3, but also longitudinally thereof, the yard arm may be mounted on vertical trunnions on the mast 6 or like support. Further, the rope may either be cleated or otherwise attached rigidly to the guide 4, or it may pass over a roller thereon.

It would be preferred to suspend a weight I5 on the bight or loop 'I of the rope additional to the carriage 8 for the load sufficient to return the bight or loop of rope to the position shown in Figure 1, so that a fresh load can be picked up.

This weight I5 is preferably mounted to run on the rope by means of a loop sothat it cannot pass beyond the guide 4, when the carriage 8 with load 9 passes beyond the guide and down the rope I.

The carriage 8 may consist either of an open hook enabling the load 9 to be rapidly attached to the rope on one side and to enable it to slide over the side of the guide 4, or it may comprise a single or double wheeled carriage open on one side.

The device is equally applicable to the unload ing of goods from a vehicle such as I6, Figure 2, to a warehouse where the pulley II will be'disposed from a bracket on the warehouse wall I1, which also supports the guide 4. It will be seen 1 in this case also that haulage on the end I3 of the rope I, passing over the guide pulleys II and I8, will cause an automatic unloading of the load 9 to any desired place along the warehouse fioor 20.

Where the load is raised by power, it will be 7 desirable to provide automatic means to declutch the drive to the haulage rope I as the load reaches the shoe or guide 4. Where the motor is electric, this may for instance be effected by a knock-off switch operated by the carriage 8, or by the counterweight I5, or again by the bight I in the rope becoming straightened and taut, or it may be by means of an automatic throw-out for a switch or for a clutch between the motor and its drive, as for instance shown in Figure 3, in which the end I3 of the haulage rope is passed over a pulley 2| carried by arms 22 mounted on the axle of the haulage winch 23 and provided with a cam, so that when the pulley 2 i is raised from the position shown by extra tension coming on the rope I3, the cam on the end 24 of the arms 22 will throw out the clutch to the driving motor 25.

Obviously the roller 2I must be heavier than the load consisting of the skip 9 with its load and counterweight I5, or, where a pulley system is interposed between this load and the winch, forming a mechanical advantage in such ratio as to be effectively heavier. Where loads of difsaid guide block, means to secure the free end 10 of the rope at a point horizontally beneath the said guide block, a carriage for a load engaging around the rope on one side only, so that when the bight of the rope is reduced in length by means of the winch the carriage passes the guide block and runs down to the free end of the rope, and a weight engaging wholly around the rope in the bight of the rope between said pulley and said guide block.

' JOSEPH *MELLING.

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