US2131133A

US2131133A - Hoisting device

Info

Publication number: US2131133A
Application number: US156225A
Authority: US
Inventors: Henry B Babson
Original assignee: Babson Brothers Co
Current assignee: Babson Brothers Co
Priority date: 1937-07-28
Filing date: 1937-07-28
Publication date: 1938-09-27
Anticipated expiration: 1955-09-27

Description

Sept. 27, 1938. H. B. BABSON} Y 2,131,133

-- HOISTING DEVICE Filed July 28, 1937 Patented Sept. 27, 1938 UNITED STATES,

HOIST'ING DEVICE Henry B. Babson, Chicago,

son Bros., a corporation Ill., assignor to Babof Illinois Application July 28, 1937, Serial No. 156,225

2 Claims.

This invention relates to a hoisting device and more particularly to a swingably mounted hoisting device suitable for lifting heavy articles into a conveyance.

The invention is illustrated in the drawing, in which Fig. 1 is a vertical elevation, partly in section, of the device, and Fig. 2 is a similar view of the device mounted at the rear end of the conveyance. Figure 3 is an elevation of the winch illustrating the wrapping of the rope thereabout.

In lifting heavy articles into trucks or other conveyances, it is desirable to have a pivotally mounted member carrying the weight, and at the same time it frequently becomes necessary to raise or lower the article being lifted, a short distance. It is inconvenient and often impossible to return to the main lifting device for this purpose.

In accordance with the present invention a device is provided which makes it easily possible to lower a weight by any desired distance simply by lifting a much smaller weight the same distance, and at the same time the weight will then be held at the adjusted position without further operation.

The device comprises a davit member I0 preferably of metal and hollow at its lower portion as indicated at H. The davit member is rotatably mounted at its base, for example in the collar I2, which may be mounted upon or adjacent to the rear platform l3 of a truck 14. Carried intermedially of the davit is a winch l5 provided with a lever handle [6 operating on the customary ratchet mechanism ll whereby the winch is held against movement in one direction. Near the outer end of the davit is a pulley l8 carried by the pintle l9 and the frame 20. Intermedially of the davit is a second pulley 2| carried by pintle 22 and frame 23. A flexible hoisting member such as a rope 24 passes over the pulley l8 several times, around the winch l5, over the pulley 2| and is fastened within the hollow portion of the davit to a weight 25. The loose end of the rope is of course attached to any suitable object to be lifted such as a carton or can of milk 26.

The weight 25 may be very light, only being sufficient in amount to maintain the rope 24 in tension upon the winch l5. For normal purposes a weight of 5 lbs. is ample in connection with the strength of rope ordinarily required to lift a can of milk weighing say lbs.

In operation of the devicethe rope is fastened to an object to be lifted, and the article is then lifted by operation of the hand lever l6 until the object has cleared the platform of the truck. The davit may then be swung inwardly and the weight lowered simply by pulling on the rope 24 at -the point marked 21' any desired distance. This operation removes the tension of the weight 25 from the winch and permits the rope to slip from the smooth winch, thereby lowering the object the same distance.

It is obvious that where the distance within the davit is not great enough to permit lifting of the weight the desired amount, a block and tackle arrangement may be employed to cut down the movement of the weight 25, but in such case the mass of the weight will have to be increased accordingly.

The weight 25 is in no sense a counter-weight, being sufficient only to hold the tension upon the winch l5. Ordinarily 3 or 4 turns of the rope about the winch will suifice.

Obviously any flexible member other than the ordinary vegetable fibre rope may be employed, but ordinary rope is preferred. Likewise the term pulley has been, used to cover similar slide members.

The foregoing description has been given for clearness-of understanding only, and no unnecessary limitations should be understood therefrom,

1 but the appended claims should be construed as broadly as permissible in view of the prior art.

What I claim as new, and desire to secure by Letters Patent is: I

1. In a lifting device, a winch, means for preventing movement of the winch in one direction, a rope wrapped about the winch a few turns and held thereon substantially solely by its frictional engagement therewith, one end of said rope being adapted to be attached to a relatively heavy object to be lifted, and the other end attached to a relatively small weight holding the rope in frictional engagement with the winch, the number of turns of rope upon the winch being large enough to maintain proper friction, and small enough that upon release of the small weight, the frictional engagement thereof will be released.

2. In a conveyance, a platform, a davit member rotatably mounted upon the platform having an elongated hollow portion, a pulley carried by 45 the davit near the outer end thereof, a winch associated with the davit, a small hand-movable weight within the hollow portion of the davit, a rope connected to the weight, wrapped several times about the winch and passing through the 50 pulley and adapted for attachment to a relatively large weight, and means for preventing movement of the winch in one direction.