Dipper stick extension

Aug. 13, 1957 d. f. przybylski 2,802,584

DIPPER STICK EXTENSION lost 2 Sheets-Sheet 1

Filed Aug. 24, 1953

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Aug. 13; 1957 d. f. przybylski 2,802,584

DIPPER STICK EXTENSION

Filed Aug. 24, 1953 ² Sheets-Sheet 2

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2,802,584

Patented Aug. 13, 1957

United States Patent Office

The dipper stick 18 is swung relative to the boom 11 by a hydraulic ram 21 that includes a cylinder 22 and a cooperating piston, not shown, having a piston rod 23. On the outer end portion of the piston rod 23 is a head 24 that extends between a pair of ears 25 that extend below the dipper stick 18 and said head is attached .to the ears 25 by a pivot pin 26. In actual use, the cylinder 22 will be pivoted to the boom 11. The ears 25 are, as shown, flat plates that overlap the dipper stick 18 on opposite sides and are detachably secured thereto by four nut-equipped bolts 27. These bolts 27 extend through aligned holes 28 in the ears 25 and the dipper stick 18. As shown, there are sufficient holes 28 in the dipper stick 18 to permit three different adjustments of the ears 25 longitudinally of said dipper stick.

The numeral 29 indicates a back hoe bucket as an entiretv except for two large laterally spaced ears 30 fixed to the back of said bucket at its transverse center and project rearwardly therefrom in the plane of the bucket 29.

Referring now in detail to the invention, which also includes the adjustable ears 30 which is an extension 31 of the dipper stick 18. The purpose of this extension 31 is to permit the bucket 29 to dig deeper and work closer to the machine on which the assembly shown in Fig. 1 is mounted.

The extension 31 comprises a pair of large flat substantially rectangular superimposed plates 32 between which the ears 30 project. The extension plates 32 at 30 their lower right-hand corner portions are pivoted to the lower portions of the ears 30 by a nut-equipped bolt 33 that extends through aligned holes 34 and 35 in said plates arid ears, respectively, and hold the plates 32 clamped against the ears 30.

The dipper stick 18, at its outer end portion, extends between the extension plates 32 and is pivoted thereto by a nut-equpped bolt 36 that extends through aligned holes 37 in the lower left-hand corner portion of the plates 32 and the head 38 on the outer end portion of 40 the dipper stick 18. This head 38 acts as a spacer for the extension plates 32, Fig. 2.

The extension plates 32, at their upper right-hand portion, are adjustably secured to the dipper ears 30 by a ,_wu m χικ. 1, nut-equipped bolt 39 that extends through aligned holes of the exten- 45 40 in the plates 32, at their upper right-hand corner portions, and the right-hand pair of holes 41 in the dipper ears 30. As shown, there are three pairs of holes 41 in the bucket ears 30 circumferentially spaced about the _illuvvu iu ± «ο x — ., axis of the pivot bolt 33. The purpose of this adjusttaken on the lines 7—7 60 ment of the plates 32 relative to the bucket ears 30 is to change the pitch of the bucket 29 relative to the extension 31. It will be noted that the adjustment of the plates 32 relative to the bucket ears 30 corresponds to the adjustment of the ears 25 relative to the dipper 55 stick 18.

The bucket 29 is tilted relative to the dipper stick 18 by a hydraulic ram 42 comprising a cylinder 43 and a cooperating piston 44 having a piston rod 45. A head 46 on the outer end of the piston rod 45 extends between by” a” nut-equipped bolt 47. This bolt 47 extends through aligned holes 48 in the upper left-hand corner portions of the extension plates 32 and the piston rod head 46 which acts as a spacer for said plates.

Formed in the extension plates 32 above the holes 40 and 48 are holes 49 and 50, respectively, for a bucket having ears different from the bucket ears 30. Fig. 6 shows one of the plates 61 of a dipper stick extension for increasing the operative length of the dipper stick 18 over 51 are given the same reference numerals as the corresponding holes in the plate 32 followed by a prime.

2,802,584

DIPPER STICK EXTENSION Daniel F. Przybylski, Winona, Minn. Application August 24, 1953, Serial No. 376,105 5 Claims. (Cl. 214—138)

My present invention relates to improvements in dip- 1 per sticks for loading buckets, half-shell buckets, back hoe buckets and the like.

The primary object of this invention is to provide a novel extension for a dipper stick to increase the oper- , ative length thereof.

A further object is to provide interchangeable and usable extensions for dipper sticks to vary the operative length thereof. . . .

A still further object is to provide an extension tor a dipper stick for holding a bucket in different pitch relation to said extension.

These and other objects of the invention will be apparent from the following description, reference being had to the drawings.

To the above end, generally stated, the invention consists of the novel devices and combination of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a side elevational view of the invention embodied in a digger back hoe bucket assembly;

Fig. 2 is a plan view of the invention and the back hoe bucket as shown in Fig. 1;

Fig. 3 is a fragmentary detail view in side elevation of the rear end portion of the back hoe bucket, Fig. 4 is a fragmentary detail in plan looking at the dipper stick, as indicated by the arrow shown in Fig. 1;

Fig. 5 is a side elevational view of one cf the —— sion plates shown in Fig. 1; .

Fig. 6 is a side elevational view of one of the side plates of the dipper stick extension having a longer operative length from the extension shown in Figs. 1 and 5;

Figs. 7 and 8 are detail views taken in the line: .7 and 8—8, respectively, of Fig. 1, on an enlarged scale; and

Figs. 9 and 10 are views corresponding to Fig. 1 but somewhat more fragmentary on an enlarged scale, and in place of the back hoe bucket show, respectively, a loading bucket and a half-shell bucket.

Referring first to the invention shown in Figs. 1 through 6, the numeral 11 indicates a boom, only the front end portion being shown. A hydraulic ram 12^ is provided for raising i._.' ' ~ a cylinder 13, a cooperating piston, not shown, having a piston rod 14. In actual use, the boom 11 and the ram 12 will be pivoted to a turnpost or other support, not shown. The piston rod 14 at its outer end portion is provided with a head 15 that extends between a pair of 65 upstanding ears 16, fixed to the outer end portion of the boom 11, and attached thereto by a pivot pin 17.

A dipper stick 18, that is rectangular in cross-section, has on its outer end portion a pair of depending ears —-------=-----. ~ . -- . , between which the boom 11, at its outer end portion, 70 that of the extension 31. The holes m the extension plate extends and is attached to said ears by a pivot pin 20, to swing in the plane of the boom 11.

2,802,584

The cylinder 43 has on its rear end a pivot base 52 that extends between a pair of upstanding ears 53 fixed to the rear end portion of the dipper stick 18 and is attached thereto by a pivot pin 54.

Referring new in detail to the invention shown in Fig. 5 9, the invention is embodied in an assembly corresponding to that shown in Fig. 1 except a loading bucket 55 is substituted for the back hoe bucket 29.

Parts, shown in Fig. 9 that correspond to like parts shown in Fig. 1 are given the same reference numerals 10 followed by the letter a. The bottom member 56 of the bucket 55 is hinged to open outwardly and is held closed by a latch 57. Fixed to the back of the bucket is an upper pair of ears 58 and a lower pair of ears 59, only one of each being shown. la

The extension 31^a is attached to the bucket ears 58 and 59 by the bolts 39^a and 33^a, respecively. It will be noted that the bolts 39^a and 47^a extend through the uppermost holes in the extension plates 31^a.

Referring now in detail to the invention shown in Fig. 20 10, the invention is embodied in an assembly corresponding to that shown in Fig. 1, except a half-shell bucket 60 is substituted for the back hoe bucket 29. This bucket 60 has a large pair of rearwardly projecting ears 61, only one of which is shown. 25

Parts in Fig. 10 that correspond to like parts in Fig. 1 are given the same reference numerals followed by the letter b. The extension 31^b is attached to the ears 61 in the same manner in which the extension 31 is attached to the ears 30. 3θ

While there are herein disclosed but a limited number of embodiments of the structure, process and product of the invention herein presented, it is possible to produce still other embodiments without departing from the inventive concept herein disclosed, and it is desired, there- 35 fore, that only such limitations be imposed on the appended claims as are stated herein, or required by the prior art.