AU701803B2 - Angle measuring device - Google Patents
Angle measuring device Download PDFInfo
- Publication number
- AU701803B2 AU701803B2 AU13259/97A AU1325997A AU701803B2 AU 701803 B2 AU701803 B2 AU 701803B2 AU 13259/97 A AU13259/97 A AU 13259/97A AU 1325997 A AU1325997 A AU 1325997A AU 701803 B2 AU701803 B2 AU 701803B2
- Authority
- AU
- Australia
- Prior art keywords
- holder
- measuring device
- angle measuring
- recesses
- guide bar
- 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.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G23/00—Forestry
- A01G23/02—Transplanting, uprooting, felling or delimbing trees
- A01G23/08—Felling trees
- A01G23/091—Sawing apparatus specially adapted for felling trees
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Lubricants (AREA)
- Body Structure For Vehicles (AREA)
- Vehicle Body Suspensions (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Description
WO 97/25855 PCTISE97100028 1 ANGLE MEASURING DEVICE Background Vehicle-born chain saws for harvesting of trees comprise a felling head with a motor, usually hydraulic, and a guide bar with a saw chain. The guide bar is rotated around the drive shaft of the motor when the tree trunk is to be sawn through, and it should also be radially movable to keep the chain tensioned with appropriate force. A chain saw drive device with these functions is described in patent application SE 95 00754-8.
As is described in patent application SE 92 00610-5 and FI 95 0360 it is desirable to reduce the rotation angle of the guide bar to the least possible value, to save cutting time, and in case the sawing is combined with spraying of the sawn surface with licquids such j as fungicide or marking paint, to avoid spilling licquid outside the sawn surface. To achieve this, the angular motion must be measured, to ensure that the licquid spray starts and stops at the edges of the sawn surface, and that the return motion of the guide bar is started at the right time.
SE 92 00610-5 shows how the angular position can be measured by a separate angular measuring device, connected to the guide bar through a geared connecting device. FI 0360 describes how the angle can be calculated by measuring the volume of hydraulic fluid pumped to the hydraulic positioning device. The present invention concerns an angular measuring device which is designed and located to be very insensitive to damage in spite of the difficult physical environment with sawdust, vibrations and impacts against the ground.
Description An angular measuring device according to the invention is preferrably installed on a chain saw drive device such as described by SE 95 00754-8, as shown in figure 1. The drive device and the guide bar are located between an upper guard plate (11) and a lower guard plate both being stationary parts of the felling head. A drive motor (13) is /4 30 partially recessed through the upper guard plate (11) and attached to it by a flange A bearing device (15) is attached to a cylindrical part of the motor exterior below the upper
[CONFIRMATION
A
WO 97/25855 PCT/SE97/00028 2 guard plate and allows rotation of a bar holder (16) around the motor shaft. On the underside of the holder is a clamping device (17) to which the guide bar (18) is attached and which is radially displacable relative to the holder The holder is rotated during sawing by a hydraulic cylinder (20) acting on a bolt (19) on the holder.
The underside of the motor flange (14) and the upper side of the holder (16) are in sliding contact over a flat contact surface (21) which is robust and well protected from external damage. For transfer of licquids such as lubricating oil, fungicide or marking paint to the guide bar, this surface can be partially made as a swivel device with concentric grooves and seals.
According to the invention, this contact surface (21) is also as shown in figure 2 made with a magnetically observable angular scale formed by a multitude of recesses (22) located along a circular arc. The recesses are preferrably made as round holes with equal distances. The angular scale is read by one or two magnetic heads recessed into the drive motor flange Two reading heads at another distance than between the holes (22) allows determination of the rotational direction and a higher precision.
If the contact surface (21) is used for a licquid swivel as well as an angular scale, the recesses (22) of the scale are preferably located radially outside of the swivel grooves, to get best resolution and precision.
4
I
ue
Claims (3)
1. Angle measuring device for vehicle-born chain saws, where a guide bar (18) is held by a rotatable holder characterized by the upper side of the holder (16) being in sliding contact with the underside of a non-rotatable part (14) over a flat contact surface (21), and the upper side of the holder (16) being provided with a multitude of recesses (22) along a circular arc the center of which is the axis of rotation of the holder, and the underside of the non-rotatable part (14) being provided with at least one magnetic head for registering the magnetic variations caused by the recesses.
2. Angle measuring device according to claim 1, characterized by the contact surface i (21) radially inwards from the circular arc being provided with concentric grooves and l seals to form a swivel device for conveying licquids from the non-rotatable part (14) to the holder (16) and the guide bar (18).
3. Angle measuring device according to claim 1 or 2, characterized by the recesses (22) being made as round holes with uniform distances. S!1 ,)6
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9600136 | 1996-01-16 | ||
| SE9600136A SE509752C2 (en) | 1996-01-16 | 1996-01-16 | protractor |
| PCT/SE1997/000028 WO1997025855A1 (en) | 1996-01-16 | 1997-01-14 | Angle measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1325997A AU1325997A (en) | 1997-08-11 |
| AU701803B2 true AU701803B2 (en) | 1999-02-04 |
Family
ID=20401027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU13259/97A Ceased AU701803B2 (en) | 1996-01-16 | 1997-01-14 | Angle measuring device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0876092A1 (en) |
| AU (1) | AU701803B2 (en) |
| CA (1) | CA2242241A1 (en) |
| SE (1) | SE509752C2 (en) |
| WO (1) | WO1997025855A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20215301A1 (en) * | 2021-03-19 | 2022-09-20 | Kesla Oyj | Chain saw |
-
1996
- 1996-01-16 SE SE9600136A patent/SE509752C2/en not_active IP Right Cessation
-
1997
- 1997-01-14 AU AU13259/97A patent/AU701803B2/en not_active Ceased
- 1997-01-14 EP EP97900838A patent/EP0876092A1/en not_active Ceased
- 1997-01-14 CA CA 2242241 patent/CA2242241A1/en not_active Abandoned
- 1997-01-14 WO PCT/SE1997/000028 patent/WO1997025855A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997025855A1 (en) | 1997-07-24 |
| SE509752C2 (en) | 1999-03-01 |
| CA2242241A1 (en) | 1997-07-24 |
| AU1325997A (en) | 1997-08-11 |
| EP0876092A1 (en) | 1998-11-11 |
| SE9600136L (en) | 1997-07-17 |
| SE9600136D0 (en) | 1996-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC | Assignment registered |
Owner name: BLOUNT, INC. Free format text: FORMER OWNER WAS: KAPMAN AB |
|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |