US1829987A

US1829987A - Back digging shovel

Info

Publication number: US1829987A
Application number: US362627A
Authority: US
Inventors: Mitchell L Fykse
Original assignee: Bucyrus Erie Co
Current assignee: Caterpillar Global Mining LLC
Priority date: 1928-07-27
Filing date: 1929-05-13
Publication date: 1931-11-03
Anticipated expiration: 1948-11-03

Description

Original Filed July 27, 1928 Jafidl 2. ya,

\INVENTOR. BYXMfWX A TTORNEYS.

Patented Nov. 3, 1931 UNITED STATES PATENT v OFFICE MITCHELL L. FYKSE, OF SOUTH MILWAUKEE, .WISCONSIN, ASSIGNORTO BUCYBUS-ERIE COMPANY, OF SOUTH MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE BACK DIGGING SHOVEL Original application filed July 27, 1928, Serial No. 295,661. Divided. and this application filed May 13, 1929. Serial No. 362,627.

My invention relates to new and useful improvements in back digging shovels.

This application is a divisional of my copending application, Serial No. 295,661, filed 5 July 27, 1928.

Back digging shove-ls are well known in the excavating art. They are characterized by a dipper mounted on the lower end of a handie, which is pivoted intermediate its ends on 10 the outer end of the boom, the inner end of the boom being pivoted to the frame of the machine. The shovel faces toward the machine. On' the main frame of the machine is a two-drum winch, from which one rope,

" associated with the dipper, tends to drag the dipper toward the machine. The other rope of the winch is associated with the upper end of the dipper handle and tends both to raise the boom and to cause the dipper to move away from the machine.

The principal object of my invention is to provide novel locking means so that the two ropes will not waste power pulling against 7 1 each other during the hoisting of the boom.

J Further objects and advantages of my invention will be readily evident, as the descrip tion progresses.

The invention consists in the novel parts,

and in the combinations and arrangements 40 of a power shovel embodying my invention.

Referring to the drawing, it will be seen that 5 is the main base of the power shovel, supporting the boom 6, the A-frame 7 and the main winch 8. The main winch 8 includes two hoist drums 9 and 10, aotuable by any convenient power source (not shown).

On the outer end of boom 6 is a hinge pin 11, which serves as a horizontal pivot for the handle 12. Hinged to the boom by the hinge pin 11 is a swivel piece 13 provided with a swivel axle 1 1 which extends through a hushed hole in the handle 12.

A spring bumper 26 is provided on the top of the outer end of the boom' 6 to contact with bumper plate 27 of the handle 12 whenever the handle is in its most extended position.

On the upper end of the handle are two hoist sheaves 28, and on a bracket 29 in the lower end of the handle is a padlock sheave 30.

A digging dipper 31 is held by the lower end of the handle 12 and by a brace 32.

A rope 37 passes from an anchorage 34 on the'boom 6, around the padlock sheave 30, thence through the boom and between two guide sheaves 38 on the A-frame 7, to the drum 9 of the main winch 8. A rope 39 is anchored in a rope socket 40 which is pivoted to the apex of the A-frame 7 This rope then passes around one of the hoist sheaves 28, thence around one of the sheaves 11 at the apex of the A-frame, thence around the other hoist sheave 28, thence around the other sheave 41 at the apex of the A-frame, and thence to the drum 10 of the main winch 8.

Digging is accomplished by pulling in on rope 37, the exact height of digging being varied by slightly pulling in or paying out rope 39. hen the full dipper 31 has been pulled as near as possible to the boom 6, it is maintained in that position by further pulling in on the rope 37, as hoisting is accomplished by rope 39. When hoisted to the desired spot, dumping is effected by pulling in on rope 89 and simultaneously paying out rope 87.

It will be noted that during the hoisting operation, it is necessary that the two ropes should pull against each other, at considerable waste of winchenergy. Accordingly there are provided two hooks 42 depending from the outer end of the boom 6, and a cooperating bar 43 extending through the handle 12 and beyond its sides. When the dipper is drawn toward the machine in digging, the bar 43 engages the hook 42 automatically. Then, in hoisting, power need be applied only to the rope 39. hen hoisting has been accomplished, the hooks 42 are then in such a position that they would tend of their own weight to fall away from contact with the bar a3, were it not for the fact that this bar is pulling against the curved part of the hooks and thus holds them in position. However, the moment that, in this position, a slight pull is given to rope 37, the hooks are disengaged and fall away from the bar toward the boom, so that a subsequent pull on rope 39 will cause the dipper to swing away from the machine to dump.

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbefore described, except in so far as such limitations are specified in the appended claims.

I claim:

1. In a machine of the class described, the combination of: a main frame; a boom, pivoted at its lower end to the frame, for swinging in a vertical plane about its pivot; a dipper handle, pivoted intermediate its ends at the outer end of the boom; a digging dipper; a hoisting rope associated with the upper end of the handle; a digging rope associated with the lower end of the handle; a catch-member on the boom; and a catchmember on the handle, to engage the catchmember on the boom under the influence of the digging rope when the boom is at a rela tively small angle with the horizontal, and to disengage under the influence of the digging rope when the boom is at a relatively large angle with the horizontal.

2. In a machine of the class described, the combination of: a main frame; a boom, pivoted at its lower end to the frame, for swinging in a vertical plane about its pivot; a dipper handle, pivoted intermediate its ends at the outer end of the boom; a digging dipper; a hoisting rope associated with the upper end of the handle; a digging rope asso ciated with the lower end of the handle; and means for locking the handle, against swing-- ing with respect to the boom, during hoisting, whereby to prevent the two ropes from pulling against each other; said means automatically engageable during digging, and being adapted to disengage by a pull on the digging rope after hoisting.

3. In a machine of the class described, the combination of: a main frame; a boom, pivoted at its lower end to the frame, for swinging in a vertical plane about its pivot; a dipper handle, pivoted intermediate its ends at the outer end ofthe boom; a digging dipper; a hoisting rope associated with the upper end of the handle; a digging rope associated with the lower end of the handle; a hook on the boom; and a bar on the handle, to engage the hook under the influence of the digging rope when the boom is at a relatively small angle with the horizontal, and to disengage under the influence of the digging rope when the boom is at a relatively large angle with the horizontal.

In testimony whereof I aflix my signature.

MITCHELL L. FYKSE.