US1529397A - Shoveling machine - Google Patents

Description

March 10, 1925- P. BURKE SHOVBLING MACHINE Filed Fat-1. 27

. 1924 2 Sheets-Sheet 1 March 10, 1925 P. BURKE SHOVELING MACHINE Filed Feb. 27

1924 2 Sheets-Sheet 2 I DMdMO' Y EMA @0 weags v Patented Mar. 10, 1925.

UNITED STATES PATENT ()FICE.

PAUL BURKE, OF GREEN BAY, WISCONSIN, ASSIGNOR T NORTHWEST ENGINEERING COMPANY, OF GREEN BAY, WISCONSIN, A CORPORATION OF WISCONSIN.

SHOVELING MACHINE.

Application filed February 27, 1924. Serial No. 695,480.

To all whom it may concern:

Be it known that I, PAUL BURKE, a citizen of the United States of America, and resident of Green Bay, in the county of Brown and State of Visconsin, have invented new and useful Improvements in -Shoveling Machines, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to shoveling machines.

In shoveling machines in which the dipper and its handle or stick are mounted to swing and shift relative to its supporting boom, it is sometimes necessai and highl desirable to hoist the dipper W en the stic is in an extended position so that the contents of the dipper may be deposited at the desired point. In machines of this general type a dipper stick of reasonable length can' bethrust out when about in horizontal position, but hoisting from then on will gradually retract the dipper and stick until finally the sheave associated with the dipper meets the sheave at the outer end of the boom so that some means are necessary to hold the stick in extended position. It has heretofore been quite common practice in some designs of shovels of this general type to use a brake controlled by the operator, either by hand or by foot, to prevent the retraction of the extended stick, but such constructions put an additional duty,on the operator and complicate the control mechanism. The object of this invention is to provlde automatically operating means whereby the stick once thrust out at or near its limit is prevented from moving inwardly during hoisting, such means operating without complicating the control, as by additional levers, and without adding to the duties of the operator. I

A further object of the invention is to provide means whereby dipper sticks sub stantially longer than the distance between the shipper shaft and the point of the boom may be successfully hoisted in the extended position without complicating the controls.

A further object, of the invention is to associate an automatic brake with the dipper-operating mechanism so that the brake is automatically released or stays released during the outward movement of the stick; is automatically applied when forces, other than the retracting means proper, are acting to shift the stick inward; and is automatically released when the stick is retracted.

A further and more particular object of the invention is to provide a shovel of the rope-thrusting type in which the tension of the inward thrusting line is utilized to effect the release of an automatic brake so arranged as to restrain inward translation of the stick except when such tension is applied.

The invention further consist in the several features hereinafter set forth and more particularly defined by. claims at the conclusion hereof.

In the-drawings: Fig. l is a side elevation View of an excavating shovel embodying the invention; Fig. 2 is a detailsectional view on the line 22 of Fig. 1; Fig. 3 is a detail sectional View on the line 33 of Fig. 1; Fig. 4 is a plan view of the shovel, parts being shown in section.

In the drawings the numeral 5 designates the boom, which may be of any suitable construction, vertically pivotally attached at its lower end to the rotating base 6 of the machine, which base is of well known construction. A'hoisting drum 7 and an auxiliary drum 8 are mounted on the base 6 in any. suitable manner and driven from the prime mover (not shown) on the base. The drums 7 and 8 may be of any well known construction equipped with clutches and brakes to control their operation. The boom is adapted to be raised and lowered and held in various positions of vertical adjustment by any well known means, such as cables 9 connecting pulleys 10 at the outer 'end of the boom to parts on the rotating base. The boom shown is of the plate girder type with the dipper handle 11 working between its sides.

A shipper shaft 12 is secured in a support 13 on the boom and the saddle blocks 14 are loose .on said shaft. The dipper handle shown is made in two sections and each section has a metal facing 15 which slides in between the parts forming the saddleblock. A drum or sheave l6 and sheaves 17 and 18 are loose on said shaft and preferably disposed between the inner parts of the saddle blocks. The dipper or shovel 19 may be'ot' any suitable construction and is mounted, as usual, at the lower end of the dipper handle.

A hoisting cable 20 dead-ended on the end of the dipper stick'or handle 11.

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drum 7 passes therefrom over a sheave 21 on a shaft 22 at the outer end of the boom, then around a transversely disposed padlock sheave 23 pivotally mounted on the dipper and around the larger part of a compound drum 24 on which it is dead-ended. A cable 25 is dead-ended on the small side 26 of the compound drum 24 and passes one or more times around the drum 16 on the shaft 12 and is dead-ended at 27 near the uppeAr cable 28 secured to and wound upon the drum 8 passes over the sheave 17 on the shaft 12, thence over a sheave 29 on the lower end of the dipper stick and thence over the sheave 16 on the shaft 12 and to a brakeoperating means hereinafter described which acts as an anchorage for said cable.

With the construction above described, when the drum 8-is prevented from turning by its brake, thereb holding the line or cable 28, and the line 20 is pulled in, the dipper moves approximately in the arc of a circle of which the shipper shaft is the center. If it is desired to crowd into the material being excavated, or to move the dipper farther out, as in loading a wagon, braking effect on line 28 is released slightly, allowing the line '20, pulling on the large side Of (ll'l1lIl 24, to put a pull, here greater than hoisting effect because of the compound drum, on line 25 which theeupon forces the dipper stick outward. Conversely, if it is desired to move the dipper farther in, hoisting with line 28 produces this effect. While the-"compound or difl'erential drum is preferred, it is to be understood that the invention is not to belimited the eto unless specificaily mentioned. Thus, by a proper manipulation of the lines 28 and 20 any desired swinging and thrusting movement of the dipper and its stick may beeffected. Furthermore, since the line 25 which effects the thrust is'actuated by the hoist, a crowding effect equal to the full driving force of the engine is secured. With this and other constructions, however, when the stick is in an extended position and hoisting has been continued until the stick is 'approachin at, or above the horizontal position, the oisting cable 20 and other forces, such as the weight of the-dipper and its contents, tends to shift the stick inwardly. Y

.To restrain the inward shifting movement of the dipper handle, I form a part of the drum 24 as a brake drum 30 adapted to be engaged by a brake-band 31. One end 31 of this band is adjustably secured to one arm of a bell crank lever 32 loose ona shaft 33 fixed on the boom and at a greater. distance from the center of said shaft than the point at which the other end of the band is secured to the other arm of said bell crank lever thereby providing an automatic brake which, when the drum 24 rotates in a clockwise direction, as in outward shifting of the dipper handle, acts to automatically release' said band and in a counterclockwise direction'it acts to tighten said band about the drum 30. An arm 34 is also formed as a part of the lever 32 and a spring 35, secured at one end to said arm and at its other end to the boom, acts to put an initial tension in said band. As the inward shifting tendency of the stick when in an extended position acts through the cable 25 to rotate the .drum 24'ina counterclockwise direction, it will be noted that under these conditions the restraining torque of the brake is applied directly to the compound drum 24 and is transmitted through the cable 25 to the dipper handle to hold the same.

In order to release the automatic brake when it is desired to shift the dipper handle inwardly, the retracting cable 28 is secured at its outer end to a lever 36 pivotally mounted intermediate its ends on the support 13 and pivotally connected at its other end to one end of a'reach rod or link 36' which is pivotally connected at itsother endto the arm 34, whereby the tension produced by the inward pull of the cable 28 will, through the lever 36, link 36 and arm 34, shift said bell crank lever 32 so that its longer arm swings toward the shaft 22 and thereby releases the brake so that the brake is automatically released incident to the operator shifting the dipper stick inwardly and hence no additional control mechanism has to be operated by the operator. A stop 37 limits the swing of the lever 36 on release.

From the foregoing description it will be noted that I have provided means which automatically restrains the dipper stick from moving inwardly when it is desired to hold the dipper stick extended, but which permits the dipper stick to be moved outwardly for the digging operations, and which automatically releases without any special operation on the part of the operator when it is.

desired to retract the stick. 7

I desire it to be understood that this invention is not to be limited to any specific form or arrangement of parts except in so far as such limitations are included in the claims.

What I claim as my invention is:

1. In a power shovel, the combination of a boom, a dipper and dipper handle mounted thereon for swinging and shifting movements, meansincluding a thrust cable for shifting said handle outwardly, a dipperhoisting cable, a drum having-portions of different diameters connected respectively with said hoisting cable and said thrnst cable whereby the working tension in said hoisting cable is utilized to shift said dipper handle, a brake for said drum to hold it against turning movement in a direction preventing inward shifting movement of said dipper handle, means for shifting said dippenhandle inwardly, and means 0 erated by said 1nward shifting means to re case said brake.

2. In a power shovel, the combmation of a boom, a dipper and dipper handle mounted thereon for swinging and shifting movements, means including a thrust cable for shifting said handle in one direction, means including a thrust cable for shifting said handle in another direction, a dipper-holsting cable, a drum having portions of dlfierent diameters connecte respectively with said hoistin -cable and one of said thrust cables where y the working tension in said hoisting cable is utilized to shift said dipper handle, a brake associated with said drum to hold it against turnin movement in one direction to prevent shi ing movement of the stick in that direction, and means operatively connected. with .one of said thrust cables and controlled thereby for releasing said brake.

3. In a power shovel, the combination of a boom, a compound drum mounted thereon, a di par and dipper handle mounted on said boom forswmging and shifting movements, a dipper-hoisting cable connected with the larger part of said drum, a second cable connected with the smaller partof said drum and o eratively connected with the dipper handle to shift said handle out! wardly, means including a third cable 0 era-- tively connected with said dipper hand e forshifting said handle inwardly, a brake for said drum to. hold it against rotation in one direction to prevent inward shifting movement of said handle, and means operatively connected with said third cable and con trolled thereby for releasing said holding means. I

4. In' an excavating machine, the combination with a boom, of a dipper and dipper handle mounted thereon to swing and shift with respect thereto, means for hoisting said dipper and thrusting it outwardly including a rum at the outer end portion of the boom, an automatic brake for restraining said drum-against turning movement in one direction to thereby prevent inward shifting movement of the dip er handle, means for shifting the di per handle inwardly, and means operated y said shifting means to release said brake.

5. In an excavating machine, the combination with a boom, of a dipper and di per handle mounted thereon swing and ift thereby prevent inward shiftin with res ct thereto, a drum 'on the outer end portion of the boom, di per-hoisting and 6. In an excavating machine, the combina tion with a boom, of a dipper and dipper handle mounted thereon to swing and shift with respect thereto, means for hoisting said dipper and thrusting it outwardly including a drum at the outer end portion of the boom, a brake on said drum wherebyto restrain its turning movement in one direction and movement of the dipper handle, a shaft a iacent said handle, sheaves on said shaft, a sheave on the lower end ortion of the dipper handle, brake-1e easing means, and a retracting cable passing over one of said sheaves on said shaft, around the sheave on said dip er handle, over the other sheave on saidsha and dead-ended on said brake- .releasing means whereby said releasing means operates to release said brake when said cable is actuated to retract said handle.

7 In an excavating machine, the combinationof a boom, a compound drum mounted on the outer end portion thereof, a h pper shaft, a dip er and dipper handle mounted on said shaft to swing and shift relative to the boom, 9. dipper-hoisting cable connected with the larger part of said drum, a second 1 cable connected with the smaller part-of said drum and ofiaeratively connected with the dipper han eto shift said handle outwardly, a brake operating on said drum to restrain its turning movement and thereby prevent inward shifting movement of the dipper handle, brake-releasing means, s aced sheaves on said shaft, a sheave on t e lower end portion of the dipper handle, a third cable passing over one of said sheaves on said shaft, over the sheave on said handle and over the other sheave on said shaft and dead-ended on said brake-releasing means whereby said releasing-means o crates to'release said brake when said cab e is actuated to retract saidhandle.

In testimony whereof I afiix my signature.

PAUL BURKE.

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