US3161072A - Control arrangements and mechanisms for pivotable devices - Google Patents

Control arrangements and mechanisms for pivotable devices Download PDF

Info

Publication number
US3161072A
US3161072A US227877A US22787762A US3161072A US 3161072 A US3161072 A US 3161072A US 227877 A US227877 A US 227877A US 22787762 A US22787762 A US 22787762A US 3161072 A US3161072 A US 3161072A
Authority
US
United States
Prior art keywords
rack
pivotable
pinion
output pinion
main frame
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
Application number
US227877A
Inventor
Robert G Letourneau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US227877A priority Critical patent/US3161072A/en
Application granted granted Critical
Publication of US3161072A publication Critical patent/US3161072A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
    • 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
    • E02F3/7609—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/188—Reciprocating or oscillating to or from alternating rotary including spur gear
    • Y10T74/18808—Reciprocating or oscillating to or from alternating rotary including spur gear with rack
    • Y10T74/18816—Curvilinear rack
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/1967—Rack and pinion

Definitions

  • My invention relates to improvements in control arrangements and mechanisms for .pivotable devices, and more particularly to such arrangements and mechanisms for a pivotable device mounting a work tool and wherein a powered rack is employed.
  • pivotable mechanisms such as dozer blades and aprons for scraper buckets
  • pivotable mechanisms such as dozer blades and aprons for scraper buckets
  • the length of rack is connected at one end to the pivotable structure and is straight.
  • This makes it necessary to provide a pair of back-up rollers journaled so as to bear against the back surface of the rack Opposite the region of the intermeshing rack and pinion.
  • the back-up rollers must be mounted so as to allow some pivoting movement about the pinion axis. While this manner of controlling pivotable structures is disclosed in the prior art, it is recognized that it is not entirely satisfactory and that new and useful improvements may be made therein.
  • Another object of my invention is to provide, for controlling a pivotable device, a mechanism employing a rack and only a single back-up roller.
  • Another object of my invention is to provide, for controlling a pivotable device, a mechanism employing a rack, that is simpler and more economical than those heretofore available.
  • an arcuate length of rack having one end connected to a pivotable device with the pitch line of the rack teeth being an arc of a circle having its center at the pivot axis of said device.
  • a gear reduction is fixedly mounted on a support structure adjacent the rack and has an output pinion engaging the rack.
  • a single hack-up roller is fixedly mounted in radial alignment with the output pinion and the pivotable device so as to rollab-ly engage the back surface of the rack.
  • FIG. 1 is a schematic fragmentary plan view of the front end portion of an earthworking machine employing a control arrangement and mechanism for a pivotable device in accordance with a preferred embodiment of my invention
  • FIG. 2 is a schematic fragmentary side elevational view of the front end portion of the machine of FIG. 1, in one operative position.
  • FIG. 1 there is shown the front end portion 11 of an earthworking machine having a main frame 13, which is supported at the front end by a pair of electric motor-driven wheels 15, 17 and an axle 19.
  • a dozer blade 21 extends transversely in front of the machine and is provided at the extremities thereof with support arms 23, 25.
  • the ends of the support arms are provided with sockets 27, 29 each of which engages a respective ball 31, 33.
  • These balls are fixedly mounted on the extremities of support structures 35, 37 projecting artists Patented Dec. 15, 1964 outwardly from the sides of the main frame 13 a distance which is suiiicient to provide suitable clearance between the arms 23, 25 and the respective Wheels 15, 17.
  • the support arms Z3, 25 are provided with a pair of tubular braces 39, 41, lying in parallel vertical planes and connecting the upper edge of the blade 21 and the upper surface of the arms 23, 25.
  • a similar pair of tubular braces 43, 45 are disposed in a common horizontal plane and connect the back surface of the dozer blade and the inner vertical surface of the arms 23, 25.
  • the dozer blade 21 is provided with a curved'front surface 47, to the-lower edge of which is attached a cutting edge 49.
  • a pair of hinge side plates 51, 53 are fixed to and extend rearwardly from the central lower back edge of the blade 21.
  • a length of arcuate rack 55, having a goose-neck bend 57 at one end, is journaled between the hinge plates 51, 53 on a pivot or hinge pin 59.
  • rack 55 is formed to the arc of a circle having its center on the center line connecting the balls 31, 33, which is the axis of rotation of the blade 21.
  • the rack teeth are disposed rearwardly, preferably, as shown in FIG. 2.
  • a gear reduction 61 which is driven by an electric motor 63, is fixed to one end of a suitable support structure that is rigdly connected, at the other end, near the mid point of the axle 19.
  • the gear reduction 61 is provided with an output pinion 67 which engages the teeth of the arcuate rack 55.
  • a single back-up roller 69 is mounted on a shaft 71 which is journaled in a pair of plates 70, 72 that are suitably fixed to the gear reduction 61.
  • the single back-up roller 69 is not pivotable, but is so mounted in the side plates 7% 72 that it is in continuous rollable engagement with the back of the arcuate rack 55.
  • An operators cab and control station 73 is conveniently located centrally between the front wheels and in an elevated position above the main frame 13.
  • FIG. 2 In order to describe the manner in which the control mechanism operates, reference is made to FIG. 2.
  • the blade 21 In the operative position shown, the blade 21 is disposed so that the cutting edge 49 is in an earth-engaging position.
  • the weight of the blade, rack and a portion of the support arms is upheld by the support structure 65 through the pinion 6'7 and the gear reduction 61.
  • the single back-up roller 69 rollably engages the back surface of the rack and maintains the pinion 67 in positive engagement With the rack teeth.
  • the single non-pivotable back-up roller is disposed in radial alignment with the output pinion and the pivotable device.
  • the only purpose of the single roller is to react in line with the outward radial thrust of the pinion when moving the rack.
  • the single back-up roller maintains the rack and pinion in continuous engagement.
  • a movement control mechanism for such earth engaging structure which comprises: a powered gear reduction mounted on said main frame above said earth engaging structure and having an output pinion; an arcuate length of rack connected at one end to said earth engaging structure and engaging said output pinion; and a single back-up roller journally mounted in a fixed position adjacent said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
  • a movement control mechanism for such structure which comprises: a powered gear reduction mounted on said main frame above said structure and having an output pinion; an arcuate length of rack connected at one end to said structure and having teeth engaging said pinion, said rack being so formed that the pitch line of the teeth thereof is the arc of a circle having its center on said axis of rotation of said pivotable structure; and a single back-up roller journally mounted in a fixed position adjacent said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
  • a control mechanism for a pivotable work tool structure mounted for movement about an axis which comprises: an arcuate length of rack connected at one end to said pivotable structure and having teeth so arranged that the pitch line thereof is the arc of a circle having its center on said axis; support means fixed relative to said rack teeth pitch line; a powered gear reduction fixedly mounted on said support means and having an output pinion engaging said rack; and a single back-up roller journally mounted in a fixed position relative to said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
  • a movement control mechanism for such pivotable structure which comprises: an arcuate length of rack connected at one end to said pivotable structure and having teeth so arranged that the pitch line thereof is the are of a circle having its center on said axis; support means mounted on said main frame and fixed relative to said rack teeth pitch line; a powered gear reduction fixedly mounted on said support means and having an output pinion engaging said rack; and a single back-up roller journally mounted in a fixed position relative to said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)

Description

Dec. 15, 1964 R. G. LE TOURNEAU 3,161,072
CONTROL ARRANGEMENTS AND MECHANISMS FOR PIVOTABLE DEVICES Filed on. 2, 1962 NIL-5i INVENTOR. 750% 6116 /EMVWWZM nited States Patent 3,161,072 (IGNQL ANGER TENTS AND MEQHANEMS FOR PTVQBTABLE DEVTCES Robert G. Le'lourneau, R0. Box 2307, Longview, Tex.
Filed Get. 2, 1962, Ser. No. 227,877
4- Claims. (Cl. 74--42Z) My invention relates to improvements in control arrangements and mechanisms for .pivotable devices, and more particularly to such arrangements and mechanisms for a pivotable device mounting a work tool and wherein a powered rack is employed.
Many structures which are disposed to pivot about axes may be suitably moved and controlled by rack and pinion mechanisms. In some earthwork-ing machines, for example, it is not unusual for pivotable mechanisms, such as dozer blades and aprons for scraper buckets, to be actuated and controlled by a length of rack and a powered gear reduction having an output pinion engaging the rack. The length of rack is connected at one end to the pivotable structure and is straight. This makes it necessary to provide a pair of back-up rollers journaled so as to bear against the back surface of the rack Opposite the region of the intermeshing rack and pinion. Furthermore, the back-up rollers must be mounted so as to allow some pivoting movement about the pinion axis. While this manner of controlling pivotable structures is disclosed in the prior art, it is recognized that it is not entirely satisfactory and that new and useful improvements may be made therein.
Accordingly, it is the general object of my invention to provide improved control arrangements and mecha nisms for pivotable devices.
Another object of my invention is to provide, for controlling a pivotable device, a mechanism employing a rack and only a single back-up roller.
Another object of my invention is to provide, for controlling a pivotable device, a mechanism employing a rack, that is simpler and more economical than those heretofore available.
More particularly, in accordance with the present invention, there is provided an arcuate length of rack having one end connected to a pivotable device with the pitch line of the rack teeth being an arc of a circle having its center at the pivot axis of said device. A gear reduction is fixedly mounted on a support structure adjacent the rack and has an output pinion engaging the rack. A single hack-up roller is fixedly mounted in radial alignment with the output pinion and the pivotable device so as to rollab-ly engage the back surface of the rack.
For a further understanding of my invention and further objects, features, and advantages thereof, reference may now be had to the following description taken in conjunction with the accompanying drawing in which:
FIG. 1 is a schematic fragmentary plan view of the front end portion of an earthworking machine employing a control arrangement and mechanism for a pivotable device in accordance with a preferred embodiment of my invention; and
FIG. 2 is a schematic fragmentary side elevational view of the front end portion of the machine of FIG. 1, in one operative position.
Referring now to the drawing, in FIG. 1, there is shown the front end portion 11 of an earthworking machine having a main frame 13, which is supported at the front end by a pair of electric motor-driven wheels 15, 17 and an axle 19. A dozer blade 21 extends transversely in front of the machine and is provided at the extremities thereof with support arms 23, 25. The ends of the support arms are provided with sockets 27, 29 each of which engages a respective ball 31, 33. These balls are fixedly mounted on the extremities of support structures 35, 37 projecting artists Patented Dec. 15, 1964 outwardly from the sides of the main frame 13 a distance which is suiiicient to provide suitable clearance between the arms 23, 25 and the respective Wheels 15, 17. The support arms Z3, 25 are provided with a pair of tubular braces 39, 41, lying in parallel vertical planes and connecting the upper edge of the blade 21 and the upper surface of the arms 23, 25. A similar pair of tubular braces 43, 45 are disposed in a common horizontal plane and connect the back surface of the dozer blade and the inner vertical surface of the arms 23, 25.
The dozer blade 21 is provided with a curved'front surface 47, to the-lower edge of which is attached a cutting edge 49. A pair of hinge side plates 51, 53 are fixed to and extend rearwardly from the central lower back edge of the blade 21. A length of arcuate rack 55, having a goose-neck bend 57 at one end, is journaled between the hinge plates 51, 53 on a pivot or hinge pin 59. The
. rack 55 is formed to the arc of a circle having its center on the center line connecting the balls 31, 33, which is the axis of rotation of the blade 21. The rack teeth are disposed rearwardly, preferably, as shown in FIG. 2. A gear reduction 61, which is driven by an electric motor 63, is fixed to one end of a suitable support structure that is rigdly connected, at the other end, near the mid point of the axle 19. The gear reduction 61 is provided with an output pinion 67 which engages the teeth of the arcuate rack 55. A single back-up roller 69 is mounted on a shaft 71 which is journaled in a pair of plates 70, 72 that are suitably fixed to the gear reduction 61. The single back-up roller 69 is not pivotable, but is so mounted in the side plates 7% 72 that it is in continuous rollable engagement with the back of the arcuate rack 55.
An operators cab and control station 73 is conveniently located centrally between the front wheels and in an elevated position above the main frame 13.
In order to describe the manner in which the control mechanism operates, reference is made to FIG. 2. In the operative position shown, the blade 21 is disposed so that the cutting edge 49 is in an earth-engaging position. The weight of the blade, rack and a portion of the support arms is upheld by the support structure 65 through the pinion 6'7 and the gear reduction 61. The single back-up roller 69 rollably engages the back surface of the rack and maintains the pinion 67 in positive engagement With the rack teeth.
Whenever it is desired to raise or lower the relative height of the blade and cutting edge, it is necessary for the operator only to actuate the motor-driven gear reduction 61. The pinion, thereupon, moves the rack in the desired direction relative to the gear reduction. The rack being formed to the arc of a circle, having its center on the pivot axis of the pivotable device, will be in continuous engagement with the output pinion. A feature of the present invention is that, with such an arcuate rack, only a single, fixed, non-pivotable back-up roller is required. This is in contrast to prior art systems which use a length of straight rack and, of necessity, a pair of pivotable back-up rollers. In the mechanism of the present invention, the single non-pivotable back-up roller is disposed in radial alignment with the output pinion and the pivotable device. The only purpose of the single roller is to react in line with the outward radial thrust of the pinion when moving the rack. Thus, the single back-up roller maintains the rack and pinion in continuous engagement.
While the drawing illustrates my invention as applied to a pivotable dozer blade of an earthworking machine, it is understood that my invention may be applied to many other types of pivotable devices, such as adjustable angularly disposable blade of a roadgrader, the apron of an earth carrying scraper bucket, and the like. It is evident, also, that my invention has wide applicability as n; a control mechanism for many other and various types of pivotable devices not necessarily related to earthworking machinery.
While I have shown my invention in only one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof.
I claim:
1. In an earthworking machine having a main frame and an earth engaging work tool structure pivotably mounted thereon for movement about an axis, a movement control mechanism for such earth engaging structure which comprises: a powered gear reduction mounted on said main frame above said earth engaging structure and having an output pinion; an arcuate length of rack connected at one end to said earth engaging structure and engaging said output pinion; and a single back-up roller journally mounted in a fixed position adjacent said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
2. In an earthworking machine having a main frame and a work tool structure pivotably mounted thereon for movement about an axis, a movement control mechanism for such structure which comprises: a powered gear reduction mounted on said main frame above said structure and having an output pinion; an arcuate length of rack connected at one end to said structure and having teeth engaging said pinion, said rack being so formed that the pitch line of the teeth thereof is the arc of a circle having its center on said axis of rotation of said pivotable structure; and a single back-up roller journally mounted in a fixed position adjacent said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
3. A control mechanism for a pivotable work tool structure mounted for movement about an axis, which comprises: an arcuate length of rack connected at one end to said pivotable structure and having teeth so arranged that the pitch line thereof is the arc of a circle having its center on said axis; support means fixed relative to said rack teeth pitch line; a powered gear reduction fixedly mounted on said support means and having an output pinion engaging said rack; and a single back-up roller journally mounted in a fixed position relative to said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
4. In a machine having a main frame and a pivotable work tool structure mounted thereon for movement about an axis, a movement control mechanism for such pivotable structure which comprises: an arcuate length of rack connected at one end to said pivotable structure and having teeth so arranged that the pitch line thereof is the are of a circle having its center on said axis; support means mounted on said main frame and fixed relative to said rack teeth pitch line; a powered gear reduction fixedly mounted on said support means and having an output pinion engaging said rack; and a single back-up roller journally mounted in a fixed position relative to said pinion for rollable engagement with the back surface of said rack and disposed in radial alignment with said output pinion.
References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

1. IN AN EARTHWORKING MACHINE HAVING A MAIN FRAME AND AN EARTH ENGAGING WORK TOOL STRUCTURE PIVOTABLY MOUNTED THEREON FOR MOVEMENT ABOUT AN AXIS, A MOVEMENT CONTROL MECHANISM FOR SUCH EARTH ENGAGING STRUCTURE WHICH COMPRISES: A POWERED GEAR REDUCTION MOUNTED ON SAID MAIN FRAME ABOVE SAID EARTH ENGAGING STRUCTURE AND HAVING AN OUTPUT PINION; AN ARCUATE LENGTH OF RACK CONNECTED AT ONE END TO SAID EARTH ENGAGING STRUCTURE AND ENGAGING SAID OUTPUT PINION; AND A SINGLE BACK-UP ROLLER JOURNALLY MOUNTED IN A FIXED POSITION ADJACENT SAID PINION
US227877A 1962-10-02 1962-10-02 Control arrangements and mechanisms for pivotable devices Expired - Lifetime US3161072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US227877A US3161072A (en) 1962-10-02 1962-10-02 Control arrangements and mechanisms for pivotable devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227877A US3161072A (en) 1962-10-02 1962-10-02 Control arrangements and mechanisms for pivotable devices

Publications (1)

Publication Number Publication Date
US3161072A true US3161072A (en) 1964-12-15

Family

ID=22854827

Family Applications (1)

Application Number Title Priority Date Filing Date
US227877A Expired - Lifetime US3161072A (en) 1962-10-02 1962-10-02 Control arrangements and mechanisms for pivotable devices

Country Status (1)

Country Link
US (1) US3161072A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307279A (en) * 1964-06-12 1967-03-07 Robert G Letourneau Multi-purpose work vehicles
US3376611A (en) * 1966-05-17 1968-04-09 Warner Swasey Co Textile apparatus
US4011764A (en) * 1972-07-29 1977-03-15 Zahnradfabrik Friedrichshafen Ag Steering gear with varying transmission ratio
US4304057A (en) * 1980-06-27 1981-12-08 Douglas Dynamics Inc. Snow plow assembly including linear actuator
US5029547A (en) * 1988-10-20 1991-07-09 Novey Richard T Remote steering control for outboard powerheads
US5125174A (en) * 1991-04-15 1992-06-30 Douglas Dynamics, Inc. Removable snowflow with a pivotable lift stand
USRE35700E (en) * 1991-04-15 1997-12-30 Douglas Dynamics, L.L.C. Removable snowplow assembly with pivotable lift stand
US6178669B1 (en) 1999-02-03 2001-01-30 Blizzard Corporation Plow hitch assembly for vehicles
US6393737B2 (en) 1999-02-03 2002-05-28 Blizzard Corporation Plow support assembly
US20070180739A1 (en) * 2006-02-02 2007-08-09 Meyer Products, Inc. Method and apparatus for raising a snow plow

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568559A (en) * 1945-02-24 1951-09-18 George V Nolde Control mechanism for compasses and calipers
US3033524A (en) * 1959-12-10 1962-05-08 Tournean Robert G Le Tree felling machine
US3132900A (en) * 1963-01-08 1964-05-12 Tourneau Robert G Le Operating mechanism for dump vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568559A (en) * 1945-02-24 1951-09-18 George V Nolde Control mechanism for compasses and calipers
US3033524A (en) * 1959-12-10 1962-05-08 Tournean Robert G Le Tree felling machine
US3132900A (en) * 1963-01-08 1964-05-12 Tourneau Robert G Le Operating mechanism for dump vehicle

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307279A (en) * 1964-06-12 1967-03-07 Robert G Letourneau Multi-purpose work vehicles
US3376611A (en) * 1966-05-17 1968-04-09 Warner Swasey Co Textile apparatus
US4011764A (en) * 1972-07-29 1977-03-15 Zahnradfabrik Friedrichshafen Ag Steering gear with varying transmission ratio
US4304057A (en) * 1980-06-27 1981-12-08 Douglas Dynamics Inc. Snow plow assembly including linear actuator
US5029547A (en) * 1988-10-20 1991-07-09 Novey Richard T Remote steering control for outboard powerheads
US5125174A (en) * 1991-04-15 1992-06-30 Douglas Dynamics, Inc. Removable snowflow with a pivotable lift stand
USRE35700E (en) * 1991-04-15 1997-12-30 Douglas Dynamics, L.L.C. Removable snowplow assembly with pivotable lift stand
US6178669B1 (en) 1999-02-03 2001-01-30 Blizzard Corporation Plow hitch assembly for vehicles
US6276076B1 (en) 1999-02-03 2001-08-21 Blizzard Corporation Plow hitch assembly for vehicles
US6393737B2 (en) 1999-02-03 2002-05-28 Blizzard Corporation Plow support assembly
US6615513B2 (en) 1999-02-03 2003-09-09 Blizzard Corporation Draw latch assembly for mounting a plow to a vehicle
US20070180739A1 (en) * 2006-02-02 2007-08-09 Meyer Products, Inc. Method and apparatus for raising a snow plow
US7661211B2 (en) 2006-02-02 2010-02-16 Louis Berkman Winter Products Company Method and apparatus for raising a snow plow

Similar Documents

Publication Publication Date Title
US3161072A (en) Control arrangements and mechanisms for pivotable devices
US3319739A (en) Self-propelled aerial platform
US4401408A (en) Articulated vehicle
US4274796A (en) Machine comprising a rotatable boom assembly
US3908289A (en) Swing-over snow wing
US3142197A (en) Control mechanism for pivotable device
US2130274A (en) Road working device
US2374016A (en) Scraper
US3328902A (en) Self-lifting surfacing machine for canals
US2222840A (en) Road machine
US2140105A (en) Road building and reclamation machine
US3746150A (en) Bulk material handling apparatus
US2713218A (en) Bulldozer and boom attachment therefor
US1806054A (en) Sweeping attachment for road graders
US1976597A (en) Tractor propelled implement
US2423167A (en) Scaffold
US2283012A (en) Bending apparatus
US2313412A (en) Reversible traction broom
US3235280A (en) Arrangement for tractors
JPS5834620B2 (en) Dojiyoui Doukikai
US2910790A (en) All wheel drive scraper-bulldozer
US1676548A (en) Road-finishing machine
US1784284A (en) Scraper-control mechanism
US3107444A (en) Grave digging machine
CA1147953A (en) Swing over snow wing