WO1997005363A1 - Cutting tool holder retention system - Google Patents
Cutting tool holder retention system Download PDFInfo
- Publication number
- WO1997005363A1 WO1997005363A1 PCT/US1996/012069 US9612069W WO9705363A1 WO 1997005363 A1 WO1997005363 A1 WO 1997005363A1 US 9612069 W US9612069 W US 9612069W WO 9705363 A1 WO9705363 A1 WO 9705363A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tool holder
- pin
- cutting tool
- bore
- holder
- Prior art date
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 274
- 230000014759 maintenance of location Effects 0.000 title claims abstract description 65
- 238000009412 basement excavation Methods 0.000 claims abstract description 59
- 230000013011 mating Effects 0.000 claims description 22
- 230000001154 acute effect Effects 0.000 claims 2
- 239000011295 pitch Substances 0.000 description 17
- 230000008901 benefit Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910001104 4140 steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/19—Means for fixing picks or holders
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/19—Means for fixing picks or holders
- E21C35/191—Means for fixing picks or holders for fixing holders
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/19—Means for fixing picks or holders
- E21C35/193—Means for fixing picks or holders using bolts as main fixing elements
- E21C35/1933—Means for fixing picks or holders using bolts as main fixing elements the picks having a cylindrical shank
Definitions
- This invention relates to excavation cutting tools, and more particularly to a retention system for retaining an excavation cutting tool holder in a support block during use.
- 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 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.
- a suitable power means When a number of such support blocks carrying 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.
- a cutting tool holder sometimes referred to as a cutting tool sleeve, bit holder, or bit sleeve
- the cutting tool is rotatably or otherwise releasably mounted within the bit holder which in turn is mounted within the support block via some mechanical connection. This helps to protect the support block from abuse and wear, thus minimizing or eliminating the down time periods otherwise required for drum repair.
- the use of such bit holders is well known in the art. For example, U.S. Patent No. 5,067,775 to D'Angelo discloses the use of such a bit holder which i ⁇ referred to as a sleeve in that patent.
- the cutting tool holder be mounted to the support block in such a manner as to minimize movement of the cutting bit holder in order to maximize the life of the cutting tool. It is also important that the mounting between the cutting tool holder and the support block be resistant to vibratory loosening which could likewise lead to premature cutting tool wear and failure.
- Various methods have been proposed or used in the past to mount a cutting tool sleeve within a support block in an attempt to minimize cutting tool holder movement or loosening, while maximizing cutting tool life.
- U.S. Patent No. 3,749,449 to Krekeler discloses a support block having two upstanding members or bifurcations which define therebetween a channel into which fits a tool holder.
- a pin passes through the support block and the cutting tool holder and releasably secures the tool holder to the support block.
- the Krekeler patent relies on cooperation between the bottom surface of the cutting tool holder and an upper surface of the support block, at the bottom of the channel, to resist forces tending to pivot the cutting tool holder about the pin.
- the Krekeler patent relies upon a close tolerance fit to minimize rotational movement of the cutting tool and cutting tool holder about the pin during use. Otherwise, movement of the cutting tool holder in the support block will cause unnecessary wear to the cutting tool, the cutting tool holder, and the support block.
- U.S. Patent No. 4,650,254 to Wechner discloses the use of two bolts to connect a cutting tool holder to a block.
- the two bolts pass horizontally through the rear surface of the support block and through the shank portion of the cutting tool holder. Such a connection may be subject to vibratory loosening.
- An object of the present invention is to provide an improved excavation cutting tool holder retention system which allows a cutting tool holder to be securely fastened to a support block in such a manner as to minimize or eliminate any movement or loosening of the cutting holder within the support block.
- an improved excavation cutting tool holder retention system comprises a cutting tool holder having a holder engagement surface and a support block having a tool holder bore into which the cutting tool holder is inserted.
- a pin having a pin engagement surface is movably mounted to the support block such that the pin engagement surface may be moved to engage the holder engagement surface.
- At least one of the holder and pin engagement surfaces defines an inclined surface such that when the pin engagement surface is moved to engage the holder engagement surface the shank portion of the cutting tool holder will be drawn into the tool holder bore.
- the excavation cutting tool holder retention system comprises a cutting tool holder having a holder engagement surface and a support block having a tool holder bore into which the cutting tool is inserted and a block pin bore intersecting the tool holder bore.
- the block pin bore defines a block engagement surface which is inclined downwardly relative to the tool holder bore. A pin engages the block engagement surface and the holder engagement surface such that the pin may be moved to draw the cutting tool holder into the tool holder bore.
- the support block has block pin bores which define the block engagement surface and are inclined downwardly.
- the holder engagement surface of the cutting tool holder is a transverse pin bore.
- the pin runs through and engages the transverse pin bore of the cutting tool holder.
- the pin has a pin shaft, a first jam member, and a second jam member, the first and second jam members each having a block engagement portion which movably engages the block pin bores. At least one of the first and second jam members is movable along the pin shaft relative to the other of the first and second jam members such that the block engagement portion of the first and second jam members is moved along the block pin bores and the cutting tool holder is drawn into the tool holder bore.
- the pin shaft has a threaded portion and one of the first and second jam members has a threaded jam bore such that one of the first and second jam members may threadably engage the pin shaft and be moved relative to the other of the first and second jam members.
- the first jam member may have a first aligned cylindrical portion and a first angled cylindrical portion and the second jam member may have a second aligned cylindrical portion and a second angled cylindrical portion such that the first and second aligned cylindrical portions engage the transverse pin bore of the cutting tool holder and the first and second angled cylindrical portions define the block engagement portion and engage the block pin bores.
- the cutting tool holder has a holder slot intersecting the transverse pin bore such that the cutting tool holder may be removed from the tool holder bore of the support block by moving the second jam member relative to the first jam member such that the first and second jam members do not interfere with the transverse pin bore and the cutting tool holder may be withdrawn from the tool holder bore while the first and second jam members still movably engage the block pin bores.
- At least one of the cutting tool holder and tool holder bore is tapered such that the cutting tool holder will be drawn and wedged into the tool holder bore of the support block when the pin engagement surface i ⁇ moved to engage the holder engagement surface.
- the tool holder has a holder ⁇ houlder and the support block has a ⁇ eating shoulder region adjacent the tool holder bore.
- the pre ⁇ ent invention also includes an improved cutting tool holder for use with a ⁇ upport block having a cutting tool holder bore into which the cutting tool holder is inserted and a pin having a pin engagement surface, the pin being movably mounted to the support block.
- the improved cutting tool holder comprises an outer wear region and a shank portion.
- the shank portion has a holder engagement ⁇ urface which engages the pin engagement surface.
- At least one of the holder and pin engagement surface ⁇ define ⁇ an inclined surface such that when the pin engagement surface is moved to engage the holder engagement surface the shank portion will be drawn into the tool holder bore of the support block.
- an improved cutting tool holder for use with a support block and pin, the support block having a tool holder bore into which the cutting tool holder is inserted and block pin bores inclined downwardly, the pin having a pin shaft, a fir ⁇ t jam member, and a ⁇ econd jam member movable along the pin shaft relative to the first jam member, the first and ⁇ econd jam member ⁇ movably engaging the block pin bore ⁇ .
- the improved cutting tool holder of this embodiment comprises an outer wear region and a shank portion.
- the shank portion has a tran ⁇ verse pin bore which is substantially aligned with the block pin bores when the shank portion is inserted into the tool holder bore such that the pin can run between the block pin bores through the transver ⁇ e pin bore.
- the first and second jam members engage the block pin bores and the transverse pin bore such that moving the second jam member relative to the first jam member will draw the shank portion into the tool holder bore of the support block.
- the shank portion has a holder slot such that the shank portion may be removed from the tool holder bore of the ⁇ upport block by moving the ⁇ econd jam member relative to the first jam member ⁇ uch that the fir ⁇ t and ⁇ econd jam member ⁇ no longer interfere with the transverse pin bore.
- the block pin bores and the jam members are configured such that the jam members will not rotate within the block pin bores.
- This feature provides alignment and orientation properties to properly and easily a ⁇ emble the pin in the support block.
- This mating feature may consist of a pin and groove arrangement.
- the present invention also includes a pin for use with a support block and a cutting tool holder, the tool holder having a transver ⁇ e pin bore, the support block having a tool holder bore into which the cutting tool holder is inserted and block pin bores inclined downwardly to and intersecting the tran ⁇ verse pin bore, the pin comprising a pin shaft having a first pitch threaded portion and a second pitch threaded portion, a first jam member having a fir ⁇ t aligned cylindrical portion, a fir ⁇ t angled cylindrical portion, and a first threaded jam bore, and a ⁇ econd jam member having a ⁇ econd aligned cylindrical portion, a ⁇ econd angled cylindrical portion, and a ⁇ econd threaded jam bore, the first jam member being threaded onto the first pitch threaded portion of the pin shaft and the second jam member being threaded onto the second pitch threaded portion of the pin shaft such that the fir ⁇ t and ⁇ econd aligned cylindrical portions may engage
- the cutting tool holder will be drawn into an especially tight relationship with the tool holder bore.
- This tight fit is especially secure if one or both of the shank portion or tool holder bore is tapered so that the shank portion of the cutting tool is wedged into the tool holder bore when the component ⁇ are engaged by utilizing the pin.
- the ⁇ ecurity of the fit is also increased if the tool holder has a holder shoulder which abuts a seating shoulder region of the ⁇ upport block when the cutting tool holder is drawn into the tool holder bore.
- thi ⁇ pre ⁇ ent invention Another advantage of thi ⁇ pre ⁇ ent invention is that the tool holder bore of the support block may have a configuration so as to completely surround and provide multi-directional support to the cutting tool holder. As a further advantage, when the tool holder is worn, it is easily removed and changed by simply loosening the pin. Further objects and advantages of this invention will be apparent from the following description, reference being had to the accompanying drawing ⁇ wherein preferred embodiment ⁇ of the present invention are clearly shown.
- FIGURE 1 is a side view of a support block, cutting tool sleeve, and cutting tool showing one embodiment of the invention
- FIGURE 2 is a ⁇ ectional view taken along the plane indicated by line 2-2 in FIGURE 1, the left half ⁇ howing the invention in the loose condition and the right half showing the tightened condition;
- FIGURE 3 i ⁇ a sectional view showing an alternative pin
- FIGURE 4 i ⁇ a ⁇ ide view of a support block, cutting tool sleeve, and cutting tool showing an alternative embodiment of the invention
- FIGURE 5 is a ⁇ ectional view taken along the plane indicated by line 5-5 in Figure 4;
- FIGURE 7 i ⁇ a side view of a support block, cutting tool holder, and cutting tool showing another alternative embodiment of the invention
- FIGURE 8 is a ⁇ ectional view taken along the plane indicated by line 8-8 in Figure 7, the left half showing the invention in the loose condition and the right half showing the tightened condition;
- FIGURE 9 is a side view of the shank portion of the cutting tool holder;
- FIGURE 10 is a side view of a threaded pin;
- FIGURE 11 i ⁇ a ⁇ ide view of a first jam member
- FIGURE 12 is a side view of a second jam member.
- the cutting tool retention system 10 include ⁇ a support block 12 and a cutting tool holder 14 mated to the support block 12 via pins 16.
- a cutting tool 18 may be rotatably and relea ⁇ ably mounted within the cutting tool holder 14.
- the scope of this invention would cover cutting tool holder retention system ⁇ in which the cutting tool is non-rotatably mounted.
- such support blocks 12 can be distributed over and fa ⁇ tened to, ⁇ uch a ⁇ by welding, the circumference and length of a drum or other body (not shown) according to any desired pattern.
- the drum or other body may be driven by any conventional and ⁇ uitable power mean ⁇ to cause the cutting tools 18 to engage and break up material that they are applied to.
- Such applications are well known in the art, and will not be described further here.
- the cutting tool 18 typically has an elongated body.
- the cutting end 22 of the cutting tool 18 typically comprise ⁇ a hard cutting in ⁇ ert 24 mounted onto a generally conical outer region 26.
- This hard cutting insert 24 may be made from cemented tungsten carbide or any other suitable material.
- the hard cutting insert 24 is generally mounted at the end of the conical outer region 26 where the cutting insert 24 may be brazed or otherwise suitably fastened into place.
- the cutting tool 18 also includes a tool shank 28 adjoining a shoulder 30 of the conical outer region 26. Because such cutting tools are generally known in the art, they need not be described in further detail here.
- Cutting tool holder ⁇ may have a variety of configurations.
- the cutting tool holder 14 shown in this embodiment has an outer wear region 32 and a shank portion 34 joined at a holder shoulder 36.
- the cutting tool holder 14 defines a tool bore 38 in which the cutting tool 18 may be rotatably or otherwise mounted.
- Such rotatable or non-rotatable mountings are well known in the art, and will not be described in further detail here.
- shank portion 34 of the cutting tool holder 14 may have a variety of configurations, the shank portion 34 as shown is tapered.
- the shank portion 34 may be made of solid material, or as shown here, may have a cavity such as a vertical bore 44.
- the shank portion 34 also has a holder engagement reces ⁇ which in this embodiment comprise ⁇ tran ⁇ ver ⁇ e pin bore ⁇ 46 which are aligned along the axi ⁇ designated "A" and which intersect the center axis "B" of the shank portion 34.
- the transverse pin bores 46 are tapered.
- the holder engagement reces ⁇ ha ⁇ a holder engagement ⁇ urface 48 which in the embodiment ⁇ hown is the lower inclined surface of the tapered transverse pin bores 46.
- the support block 12 typically has a tool holder bore 54 surrounded by a seating shoulder region 56.
- the tool holder bore 54 in this preferred embodi ⁇ ment i ⁇ tapered ⁇ o as to match the taper of the shank portion 34 of the cutting tool holder 14. It has been found preferable that the maximum total included taper angle be approximately 16°.
- the support block 12 also has a side surface 58 and a base 60 which may be mounted to a drum or other body (not shown) by way of welding or any other suitable method.
- the tool holder bore 54, and accordingly the cutting tool holder 14 and the cutting tool 18, is typically pitched in the direction of travel of the cutting tool 18, designated as direction "C" in Figure 1.
- the support block 12 has block pin bores 62, which are transversely aligned along the axis designated "D" and which intersect the center axis "B" of the tool holder bore 54 in a perpendicular relationship.
- the block pin bores 62 have a block threaded portion 64 extending from the side surface 58 to the tool holder bore 54. At the end of the threaded portion, an annular groove 66 may optionally be provided in which an O-ring 68 may be housed.
- the pins 16 are movably mounted to the ⁇ upport block 12. In thi ⁇ embodiment of the invention, the pins 16 are movably mounted via a block engagement portion 70 which i ⁇ threaded.
- the threaded block engagement portion 70 of the pin 16 is designed to threadably engage the threaded portion 64 of the block pin bores 62 of the support block 12.
- the pins 16 also have a pin engagement surface 72 which in this embodiment is tapered ⁇ uch as to provide an inclined surface 74 to engage the holder engagement surface 48 of the holder engagement recess 46.
- the pins 16 also have a tightening end 76.
- the tightening end 76 preferably ha ⁇ a configuration, such a ⁇ a non-circular ⁇ hape, a protru ⁇ ion, or a receiving aperture, by which a tool may be used to tighten the pins 16 in the block pin bores 62 as will be set forth.
- the configuration comprise ⁇ a hexagonal receiving aperture 78 de ⁇ igned to receive an alien wrench.
- the pins 16 may be made of any suitable material, an alloy steel, such as SAE 4140 or SAE 4340, i ⁇ preferred.
- the axes of the transverse pin bores 46, and correspondingly the block pin bores 62 need not intersect the tool bore 38 in a perpendicular relationship. Instead, the transverse and block pin bores may be inclined at an angle to the tool bore 38, preferably downwardly from the block surface 58 to the center axis "E" of the tool holder 14 at an angle between 70° and 90°. Furthermore, if two or more pins are used, the axes of the tran ⁇ verse pin bores, and correspondingly the block pin bores, need not be transver ⁇ ely aligned, nor i ⁇ it required that they inter ⁇ ect.
- the pin ⁇ 16 are then in ⁇ erted into the support block pin bores 62.
- the transver ⁇ e pin bore ⁇ 46 and the block pin bore ⁇ 62 are ⁇ till roughly aligned a ⁇ illu ⁇ trated by the axe ⁇ "A" and "D" ⁇ hown on the left half of Figure 2.
- the pin ⁇ 16 are then moved such that the inclined surface 74 of the pin engagement ⁇ urface 72 will engage the holder engagement ⁇ urface 48 of the cutting tool . holder 14. This movement of the pins 16 is accomplished via the tightening er/- 76 of the pin 16 which is engaged, with a tool (not ⁇ hown) or other means, so as to threadably engage the threaded block engagement portion 74 of the pin 16 in the threaded portion 64 of
- Nylok manufactured by Nylok Fastener Corporation, or any other suitable material or adhesive, may be employed to help prevent the pin 16 from backing out of the block pin bore 62 during use.
- the holder shank 34 of the cutting tool holder 14 will be forcibly wedged downward in the direction marked "E" into a tight fitting relationship with the tool holder bore 54 of the support block 12 until the holder shoulder 36 abuts the seating shoulder region 56.
- the axis "A" of the transver ⁇ e pin bore ⁇ 46 and the axis "D" of the block pin bores 62 will be substantially coincident as shown on the right half of Figure 2.
- the holder engagement surface 48 and pin engagement surface 72 each have a maximum total included angle of approximately 16°.
- the resulting fit as shown on the right side of Figure 2, is e ⁇ pecially secure because the holder shank portion 34 and the tool holder bore 54 are matingly tapered.
- the pin 100 which in this embodiment comprise ⁇ a ⁇ crew or threaded bolt 102, a jam member 104, and a cone member 106.
- the jam member 104 has cone end 108, a cylindrical section 110, a tool end 112, and a threaded throughbore 114.
- the tool end 112 preferably has a configuration, such as a non ⁇ circular shape, a protrusion, or a receiving aperture, by which a tool may be used to retain the jam member 104 in a stationary position while the screw or threaded bolt 102 is being tightened.
- the tool end 112 has a hexagonal nut configuration designed to be engaged by a wrench.
- the cone member 106 has a cone end 116, a cylindrical end 118, and a smooth throughbore 120.
- the exterior surface of the cone ends 108 and 116 define pin engagement surfaces 122 and 124 respectively which, as a result of the taper of the cone ends 108 and 116, provide inclined ⁇ urface ⁇ to engage the holder engagement surfaces 48' of the pin bores 46'. It is preferred that the pin engagement surfaces 122 and 124, and the pin engagement surfaces 48', have a maximum total included angle of approximately 16°.
- the screw or threaded bolt 102 has a threaded shaft 126 and a head 128 preferably with a configuration, such as a non-circular ⁇ hape, a protrusion, or a receiving aperture, by which a tool may be used to tighten the screw or threaded bolt 102 in relation to the jam member 104.
- the configuration of the head 128 is hexagonal such as to be engaged by a suitable wrench.
- This alternative embodiment is al ⁇ o different from the embodiment di ⁇ clo ⁇ ed in Figures 1 and 2 in that the block 12 ' of this embodiment has a block pin bore 130 which is not threaded, but instead is smooth-walled so as to slidably receive the cylindrical section 110 of the jam member 104 and the cylindrical end 118 of the cone member 106.
- the jam member 104 is then threadably tightened onto the shaft 126 such that the pin engagement surfaces 122 and 124 will engage the holder engagement surface 48' of the cutting tool holder 14'. Because at lea ⁇ t one, in this ca ⁇ e both, of the holder engagement ⁇ urface ⁇ 48' and the pin engagement surfaces 122 and 124 defines an inclined surface, the shank portion 34' of the cutting tool holder 14' will be wedged downward in the direction marked "G" into a tight fitting relationship with the main bore 54 ' of the support block 12' until the holder shoulder 36' abuts the seating shoulder region 56' as ⁇ hown in Figure 3.
- FIG. 4 Another alternative embodiment of the cutting tool holder retention system 200 is shown in Figures 4, 5 and 6.
- This cutting tool retention 200 includes a ⁇ upport block 202 having a main bore 204, a cutting tool holder 206 having a holder ⁇ hank portion 208, and pins 210.
- a cutting tool 212 may be rotatably mounted within the cutting tool holder 206.
- the cutting tool holder 206 in this embodiment is generally symmetrical about the axi ⁇ "I" and includes an outer wear region 214 and a holder ⁇ houlder 216.
- the cutting tool holder 206 define ⁇ a tool bore 218 in which the cutting tool 212 may be rotatably and releasably mounted.
- the tool bore 218 defines an annular keeper groove 220.
- the cutting tool 212 shown in this embodiment has a tool shank 222 defining an annular shank groove 224 adapted for receiving a split keeper ring 226 having projections 228.
- the tool shank 222 is rotatably mounted within the tool bore 218 via the projections 228 of the split keeper ring 226 which fit within the annular keeper groove 220 of the tool bore 218.
- Such a mounting is described in U.S. Patent No. 3,519,309 to Engle et al. and i ⁇ generally known in the art.
- the cutting tool 212 could be rotatably mounted within the tool bore 218 via the mounting disclosed in a co-pending application entitled "Cutting Tool Retention System,” filed on August 2, 1995, having U.S.S.N. 08/510,160, and naming Ted Richard Massa as the inventor.
- the shank portion 208 of the cutting tool holder 206 of this embodiment comprises a generally cylindrical portion 230 and an upper tapered portion 232 adjacent the shoulder 216.
- the shank portion 208 also has a holder engagement rece ⁇ which in this embodiment compri ⁇ e ⁇ inclined holder pin bores 234, the axes of which intersect the center axis "I" of the shank portion 208.
- the holder engagement reces ⁇ has a holder engagement surface 236 which in the embodiment shown is the lower inclined surface defined by the tapered surface of the inclined holder pin bores 234.
- the support block 202 has a seating shoulder region 238.
- the support block 202 defines inclined block pin bores 240 having a center axis "H" which intersects the center axis "I" of the main bore 204 of the support block 202.
- the inclined block pin bores 240 in this embodiment are threaded.
- the axes "H" of the two block pin bores 240 intersect at an angle, in this example at 90° relative to each other.
- the axes of the two block pin bore ⁇ 240 could intersect at any given angle, and in actuality, need not intersect at all.
- the pins 210 have a ⁇ tructure identical to the pins 16 described with regard to the embodiments shown in Figures 1 and 2. Accordingly, the pins 210 have a pin engagement surface 242 which are tapered to provide an inclined surface to engage the holder engagement surface 236 of the holder engagement recess, i.e., the inclined holder pin bores 234 shown in this embodiment. Similar to the embodiments ⁇ hown in Figures 1 and 2, the pins 210 are inserted into the inclined block pin bores 240 after being roughly aligned with the inclined holder pin bores 234. At this point, there will preferably be a small gap between the holder shoulder 216 and the seating ⁇ houlder region 238 of the ⁇ upport block 202.
- the pins 210 are then threadably moved such that the pin engagement surface 242 will engage the holder engagement surface 236 of the cutting tool holder 206.
- it is preferred that the holder engagement surfaces 236 and the pin engagement surfaces 242 have a maximum total included angle of approximately 16°.
- the pins 208 be ⁇ et at an angle of approximately 70° to 90° relative to the axi ⁇ "I" of the main bore 204 of the ⁇ upport block 202. As shown in Figure 5, it is also preferred that the pins 208 be inclined downwardly from the surface of the support block 202 to the axis "I" of the tool holder 214. While the axes "H" of the pins 210 and the block pin bore ⁇ 240 preferably intersect at the center axis "I" of the main bore 204, many other arrangements are possible and included in the scope of this invention. Furthermore, while two pin ⁇ 210 are ⁇ hown as being used, one or more pins may be used.
- This cutting tool holder retention system 300 includes a ⁇ upport block 302 having a tool holder bore 304 and block pin bores 306, a cutting tool holder 308 having a holder shank portion 310, and a pin 312.
- a cutting tool 314 may be rotatably mounted within the cutting tool holder 308. While the geometrical configurations of the support block 302, cutting tool holder 308, and cutting tool 314 may vary in an infinite number of ways, this embodiment is identical to the embodiment shown in Figures 1 and 2 with the exception that the shank portion 310 of the cutting tool holder 308, the block pin bores 306 of the support block 302 and the pin 312 have been altered. Accordingly, only those components of the holder retention system 300 which have been altered will be de ⁇ cribed in further detail with regard to this embodiment.
- the cutting tool holder 308 typically has an outer wear region 315 joining the holder ⁇ hank portion 310 at a holder shoulder 316. While the holder shank portion 310 of the cutting tool holder 308 may have a variety of configurations, the holder shank portion 310 as shown in Figures 7, 8, and 9 i ⁇ tapered along a center axi ⁇ "I.”
- the holder ⁇ hank portion 310 may be made of a solid material, or as shown in Figure 8, may have a cavity such as a vertical bore 317.
- the shank portion 310 also has a holder engagement recess which in this embodiment comprise ⁇ a tran ⁇ ver ⁇ e pin bore 318.
- the tran ⁇ verse pin bore 318 in this embodiment is cylindrical and aligned along a center axis designated "J" and which preferably intersects the center axis "I" of the ⁇ hank portion 310.
- the holder engagement recess has a holder engagement surface 320 which in the embodiment shown, is the surface defined by the transverse pin bore 318, especially the lower ⁇ urface when locking the tool holder 308 and the upper ⁇ urface when relea ⁇ ing the tool holder 308.
- the pin bores 318 also define pin bore grooves 319 along the lower ⁇ urface of the pin bores 318.
- the pin bore grooves 319 in this embodiment are semi-cylindrical in shape.
- Mating pins 321 having a cylindrical configuration reside within the pin bore grooves 319.
- the mating pins 321 may be press fit into the pin bore grooves 319 in which case the pin bore grooves 319 will have a cros ⁇ section configuration ⁇ lightly greater than a half circle or may be held in po ⁇ ition u ⁇ ing any ⁇ uitable fastening method such as by tack welding or epoxy adhesive ⁇ .
- the mating pins 321 may be made of any suitable material, such as 52100 steel.
- the holder shank portion 310 also defines a holder slot 322 defined by two vertical slot sides 324 which intersect the transverse pin bore 318. Additionally, the holder shank 310 defines jam reces ⁇ e ⁇ 326 having vertical rece ⁇ wall ⁇ 327.
- the tool holder bore 304 of the ⁇ upport block 302 may be partially ⁇ urrounded but i ⁇ more typically fully ⁇ urrounded by a seating shoulder region 328.
- the tool holder bore 304 of this embodiment has a holder bore center axis »» ⁇ « " which coincides with the axis "I" of the shank portion 310 of the cutting tool holder 308 when the component ⁇ are a ⁇ embled as shown.
- the support block 302 has block pin bores 330, which are cylindrical and aligned along the block pin bore axes designated "K.
- the block pin bore axes "K” intersect the axis "J" of the transver ⁇ e pin bore 318 at an angle “L.”
- the block pin bore ⁇ 330 have a block engagement surface 332, which in the embodiment shown is the surface defined by the block pin bores 330, especially the upper surface when locking the tool holder 308 and the lower surface when releasing the tool holder 308.
- the block engagement surface 332, and in this embodiment the block pin bores 330 having axes "K,” are inclined downwardly relative to the tool holder bore 304.
- the pin ⁇ haft 340 in this embodiment has a first pitch threaded portion 346, an unthreaded portion 348, and a second pitch threaded portion 350. While not shown, the pin shaft need not have an unthreaded portion. Furthermore, while the first pitch threaded portion 346 is shown as being a left hand threaded portion and the second pitch threaded portion is shown as being a right hand threaded portion, that need not be the case. In ⁇ tead, the pin shaft, if threaded, could have threaded portions which are both left hand or right hand but which differ in thread pitch.
- the pin shaft 340 also has an engagement structure 352 which, in the embodiment shown, constitute ⁇ hexagonal recesses centered along the axis "J" of the pin shaft 340.
- the first jam member 342 has an aligned cylindrical portion 356 aligned along the axis "J," the outer end of which has a chamfer 358, preferably at an angle of 45° to the axis "J".
- Adjoining the aligned cylindrical portion 356 at a jam shoulder 360 is an angled cylindrical portion 362 having a center axis
- the fir ⁇ t jam member 342 al ⁇ o define ⁇ a threaded jam bore 364 which, in the embodiment shown, constitutes a left hand threaded bore manufactured to threadably engage the first pitch threaded portion 346 of the pin ⁇ haft 340.
- the fir ⁇ t jam member 342 also defines a mating groove 365 along the lower ⁇ urface of the angled cylindrical portion 362.
- the mating groove 365 has a ⁇ emi-cylindrical configuration de ⁇ igned to mate with the mating pin 321 as will be explained in further detail.
- the pin 312 has a pin engagement surface 366.
- the pin engagement surface 366 has a holder engagement portion 368 and a block engagement portion 370.
- the holder engagement portion 368 is the outer ⁇ urface, e ⁇ pecially the lower ⁇ urface when locking and upper ⁇ urface when relea ⁇ ing, of the aligned cylindrical portion 356.
- the block engagement portion 370 i ⁇ the outer ⁇ urface, e ⁇ pecially the upper ⁇ urface when locking and the lower surface when releasing, of the angled cylindrical portion 362.
- the second jam member 344 is a mirror image duplicate of the fir ⁇ t jam member 342.
- the second jam member 344 has an aligned cylindrical portion 356', a chamfer 358', a jam shoulder 360', an angled cylindrical portion 362', a threaded jam bore 364' which in the embodiment shown has a right hand thread manufactured to threadably engage the ⁇ econd pitch threaded portion 350 of the pin ⁇ haft 340, and a pin engagement ⁇ urface 366' including a holder engagement portion 368' and a block engagement portion 370'.
- the angled cylindrical portion 362' of the second jam member 344 has an axis "K" ⁇ et at an angle "L" to the center axi ⁇ "J" of the aligned cylindrical portion 356' .
- the threaded jam bore ⁇ of the first and second jam members 342 and 344 need only have pitches which differ.
- the first or second jam member, 342 or 344 is partially threaded onto the first or ⁇ econd pitch threaded portion re ⁇ pectively, 346 or 350, of the pin shaft 340.
- the pin shaft 340, together with the one fir ⁇ t or ⁇ econd jam member 342 or 344, is then inserted through the block pin bores 306 such that the mating groove 365 or 365' of the first or second jam member, 342 or 344, is aligned roughly with the mating pin 321 of one of the block pin bores 306.
- An appropriate tool may then be used to engage the engagement structure 352 of the pin shaft 340 and rotate the pin shaft 340 appropriately such that the first and second jam member ⁇ , 342 and 344, will be drawn towards each other.
- the first and ⁇ econd jam members 342 and 344 must be maintained in position until the mating grooves 365 and 365' engage the mating pin ⁇ 321.
- the pin shaft 340 may be rotated until the angled cylindrical portion 362 and 362' of the first and second jam members, 342 and 344, re ⁇ ide partially within the block pin bore ⁇ 306.
- the holder ⁇ hank portion 310 of the cutting tool holder 308 may then be inserted into the tool holder bore 304 of the support block 302 ⁇ uch that the pin shaft 340 will slide through the holder slot 322 into the transver ⁇ e pin bore 318 of the cutting tool holder ⁇ hank portion 310.
- the holder shank portion 310 of the cutting tool holder 308 will be loosely fitted within the tool holder bore 304 of the support block 302.
- An appropriate tool may then again be u ⁇ ed to engage the engagement ⁇ tructure 352 of the pin shaft 340 and rotate the pin shaft 340 appropriately ⁇ uch that the fir ⁇ t and ⁇ econd jam members, 342 and 344, will be drawn toward ⁇ each other.
- the aligned cylindrical portions 356 and 356' of the jam members, 342 and 344 will be forced into the transver ⁇ e pin bore 318 aided by the chamfer ⁇ 358 and 358' on the ends of the jam members.
- the holder engagement portions 368 and 368' of the pin engagement surface ⁇ 366 and 366' of the jam members, 342 and 344 will engage the holder engagement surface 320 of the cutting tool holder shank portion 310 thereby forcibly wedging the cutting tool holder ⁇ hank portion 310 of the cutting tool holder 308 in the direction marked "N," a ⁇ ⁇ hown in Figure 8, into a tight fitting relation ⁇ hip with the tool holder bore 304 of the ⁇ upport block 302 until the holder shoulder 316 abuts the seating shoulder region 328 as shown on the right half of Figure 8. As shown on the right half of Figure 8, the jam shoulder 360 may then protrude into the jam recess 326 of the cutting tool holder shank portion 310.
- the cutting tool holder retention system 300 shown in Figures 7-12 should work satisfactorily when the transver ⁇ e pin bore 318 of the cutting tool holder ⁇ hank portion 310 ha ⁇ a diameter of 1.000" to 1.001", the holder ⁇ lot 322 ha ⁇ a dimen ⁇ ion of .627" to .630" between the vertical recess walls 324, the block pin bores 306 have a diameter of 1.124" to 1.125” set at an angle "L” between 5° ⁇ 10' and 8° ⁇ 10', the aligned cylindrical portion 356 of the jam members 342 and 344 has a diameter of 0.998" to 0.999", the angled cylindrical portion 362 of the jam members has a diameter of 1.122" to 1.123” and is set at an angle between 5° ⁇ 10' and 8° ⁇ 10' so as to match the angle of the block pin bores 306, and the threaded jam bore 364 constitutes a 37/64" through hole, tapped to 5/8" - 24 thread, right or left
- first and second pitch threaded portions 346 and 350 are 5/8" - 24 thread, left or right handed as required. All of the components may be made from any appropriate grade of steel, such as grade 4140 steel, 38-43 HRC.
- any other suitable material or adhe ⁇ ive may be employed to help prevent the pin ⁇ haft 340 from rotating during u ⁇ e and allowing the first and second jam members, 342 and 344, from loo ⁇ ening.
- the pin shaft 340 is ⁇ imply rotated in the opposite direction via the engagement structure 352 until the cutting tool holder shank portion 310 can be removed from the tool holder bore 304 and the pin shaft 340 via the holder slot 322.
- the first and second jam members, 342 and 344 need not be removed from the pin ⁇ haft 340, and the mating groove ⁇ 365 and 365' need not be disengaged from the mating pins 321, for the cutting tool holder 308 to be removed.
- the matching cylindrical ⁇ urfaces of the transverse pin bore 318 and the aligned cylindrical portions 356 and 356' of the jam members, 342 and 344, together with the matching cylindrical surfaces of the block pin bores 330, and the corre ⁇ ponding angled cylindrical portion ⁇ 362 and 362' of the jam members, will provide a better contacting relationship between the engagement ⁇ urface ⁇ , thereby lowering contact ⁇ tresses.
- the pin shaft 340 moves in the direction "M" as the cutting tool holder retention system 300 is tightened, a locking action is provided to restrain the system and help prevent undesired loosening.
- the pin translates forward in a direction reverse of "N,” providing a "bump off” motion to the cutting tool holder 308 for easier disengagement.
- the holder slot 322 in the cutting tool holder shank portion 310 allows the cutting tool holder 308 to be changed without the removal of any pins or screws from the ⁇ upport block 302.
- another advantage of this embodiment is that by not u ⁇ ing conical components, the need for special tooling is eliminated and manufacturing costs are reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Milling Processes (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE0842349T DE842349T1 (en) | 1995-08-02 | 1996-07-19 | FASTENING SYSTEM FOR CUTTING TOOL HOLDERS |
AU65930/96A AU708619B2 (en) | 1995-08-02 | 1996-07-19 | Cutting tool holder retention system |
DE69607006T DE69607006T2 (en) | 1995-08-02 | 1996-07-19 | FASTENING SYSTEM FOR CUTTING TOOL HOLDERS |
EP96925412A EP0842349B1 (en) | 1995-08-02 | 1996-07-19 | Cutting tool holder retention system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/510,451 | 1995-08-02 | ||
US08/510,451 US5607206A (en) | 1995-08-02 | 1995-08-02 | Cutting tool holder retention system |
US08/639,050 | 1996-04-24 | ||
US08/639,050 US5769505A (en) | 1995-08-02 | 1996-04-24 | Cutting tool holder retention system |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997005363A1 true WO1997005363A1 (en) | 1997-02-13 |
WO1997005363A9 WO1997005363A9 (en) | 1997-03-27 |
Family
ID=27056918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/012069 WO1997005363A1 (en) | 1995-08-02 | 1996-07-19 | Cutting tool holder retention system |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0842349B1 (en) |
CN (1) | CN1196771A (en) |
AU (1) | AU708619B2 (en) |
CA (1) | CA2228419A1 (en) |
DE (3) | DE962627T1 (en) |
PL (1) | PL324866A1 (en) |
WO (1) | WO1997005363A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998034011A1 (en) * | 1997-02-03 | 1998-08-06 | Kennametal Inc. | Cutting toolholder retention system |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20320163U1 (en) * | 2003-12-29 | 2004-03-04 | Dbt Gmbh | Chisel holder for a planer chisel |
US9028009B2 (en) | 2010-01-20 | 2015-05-12 | Element Six Gmbh | Pick tool and method for making same |
CN102822424B (en) * | 2010-03-18 | 2015-12-02 | 山东天工岩土工程设备有限公司 | For the pick of digger, wearing and tearing and installation system |
CN109025988A (en) * | 2018-08-28 | 2018-12-18 | 辽宁工程技术大学 | A kind of novel dismountable continuous miner roller |
DE102019008156A1 (en) * | 2019-06-28 | 2020-12-31 | Bomag Gmbh | Milling chisel for a floor milling machine, assembly unit with such a milling chisel and a clamping screw, chisel holder, chisel holder system, milling drum and floor milling machine as well as a method for assembling a milling chisel in a chisel holder |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2036327A (en) * | 1930-05-22 | 1936-04-07 | Jeffrey Mfg Co | Mining chain cutting bit |
US2722410A (en) * | 1953-03-12 | 1955-11-01 | Goodman Mfg Co | Mining cutter bit block |
US2996291A (en) * | 1957-05-16 | 1961-08-15 | Cincinnati Mine Machinery Co | Cutter bit and socket structures |
FR1470059A (en) * | 1966-02-25 | 1967-02-17 | Anderson Boyes & Co Ltd | Improvements to cutting peaks and corresponding tip holders |
DE2419831A1 (en) * | 1974-04-24 | 1975-11-20 | Wallram Hartmetall Gmbh | Attaching cutting tool to holder - using rubber insert tensioning pin to secure tool in position |
DE3411602A1 (en) * | 1982-11-13 | 1985-10-03 | Peters, Albert, 4000 Düsseldorf | Winning apparatus with rotary/tilting bit and sealed-off bit pocket |
US4609227A (en) * | 1982-11-13 | 1986-09-02 | Ruhrkohle Ag | Cutting-tool mounting for rotary excavating head |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH537770A (en) * | 1971-05-03 | 1973-06-15 | Kaiser Heinz | Boring tool |
US4083415A (en) * | 1975-12-18 | 1978-04-11 | Kennametal Inc. | Mining bit with replaceable work engaging member |
US4829862A (en) * | 1987-08-17 | 1989-05-16 | Carboloy Inc. | Modular locking system |
-
1996
- 1996-07-19 AU AU65930/96A patent/AU708619B2/en not_active Ceased
- 1996-07-19 DE DE0962627T patent/DE962627T1/en active Pending
- 1996-07-19 PL PL96324866A patent/PL324866A1/en unknown
- 1996-07-19 CN CN96197071A patent/CN1196771A/en active Pending
- 1996-07-19 EP EP96925412A patent/EP0842349B1/en not_active Expired - Lifetime
- 1996-07-19 WO PCT/US1996/012069 patent/WO1997005363A1/en active IP Right Grant
- 1996-07-19 CA CA002228419A patent/CA2228419A1/en not_active Abandoned
- 1996-07-19 DE DE0842349T patent/DE842349T1/en active Pending
- 1996-07-19 DE DE69607006T patent/DE69607006T2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2036327A (en) * | 1930-05-22 | 1936-04-07 | Jeffrey Mfg Co | Mining chain cutting bit |
US2722410A (en) * | 1953-03-12 | 1955-11-01 | Goodman Mfg Co | Mining cutter bit block |
US2996291A (en) * | 1957-05-16 | 1961-08-15 | Cincinnati Mine Machinery Co | Cutter bit and socket structures |
FR1470059A (en) * | 1966-02-25 | 1967-02-17 | Anderson Boyes & Co Ltd | Improvements to cutting peaks and corresponding tip holders |
DE2419831A1 (en) * | 1974-04-24 | 1975-11-20 | Wallram Hartmetall Gmbh | Attaching cutting tool to holder - using rubber insert tensioning pin to secure tool in position |
DE3411602A1 (en) * | 1982-11-13 | 1985-10-03 | Peters, Albert, 4000 Düsseldorf | Winning apparatus with rotary/tilting bit and sealed-off bit pocket |
US4609227A (en) * | 1982-11-13 | 1986-09-02 | Ruhrkohle Ag | Cutting-tool mounting for rotary excavating head |
Non-Patent Citations (1)
Title |
---|
"mining reporter", GLUCKAUF, vol. 125, no. 17,18, 21 September 1989 (1989-09-21), ESSEN,DE, pages 985, XP002018995 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998034011A1 (en) * | 1997-02-03 | 1998-08-06 | Kennametal Inc. | Cutting toolholder retention system |
Also Published As
Publication number | Publication date |
---|---|
EP0842349A1 (en) | 1998-05-20 |
DE69607006T2 (en) | 2000-09-28 |
EP0842349B1 (en) | 2000-03-08 |
AU708619B2 (en) | 1999-08-05 |
DE69607006D1 (en) | 2000-04-13 |
PL324866A1 (en) | 1998-06-22 |
CN1196771A (en) | 1998-10-21 |
DE842349T1 (en) | 1999-01-07 |
CA2228419A1 (en) | 1997-02-13 |
DE962627T1 (en) | 2000-06-08 |
AU6593096A (en) | 1997-02-26 |
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