Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable-type bit mount
Reexamination Certificate
1999-03-19
2001-12-18
Bagnell, David (Department: 3673)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable-type bit mount
C299S102000, C299S079100
Reexamination Certificate
active
06331035
ABSTRACT:
TECHNICAL FIELD
This invention relates to excavation cutting tools, and more particularly an 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, and the drum 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 a mining machine 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. 5,769,505 to Siddle and Massa discloses a cutting tool holder which may be connected within the support block bore via a pin threadably mounted to the support block. The portion of the pin extending into the support block bore has a generally conical shape and engages the cutting tool holder such that when the pin is rotated so as to move the pin into the block bore the conical shape will engage the cutting tool holder so as to draw the cutting tool holder into the support block bore.
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 assembly is provided. The improved excavation cutting tool holder assembly comprises a cutting tool holder having a holder body portion and a holder shank. The holder shank has a shank press fit portion and a shank bottom end. The shank press fit portion has a shank press fit dimension. The shank bottom end has a tool holder locator. The assembly also includes a support block having a block body. The block body has a block bore. The block bore has a block bore press fit portion and a block engagor. The block bore press fit portion has a block bore press fit dimension less than the shank press fit dimension such that the shank press fit portion press fits with the block bore press fit portion while the block engagor engages the tool holder locator so as to orient the cutting tool holder relative to the support block.
In a preferred embodiment, the holder body portion of the cutting tool holder has a holder shoulder, the holder shoulder having a holder shoulder face located adjacent the block body when the cutting tool holder is press fit within the block bore of the support block, the holder shoulder face defining an undercut recess.
In another preferred embodiment, the shank has a shank tapered portion and the block bore has block bore tapered portion such that when the shank tapered portion seats within the block bore tapered portion the shank press fit portion press fits with the block bore press fit portion.
In yet another preferred embodiment, the cutting tool holder may include a striking surface.
In an alternative embodiment, the excavation cutting tool holder assembly includes a cutting tool holder having a holder body portion and a shank. The holder shank has a shank tapered portion and a shank press fit portion. The shank press fit portion has a shank press fit dimension. The assembly also includes a support block having a block body. The block body has a block bore. The block bore has a block bore tapered portion and block bore press fit portion. The block bore press fit portion has a block press fit diameter less than the holder press fit diameter such that when the shank tapered portion seats within the block bore tapered portion the shank press fit portion press fits with the block bore press fit portion.
In a preferred embodiment, the holder shank has a shank bottom end having a locator groove and the block bore has a block pin such that the block pin will engage with and slide into the locator groove so as to orient the cutting tool holder relative to the support block.
In another preferred embodiment, the holder body portion of the cutting tool holder has a holder shoulder, the holder shoulder having a holder shoulder face located adjacent the block body when the cutting tool holder is press fit within the block bore of the support block, the holder shoulder face defining an undercut recess.
In another alternative embodiment, the excavation cutting tool holder assembly includes a cutting tool holder having a holder body portion and a holder shank. The holder shank has a shank tapered portion and a holder shoulder having a holder shoulder face. The holder shoulder face defines an undercut recess. The assembly also includes a support block having a block body. The block body has a block bore. The block bore has a block bore tapered portion such that the shank tapered portion seats within the block bore tapered portion and the holder shoulder face is correspondingly located adjacent the block body.
In each of these embodiments, the tool holder locator may have a female configuration and the block engagor may have a male configuration. More specifically, the block engagor may consist of a block pin within the block bore and the tool holder locator may consist of a locator groove in the shank bottom end such that the block pin will engage with and slide into the locator groove so as to orient the cutting tool holder relative to the support block. The block pin may consist of a cylindrical pin running across the entire width of the block bore and the locator groove may have groove side walls running across the entire width of the shank bottom end.
In each of these embodiments, the undercut recess may have a top recessed surface which is inclined relative to the holder shoulder face.
Furthermore, in each of these embodiments, the shank press fit portion may be a shank cylindrical portion having a shank press fit diameter and the bore press fit portion may be a bore cylindrical portion having a block bore press fit diameter less than the shank press fit diameter such that the shank cylindrical portion press fits with the bore cylindrical portion of the block bore.
In each of these embodiments, it is preferred that the shank tapered portion be located adjacent the holder body portion and the shank press fit portion be located adjacent the shank tapered portion.
In each of these embodiments, the holder shank may also include a shank slip fit portion to guide the holder shank into the block bore. In such case, it is preferred that the shank tapered portion be located adjacent the holder body portion, the shank press fit portion be located adjacent the shank tapered portion, and the shank slip fit portion be located adjacent the shank press fit portion.
In each of these embodiments having a block engagor and a tool holder locator, the block engagor may be a pin within the block bore and the tool holder locator may be a locator groove in the shank bottom end such that the block pin will engage the locator groove so as to orient the cutting tool holder relative to the support block such that the block pin will slide into the locator groove as the cutting tool holder is press fit with the support block.
Furthermore, in each of these embodiments, the cutting tool holder may include a striking surface.
The present invention also includes an improved cutting tool holder for use with a support block having a block body, the block body having a block bore, the block bore having a block bore tapered portion, a block bore press fit portion, and a block engagor, the block bore press fit portion having a block bore press fit diameter. The improved cutting tool holder c
Bagnell David
Kennametal PC Inc.
Kreck John
Weldon Kevin P.
LandOfFree
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