US2678741A

US2678741A - Earth moving apparatus

Info

Publication number: US2678741A
Application number: US185841A
Authority: US
Inventors: John S Pilch
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-09-20
Filing date: 1950-09-20
Publication date: 1954-05-18
Anticipated expiration: 1971-05-18

Description

y 18, 1954 J. s. PILCH 2,678,741

EARTH MOVING APPARATUS Filed Sept. 20, 1950 Summer JOHN S. 'PILCH 7 Z Clttomcg UNITED STATES E ATENT OFFICE;

EARTHMOVING APPARATUS J ohn S.iPilch', Wares-Mass Application September20, 1950.1 Serial No.-1s5.su 1 Claim; (01. 214 -138).

to newand improved features adapted for-use: with a tractor carried apparatus such as'thc back hoe set forth in my application filedNovem her 14, 1949,- Serial Number 127,170.

It is anobject of the present invention-to provide mountings and connections for dipper stick operating jacks which, provide for alternative connections near the upper or'lower end of the stick; Thus, said jacks may be converted from push to pull jacks by a mere removalofitwo pins without disconnecting. supply lines to the dipper stick jacks.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts without departing from the scope of the invention as set forth in the accompanying claim as the preferred forms have been given by way of illustration only.

Referring to the drawings:

Fig. l is a side view of a bucket and its operating arrangement constructed according to the invention;

Fig. 1A is a top or plan view of the construction shown in Fig. 1.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, there is shown in Figs. 1 and 1A an arrangement wherein I is the supporting structure on the tractor to which is pivotally connected the boom H at pivot point [2 adjacent the lower end of support 10. On this arrangement a dipper stick I3 is pivotally connected at M to the free end of boom H.

Boom H is supported by cylinder and ram l6 which is connected to a double acting piston within cylinder 15. Cylinder I5 is pivotally connected at I! to support l0 adjacent its upper end and ram 16 is pivotally connected at its free end at l8 to boom ll.

Cylinder l5 has the hydraulic lines l9 and 29 connected thereto adjacent its opposite ends and adapted to supply hydraulic fluid under pressure from a hydraulic system carried by the tractor as set forth in said application Serial Number 127,170.

On the upper end of dipper stick !3 is secured bracket 2| to which is pivotally mounted cylinder 22 at 23. Cylinder 22 has the

hydraulic lines

24 and 25 connected thereto adjacent its opposite ends and adapted to actuate a double acting pis- I ton within saidcylinder 22 and ram 25 is nected to said piston.

A pair of twin cylinders 21 are .iprovidedfone on each "side of boom H and "said cylinders '21,: only one of which can be seenin Fig."1, ,and these-cylinders are pivotally connected to boonij H at a. Within each ofsaid cylinders 21' isa double acting pistonhaving the rams 28' con'-" nected'thereto and each of said cylinders 21 have the hydraulic lines 32- and 33 connected'thereto adjacent the opposite ends-of said cylinders.

The rams 28 each may'be pivotallyiconnected at 34c to'dipper stick '!3 or at points'34' andysaid pair of twin cylinders-21 and rams 28 are adapted to move dipper stick l3 about its pivotalbon nection M with boom H, and thereby actuate trencher bucket 38.

In this construction bucket 38 is connected to ram 25 through a linkage arrangement consisting of link 39 which is pivoted adjacent its opposite ends to bucket 38 and link 49 at M and 42 respectively and said link is pivotally connected to ram 25 at 43 and at 44 to a pivotal connection on dipper stick I3.

In Figs. 1 and 1A a trencher bucket is shown.

A skirt or guard 58 is provided on either side of dipper stick l3 to prevent injury or damage to ram 28.

This construction allows the changing of cylinders 21 and rams 28 from the position shown in Fig. 1 to a position wherein the rams 28 are each connected to one of the supports 34 without the necessity of changing the hoses in the field which for obvious reasons is undesirable.

Due to the fact that cylinders 21 need necessarily be fairly large for reasons of strength and displacement purposes to allow a fairly quick return of the dipper stick into normal digging position, it would, therefore, naturally have a considerable or great amount of power when pushing on the piston connected to ram 28. Therefore when the device is used as a loader it is satisfactory if used in the position shown in dotted lines in Fig. 1, that is, with rams 28 connected at points 34. If, however, it is desired to employ the device as a trencher bucket, it would be necessary to pull in on the piston to derive power for trenching and due to the fact that the displacement is smaller on this side, since the ram takes up considerable space in the cylinder, there would be relatively little power for digging or trenching and the device would have a relatively slow return which would not be satisfactory for rapid operation.

By connecting rams 28 at point 34a, which does not require any changing of hoses or other change unless desired, except the changing of ram 28 from points 34 to points 34a which only requires the changing of the two pivot pins, the operator then has the proper amount of power in the right direction for trenching and still has a high speed return of the dipper stick in the opposite direction.

In brief, this construction allows adjustment for best operation for loading or trenching with only the necessity of changing the connections of the rams so as to provide greatest hydraulic force for trenching or loading as well as speeding up the return of the bucket, thus speeding up the operation of the device without the necessity of any changes except the changing of the points of connection of the dipper stick operating rams.

With a single large cylinder l5 for operating boom 1 I, as shown in Fig. 1, the twin cylinders 21 can straddle boom H and thereby provide a neater, more compact and more efficient device.

With the bucket operating linkage described above, the linkage is so arranged as to provide the greatest power when needed, that is when the door and bucket approach, and to get higher speed when the bucket is fully opened, thus both greatest speed and greatest power are obtained when they can be used to best advantage. Also by varying the hitches of the linkage the speed and power obtainable may be varied.

From the foregoing it will be seen that I have provided simple, efiicient and economical means for obtaining all of the objects and advantages of the invention.

Having described my invention, I claim:

In a device of the character described, a support, a boom member pivotally connected to said support, a dipper stick member pivotally connected intermediate its ends to said boom member, a pair of cylinders and rams, said cylinders and rams being disposed on opposite sides of said boom and being connected adjacent one end to said boom and adjacent their opposite ends to said dipper stick member adjacent one end thereof for actuating said dipper stick member, alternate connecting means adjacent the opposite end of said dipper stick for attachment to said cylinders and rams and a single cylinder and ram positioned between said pair of cylinders and rams and having one end connected to said boom member and connected to said support adjacent its opposite end for actuating said boom member.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date D. 162,873 Pilch Apr. 10, 1951 2,220,267 Nelson Nov. 5, 1940 2,303,852 Linn Dec. 1, 1942 2,418,251 Drott Apr. 1, 1947 2,451,101 Leschinsky Oct. 12, 1948 OTHER REFERENCES Advertising circular of Sherman Products, Inc. Form SP54'7, copy recd Div. 4, June 12, 1950, pub. early summer 1949. 4 pp.