Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Clamped tooth holder or tooth mount
Reexamination Certificate
1999-07-09
2001-04-24
Neuder, William (Department: 3672)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Clamped tooth holder or tooth mount
C299S103000
Reexamination Certificate
active
06220671
ABSTRACT:
TECHNICAL FIELD
This invention relates to excavation cutting tools, and more particularly a cutting tool holder retention system 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
.
As yet another example, U.S. Pat. No. 4,057,294 to Kreckler (referred to as the Kreckler patent) discloses a removable member
52
, into which the shank of a cutter bit
52
c
may be mounted, mounted within a dove-tailed slot
51
of a base member
50
via a wedge element
53
. The wedge element
53
is movably connected to the removable member
52
via a bolt
54
. To use the apparatus disclosed in
FIGS. 1-3
of the Kreckler patent, the removable member
52
is disposed in the dove-tailed slot
51
such that an inclined portion
52
a
of the removable member
52
is in contact with, and located under, an inclined portion
50
a
of the base member
50
. The wedge element
53
is then moved by tightening the bolt
54
such that the removable member
52
is held in place by the wedge element
53
and the inclined portion
50
a
within the dove-tailed slot
51
of the base member
50
.
SUMMARY OF THE INVENTION
An object of the invention is to provide an improved cutting tool holder retention system which allows a cutting tool holder to be assembled with a support block.
In carrying out the above object, and other objects and features of the present invention, an improved cutting tool holder retention system is provided. The improved cutting tool holder retention system comprises a support block and a tool holder. The support block has a tool holder bore and the tool holder has an effective shank, the effective shank being expandably adjustable within the tool holder bore so as to retain the effective shank within the tool holder bore. The effective shank may be retained within the tool holder bore by way of frictional engagement.
In a more specific embodiment, the effective shank is defined by a holder shank and a retainer portion, the retainer portion being adjustably connected to the holder shank such that the effective shank is expandable within the tool holder bore so as to retain the effective shank within the tool holder bore. In such case, the effective shank may be retained within the tool holder bore by way of frictional engagement.
In a preferred embodiment, the holder shank has a shank wedge surface and the retainer portion has a retainer wedge surface, the retainer portion being adjustably connected to the holder shank such that the retainer wedge surface engages the shank wedge surface so as to expand the effective shank. In such case, the tool holder bore may have a bore interior surface and the retainer portion may have a retainer engagement surface, the retainer engagement surface and holder shank defining an effective shank dimension which is expandable within the tool holder bore so as to retain the effective shank within the tool holder bore. Additionally, in such case the tool holder may have a holder bore, the holder bore intersecting at least a portion of the holder shank, and the retainer portion may have a retainer pin bore, at least one of the holder bore and retainer pin bore being threaded. Such embodiment would further include a pin having a pin threaded portion. The pin would run through the holder bore and retainer pin bore and the pin threaded portion would threadably engage the at least one of the holder bore and retainer pin bore so as to adjustably connect the retainer portion and holder shank such that by rotation of the pin the retainer portion is movable relative to the holder shank.
In an alternative embodiment, the excavation cutting tool holder retention system includes a support block, a tool holder, and a retainer. The support block has a tool holder bore. The tool holder has a holder shank, the holder shank having a shank axis and a shank wedge surface, the shank wedge surface being inclined relative to the shank axis. The retainer has a retainer wedge surface and a retainer engagement surface. The retainer is adjustably connected to the tool holder such that the retainer wedge surface slidingly engages the shank wedge surface and such that the retainer engagement surface and the holder shank cooperate to retain the holder shank within the tool holder bore. The retainer engagement surface and the holder shank may cooperate to retain the holder shank within the tool holder bore by way of frictional engagement with the tool holder bore.
In a preferred embodiment, the retainer is adjustably connected to the tool holder by way of a pin. In such case, the tool holder may have a tool holder bore, the holder bore intersecting at least a portion of the holder shank, and the retainer may have a retainer pin bore, at least one of the holder bore and the retainer pin bore being threaded. The pin may have a pin threaded portion which threadably engages the at least one of the holder bore and retainer pin bore such that by rotation of the pin the retainer is movable relative to the holder shank as the retainer wedge surface slidingly engages the shank wedge surface.
In yet another preferred embodiment, the pin has a pin diameter and the holder bore has a holder bore diameter, the holder bore diameter being greater than the pin diameter such that the pin may move laterally within the holder bore to allow the retainer to move relative to the holder shank.
In yet another preferred embodiment, the sha
Kennametal PC Inc.
Neuder William
Weldon Kevin P.
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