US1815820A - Dipper tooth - Google Patents

Description

. ly 1931- Q o. w. ANDERSEN 1,815,320

DIPPER TOOTH Filed Nov. 30. 1928 2 Sheets-Sheet l 1&1. 2. v Z6 July 21, 1931. o. w. ANDERSEN DIPPER TOOTH Filed NOV. 30, 1928 2 Sheets-Sheet 2 Patent ed July 21, 1931 mun-:1) STATES PATENT OFFICE OSCAR ANDERSEN, 01' OAK PARK, ILLINOIS, ASSIGNOR TO PETTIBO'NE MULLIKEN COMPAN'I'OI' CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK DIPPEB TOOTH Application filed November 30, 1928. Serial No. 322,776.

My invention relates to teeth for dippers such as are used for'excavating, dredging,

I {such teeth in place on the dipper, the invention relating more especially to constructions of the type in which the tooth proper extends at a part thereof into a recess in the base for the tooth and disposed crosswise of the cutting edge of the tooth, and portions of the base, more particularly at its outer terminal portion, extend into recessed portions of the tooth proper to aid in resisting lateral pressure directed against the tooth, the vtooth proper being secured to the base as by a pin.

My primary object is to provide a construction of the general type above referred to in which the securing means, such as a pin, shall be rendered highly effective to resist the shearing stresses to which such means are subjected 1n digging, and furthermore be readily accessible for removal, when desired, without obstruction from adjacent teeth.

Referring to the accompanying drawings Figure 1 is a view in elevation of a portion of excavating apparatus comprising a dipper embodying my invention, the dipper being shown as associated with a bank of material against which it is operating.

Figure 2 is an enlarged side view of one of the dipper-tooth bases, with a dipper tooth thereon, with which the dipper of Fig. 1 is provided.

Figure 3 is an edge view 'of the structure shown in Fig. 2.

-Figure 4 is an enlarged view of the upper end portion of the structure shown in Fig. 3 with certain parts sectioned.

Figure 5 is a perspective view of the outer end of the dipper-tooth base of the preceding figures.

Figure 6 is a perspective view of the dipper-tooth proper of the preceding figures.

Figure 7 is a perspective view of the terminal portion of a dipper-tooth base of modified construction.

Figure 8 is a perspective view of the tooth for cooperation with the base of Fig. 7; and

Figure 9, a view in side elevation of the assembled base and tooth of Figs. 7 and 8.

In Fig. 1 I have illustrated the relation borne by the dipper, represented at 10, to a bank, represented at 11, from which the material is to. be removed, the dipper being carried by a boom 12 and connected with lifting means 13 in accordance with common practice, such that the teeth, (one only of which is shown at 14) carried by the front section 15 of the dipper, are subjected in digging, to forces tending to tilt them on their support to the left in Fig. 1 which exerts shearing stresses at the connection between the tooth and its support, and it is therefore necessary to provide securing means for the teeth so disposed as to adequately resist these shearing stresses.

Referring to the construction shown in Figs. 1- to 6, inclusive, the teeth 14 are mounted, respectively, on bases one only of which is shown at 16, these bases being formed separate from the front section 15' of the dipper and overlapping the lip 17 thereof in which position they are secured, as by fastening devices passing through the openings 18 in the bases and the lip portion of the dipper, the bases shown being of common form except as to their upper seat-forming portions iamdl prra-nged in spaced relation along the The upper terminal portion of the base 16 is symmetrically tapered from opposite sides thereof as represented at 19 and 20 this portion of the base, which is slightly angularly disposed to the body of the base as shown, containing a recess 21 opening through the terminal end of the base with the extremities of its side walls recessed as represented at 22 to provide the tongues represented at 23, one side wall of the recess 21 containing a tapering groove represented at 24, this groove preferably inclining downwardly toward the front side of the tooth base as sented at 26, its lower edge portion being the arrangement of the parts being being extended upwardly to form undercut recess-extensions 31 into which the tongues 23 extend.

In accordance with the particular construction shown, the undercut recesses 31 are provided by recessing the tooth across the upper end of the web 30 and to points beyond the lateral faces of the latter.

The web of the tooth 14 contains in its opposite sides tapering grooves represented at 32 and 33, which are disposed preferably at right angles to the longitudinal axis of the.

tooth, these grooves opening into alining tapering openings 34: and 35, respectively, which open through opposite faces of the tooth as shown, one of said openings tapering toward one face of the tooth and the other thereof toward the opposite face thereof. The grooves 32 and openings 34 and 35 provided to receive a securing pin hereinafter referred to, are so disposed that when the tooth is seated on the base in one position one of the grooves 32 and 33 will extend parallel with, and directly oppose, the groove 24 and when applied to the base in reversed position the other of the grooves 32 and 33 will extend parallel with, and directly oppose, the groove 24. In either positionof the tooth the groove 24 and the one of the grooves 32 and 33 opposing it will form a tapered opening of circular shape in cross section at this part of the structure to receive the tapered securing pin representedat 36 which is inserted into the larger end of this tapered opening in the tooth and driven to the position shown in Fig. 2.

The pin 36 is thus caused to extend in such a position that the shearing stresses against the pin in digging are exerted laterally against the pin alon planes coincident with the longitudinal axls of the pin as distinguished from exerting these stresses against a comparatively small transverse area thereof whereby a pin of a given cross section which would be too small to resist the shearing stresses if the latter were exerted against them in a crosswise direction but which adequately resists the shearing stresses when exerted against it in accordance with my invention, may be used.

The stresses exerted laterally against the tooth are resisted primarily by the lapped portions of the web 30 and the nose portion 19 and the tongues 23 and the end walls of the recesses 31 lapped thereby.

The disposition of the pin 36 as shown is also of advantage as it is thereby rendered readily accessible for removal, when desired without obstruction from adjacent ones of the teeth.

The tooth 14 preferably, and as shown, is reversible on the base and in either of its two positions the securing pin is so disposed as to resist the shearing stresses in digging as above explained, the feature of reversely tapering the grooves in the tooth permitting of the driving of the pin to securing position in either of the two positions of the tooth.

The construction shown in Figs. 7, 8 and 9 is the same as that of the preceding figures except for slightvariations in proportions of the parts and the relationship of the Web on the tooth to the nose portion and the location of the securing pin. In this construc tion the web of the tooth, corresponding beyond the body of the tooth and into a recess 38 in the base 29 to the position shown in Fig. 9.

The Web 37 adjacent its outer extremity contains at opposite sides grooves represented at 39 and tapered in opposite directions, respectively, as explained of the grooves in the tooth 14 of Fig. 5. This grooved portion of the web extends into the recess 38 in the base 29, which latter contains a tapered opening 40 extending therethrough for receiving the tapered tooth-securing pin, such as in the pin 36, the opening 40 being so disposed that it is in the form of a tapering groove of semicircular shape in cross section where it traverses the wall of the recess 38 so that the pin driven into the hole 40 extends partly into the groove in this recess and the opposing groove 39 in the web 37.

The securing pin in this construction is thus so positioned that shearing stresses exerted against it in digging are resisted as explained of the pin of the construction of the preceding figures.

In both of the constructions shown the pin may be driven to position from the upper side of the tooth structure considering the dipper as laid down onits face or front portion. However, if desired, the tooth of igs. 4 and-5 may contain only one pin-receiving groove communicating with terminal openings and the front portion of the I dipper two oppositely tapering pin-receiving tions and those shown variously modified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is:

A dipper having a front portion containing a groove open at its opposite ends and having laterally spaced tongues at opposite sides of said groove, a tooth on said front portion having a web which extends into said groove, a surface of said web and an opposing surface of one of said tongues having registering grooves extending crosswise of said tooth and located substantially midway between the ends of said last-referred-to tongues and a pin extending lengthwise in said re 'stering grooves.

SCAR W. ANDERSEN.

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