CA2162388C - Chain saw - Google Patents
Chain saw Download PDFInfo
- Publication number
- CA2162388C CA2162388C CA002162388A CA2162388A CA2162388C CA 2162388 C CA2162388 C CA 2162388C CA 002162388 A CA002162388 A CA 002162388A CA 2162388 A CA2162388 A CA 2162388A CA 2162388 C CA2162388 C CA 2162388C
- Authority
- CA
- Canada
- Prior art keywords
- chain
- drive
- toothwheel
- flange
- ridge
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/003—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for chain saws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B17/00—Chain saws; Equipment therefor
- B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Gears, Cams (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
- Dry Shavers And Clippers (AREA)
- Photoreceptors In Electrophotography (AREA)
- Liquid Crystal (AREA)
Abstract
The chain saw includes a motor (2), a chain flange (3), a chain (6), a chain flange lock (5), and a drive toothwheel (4) on the motor axle secured to it by key locking (12) and driving the chain (6). The drive toothwheel (4) is noticeably wide in the direction of the axle in comparison to the width of the chain (6) and it has a ridge (7) in die centre higher than the teeth (8) manufactured from the same blank and dividing the drive toothwheel (4) into two, with an open tooth section (4.1, 4.2) at both sides, one of which is in use and the other in reserve.
Description
WO 94127795 ,~ ~ PCT/FI94/00226 CHAIN SAW
The object of the invention is a chain saw, which includes a motor, a chain flange, a chain, a chain flange lock, and a drive toothwheel on the motor axle secured to it by key locking and driving the chain.
Chain saws are used a great deal in forestry. The power of chain saws in relation to size and weight is superior in comparison to e.g. circular saws. A problem, however, lies in the wear in the chains, cutting flanges, and drive toothwheels, and especially in timber harvesters in the chain remaining in place. Parti-cularly during felling, when the axle of the drive toothwheel is vertical, there is much to be desired in the ability of the chain to remain on the drive toothwheel.
At present, the so-called solid wheel is regarded as best, i.e.
that in which the outer surface of the drive toothwheel is smooth, with only depressions made in the surface of the wheel for the drive links. This kind of drive toothwheel controls and keeps the chain in the right position. But branches and other small pieces of wood more than 5 mm in diameter are easily pulled in between the chain and the wheel. The chain then rises out of the depressions and is often also damaged. Further, for reasons of manufacture it is not worth making wheels of this kind wide in the direction of the axle. Therefore the drive toothwheel wears the axle and key.
Previously so-called open tooth drive wheels were made wider in order to thus reduce the stress between the axle and the wheel.
But it is difficult to direct a wide open tooth drive wheel laterally. In addition, here too pieces are easily drawn between the chain and the tooth, but these seldom damage the chain.
The intention of the invention is to create a new kind of chain saw, by means of which the aforementioned faults in known chain saws are avoided. The characteristic features of the invention are presented in the accompanying Patent Claims. When the WO 94/27795 ~ ~ ~ ~ PCT/FI94/00226 toothing is made open on both sides in accordance with the invention, chains of varying width will fit the drive tooth-wheel. The chain will, however, remain on top, because there is a ridge in the centre of the toothwheel that it higher than the toothing. The toothwheel ridge gives considerable additional support to the toothing, theteeth of which are strengthened. '' For this reason it is easy the carry out heat-treatment. Other advantages and forms of application of the invention appear in connection with the following example of application.
In what follows the invention is illustrated by reference to the accompanying Figures, which show one chain saw in accordance with the invention, and the drive toothwheel used in it.
Figure 1 shows the chain saw from in front, with the drive wheel in partial cross-section.
Figure 2 shows the chain driver and the flange driver without flange or chain.
Figures 3 and 4 show the drive toothwheel in detail.
The principal components of the chain saw are the motor 2, chain flange 3, chain 6, chain flange lock 5, and the drive toothwheel 4 driving the chain. The chain flange lock can be seen in Figures 1 and 2. The flange 3 is pushed in a known manner over bolts 5 and 3 up to the drive toothwheel 4 and is tightened on the counter-member 5.2 by means of nuts 5.4 on the bolts 5.3. In Figure 4 the drive toothwheel 4 is attached to the motor axle by means of key locking. Roller 13 is attached to the end of the axle by bolt 14 and preventing drive toothwheel 4 from detaching itself. In accordance with Figure 1 the teeth 8 of the drive toothwheel 4 drive the counter-teeth of the chain 6, which run in the groove in the flange in a manner that is, as such, known.
The chain includes a cutting tooth 6.2, in order to protect ;A
which the ridge is sloped, as shown later. In accordance with Figure 2 there are two tooth parts 4.1 and 4.2 in drive tooth-wheel 4 and between them a ridge 7 formed from the same blank.
The chain thus settles on the drive toothwheel 4.1 between the ridge 7 and the flange driver 10.
The object of the invention is a chain saw, which includes a motor, a chain flange, a chain, a chain flange lock, and a drive toothwheel on the motor axle secured to it by key locking and driving the chain.
Chain saws are used a great deal in forestry. The power of chain saws in relation to size and weight is superior in comparison to e.g. circular saws. A problem, however, lies in the wear in the chains, cutting flanges, and drive toothwheels, and especially in timber harvesters in the chain remaining in place. Parti-cularly during felling, when the axle of the drive toothwheel is vertical, there is much to be desired in the ability of the chain to remain on the drive toothwheel.
At present, the so-called solid wheel is regarded as best, i.e.
that in which the outer surface of the drive toothwheel is smooth, with only depressions made in the surface of the wheel for the drive links. This kind of drive toothwheel controls and keeps the chain in the right position. But branches and other small pieces of wood more than 5 mm in diameter are easily pulled in between the chain and the wheel. The chain then rises out of the depressions and is often also damaged. Further, for reasons of manufacture it is not worth making wheels of this kind wide in the direction of the axle. Therefore the drive toothwheel wears the axle and key.
Previously so-called open tooth drive wheels were made wider in order to thus reduce the stress between the axle and the wheel.
But it is difficult to direct a wide open tooth drive wheel laterally. In addition, here too pieces are easily drawn between the chain and the tooth, but these seldom damage the chain.
The intention of the invention is to create a new kind of chain saw, by means of which the aforementioned faults in known chain saws are avoided. The characteristic features of the invention are presented in the accompanying Patent Claims. When the WO 94/27795 ~ ~ ~ ~ PCT/FI94/00226 toothing is made open on both sides in accordance with the invention, chains of varying width will fit the drive tooth-wheel. The chain will, however, remain on top, because there is a ridge in the centre of the toothwheel that it higher than the toothing. The toothwheel ridge gives considerable additional support to the toothing, theteeth of which are strengthened. '' For this reason it is easy the carry out heat-treatment. Other advantages and forms of application of the invention appear in connection with the following example of application.
In what follows the invention is illustrated by reference to the accompanying Figures, which show one chain saw in accordance with the invention, and the drive toothwheel used in it.
Figure 1 shows the chain saw from in front, with the drive wheel in partial cross-section.
Figure 2 shows the chain driver and the flange driver without flange or chain.
Figures 3 and 4 show the drive toothwheel in detail.
The principal components of the chain saw are the motor 2, chain flange 3, chain 6, chain flange lock 5, and the drive toothwheel 4 driving the chain. The chain flange lock can be seen in Figures 1 and 2. The flange 3 is pushed in a known manner over bolts 5 and 3 up to the drive toothwheel 4 and is tightened on the counter-member 5.2 by means of nuts 5.4 on the bolts 5.3. In Figure 4 the drive toothwheel 4 is attached to the motor axle by means of key locking. Roller 13 is attached to the end of the axle by bolt 14 and preventing drive toothwheel 4 from detaching itself. In accordance with Figure 1 the teeth 8 of the drive toothwheel 4 drive the counter-teeth of the chain 6, which run in the groove in the flange in a manner that is, as such, known.
The chain includes a cutting tooth 6.2, in order to protect ;A
which the ridge is sloped, as shown later. In accordance with Figure 2 there are two tooth parts 4.1 and 4.2 in drive tooth-wheel 4 and between them a ridge 7 formed from the same blank.
The chain thus settles on the drive toothwheel 4.1 between the ridge 7 and the flange driver 10.
Roller 13 that retains the drive toothwheel forms itself a chain retainer, if the chain breaks. This roller 13, which is essen-tially smaller than the drive toothwheel, is very wide in relation to the width of the chain and includes a cylindrical component 13.1 and flanges 13.2.
J
In accordance with Figures 3 and 4 the drive toothwheel has a considerable width in comparison to the width of the chain, when the keyway 12 carries the rotating force with a smaller surface pressure than previously. Material is milled away from a blank of ridge height using an NC milling machine in such a way that teeth 8 are formed on both sides. In accordance with Figure 4 the upper part of the ridge 7 includes a slope 9, which protects the cutting blade 6.2, see Figure 1. The diameter of the ridge is advantageously about 10 mm higher than the toothing. The sloping ridge keeps the chain laterally in place,~precise during felling, because during felling the flange places itself below the chain. The ridge effectively prevents pieces of wood from getting between the chain and the teeth.
Whereas known types of drive toothwheels intended for 8 - 9 mm wide chains are 12 mm wide, the drive toothwheel in accordance with the invention is 25 mm wide. It has two 10 mm wide com-ponents and a 5 mm wide ridge. The slope of the ridge gives slightly more space for the chain. A larger drive toothwheel is used for larger chains.
J
In accordance with Figures 3 and 4 the drive toothwheel has a considerable width in comparison to the width of the chain, when the keyway 12 carries the rotating force with a smaller surface pressure than previously. Material is milled away from a blank of ridge height using an NC milling machine in such a way that teeth 8 are formed on both sides. In accordance with Figure 4 the upper part of the ridge 7 includes a slope 9, which protects the cutting blade 6.2, see Figure 1. The diameter of the ridge is advantageously about 10 mm higher than the toothing. The sloping ridge keeps the chain laterally in place,~precise during felling, because during felling the flange places itself below the chain. The ridge effectively prevents pieces of wood from getting between the chain and the teeth.
Whereas known types of drive toothwheels intended for 8 - 9 mm wide chains are 12 mm wide, the drive toothwheel in accordance with the invention is 25 mm wide. It has two 10 mm wide com-ponents and a 5 mm wide ridge. The slope of the ridge gives slightly more space for the chain. A larger drive toothwheel is used for larger chains.
Claims (5)
1. A chain saw, which includes a motor, a chain flange, a chain, a chain flange lock, and a drive toothwheel on the motor axle secured to it by key locking and driving the chain, characterized in that the drive toothwheel is wider in the direction of the axle than the width of the chain and that it has a ridge in the centre higher than the teeth manufactured from the same blank and dividing the drive toothwheel into two, with an open tooth section at both sides, one of which is in use and the other in reserve.
2. A chain saw in accordance with claim 1, characterized in that the ridge of the drive toothwheel has a slope on both sides in order to protect the cutting tooth of the chain.
3. A chain saw in accordance with either one of claims 1 or 2, characterized in that the ridge of the drive toothwheel extends on top of the chain flange.
4. A chain saw in accordance with any one of claims 1 to 3, characterized in that there is a roller essentially smaller than the drive toothwheel and equipped with an end flange and forming a chain retainer, which also locks the drive toothwheel onto the axle.
5. A chain saw in accordance with any one of claims 1 to 4, characterized in that there is a chain flange driver in connection with the motor, against which the drive toothwheel is placed, when the chain remains between the aforementioned ridge and the flange driver.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI932525 | 1993-06-02 | ||
| FI932525A FI932525A0 (en) | 1993-06-02 | 1993-06-02 | Dragtrissa Foer kedjesaog |
| FI941275 | 1994-03-18 | ||
| FI941275A FI92917C (en) | 1993-06-02 | 1994-03-18 | chainsaw |
| PCT/FI1994/000226 WO1994027795A1 (en) | 1993-06-02 | 1994-06-01 | Chain saw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2162388A1 CA2162388A1 (en) | 1994-12-08 |
| CA2162388C true CA2162388C (en) | 2005-04-19 |
Family
ID=26159506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002162388A Expired - Fee Related CA2162388C (en) | 1993-06-02 | 1994-06-01 | Chain saw |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU680502B2 (en) |
| CA (1) | CA2162388C (en) |
| DE (2) | DE4493497T1 (en) |
| FI (1) | FI92917C (en) |
| WO (1) | WO1994027795A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3967698A (en) * | 1975-03-20 | 1976-07-06 | Mcgraw-Edison Company | Oiler for power chain saw |
| US4776826A (en) * | 1988-03-14 | 1988-10-11 | Blount, Inc. | Chain saw drive sprocket with wear mark indicators |
| SE467402B (en) * | 1990-11-12 | 1992-07-13 | Electrolux Ab | DEVICE IN MOTOR SAW |
-
1994
- 1994-03-18 FI FI941275A patent/FI92917C/en active
- 1994-06-01 DE DE4493497T patent/DE4493497T1/en active Pending
- 1994-06-01 WO PCT/FI1994/000226 patent/WO1994027795A1/en active Application Filing
- 1994-06-01 CA CA002162388A patent/CA2162388C/en not_active Expired - Fee Related
- 1994-06-01 AU AU67988/94A patent/AU680502B2/en not_active Ceased
- 1994-06-01 DE DE4493497A patent/DE4493497C2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO1994027795A1 (en) | 1994-12-08 |
| AU680502B2 (en) | 1997-07-31 |
| FI941275A0 (en) | 1994-03-18 |
| FI92917B (en) | 1994-10-14 |
| FI92917C (en) | 1995-01-25 |
| DE4493497T1 (en) | 1996-05-09 |
| CA2162388A1 (en) | 1994-12-08 |
| DE4493497C2 (en) | 2002-01-03 |
| AU6798894A (en) | 1994-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |