US1340385A - Renewable cutting-tooth point - Google Patents

Description

w. L". EDMONDSUN. Y RENEwABLE CUTTING TooTH POINTl I APPI-.ICATION FILED JULY 29.1919.'

1,340,385. y Patented MayI8,192It).

'2 SHEETS-SHEET 2.

will/l l 1m' im I w l: A

WARREN L. EDMON'DSON, OF WASHINGTON, DISTRICT OF COLUMBIA.

RENEWABLE CUTTING-TOOTH POINT. i

Specification of Letters Patent.- A Patented lay 1S, 19.20.

Application filed .Tuly 29; 1919. Serial No. 313,978.

To all whom it may concern:

Be it known that I, lVARRnN L. EDMOND- SON, a citizen of the United States, residing at lVashington, in the District of Columbia, have invented certain newand useful lmprovements in Renewable Cutting-Tooth Points, of which the following is a specification.

This .invention relates to new and useful improvements in renewable cutting tooth points, and pertains more particularly to cutting points for use with ditching and grading machines and the like. i

The primary object of the invention is to provide a tooth which has a novel vform of detachable cutting point so lthat the vlatter may be easily and quickly removed when worn or otherwise incapacitated, and a new point inserted in its place. f

The invention further aims to provide `a point which involves a minimum of material, so that upon discarding thereof the resultant waste is reduced to the least possible, and at the same time to thus economize in the 'initial course of. production.

The invention further aims to provide a connection between the point 'and thev shank of the tooth which will eifectivelysupport the point and allow its disconnection and the connection of a new point, and which will also support the point so that the stresses imposed there upon will be assumed by the parts without likelihood of breakage.

Further and other 4objects will be later set forth and manifested in the course of the following specification.

In the drawings: y

Figure l, is a vertical sectional view taken through a bucket and showing the present invention applied to the bottom and a side of the cutting bar thereof.

Fig. 2, is an enlarged view of the bottom tooth in longitudinal section. Fig. 3, isa bottomplan view of Fig. 2.

Fig. 4, is a top plan view of the shank with the point removed.

Fig. 5, is a front 'end elevation of Fig. 4.

Fig. 6, is a side elevation of the cutting point. Y

Fig. 7, is a rear end elevation of Fig. 6.

Fig. 8. is an enlarged section on the line S-S of'Fig. 1.

Fig. 9, is atop plan view of the side tooth of Fig. 8 and,

Fig 10, is a section in a line 10-10 of Fig. 9. y

The invention is shown applied to a bucket B, having the usual substantially U-shaped cutting' blade Cat its front edge, and involves a shank il, which is secured to the cutter bar by means of bolts and nuts 2.

The forward portion' of., the shankkis .pro-

vided with a socket-like part 3,-.o`fisomewhat V-form so as to iwedgingly receiveV the cutting edge of the cutter bar C, as depicted in the drawings. The shank at-its` eXtreme frontend is formed to have an upper inclined face `4p, and rearwardly. and downwardly inclinedparts 5, the parts 4 and 5,

conj ointly f-ormilngasomewhat V-shape con-.

figuration-The inclined end face 4, is

V'formed with a .dovetail groove 6, centrally between itssides, and with a preferably slightly inclined shoulder 7, at the lower end of the groove, which shoulder is formed so as to provide a fiat abutting wall for a purpose laterset forth. This shoulder 7j, is at substantiallyl right angles to the longitudinal axis of the shank so as to have maximum resistive property as will be now described.

The removable cuttingpoint includes a body hai/ing an inclined upper face 8 and av fiat bottom 9, the two conjointly forming a somewhat V-shaped configuration, with the rear end of the face 8, extendingbeyond the inner end of the bottom 9. A dovetail projection or tenon 10, is formed on the rear of the inclined part 8, and at its lower end is extended and enlarged and provided with a depending foot 11, the latter shaped and formed so as'to abut the shoulder 7, while the inclined parts -5 ofthe shank 1 are engaged with downwardly and rearwardly inclined parts 12-12, Shaped to form a close' or tight fitting joint with said inclined parts 5. The parts 19., 12, aredisposed on opposite sides of the foot 11,|and -are of greater length than the latter and of greater inclination than the foot extending beyond the rear of the latter. The tenon actsto reinforce the cutting point, while the foot 11, functions t'o also reinforce the bottom part 9 of the point. The foot l] is thus backed by a conabutting the shoulder 7 the latter will, due to its vertical dispositien assume all longitudinal thrusts or stresses to which the point is inherently subjected in the per? applied to the bottom of the cutterv bar, so

that the point will extend outwardly of the outer face 14 of shank'l as depicted in Fig. 8 of the drawings, the face lll'of. shank l being curved so asto merge into; the outer' face 9 of the point.

l larity differing from that of the shoulder,

clined In both forms ofthe invention, the point and the shank are formed .with registering openings through which a rivet l5 is passed, the rivet being inclined and having its ends headed and countersunk into the point and shank as shown.,` This rivet functions to prevent disengagementofthe point. from the shank by sliding of the point, and is not subjected to any of the stresses or strains imposed upon the'point during working of the latter. ther noted the opening in the point for the reception of the rivet 15 extends through the dove-'tail projection 10, so that the point is not appreciably weakened.

It will be apparent' from the foregoing that all thrusts imposed upon the point end- Awise thereof willy be taken up not only by the central shoulder 7 but also by the inarts 5l which are disposedone on each si of the shoulder and have an anguthe latter and-the parts 5-5 ybeing engaged 4-loy the foot 11 and thelparts'12-12 respec- 'tively In additionlateral thrusts or strains imposed upon the point will be taken up in part by the dove-tail tenon 10.

AIt will further'be seen from the foregoing that thedtooth as well vas the shank are devoid of any frail or weak portions which are likely to become broken or fractured or otherwise rendered unserviceable in use.

By referring to Fig. 1. it will be seen that the joint formed between the parts z'. e. point and shank, extend intothe point so that the latter is provided with an upper part of equal thickness, and with corresponding strength. Further the wall 12- is short so as to require a minimum of material `in the manufacture of the point, and consequentlyl the point can' be used down to the part marked X in Fig. l, so that upon discard of the point the least wasted. What is claimed is 1. In a ytooth for ditching machines and the like, a shank .having a downwardly andA outwardly inclined upper face formed with In this regard it will be fur' possible material is the tenon and beyondthe outer face thereof a dovetail groove centrally between its sides and formed with downwardlyand rearwardly inclined parts on opposite sides of the groove with a shoulder at and extendinfr across the lower end of the groove, said shoulder being substantially at right angles -to the longitudinal axis of the shank, a removable cutting. point having a bottom wall,

an inclined front fa'ce, and a dovetail prothe like a shank having a substantiallyV V-shaped endfformed with a groove, said groove forming a transversely central shoul` vto der at the lower end thereof which shoulder is substantially 'at right angles to the longia tenon received in the groove and having a '3. I n a tooth for ditching 'machines and thev like,v a shank having a substantially vV-shaped end formed with a groove which .latter extends throughthe upper .face and the apex of the V-end so as to form an abrupt shoulder at the apex and a cutting point having a tenonon its rear received in said groove, said tenon being extended.v

downwardly and enlarged at its lower end and formed with a foot to abut the Vshoulsides of the foot' to engage the lower face of the V-end .of the. shank, said'parts being oil greater length than the foot and extendin ,toward the cutting point of theft'eeth an l rearwardly beyond the rear end of the vfoot;

4. In a tooth .for Yditching machines and the like, a -shank having a` groove andan abrupt shoulder at the base of the groove,

and depending therefrom, anda cuttingv der and havingl a pair ofparts on opposite point ofthe same width as lthat of the shank' seated on the latter and having a tenon on its under face receivable in the groove and having a footextending outwardly from to engage the `shoulder-.

5. VIn a tooth for'ditching machines and the like, a shank having a groove arranged at al1-incline tothe shank and ashoulder at the. base of the groove, cutting point havment on the tenon at the bottom end thereof ing downwardly and rearwardly extending between saidparts, said enlargement being side prts underlapping the bottom ofthe shapedtoconformably engagesaid shoulder 10 groove, and abutting the end parts of the and having a different inclination from that 5 -shank on .opposite sides of the groove, a. of the said end parts of the cutting point.

tenon on the rear face of the point extending l In testimony whereof-I aiiix my signature. upwardly from 'said parts, and an eniarge- WARREN L.'EDMONDSON.

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