US3677565A

US3677565A - Swinging drawbar

Info

Publication number: US3677565A
Application number: US83690A
Authority: US
Inventors: Michael L Slosiarek
Original assignee: Allis Chalmers Corp
Current assignee: Deutz Allis Corp
Priority date: 1970-10-26
Filing date: 1970-10-26
Publication date: 1972-07-18
Anticipated expiration: 1989-07-18
Also published as: CA950742A

Abstract

A swinging drawbar and drawbar carriage supported on a bail assembly forming lateral abutments engaging the drawbar and carriage to overcome twisting and distorting moments on the drawbar when lateral movement of the drawbar is arrested at its extreme lateral positions.

Description

United States Patent Slosiarek [451 July 18, 1972 541 SWINGING DRAWBAR Michael L. Slosiarek, Milwaukee, Wis.

[ 7 2] Inventor:

[73] Assignee: Allis-Chalmers Manufacturing Company,

Milwaukee, Wis.

[22] Filed: Oct. 26, 1970 [2]] Appl. No.: 83,690

[52] US. Cl ..'.280/499, 280/467, 280/474 [51] Int. Cl ..B60d 1/14 [5 8] Field of Search ..280/499, 497, 462, 467, 474

[5 6] References Cited UNITED STATES PATENTS 2,462,726 2/1949 Currie ..280/499 1,438,831 12/1922 Jones ..280/499 2,232,407 2/1941 Riesterer 280/499 1,435,373 11/1922 Blain ..280/462 2,947,551 8/1960 Reimers ..280/499 3,487,448 12/1969 Stemmerman et al. ......280/499 X 3,498,637 3/1970 Lemmon ..280/499 X Pn'mary ExaminerLeo F riaglia Attorney-Arthur L. Nelson, Kenneth C. McKivett and Robert B. Benson [57] ABSTRACT A swinging drawbar and drawbar carriage supported on a bail assembly forming lateral abutments engaging the drawbar and carriage to overcome twisting and distorting moments on the drawbar when lateral movement of the drawbar is arrested at its extreme lateral positions.

10 Claims, 4 Drawing Figures Patented July 18, 1972 2 Sheets-Sheet l Patented July 18, 1972 2 Shets-Sheet 2 SWINGING DRAWBAR This invention relates to a swinging drawbar and more par tieularly to a bail support and carriage for the drawbar to carry the drawbar as it swings about a forward pivot point and abutments for arresting the swinging movement of the drawbar in its extreme lateral position.

The drawbar is provided on tractors for a draft connection to certain types of implements. The drawbar generally is connected through a pivotal connection on its forward end with the chassis of the vehicle. As the drawbar swings laterally about the forward pivot it is supported on a bail assembly and is usually provided with a means whereby the drawbar can be locked in any of a plurality of positions which position the rear end of the drawbar in any of a number of laterally spaced positions on the tractor.

The are which the drawbar is permitted to freely swing is limited. As the drawbar comes to its extreme lateral position it is desirable that no twisting or warping moment be applied to the drawbar since this may produce a permanent set and prevent the drawbar from operating satisfactorily.

Accordingly this invention provides a means whereby a drawbar is supported on a carriage mounted on a bail assembly to permit it to freely swing within a predetermined are about a pivotal connection on the front end of the drawbar. A plurality of perforations are formed in a crossbar of the bail assembly for selectively locking the drawbar carriage in a plurality of positions on the cross bar. Likewise the carriage includes a roller rolling on an arcuate surface defining a predetermined degree of arc and abutments are provided on the bail assembly defining the extreme lateral positions for the drawbar whereby the roller and the drawbar engage the abutting surfaces without creating any twisting or distorting of the drawbar. Accordingly, the drawbar and the carriage for the drawbar are not overstressed to a point which would cause failure and unsatisfactory operation.

It is an object of this invention to provide a swinging drawbar and a bail assembly for supporting the drawbar through its lateral swinging movement.

It is another object of this invention to provide a swinging drawbar having a drawbar carriage rolling on an arcuate surface of the bail assembly.

It is a further object of this invention to provide a swinging drawbar pivotally connected to the chassis of the vehicle and mounted on a drawbar carriage rolling on an arcuate surface of a crossbar in a bail assembly defining vertical abutment surfaces to provide a swinging movement of the drawbar and to limit its lateral swinging movement without creating a twisting or distorting moment on the drawbar.

The objects of this invention are accomplished by providing a drawbar which is pivotally connected on the forward end to move through a lateral swinging arc. The bail assembly is also connected to the vehicle chassis and defines an arcuate locking means for locking the drawbar in a plurality of angularly spaced positions relative to the pivot point of the drawbar. The bail assembly defines a horizontal arcuate surface which carries a roller on the drawbar carriage. The drawbar carriage swings through an arc and has means for locking it in arcuate positions. The bail assembly also defines lateral abutment surfaces which engage the roller of the drawbar carriage and the drawbar which lie in the vertical plane and accordingly do not create any twisting or distorting moment as the drawbar is arrested in its lateral movement in the bail assembly.

The preferred embodiment of the invention is shown by the attached drawings.

FIG. I is a side elevation view with a portion of the bail assembly broken away to show the drawbar carriage and the crossbar.

FIG. 2 is a section view taken on line II-Il of FIG. 1 of the bail assembly with the drawbar and drawbar carriage mounted thereon.

FIG. 3 is a plan view partially in section of the bail assembly with the drawbar and drawbar carriage.

FIG. 4 is a fragmentary view taken as shown by line lV--IV of FIG. 3 showing the drawbar and drawbar carriage mounted on a bail assembly.

Referring to the drawings, the rear housing 1 supports the bail assembly 2 which includes hanger brackets 3 and 4 which are welded to the arcuate crossbar 5. The hanger brackets 3 and 4 extend along the surfaces 6 and 7' and are fastened to the housing 1 by means of fastening means such as bolts 8. The support bar 5 defines a horizontal arcuate surface 9 upon which the roller 10 of the carriage 11 rolls. The drawbar 12 is pivotally connected on a pivotable axis 13 defined by anchor pin 50 in the perforations 14 in the anchor bracket 15. The pivotal axis 13 of drawbar 12 confines the circular movement of the drawbar concentrically with the arcuate surface 9 on the crossbar of the bail assembly 2.

The drawbar carrier 11 is formed with rectangular opening 16 which receives the drawbar 12. The drawbar carrier 11 includes upwardly extending flanges 17 and 18 defining cylindri' cal openings 19 and 20. The flanges 17 and 18 are axially spaced to receive a roller 10 which is; rotatably mounted on the pin 21. The pin 21 is fitted in the openings 19 and 20 and is also received in a cylindrical opening 22 in the roller 10. The pin 21 is formed with an annular recess: 23 which is in communication with a cross passage 24 and an axial passage 25. The end of the axial passage 25 is threaded to threadedly receive the fitting 26 for lubricating the roller 10 on the pin 21. The opening 22 is slightly oversized with relation to the pin diameter to accomodate the rolling movement of the roller on the arcuate surface 9.

A crossbar 5 is formed with plurality of perforations 27 angularly spaced relative to the pivotal axis 13 of the drawbar 12. A locking pin 28 is received in the opening 29 and 30 of the drawbar carriage which also extends through one of the plurality of perforations 27 in the crossbar 5. A quick detachable link 31 retains the locked pin 28 in position to lock the drawbar carriage on the crossbar 5. It is understood that for some operations it is desirable to lock the drawbar in a stationary position defined by the plurality of perforations 27 while for other operations it may be desirable to allow the drawbar to swing through an arcuate movement about its pivoting axis whereby the drawbar carriage 11 carries the drawbar 12 through this arcuate swinging motion when the vehicle is in operation.

The right hand hanger bracket 4 as shown in FIG. 1 forms a depending portion 32 which is narrower than the upper portion which is fastened to the housing. The depending narrower portion aligns itself between the flanges 17 and 18 of the carrier 11 when the drawbar is swung to either extreme position as shown in FIG. 3. The depending portion of each of the hangers 3 and 4 engage the drawbar 12. An abutment surface 33 formed by the depending portion 51 is parallel with the draw bar 12 when the drawbar is swung to the extreme left position as shown in FIG. 3. It is noted that the drawbar extends through the carrier 11 and extends through

recess

52 and 53 on either side of the carrier intermediate the flanges 17 and 18. The lateral surface 54 of the drawbar 12 engages a surface 33 of the hanger bracket 3. The surface 33 extends upwardly to engage roller 10 when the drawbar is swung in extreme left hand position.

The roller 10 is carried on a pin 21 which is held in position by a cross pin 34 in the opening 35 on the rearward end of the pin 21 and a snap ring 36 on the opposite end received in an annular groove 55 of pin 21. Accordingly, as the drawbar swings to an extreme position where it engages the

angled abutment surface

33 or 56 of either hanger bracket 3 or 4 there is no twisting or warping effect created on the drawbar because the drawbar l2 and roller [[0 engage the surface simultaneously.

The description relates primarily to the bail assembly for supporting the swinging drawbar in the manner in which the swinging drawbar is carried as it swings through an are about its pivotal forward connection on the chassis. The related parts which are used in combination. with the components described are not enlarged upon in this description, however,

reference may be had to a copending application of the same assignee of Slosiarek and Gatch Ser. No. 84,083, filed Oct. 26, 1970 which further describes components which are generally used in combination with the drawbar hitch where the vehicle used employs a 3-point hitch.

The operation of this device will be described as follows. The drawbar 12 is pivotally connected to the chassis on an axis 13 and pivots substantially in an horizontal plane. The drawbar 12 is carried in the drawbar carrier 11. The drawbar carrier 11 includes a roller 10 which is supported on the crossbar 5 and rolls on the planer arcuate surface 9 as the drawbar swings in an arcuate manner. The crossbar 5 is an integral part of the bail assembly 2 and forms an abutment 40 forming a surface 33 on the lefthand side and an abutment 41 forming a surface 56 on the righthand side which engages a roller 10 and a crossbar 12 simultaneously as the drawbar swings to its maximum limits of movement laterally. The drawbar carries a substantial draft load and as the vehicle is turned the drawbar swings. Due to the weights of the implement and the vehicle, the draft load produces a substantial force between the roller 10 and the drawbar l2 and the abutment. The reaction force can be sufficient to damage the drawbar and provide a permanent set which will be detremental to its later operation if this type of abutment is not used for stopping the movement of the drawbar in its extreme limits.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A swinging drawbar for use on a vehicle comprising a vehicle chassis, a drawbar, means defining a pivotal connection pivotally connecting said drawbar to said chassis, a bail assembly rigidly connected to said chassis and including a crossbar defining a continuous load carrying surface, integral abutment means at the ends of said crossbar of said bail assembly defining abutment surfaces, a drawbar carriage defining a roller for rolling on said carrying surface of said bail assembly, a single pin hole means in said carriage parallel with said drawbar, a plurality of pin hole means in said crossbar for selective alignment with said pin hole means in said carriage, a pin for reception in said hole means of said carriage and a hole means of said crossbar for selectively positioning said drawbar, means supporting said drawbar in said carriage in a position an equal distance from each of said abutment surfaces as said roller, said roller and said drawbar thereby engaging said lateral abutment surface simultaneously when said drawbar is swung to its extreme lateral position.

2. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said crossbar defines an arcuate segment with horizontal holes angularly spaced on the arcuate segment for receiving said pin connected to said drawbar carriage to thereby selectively lock said drawbar in one of a plurality of positions.

3. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said crossbar of said bail assembly defines an arcuate segment having an arc concentric with a pivotal axis of said drawbar connection with said chassis, said carrying surface of said crossbar defines a horizontal arcuate surface for carrying the roller of said drawbar carriage.

4. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said lateral abutment surfaces define surfaces parallel with the side of said drawbar when said drawbar is swung to an extreme lateral position to thereby limit the lateral swinging of said drawbar.

S. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said bail assembly comprises an integral structure including hanger brackets adapted for connection to said vehicle chassis, a cross bar integral with said hanger brackets to thereby define said carrying surface for said drawbar.

6. A swinging drawbar for use on a vehicle as set forth in claim 3 wherein the drawbar carriage includes means for supporting said drawbar, a pair of flanges extending upwardly for receiving a roller pin, a said roller pin received in said flanges extendin through said roller of said drawbar carriage said roller de inmg an overslzed opening to permit said roller to follow the arcuate surface of said carrying surfaces on said crossbar.

7. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said drawbar carriage defines means for supporting said drawbar, two flanges extending upwardly from said means supporting the drawbar, a roller pin extending through said flanges and said roller, an annular groove on the intermediate portion of said roller pin, means defining passage means for receiving a fitting and for transmitting lubricant from said fitting to said annular groove to thereby provide lubricating means for said roller on said drawbar carriage.

8. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said drawbar carriage defines an opening extending longitudinally through said drawbar carriage for receiving said drawbar, means defining a recessed area on a lateral surface of said drawbar carriage to permit said drawbar to engage said abutment surfaces on said bail assembly to thereby simultaneously contact said abutment surface as said roller engages said abutment surface to prevent a twisting and distorting effect on said drawbar when it swings to its extreme lateral position.

9. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said drawbar carriage defines a longitudinal opening for receiving said drawbar, said drawbar carriage defining in said longitudinal opening defines a raised surface on the underside in the central portion of said opening for engaging said drawbar at a point centrally below the center portion of said roller to eliminate cocking of said drawbar carriage when weight is applied on the rear end of said drawbar.

10. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said drawbar carriage defines a rectangular opening having a loose fitting tolerance for receiving the drawbar, said means defining a pivotal connection between said drawbar and said chassis defining a vertical pivotal axis to thereby prevent said carriage from cocking and to cause said roller to roll along said carrying surface when the drawbar is swung through an arcuate motion.

Claims

5. A swinging drawbar for use on a vehicle as set forth in claim 1 wherein said bail assembly comprises an integral structure including hanger brackets adapted for connection to said vehicle chassis, a cross bar integral with said hanger brackets to thereby define said carrying surface for said drawbar.

6. A swinging drawbar for use on a vehicle as set forth in claim 3 wherein the drawbar carriage includes means for supporting said drawbar, a pair of flanges extending upwardly for receiving a roller pin, a said roller pin received in said flanges extending through said roller of said drawbar carriage, said roller defining an oversized opening to permit said roller to follow the arcuate surface of said carrying surfaces on said crossbar.