US1551072A - Hoist - Google Patents

Description

Aug. 25, 1925.

J. C. STINE HOIST Filed Dec; 31. 1921 2 Shoets-Shut 1 INVENTOR Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

JOSEPH C. STINE, OF TYRONE, PENNSYLVANIA.

HOIST.

Application led December 31, 1921.

To all whom t may concern:

Be it known that I, JOSEPH C. STINE, a citizen of the United States, residing at Tyrone, in the county of Blair and State of Pennsylvania., have invented a new and useful ImprovementI in Hoists, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is av perspective view of a hoist embodying the present invention;

Figure 2 is a side elevation of the construction illustrated in Figure 1;

Figure 3 is a transverse sectional view in a vert-ical plane thro-ugh the drum and its associated parts;

Figure 4 is a detail sectional view illustrating one of the clutch members;

Figure 5 is a detail view of the clutch operating cams; and

Figure 6 is a perspective view of o-ne of the cams illustrated in Figure 5.

The present invention relates broadly to hoisting apparatus and more particularly to portable drum hoists. Due to the fact that hoists of vthis character are moved about from place to place as required, it is desirable to have. the same as light as possible. At the same time, due to the hard usage to which the hoists are subjected, it is essential to have the-m strong enough to successfully withstand such usage. Not only are strength and lightness important features, but they must both be present in a compact structure which is easily handled and transported. The present hoist is designed with particular reference to all of these features.

It has been found by actual experience that where a friction clutch is utilized fo-r driving the rope drum the friction surfaces become worn more o-r less rapidly, thereby making it necessary to continuously apply new friction material. The present invention provides an adjustment by means of which a .compensation may be effected as the friction surfaces of the clutch members become worn.

A preferred form of my invention is disclosed in the accompanying drawings, which are illustrative only, and which are not to be construed in a limiting sense. As shown in the drawings, my improved hoist may comprise a bed plate 2, preferably in the Serial No. 526,097.

form of a casting, and having the main body portion thereof comparatively thin to conserve weight. The thin body portion is reinforced by an upstanding peripheral flange 3 which is preferably :continuous with the exception. of a short space 4 at one end of the plate. Adjacent this end of the plate and extending {transversely thereof, are neinforcing ribs 5 having a length substantially equal to the length o-f the spa-ce 4. These ribs to a lange extent compensate for the absence of the flange at this portion of the plate, and provide the necessary strength.

r1`he space 4 provided at one end of the bed plate makes it comparatively easy to slide into position an electric motor 6 having a base 7 dimensioned to be secured to the ribs 5. A control box C of any well known construction may be provided for controlling the operation of the motor. The armature shaft 8 of the motor preferably extends transversely of the bed plate and is provided at o-ne end with a driving pinion 9 of coinparatively small diameter, adapted to mesh with a gear 10 of considerably larger dia-v meter. lf he gear 1() is operatively secured to one end of a jack shaft 11, also extending transversely of the bed plate, and journalled in any desired manner in bearings 12, carried by vertical projections 13 of the fiange 3. Adjacent its opposite end, the shaft 11 is provided with a reducing pinion 1-1 meshing with a gear 15 loosely carried by a drum shaft 16. The drum shaft 16 is preferably non-rotatably secured in any desired manner in vertical projections 17 of the flange 3. rlhe projections 13 and 17 are connected by a reinforcing web 18 providing a maximum strength, these projections preferably being hollow, as clearly shown in Figure 3, for the purpose of conserving weight.

The gear 15 is provided with a portion 19 constituting one member of a friction clutch of the cone type. Also loosely carried by the drum Shaft 16 iS a. drum 2O having one of its heads provided with a portion 21, preferably provided on one Side with friction material 22, and constituting the second member of a cone clutch. These members are normally urged apart to maintain the same in disengaged position by a compression spring 23. For moving the drum 20 in opposition to the action of the comp-ression spring 23 for eifecting engagement of the clutch members, the drum Shaft may be provided with a fixed cam 24, as clearly shown in Figures 5 and 6, preferably having two similar cam faces 25. Cooperating with the cam 24 is a second cam 26 loosely mounted on the shaft 16 and movable longitudinally thereof. The cam 26 is provided with cam surfaces adapted to cooperate with the cam surfaces 25, whereby a relative rotational movement between the cam members will produce a longitudinal movement of the member 26. This movement is in turn transmitted to the drum 2O for engaging the clutch members by suitable disks 27. For rotating the member 26, it is preferably provided with a gear 28 which may have a relatively narrow face and which meshes with a pinion 29 preferably having a face of relatively greater width. The pinion 29 is operatively secured in any desired manner to a stub shaft 30 extending through one of the projections 17. This shaft has operatively secured to its opposite end a disk 3l having formed in its periphery a plurality of radially extending openings 32. Cooperating with the disk 31 is an operating lever 33 preferably loosely mounted on the shaft 30 and provided with means, such as a bolt 34 by means of which the lever 33 may be operatively secured to the disk 31 by engagement of the bolt with any of the openings 32. The openings 32 provide means for adjnsting the position of the lever 33 as the friction material 22 becomes worn, thereby enabling a positive driving engagement to be effected at all times by a predetermined movement of the lever 33.

For stopping rotation of the drum 20 after the clutch members have been disengaged, the portion 2l formed on one of its heads may have its outer surface machined to constitute a brake drum. Cooperating with this surface is a brake band 35 having one end secured to the bed plate n any desired manner and having its opposite end operatively secured to the short end of a bell crank lever 36. The long end of the bell crank lever may be provided with a foot treadle 37, by means of which it may be operated against the action of a tension spring 38 for 'applying the brake. As illustrated in Figure 3, the bed plate is provided with lugs 39 adapted to receive the pin 40 for holding the fixed end of the brake band.

The short end of the operating bell crank lever may be bifurcated, as shown in Figure l, and secured in any desired manner to a shaft 41 extending transversely of the bed plate and carrying at its opposite end the long arm of the bell crank lever.

In order to prevent undesirable reverse rotation of the drum 20, one of its heads may be provided with ratchet teeth 42 adapted to be engaged by a pawl 43 pivotally carried by the bed plate for operation by a handle 44.

From the foregoing description, it will be apparent that the motor control box, the brake lever, the clutch operating lever, and the lever for the pawl 43, are all located on one side of the hoist. This permits the same to be easily manipulated by an operator as required.

rfhe construction herein disclosed provides a hoist which is very compact while possessing the necessary strength combined with a minimum weight. These advantageous features make the hoist admirably adapted for use by contractors in connection with work requiring the constant transporting of the hoist from place to place.

l claim:

In a hoist, a bed plate having a reinforcing flange extending upwardly therefrom at its edges around all sides except one, all corners and a portion of the other side, there being an open space at one end of the plate between the ends of the reinforcing flange, two reinforcing ribs in the plane of the open space extending above the plane of the bed plate and substantially co-extensive with the length of said space, one of said ribs being adjacent to said open space while the other is spaced therefrom, a motor having/a base of less width than the length of the open space seated on the last two mentioned reinforcing ribs, and a pair of upwardly extending bearing standards on each side of the bed plate forming continuations of said first mentioned flange.

In testimony whereof I have hereunto set my hand.

JOSEPH C. STINE.

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