US1461800A - Hoisting and luffing mechanism for cranes - Google Patents

Description

July 1.7, 1923. L46L80 R. s. LEWIS HOISTING AND LUFFING MECHANISM FOR cmmss Filed net. 2, 1922 2,Sheets-Sheet 1 Q j Q I 5x I I k 0 w i Q lifzr s.

July 17, 1923. 1,461,800

R. S. LEWIS HOISTING AND LUFFING MECHANISM FOR CRANES Filed Oct. 2, 1922 2 Sheets-Sheet 2 @MXW- jays.

$M & BEER "LIMITED, OF IPSWICH, ENGLAND, A CQMEA.

HOIS'E'ING LUFFING EKECHANISM F0 CR.

Application filed October a, 11.922 Serial Ito. semis.

To all whom it may concern:

it known that I, Bonner STANLEY I LEWIS, a subject of the King of England,

til

bers are arranged coaxial and residin at Ipswich, Suilolk, in England. have invented certain new and useful Improvements in Hoisting and Lufing Mechanism for Cranes, of which the following is a specification.

This invention relates to cranes of the kind in which mechanisms for hoisting the load and lufling the jib can be so coupled to a single source of power as to be driven either alone or simultaneously, a brake holding that mechanism not in use against movement.

The object of the invention is to provide a compact and light mechanism b means of which the crane can be controlle in a simple manner, as is particularly desirable when the crane is of the locomotive or travelling ty e.

According to this invention the driven member or members normally engage a stationary brake and this brake is released automatically when the two parts of a friction clutch carried respectively by the driven and driving members are brought into engagement. Preferably the construction is such that when axial movement in one direction is imparted to the driving member or to a clutch carried thereby,'the two clutch members on the driving and driven members are gradually and progressively coupled together while simultaneously the driven member gradually disengages its stationary braking surface. Converse y axial movement in the opposite direction two halves of the c utch and simultaneously applies the brake in a gradual or progressive manner.

To this end the driving and driven memy with one another and in the preferred construction the driving member is disposed centrally between two driven members each of which carries a combined clutch and brake member adapted respectively to engage a clutch part carried by or rotating with the driving member and a stationary brake cone surrounding the driven shaft. The two driven members are respectively geared to a hoisting barrel or winding barrel and preferably all the clutch and brake mechanism is enclosed in a suitable casing from which project only the driving pinions and the sprmgs tending to mainmember A, clutch members an gradually disengages the tain the driven members in their brakes.

In the accompanyin drawings Figure 1 is a centrafi sectional elevation through the driving and driven members showing the hoisting and luiling barrels and their driving pinions, and

Figure 2 is a plan, on a reduced scale. In the construction illustrated a driving member com rising a worm wheel A keye to a sleeve is mounted to rotate upon a fixed shaft B the ends of which are supported in suitable standards C. The worm wheel A is engaged by a worm D driven by an electric motor indicated at C Figure 2 connected to the casing C containin the driving d brake memengagement with bers hereinafter described.

Formed within and preferably integral with the casing C are vertical partitions C bored to form supporting bearin s for the driving member A. The vertical members C-' also support fixed cams E which are drilled so as to clear the driving sleeve A. Surrounding the cam-faces on the members E are annular bearing members E in which cam-shaped bosses F are mounted to rotate, these bosses bein adapted to co-operate with the cams E and eing provided with operat ing levers F extending through slots C in the top of the casing C Mounted on each end of the driving sleeve A is an externally coned friction clutch member Gr, capable of axial movement upon the sleeve but keyed to the sleeve so as to rotate therewith. Each clutch member G'is normally forced towards the worm wheel A by means of a spring'G', but by rotating the cams F by means of their operatin levers F, axial movement may be imparte to the clutch members owing to the co-operation between the inclined faces of the rotary cams F and fixed cams E, 4

Near each end of the shaft B isia driveii member which can rotate and also slide, in an axial direction upon theshaft. One driven wheel A by means of their respective spiral springs H, J.

' and K secured to the casin The clutch members G, J4 are so arranged with relation to the fixed brake memversa.

bers K, K and externally coned movable brake members H, J 5 that if the clutches are engaged the brakes are released and vice In Fi re 1 the derrick barrel J 2 is shown as hel against rotation, the brake J 5 of the driven member J being in engagement with its fixed brakin cone K under the action of the spring a and the clutch G bein held out of engagement with the interna ly coned clutch member J by means of the clutch spring G.

On the other hand, the driven memb'er H is shown as having been moved axially away from the driving member against the action of its spring H through'the rotation of the cam F relatively to the fixedcam E. As a result the clutch H has been engaged by the clutch G and the brake H has been moved out of engagement with the fixed brake cone K so that the hoisting 'barrel H will be rotated. r

The pinions H, J are in constant mesh with the wheels on their res 'ective barrels and when the cam levers either to engage or disconnect the clutch members H, J these clutches will operate in a gradual or ro essive manner, the respective brake 5 being applied or released in proportion to the extent of engagement between the two parts of the 'corresponding clutch. V

In the drawings certain features forming no part of the invention are omitted to prevent confusion and the hoisting and derrick barrels are shown only in outline.

It is to be understood that the constructional details may vary considerably without departing from this invention, and that although a barrel has been shown for varying the inclination of the derrick if desired some other known means may be employed as, for example a screwthreaded shaft controlled by the clutch and brake mechanism already described.

What Iclaim as m invention and desire Letters atent is 1. In hoisting and lufling mechanism for cranes the combination of a driving member, driven members coaxial therewith on either side thereof, a lufling mechanism geared to one of the driven members, a oisting mechanlsm geared to the other driven member, a clutch member on each driven member, corresponding clutch members on the driving member, a brake member on each dr1ven member, a stationary are moved,

hoisting mechanism geared to the other driven member, a stationary brake surface for each driven member, va clutch member for each driven member on the driving member, a combined brake and clutch memher on each driven member, means tending normally to maintain said combined members out of engagement with their respective driving clutch and in engagement with their stationary brake surfaces, and means for imparting axial movement to the driving clutch members to couple the driving and driven members and simultaneously disen .gage the corresponding brake members.

3. In hoisting and lufling mechanism for cranes the combination of a driving member, driven members coaxial therewith on either side thereof, a lufling mechanism geared to one of the driven members, a hoisting mechanism geared to the other driven member, a

stationary brake surface for each driven,

member, avconical clutch member for each driven member mounted to slide upon the driving member, a correspondingly coned clutch member on each driven member, a brake surface on each driven clutch member, means tending normally to maintain said brake surfaces in contact with their respective stationary brake surfaces,,and independently operated means for sliding the driving clutches into engagement with their corresponding driven clutch members whereby these clutches are progressively coupled and the corresponding brake members are simultaneously released, axial movement in the opposite direction disengaging the clutch members and simultaneously applying the brake.

4. In hoisting and lufiing mechanism for cranes the combination of a driving member, an axially movable driven member mounted torotate on either side thereof and coaxial therewith, hoisting and lufiing mechanism respectively geared to said driven members, a combined clutch and brake member carried by each driven member, a stationary brake cone normally engaged by the brake portion of each driven member, friction clutches for each driven member mounted to slide upon the driving member and independently operated cams for slidin the driving clutches into engagement wit their corresponding driven clutch members, each clutch being thus progressively cou- Ill pled and simultaneously the corresponding driven member being moved in an axial direction so that its brake members are caused to disengage in a correspondingly progressive manner, axial movement in the opposite direction disengaging the two parts of the clutch and simultaneously applying the corresponding brake in a progressive manner. a

5. In hoisting and lufiing mechanism for cranes the combination of adriving member an axially movable driven member mounted to rotate on either side thereof and coaxial therewith, hoistin and lufiing mechanism respectivel care to said driven members, a coned friction clutch member and a braking cone forming part of each driven'memher, a stationary brake cone for each of said ment with their respective stationary brake cones, sprin tending normally to maintain said bra e members 1n enga cones, a friction clutch for each driven member mounted to rotate with. the driving member and adapted to slide in an axial direction relatively to the driven member, cams rotatably mounted on the driven memher, and independently operated means for rotating said cams to impart axial movementto the driving clutches and thereb to the driven members in opposition to t eir controlling s rings, whereby the two parts of the clutc are caused to engage and simultaneously the corresponding brake membersare disengaged in a gradual manner, rotation of the cam in the opposite direction permitting the controlling s ring to disconnect the clutch members an simultaneously apply the brake in a gradual and. progressive manner.

In testimony whereof I have signed my name to this s ecification.

ROB RT STANLEY LEWIS.

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