US3015497A - Stabilizer pad - Google Patents
Stabilizer pad Download PDFInfo
- Publication number
- US3015497A US3015497A US794057A US79405759A US3015497A US 3015497 A US3015497 A US 3015497A US 794057 A US794057 A US 794057A US 79405759 A US79405759 A US 79405759A US 3015497 A US3015497 A US 3015497A
- Authority
- US
- United States
- Prior art keywords
- pad
- stabilizer
- ground
- hoe
- tractor
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D49/00—Tractors
- B62D49/02—Tractors modified to take lifting devices
-
- 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
- E02F3/30—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 a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/32—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 a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
-
- 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
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
- E02F3/382—Connections to the frame; Supports for booms or arms
- E02F3/384—Connections to the frame; Supports for booms or arms the boom being pivotable relative to the frame about a vertical axis
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/085—Ground-engaging fitting for supporting the machines while working, e.g. outriggers, legs
Definitions
- This invention relates to stabilizers for vehicles, particularly for tractors, trucks and like vehicles which carry equipment such as diggers, cranes, hoist apparatus, etc.
- the invention is especially concerned with an improved stabilizer pad, that is, the part that engages the ground when the stabilizer is lowered to stabilize the vehicle against tipping due to ofl-center loads imposed on it by operation of the mounted implement.
- a rigid pad carried by a stabilizer arm is moved from a folded position to an operative position when the back-hoe is made ready for digging.
- the pad In the operative position, the pad is forced into contact with the ground, the condition of which varies greatly in that it may be smooth, uneven, hard, soft, wet or dry.
- the stabilizer arms are usually of variable length to compensate for uneven terrain generally, but local roughness or unevenness is not compensated for.
- FIG. 1 is a perspective veiw of a tractor-mounted backhoe with stabilizers embodying my invention mounted on the back-hoe frame;
- FIG. 2 is an enlarged sectional view of the stabilizer arm and pad mounting
- FIG. 3 is a view like FIG. 2, but showing the parts in different relative positions.
- a back-hoe having a swing frame 12 is mounted in a tractor 14 of the so called industrial type.
- the back-hoe frame 16 carries oppositely disposed stabilizers having arms 18 and pads 20.
- the arms 18 are preferably of box-section and are pivotally mounted at 22 to the main frame 16 of the back-hoe.
- a control arm 24 is pivotally connected to arm 18 at 26, and at its other end to a cylinder 30 at 28.
- the cylinder 30 is movable vertically on a piston rod 32 under the influence of hydraulic pressure from the fluid pressure supply of the implement (not shown). This structure is duplicated on the other side of the vehicle.
- the back-hoe 10 has the usual dipper, boom, actuating cylinders, etc., which have nothing to do with the present invention so will not be described. While a backhoe has been shown by way of example, the advantages of my invention are equally applicable to other tractor (or truck) mounted implements.
- the stabilizers are normally folded with the pads 20 out of ground contact. This is accomplished by admitting pressure fluid to the bottom of cylinders 30 which causes upward movement of said cylinders on the rods 32 which, in turn, causes the arms 18 to be swung upwardly about the pivots 22.
- the stabilizers When the tractor arrives at a work site, the stabilizers are swung into ground engaging position preparatory to digging. This is accomplished by admitting pressure fluid into the upper ends of cylinder 30 which moves the inner ends of arms 24 downwardly and sets the pads 20 firmly on and into the ground.
- the pad 20 is conical in shape and is preferably formed of steel.
- the arm 18 has a boss 34 welded on its outer end.
- a stud 36 formed with a shoulder 38 is fixed in the boss by means of a nut 40 which threadedly engages the upper end portion thereof.
- the lower end of the stud is formed with a ball 42 which is retained in nested engagement with the pad 20 at the apex thereof by a cap 44.
- the latter is formed in the shape of a truncated cone and is welded to the pad around the base thereof.
- the pad 20 may rotate around the ball 42 and is permitted limited angular movement relative to the axis of the stud 36. In fact, the pad 20 has limited universal movement about the ball 42.
- This universal movement permits self adjustment of the pad as it is moved into ground engagement such that the maximum area of the pad is engaged with the terrain on which it rests.
- the pad will embed itself in the position shown in FIGS. 1 and 3 and present a substantial area of the conic surface to the ground.
- any local hard spot, rock or obstruction will cause the pad to rotate or rock away from this local resistance and thus present an enlarged area to the adjacent softer terrain.
- This action will be stable provided there is suflicient bearing resistance within the limits encompassed by the pad area in contact, and provided that the hinge point is below the center of effort or the metacentric center of the conic column.
- Such placing of the pad will produce some stabilizing motion which will compensate for load variation during operation of the digger or other element.
- a stabilizer for mobile equipment comprising, in combination: a stabilizer arm, a dished ground engaging pad formed of a surface of revolution having the general form of a flat, inverted cone, and means, including a pivot located centrally of the pad and immediately above the bottom of the inverted cone, mounting the pad for pivotal movement on the end of the stabilizer.
- a stabilizer for mobile equipment comprising, in combination: a,stabilizer arm, a dished ground engaging pad formed of a surface of revolution having the general form of a flat, inverted cone, and means, including a pivot located centrally of the pad and immediately above the bottom of the inverted cone, mounting the pad for limited universal movement on the end of the stabilizer.
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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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Soil Working Implements (AREA)
Description
Jan. 2, 1962 J, ALDRED, JR. 3,015,497
STABILIZER PAD Filed Feb. 18, 1959 INVENTOR. J a%/? l. flZJ/ad J United States Patent Ofice 3,015,497 Patented Jan. 2, 1962 3,015,497 STABILIZER PAD John L. Aldred, Jr., Bloomfield Hills, Mich, assignor, by
mesne assignments, to Ford Motor Company, a corporation of Delaware Filed Feb. 18, 1959, Ser. No. 794,057 2 Claims. (Cl. 280-150) This invention relates to stabilizers for vehicles, particularly for tractors, trucks and like vehicles which carry equipment such as diggers, cranes, hoist apparatus, etc. The invention is especially concerned with an improved stabilizer pad, that is, the part that engages the ground when the stabilizer is lowered to stabilize the vehicle against tipping due to ofl-center loads imposed on it by operation of the mounted implement.
In the use of such implements on mobile equipment, such as for example, tractor mounted back-hoes, a rigid pad carried by a stabilizer arm is moved from a folded position to an operative position when the back-hoe is made ready for digging. In the operative position, the pad is forced into contact with the ground, the condition of which varies greatly in that it may be smooth, uneven, hard, soft, wet or dry. The stabilizer arms are usually of variable length to compensate for uneven terrain generally, but local roughness or unevenness is not compensated for.
Attempts to improve stabilizers by hinging the pad above their centers of effort to compensate for uneven local terrain have been unsuccessful because the pads rock and are unstable. A possible exception is when a hinged pad is used on a very hard surface such as concrete, macadam or an auxilairy platform of large area.
In the normal use of a tractor mounted back-hoe or similar implement, all kinds of different supporting surfaces are encountered and my improved stabilizer will operate on any surface capable of supporting the load imposed without difficulty and with excellent stability.
Accordingly, it is the object of my invention to provide an improved stabilizer and stabilizer pad for mobile equipment which will overcome the aforesaid difiiculties.
Reference is made to the accompanying drawing for a specfiic example of my improved device. In the drawmg:
FIG. 1 is a perspective veiw of a tractor-mounted backhoe with stabilizers embodying my invention mounted on the back-hoe frame;
FIG. 2 is an enlarged sectional view of the stabilizer arm and pad mounting; and
FIG. 3 is a view like FIG. 2, but showing the parts in different relative positions.
Referring to FIG. 1, it will be seen that a back-hoe having a swing frame 12 is mounted in a tractor 14 of the so called industrial type. The back-hoe frame 16 carries oppositely disposed stabilizers having arms 18 and pads 20. The arms 18 are preferably of box-section and are pivotally mounted at 22 to the main frame 16 of the back-hoe. A control arm 24 is pivotally connected to arm 18 at 26, and at its other end to a cylinder 30 at 28. The cylinder 30 is movable vertically on a piston rod 32 under the influence of hydraulic pressure from the fluid pressure supply of the implement (not shown). This structure is duplicated on the other side of the vehicle.
The back-hoe 10 has the usual dipper, boom, actuating cylinders, etc., which have nothing to do with the present invention so will not be described. While a backhoe has been shown by way of example, the advantages of my invention are equally applicable to other tractor (or truck) mounted implements.
During travel of the tractor 14, the stabilizers are normally folded with the pads 20 out of ground contact. This is accomplished by admitting pressure fluid to the bottom of cylinders 30 which causes upward movement of said cylinders on the rods 32 which, in turn, causes the arms 18 to be swung upwardly about the pivots 22.
When the tractor arrives at a work site, the stabilizers are swung into ground engaging position preparatory to digging. This is accomplished by admitting pressure fluid into the upper ends of cylinder 30 which moves the inner ends of arms 24 downwardly and sets the pads 20 firmly on and into the ground.
As will be seen from FIGS. 2 and 3, the pad 20 is conical in shape and is preferably formed of steel. The arm 18 has a boss 34 welded on its outer end. A stud 36 formed with a shoulder 38 is fixed in the boss by means of a nut 40 which threadedly engages the upper end portion thereof. The lower end of the stud is formed with a ball 42 which is retained in nested engagement with the pad 20 at the apex thereof by a cap 44. The latter is formed in the shape of a truncated cone and is welded to the pad around the base thereof.
It will be understood from the figures that the pad 20 may rotate around the ball 42 and is permitted limited angular movement relative to the axis of the stud 36. In fact, the pad 20 has limited universal movement about the ball 42.
This universal movement permits self adjustment of the pad as it is moved into ground engagement such that the maximum area of the pad is engaged with the terrain on which it rests. In soft ground the pad will embed itself in the position shown in FIGS. 1 and 3 and present a substantial area of the conic surface to the ground. In relatively hard or rocky terrain, as the pad is being set, any local hard spot, rock or obstruction will cause the pad to rotate or rock away from this local resistance and thus present an enlarged area to the adjacent softer terrain. This action will be stable provided there is suflicient bearing resistance within the limits encompassed by the pad area in contact, and provided that the hinge point is below the center of effort or the metacentric center of the conic column. Such placing of the pad will produce some stabilizing motion which will compensate for load variation during operation of the digger or other element.
Iclaim:
1. A stabilizer for mobile equipment, comprising, in combination: a stabilizer arm, a dished ground engaging pad formed of a surface of revolution having the general form of a flat, inverted cone, and means, including a pivot located centrally of the pad and immediately above the bottom of the inverted cone, mounting the pad for pivotal movement on the end of the stabilizer.
2. A stabilizer for mobile equipment, comprising, in combination: a,stabilizer arm, a dished ground engaging pad formed of a surface of revolution having the general form of a flat, inverted cone, and means, including a pivot located centrally of the pad and immediately above the bottom of the inverted cone, mounting the pad for limited universal movement on the end of the stabilizer.
References Cited in the file of this patent UNITED STATES PATENTS 1,093,750 Welby Apr. 21, 1914 1,494,161 Fairbanks May 13, 1924 1,574,679 Nilsson Feb. 23, 1926 1,958,114- Robinson May 8, 1934 2,375,264 Wagner et al. May 8, 1945 2,870,924 Wills Jan. 27, 1959
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US794057A US3015497A (en) | 1959-02-18 | 1959-02-18 | Stabilizer pad |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US794057A US3015497A (en) | 1959-02-18 | 1959-02-18 | Stabilizer pad |
Publications (1)
Publication Number | Publication Date |
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US3015497A true US3015497A (en) | 1962-01-02 |
Family
ID=25161560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US794057A Expired - Lifetime US3015497A (en) | 1959-02-18 | 1959-02-18 | Stabilizer pad |
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US (1) | US3015497A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3262517A (en) * | 1964-11-18 | 1966-07-26 | Jerry P Malec | Bridge crane |
US3442530A (en) * | 1966-03-22 | 1969-05-06 | Gabriel L Guinot | Method of operating extendable and retractable stabilising stays or props of public works vehicles and an hydraulic system for carrying out said method |
US3485321A (en) * | 1967-11-20 | 1969-12-23 | Smith Raymond E Jun | Work tower |
US3596735A (en) * | 1969-10-30 | 1971-08-03 | Howard H Denier | Portable elevator working and load-lifting platform |
US3701226A (en) * | 1971-01-20 | 1972-10-31 | Cooper Ind Inc | Adjustable positionable structural device |
USRE28455E (en) * | 1969-10-30 | 1975-07-01 | Portable elevator working and load-lifting platform | |
US20110227313A1 (en) * | 2010-03-22 | 2011-09-22 | Jack Butler | Jiffy stand / kick stand having attached plate |
US20120283746A1 (en) * | 2011-05-02 | 2012-11-08 | Hstar Technologies | Mobile Medical Robotic System |
US20140265283A1 (en) * | 2013-03-15 | 2014-09-18 | Jeff Tad Clifton | Service Vehicle Operation Training System and Method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1093750A (en) * | 1913-04-23 | 1914-04-21 | Harry S Welby | Combination tripod and staff. |
US1494161A (en) * | 1922-06-06 | 1924-05-13 | Charles C Fairbanks | Clothesline prop |
US1574679A (en) * | 1922-03-24 | 1926-02-23 | Nilsson Fritz Albert | Supporting and propelling mechanism for motor vehicles |
US1958114A (en) * | 1933-03-27 | 1934-05-08 | Curtiss Aerocar Company Inc | Jack |
US2375264A (en) * | 1944-02-09 | 1945-05-08 | Harold A Wagner | Vehicle stabilizing arrangement |
US2870924A (en) * | 1956-01-16 | 1959-01-27 | Shawnee Mfg Company Inc | Bucket and bucket arm control for booms |
-
1959
- 1959-02-18 US US794057A patent/US3015497A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1093750A (en) * | 1913-04-23 | 1914-04-21 | Harry S Welby | Combination tripod and staff. |
US1574679A (en) * | 1922-03-24 | 1926-02-23 | Nilsson Fritz Albert | Supporting and propelling mechanism for motor vehicles |
US1494161A (en) * | 1922-06-06 | 1924-05-13 | Charles C Fairbanks | Clothesline prop |
US1958114A (en) * | 1933-03-27 | 1934-05-08 | Curtiss Aerocar Company Inc | Jack |
US2375264A (en) * | 1944-02-09 | 1945-05-08 | Harold A Wagner | Vehicle stabilizing arrangement |
US2870924A (en) * | 1956-01-16 | 1959-01-27 | Shawnee Mfg Company Inc | Bucket and bucket arm control for booms |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3262517A (en) * | 1964-11-18 | 1966-07-26 | Jerry P Malec | Bridge crane |
US3442530A (en) * | 1966-03-22 | 1969-05-06 | Gabriel L Guinot | Method of operating extendable and retractable stabilising stays or props of public works vehicles and an hydraulic system for carrying out said method |
US3485321A (en) * | 1967-11-20 | 1969-12-23 | Smith Raymond E Jun | Work tower |
US3596735A (en) * | 1969-10-30 | 1971-08-03 | Howard H Denier | Portable elevator working and load-lifting platform |
USRE28455E (en) * | 1969-10-30 | 1975-07-01 | Portable elevator working and load-lifting platform | |
US3701226A (en) * | 1971-01-20 | 1972-10-31 | Cooper Ind Inc | Adjustable positionable structural device |
US20110227313A1 (en) * | 2010-03-22 | 2011-09-22 | Jack Butler | Jiffy stand / kick stand having attached plate |
US20120283746A1 (en) * | 2011-05-02 | 2012-11-08 | Hstar Technologies | Mobile Medical Robotic System |
US20120283872A1 (en) * | 2011-05-02 | 2012-11-08 | Hstar Technologies | System for Stabilization Control of Mobile Robotics |
US9440357B2 (en) * | 2011-05-02 | 2016-09-13 | John Hu | System for stabilization control of mobile robotics |
US20140265283A1 (en) * | 2013-03-15 | 2014-09-18 | Jeff Tad Clifton | Service Vehicle Operation Training System and Method |
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