US3921728A - Weldment for bulldozer blades - Google Patents
Weldment for bulldozer blades Download PDFInfo
- Publication number
- US3921728A US3921728A US469337A US46933774A US3921728A US 3921728 A US3921728 A US 3921728A US 469337 A US469337 A US 469337A US 46933774 A US46933774 A US 46933774A US 3921728 A US3921728 A US 3921728A
- Authority
- US
- United States
- Prior art keywords
- groove
- weldment
- dam
- members
- push plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/815—Blades; Levelling or scarifying tools
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/47—Molded joint
- Y10T403/477—Fusion bond, e.g., weld, etc.
Definitions
- a bulldozer blade comprises a push plate having a cutting edge mounted on a lower end thereof and a plurality of structural members secured on the back of the push plate and welded together to increase the structural integrity thereof.
- Each adjacent pair of such members are joined together at a weldment comprising a groove and contiguous dam formed on a surface of one member to have a corner of the other member disposed adjacent thereto and common weld means at least substantially filling the groove and securing the members together.
- the groove and dam are preformed on an arcuate portion of the first member during a cold forming operation.
- An object of this invention is to overcome'the above, briefly described problem by providing a structurally sound and economical weldment, particularly adapted for use in work implements such as bulldozer blades, and a method and apparatus for making the same.
- the weldment comprises a first member having a groove and contiguous dam formed on a surface thereof, a second member having a corner thereof disposed closely adjacent to the groove and dam and common weld means at least substantially filling the groove and securing the members together.
- the groove and dam are preformed on the first member by a forming roll of an apparatus which further comprises a plurality of support rollers mounted on either side of the member.
- FIG. 1 is a cross sectional view, in elevation, of a bulldozer blade having four weldments of this invention structurally integrated therein;
- FIG. 2 is an enlarged fragmentary view of one of the weldments
- FIG. 3 is a sectional view of an apparatus used to preform a groove and contiguous dam in a structural member employed in such weldment;
- FIG. 4 is a cross sectional view similar to FIG. 2, illustrating a prior art weldment.
- FIG. 1 discloses a bulldozer blade comprising a push plate 11 having an elongated cutting edge 12 mounted on a lower end thereof and a pair of mold board plates 13 (one shown) secured on opposite, lateral ends thereof.
- the push plate is structurally reinforced by securing a plurality of metallic members on a back side thereof, including a pair of channel members 14 and 15, a pair of arcuate plate members 16 and 17 and a flat plate member 18.
- the blade may be further reinforced by plate members 19 and 20 and a plurality of gusset members 21 (one shown).
- each weldment comprises a common weld means 23 securing each pair of adjacent first and second members, such as members 16 and .18, together.
- First member 16 has a groove 24' of predetermined depth (1 formed on a surface thereofto terminate at one side 7 thereof at a contiguous, raised dam 25 of predetermined height 12, above such surface.
- Second member 18 has a corner 26 thereof preferably disposed within the groove and closely adjacent to the dam.
- the dam will function to back-up the hot weld metal to prevent blow through" thereof during an arc welding operation.
- Weld 23 at least substantially fills groove 24 and secures corner 26 and a contiguous bottom flat surface 27 of member 18 to the outer surface of member 16.
- dimensions d and h are at least approximately equal.
- dimension d is preferably selected from the range of from O. 1W to 025W, with W constituting the wall thickness of member 16.
- member 18 can be positioned within manufacturing tolerance ranges t and T without affecting the integrity of weld 23.
- FIG. 3 illustrates an apparatus and method for preforming groove 24 and dam 25 on the outer arcuate surface of member 16, for example.
- Such apparatus comprises first and second support and guide assemblies 28 anmd 29, respectively disposed on either side of member 16.
- First assembly 28 comprises a pair of first and second support rollers 30, disposed for rotation on axes perpendicular to each other.
- Second assembly 29 comprises a like pair of third and fourth guide rollers 31 and 32 disposed for rotation on axes perpendicular to each other. Each of the latter rollers at least partially overlies a respective roller 30. Assembly 29 further comprises a rotary forming roll or die 33, rotatably mounted thereon about an axis parallel to the rotational axis of roller 31.
- Rotary forming roll 33 is preferably driven by motor means, not shown, and has an annular cutting edge 34 formed on the periphery thereof. During the preforming operation, cutting edge 34 forms elongated groove 24 and displaces material therefrom upwardly to form darn 25. It should be understood that different sized rollers could be substituted in lieu of roller 33 to vary the size and shape of groove 24 and dam 25.
- FIG. 4 illustrates a prior art weldment comprising a first member 16' secured to a second member 18' by an elongated weld 23'.
- member 18 has been positioned on the outer arcuate surface of member 16' so that at least a portion of its corner 26' is disposed in line contact therewith.
- Such disposition represents an ideal disposition for manufacturing purposes wherein a zero root gap RG is provided.
- a weldment for a bulldozer blade comprising a first member
- common weld means at least substantially filling.
- said groove and securing said first and second members together'and y r a bulldozer blade including a push plate having-adjacent pairs of said first and second members secured on a back side of said push plate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A bulldozer blade comprises a push plate having a cutting edge mounted on a lower end thereof and a plurality of structural members secured on the back of the push plate and welded together to increase the structural integrity thereof. Each adjacent pair of such members are joined together at a weldment comprising a groove and contiguous dam formed on a surface of one member to have a corner of the other member disposed adjacent thereto and common weld means at least substantially filling the groove and securing the members together. The groove and dam are preformed on an arcuate portion of the first member during a cold forming operation.
Description
United States Patent [1 1 Casey [4 Nov. 25, 1975 I WELDMENT FOR BULLDOZER BLADES [75] Inventor: Thomas P. Casey, Burlington, Iowa [73] Assignee: Caterpillar Tractor Co., Peoria, Ill.
Primary ExaminerStephen C. Pellegrino Attorney, Agent, or Firm-Phillips, Moore, Weissenberger Lempio & Strabala [57] ABSTRACT A bulldozer blade comprises a push plate having a cutting edge mounted on a lower end thereof and a plurality of structural members secured on the back of the push plate and welded together to increase the structural integrity thereof. Each adjacent pair of such members are joined together at a weldment comprising a groove and contiguous dam formed on a surface of one member to have a corner of the other member disposed adjacent thereto and common weld means at least substantially filling the groove and securing the members together. The groove and dam are preformed on an arcuate portion of the first member during a cold forming operation.
8 Claims, 4 Drawing Figures US. Patent Nov. 25, 1975 SheetlofZ 3,921,728
US. Patent Nov. 25, 1975 Sheet20f2 3,921,728
fjl
WELDMENT FOR BULLDOZER BLADES BACKGROUND OF THE INVENTION in the abutting edges of the secured members, which creates a crack thereat to induce premature failure of the integrated structure.
SUMMARY OF THIS INVENTION An object of this invention is to overcome'the above, briefly described problem by providing a structurally sound and economical weldment, particularly adapted for use in work implements such as bulldozer blades, and a method and apparatus for making the same. The weldment comprises a first member having a groove and contiguous dam formed on a surface thereof, a second member having a corner thereof disposed closely adjacent to the groove and dam and common weld means at least substantially filling the groove and securing the members together. The groove and dam are preformed on the first member by a forming roll of an apparatus which further comprises a plurality of support rollers mounted on either side of the member.
BRIEF DESCRIPTION OF THE DRAWINGS Other objects of this invention will become apparent from the following description and accompanying drawings wherein:
FIG. 1 is a cross sectional view, in elevation, of a bulldozer blade having four weldments of this invention structurally integrated therein;
FIG. 2 is an enlarged fragmentary view of one of the weldments;
FIG. 3 is a sectional view of an apparatus used to preform a groove and contiguous dam in a structural member employed in such weldment; and
FIG. 4 is a cross sectional view similar to FIG. 2, illustrating a prior art weldment.
DETAILED DESCRIPTION FIG. 1 discloses a bulldozer blade comprising a push plate 11 having an elongated cutting edge 12 mounted on a lower end thereof and a pair of mold board plates 13 (one shown) secured on opposite, lateral ends thereof. The push plate is structurally reinforced by securing a plurality of metallic members on a back side thereof, including a pair of channel members 14 and 15, a pair of arcuate plate members 16 and 17 and a flat plate member 18. The blade may be further reinforced by plate members 19 and 20 and a plurality of gusset members 21 (one shown).
Members 14-18 are secured together by four substantially identical weldments 22 to facilitate the disposition of the flat back sides of the members substantially coplanar, as shown in FIG. 1. Referring to FIG. 2, each weldment comprises a common weld means 23 securing each pair of adjacent first and second members, such as members 16 and .18, together. First member 16 has a groove 24' of predetermined depth (1 formed on a surface thereofto terminate at one side 7 thereof at a contiguous, raised dam 25 of predetermined height 12, above such surface.
In the preferred embodiment of this invention, dimensions d and h are at least approximately equal. In addition, dimension d is preferably selected from the range of from O. 1W to 025W, with W constituting the wall thickness of member 16. As further shown in FIG. 2, member 18 can be positioned within manufacturing tolerance ranges t and T without affecting the integrity of weld 23.
FIG. 3 illustrates an apparatus and method for preforming groove 24 and dam 25 on the outer arcuate surface of member 16, for example. Such apparatus comprises first and second support and guide assemblies 28 anmd 29, respectively disposed on either side of member 16. First assembly 28 comprises a pair of first and second support rollers 30, disposed for rotation on axes perpendicular to each other.
Rotary forming roll 33 is preferably driven by motor means, not shown, and has an annular cutting edge 34 formed on the periphery thereof. During the preforming operation, cutting edge 34 forms elongated groove 24 and displaces material therefrom upwardly to form darn 25. It should be understood that different sized rollers could be substituted in lieu of roller 33 to vary the size and shape of groove 24 and dam 25.
FIG. 4 illustrates a prior art weldment comprising a first member 16' secured to a second member 18' by an elongated weld 23'. As shown, member 18 has been positioned on the outer arcuate surface of member 16' so that at least a portion of its corner 26' is disposed in line contact therewith. Such disposition represents an ideal disposition for manufacturing purposes wherein a zero root gap RG is provided.
However, even such an ideal match-up would require unduly close manufacturing control during the arc welding operation to prevent blow through at gap RG. Furthermore, in actual practice the dimensions of prefabricated members 16 and 18' will normally vary to in turn vary the match-up therebetween within the illustrated manufacturing tolerances t and T. Thus, a pronounced root gap RG will exist at various locations between edge 26 and member 16' to permit blow through of the weld. Such blow through will normally occur even through root gap RG merely constitutes 1/64 of an inch, for example.
Unless such root gaps are filled or additional structural members are secured between members 16' and 18, prior to placement of the bulldozer blade in the field, structural failures will occur. Field repair of the bulldozer blade, such as by weldinga strap or plate across the cracked area, is time consuming and expensive and does not always result in a structurally sound blade construction. a
I claim:
1. A weldment for a bulldozer blade comprising a first member,
a groove of predetermined de th formed on a surface of said first member and terminating at one side thereof at a contiguous, raised dam of predetermined height above said surface, I I
a second member having a corner thereof disposed at,
said groove and closely adjacent to said dam,
common weld means at least substantially filling. said groove and securing said first and second members together'and y r a bulldozer blade including a push plate having-adjacent pairs of said first and second members secured on a back side of said push plate. 1
2. The weldment of claim 1 wherein said dam is formed solely bymaterial displaced from said groove.
3. The weldment of claim 1 wherein said corner is disposed within said groove.
4. The weldment of claim 1 wherein the surface of said first member. whereon said groove and dam are formed is arcuate.
5. The weldment of claim portions of said first and second members are at least generally coplanar. with respect; to each other.
6. The weldment ofclaim 1 wherein the depth of said groove and the height of said dam are, at least approxi- 1 wherein outer surface
Claims (8)
1. A weldment for a bulldozer blade comprising a first member, a groove of predetermined depth formed on a surface of said first member and terminating at one side thereof at a contiguous, raised dam of predetermined height above said surface, a second member having a corner thereof disposed at said groove and closely adjacent to said dam, common weld means at least substantially filling said groove and securing said first and second members together and a bulldozer blade including a push plate having adjacent pairs of said first and second members secured on a back side of said push plate.
2. The weldment of claim 1 wherein said dam is formed solely by material displaced from said groove.
3. The weldment of claim 1 wherein said corner is disposed within said groove.
4. The weldment of claim 1 wherein the surface of said first member, whereon said groove and dam are formed, is arcuate.
5. The weldment of claim 1 wherein outer surface portions of said first and second members are at least generally coplanar with respect to each other.
6. The weldment of claim 1 wherein the depth of said groove and the height of said dam are at least approximately equal.
7. The weldment of claim 1 wherein the depth of said groove and the height of said dam are from 0.1 to 0.25 of the wall thickness of said first member whereat said groove and dam are formed.
8. The weldment of claim 1 wherein exposed outer surfaces of said first and second members are at least substantially disposed in coplanar relationship relative to each other.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US469337A US3921728A (en) | 1974-05-13 | 1974-05-13 | Weldment for bulldozer blades |
US05/554,267 US3951559A (en) | 1974-05-13 | 1975-02-28 | Weldment for bulldozer blades |
US05/554,246 US3987953A (en) | 1974-05-13 | 1975-02-28 | Weldment for bulldozer blades and method and apparatus therefor |
US05/554,247 US3964287A (en) | 1974-05-13 | 1975-02-28 | Apparatus for forming a groove and back-up dam for welds |
BR2360/75A BR7501848A (en) | 1974-05-13 | 1975-03-26 | PROCESS FOR MAKING A WELDING AND APPLIANCE TO FORM A STRETCHED BUCKLE |
CA225,755A CA1028534A (en) | 1974-05-13 | 1975-04-29 | Weldment for bulldozer blades and method and apparatus therefor |
GB19703/75A GB1505850A (en) | 1974-05-13 | 1975-05-09 | Preparing a metal sheet member for joining to a second metal member |
JP50054798A JPS50155443A (en) | 1974-05-13 | 1975-05-12 | |
ZA00753068A ZA753068B (en) | 1974-05-13 | 1975-05-13 | Weldment for bulldozer blades and method and apparatus therefor |
IN1089/CAL/75A IN143907B (en) | 1974-05-13 | 1975-05-30 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US469337A US3921728A (en) | 1974-05-13 | 1974-05-13 | Weldment for bulldozer blades |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/554,247 Division US3964287A (en) | 1974-05-13 | 1975-02-28 | Apparatus for forming a groove and back-up dam for welds |
US05/554,267 Division US3951559A (en) | 1974-05-13 | 1975-02-28 | Weldment for bulldozer blades |
US05/554,246 Division US3987953A (en) | 1974-05-13 | 1975-02-28 | Weldment for bulldozer blades and method and apparatus therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
US3921728A true US3921728A (en) | 1975-11-25 |
Family
ID=23863388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US469337A Expired - Lifetime US3921728A (en) | 1974-05-13 | 1974-05-13 | Weldment for bulldozer blades |
Country Status (7)
Country | Link |
---|---|
US (1) | US3921728A (en) |
JP (1) | JPS50155443A (en) |
BR (1) | BR7501848A (en) |
CA (1) | CA1028534A (en) |
GB (1) | GB1505850A (en) |
IN (1) | IN143907B (en) |
ZA (1) | ZA753068B (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3986784A (en) * | 1975-04-09 | 1976-10-19 | Caterpillar Tractor Co. | Weldment |
US4074767A (en) * | 1976-06-14 | 1978-02-21 | Caterpillar Tractor Co. | Motor grader support structure and side shift mechanism |
US5645364A (en) * | 1993-06-25 | 1997-07-08 | Fuji Jukogyo Kabushiki Kaisha | Structure for joining plate elements |
US20070256334A1 (en) * | 2001-11-12 | 2007-11-08 | Charles Schmeichel | Snow plow having internally reinforced mold board |
US7627965B2 (en) | 2001-11-12 | 2009-12-08 | Agri-Cover, Inc. | Plow blade having integrally formed attachment channel |
US7669353B2 (en) | 2001-11-12 | 2010-03-02 | Agri-Cover, Inc. | Snow plow having hitch tongue connecting member |
US7676963B2 (en) | 2001-11-12 | 2010-03-16 | Agri-Cover, Inc. | Snow plow including mold board having back plate |
US7676964B2 (en) * | 2001-11-12 | 2010-03-16 | Agri-Cover, Inc. | Snow plow having wear minimizing apparatus |
US7681335B2 (en) | 2001-11-12 | 2010-03-23 | Agri-Cover, Inc. | Snow plow having attachable biasing member |
US7703222B2 (en) * | 2001-11-12 | 2010-04-27 | Agri-Cover, Inc. | Snow plow having hitch tongue and pivoting mechanism |
US7707753B2 (en) | 2001-11-12 | 2010-05-04 | Agri-Cover, Inc. | Multifunctional plow blade positioning apparatus and method |
US7735247B2 (en) * | 2001-11-12 | 2010-06-15 | Agri-Cover, Inc. | Snow plow for all terrain vehicle |
US7735245B2 (en) * | 2001-11-12 | 2010-06-15 | Agri-Cover, Inc. | Snow plow having catch structure |
US7743534B2 (en) * | 2001-11-12 | 2010-06-29 | Agri-Cover, Inc. | Snow plow having two-piece mold board |
US7784199B2 (en) | 2001-11-12 | 2010-08-31 | Agri-Cover, Inc. | Snow plow having pivotal mounting apparatus |
US8037625B2 (en) | 2003-03-31 | 2011-10-18 | Agri-Cover, Inc. | Snow plow having pivotal mounting apparatus |
US8875419B2 (en) | 2001-11-12 | 2014-11-04 | Agri-Cover, Inc. | Snow plow |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07233B2 (en) * | 1990-12-28 | 1995-01-11 | 川崎重工業株式会社 | Uranami bead welding method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003601A (en) * | 1957-04-04 | 1961-10-10 | Sulzer Ag | Weld connection |
US3233350A (en) * | 1963-10-24 | 1966-02-08 | Charles Machine Works | Quick detachable backfill blade for trencher |
US3458224A (en) * | 1968-01-10 | 1969-07-29 | Cessna Aircraft Co | Weld joint |
-
1974
- 1974-05-13 US US469337A patent/US3921728A/en not_active Expired - Lifetime
-
1975
- 1975-03-26 BR BR2360/75A patent/BR7501848A/en unknown
- 1975-04-29 CA CA225,755A patent/CA1028534A/en not_active Expired
- 1975-05-09 GB GB19703/75A patent/GB1505850A/en not_active Expired
- 1975-05-12 JP JP50054798A patent/JPS50155443A/ja active Pending
- 1975-05-13 ZA ZA00753068A patent/ZA753068B/en unknown
- 1975-05-30 IN IN1089/CAL/75A patent/IN143907B/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003601A (en) * | 1957-04-04 | 1961-10-10 | Sulzer Ag | Weld connection |
US3233350A (en) * | 1963-10-24 | 1966-02-08 | Charles Machine Works | Quick detachable backfill blade for trencher |
US3458224A (en) * | 1968-01-10 | 1969-07-29 | Cessna Aircraft Co | Weld joint |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3986784A (en) * | 1975-04-09 | 1976-10-19 | Caterpillar Tractor Co. | Weldment |
US4074767A (en) * | 1976-06-14 | 1978-02-21 | Caterpillar Tractor Co. | Motor grader support structure and side shift mechanism |
US5645364A (en) * | 1993-06-25 | 1997-07-08 | Fuji Jukogyo Kabushiki Kaisha | Structure for joining plate elements |
US7703222B2 (en) * | 2001-11-12 | 2010-04-27 | Agri-Cover, Inc. | Snow plow having hitch tongue and pivoting mechanism |
US7735247B2 (en) * | 2001-11-12 | 2010-06-15 | Agri-Cover, Inc. | Snow plow for all terrain vehicle |
US7669353B2 (en) | 2001-11-12 | 2010-03-02 | Agri-Cover, Inc. | Snow plow having hitch tongue connecting member |
US7676962B2 (en) * | 2001-11-12 | 2010-03-16 | Agri-Cover, Inc. | Snow plow having reinforced mold board |
US7676963B2 (en) | 2001-11-12 | 2010-03-16 | Agri-Cover, Inc. | Snow plow including mold board having back plate |
US7676964B2 (en) * | 2001-11-12 | 2010-03-16 | Agri-Cover, Inc. | Snow plow having wear minimizing apparatus |
US7681335B2 (en) | 2001-11-12 | 2010-03-23 | Agri-Cover, Inc. | Snow plow having attachable biasing member |
US20070256334A1 (en) * | 2001-11-12 | 2007-11-08 | Charles Schmeichel | Snow plow having internally reinforced mold board |
US7707753B2 (en) | 2001-11-12 | 2010-05-04 | Agri-Cover, Inc. | Multifunctional plow blade positioning apparatus and method |
US7627965B2 (en) | 2001-11-12 | 2009-12-08 | Agri-Cover, Inc. | Plow blade having integrally formed attachment channel |
US7735245B2 (en) * | 2001-11-12 | 2010-06-15 | Agri-Cover, Inc. | Snow plow having catch structure |
US7743534B2 (en) * | 2001-11-12 | 2010-06-29 | Agri-Cover, Inc. | Snow plow having two-piece mold board |
US7784199B2 (en) | 2001-11-12 | 2010-08-31 | Agri-Cover, Inc. | Snow plow having pivotal mounting apparatus |
US20100229432A1 (en) * | 2001-11-12 | 2010-09-16 | Agri-Cover, Inc. | Snow plow having limiting member |
US8875419B2 (en) | 2001-11-12 | 2014-11-04 | Agri-Cover, Inc. | Snow plow |
US8069590B2 (en) * | 2001-11-12 | 2011-12-06 | Agri-Cover, Inc. | Snow plow having limiting member |
US8037625B2 (en) | 2003-03-31 | 2011-10-18 | Agri-Cover, Inc. | Snow plow having pivotal mounting apparatus |
Also Published As
Publication number | Publication date |
---|---|
BR7501848A (en) | 1976-03-23 |
ZA753068B (en) | 1976-04-28 |
CA1028534A (en) | 1978-03-28 |
JPS50155443A (en) | 1975-12-15 |
IN143907B (en) | 1978-02-25 |
GB1505850A (en) | 1978-03-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905 Effective date: 19860515 Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905 Effective date: 19860515 |