US2258478A - Excavating shovel - Google Patents

Description

iOct- 1941. w. BAKER ET AL EXCAVATING S HOVEL Filed March 7, 1940 2 Sheets-Sheet l WALTER 514x57? DAV/D W (EH77 the shovel, such as ,matic diagram, of the electing d' .ve of and for turnhhing power for driving the traction, wi e and boom hoist. a

, in 'section,'also Patented Oct. 7,1941

axcnvn'rmc SHOVEL Walter Baker, Davld W.

Crow, Cedar,Bapids, Iowa, Belt Speeder Corporation,

poration of Illinois new, and Luther n.

assignors to Link- Chlcago, 111., a cor-v Application Match 7, 1940, SerialNo. 322,742

Claims.

This invention relates to excavatingshovels and the' like and has particular relation to a means for driving and actuating various mechanisms of the shovel, particularly the boom hoist,

the swing mechanism, and the travel mechanism.

In mechanisms of the character here considered, it -is desirable that two diflerent speeds of the driving or traction mechanism be provided whereby movement of the shovel, while used in excavating, shall be relatively slow but with great .power and such that movement of the shovel from place to place may be accomplished at relatively hig er speed. t

It is desirable also that other mechanisms of the swing mechanism and the boom hoist, be driven at two or more speeds.

be located within the turntable base where it is protected from the abrading influence of dirt. rock and the like, and furthermore such a drive should be quite simple in order that it may be sufiiciently strong to withstandthe high torque employed. v

It is among the objects of our invention to provide a simple, reliable, and relatively inexpensive structure which shall meet the above requirements and which shall be effective to selectively drive the travel mechanism, the swing mechanism, and the boom hoist at a plurality of speeds, and further, to provide for locking the boom at any point to prevent downward movement except under controlled power.

Other and further features and objects of the invention will be more apparent to those skilled in the art upon a consideration ofthe accom panying drawings and following specifications, wherein is disclosed a single exemplary embodiment of the invention, with the understanding,

-,however, that such changes may be made therein as fall within the scope of the appended claims, without departing from the spirit of the invention.

In said drawings:

Figure '1 is a view in perspective ofa shovel to h which our two speed driving mechanism has been applied. Figure 2 isa plan view, more or less in schedriving mechanism for the various hoists and the like 3' is a view partly in elevation and partly diagrammatic in character, illusevel. boom trating -how' drive of the A two speed drive suitable for the purpose should s hoist is secured from the main hoisting apparatus shown in Figure 2.

Figure 4 is a view in exploded relation of the boom hoist drive mechanism, a portion of which is shown in Figure 3, and

Figure 5 is a fragmentary view, partly insection and partly in elevation, of the clutch mechanism by which selective drive of the gear trains, is effected.

.Referring now more particularly to Figure 1, our driving mechanism may be employed in an excavating shovel such as that shown in this figure." This shovel isflofmore or less conventional design and has a base platform l0 mounted on crawler tracks II which are driven by means of suitable sprockets l2. 1

A bull ring I3 is mounted on the upper face of the base In and'a turntable platform H is mounted for rotation on the platform Ill-by means of a collar it (Figure 3) and hold-down rollers, such as illustrated at H, rotatably mounted by means of brackets It on the under side of the turntable or upper platform H.

A'boom 2| is supported on the turntable 14 by means of brackets 22 in which the boom is pivotally mounted.

A two-part dipper tick, illustrated at..-23, is slidably supported for in and out and pivotal movement by the saddle block 2|, all in accordance with usual practice.

The excavating shovel 25 is mounted on the end of the dipper stick 23 and may be raised and lowered for digging movement by means of the hoisting cable. 21. The hoisting cableis wound on the hoisting drum 28 illustrated in Figure 2. The hoisting drum is not shownin Flgure2 in its true position for the sake of clearness.

Crowding of the excavating shovel downwardly and outwardly and retraction thereof is secured by the reversiblecrowd drum 29, the forward or reverse operation of this drum plished through selective clutches "and 30a. The drum 28 drives the chain 3| which rotates sprockets at the pivotal axis of the boom. The

drum 2!, through the agency of the chain's ti 'and 32. the sprocket 33, and gear rack 34, re-

tracts the dipper stick 23 or crowds it outward- Power for driving the mechanism of the excas5 drive pinion 40a mounted on the other end therebeing" accomof. This drive pinion is enmeshed uwith the spur gear 42 which drives the main crosssbaft 4! upon which oppositely disposed bevel gears 41 and 48 are mounted.

Clutches 4! and ii are provided to selectively engage the bevel gears 41 or 4| to the shaft. and by means of these bevel gears a vertically mounted bevel gear 52 may be rotated in one direction or the other as desired.

.The hoist and crowd drums are driven from the main cross. shaft 48 by gears 4i and 43 engaged with the drive gear 42. l

- rectly rotated at a relatively high rateof speed.

per drive gear so and the clutch 84 engages the pinion I! on the shaft, the shaft 83 will be di- If, however, the jaw clutch I4 is engaged to the lowerselective drive gear 51, this drive gear will rotate the idler gear 59. Since the idler gears 59 and 58 are secured to each other, the spur gear The bevel gear 52 is secured on the upper e d of ayertical drive shaft 53 and a two way ciutc i4 is disposed so that an upper drive pinion I! or lower drive pinion 51 may be engaged by the clutch so that rotation of the shaft 53 will 19- tate either of the gears It or 51 as desired. I

The construction and arrangement of the drive gears II and I1 and their'selective drive clutch I4 is shown in Figure 5. The larger drive gear I is ioumaled upon a cylindrical portion 51a of the smaller drive gear 51, this last gear being I8 will rotate the drive gear, as a driven or id-- ler gear, and the gear 58 acting as an idler gear in the gear train will rotate the gear 82 at a comparatively low speed. It is therefore apparent that the boom hoist slieave 80 may be rotated or driven at two different speeds, and this is of considerable importance in raising and lowering the m. For instance, if the lbadis light the boom may be rapidly raised inasmuch as a large number of supported. in turn, for rotation on the vertical drive shaft 53. The selective clutch I4 is slidably received on a splined portion 53a of the drive shaft to permit a toothed portion 55 of the clutch to be engaged with matching clutch teeth 5th or 51b on either of the drive gears.

The gear so is m mesh with the swing Shaft idler gear 58. The gear 51 is in mesh with the lower swing shaft gear 59. The Bears 58 and 59' plural or variable speeds. The drives are adeare rotatably mounted on the shaft Cl and en- I gagement of these gears with 'th shaft is effected through the jaw clutch '62. En agement of the shaft 8| with the gears 58 and 58 will rotate the swing shaft pinion 63. This swing shaft pinion engages the bull ring II to wing the turntable l4 in either direction as desired.

.The lower gear 59 is in mesh with the travel gear 08 and a jaw clutch 81 may selectively engage or disengage this gear with the travel drive shaft OI. The bevel gear 68 mounted on the lower end of the travel shaft It is engaged with a horizontal traction drive gear ll mounted on shaft 12 on which sprockets (not shown) are also mounted and which drive the traction drive sprocket l2.

' It is undesirable that the swing shaft be actuated at the same time that the travel shaft is rotated. Thereforethe jaw clutches 82 and 61 are controlled for selective engagement by means of turns of the cable on various sheaves are required to properly support the boom, this high speed movement for winding up the boom hoisting cable is very desirable. If there is a heavy load on the shovel the lower speed is used so that much greater power is supplied for winding the boom hoist cable on the drug: 80.

It is apparent that we have provided a very simple and a very rugged drive means for driving either the travel, the swing or the boom hoist at quate to meet the heavy torsional forces applied to them. The main portion of the gear train may be enclosed within the turntable frame II where it is readily protected from abrasive effect of sand, gravel, dirt and the like. Control of the direction of rotation of all three of these memhers is secured by means of clutches 49 and SI which may becontrolled by a single lever. Control of th travel, swing and boom hoist is secured by a vertical drive shaft, a pair of idler gears rotatably mounted on the swing shaft and in mesh with the drive gears, a clutch for selectively engaging clutch forks controlled by a lever II which is pivotally mounted as at ll. Movement of the. lever 1| to the? left disengage-s the travel clutch 01 and engages the swing clutch 62. Movement of thelever to'the right disengages the swing shaft and engages the travel shaft. I

A cable ll is'mounted over a suitable number of sheaves for raising and lowering the boom. This cable is trained over a boom hoist sheave ill and this boom hoist sheave is driven by means of a gear train I am about to describe. An exploded view of the boom hoisting means is shown Figure 4.

A pinion 82 is adapted to be engaged with one of the selective-drive gears SI or 51 on the vertical shaft. This pinion I! is slidably mounted on a drive shaft 83 and may be disengaged from its drive gear by means of a clutch fork connected to the collar 84. v

A worm OI is mounted on the shaft 83 and engages a worm gear ll which is in turn engaged on the shaft II to drive the boom hoist sheave .80.

Now if the jaw clutch I4 is engaged to the upone or the other of the drive gears, boom hoist drive gearing in mesh with one of the drive sears whereby when one of the drive gears is engaged by the clutch to the drive shaft, the boom hoist gear in mesh with that gear is rotated at one speed, and whereby, when the other drive gear is V in mesh with the drive shaft, the first drive gear is rotated at a different speed through the idler gears on the swing shaft, a travel drive gear engaged with one of the idler gears, and means for selectively engaging or disengaging said travel drive gear with the travel shaft.

.2. In an excavating shovel, the combination and, arrangement of means providing for plural speed drive of a traction drive shaft and .a boom hoist comprising a main cross shaft, a vertical drive shaft, means for selectively driving the vertical drive shaft forward or backward from the main cross shaft, a pair of drive gears'mounted for rotation on the vertical drive shaft, two-way clutch means for selectively engaging the vertical drive shaft with one or the other of the drive gears, a boom hoist, a boom hoist gear engaged with one of the drive gears, means for disengaging other position of the clutch, drive of the boom hoist gear is through the other drive gear, the

the boom hoist gear from the drive gear, a pair of connected idler gears meshed with both of the drive gears, a traction drive gear engaged with one of the idler gears, a traction drive shaft, and means for selectively engaging or disengaging I same with the traction drive gear.

3. In an excavating shovel having a mobile lower frame and a rotatable upper frame, a boom hoist, plural speed means for driving the boom hoist comprising a vertical drive shaft extending downwardly through the upper frame, a pair of drive gears rotatably mounted on the vertical of connected idler gears also disposed between the upper and lower frames and engaged with the drive gears whereby the boom hoist drive may be driven at one speed directly from one drive gear or at another speed through the other drive gear, through the connected idler gears, and through the first mentioned drive gear used as'an idler gear. I l

4. In a drive means for machines of the character described, a vertical drive shaft, 9. vertical driven shaft, at least two, horizontally disposed and closely parallel gear trains between the drive shaft and the driven shaft, a two-way clutch at the drive shaftfor selectively driving one or the other or the gear trains, and a boom hoist shaft and gear in mesh with one of the drive gears of the'gear trains, the driven gears being connected together, whereby in one position of the two-way clutch, drive of the boom hoist gear is direct from one of the drive gears, and whereby in andriven gears, and the first drive gear.

5. In an excavating shovel having a mobile lower frame and a rotatable upper frame, a main drive shaft extending transversely above the upper frame, a-vertical drive shaft extending downwardly through the upper frame, a bevel gear on the upper end of the vertical shaft and a pair of opposed bevel gears on the main drive shaft engaged with the first mentioned bevel gear, means for selectively driving the first mentioned bevel gear from one or the other of the opposed bevel gears for driving the vertical drive shaft in forward or reverse direction, a pair of horizontally disposed drive gears mounted for rotation on the, vertical shaft between the, upper and lower frames, a swing shaft, a pair of connected idler gears mounted for rotation on the swing shaft and engaged with the drive gears, a traction shaft, a traction gear mounted for rotation thereon and engaged with one'of the idler gears, a boom hoist including a worm and worm gear drive, a drive pinion for the boom hoist slideably engaged with one of the pair of drive gears, clutch means for selectively engaging or disengaging the traction shaft with the tractiongear, clutch,

means for selectively engaging or disengaging the swing shaft with the idler gears, and twoway clutch means for selectively coupling the vertical drive shaft and either of the drive gears,

whereby the traction shaft, swing shaft'or boom hoist may -'be selectively driven at either of two speeds in either forward or reverse direction.

WALTER BAKER.

DAVID w. LEHTI. LUTHER H. caow.

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