US1529499A - Power shovel - Google Patents

Description

A. ORLOFF Powmi' SHOVEL March 10, '1 925.

Fi ed Feb. 29, 1924 2 Sheets-Sheet 1.

March 10, 1925.

A. ORLOFF .POWER sHovEL Filed Feb. 29 1924 2 sheets -sheet 2 g Q 5 u Patented Mar. 10, 1925.

UNITED STATES PATENT OFFICE.

ARTHUR OBLOFF, OF GREEN BAY, WISCONSIN, ASSIGNOR T0 NORTHWEST ENGINEER- ING COMPANY, OF GREEN BAY, WISCONSIN, A CORPORATION OF WISCONSIN.

POWER SI-IOVEL.

Application filed February 29, 1924. Serial No. 695,941.

To all whom it may concern:

Be it known that I, ARTHUR ORLOFF, a citizen of the United States of America, and resident of Green Bay, in the county of Brown and State of Wisconsin, 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 power shovels.

In power shovels in which the dipper and its handle or stick are mounted to swing and shift relative to its supporting boom, it is sometimes necessary and highly desirable to hoist the dipper when the stick is in an extended position so that the contents of the dipper may be deposited at the desired oint. In machines of this general type a cipper stick of reasonable length can be thrust 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 ofthe extended stick, but such constructions put an additional duty on the operator andcomplicate the control mechanism. The object of this invention is to provide automatically operating means whereby the stick once thrust out at or near its limit is'prevented from moving inwardly duringhoisting, such means operating without complicating the control, as by additional levers, and without adding to the duties of the operator.

A further object of the invention is to provide means whereby dipper sticks substan tially 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 dipperoperating 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 articular 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 efiect 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 consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Fig. 1 is an elevation view of an excavating machine embodying the invention; Fig. 2 is a plan view thereof, parts being shown in section; Fig. 3 is a detail sectional view taken'on theline 3-3 of Fig. 2; Fig. 4: is a detail sectional view taken on the line 44 of Fig. 2.

In the drawings the numeral5 designate 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 construc tion equipped with clutches and brakes to control their operation. The boom is adapted to be rais'edandheld 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 glrder 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 1A are loose on the shaft. The dipper handle shown is made in two sections and has a metal covering 11. Each section of the handle is mounted to slide between the adjacent saddle block and a flanged roller 15 loose on said shaft 12. Sheaves 16 and 17 are journalled on the shaft 12 between the rollers 15. The dipper or shovel 18 may be of any suitable construction and is mounted, as usual, at the lower end of the dipper handle.

A hoisting cable 19 dead-ended on the drum 7 passes therefrom over a sheave 2O loose on a shaft2lat the outer end of the boom, then around a transversely disposed padlock sheave 22 pivotally mounted on the dipper around the larger part of a compound drum 23 on which it is dead-ended.

A. cable 24: is dead-ended on the small side 25 of the compound drum and passes one or more times around the drum or "sheave If it is desired to crowd into the material being excavated, orto' move the dipper farther out, as in loading a wagon, the braking ellect on theline 27 is'released slightly, allowing the'line 19, pulling on the larger side of drum 23,to put a pull, here greater'than hoisting effect because of the 1 compound drum, on'lin e 24, which thereupon forces the dipper stick outward. desired to move the dipper farther in, hoist ing with line 27 produces this effect. lVhile the compound or differential drum is preferred, it is to be understood that the inven tion is not to be limited thereto. Thus, by a proper manipulation of the lines 19 and 27 any desired swinging and thrusting movement of the dipper and its handle may be effected. Furthermore, since the line 24 which effects the thrust is actuated by the hoist, a crowding effect equal to the full drivingforce of the engine ,is'se'cured;

With. this and other constructions, howeverywhen the stick'is in an extended position and hoisting is continued until the stick is approaching, at, or above the horizontal, the hoisting cablev 19 and other forces, such as the-w'eightof the dipper and its contents, tend'to shift the stickinwardly.

To restrain the inward'shifting movement of the dipper handle, a part of the drum 23 is'iormeil as a brake-drum 29 adapted to be engaged by a brakeband30. One end 31 of this band is adjustablysecured to one-arm of a bell crank lever 32, loose on a shaft 33 fiziedbnthe boonnand at a greater distance from the oenterof said shaft than the point at which theothe'r end otthe band is secured to the" other arm of said bell crank lever,

thereby providing an automatic brake which-when the drum 23 rotates in a clock wijsedirection, as inoutward shiftingiof the dipper handle, acts to automatically release sald band, and 1n a counterclockwise direc- Conversely, if it is" tion it acts to tighten said band about the drum 29. An arm 34 is also formed as a part of the lever 32 and a spring. 35,,sec'ured at one end to said arm an at its other end to the boom, acts to put an initial tension in id band; As the inward shifting tendency of the stick when in an extended position acts through cable 24 to rotate the drum 23 in a counterclockwise direction, it will be noted that UDClGIf IljlQSQ conditions the re brake-operating means associated with-its run between the drum 8 and the sheavell This means consists of a bejl l crank lever 36v pivotally mounted intermediate its endso'n shaft 36 on the support 13 and operatively connected at its lower endby a 1ink37 with the arm34t. The upper endof said lever 36 carries a roller 38 engaged bysaid runbf said cable 27 to formwhat maybe termed a bight therein, whose magnitude-diminishes when tension is produced in said run'by-the inward pull of the cable 27, and which action causes the upper end of said lever 36 to be swung upwardly and, consequently, through said lever, link 37 andv arm 3% shift said bell crank lever 32 so that its longer arm swings toward the shaft'21 and thereby releases the brake so that the brake is automatically released incident to the operator shifting the dipper handle inwardly, and

hence no additional control mechanisfiihas to be operated by the operator I m V It will be noted that I' have provided means which automatically restrain 'the dipper stick from. moving inwardly, which means is" released through cooperation] with a run or the retracting-cable.

I desire it to be understood that this in vention is notto be limited to any specific form or arrangement of parts, except. in so far assuch" limitations are specified in the claims, j

What I claim as my inventionris. I

I 1 In an excavating shovel, the combina tion of a boom, a dipperand dipper handle mounted on said boom for. swinging and shifting movements relative thereto, means for hoisting thevd'ipper', means including a cablefor'shifting the dipper' h andle in one direction, means for restrainingthe shifting ofthe dipper handle in that direction, and means to release said restraining means including a member engaging a run of said cable andv moved by the operating tension in the cable. p

2, In an excavating shovel, the combination ofa looom ,.a dipper and dipperhan'dle boom "for swinging and shifting movements relative thereto, means for hoisting the dipper, means including a cable for shifting the dipper in one direction, means for restraining the shifting of the dipper in that direction, means biased toward shifting movement in one direction and engaging a run of said cable to be shifted thereby in that direction to release said restraining means.

3. In an excavating shove-l, the combination of a boom, a dipper and dipper handle mounted on said boom for swinging and shifting movements relative thereto, means for hoisting the dipper, means including a cable for shifting the dipper handle in one direction, means for restraining the shifting of the dipper in that direction, and means to release said restraining means including a lever having a part engaging a run of the cable and shifted by the operating tension in the cable.

l. In an excavating shovel, the combination of a boom, a dipper and dipper handle mounted on said boom for swinging and shifting movements relative thereto, means for hoisting the dipper, means including a hoisting drum, a sheave and a cable from said drum runnin over said sheave and having connection wlth said handle for shifting the dipper inwardly, means for restraining the inward shifting movement of the dipper handle, and means to release said restraining means including a member engaging the run of said cable between said sheave and drum and moved by the operating tension in said cable. 7

In testimony whereof I afliX my signature.

ARTHUR ORLOFF.

Images