US1536608A - Power shovel - Google Patents

Description

.May 5, 1925.

. P. BURKE POWER SHOVEL Original Filed May 26, 1924 2 Sheets=heet 1 INVENTOR. 02 M r ATTORNEYS Patented May 5, 1925.

PAUL BURKE, OF GREEN BAY, WISCONSIN, ASSIGNOR TO ORTHWEST ENGINEERING COMPANY, OF GREEN BAY, WISCONSIN, A. CORPORATION OF WISCONSIN.

POWER SHOVEL.

Original application filed May 26, 1924, SeriaI'No. 716,000. Divided and this application filed I i'ebruary T (ill whom zamag concern Be it known that I, PAUL Binnie, a citizen of the United States of America, and res dent of Green Bay, in the county of Brown and State of lV-isconsin, have invented new and useful Improvements in Power Shovels, 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 excavating machines.-

In some types of power shovels, usingone source of power for both hoisting and thrusting,- provision is made for positively thrusting the dipper and its handle outwardly, as by a gear drive or a separate cable, without any cooperative association therewith by the hoisting cable, which is a separate unit.

, Vihile such mechanisms permit positive out- 'ward thrust of the handle, regardless of its position relative to the boom :and allow thrusting out to the extreme position, it is to benoted that whatever power is-devoted to thrusting effort will involve a simultaneous andicorrespond-ing reduction in the pow er then available for hoisting; that'isto say,

assume a dipper lowered onto the material to be excavated,-and being moved through the material, theresistance encountered be--- i ing such as to take nearly all the power of the engine, no thrustingtaking place, the dipper moving in substantially the arc of .a circle; when, as is usually the case, 1t beco'ineshecessary to thrust further into the bank power must be subtracted from hoisting, which results in a corresponding reduction in the force at the dipper lip and teeth for cutting through the matcriaii. This means a reduction in the size of the bite must i be made, or perhaps the dipper will have to be returned part way to the starting point anda new bite started because of the de mandsupon the power plant which, as a practical matter, 13. generally not provided I with excess power. 'This naturally slows up the digging operation and produces poor and unsatisfactoryoperation where the digging conditions are difiicult.

With that type of 'rope thrusting shovel in which thrusting is obtained by or in com ncction with the hoisting cable andthe tcnsion available for hoisting is not reduced while such thrusting act-ion is taking place, the single power plant need not be overpow- 54 and-meshesa gear'oO. Amaanber.

Serial No. 7,973.

cred since the thrusting effort or the restraining effort from outward motion of the stick occasions no reduction itmtlieenetdigging effort and the energy balance is main tained, but with such construction as now known, where the stick is long, it usually cannot be projected beyond the boom when above the horizontal for dumping,- because forces due to the weight of the bucket and the inward thrust exerted by said hoisting cable prevent this. Furthermore, with such constructions a rapid longitudinal. shaking movement cannot be readily imparted to the stick and dipper; which motion is sometimes desirable for the purpose of dislodging a rock or other object with which the dipper and its teeth may be engaged during diggmg.

This application constitutes divisional subject niatterfrom that of my copending application Serial No. 716,000, filed May 26, 1924, and relates more particularly to that form of my invention in which positive outeral features hereinafter set forth and more particularly defined by claims at the conclu-. sion hereof. 1 In the drawings: F 1 is a side elevation .view of anex cavatin'g shovel embodying the invention; Fig. 2 -is a plan View of the shovel shown in Fig. 1, with the stick shown in section. In the drawings the numeral/i6 designates the-boom, which maybe of any suitable construction, vertically pivotally attached at its lower end to a rotating base 47 of the machine. which base is of well-known construction. The hoisting drum 48 is loosely mounted ona shaft 49 suitably su ported on the rotating base in any well known manner, and a gear 50 is keyed to said shaft and meshes with a drive pinion 51 ona shaft 52 which is. driven in any suitable manner from a I onthe rotating base. A memberrfiii, here shown in the form of a drum',= is loosely shaft 54 suitably-supported manner, and a prime mover, notflsho'wn,

' by the shaft 54 and with a suitable brake 64.

The drum 56 is equipped with aclutch 65, of an suitable construction, for connecting it to driven by the shaft 49. Thus, the drum 48 and the member 56 may bejin'dependently connected with the source of power through their clutches 61 and 65, and the member 53 may be driven in one direction when connected by the clutch 63 to the shaft 54, and in the opposite direction through the gearing connection 57, 58 and 66, it being noted that the clutch 65 may beassociated directly with'the member 53 and the gear 57 be made fast to the shaft 49 without changing the operation.

A shipper shaft 66 is journalled in bear-' ing brackets 67 on the boom and carries a pinion or gear68 meshing with a rack 69 affixed to the dipper handle or 'stick 70 which is slidably mounted in a yoke 71 mounted-to swing on and about'the-shipper Sheff 66. The dip'penor shovel 72- may be of any suitable construction and is'mounted, as usual, at the lower end of the stick. A hoisting .and outward-thrusting cable 73, wound around the; drum 48 and secured thereto, passes therefrom under a .guide sheave 74 on the bobm,thence over a sheave 75' loose on the shaft 76 at theouter end of the boom, thence downwardly through a transversely dispose'dpadlock sheave 77 pivjotally connected to the dipper, thence upwardly over a guide *sheave 78 loose on the shaft 76, thence balckwardly to. and around a drum 79 keyed toggthe shaft 66, and the end of said cable is dead-ended on said drum. The member, or drum 53 has a sprocket wheel '80 formed integral therewith or secured thereto, which is operatively connected to the sprocket wheel 81 keyed to the shaft 66 by a chain '82.

' The boom-is adapted to be raised or lowered and held in va-rious'positions ofvertical adjustment by well-known means, such as cables 83 connecting pulleys 84 to parts on the rotating base.-

With this last-described construction, it will be noted that when the drum 53 is prevented from rotating 'by its brake 64 and the clutch 65 is disengaged and the clutch 61 for the drum 48 is thrown in, thereby con neeting sa-id drum with the source of power to turn the same to pull in on the cable 73,

the dipper will swing approximatel in the arc of a circle of which the shipper shaft 66 is the center. The dipper having been drawn in toward the machine and lowered upon the material to be excavated, and with the brake 64 on member 53 released and with the drum 48 connected to the shaft 49- through the clutch 61, cable 73 is wound in, causing the dipper pivoted about the shaft- 66 to swingrelative thereto and at the same time, due to the tBIlSiQD-:-Plfi(lllflfid in said cable, causing the drum 79 to revolve in a clockwise direction and thus rotate the shaft" 56 and its pinion 68threugh =the rack 69 to move the dipper stick 70 lengthwise and outwardly, producing an outward thrusting of the dipper, thus crowdingit outwa'rdly ipto the material to be excavated.' If, durand hence causing additional power to beimparted tow 'the shaft 66 to increase the outward thrusting effect.

Furthermore, as the dipper under the action of the hoisting cable is swung upwardly beyond a substantially horizontal position,- the tendency of the dipper and its stick .to shift inwardly, due to the tension in the hoisting cable and the weight of the dipper and its stick, may be prevented- {bythe releasev of clutch 63 and the application of 'brake 64 to the shaft 53 to hold the gear 68 against turning, and by connecting the member 53with the source of power throu h r the clutch 63 and the gears 51, 50 and 55 t 1e positive outward thrust of the additional drive thus furnished will move thestick out-.

wardly against the forces tending to shift it inwardly, as previously mcntionedrso that the dipper will be moved to bring the padlock sheave -77 substantially beyond the point of the boom and the stick substan; tially above the horizontal. Thus, the drive from the-drum 53 assists in thrusting the stick outwardly during digging and in thrusting the stick outwardly during hoisting, or preventing its tendency to shift inwardly under the conditions above dc scribed. If it is desired to retract the (lip per or move it in toward the boom, throwing out clutches 61 and 63 and throwing in clutch 65 causes the drive fronrthe source of power through the gears 51, 50, 57, 58 and 60, member 53, sprockets 80, .81 and chain 82 to turn the shaft 66 in a counterclockwise directiomwhcreby the pinion acts on the rack to move the stick inward or upward relative to the boom.

From the foregoing description it. will be noted that I have provided a construction in which the dipper and its handle may be positively thrust outwardly or inwardly during digging and that the association of the twisting cable with the outward thrustmg means prevents loss of power due to thrusting,

l. 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 specified in the claims or necessitated by the prior art.

What 1 claim as my invention is:

l. in an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon to move lengthwise and swing with respect thereto, of means for moving the dipper and its handle lengthwise in both directions and inclui'ling a reversible member, and a dipperhoisting cable associated with said means for conjoint outward thrusting therewith during outward lengthwise movement of :id dipper and dipper handle,

2. in an excavating machine, the combi nation with a supporting boom, of a dipper and t'lippcr handle moiinted thereon to move h-uig'tlinise and swing with respect thereto, (:l' a reversible drive mechanism associated Vlill the dipper and its handle for moving thr same oiuwardly and inwardly, and a dippeuhoisting cable associated with said na-eiianism for conjoint outward thrusting therewith during digging.

25. in an excavating machine, the combination with a supporting boom, of a shipper shaft, a pinion on said shaft, a dipper and dipper handle mounted to move lengthwise and swing with respect to the boom and having a rack meshing with said pini n, means for driving said shipper shaft to move the dipper and its handle lengthwise in both directions, a drum on said shipper shait, and a dipper-hoisting cable associated with said drum for conjoint outward thrusting with said pinion during outward lengthwise mmiemeut of said dipper and dipper handle.

4, In an excavating machine, the combination with a supporting boom, of a shipper shaft, a pinion on said shaft, a dipper and dipper handle mounted to move length-- wise and swing with respect to the boom and having a rack meshing with said pinion. means for driving said shipper shaft to move the dipper and its handle lengthwise in both directions, and a dipper-hoisting cable also associated with said dipper and dipper handle for conjoint outward thrusting with said pinion during outward lengthwise movement of said dipper and dipper handle.

5. In an excavating machine, the combination with a supporting platform and a boom extending therefrom, of a dipper and dipper handle mounted on the boom to move lengthwise and swing with respect thereto, said dipper handle having a rack, a pinion mounted on the boom and meshing with said rack for moving the dipper and handle lengthwise in both directions, means mounted on said platform and operatively connected with said pinion for driving it in either direction, a dipper-hoisting cable as sociatcd with said pinion for conjoint out ward thrusting tlwrewith during outward lengthwise movement of said dipper and. dipper handle, and a hoisting drum for said hoisting cable mounted on said platform.

6. In an excavating machine, the combination with a supporting platform and a boom extending therefrom, of a dipper and dipper handle mounted on the boom to move lengthwise and swing with respectto the boom and having a rack, 21 shippershaft, a pinion on said shaft meshing with said rack, a sprocket wheel on said shaft, a shaft mounted on said platform and carry-- ing a sprocket wheel, a chain operativcly connecting "said sprocket wheels, reversible drive means for said last-named shaft whereby to move said dipper and dipper handle lengthwise in both directions, and a dippcr-hoisting cable also associated with said dipper and dipper handle for conjoint outward thrusting with said pinion during outward lengthwise movement of said dipper and dipper handle.

In testimony whereof, I affix my signature.

PAUL BURKE.

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