US1710985A - Excavating-bucket-forming machine - Google Patents

Description

April 30, 1929. A. J. JACOBSENl l EXCAVATING BUCKET FORMING MACHINE Filed Jan. 3l, 1927 2 Sheets-Sheet a: n. ..4 v N APll 30, 1929- A. J. JAcoBsEN 1,710,985

EXCAVATING BUCKET FORMING MACHINE led Jan. s1. 1927 2 sheets-sneer 2 E Patented Apr. 3o, 1929.

UNITED STATES PATENT OFFICE.

ARTHUR J. JA'coBsEN, or CHICAGO, ILLIN ors, AssreNoa, BY MESNE ASSIGNMENTS,

' PQRATION 0F ILLINOIS.

EXCAVATING-BUCKET-FORMING MACHINE.

Appucation 1aed January s1, 1927. semi No. 164,819.

This invention relates to a machine and method for forming the buckets of excavating machines.

In the manufacture of heavy buckets of the character which may be formed by the apparatus herein described, it has been customary to make up buckets by riveting togetherv a plurality of suitably .cut and formed steel plates Jfor the bottom, sides and ends of the bucket rather than to form the buckets from a single blank, due to the fact that forming machines now available are not well adapted for bending blanks into the peculiar .formaltion required in the` bucket. 'l he object of the present invention is to provide a machine and method which are suitablefor bendinga single cut blank into the shape required for forming the bottom sides and end of the bucket.-

An illustrative embodiment of n a blank adaptablefor use, and `of a machine capable of readily carrying out the improved method of forming such excavating` trated in the accompanying drawings, wherein: y

Figure l is a front elevationy of the machine, the side forming members thereof be ing also shown in a different position in dotted lines. A y 1 Fig. 2 is a side elevation of the machine,

the side` tori'nmg members being shown inl lifted position. j y

Fig. 3 is a plan view of a sheetmetal'blank which is formed into an excavatingbucket by the machine. i f r Fig. 4 is a plan view of a yoke used in forming the end of the excavating bucket.

In carrying out the present invention, a single suitablyfcut steel plate, for example, one-half inch in thickness, is placed upon an anchored form and secured therein by clamp# ing means which, if desired, may serve to somewhat curve the plate along a center line thereof in case such curvature is desired at the bottom of the finished bucket, Then the sides ofA the bucket are brought into the proper relationship with thek bottom by alifting action on wings of the unbent blank. Another projecting part of the bla'nkis rolled upwardly into position to formthe curved back .of the bucket. The sides and back of the bucket are then securedin this position by angle irons riveted thereto.

buckets is illus The machine and method provide a simple means of bending a plate metal blank into the ultimateform of the bucket.

A steel plate blank l from which the bucket is formed comprises the ears 2 with their helices 3, lobes 4L and the integral medial porvtion 5 vwhose head 6 projects considerably past said helices. The blank has a plurality of marginal rivet apertures 7. The medial portion of the blankis provided with dual apertures 8 and other apertures 9 near the inner edges of the ears. Eachear hasan aperture l0 equidistantfrom the marginal edge of the helix of each ear. j

In the construction illustrated in the accompanying drawings a fixed base member 11, such as steel plating, is rigidly secured to the upper ends of a plurality of I-beams 1'2, the lower endsrofI which are embedded in a concrete 'foundation 13. y j

The formingmachine has a pairV of tem-V plets or dies 15 having inwardly declining surfaces 16 adapted to support the medial portion of the blank.

A clamping bar 17 isvdisposed longitudinally with respect to the length of themedial rportion of the blank and has apertures 1S which register with the dual apertures -the blank. Bolts l9,owl1ose heads 2() are fast Sof with the fixed base 1.1 project upwardly and u are positioned to registerwith the apertures S in the. blankand the apertures 18 inv the clan'iping-bar. T he blank is placed upon thc tcniplets 153 inamanner whereby the upwardly projecting bolts 19 project through the registering `apertures 8 and the clamping is then similarly placed up on the blank. The nuts 21 are thenk tightened to effect ther concave surface 2Q of the medial portion of the blank. A second pair of templets 23 have under surfaces 24 corresponding in contour to the upper surfaces I6 ofthe templets 15.

kEach set of templets" 23 has Vregistering apertures 24 which likewise register with the apertures in the blank. Bolts 25 are passed through these apertures and the nuts Z6 are used to secure the templjet sets together.Y A.

spreader 27 is used to retain the telnplet pairs in properly spaced relation.

A pair of laterally disposed wingslQS are hinged to the fixed base 11 through the medium of the brackets 29 secured to the fixed bar base by the bolts 30. Each wing has a pair ot levers 3l rigidly secured thereto, as by the rivets 32, the inner ends of said levers being ifixed4 apart adjacent the hinged side of the wings. rlfhe outer ends of the levers approach each other and carry a pulley 33 therebetween. Cables 34 are carried on said pulleys and suitable power, such as a lifting crane (not shown) may be hooked np with said cables .tor drawing the wings upwardly to forni the sides 35 of the bucket. It will be noted that the templets :23 have arcuate outer sides 3G. In forming the sides of the bucket, the ears ot the blank may be bent past the perpendicular in order that the sides, in their 'tei'ideiicii to springl back, mayV spring back substaiitially perpendicularly. n

In Yloi-ming the end 37 of the bucket, .a yoke S38 carrying a transverse roller 39 is Vdetachably secured to the formed side members by passing pins Ll through the apertures l() which` register with the apertures 4l at the ends oiE the yok. In securing the yoke to the sides of the bucket, the roller 39 is disposed under the inner end of the part 6 of the blank. The head oi. the yoke carries a pulley 42 and a cable 43 runs on the pulley. Suitable power may bevexerted on the cable for lifting the yoke whose roller thereby 'forms the end oi the bucket by curving the part G, the axis ot the curve being at pins i-O. Gussets or arcuate angle iron reinforcing means are used to connect the meeting edges ofthe sides and end of the bucket.` Y

The fixed base 1l is provided with a series oi scaled apertures whereby the templets and Q3, and brackets 29 may be laterally shitted so that buckets of various sizes may be formed.

Vilhile but one specific embodiment ot this invention has been herein shown and described'` it will beunderstood that numerous details of the construction shown may be altered or omitted without departing trom the spirit ot this invention as defined by the following claims.

I claim:

l.' In a machine ot the character described, a base having` a member for receiving a plate metal blank thereon, a second member `in clamping relation to said first member and tor securing said blank in position therebetween, a forming member hinged to said base `member for bending a side ot said blank, and

a pivoted yoke carrying a cross member and arranged to be detachably mounted on the bent sides of said blank for curving another side thereof.

2. In a machine of the character described, a base member, templets detachably secured to said base `member and a plate metal blank therebetween, a pair of laterally disposed wings hinged to opposite sides of said base member for bending opposite sides of said blank, and a yoke carrying a transverse roller and arranged to be detachably pivoted to the bent opposite `sides of said blank and for forming the end` of said blank by means of said roller.

3. In a machine for forming excavating` buckets from metal blanks, a Vfixed base menibei', templets detachably secured to said base member and for securing a blank therebetween, a pair of laterally disposed wings detachably and liingedly secured to said base member for forming' the sides of said bucket, and a pivot-ed yoke carrying a cross member for forming the end of said bucket.

4. In a machine of the character described a base member, means on said base member for1 bending opposite sides of a blank, and a yoke carrying' a cross member and erranti d to bedetachably pivoted to the bent opposite sides oi: said blank for forming the end thereot by means of said cross member.

5. In a machine etv the character described a base member, upper and lower dies detachably mounted on s aid base member. means for clamping the blank between the upper and lower dies, forming mechanism on the base member `for bending the opposite sides offsaid blank relative to the dies, and means arranged to be pivoted to the opposite sidesoii said blank for `forming the end thereof.

6. In a machine of the character described, a base member, a pair of spaced apart die elements on said base member, means secured to the base member between said die elements 'for clamping the blank to the upper surface thereof, a pair oiLl spaced ripper die elements engaging the upper surface of said blank. a .spacing member extending between the upper die elements retaining the saine in spaced relation. a clamping means comprising bolts extending 'tl'iroiigh registering apertures in the base, the dies and the l lank 'l'or securing the upper die elements to the blank to provide bearing means for the sides of the blank during bending thereof.

Signed at Chicago this 27th day of January, 1927.

. ARTHUR J. VV.IACOBSE1`T-V

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