Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable-type bit mount
Reexamination Certificate
1999-04-07
2001-05-22
Lillis, Eileen D. (Department: 3673)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable-type bit mount
C299S102000
Reexamination Certificate
active
06234579
ABSTRACT:
TECHNICAL FIELD
This invention relates to excavation cutting tools, and more particularly a cutting tool holder assembly for retaining a cutting tool holder within a support block during use.
BACKGROUND ART
Excavation cutting tool assemblies for such applications as continuous mining or road milling typically comprise a cutting tool, sometimes referred to as a cutting bit, rotatably mounted within a cutting tool holder, sometimes referred to as a cutting tool sleeve, bit holder, or bit sleeve. In such assemblies, the cutting tool holder is mounted within a support block. The support block in turn is mounted onto a drum or other body, typically by welding, which in turn is driven by a suitable power means. When a number of such support blocks carrying cutting tool holders and cutting tools are mounted onto a drum or other body, and the drum or other body is driven, the cutting tools will engage and break up the material which is sought to be mined or removed. The general operation of such mining, road milling, or other such machines is well known in the art.
As mentioned, the cutting tool holder may be mounted within the support block, typically via some mechanical connection. For example, U.S. Pat. No. 5,322,351 to Lent (referred to as the Lent patent) discloses a cutting tool holder 42 mounted within a tool holder receiving pocket 28 of a support block, referred to in the Lent patent as a segment member 18, via a wedge member 46. The wedge member 46 is movably connected to the support block via an adjustable screw member 54. To use the apparatus disclosed in the Lent patent, a cutting tool holder 42 is disposed in the tool holder receiving pocket 28 such that the base portion of the tool holder mates with, and is located under, an inclined wall surface 24 within the receiving pocket 28. The wedge member 46 is then moved by tightening the adjustable screw member 54 such that the cutting tool holder 42 is held in place by the wedge member 46 and the inclined wall surface 24 of the receiving pocket 28 within the receiving pocket 28 of the support block.
As another example, U.S. Pat. No. 5,378,050 to Kammerer and Diessner (referred to as the Kammerer patent) discloses a chisel holder 30 having a neck 31 which may be inserted into a plug-in receptacle 21 of a support block, referred to as a basic part 20 in the Kammerer patent. The plug-in neck 31 has a recess 37 which defines a pressure surface 38. The pressure surface 38 faces a pressure screw 50 adjustably disposed in the support block, the basic part 20, so as to intersect the plug-in receptacle 21. The pressure screw 50 may be adjusted such that the pressure screw 50 protrudes into the recess 37 of the neck 31 of the chisel holder 30 and such that a retracting force is exerted on the pressure surface 38 of the chisel holder 30.
SUMMARY OF THE INVENTION
An object of the invention is to provide an improved cutting tool holder assembly which allows a cutting tool holder to be assembled within a support block.
In carrying out the above object, and other objects and features of the present invention, an improved excavation cutting tool holder retention assembly is provided. The improved excavation cutting tool holder retention assembly comprises a support block, cutting tool holder, and locking member. The support block has a tool holder bore, the tool holder bore having a bore interior surface. The cutting tool holder has a shank portion, the shank portion having a shank engagement surface. The locking member is forced between the bore interior surface and the shank engagement surface so as to frictionally retain the shank portion of the cutting tool holder within the tool holder bore.
In a preferred embodiment, the locking member has a wedge portion, the wedge portion having a bore adjacent surface and a shank adjacent surface, and at least one of the bore adjacent surface, shank adjacent surface, shank portion, and bore interior surface has a textured surface. In a more specific preferred embodiment, the textured surface is a serrated surface or a waved surface.
In another preferred embodiment, the locking member has a wedge portion, the wedge portion having a bore adjacent surface and a shank adjacent surface, and at least two of the bore adjacent surface, shank adjacent surface, shank portion, and bore interior surface which are in contact with each other has a textured surface. In a more preferred embodiment, the textured surfaces interlock. Such textured surfaces may be serrated surfaces or waved surfaces.
In yet another preferred embodiment, the shank engagement surface has a shank textured surface and the shank adjacent surface of the locking member has a locking member textured surface. In a more preferred embodiment, the shank textured surface and the locking member textured surface is a serrated surface or a waved surface. Such shank textured surface and locking member textured surface may also interlock.
In an additional preferred embodiment, the shank engagement surface is inclined such that when the shank portion is in the tool holder bore of the support block a wedge pocket is defined between the shank engagement surface and the bore interior surface such that the locking member may be forced into the wedge pocket so as to frictionally retain the shank portion of the cutting tool holder within the tool holder bore.
In an alternative embodiment, the excavation cutting tool holder retention assembly includes a support block, a cutting tool holder, and a locking member. The support block has tool holder bore, the tool holder bore having a bore interior surface. The cutting tool holder has a shank portion, the shank portion having a shank engagement surface and a shank end. The shank engagement surface is inclined such that when the shank portion is in the tool holder bore of the support block a wedge pocket is defined between the shank engagement surface and the bore interior surface. The locking member has a wedge portion, the wedge portion having a shank adjacent surface and a bore adjacent surface. At least one of the shank adjacent surface and shank engagement surface has a textured surface, the wedge portion of the locking member being forced into the wedge pocket such that the bore adjacent surface of the locking member engages the bore interior surface of the tool holder bore and such that the shank engagement surface engages the shank adjacent surface so as to frictionally retain the shank portion of the cutting tool holder within the tool holder bore.
In a preferred embodiment, the shank engagement surface has a shank textured surface and the shank adjacent surface has a locking member textured surface. The shank textured surface and the shank adjacent surface may both be a serrated surface or a waved surface. Such shank textured surface and locking member textured surface may also interlock.
In each of these embodiments, the shank portion of the cutting tool holder may have a compressible surface which is compressed against the bore interior surface when the wedge portion of the locking member is forced between the bore interior surface and the shank engagement surface. In a more specific embodiment, the tool holder bore may have a bore recess and at least a portion of the compressible surface of the shank portion of the cutting tool holder may protrude into the bore recess when the wedge portion of the locking member is forced between the bore interior surface and the shank engagement surface.
Furthermore, in each of these embodiments, the locking member may have an exposed portion and the exposed portion may have a striking surface which may be struck so as to force the wedge portion of the locking member between the bore interior surface and the shank engagement surface or into the wedge pocket. The locking member may also have a prying shoulder which may be used to pry the locking member from between the bore interior surface and the shank engagement surface.
In yet another alternative embodiment, the excavation cutting tool holder retention assembly includes a support block, a cutting tool holder, and
Kennametal PC Inc.
Lillis Eileen D.
Singh Sunil
Weldon Kevin P.
LandOfFree
Cutting tool holder retention assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cutting tool holder retention assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cutting tool holder retention assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2555930