US3884378A - Lift arm assembly for loader vehicles - Google Patents
Lift arm assembly for loader vehicles Download PDFInfo
- Publication number
- US3884378A US3884378A US408667A US40866773A US3884378A US 3884378 A US3884378 A US 3884378A US 408667 A US408667 A US 408667A US 40866773 A US40866773 A US 40866773A US 3884378 A US3884378 A US 3884378A
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- US
- United States
- Prior art keywords
- lift arm
- plates
- arm
- lift
- pins
- 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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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
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
- E02F3/3405—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism
- E02F3/3411—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism of the Z-type
Definitions
- One end of the fluid cylinder is received between the lower portions of the plates and coupled thereto by pivot means.
- the plates are in turn joined to the lift arms by a pair of removable cross pins which are transpierced through the plates and lift arms at widely spaced points along the length of the arm to distribute stress.
- Loader vehicles and certain other forms of apparatus for manipulating bulk materials customarily have a bucket supported at one end of a pair of lift arms which are in turn pivoted to the vehicle.
- linear fluid motors being connected between the lift arms and'the vehicle to selectively elevate and lower the bucket.
- This construction requires that there be a pivot joint between one end of each fluid motor and the associated lift arm.
- a U-shaped yoke is welded to one end of the rod of the fluid motor.
- connection between the lift cylinder and lift arm has been formed by welding a bracket assembly to the lift arm.
- the bracket extends a distance below the arm to receive a pivot axle extending transversely through the bracket and through a sleeve on the end of the fluid motor rod. If of economical size, such a weld is also an area of extreme stress concentration and is subject to the same failure problem discussed above. Further, assembly and disassembly for repairs is extremely difficult where a welded bracket is employed.
- the present invention provides a high strength economical and readily assembled and disassembled coupling between a lift arm of a loader or the like and the fluid motor which operates the arm.
- a pair of plates are disposed one on either side of the lift arm and each has a lower portion extending a small distance below the arm.
- One end of the fluid motor is received between the lower portions of the plates and a pivot connection is provided therebetween.
- the plates are secured to the lift arm itself by a pair of removable cross pins which are widely spaced apart along the length of the lift arm to distribute stress forces.
- a pair of supplementary cross bolts extend between the two plates at the level of the lower edge of the lift arm to retain the plates together in the event that the primary load bearing cross pins should become loose.
- the supplementary cross bolts serve a further purpose of facilitating positioning of the lift arm during assembly.
- FIG. 1 is an elevation view of the forward portion of a loader vehicle embodying the present invention
- FIG. 2 is a side view of a portion of the apparatus of FIG. 1 further illustrating the coupling between a lift arm and fluid motor thereof.
- FIG. 3 is a plan view of the structure shown in FIG. 2.
- FIG. 1 there is shown a portion of a loader vehicle 11 of the type having a bucket 12 carried at the forward end of lift arms 13.
- the lift arms 13 which have a slight S-curvature in this particular example are coupled to the body 14 of the vehicle by a first pivot connection 16 which enables the forward end of the lift arm together with bucket 12 to be lowered whereby the bucket may receive material upon forward motion of the vehicle and which enables the lift arms and bucket to be elevated for the purpose of carrying the material to another area where the material may be dumped.
- the bucket 12 is coupled to the forward end of the lift arms by another pivot connection 17.
- Tilt linkage 18, including an extensible and contractible fluid operated tilt cylinder 19, is provided to enable selective pivoting of the bucket relative to the lift arms.
- Suitable detailed construction for the loader vehicle 11, bucket 12 and tilt linkage 18 are known to the art and accordingly will not be further described.
- lift cylinders 21 which may be extensible and contractible hydraulic fluid motors, each have a head end coupled to the body 14 of a vehicle at a pivot connection 22 and extend upwardly and forwardly therefrom towards the underside of a central portion of an associated one of the lift arms 13.
- the coupling 23 between each lift arm I3 and lift cylinder 21 is formed in part by a pair of plates 24 of substantially triangular configuration disposed one on each side of a central portion of the associated lift arm 13. Each such plate 24 has one corner 26 extending below the level of the adjacent portion of the lift arm 13.
- Plates 24 are arranged so that a broad edge 31 thereof extends along a sizeable portion of the length of the central section of lift arm 13 to enable a pair of widely spaced apart cross pins 32 to be transpierced through the plate and the lift arm to secure the plates and the lift arm together. This divides the stress at the point of attachment to the lift arm between spaced apart points thereon thereby reducing the risk of failure under heavy loading.
- Cross pins 32 are preferably of the form described in copending Application Ser. No. 318,516 of Robert F. Shankwitz et al., now US. Pat. No. 3,841,771 filed Dec. 26, 1972, and entitled Tapered Hinge Pin Assembly and Removal Means.
- Pin assemblies of this kind are provided with bolts 33 in each end which may be tightened to axially compress the assembly and thereby cause radial expansion of the end portions of the assembly which wedges the pin 3 tightly into the adjacent structure. the pin assemblies being disengageable by reverse turning of the bolts.
- a pair of spaced apart supplementary cross pins formed by bolts 34 extend between the plates 24 immediately below the undersurface of the arm 13.
- Bolts 34 serve to hold the plates 24 in operative position in the event that the primary loan bearingmembers.
- the cross pins 32 should become loosened in operation-Bolts 34 when positioned as described above also facilitate assembly and disassembly of the coupling 23 by serving as a means for positioning the lift arm 13 relative to the plates 24 during installation or removal of the cross pins 32.
- Lift arm mechanism for a loader vehicle which has an elevatable bucket for receiving and lifting material comprising:
- a lift arm having first and second ends and having an intermediate section between said ends
- first pivot means for coupling said first end of said lift arm to said vehicle and providing for raising and lowering of said second end thereof
- a linear fluid motor having one end pivotally connected'to said vehicle and having an opposite end extending between said lower portions of said plates
- cross pins are of the form having bolt means for axially compressing said pins to thereby cause radial expansion of said pins to wedge said pins in said plates.
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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)
- Shovels (AREA)
Abstract
The lift arms of a loader are pivoted to the vehicle at one end and carry a material receiving bucket at the other end, extensible fluid pressure actuated cylinders being connected between the vehicle and lift arms to raise and lower the bucket. To reduce breakage and to facilitate assembly and disassembly without requiring a costly construction, the connection between each fluid cylinder and associated lift arm is formed by a pair of plates disposed one on each side of the lift arm with each plate having a portion extending below the arm. One end of the fluid cylinder is received between the lower portions of the plates and coupled thereto by pivot means. The plates are in turn joined to the lift arms by a pair of removable cross pins which are transpierced through the plates and lift arms at widely spaced points along the length of the arm to distribute stress.
Description
United States Patent 1191 Muellner et al.
1451 May 20, 1975 1 LIFT ARM ASSEMBLY FOR LOADER VEHICLES [73] Assignee: Caterpillar Tractor Co., Peoria, 111.
[22] Filed: Oct. 23, 1973 [21] Appl. No.: 408,667
FOREIGN PATENTS OR APPLICATIONS United Kingdom 403/257 Primary Examiner-Allen N. Knowles Assistant ExaminerDavid A. Scherbel Attorney, Agent, or Firm-Phillips, Moore, Weissenberger Lempio & Strabala [57 ABSTRACT The lift arms of a loader are pivoted to the vehicle at one end and carry a material receiving bucket at the other end, extensible fluid pressure actuated cylinders being connected between the vehicle and lift arms to raise and lower the bucket. To reduce breakage and to facilitate assembly and disass embly without requiring a costly construction, the connection between each fluid cylinder and associated lift arm is formed by a pair of plates disposed one on each side of the lift arm with each plate having a portion extending below the arm. One end of the fluid cylinder is received between the lower portions of the plates and coupled thereto by pivot means. The plates are in turn joined to the lift arms by a pair of removable cross pins which are transpierced through the plates and lift arms at widely spaced points along the length of the arm to distribute stress.
3 Claims, 3 Drawing Figures LIFT ARM ASSEMBLY FOR LOADER VEHICLES BACKGROUND OFTHE INVENTION Loader vehicles and certain other forms of apparatus for manipulating bulk materials customarily have a bucket supported at one end of a pair of lift arms which are in turn pivoted to the vehicle. linear fluid motors being connected between the lift arms and'the vehicle to selectively elevate and lower the bucket. This construction requires that there be a pivot joint between one end of each fluid motor and the associated lift arm. In one common form of joint, a U-shaped yoke is welded to one end of the rod of the fluid motor. A lower portion of the lift arm is then received in the yoke and a pivot pin is transpiericed through both the yoke and the lift arm to complete the coupling. This arrangement produces concentrated stresses in a small area of the yoke and lift arm and breakage at this region may readily occur. To avoid this, particularly in very large high capacityloaders, it is necessary to use yoke and pivot assemblies of undesirably massive construction.
In other instances, the connection between the lift cylinder and lift arm has been formed by welding a bracket assembly to the lift arm. The bracket extends a distance below the arm to receive a pivot axle extending transversely through the bracket and through a sleeve on the end of the fluid motor rod. If of economical size, such a weld is also an area of extreme stress concentration and is subject to the same failure problem discussed above. Further, assembly and disassembly for repairs is extremely difficult where a welded bracket is employed.
SUMMARY OF THE INVENTION The present invention provides a high strength economical and readily assembled and disassembled coupling between a lift arm of a loader or the like and the fluid motor which operates the arm. A pair of plates are disposed one on either side of the lift arm and each has a lower portion extending a small distance below the arm. One end of the fluid motor is received between the lower portions of the plates and a pivot connection is provided therebetween. The plates are secured to the lift arm itself by a pair of removable cross pins which are widely spaced apart along the length of the lift arm to distribute stress forces. In a preferred form of the invention a pair of supplementary cross bolts extend between the two plates at the level of the lower edge of the lift arm to retain the plates together in the event that the primary load bearing cross pins should become loose. The supplementary cross bolts serve a further purpose of facilitating positioning of the lift arm during assembly.
Accordingly, it is an object of this invention to provide for a very high strength but low cost coupling of a loader lift arm to a lift cylinder which coupling may be readily assembled and disassembled and which distributes stress forces along the arm rather than concentrating such forces at a small limited region thereof.
The invention, together with further objects and advantages thereof will be better understood by reference to the following description of a preferred embodiment taken in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING In the accompanying drawing:
FIG. 1 is an elevation view of the forward portion of a loader vehicle embodying the present invention,
FIG. 2 is a side view of a portion of the apparatus of FIG. 1 further illustrating the coupling between a lift arm and fluid motor thereof.
FIG. 3 is a plan view of the structure shown in FIG. 2.
DESCRIPTION OF A PREFERRED EMBODIMENT Referring now to the drawing and more particularly to FIG. 1 thereof, there is shown a portion of a loader vehicle 11 of the type having a bucket 12 carried at the forward end of lift arms 13. The lift arms 13 which have a slight S-curvature in this particular example are coupled to the body 14 of the vehicle by a first pivot connection 16 which enables the forward end of the lift arm together with bucket 12 to be lowered whereby the bucket may receive material upon forward motion of the vehicle and which enables the lift arms and bucket to be elevated for the purpose of carrying the material to another area where the material may be dumped. In most loaders, the bucket 12 is coupled to the forward end of the lift arms by another pivot connection 17. Tilt linkage 18, including an extensible and contractible fluid operated tilt cylinder 19, is provided to enable selective pivoting of the bucket relative to the lift arms. Suitable detailed construction for the loader vehicle 11, bucket 12 and tilt linkage 18 are known to the art and accordingly will not be further described.
In order to selectively raise and lower the lift arm 13 and thus the bucket 12, lift cylinders 21, which may be extensible and contractible hydraulic fluid motors, each have a head end coupled to the body 14 of a vehicle at a pivot connection 22 and extend upwardly and forwardly therefrom towards the underside of a central portion of an associated one of the lift arms 13. Referring now to FIGS. 2 and 3 in conjunction, the coupling 23 between each lift arm I3 and lift cylinder 21 is formed in part by a pair of plates 24 of substantially triangular configuration disposed one on each side of a central portion of the associated lift arm 13. Each such plate 24 has one corner 26 extending below the level of the adjacent portion of the lift arm 13. The upper end of the lift cylinder rod 27, including a transverse sleeve 28 carried thereon, is received between the lower portions 26 of the plates. A transverse pin 29 ex tends through plate portions 26 and sleeve 28 to form a pivot connection between the cylinder 21 and the lift arm.
A pair of spaced apart supplementary cross pins formed by bolts 34 extend between the plates 24 immediately below the undersurface of the arm 13. Bolts 34 serve to hold the plates 24 in operative position in the event that the primary loan bearingmembers. the cross pins 32, should become loosened in operation-Bolts 34 when positioned as described above also facilitate assembly and disassembly of the coupling 23 by serving as a means for positioning the lift arm 13 relative to the plates 24 during installation or removal of the cross pins 32.
While the invention has been described with respect to a single embodiment, it will be apparent that modifications are possible and it is not intended to limit the invention except as defined in the following claims.
What is claimed is:
1. Lift arm mechanism for a loader vehicle which has an elevatable bucket for receiving and lifting material comprising:
a lift arm having first and second ends and having an intermediate section between said ends,
first pivot means for coupling said first end of said lift arm to said vehicle and providing for raising and lowering of said second end thereof,
means for attaching said bucket to said second end of said lift arm.
a pair of plates disposed adjacent said intermediate section of said lift arm each being at a separate side thereof and each having a lower portion extending below said lift arm,
a linear fluid motor having one end pivotally connected'to said vehicle and having an opposite end extending between said lower portions of said plates,
second pivot means coupling said opposite end of said fluid motor to said lower portions of said plates,
a pair of removable cross pins each being transpierced through said plates and said intermediate section of said lift arm at spaced apart positions along said intermediate section of said arm with one of said cross pins being situated closer to said first end of arm than said second pivot means and the other of said cross pins being close. to said second end of said arm than said second pivot means whereby stress forces are divided between spaced apart regions of said lift arm. and a pair of spaced apart supplementary cross pins extending between said lower portions of said plates below said lift arm.
2. The combination defined in claim 1 wherein said cross pins are of the form having bolt means for axially compressing said pins to thereby cause radial expansion of said pins to wedge said pins in said plates.
3. The combination defined in claim 1 wherein said supplementary cross pins extend between said plates immediately below the lower surface of said lift arm.
* l l l
Claims (3)
1. Lift arm mechanism for a loader vehicle which has an elevatable bucket for receiving and lifting material comprising: a lift arm having first and second ends and having an intermediate section between said ends, first pivot means for coupling said first end of said lift arm to said vehicle and providing for raising and lowering of said second end thereof, means for attaching said bucket to said second end of said lift arm, a pair of plates disposed adjacent said intermediate section of said lift arm each being at a separate side thereof and each having a lower portion extending below said lift arm, a linear fluid motor having one end pivotally connected to said vehicle and having an opposite end extending between said lower portions of said plates, second pivot means coupling said opposite end of said fluid motor to said lower portions of said plates, a pair of removable cross pins each being transpierced through said plates and said intermediate section of said lift arm at spaced apart positions along said intermediate section of said arm with one of said cross pins being situated closer to said first end of arm than said second pivot means and the other of said cross pins being closer to said second end of said arm than said second pivot means whereby stress forces are divided between spaced apart regions of said lift arm, and a pair of spaced apart supplementary cross pins extending between said lower portions of said plates below said lift arm.
2. The combination defined in claim 1 wherein said cross pins are of the form having bolt means for axially compressing said pins to thereby cause radial expansion of said pins to wedge said pins in said plates.
3. The combination defined in claim 1 wherein said supplementary cross pins extend between said plates immediately below the lower surface of said lift arm.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US408667A US3884378A (en) | 1973-10-23 | 1973-10-23 | Lift arm assembly for loader vehicles |
| CA207,406A CA1006465A (en) | 1973-10-23 | 1974-08-20 | Lift arm assembly for loader vehicles and the like |
| BR7599/74A BR7407599D0 (en) | 1973-10-23 | 1974-09-12 | MECHANISM FOR A LOADER ARM ON A LOADER |
| JP10659874A JPS5735330B2 (en) | 1973-10-23 | 1974-09-12 | |
| BE149809A BE821394A (en) | 1973-10-23 | 1974-10-23 | ASSEMBLY WITH ELEVATORS FOR LOADERS AND SIMILAR VEHICLES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US408667A US3884378A (en) | 1973-10-23 | 1973-10-23 | Lift arm assembly for loader vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3884378A true US3884378A (en) | 1975-05-20 |
Family
ID=23617235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US408667A Expired - Lifetime US3884378A (en) | 1973-10-23 | 1973-10-23 | Lift arm assembly for loader vehicles |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3884378A (en) |
| JP (1) | JPS5735330B2 (en) |
| BE (1) | BE821394A (en) |
| BR (1) | BR7407599D0 (en) |
| CA (1) | CA1006465A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4006834A (en) * | 1976-01-15 | 1977-02-08 | Caterpillar Tractor Co. | Tilt linkage for loader buckets |
| DE2827283A1 (en) * | 1977-06-23 | 1979-01-11 | Caterpillar Tractor Co | CARRIER ARRANGEMENT |
| US4162872A (en) * | 1977-12-13 | 1979-07-31 | Caterpillar Tractor Co. | Lift arm assembly |
| US4725189A (en) * | 1986-09-15 | 1988-02-16 | Westendorf Mfg. Co., Inc. | Rear-mounted loader bucket for a tractor including roll-back means |
| WO1993013002A1 (en) * | 1989-11-22 | 1993-07-08 | Intermodal Technologies, Inc. | Bulk materials transportation system |
| US5238357A (en) * | 1989-11-22 | 1993-08-24 | Intermodal Technologies, Inc. | Bulk materials transportation system |
| US5256023A (en) * | 1989-11-22 | 1993-10-26 | Intermodal Technologies, Inc. | Roll-out forklift for bulk materials transportation system |
| FR2694316A1 (en) * | 1992-07-31 | 1994-02-04 | Pel Job Groupe | Loader-excavator-elevator vehicle implement - has arm at free end of shaft and tool mounted on arm |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61102404A (en) * | 1984-10-24 | 1986-05-21 | 百々株式会社 | Hat having flexible recoverable visor core material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2621817A (en) * | 1948-08-27 | 1952-12-16 | Int Harvester Co | Tractor-mounted power loader |
| US3363792A (en) * | 1965-12-20 | 1968-01-16 | Pacific Car & Foundry Co | Boom assembly for front end loaders |
| US3411647A (en) * | 1967-02-23 | 1968-11-19 | Int Harvester Co | Boom assembly for tractor loader |
| US3606061A (en) * | 1969-06-23 | 1971-09-20 | Letourneau Inc | Front end loader type vehicle |
| US3716159A (en) * | 1971-02-17 | 1973-02-13 | Caterpillar Tractor Co | Automatic valve control mechanism for vehicle mounted implements |
-
1973
- 1973-10-23 US US408667A patent/US3884378A/en not_active Expired - Lifetime
-
1974
- 1974-08-20 CA CA207,406A patent/CA1006465A/en not_active Expired
- 1974-09-12 BR BR7599/74A patent/BR7407599D0/en unknown
- 1974-09-12 JP JP10659874A patent/JPS5735330B2/ja not_active Expired
- 1974-10-23 BE BE149809A patent/BE821394A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2621817A (en) * | 1948-08-27 | 1952-12-16 | Int Harvester Co | Tractor-mounted power loader |
| US3363792A (en) * | 1965-12-20 | 1968-01-16 | Pacific Car & Foundry Co | Boom assembly for front end loaders |
| US3411647A (en) * | 1967-02-23 | 1968-11-19 | Int Harvester Co | Boom assembly for tractor loader |
| US3606061A (en) * | 1969-06-23 | 1971-09-20 | Letourneau Inc | Front end loader type vehicle |
| US3716159A (en) * | 1971-02-17 | 1973-02-13 | Caterpillar Tractor Co | Automatic valve control mechanism for vehicle mounted implements |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4006834A (en) * | 1976-01-15 | 1977-02-08 | Caterpillar Tractor Co. | Tilt linkage for loader buckets |
| DE2827283A1 (en) * | 1977-06-23 | 1979-01-11 | Caterpillar Tractor Co | CARRIER ARRANGEMENT |
| US4134507A (en) * | 1977-06-23 | 1979-01-16 | Caterpillar Tractor Co. | Flexing beam assembly |
| FR2395362A1 (en) * | 1977-06-23 | 1979-01-19 | Caterpillar Tractor Co | FLEXIBLE ARROW |
| US4162872A (en) * | 1977-12-13 | 1979-07-31 | Caterpillar Tractor Co. | Lift arm assembly |
| US4725189A (en) * | 1986-09-15 | 1988-02-16 | Westendorf Mfg. Co., Inc. | Rear-mounted loader bucket for a tractor including roll-back means |
| WO1993013002A1 (en) * | 1989-11-22 | 1993-07-08 | Intermodal Technologies, Inc. | Bulk materials transportation system |
| US5238357A (en) * | 1989-11-22 | 1993-08-24 | Intermodal Technologies, Inc. | Bulk materials transportation system |
| US5256023A (en) * | 1989-11-22 | 1993-10-26 | Intermodal Technologies, Inc. | Roll-out forklift for bulk materials transportation system |
| FR2694316A1 (en) * | 1992-07-31 | 1994-02-04 | Pel Job Groupe | Loader-excavator-elevator vehicle implement - has arm at free end of shaft and tool mounted on arm |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5735330B2 (en) | 1982-07-28 |
| BE821394A (en) | 1975-04-23 |
| BR7407599D0 (en) | 1975-08-05 |
| JPS5073404A (en) | 1975-06-17 |
| CA1006465A (en) | 1977-03-08 |
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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 |
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| STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |