US1682774A - Excavator - Google Patents

Description

Sept. 4, 1928; 1,682,774.

:5. c. CLUTTER EXCAVATOR Filed March 22, 1927 2 sheets-sheet 1 INVENTOR. E IRE [1E LLJTTER A TT ORNE Y.

Sep t. 4, 1928. 1,682,774

B. C. CLUTTER EXGAVATOR Filed March 22, 1927 2 Sheets-Sheet 2 INVENTOR. Ewen ELILLJTT ER- ATTORNEY.

Patented Sept. 4, 1928.

UNITED STATES 1,682,774 PATENT OFFICE.

BIRD C. GLUTTER, F AKRON, OHIO, ASSIGNOIR, BY MESNE ASSIGNMENTS, 'I'O OLUTTER- WAGNER, INC., A CORPORATION OF OHIO.

' EXCAVATOR.

' Application filed March 22, 1927. Serial No. 177,296.

This invention relates to excavators, and particularly to those embodying a dipper arm for carrying the scoop and pivoted on the boom.

In the-operation of such. excavators, es-

pecially whenswinging the 'boom laterally either on'full-revolving or other excavators, inertia forces tend relatively to swing the the dipper and scoop transversely of the l boom which exerts tortional stresses in the boom structure distorting the same.

The general purpose of the present invention is to provide an improved pivotalcon nection between the dipper arm and the boom, whereby restricted lateral swinging of the arm and scoop will be permitted thus relieving the boom of heavy tortional strains and also permitting moreefie'ctive manipulation of the scoop in forming straight or even under-cut walls in excavations.

The above andother purposes are attained by the excavator'disclosed in the accompanying drawings and described below. It is to be understood that the invention is not my limited to the specific form thereof shown and described.

.Of the accompanying drawings,

Figure 1 is a part side elevation-"of anexcavator embodying the invention;

Figure 2 is a section on line 2-2 of Figure 1, and. v

Figure 3 is a detail section of the pivotal mounting for the' dipper arm or stick on the boom.

Referring to the drawings, the excavator therein shown isof the ditcher type, such as disclosed in United States Letters Patent No.1,561,694, granted November 17,1925,

but it is understood that many of the bene- Fill its use in any type of excavator employing a boom and dipper arm. I

The numeral 10 designates the boom which may be mounted for vertical swinging movement and also for lateral movement in any of the well-known types of full-revolving or lateral swinging boom excavators. Pivoted at 11 on the boom 10 is the dipper arm12 carrying a scoop 13 which is actuated by cables 14: and 15, the-former being connected to the arm '12 at a point above pivot 11 and the other to the scoop 13 by means of the bale 13 The angularity of the scoop 13 on the arm as herein shown is arranged to M be adjusted automatically by links 16, bellfits of the invention are tobe derivedfrom in slot's 22, 22 formed through the sides of a box-bearing 23 secured on dipper arm 12 and having concave, cylindrical bearing surfaces at 24, 24 hearing on bearingmem-" bers 20 which preferably have friction material 25 thereon, such as Babbitt metal. The squared extensions'21 cooperating with slots 22 serve to hold the cooperating hear.

ing members 20 and 23 in proper assembly and also the length of the slots 22 defines the llmlt of relative shifting between bear "mg members 23 and bearing members 20.

It will be seen that relative pivotal movement of the arm 12 and boom 10 in a vertical plane takes place about pin 11, the whole bearing assembly 20, 20 and 23 moving with the arm 12 and capable in any position of' said arm of permitting relative lateral swinging of the arm with respect to the boom which is limited by engagement of extensions 21 with the ends of slots 22. This lateral swinging of the arm relative to the boom occurs when the boom is swung laterally and is the reaction of forces overcoming the inertia of the stick, scoop and mass of material in the scoop. The lateral pivotal movement ofithe arm is resisted to some extent by the friction .in the bearing and a large measure of the load previously expended in the-boom as tortional stress is absorbed in the arm as longitudinal stress since lateral swinging of the arm elevates the center of gravity of the load supported thereby.

In excavating operations it is possible by skillful manipulation of'the excavator to swing the scoop 13 laterally into such posi-' tions as effectively to cut square corners and straight or even under cut walls.

Modifications of the invention may be resorted to without departing from the spirit thereof or the scope of the appended claim. V

What is claimed is:

An excavator comprising a boom, and a 1m stick pivoted on the boom, the pivot for the on said first bearing member and extensions stick on the boom comprising a pin on the on the first bearing member engaging in slots boom, a bearing member 'journaled on the in the box-bearing member for retaining the m pin and formed with transversely curved ,bearing members in pro er relationship and 5 bearing surfaces, 9. box-bearing member limiting relative. latera movement of the i secured to the stick and having surfaees coboom and stick. z operating with said curved bearing, surfaces BIRD C. CLUTTER.

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