US 3303587 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
Feb. 14, 1967 H. w. RocKwELL l EARTHMOVER V2 sheets-sheet 1 Filed March 6, 1954 Feb. 14, 1967 H. w. RocKwELl.
EARTHMOVER 2 Sheets-Sheet 2 Filed March 6, 1964 Patented Feb. 14, 1967 3,303,587 EARTHMOVER Harvey W. Rockwell, Cedar Rapids, Iowa, assignor to Allis-Chalmers Manufacturing Company, Milwaukee,
Filed Mar. 6, 1964, Ser. No. 349,962 9 Claims. (Cl. 37-8) This invention relates to an improved ejection mechanism 'for an earthmover .and particularly to an ejection mechanism in the form of a retractable bottom. This invention also relates to the elevating, self-loading type scraper.
The elevating, self-loading motor scraper has been used successfully in moving sand, loose earth or other fine materials. Although materials of this type are easily ejected from the scraper bowl, an ejection problem exists lfor this type of machine because of the elevating mechanism being positioned in the front of the scraper there-by precluding front ejection. Previous designs have used a partial bottom opening in combination with a pushout type ejector. Such designs are obviously lirnited to free owing materials of small particle size. To provide an ejection system capable of handl'ng a wider range of materials, I have devised a retractable bottom and strikeoff mechanism which provides full bottom opening.
It is an object o-f this invention to provide an ejection mechanism for an earthmover bowl which provldes full bottom opening.v
It is a further object of this invention to provide a combined strikeoi edge and retractable bottom mechanism.
It is a further object of this invention to prov'de an improved ejection mechanism for an elevating, self-loading scraper which permits relatively long bowl cnstuction with full bottom opening during ejection.
In designing my full bottom opening type ej`ction mechanism for an elevating type scraper, of the type having an endless conveyer at its forward end, I found it desirable to position a pair of hydraulic j-acks for actuating the ejection mechanism, adjacent the inner sides of the bowl side walls. In order to prevent material from packing on the underside of these jacks I provide means at each side of the elevating mechanism to move the material passing into the Ibowl toward the center of the bowl.
Accordingly, it is a further object of this invention to provide means on the elevating mechanism of the m-otor scraper for urging the excavated material be'ng loaded toward the longitudinal center of the scraper bowl.
These and other objects and advantages of my invention will be apparent from the following description when read in conjunction with the drawings in wh'ch:
FIG. 1 is a side View of an earthmover incorporating my invention;
FIG. 2 is an enlarged section view taken along the lines II--ll of FIG. 1;
FIG. 3 is a top view of the earthmover shown in FIG. 1; and
FIG. 4 is a side view partially in section showing the bottom and strikeof mechanism in an open or ejecting position.
Referring to FIG, 1, -a front wheeled draft frame 11 is pivotally connected on a transverse axis 12 to a rear wheeled bowl frame 13 for relative vertical swinging movement under the control of power means in the form of a pair of double acting hydraulic jacks 14, only one of which is illustrated.
Referring also to FIG. 3, the bowl or bowl frame 13 includes a pair of laterally spaced side walls 16, 17 and a transversely extending excavating blade structure 19 rigidly secured at its opposite lateral ends to the side walls 16, 17. A cutting edge 21 is replaceably secured to the exacavating blade structure 19.
In order to provide a full bottom opening, I provide a bottom mechanism which includes a front section 26 and a rear section 27. The forward section 26 is carried by front and rear hinges 28, 29, the latter of which pivotally interconnects the rear end of the front section 26 to the forward end of the rear section on a transverse pivot axis. The hinge 28 pivotally interconnects a transverse strikeoi structure 31 on a transverse pivot axis. Carriages 81, 82 are secured as by welding to opposite ends of the strikeoff structure 31. The carri-ages 81, 82 rotatably carry rollers 36, 37, respectively, which in turn are carried by tracks 32, 33 rigidly secured to the side walls 16, 17.
The rear bottom section 27 includes a bottom wall 38 and a pair of upstanding legs 39, 40. The legs are pivotally connected to the side walls 16, 17 on a transverse pivot axis 41 and the rear bottom section 27 is actuated between closed and open positions by a pair of hydraulic jacks 42, 43. The rod end of jack 42 is pivotally connected to an arm 44 which forms an extension of leg 39. Jack 43 is similarly connected to leg 40. When the jacks 42, 43 are contracted, the bottom and strikeotf structure will move to the full open position shown in FIG. 4 wherein all the material within the bowl will easi-ly be dumped. This position may also be referred to as an ejection or dumping position. As the jacks 42, 43 are contracted, the strikeotf blade 46 will move rearwardly in a straight line and serve to evenly spread the material being dumped. If the bowl is adjusted by jacks 14 to place the tracks 32, 33 parallel to the ground, the material being dumped will Ibe spread on the ground at a uniform thickness.
A pair of guards 51, 52 are provided above the jacks 42, 43 to protect them from excavated material. Augers 54, 56 which are secured to idler sprockets 57, 58 move the excavated material inwardly toward the longitudinal center of the bowl thereby preventing packing beneath the jacks 42, 43. The conveyer mechanism frame 59 is pivoted at its upper end on a transverse axis 61 to brackets 63, 64 extending forwardly from conveyer supports 62, 65, which in turn are rigidly secured to the side walls 16, 17 of the bowl. The underside of the conveyer 66 moves upwardly during operation whereby the slats 67 move the material up the ramp portion 83 of the excavating blade structure 19. The slats 67 are secured to -a pair of -link type chains 68, 69 carried on driving sprockets 71, 82 and idler wheels in the form of sprockets 57, 58.
From the foregoing description it is apparent that I have provided a novel bottom opening mechanism and strikeoff structure which -achieves a full bottom opening and complete material ejection. This dumping mechanism is particularly adapted to use in relatively long scraper bowls and particularly lends itself to use in an elevating, self-loading type scraper.
The embodiments of the invention for which an exclusive property or privilege is claimed are dened as follows:
1. An earthmover comprising:
an open bottom bowl including a pair of laterally spaced vertical side walls,
a transversely extending excavating blade structure secured at its lateral-ly opposite ends to the Ilower forward portions of said side walls, respectively, and
a transversely extending rear wall interconnecting the rear ends of said side walls,
a rear bottom section having a bottom wall extending transversely between the lower portion Iof said side walls and a pair yof upstanding legs secured to sad bottom wall and disposed adjacent the inner side of said side walls means pivotally connecting said legs to said side walls on a iirst transverse pivot axis spaced from said bottom wall,
power means between said bowl and said rear bottom section for pivoting the latter between bottom closed and bottom open positions,
a front bottom section extending transversely between said lower portions of said side walls,
means pivotally connecting the rear end of said front Ibottom section to the forward end of said bottom Wa-ll on a second transverse pivot axis,
a longitudinally extending supporting track adjacent the bottom of each of said side wal-ls, said tracks lbeing parallel to one another and extending between said excavating blade struct-ure and said rear wall,
a transversely extending strikeofl' structure at the rear of said excavating blade structure and carried by said tracks for longitudinal reciprocating movement, and
means pivotally connecting the forward end of said front section to said strikeoi'r structureon a third Vtransverse axis, said axes being parallel to one another.
2. The structure set forth in claim 1 and further comprising a pair of rollers pivotally mounted on each of the laterally opposite ends of said strikeoif structure in rolling vertical load carrying contact with said tracks, respectively. Y
3. The structure set forth in claim 1 wherein said power means comprise a pair of hydraulic jacks operatively interconnecting said walls and said legs, respectively. V
4. The structure Vset forth in claim 3 and further comprising a conveyer mechanism comprising lan inclined frame pivotally secured at its upper rear to said bowl on a transverse axis,
a pair 0f laterally spaced rotary supporting Wheels on the lower forward end of said frame, n
a slat type endless conveyer carried on said wheels,
an auger secured for rotation in unison with each of said wheels and extending axial-ly outwardly therefrom laterally beyond said conveyer and means for driving said conveyer.
5. The structure set forth in claim 4 wherein said wheels are sprockets and said conveyer includes a pair of link type chains meshing with said sprockets.
6 An earthm-over comprising:
a wheeled draft frame,
a wheeled bowl frame connected to said draft frame for vertical swinging movement having a pair of laterally spaced vertcal side wal-ls and a transversely extending excavating blade structure rigidly secured at its opposite ends to the lower forward portions of said side walls, respectively, and
a bottom closure and dumping structure including a rear bottom section pivotally secured to said side walls on a first transverse axis spaced above the bottom -of said walls, v
power -means for pivoting said rear bottom secsecion about said lirst axis between closed and dumping positions,
a front bottom section having its rear end pivotally connected to the forward end of said rear bottom section on a Vsecond transverse axis,
longitudinally extending track means on said side walls, and
a transverse strikeolf structure at the rear of said excavating blade structure pivotally connected to the forward end of said front bottom section on a third transverse axis and reciprocally carried at its transversely opposite ends in said track means.
7. The structure Vset forth in claim 6 wherein said strikeol structure includes a pair of rollers at each of its opposite ends in vertical load carrying relation to said track means, respectively.
8. The structure set forth in claim 7 wherein said track means are channel members secured t-o the outer sides 0f said side Walls, respectively.
9. The structure set forth in claim 8 wherein said bow-l frame includes an upstanding rear wall and said power means includes a pair of hydraulic jacks connected to said side walls, respectively, and to said rear bottom section. t
References Cited by the Examiner UNITED STATES PATENTS 2,988,832 6/1961 Hancock et al. 37-129 3,030,080 4/1962 Hise et al. .37-8 X 3,057,090 10/1962 Mazzarins 37-126 3,108,388 10/1963 Johnson 37-8 X ABRAHAM G. STONE, Primary Examiner. WILLIAM A. SMITH III, Examiner.