Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
2001-09-21
2003-09-16
Olms, Douglas (Department: 2661)
Metal working
Method of mechanical manufacture
Assembling or joining
C056S294000
Reexamination Certificate
active
06618925
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention generally pertains to turf care equipment, such as lawn mowers and the like. More particularly, the present invention relates to a bed knife blade for a reel-type lawn mower.
2. Discussion
Commercial turf care equipment often employ reel-type lawn mowers for mowing golf greens. These reel-type mowers typically include a frame having a rotatably mounted cutting reel and a bed knife blade positioned in close proximity to the cutting reel. As the cutting reel is rotated, the blades of grass projecting between the cutting reel and the bed knife blade are cut at a desired height. In order to repeatedly cut blades of grass in this manner, it is advantageous to maintain sharp edges on both the cutting reel blades and the bed knife blade for as long a duration as possible. Accordingly, most bed knife blades are constructed from materials such as heat treated high carbon steel in order to maintain a sharp edge over time.
Unfortunately, even though the bed knife is heat treated, the blade typically requires frequent sharpening and eventual replacement. Because the entire conventional bed knife blade is constructed from high carbon steel, manufacture and replacement of such a blade is expensive. Specifically, costly carbide cutting tools are required to rough machine a hot formed, high carbon steel blank. The blank is next heat treated and ground on two surfaces to produce a knife edge.
In addition to high manufacturing process costs, the current bed knife blade design is also costly to manufacture due to the type of raw material which must be used. Specifically, in order to resist impact and bending loads at the mounting location, material toughness is required. Furthermore, to provide a long lasting cutting edge, high hardness is beneficial. Currently, expensive steel alloys exhibiting both toughness and hardenability are selected for use in this application.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a bed knife blade assembly having an economically advantageous replaceable blade insert.
It is another object of the present invention to maintain the current ease of sharpening and/or replacement of the bed knife blade assembly.
The present invention pertains to a bed knife blade assembly for a reel mower having a frame rotatably supporting a cutting reel. The bed knife blade assembly comprises a clamp plate having a flange with a locking surface, and a blade insert having a tab cooperating with the locking surface to restrict movement of the blade insert relative to the clamp plate. The clamp plate is adapted to be coupled to the frame such that the flange biasingly engages the tab to further restrict movement of the blade insert relative to the clamp plate.
Additional benefits and advantages of the present invention will become apparent to those skilled in the art to which this invention relates from a reading of the subsequent description of the preferred embodiment and the appended claims, taken in conjunction with the accompanying drawings.
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Blount Steven
Harness & Dickey & Pierce P.L.C.
Olms Douglas
Textron Inc.
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