EP0858375A1 - Hole saw - Google Patents

Hole saw

Info

Publication number
EP0858375A1
EP0858375A1 EP96937619A EP96937619A EP0858375A1 EP 0858375 A1 EP0858375 A1 EP 0858375A1 EP 96937619 A EP96937619 A EP 96937619A EP 96937619 A EP96937619 A EP 96937619A EP 0858375 A1 EP0858375 A1 EP 0858375A1
Authority
EP
European Patent Office
Prior art keywords
hole saw
drive
arbor
hole
pin carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96937619A
Other languages
German (de)
French (fr)
Inventor
Sture Alm
Per Holm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kapman AB
Original Assignee
Sandvik AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sandvik AB filed Critical Sandvik AB
Publication of EP0858375A1 publication Critical patent/EP0858375A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0473—Details about the connection between the driven shaft and the tubular cutting part; Arbors

Definitions

  • Hole saw devices are used with drill equipment to make round holes of larger diameter than can be made with spiral drills. They require only a limited amount of energy, since only a narrow region has to be turned into chips, and not all of the hole section.
  • Hole saw devices traditionally comprise an arbor with one or more threaded portions, a center drill attached to the arbor, an axially movable pin carrier which is axially movable but constrained to rotate with the arbor and provided with one or more drive pins, and a cup-shaped hole saw screwed onto a threaded portion of the arbor and forced to rotate with the arbor by the drive pins penetrating through drive apertures in a flat part of the hole saw.
  • the pin carrier is commonly constrained to rotate with the arbor by the drive pins extending through guide holes in a flange integral with the arbor, and locked axially by a retaining nut when the drive pins penetrate the drive apertures.
  • Splines or polygonal surfaces may also be used to constrain the carrier.
  • hole saw devices One feature of such hole saw devices is that apart from the rotation with the arbor, the hole saw proper is located axially and in tilting directions solely by the threads of the arbor, since if it were screwed tight against the termination of the threads, the holes of its flat part might not coincide with the drive pins and the guide holes.
  • the threads are prone to wear, and must anyway be rather loose-fitting to simplify changing of hole saws. Consequently, the hole saw will be rather movable relative to the center drill, except as to rotation.
  • the hole saw will vibrate severely, causing noise, uneven hole surface and rapid wear of the threads.
  • transmitting the axial force by the threads to the threaded center hole of the hole saw may cause overloading and deformation of the flat part of the hole saw and thus make the vibration even worse.
  • the invention concerns an improved hole saw device, where the carrier is provided with an annular support area farther from the arbor centerline than the locking pins. Axial forces will be transmitted to the hole saw through the annular support area instead of through the narrow threads, the threads only transmitting a small pretension load. The hole saw will then be accurately and stiffly located, with no possibility to rattle or vibrate, and the risk of deformation of the hole saw and premature wear of the threads is much reduced.
  • a further advantage is that the thread may be manufactured with a smoother termination to lower the risk of fatigue cracks.
  • Figure 1 shows a section through one embodiment of the invention, figure 2 a section through another.
  • the hole saw device comprises: an arbor (4) with an upper threaded part (18) and a lower threaded part (19) and an integral flange (10) with guide holes (1 1); a center drill (5); a hole saw with a toothed cylindrical part (8) and a flat part (7) with drive apertures (9) and an internally threaded center hole (6); an internally threaded nut (17); and a pin carrier (12) with drive pins (13).
  • the novelty according to the invention is that the pin carrier (12) is provided with a cylindrical skirt (14) extending deeper than the flange (10), but not deeper than the pins (13).
  • the skirt (14) may be made integral with the pin carrier (12) as shown in figure 1, or as shown in figure 2 made as a separate cup-shaped piece (14,16) enclosing the pin carrier and may then be free or attached to the nut (17) or the carrier (12).
  • the threaded nut (17) is screwed upwards to allow the pin carrier (12) with the drive pins (13) and the skirt (14) to be lifted clear of the apertures (9) in the flat part (7) of the hole saw.
  • the hole saw can then be rotated relative to the arbor until the threaded center hole (6) leaves the lower threaded arbor part (19) and the hole saw is freely removable.
  • the pin carrier can then be slid further down until the annular support area (15) at the lower edge of the skirt (14) touches the flat part (7) of the hole saw.
  • the nut (17) is then screwed down to apply pressure to the flat part (7) through the skirt (14).
  • the pressure between the internally threaded hole (6) and the lower threaded arbor part (19) is also increased, but since there is no motion in the thread, no wear occurs. Since any axial sawing feed force is transmitted through the skirt (14) with a larger diameter and not through the threads (19) with a smaller diameter, the flat part (7) will be much less stressed and deformed than if the feed force had to be transmitted through the loose-fitting threads (19).
  • the threaded center hole and the lower arbor thread may be reduced to a bayonet or twist-lock combination.
  • the annular support surface (15) may be made with one or more interruptions to avoid trapping of lubricant or other debris.
  • the center drill (5) may be exchanged for a smooth guiding peg if the larger diameter hole made by the cylindrical part (8) ofthe hole saw is to be centered around a previously made smaller hole.
  • the guiding peg may be fastened to the arbor in the same manner as the center drill (5), or screwed onto the lowest part ofthe arbor thread (19) below the hole saw. In the latter case, a hole saw ofthe same smaller diameter as the previously made hole may be used as a guiding peg.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

Hole saw device comprising an arbor, a cup-shaped hole saw with a center hole and one or more drive apertures, and an axially movable pin carrier constrained to rotate with the arbor provided with drive pins engaging the drive apertures, the pin carrier having a skirt surrounding the drive pins and able to transmit axial force to the hole saw.

Description

HOLE SAW
Background
Hole saw devices are used with drill equipment to make round holes of larger diameter than can be made with spiral drills. They require only a limited amount of energy, since only a narrow region has to be turned into chips, and not all of the hole section. Hole saw devices traditionally comprise an arbor with one or more threaded portions, a center drill attached to the arbor, an axially movable pin carrier which is axially movable but constrained to rotate with the arbor and provided with one or more drive pins, and a cup-shaped hole saw screwed onto a threaded portion of the arbor and forced to rotate with the arbor by the drive pins penetrating through drive apertures in a flat part of the hole saw. Such hole saw devices are described in the patents US 4,669,928, US 4,968,189 and others. The pin carrier is commonly constrained to rotate with the arbor by the drive pins extending through guide holes in a flange integral with the arbor, and locked axially by a retaining nut when the drive pins penetrate the drive apertures. Splines or polygonal surfaces may also be used to constrain the carrier.
One feature of such hole saw devices is that apart from the rotation with the arbor, the hole saw proper is located axially and in tilting directions solely by the threads of the arbor, since if it were screwed tight against the termination of the threads, the holes of its flat part might not coincide with the drive pins and the guide holes. The threads are prone to wear, and must anyway be rather loose-fitting to simplify changing of hole saws. Consequently, the hole saw will be rather movable relative to the center drill, except as to rotation. If the teeth of the saw are cutting unequally, such as when making a hole near the edge of a workpiece, or when sawing into a sloping or curved surface, the hole saw will vibrate severely, causing noise, uneven hole surface and rapid wear of the threads.
Likewise, transmitting the axial force by the threads to the threaded center hole of the hole saw may cause overloading and deformation of the flat part of the hole saw and thus make the vibration even worse.
Description ofthe invention
The invention concerns an improved hole saw device, where the carrier is provided with an annular support area farther from the arbor centerline than the locking pins. Axial forces will be transmitted to the hole saw through the annular support area instead of through the narrow threads, the threads only transmitting a small pretension load. The hole saw will then be accurately and stiffly located, with no possibility to rattle or vibrate, and the risk of deformation of the hole saw and premature wear of the threads is much reduced. A further advantage is that the thread may be manufactured with a smoother termination to lower the risk of fatigue cracks.
Description with reference to the drawings
Figure 1 shows a section through one embodiment of the invention, figure 2 a section through another.
The hole saw device comprises: an arbor (4) with an upper threaded part (18) and a lower threaded part (19) and an integral flange (10) with guide holes (1 1); a center drill (5); a hole saw with a toothed cylindrical part (8) and a flat part (7) with drive apertures (9) and an internally threaded center hole (6); an internally threaded nut (17); and a pin carrier (12) with drive pins (13). The novelty according to the invention is that the pin carrier (12) is provided with a cylindrical skirt (14) extending deeper than the flange (10), but not deeper than the pins (13). The skirt (14) may be made integral with the pin carrier (12) as shown in figure 1, or as shown in figure 2 made as a separate cup-shaped piece (14,16) enclosing the pin carrier and may then be free or attached to the nut (17) or the carrier (12).
When a hole saw (8) is to be removed from the arbor (4), the threaded nut (17) is screwed upwards to allow the pin carrier (12) with the drive pins (13) and the skirt (14) to be lifted clear of the apertures (9) in the flat part (7) of the hole saw. The hole saw can then be rotated relative to the arbor until the threaded center hole (6) leaves the lower threaded arbor part (19) and the hole saw is freely removable.
When a new hole saw is to be attached, it can be screwed onto the lower threaded part (19) of the arbor until it is at a close distance from the termination of the threads at the flange (10). The pin carrier (12) is then slid towards the hole saw with the locking pins (13) guided by the guide holes (1 1). The hole saw is turned until the apertures (9) in its flat part (7) coincide with the guide holes (1 1) and the pins can penetrate the apertures (9).
The pin carrier can then be slid further down until the annular support area (15) at the lower edge of the skirt (14) touches the flat part (7) of the hole saw. The nut (17) is then screwed down to apply pressure to the flat part (7) through the skirt (14). As the nut (17) is tightened, the pressure between the internally threaded hole (6) and the lower threaded arbor part (19) is also increased, but since there is no motion in the thread, no wear occurs. Since any axial sawing feed force is transmitted through the skirt (14) with a larger diameter and not through the threads (19) with a smaller diameter, the flat part (7) will be much less stressed and deformed than if the feed force had to be transmitted through the loose-fitting threads (19).
If the pin carrier is constrained to rotate with the arbor by other means than guide holes in a flange, the requirement that the skirt should reach below the flange does not apply. The threaded center hole and the lower arbor thread may be reduced to a bayonet or twist-lock combination. The annular support surface (15) may be made with one or more interruptions to avoid trapping of lubricant or other debris.
As is common practise, the center drill (5) may be exchanged for a smooth guiding peg if the larger diameter hole made by the cylindrical part (8) ofthe hole saw is to be centered around a previously made smaller hole. The guiding peg may be fastened to the arbor in the same manner as the center drill (5), or screwed onto the lowest part ofthe arbor thread (19) below the hole saw. In the latter case, a hole saw ofthe same smaller diameter as the previously made hole may be used as a guiding peg.

Claims

1. Hole saw device, comprising an arbor (4), a cup-shaped hole saw with flat upper part (7), the flat part having a center hole (6) and one or more drive apertures (9), and a pin carrier (10) constrained to rotate with the arbor (4) but axially movable to let one or more drive pins (13) engage the drive apertures (9), characterized by the pin carrier (10) provided with a skirt (14) surrounding the drive pins (13), the skirt having an annular contact surface (15) which is pressed against the flat part (7) of the hole saw when the drive pins (13) engage the drive apertures (9).
2. Hole saw device according to claim 1, where the skirt is integral with the pin carrier.
3. Hole saw device according to claim 1, where the skirt is a separate piece enclosing the pin carrier.
4. Pin carrier for use in a hole saw device, comprising one or more drive pins (13) for engaging drive apertures (9) in a hole saw, and a skirt (14) with an annular contact surface (15) surrounding the drive pins and able to apply axial force to the hole saw after the drive pins have penetrated the drive apertures (9).
EP96937619A 1995-10-27 1996-10-28 Hole saw Withdrawn EP0858375A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9503797A SE509754C2 (en) 1995-10-27 1995-10-27 Hole saw
SE9503797 1995-10-27
PCT/SE1996/001385 WO1997015413A1 (en) 1995-10-27 1996-10-28 Hole saw

Publications (1)

Publication Number Publication Date
EP0858375A1 true EP0858375A1 (en) 1998-08-19

Family

ID=20399995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96937619A Withdrawn EP0858375A1 (en) 1995-10-27 1996-10-28 Hole saw

Country Status (3)

Country Link
EP (1) EP0858375A1 (en)
SE (1) SE509754C2 (en)
WO (1) WO1997015413A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510841C2 (en) * 1996-12-19 1999-06-28 Sandvik Ab Hole saw
ES2223732T3 (en) 2000-09-01 2005-03-01 Credo Technology Corporation FAST CHANGE MANDREL ASSEMBLY FOR USE WITH A CUTTING EDGE HOLE DRILL AND A PILOT DRILL.
DE10256050A1 (en) 2002-11-30 2004-06-09 Hilti Ag Tool holder for core bits
US7073992B2 (en) * 2003-06-24 2006-07-11 Irwin Industrial Tool Company Arbor for hole cutter and related method of use
US8038372B2 (en) 2007-04-13 2011-10-18 Black & Decker Inc. Push button holesaw mandrel assembly
US8038371B2 (en) 2007-04-13 2011-10-18 Black & Decker Inc. Push button holesaw mandrel assembly
CN103111664B (en) * 2013-02-01 2015-08-19 成都三锐工具制造有限公司 Bimetal hole saw connects handle
KR101898989B1 (en) * 2018-04-03 2018-09-14 코리아에프에이(주) Long holesaw for composite insulated panel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3647310A (en) * 1970-04-03 1972-03-07 Mansfield K Morse Universal hole saw arbor
US3758221A (en) * 1971-12-29 1973-09-11 Black & Decker Mfg Co Hole saw assembly
US3837759A (en) * 1972-07-12 1974-09-24 Capewell Mfg Co Hole saw and quick disconnect drive therefor
US3784316A (en) * 1972-07-12 1974-01-08 Capewell Mfg Co Hole saw and reversible quick disconnect drive therefor
US4148593A (en) * 1978-01-27 1979-04-10 Stanadyne, Inc. Hole saw assembly
US4669928A (en) * 1986-10-07 1987-06-02 Eugenio Mediavilla Hole saw mandrel
GB2257381A (en) * 1991-07-09 1993-01-13 Eldon Tool Company Limited Arbor for hole saw.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9715413A1 *

Also Published As

Publication number Publication date
SE9503797L (en) 1997-04-28
SE9503797D0 (en) 1995-10-27
SE509754C2 (en) 1999-03-01
WO1997015413A1 (en) 1997-05-01

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