US496942A - Hoisting-whim - Google Patents

Description

(No Model.)

0. A. LAWTON.

HQISTING WHIM. No. 496,942. Patented May 9, 1893.

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UNITED STATES PATENT OFFICE.

CLARENCE A. LAWTON, OF DENVER, COLORADO.

HOISTING-WHIM.

SPECIFICATION forming part of Letters Patent No. 496,942, dated May 9, 1893.

Application filed September 17, 1892. Serial No. 446,223. (No model.)

To all whom it may concern:

Be it known that I, CLARENCE A. LAWTON a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Hoisting- Whims; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in hoisting whims and the object of the invention is to provide a machine of the class stated which shall be simple in construction, economical in cost, reliable, durable and eificient in use.

To these ends the improvement consists of the features, arrangements and combinations hereinafter described and claimed and will be fully understood by reference to the accompanying drawings in which is illustrated an embodiment thereof.

In the drawings Figure 1 is a top or plan view of the mechanism. Fig. 2 is a side view of the whim shown partly in elevation and partly in section. Figs. 3 and 4 show two parts having oppositely disposed inclined faces which when the elements of the mechanism are assembled engage each other. Fig. 5 shows these inclined faces connected in operative relation. Fig. 6 is a fragmentary view illustrating the ratchet disk and the engaging dogs or pawls pivoted on the stationary arms of the framework.

Similar reference characters indicating corresponding parts or elements of the mechanism in the several views let the numeral 5 designate the framework in which is mounted the rotating drum 6, its shaft 7 being journaled in suitable boxes 8 secured to the frame. Near one extremity, shaft 7 is provided with a bevel pinion 9 carrying cogs or teeth 9. This pinion is made fast on the shaft and adapted to mesh with a gear wheel 10 carrying cogs or teeth 10. Gear 10 is loosely mounted on a vertical shaft 12 journaled in the framework and carrying the friction wheel or clutch 13 attached to the shaft by a feather or spline and therefore having a longitudinally sliding movement thereon. This friction wheel has a circumferentially recessed face carrying a wood filling 13 adapted to engage the loose gear wheel 10 and impart motion thereto when properly adjusted on the shaft. To the upper extremity of shaft 12 is made fast the disk 14 provided with ratchet teeth on its lower face and having the sweep 16 attached to its upper face. To lugs 17 of the stationary arms 17* are pivoted two pawls 18 having weighted arms 18". These pawls are adapted to engage the teeth of wheel 14 and lock the wheel in any desired position. It will be observed that the engaging extremity of only one pawl is illustrated in Fig. 2, though the weighted arm is seen on the opposite side. Sleeve 17 is made stationary on the frame by two arms 17 preferably formed integral therewith at one extremity, their free extremities being made fast to the framework in any suitable manner.

Friction wheel13 is provided with a collar 13 which engages a cap 20 surrounding the lower extremity of shaft 12. This cap slides freely upon its shaft and is provided at its lower extremity with a double inclined cam face adapted to engage a counter-part engaging cam face formed upon adisk 25, said disk being made fast to a short shaft 30 journaled in the frame and carrying a fast sheave wheel 40 at its lower extremity. Cap 20 with its engaging disk is surrounded by a stationary collar 35.

When it is desired to rotate drum 6 for hoisting purposes, sheave wheel 40 is turned, giving shaft 30 a partial rotation or turning the same sufficiently to raise cap 20 and force friction wheel 13 to engagement with gear wheel 10 by virtue of the mutual action of inclined engaging faces of parts 30 and 20. This engagement of the friction wheel with the gear Wheel 10 causes the collar to rotate and imparts motion to the drum through the medium of the bevel pinion 9. It will be observed that collar 20 carries a spline 20 which engages a corresponding groove formed in stationary collar 35, thus permitting the collar to slide but not rotate as disk 30 turns.

The sheave wheel 40 should be engaged by a cord or rope wherebyit may be turned and locked in any desired position until it is do sired to reverse the drum when it should be released permitting friction wheel 13 to move downward so that gear wheel 10 will no longer rotate. The friction wheel will not, however, entirely leave the gear wheel but will engage the same sufficiently for brake purposes. It will be observed that when the drum is performing the reverse or unwinding movement shaft 12 remains stationary while the loose gear wheel 10 turns thereon.

Having thus described my invention, what I claim is- The combination with the rotating drum and the pinion made fast to its shaft 7, of a power shaft 12 carrying a loose gear engaging the pinion on shaft 7, a friction wheel slidingly supported on shaft 12 but rotating therewith, a hollow cap engaging a collar formed on the friction wheel and adapted to receive the lower extremity of shaft 12, the cap being splined on the stationary frame and longitudinally movable on the shaft, its lower extremity carrying a cam-face, another shaft 30 carrying a counter-part cam-face adapted to engage the corresponding face of the cap, and means for rotating the last named cap whereby the friction wheel is raised or lowered, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CLARENCE A. LAWTON. WVitnesses:

WM. MoOoNNELL, G. J. ROLLANDET.

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