TR razr sharpening system
A device is disclosed for grinding reel type mower bedknives and blades of rotary type and reel type mowers. The device is capable of manually relief grinding reel blades on an intact mower, and in various stages of disassembly, to a bare reel stripped of its housing, with virtually any relief angle. The device can manually and semiautomatically spin grind a reel type mower reel while the reel is attached to the complete mower or if the reel and supporting structure are removed to a bench, with no further disassembly required. The device can manually grind the front face of a reel type mower bedknife while the bedknife remains attached to the reel housing and can grind the front and top face of a bedknife when it is removed. It can also grind rotary type blades and a variety of other straight edged tools.
The Present invention relates generally to machine tools, more specifically to methods and apparatus for sharpening reel blades, bedknife blades, and rotary blades on lawn and turf mowers.BACKGROUND OF THE INVENTION
Commercial mowers typically utilize both reel type and rotary type mowing units which must be maintained regularly to assure proper operation. Part of such maintenance involves sharpening the reels, bedknives, and rotary blades. This is a time consuming process. Prior art requires at least three separate machines to perform the needed operations. These machines are heavy, expensive, and bulky, requiring a sizable amount of shop space. One machine typically will spin grind and relief grind reels once the reel and supporting structure is removed from the mower and disassembled to some degree. One machine will grind the front and top face of a bedknife once the bedknife and supporting bedbar is removed from the reel housing. And still another machine will grind rotary blades.
There is a need in the art for a grinding machine that maintains or surpasses the quality and accuracy attained by current heavy, expensive stand alone machines that is capable of performing all the grinding needs of commercial lawn and turfgrass professionals housed in a single machine, that is lightweight and portable enough to attach directly to a reel type mower without removing the cutting unit from the complete mower if desired, providing a degree of flexibility far superior to any grinding machine prior to the present invention.BRIEF SUMMARY OF THE INVENTION
The present invention, in one embodiment, is a device for manually relief grinding a reel blade having a radially outer edge of an elongated length and first and second faces, with the first and second faces extending generally radially from the reel axis and the second face being the one that is relief ground. The device has the flexibility to perform the operation on an intact mower, on a cutting unit that has been removed from the mower in its' intact or partially disassembled state, or directly on a bare reel void of its' housing.
The present invention, in another embodiment, spin grinds the first face, described in the previous embodiment, of all the reel blades making up the reel cylinder simultaneously either manually or semiautomatically with the flexibility to perform the operation directly on an intact mower, or with the intact cutting unit removed from the mower.
In yet another embodiment, this invention manually grinds the front face of a bedknife of a reel type mower without the need to remove the bedknife and supporting bedbar from the cutting unit housing.
In another embodiment, this invention manually grinds the front and top face of a bedknife of a reel type mower when the bedknife and supporting bedbar is removed from the cutting unit housing.
In still another embodiment, this invention manually grinds rotary type mower blades utilizing a center pivot and blade stop allowing precise symmetrical grinding at apposing ends of the blade. This same embodiment is capable of grinding any straight blade (chisel, cutting bar, etc.) found in a maintenance shop.
While multiple embodiments are disclosed, still other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. As will be realized, the invention is capable of modifications in various obvious aspects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.
Referring to the drawings, wherein like reference numerals designate like or corresponding elements throughout the views, the assembly and modes of action will be thoroughly explained.Spin Grinding on the Intact Mower
With regard to spin grinding a reel of a reel type mower particular attention is directed toward
Once the carriage unit frame with affixed side-rail brackets 17,18 (
The previous attachment and adjustment procedure is essentially the same whenever a reel of a reel type mower is either spun or relief ground or the bedknife ground within its' housing.
Next the grinder bracket 37 (
As shown in FIG. 2., the grinder supporting (grinder and grinder bracket not shown) carriage unit is made up of a main unit 12 that traverses on two parallel rods 9 via linear bearings 28. The carriage unit bracket 29, that supports the grinder bracket, slides on a track inward, towards the surface to be ground, and outward, away from the surface to be ground, using a lead screw 30 controlled by an adjusting wheel 31 and locked in position using two knobs 26.
The carriage unit 12 holds the drive cup 32 that captures the bearing mounted post 71 (
If an independent reel backlapping feature is supplied with the particular mower being sharpened, the reel can be turned in the backwards rotation utilizing the mowers' own power and a separate power supply to spin the reel is not needed. If a mower backlapping feature does not exist, or the reel and supporting structures are removed from the mower for sharpening, an external power supply for spinning the reel is achieved using a commercially available reversible drill 48 (
Next the auto drive assembly as shown in
Spin grinding a reel within its' support housing that has been removed from the mower unit is essentially the same as when the cutting unit remains attached to the mower with the addition of a reel stand employed to hold the reel housing in a position that allows carriage unit frame attachment. Referring to FIGS. 6,9 the reel stand is assembled with the two base parts 1,2 connected via an extension 3 and stabilized with a rear strap 6, supporting the rear clamping brackets 7,8, forming a tripod. The extension 3 is adjusted and tightened in place when the distance between the reel roller supports 4 is equal to the distance between the rear roller support points 72 (
If a three point carriage unit attachment configuration is employed when using the base stand, the reel clamp components 106,107,108 (
Manually relief grinding the blades of a reel type mower involves initial setup and attachment of the carriage unit frame to the reel housing as described previously. It can be performed on the complete mower, when the cutting unit is, removed from the mower, or on a barren reel void of its' bearings. This procedure is most often performed after the reel has been spin ground returning it to a cylinder.
The autodrive assembly 64 (
The grinder bracket 37 (
To help manually align individual reel blades with the relief grind bracket during relief grinding the left bedknife bracket 87 (
Performing the relief grind procedure on a barren reel requires the use of an additional set of brackets 38 (
This procedure can be accomplished on the complete mower or when the cutting head has been removed from the mower. Initial attachment and adjustment of the carriage unit frame to the reel housing is the same as described earlier when spin grinding a reel on the intact mower. The only difference being changing the set angle of the grinder in both planes and attaching two brackets used to rotate the reel blades away from the grinder wheel as the length of the bedknife is ground.
Referring primarily to FIGS. 2,3,16,17 the grinder bracket 37 (
In order for the carriage unit to traverse the length of the bedknife, while grinding its' front face, without the grinder wheel making contact with the reel blades a means is described for rotating the said reel blades out of the way, providing grinder wheel clearance, as the grinding wheel traverses the length of the bedknife. This is accomplished by using a set of brackets releasably attached to either side of the carriage unit. The right bedknife bracket 60 and accompanying finger 58 is attached to the carriage unit clamp 27 (
The left bedknife bracket 87 (
Referring primarily to FIGS. 9-13,18,20 the two main portions of the base stand 1,2 are assembled with straps 5 attached and joined together with an adjustable extension 3 that allows the carriage unit frame, consisting of the carriage unit left 11 and right 10 side-rails, carriage unit rods 9, and main carriage unit 12, to be releasably attached and secured to the stand straps 5 using the lower straps' slot 96 and a knob 51.
The bedknife/rotary blade bedbar, consisting of a bedbar 13 (
The grinder bracket 37 (
Initially the bedbar left 15 and right 14 side-rails' witness marks are set to a carriage unit side-rail scale 42 mark. This scale setting in combination with a bedbar bracket 55,56 scale setting 99, and rotation of the bedknife support frame 93, while advancing the grinder wheel toward or away from the bedknife face with the carriage unit depth of grind adjustment wheel 31, will allow the operator to fix the position of the bedknife 57 front face such that the desired front face grind angle can be achieved when the grinder wheel contacts the bedknife during grinding.
To assure complete alignment accuracy, the caliper bracket 83 (
If more than one of the same style bedknife is to be sharpened, the right bedknife bracket 60 (
Grinding the top face 92 (
Once the bedknife position is fixed the caliper bracket 83 can be configured and releasably attached to the carriage unit 12 with a tightening knob 85 to allow the calipers' 86 post to make contact with the factory machined area posterior to the bedknife top face 92. The use of this caliper 86, in conjunction with the micro-adjust knob 23 (
Grinding rotary mower type blades 24 (
1. A single portable device for grinding a detached rotary type mower blade and the blades and bedknife of a reel type mower, with or without removal from the complete mower and with or without disassembling the reel or bedknife from its' housing, which is capable of both single blade (relief) grinding and spin grinding of said reel and front and top face grinding of said bedknife comprising:
- a. a carriage unit frame including two transverse rods and side-rails substantially parallel to one another.
- b. a carriage unit supported on said guide rods of said carriage unit frame adapted for translation along said guide rods.
- c. a grinder bracket supported on said carriage unit capable of supporting a commercially available angle grinder in a manner that allows grinding operations with the face or edge of the grinding wheel.
- d. a means for said grinder bracket of said carriage unit to be slidably adjusted, inward or outward, to control the depth of grind.
- e. a means by use of an adjustable set of carriage unit side-rail brackets releasably attached to said carriage unit side-rails that releasably attach the said carriage unit frame to the reel support structures in a position that, when traversing the said carriage unit across the said guide rods, the said carriage unit maintains a distance parallel to the longitudinal axis of the reel in two perpendicular planes.
- f. a means by use of accessory brackets attached to said carriage unit side-rail brackets that allow the said carriage unit frame to attach to a variety of reel mower housing styles in either a four point or three point attachment configuration.
- g. a means by use of an adjustable reel roller clamp to allow a three point carriage unit attachment configuration.
- h. a means by use of brackets attached to said carriage unit side-rail brackets, fixtured with centering bearings that allow the said carriage unit frame to be releasably attached directly to a barren reel in a position that allows relief grinding.
- i. a means by use of accessory brackets attached to the said carriage unit side-rail brackets that allow releasable attachment of a drill supporting bracket capable of positioning a commercially available variable speed reversible drill in a manner that it may be used as a source of power to spin a reel of a reel type mower during spin grinding.
- j. two releasable clamping means attached to said carriage unit used for attaching accessory brackets.
- k. an accessory bracket releasably attached to the first said clamping means of said carriage unit configured to support the back side of a reel blade effectively trapping the blade between said bracket and the grinder wheel during relief grinding.
- l. an accessory bracket releasably attached to second said clamping means of said carriage unit configured to be used as a visual aid when aligning individual blades of a reel during relief grinding.
- m. an accessory bracket releasably attached to the second said clamping means of said carriage unit supporting a set of calipers configured to a certain that the said carriage unit frame, when in use, is aligned parallel to the reel axis or surface being ground in two perpendicular planes.
- n. a set of accessory brackets releasably attached to the first and second said clamping means of said carriage unit configured so that, during the operation of grinding the front face of a bedknife within its' reel housing, the brackets make contact with the reel blades and rotate them away from the grinding wheel as it traverses the length of the bedknife during grinding.
- o. a means by use of a base stand to support and position a reel housing for said carriage unit side-rail bracket attachment when the reel and supporting housing are removed from the mower. This said base stand provides an adjustable means to support reels of variable widths and accessory brackets to provide one point of fixation during three point carriage unit attachment. It also provides a means by use of a pair of removable straps that allow releasable attachment of the said carriage unit frame, void of said carriage unit side-rail brackets, directly to the said base stand when employing the bedbar during rotary blade and bedknife grinding.
- p. a said bedbar, comprised of two parallel bedbar rails supporting a connecting bar or table, with a means that allows said bedbar rails to be releasably attached to said carriage unit frame releasably attached to said base stand, creating a work surface parallel in two perpendicular planes to the longitudinal travel of the said carriage unit when traversed on the said guide rods.
- q. a means by use of a set of bedbar brackets releasably attached to said bedbar that releasably attach to the ends of a bedknife that can be manipulated and fixed in a manner that aligns the said bedknife in multiple positions, parallel in two perpendicular planes to the said carriage unit, to facilitate front and top face bedknife grinding, when said carriage unit is traversed on said guide rods.
- r. a means by use of a sliding bedbar bracket that releasably attaches to a channel in the mid-portion of said bedbar supporting a post and clamping means to releasably attach a rotary type blade to said bedbar in a manner that aligns the rotary blades' edge parallel in two perpendicular planes to the said carriage unit when traversed on said guide rods and in a position where the attached grinder wheel of said carriage unit will produce the desired grind angle and taper.
- s. a means by use of a blade stop releasably attached to the said bedbar during rotary blade grinding that will allow the said rotary blade to be flipped precisely end for end achieving the same grind angle and taper at each end.
- t. a means for automatic translation of said carriage unit on said guide rods in both directions using a small electric motor, sprockets, and a looped chain bearing a post, supported on an adjustable bracket with a means for clamping said bracket to said carriage unit side-rails creating a union between said chain post and a post capturing cup fixed to said carriage unit.
Filed: Jan 26, 2009
Publication Date: Aug 13, 2009
Applicant: (Wisconsin Rapids, WI)
Inventor: Dean David Rasmussen (Wisconsin Rapids, WI)
Application Number: 12/321,745