US1498557A - Hoisting gear - Google Patents

Description

June 24. 1924:. 1,498,557

A. LIARDET ET Al...

HOISTING GEAR Filed Sept/l3, 1922 JNvsxvTaR sf 5 W W Jim/V 7 W WLZZMUWM ATTY Patented June 24-, E924.

UNETEE" STATES treats? P AT AYLMER AUGUSTUS LIARDET, 0F BRADFORD, AND FREDERICK WILLIAM BERK, OF HARROGA'IE, ENGLAND.

HOISTING' GEAR.

Application filed September 13, 1922.

To all whom it may concern:

Be it known that we, AYLMER AUcUs'rUs LIARDET and F nnoniuck VVILLIAM BERK, subjects of the King of Great Britain and Ireland, residing at Vulcan Iron Works, Bradford, Yorkshire, England, and 22 Studley Road, Harrogate, Yorkshire, England, respectively, have invented new and useful Improvements in and Relating to Hoisting Gears, of which the following is a specification.

This invention relates to improvements in hoisting gear of that kind in which the Winding drum is operated through epicyclic or like gearing and in connection with which two brakes are used to manipulate the load and it is our object to arrange, construct and combine certain mechanism and gear operable by power whereby the load, load container or load supporter or like is lifted from one level to another and held in the lifted position. The load container or supporting device is allowed to'return by gravity without reversing the direction of the driving shaft. The brakes are operated by one lever which merely relieves the brakes and on release of the lever the brakes are automatically applied. In power operation, it is desired to avoid complications and permit the operating shaft to run constantly in one direction whatever the movement of the load, its container, or supporting device.

Broadly the machine comprises, a drum or drums in connection with which operate the hoisting ropes, wires or chains: a planet or other suitable epicyclic gear, and two brakes or brake members acting upon members of the epicyclic train or parts directly connected with such members all arranged so that by operation of the main or power shaft in one direction and the co-operation of the braking members to operate which only one lever is required and the brakes are automatically applied, the load or like will be first lifted, then held and finally allowed to return by gravity. The purposes to which the invention may be applied are many, such for example as crane work, charging machines for cupolas or the like.

We have previously designed and patented in Great Britain under Number 135358 means and apparatus relating to drop ham- Serial No. 587,923.

Fig. 1 represents a sectional elevation'of a power operated gear.

Fig. 2 represents an end view.

Fig. 3 represents a detail and connection to the control lever. i

For a power-driven apparatus as illustrated herein, A is a countershaft mounted for rotation in'bearings carried by standards B, said shaft being adapted to receive motion 7 from a power shaft A (Fig. 2) driven by a motor or other suitable means. If a motor is used the connections are simple and only one switch to put the motor into or out of action is required. The shaft A will carry a pinion A (or otherwise be arranged to transmit motion to the shaft A) gearing with a gear wheel A and on the shaft A will be mounted a disc or like D having a brake band D on or in connection with its rim D This disc will be mounted free to revolve on the shaft A and will carry on a pin D a gear wheel D which will mesh with teeth D on the disc D also mounted loosely on shaft A. The gear or planet wheel D will also mesh with a pinion D fast on shaft A. The'disc D will carry a brake D and the disc D will carry a pinion D which will engage a, gear wheel on a shaft D carrying the winding drum D.

The brake bands D and D will be arranged substantially as shown in Fig. 2 D being adjustably connected or anchored at one end F and at the other end F connected to a weight lever L pivoted at L. The other brake band D will be anchored as at F at one end and at'the other end be connected to alever or like F carried from what may be termed the operating shaft G. This shaft will also carry a rocking member G with rollers or like bearings against which the lever L will bear.

lln Fig. 2, the mechanism is shown in the middle or neutral position, the brake D being on and the brake D off. Now if the rocking. member G be moved clockwise the effect will be to lift the lever L and release the brake D The same movement will lower the lever F and apply the brake D If however the member is moved in the opposite direction, the lever L will still be lifted and the brake D released, but in this case the lever F will rise and further release the brake D The shaft G by links, levers, rods or the like will be arranged in, connection with a suitable operating handle H" Fig. 3. i i i The drum D will carry the hoisting chain, ropes or the like. To operate, the shaft A is rotated in one direction and by means of gearing such as before described transmits motion to the shaft A. and with the member G in the neutral position the disc D held, the pinion D? will merely transmit motion to the pinion D and through it to the disc D and no motion will be transmitted to the winding drum. If however the brake D be released by the movement of the shaft G and member G, say clock wise. the disc D will be held and the gear will cause the disc D to be rotated and communicate motion to the drum D and the hoisting operation will be carried on until the member G is returned to its neutral position.

In this position the shaft A will continue running and the bucket is held in its raised position by the brake D An anti-clockwise movement of the shaft G will merely insets? a driven shaft adapted to receive motion from said countershaft, a pair of brake drums loosely mounted on said countershatt, gearing. between one of said drums and said driven shaft for transmitting motion to the latter, epicyclic gearing between said countershatt and one of said drums for transmitting motion to the drum, the planet pinions of said epicyclic gearing being carried by the other drum, a brake band encircling each of said drums, a weighted lever automatically operative 1E0! retaining one of said brake bands in frictional contact with its drum thereby to retain the driven shaft against rotation, and a rock shaft adapted when rocked in one direction to operate said weighted lever thereby to release said brake band and simultaneously tighten the other brake band on its drum and when rocked in the opposite direction to release both of said brake bands thereby to permit rotation of the driven shaft independently of the countershaft.

In testimony whereof we have signed our names to this specification.

AYLMER AUGUSTUS LIARDET. FREDERICK WILLIAM SEEK.

Witness;

G. WAUGH.

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