Method and apparatus for installing cutting edges on a V-blade plow

Abstract

For a V-plow having a pair of blades hinged together along inboard ends of the blades at a hinge, a gauge on a lower end of the hinge having a spacer, the spacer having a thickness in a direction generally transverse to a longitudinal axis of the V-plow corresponding to a desired minimum spacing between inboard ends of a pair of cutting edge plates to be installed on the blades, a method of installing the cutting edge plates on the blades is provided. The method comprises positioning one of the cutting edge plates along a lower edge of one of the blades so that the inboard end of the one cutting edge plate abuts one side of the spacer, securing the one cutting edge plate to the one blade, positioning the other cutting edge plate along a lower edge of the other blade so that the inboard end of the other cutting edge plate abuts the other side of the spacer, and securing the other cutting edge plate to the other blade.

Claims

1. For a V-plow having a pair of plow blades hinged together along inboard ends of the blades at a hinge having a generally vertical axis, a gauge adapted to be installed on a lower end of the hinge for spacing inboard ends of a pair of cutting edge plates to be installed on the blades, the gauge comprising: a generally horizontally oriented base plate having a hinge pin clearance hole and a pair of mounting holes for receiving bolts for removably attaching the gauge to the lower end of the hinge, one of the mounting holes being positioned on one side of the hinge pin clearance hole and the other mounting hole being positioned on the other side of the hinge pin clearance hole, and a spacer oriented generally perpendicularly to the base plate and having a thickness corresponding to a desired minimum spacing between the inboard ends of the pair of cutting edge plates, the spacer having a forward portion fixedly connected to an underneath side of the base plate, the spacer extending across the hinge pin clearance hole between the pair of mounting holes, and the spacer having a rearward portion fixedly connected to the underneath side of the base plate.

2. The gauge of claim 1 wherein the forward portion of the spacer angles or curves downwardly and rearwardly.

3. The gauge of claim 1 wherein the spacer is fin shaped in that the spacer is relatively thin in comparison to its length and height, is generally flat, and sweeps downwardly and rearwardly.

4. The gauge of claim 1 wherein the spacer has a transverse thickness of about 0.125 inch.

5. For a V-plow having a pair of plow blades hinged together along inboard ends of the blades at a hinge having a generally vertical axis, a gauge adapted to be installed on a lower end of the hinge for spacing inboard ends of a pair of cutting edge plates to be installed on the blades, the gauge comprising: a generally vertically oriented spacer having a thickness corresponding to a desired minimum spacing between the inboard ends of the pair of cutting edge plates, the spacer having a forward portion fixedly connected to a lowermost hinge lug of the hinge, the spacer having a rearward portion fixedly connected to the lowermost hinge lug of the hinge, the spacer extending across a hinge pin of the hinge, and the spacer having a recess between the forward portion and the rearward portion providing clearance for the hinge pin.

6. The gauge of claim 5 wherein the forward portion of the spacer angles or curves downwardly and rearwardly.

7. The gauge of claim 5 wherein the spacer is fin shaped in that the spacer is relatively thin in comparison to its length and height, is generally flat, and sweeps downwardly and rearwardly.

8. The gauge of claim 5 wherein the spacer has a transverse thickness of about 0.125 inch.

9. The gauge of claim 5 wherein the spacer is a generally flat plate lying in a plane defined by the vertical hinge axis and a longitudinal axis of the V-plow, is relatively thin in comparison to its length and height, and has a convex curved edge that sweeps downwardly and rearwardly from the forward portion to a point below the vertical hinge axis.

10. The gauge of claim 5 wherein the spacer is welded to the lowermost hinge lug of the hinge.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a right front perspective view of a V-plow according to the principles of the present invention.

(2) FIG. 2 is a front view of the V-plow of FIG. 1.

(3) FIG. 3 is an enlarged partial left front perspective view of the center cutting edge plates of the V-plow of FIGS. 1 and 2.

(4) FIG. 4 is a right front perspective view of the T-frame portion of the support frame assembly.

(5) FIG. 5 is an enlarged left front perspective view of the V-blade hinge assembly with moldboards removed from the V-blades.

(6) FIG. 6 is an enlarged rear bottom view of the V-blade hinge assembly of FIG. 5.

(7) FIG. 7 is an enlarged left rear bottom perspective view of the V-blade hinge assembly of FIG. 5.

(8) FIG. 8 is a left front top perspective view of a removable V-blade cutting edge plate installation gauge.

(9) FIG. 9 is a front bottom view of a permanent V-blade cutting edge plate installation gauge.

(10) FIG. 10 is a right front bottom perspective view of the permanent V-blade cutting edge plate installation gauge of FIG. 9.

(11) FIG. 11 is a left front bottom perspective view of the permanent V-blade cutting edge plate installation gauge of FIG. 9.

(12) FIG. 12 is a front view of the permanent V-blade cutting edge plate installation gauge and cutting edge plates with the V-blades in the forward sweeping scoop configuration.

(13) FIG. 13 is a left front bottom perspective view of the permanent V-blade cutting edge plate installation gauge and cutting edge plates with the V-blades in the straight blade configuration.

(14) FIG. 14 is a front view of the permanent V-blade cutting edge plate installation gauge and cutting edge plates with the V-blades in the rearward sweeping V configuration.

DETAILED DESCRIPTION OF THE DRAWINGS

(15) Referring first to FIGS. 1 and 2, a V-plow assembly 10 according to the principles of the present invention, and for removable attachment to a vehicle having a longitudinal axis A, is shown. Plow assembly 10 has a V-blade assembly 20, a support frame assembly 30, and a lift frame assembly 40. The V-blade assembly 20 is connected to the support frame assembly 30 on or near a front end of the support frame assembly 30 for pivotal movement relative to the vehicle about a generally vertical axis B as will be subsequently described in more detail. The support frame assembly 30 is pivotally connected to the lift frame assembly 40 on or near a rear end of the support frame assembly 30 for pivotal movement of the support frame assembly 30 relative to the vehicle about a generally horizontal axis C generally transverse to the vehicle longitudinal axis A. The lift frame assembly 40 includes a hydraulic actuator and associated structure for lifting and lowering the support frame assembly 30 and hence V-blade assembly 20. The lower rear end of the lift frame assembly 40 interfaces with a vehicle mount frame assembly (not shown) that is mounted to the frame of the vehicle thereby permitting the snow plow assembly 10 to be removably mounted to the vehicle. For additional details of a suitable support frame assembly 30, lift frame assembly 40, and vehicle mount frame assembly, reference may be had to the assignee's U.S. Pat. No. 6,944,978, hereby incorporated by reference herein as if fully set forth in its entirety.

(16) The V-blade assembly 20 comprises a pair of blades 50a, 50b hinged together along inboard ends thereof as at hinge assembly 52 for pivotal movement relative to one another and the vehicle about the generally vertical axis B of the hinge assembly 52. Each blade 50a, 50b is actuated by its own hydraulic actuator 51a, 51b, respectively (FIG. 6) operable between the respective blade 50a, 50b and the support frame assembly 30. Accordingly, the V-blade assembly 20 is able to assume a straight blade configuration, a rearward sweeping V-shaped configuration, and a forward sweeping V-shaped scoop configuration.

(17) Referring now to FIGS. 4-7, hinge assembly 52 is supported by or is otherwise formed as a part of a T-frame 70 which itself forms a part of the support frame assembly 30. For example, hinge assembly 52 can be formed by hinge lugs 72, 74, and 76 on the T-frame 70, hinge leaves 80, 82, 84, and 86 on left hand (driver side) blade 50a, hinge leaves 90, 92, 94, and 96 on right hand (passenger side) blade 50b, and hinge pin 100.

(18) Referring now back to FIGS. 1-3, left hand blade 50a includes a first outboard cutting edge plate 54a and a second inboard or center cutting edge plate 56a removably secured thereto, and similarly, right hand blade 50b includes a first outboard cutting edge plate 54b and a second inboard or center cutting edge plate 56b removably secured thereto. It is contemplated that the cutting edge plates can be either directly or indirectly attached to the blades and be within the scope of the present invention. In other words, all that is required is that the cutting edge plates be operably connected to the blades in some manner.

(19) For example, and as illustrated, cutting edge plates 54a, 56a can be indirectly attached to blade 50a by virtue of being removably secured to a “trip” cutting edge mounting structure 57a via bolts 58 and nuts 63, and cutting edge plates 54b, 56b can be indirectly attached to blade 50b by virtue of being removably secured to a “trip” cutting edge mounting structure 57b also via bolts 58 and nuts 63. The trip cutting edge mounting structures 57a, 57b can be, for example, angle sections. Angle sections 57a, 57b can in turn be pivotally attached to their respective blade 50a, 50b (or blade supporting frame) as by suitable bolts, pins, or the like (not shown) passing through holes in mounting lugs 59a, 59b on the angle sections 57a, 57b, respectively, and through holes in cooperating mounting lugs (not shown) on the blades 50a, 50b (or blade supporting frame).

(20) This arrangement permits the cutting edge plates to “trip,” i.e. pivot backward (typically against spring bias) about a generally horizontal axis D generally transverse to the vehicle longitudinal axis A, up and over, obstacles encountered during plowing. Such a configuration is typically referred to in the industry as an “edge trip.” This is in contrast to what is referred to in the industry as a “blade trip,” wherein the cutting edge plates are fixedly (i.e. non-pivotally) attached to the blade (or blade supporting frame) and the entire blade is pivotally mounted relative to the support frame assembly about a generally horizontal axis generally transverse to the vehicle longitudinal axis, which allows the entire blade to pivot backward against spring bias up and over obstacles encountered during plowing. In any event, the phrases “attached to the blade,” “secured to the blade,” “mounted to the blade,” “connected to the blade,” or similar language, when referring to the cutting edge plates, shall be deemed to generically embrace both direct mounting to the blade, as well as indirect mounting to the blade, such as mounting to the pivoting trip cutting edge mounting structure or mounting to the blade supporting frame or the like.

(21) As mentioned above, the first cutting edge plates 54a, 54b are mounted to their respective blades outboard of the second or center cutting edge plate 56a, 56b, respectively. Preferably the outboard cutting edge plates 54a, 54b include slots 55a, 55b, respectively, for the bolts 58 and the underlying mounting structure 57a, 57b includes holes for the bolts 58, whereas preferably the inboard or center cutting edge plates 56a, 56b include holes 61a, 61b, respectively, for the bolts 58 and the underlying mounting structure 57a, 57b includes slots for the bolts 58. Note, however, that the center cutting edge plates 56a, 56b could include slots and the mounting structure 57a, 57b could include holes, or the center cutting edge plates 56a, 56b could include a combination of holes and slots and the mounting structure 57a, 57b could include a combination of holes and slots. Nuts 63 are in turn threaded onto the bolts 58 to secure the cutting edge plates in place. Using two cutting edge plates for each blade allows the cutting edge plates to be made of two different materials, which can be advantageous from a cost and wear standpoint. For example, outer cutting edge plates 54a, 54b can be fabricated of harder AISI 1080-1084 and the inner (center) cutting edge plates 56a, 56b can be fabricated of softer ASTM A572 Grade 50. See the assignee's US Patent Application Publication No. 2009/0282706, hereby incorporated by reference herein as if fully set forth in its entirety, for a discussion of the advantages of using two separate cutting edge plates fabricated of materials having two different hardnesses, as well as a discussion of various other suitable materials. Notwithstanding, two separate cutting edge plates for each blade are not required for the practice of the invention. Accordingly, the term “cutting edge plate” shall be deemed to generically embrace both a cutting edge plate that extends the full length of the blade, as well as an inboard-most or center cutting edge plate that extends only partially the length of the blade. Additionally, the term “cutting edge plate” shall also be deemed to embrace only that portion that extends rearwardly from an inboard edge of the blade and inwardly toward the hinge axis of the V-blades.

(22) Referring to FIG. 3, the second cutting edge plate 56a mounted on blade 50a can have a first planar portion 60a and a second planar portion 62a, with the first planar portion 60a mounted to the front lower edge of blade 50a (or corresponding trip structure or blade frame), and with the second planar portion 62a extending rearwardly from the first planar portion 60a and inwardly toward the pivot axis B of the hinge assembly 52. Similarly, the second cutting edge plate 56b mounted on blade 50b can have a first planar portion 60b and a second planar portion 62b, with the first planar portion 60b mounted to the front lower edge of blade 50b (or corresponding trip structure or blade frame), and with the second planar portion 62b extending rearwardly from the first planar portion 60b and inwardly toward the pivot axis B of the hinge assembly 52. For suitable geometries, associated dimensions, and the like for the first and second planar portions of the cutting edge plates, again refer to the assignee's '706 patent publication.

(23) Referring now to FIGS. 6-14, a gauge 110 (FIG. 8) can be either removably attached (FIGS. 5-7) or permanently attached (FIGS. 9-14) to a lower end of the hinge assembly 52 to assist in installing the center cutting edge plates 56a, 56b to the blades 50a, 50b. More particularly, gauge 110 includes a spacer 112. The spacer 112 has a thickness in a direction generally transverse to the longitudinal axis A of the vehicle (and hence generally transverse to the longitudinal axis of the V-plow) corresponding to a desired minimum spacing between inboard ends of the inner or center cutting edge plates 56a, 56b. A suitable spacing has been found to be about ⅛ inch (about 0.125 inch). Spacer 112 could simply be welded to the underneath side of lowermost hinge lug 72 as at 114 and 116 shown in FIGS. 9-11 to effect permanent installation.

(24) Alternatively, spacer 112 could be temporarily or removably installed. More particularly, spacer 112 could be provided with a base plate 120 including a pair of clearance bolt holes 122, 122 which accept bolts 124 that extend through clearance holes in the lowermost hinge lug 72 and that are secured with nuts 125. Base plate 120 could further include a hinge pin clearance hole 126 so as to avoid any interference or binding with hinge pin 100. Preferably, a lowermost edge of the spacer 112 is spaced well above a lowermost edge of each cutting edge plate 56a, 56b so as to avoid obstructions that would be struck by the lowermost edges of the cutting edge plates 56a, 56b during plowing. The forward edge of the spacer 112 is preferably curved or sloped or slanted or angled downwardly and rearwardly to assist the spacer 112 in riding over an obstruction in the event that the obstruction is tall enough to be struck by the spacer 112 during plowing. For example, the spacer 112 can advantageously sweep downwardly and rearwardly so as to be roughly in the shape of a “fin.” Other shapes are of course suitable however. Examples of a suitable height and length (i.e. fore and aft dimension or dimension parallel to the vehicle longitudinal axis) of spacer 112 are about 1.5 inches high and about 3.0 inches long. Other dimensions both greater and lesser than those specified can be used for the height and length of spacer 112.

(25) In use, the gauge of the present invention can be utilized by an original equipment manufacturer (“OEM”), a distributor/dealer, or an end user to properly install cutting edge plates on a V-plow. With the gauge installed by being either temporarily or permanently attached to the hinge assembly, the blades are first typically, though not necessarily, positioned in their rearward sweeping V configuration, as this is the position that typically places the inboard ends of the cutting edges closest together. Due to variations in V-plow configurations, hinge geometry, etc., however, the blades may need to initially be placed in some other configuration, i.e. in straight blade configuration or in the forward sweeping scoop V configuration, or in some other position between rearward V, straight, and forward V, to place the blades in the position that will cause the inboard ends of the cutting edges to be closest together. The cutting edge plates are then initially attached to the blades with bolts and nuts, the nuts being merely hand tightened on the bolts. Then the cutting edge plates are simply slid inwardly until each contacts the spacer on the gauge. Next the nuts are fully tightened on the bolts with a tool such as a wrench or the like. Finally, if the gauge is of the removable variety, it is removed from the hinge assembly.

(26) Making the gauge spacer about 0.125 inch wide provides a good trade-off between avoiding interference between the inboard ends of the cutting edge plates, on the one hand, while preventing the gap between the inboard ends of the cutting edge plates from becoming excessive, on the other hand, during the full range of motion of the V-blades. Gauge spacer widths both greater than and lesser than 0.125 inch could be used and provide acceptable results, and are within the scope of the invention. Moreover, use of the gauge of the present invention allows a manufacturer to assure a near uniform fairly small gap between the inboard ends of the cutting edge plates during the full range of motion of the V-blades, while using standard manufacturing tolerances. Overly tight tolerances are thus not required. A manufacturer is thereby able to avoid the additional expense of fabricating the various parts to tighter tolerances, as well as the fitment headaches that are sure to arise when tolerances are tightened.

(27) The various embodiments of the invention shown and described are merely for illustrative purposes only, as the drawings and the description are not intended to restrict or limit in any way the scope of the claims. Those skilled in the art will appreciate various changes, modifications, and improvements which can be made to the invention without departing from the spirit or scope thereof. The invention in its broader aspects is therefore not limited to the specific details and representative apparatus and methods shown and described. Departures may therefore be made from such details without departing from the spirit or scope of the general inventive concept. Accordingly, the scope of the invention shall be limited only by the following claims and their equivalents.