US3042122A

US3042122A - Air and oil pressure recoil mechanism for plows

Info

Publication number: US3042122A
Application number: US762491A
Authority: US
Inventors: Peter B Anderson
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-09-22
Filing date: 1958-09-22
Publication date: 1962-07-03
Anticipated expiration: 1979-07-03

Description

July 3, 1962 P. B. ANDERSON 3,04

AIR AND OIL PRESSURE RECOIL. MECHANISM FOR PLOWS Filed Sept. 22, 1958 INVENTOR 3,942,122 Patented July 3, 1962 3,042,122 AIR AND OIL PRESSURE RECOIL MECHANISM FOR PLOWS Peter B. Anderson, P.0. Box 40, Southey, Saskatchewan, Canada Filed Sept. 22, 1958, Ser. No. 762,491 2 Claims. (Cl. 172-265) This invention relates to an air and oil pressure recoil mechanism for plows and is a continuation in part of my United States patent application for Air Operated Recoil Mechanism for Plows Serial No. 571,463 filed March 14, 1956, such application now having been abandoned.

An important object of my invention has been to provide shock absorbing means wherein the downward working pressure applied to a plow beam or shank is reduced by the action of my mechanical pressure controlling arrangement as the beam or shank is forced upward.

A further object of my invention has been to use oil and air under pressure over a piston in a cylinder to re ceive the shocks a plow beam is subjected to when in collision with stones and the like while in operation.

Other objects and advantages inherent in my invention will be apparent from the following description of an embodiment thereof and the appended drawings wherein:

FIGURE 1 is a vertical view in elevation of the left side of my plow beam and shock absorbing assembly illustrating the plow shovel contacting a stone under the sur face of the ground.

FIGURE 2 is a vertical left side view in elevation taken on a line 4-4 of FIGURE 1 illustrating the plow beam raised up until the shovel has cleared the stone.

FIGURE 3 is a vertical rear or back view in elevation of my air and oil pressure recoil mechanism for plows in assembly with a plow beam.

FIGURE 4 is a vertical central section in elevation of my air and oil cylinder taken on a line 4-4 of FIG- URE 1 illustrating the cylinder base and the piston and piston rod, and the rubber compression ring in the piston ring groove and the rubber buffer between the said piston and the base plate, and the cylinder head in assembly with the curved end of the cylinder supporting column, and the cylinder head gasket and base plate supporting rods.

FIGURE 5 is a vertical inclined left side view in elevation of the upper end portion of my plow beam illustrating the plow beam piston rod actuating arm projecting from the back of the beam and welded to the plow beam at one end and having an aperture through its other end, and a left side spool integral with and adjacent the upper and forward end of the beam and an aperture through said spool and beam.

FIGURE 6 is a top plan view in elevation of the hammerheaded end of the plow beam illustrating a spool welded to either side of the forward end of the beam.

Like reference numerals refer to like parts throughout the specification and drawings, and like characters refer to like conventional parts.

Referring to the drawings, an air and oil pressure recoil mechanism for plows according to my invention is an improvement in the construction and operation of shock absorbing mechanisms for plows.

Construction FIGURES 1, 2 and 3 illustrate the several parts of the plow mechanism in combination, and the method of attaching the plow mechanism to a conventional plow frame cross member A.

The beam 20 has two metal spools 21 welded to its forward or upper end, as seen in FIGURE 6, which makes the beam appear hammer headed, and hence will be termed a hammerheaded beam 20. The hammerhead 20a of the beam 20 has an aperture 22 through said hammerhead 20a to receive a cross pin 23, seen in FIGURE 3. There are two arms or bosses 24 Welded to the cross frame member A, and they are spaced apart to receive the hammerheaded end 20a of the beam 20, and the said arms 24 have apertures 25 through their ends to receive the cross pin 23, and the pin 23 is positioned in the

apertures

22 and 25, thus retaining the beam or shank 20 in rockable position between the arms 24. On the back of the heammerheaded beam 20 is welded an arm or lug 26, seen in FIGURES l, 2, 3 and 5, and the arm 26 has an aperture 27v in its outer end, seen in FIGURE 5, and the clevis 28 of the piston rod 29 spans the. end of the arm 26, and a clevis pin 30 is positioned through and in the

apertures

31 and 27, thus connecting the beam 20 to the piston rod 29, and the piston rod 29 is slidably positioned in the piston rod circumferential bearing 3'2, seen in FIG- URE 4, and the piston rod 29 passes through the center of a rubber piston buffer 33, seen in FIGURE 6, and is secured to the center of the piston 34 either integrally or otherwise. The cylinder 35 and assembly comprises a circumferential cylinder base 36 having a circumferential flange 37 accurately machined to receive one end of the piston cylinder, which is machined to a slidable or push fit within the flange 37 in order that the cylinder 35 and base 36 and cylinder head 38 be maintained in symmetrical position. The cylinder head 38 and the base 36 have projecting circumferential flanges, designated by 39 and 40, which have a plurality of rod receiving apertures 41 equally spaced through and around said flanges, and a plurality of rods 42 are positioned in the apertures 41 having nuts 42a in order to draw the cylinder head down on the gasket 43 and simultaneously clamp the cylinder 35 between the cylinder base 36 and cylinder head 38; the cylinder head 38 has two lugs 44 and the upper curved end 4511 of the column 45 is positioned between the lugs 44, and a pin 46 connects the cylinder head 38 to the curved head 45a of the column 45. This whole assembly of the piston mechanism is plainly illustrated by FIG- URE 4 of the drawings. .The base of the column 45b is welded to the conventional cross member A and the beam stop 47 is Welded to the column 45. The piston 34 has a ring groove 48 to accommodate a rubber compression ring 49. An air valve 59 is positioned in the top of the cylinder 35 seen in FIGURE 4. A tillage shovel B is bolted to the bottom end of the beam 20 by one or more bolts C.

Operation The plow is travelling in the direction indicated by the arrow F, and the shovel B on the end of the plow beam 20 has collided under the surface of the ground G with a stone D seen in FIGURE 1, and FIGURE 2 illustrates the plow beam 20* with the shovel B raised up to allow the beam shovel B to ride over the stone D, and during the upward travel of the beam 20 the beam arm 26 has shoved the piston rod 29 and piston '34 upward against the air and oil pressure within the cylinder 35. When the shovel B has cleared the stone D, the downward pressure of air on the piston will return the plow beam 20 and shovel B downward into operative position. During the foregoing movements, the air pressure within the cylinder received the shock from the plow beam 2d caused by the shovel B striking the stone D. An important functioning of this invention different from the prior art is that as the shovel end of the beam 20 is being forced upward against the downward pressure of the piston rod 29, which piston rod is in turn forced downwardly by the piston 34 which is under air and oil pressure, the beam travels in a semi circular movement while being forced upward, and as the beam 20 and arm 26 swing upwardly against the pressure from the air operated piston the beam 20 gains an advantage over the downward pressure of the piston as illustrated in FIGURES 1 and 2. Note the semi circular line 56 and that the piston operating arm 26 has travelled along this line 56 from a point 54 until the arm 26 was stopped by the stop 47, and during this upward movement of the beam 20 and the arm 26 the downward pressure of the piston to the shovel end of the beam 20 progressively becomes less as the beam or shank 20 rises, and when the beam or end of the arm 26 on its upward travel has reached a point on the line 26 designated by 51 the shovel end of the beam 20 has already gained a substantial leverage on the downward pressure of the piston thrust to the end of the beam arm 26, and in order to more clearly visualize this fact note the length of the dotted line 53 in FIGURE 1 when the beam 20 is down in operation and receiving the full power or pressure from the piston, then note the length of the dotted line of leverage 52 which is less than half the leverage the piston has on the shovel end of the beam 20 as shown by the dotted line 5 3 in FIGURE 1. The dotted line 55 seen in FIGURE 2 indicates the direction of piston rod downward thrust as it meets the line 52, to further explain the much less leverage or power the piston has on the shovel end of the beam 20 when the beam is up as illustrated in FIGURE 2. The shovel end of beam 20 receives the maximum. Working pressure when in operative position. While the illustrations of the cylinders 35 in the drawing had to be made short, it is to be understood that the cylinders should be much longer in order that the piston 34 on its upward travel will increase the air and oil pressure but very little. I use oil and air pressure, not hydraulic fluid in the cylinders 35 and the air is pumped into the cylinders through an air valve 50' seen in FIGURE 4. The beam 20 may be called a T or hammerheaded plow beam.

It will be understood, of course, that modifications may be made in the preferred embodiment of the invention described and illustrated herein without in any way departing from the spirit and scope of the invention as defined by the appended claims.

Having thus described my invention, what I claim and desire to protect by Letters Patent of the United States is:

1. In a soil working plow structure including a cross frame member, and having a cylinder adapted to receive and retain therein air under pressure and including a piston for the cylinder and a piston rod connected therewith, arms fixed on the cross frame member projecting rearward and downwardly inclined, a shovel carrying plow beam having its upper end attached to the cross frame member arms pivoted to move vertically, said plow beam having an integral arm rearwardly projecting therefrom, an upstanding column fixed on the cross frame member, means pivotally suspending the cylinder from said column, and means pivotally attaching the piston rod for the cylinder to the plow beam arm, said cylinder when the piston rod is so attached inclining rearwardly from the vertical when the shovel carrying plow beam is in working relation to the soil with said cylinder movable towards the vertical when the plow beam moves upwardly, and with the leverage exertable on the piston rod by the plow beam through the integral arm thereon decreasing as the pressure within the cylinder of air compressed by the piston increases.

2. A plow beam structure as set out in claim 1 in which when the shovel on the plow beam is in working relation to the soil the pivotal connections of the plow beam and cross frame member and of the piston rod and plow beam arm are substantially on a horizontal level.

References Cited in the file of this patent UNITED STATES PATENTS 1,046,090 Liebau Dec. 3, 1912 1,398,859 Hurtig et a1 Nov. 29, 1921 1,692,035 Gruss Nov. 20, 1928 2,228,865 Bird Jan. 14, 1941 2,379,779 Ash July 3," 1945 2,405,980 Sands et a1. Aug. 20, 1946 2,679,793 Rolf et al. June 1, 1954 2,690,111 Altgelt Sept. 28, 1954 2,850,956 Rogers et a1. Sept. 9, 1958 FOREIGN PATENTS 1056/26 Australia Apr. 9,1926 448,671 Italy May 23, 1949 35,780 Sweden Nov. 12, 1913