EP0858375A1 - Hole saw - Google Patents
Hole sawInfo
- 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- Withdrawn
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)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9503797 | 1995-10-27 | ||
SE9503797A SE509754C2 (sv) | 1995-10-27 | 1995-10-27 | Hålsåg |
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 (sv) |
SE (1) | SE509754C2 (sv) |
WO (1) | WO1997015413A1 (sv) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE510841C2 (sv) * | 1996-12-19 | 1999-06-28 | Sandvik Ab | Hålsåg |
ES2294398T3 (es) * | 2000-09-01 | 2008-04-01 | Credo Technology Corporation | Disposicion de mandril de cambio rapido, para sierra de perforacion y broca de perforacion. |
DE10256050A1 (de) * | 2002-11-30 | 2004-06-09 | Hilti Ag | Werkzeugaufnahme für Kernbohrkronen |
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 (zh) * | 2013-02-01 | 2015-08-19 | 成都三锐工具制造有限公司 | 双金属孔锯接柄 |
KR101898989B1 (ko) * | 2018-04-03 | 2018-09-14 | 코리아에프에이(주) | 복합소재단열재 패널용 롱홀쏘 |
Family Cites Families (7)
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 |
US3784316A (en) * | 1972-07-12 | 1974-01-08 | Capewell Mfg Co | Hole saw and reversible quick disconnect drive therefor |
US3837759A (en) * | 1972-07-12 | 1974-09-24 | Capewell Mfg Co | Hole saw and 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. |
-
1995
- 1995-10-27 SE SE9503797A patent/SE509754C2/sv unknown
-
1996
- 1996-10-28 WO PCT/SE1996/001385 patent/WO1997015413A1/en active Application Filing
- 1996-10-28 EP EP96937619A patent/EP0858375A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9715413A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE9503797L (sv) | 1997-04-28 |
WO1997015413A1 (en) | 1997-05-01 |
SE509754C2 (sv) | 1999-03-01 |
SE9503797D0 (sv) | 1995-10-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE CH DE DK ES FI FR GB LI NL SE |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: KAPMAN AB |
|
17P | Request for examination filed |
Effective date: 19980528 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
17Q | First examination report despatched |
Effective date: 19980814 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20100313 |