US940035A

US940035A - Excavating apparatus.

Info

Publication number: US940035A
Application number: US49846609A
Authority: US
Inventors: Arthur E Lehmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-05-26
Filing date: 1909-05-26
Publication date: 1909-11-16
Anticipated expiration: 1926-11-16

Description

A. E. LEHMANN.

'EXGAVATING APPARATUS. V APPLIOATION FILED MAY 26. 1909.

Patented Nov. 16. 1909.

2 SHEETS-SHEET 1.

MW V444 ar- ARTHUR E. LEHMANN, or ST. marinas, 'mrssouat.

EXCAVATING areas-ares.

Specification of letters Patent. Patented Nova 13, 1909.

Application filed Kay 26, 1903?. Serial No. 498,466.

To all whom it may concern:

Be it known that I, ARTHUR E. LEI-IMANN, a citizenof the United States, residing at St. Charles, in the county of St. Charles and State of Missouri, have invented a new and useful Improvement in Excavating Apparatus, of which the following is a specification.

My invention relates particularly to the bucket or shovel of an excavating machine, and to improved means combined therewith, firstly, for regulating the depth of cut by the bucket according to the-nature 0f 'the material to be excavated, secondly, for automatically adjusting the inclination of the loaded bucket about its pivotal point of suspension from the derrick of the machine at the initial raising of the bucket from the ground, thirdly, for automatically dumping the bucket at a predetermined height while being raised, fourthly, for dumping the bucket at any desired point below the said height, and fifthly, for automatically scraping or cleaning the bucket while dumping, and my invention has for its object to simplify construction, to insure ready and positive action of the bucket, and to reduce the strain on the hauling and lifting gears of the machine.

The invention consists in features of novelty as hereinafter described and claimed, reference being had to the accompanying drawing forming part of this specification, whereon,

Figure 1, is a side elevation of an excavating bucket or shoyel in the digging position with the combined parts of the apparatus constructed-and arranged according to my invention for respectively, adjusting, and dumping the bucket; Figs. 2, 3, and 4, similar views to Fig. 1, showing the relative arrangements of the said parts in the initial raising, and dumping positions respectively,

of the bucket; Fig. 5, a horizontal section to enlarged scale through the bail of thebucket on

line

5, 5, in Fig. 1, showing the latter (partly broken away) and its appendages in top plan view; Fig. 6, a rear end view of the bucket (partly broken away) and its appendages; Fig. 7, a cross section to enlarged scale through the derrick boom of the machine on

line

7, 7 in Fig. 4. showing the auxiliary sheave carried thereby, and combined gripping device, forming parts of my invention in the operation of the lifting rope of the bucket; Fig. 8, a top plan view of the gripping device detached from the boom; Fig. 9, a side elevation to enlarged scale of the adjustable stop on the liftingv rope, seen in Figs. 1, 2, 3, and 4, and forming part of my invention for regulating the dumping altitude of the bucket; Fig. 10, a top plan view thereof; Fig. 11, a side view to enlarged scale of the adjustable stop at each side of the bucket for regulating its inclination when loaded and initially raised from the ground, and Fig. 12, a horizontal section through the side wall of the bucket on

line

12, 12,-in Fig. 11, showing the stop in top plan view. 1

Like letters and numerals of reference denote like parts in all the figures.

a represents an excavating bucket or shovel the body of which may be of any suitable size, shape, and material, preferably of sheet metal, open at its front end and at the top, and comprising in the present case two opposite upright side plates 1, and a bottom plate 2 having a front cutting edge 2 and bent upwardto form the closed rear end of the bucket a as shown, the plates 1 and 2 being united together at their edges by angles 3, combined with suitably shaped yokes or braces 4:, 1, which straddle the top and bottom respectively, of the bucket a at. its open front end and are secured to the side plates 1 thereof.

The bucket a is pivoted externally at the sides and rearward of its center of gravity, by pins 5 projecting therefrom, to the bail b which straddles and extends a suitable distance above the bucket to for allowing clearance to the latter between the arms of the bail Z) when dumping about its pivots 5. In the upper part of the bail b is pivoted an upright sheave (5 which With the bucket a and bail b is supported by the lifting rope 0, the latter passing thereunder and upward therefrom at its front edge to a sheave 7 pivoted to the derrick-boom d and over the sheave 7 to the lifting gear of the machine, which being of the usual well-known construction needs no description or illustration; while from the sheave 6 at its rear edge the lifting rope 0 passes upward and over an auxiliary sheave 8 pivoted to the other by a transverse bar or brace 9, being adapted for the coupling thereto of the hauling cable 6, and hereinafter termed the traction members.

For regulating the depth of cut by the front cutting edge 2' of the bucket a in its digging position as seen in Fig. 1, each traction member 9 is perforated preferably atits outer free end with an upright series of spaced apart holes 1l adapted respectively, to receive the coupling-pin 12 of the hauling chain or cable e which is operated by the usual hauling mechanism of= the machine, so that in pulling on the cable 6 when coupled to the bottom hole 11 of the series as shown,

the bucket a is drawn and caused to dig practically horizontally, or with the minimum cut into the ground, but when adeeper cutof the bucket a is desired, the coupling-pin 12 of the hauling cable 6 is removed to a higher hole 11 of the series and thereby constrains the traction members 9 downward thereat and causes the cutting edge 2 of the bucket a to sink deeper into the ground.

For automatically. adjusting or limiting the inclination of the bucket a when loaded about its pivotal point 5' with the bail b, at the initial raisin of the bucket a from the ground, eachsi e wall of the bucket a is preferably perforated near the top with a ongitudinal series of spaced apart holes 13 adapted respectively, for the passage therethrough of a bolt 14 by which an outwardly projecting stop f is adjustably fixed thereat to the side of the bucket a, as seen particularly in Figs. 11 and 12, the inner or rear end of the stop f opposite to the front edge of the corresponding arm of the bail b diverging upward from the latter, so that, when raising the loaded bucket a by the lifting rope 0 about the sheaves '6, 7 and 8, and by the auxiliary chain c, the front end of the bucket a, owing to the extent ed leverage of its traction members 9 to which the chain c is coupled, from the fulcrum 5, is initially raised until the stops f are brought into engagement with the front edges of they bail b as seen in Fig. 2. For this purpose also, a longitudinal series of spaced apart holes 15 are formed through each traction member 9, preferably at the top, for the removal of the coupling-pin 16 of the chain c from one hole 15 to a; ather of the series according to the desired initial tilting of the loaded bucket a therein.

For automatically dumpin the loaded bucket a at a predetermined height from the ground while being raised, the lifting rope c is provided with a. stop g which may be of any suitable construction adapted to be clamped the rope 0, consistin in the pres-- ent case of a'tubular collar It? naving a top scopes flange 17 of suitable diameter, and made therewith in halves,, each half having two opposite outwardly projecting ears 18 for the passage therethrough in their assembled position of bolts 19 by which the halves of the stop 9 are fixed together around and tightly clamped to the lifting rope c (as seen in Figs. 1, 2, 3, and particularly Figs. 9 and 10) at or adjacent-to its connection with the auxiliary chain 0. Dependent from and fixed at the top by rivet-s 20 to the underside of the derrick-boom d (or equivalent member of the machine) is a casing [L which may be of any suitable construction and depth, comprising preferably, two opposite spaced apart upright side plates 21 which are united at the bottom by a floor-plate 21 having a suitable elongated opening 22 (seen particularly in Fig. 8) for the passage therethrough of the lifting rope 0, the length of the opening22 allowing free rearward and forward movement of the rope c, and its width somewhat less than the diameter of the top flange 17 of the stop gwhich is so arranged that,.on raising the loaded bucket a .1

by the lifting rope about the

sheaves

6, 7, and 8, to a predetermined height, the stop 9 will engage the underside of the floorplate 21' of the casing h and thereby prevent the further raising of the front end of the bucket a, whereby the lifting rope 0 continuing to raise the rear part of the bucket a through the bail Z), the bucket a will be moved by the latter until the load acting through its center of gravity causes the bucket a to fall at its front portion about its pivots 5 into the position shown by Fig. 3, or dumped.

For dumpin r the bucket a at any desired height below t at last described, I provide a suitable device adapted to grip the lifting rope 0 previously to the engagement of the stop 9 with the floor-plate 21 of the easing h, this device comprising in the present case two opposite upright brake-shoes 23 Y which are arranged within the casing it be fore described, adjacent to the sheave 8, one on each side of the lifting rope c in pro):' imity thereto but normally outof contact therewith, one of the brake-shoes 23 being pivoted laterally by a pin 24 to one end of two opposite and parallel links 25 which are coupled at their other ends to the fulcrum-pin 26 of a, lever 2' of the first order having one arm 27 projecting upward and coupled at its free end to a rope or chain 28 extending in one direction and controlled by the operator of the machine, and to the boom 65 in the opposite direction by a spiral spring 29 which in the normal position of the brake-shoes 23, or when free of the rope c, is in minimum tension, the other arm 30 of the lever a being coupled at its free end by a pin 24' to the other brake-shoe23.

Hinged at a suitable distance beneath the brake-shoes 23 to the side plates 21 of the casing h on each side of the lifting rope 0 by a pin 31, are two opposite and parallel arms 32 between which is axially mounted i pulling over the lever i by the rope 28 against the tension of the spring 29, the. brake-shoes 23 are drawn toward each other by the movement-of the arm 30 of the-lever z' and the links 25 in connection. respectively with the shoes 23, and of the arms 32 about their hinge-pins 31 as fulcrums so as to grip the lifting rope. c at a point between the sheave 8 and stop g-before the latter has reached the floor-plate 21" of the casing h and there by prevent its further upward movement and cause the dumping of the bucket a at any desired height from the ground below that determined by the stop 9.

.For automatically scraping or cleaning the bucket a while dumping, I preferably use'a yoke-shaped scraper-bar 34 which is arranged in a suitable plane within the bucket a with its members parallel and in proximity to the 'walls 1 and 2 of the bucket a, the arms of the scraper-bar 34 being fulcrumed at their freeends by pins 35 in bearings therefor through'the side walls 1 of the bucket a forward of the bail b. On the outer projecting end of preferably each, fulcrumpin 35 is fixed anarm 36which is coupled at its upper free end, by a link 37 to a pin 38 which projects :from the side of the bail b at a suitable distance from its pivotal connection 5. to the bucket a, the arm 36, link 37, and pin 38 being so arranged relatively to the movements of thebucket a about its pivots 5 as to hold the scraper-bar 34 in a constant plane, or so that in dumping the walls 1 and 2 of the bucket a will move- 1. In apparatus of the class'described; the

combination of an. excavating bucket having its front end open and a suitable cutting edge thereat, means for supporting the bucket inthe digging position,- a traction member fixed to thebucket and projecting forward from its said end, and a cable adapted to be directly coupled to the said member at 'varying heights respectively,

from the said edge for hauling the bucket and regulating the depth of cut by the said edge into the material to be excavated, substantially as described.

2. In apparatus of the class described, the combination of an excavating bucket having its front end open, a bail pivoted to the bucket at a point rearward of the center of gravity thereof, a traction member fixed to and means adapted 'to engage the said bail for limiting the inclination thereto of the bucket when so raised, substantially as described.

j 3. In apparatus of the class described, the combination of an excavating bucket having its front end open, a bail pivoted to the bucket at a point rearward of the center of gravity thereof, a traction member fixed to the bucket and projecting forward from its said end, means adapted to be connected to the bail in its vertical position, and to the said member, for raising the bucket at both the said points of connection thereto, simultaneously, and means for limiting the said raising of the bucket through the said member while continuing to raise it through the bail, for dumping, the bucket at' a predetermined, and varying heights res ectively, from the ground, substantially as escribed.

4. In apparatus of the class described, the combination of an excavating bucket open at its front end, a bail pivoted to the bucket at a point rearward of the center of gravity thereof, a traction member fixed to the bucket and, projecting forward from its said end, means adapted to be connected to the bail in its vertical position, and to the said member, for raising the bucket at both the said points of connection thereto, simultaneously, means for limiting the said raising of the bucket through the said member While continuing to raise it through the bail, for dumping the bucket, and means for dislodging the excavated material from the walls of the bucket while being dumped, substantially as described.

ARTHUR E. LEHMiANN.

\Vitnesses EDWARD W. FURRELL',

HAL G. BELLVILLE.