CA2053498C - Chainsaw for lumber making - Google Patents
Chainsaw for lumber makingInfo
- Publication number
- CA2053498C CA2053498C CA 2053498 CA2053498A CA2053498C CA 2053498 C CA2053498 C CA 2053498C CA 2053498 CA2053498 CA 2053498 CA 2053498 A CA2053498 A CA 2053498A CA 2053498 C CA2053498 C CA 2053498C
- Authority
- CA
- Canada
- Prior art keywords
- bar
- carriage
- chainsaw
- cutting
- bed
- 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
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims 1
- 239000002023 wood Substances 0.000 abstract description 14
- 239000000843 powder Substances 0.000 abstract 1
- 230000036346 tooth eruption Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 2
- 241000489861 Maximus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- B27B17/02—Chain saws equipped with guide bar
-
- 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
- B27B17/0083—Attachments for guiding or supporting chain saws during operation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Manufacture Of Wood Veneers (AREA)
Abstract
A chainsaw consists essentialy of a motor driven chain with cutting teeth. Chainsaws are widely used for felling trees and for cutting long pieces of wood into shorter pieces. There are devices to guide a chainsaw axially along the grain, to make lumber from trees. All of these devices cut across the end grain of the wood.
It is well known that cutting across end grain is slow and energy consuming. The sawdust produced is a powder.
It is also known that a chainsaw held with the cutting edge parallel to the grain cuts a great deal faster, tearing out thin strips of wood instead of fine sawdust.
This invention is a means for presenting the cutting chain substantially parallel to the wood grain, and guiding it so as to cut flat surfaces of any length.
Tests have shown that my invention cuts lumber from three to ten times, (depending on the type of wood), faster than previously available chainsaw devices of equal power. This is achieved by a novel bar of approximately triangular shape carrying the cutting chain, and means to guide the bar to form a flat surface as long as any log. The novel bar and guide apparatus are described in the following specification.
It is well known that cutting across end grain is slow and energy consuming. The sawdust produced is a powder.
It is also known that a chainsaw held with the cutting edge parallel to the grain cuts a great deal faster, tearing out thin strips of wood instead of fine sawdust.
This invention is a means for presenting the cutting chain substantially parallel to the wood grain, and guiding it so as to cut flat surfaces of any length.
Tests have shown that my invention cuts lumber from three to ten times, (depending on the type of wood), faster than previously available chainsaw devices of equal power. This is achieved by a novel bar of approximately triangular shape carrying the cutting chain, and means to guide the bar to form a flat surface as long as any log. The novel bar and guide apparatus are described in the following specification.
Description
20534q8 SPECIFIC~TION
This invention relates to a chainsaw for making lumber.
chainsaw is a common hand held tool for cutting wood.
The cutting chain i5 driven by a small engine.
Inexpensive adapters are available to hold and guide the chainsaw to make boards~ but all of these devices present the chain to the end grain of the wood, a slow and energy consuming way of cutting. Commercial sawmills use thin bandsaws which remove less than one quarter as much wood as does a chainsaw~ and hence use 1ess power and cut faster. Portable bandsaws are available to compete with lumber making chainsaws~ but they are heavy and expensive, mainly suitable for full time c~mmercial operation. My invention is suitable for people making their own lumber~ -I have found that if the chainsaw chain is pressed into the wood with the cutting edge substantially parallel to the grain it cuts up to ten times faster than currently available chainsaw devices. The efficiency of the method is obvious when the resulting long thin shavings are compared with the fine sawdust produced by present devices which cut across the end grain of the wood.
An explanation follows of some words used in this specification: The "bar" of a chainsaw is a thin grooved steel plate which guides the chain. The "holder" of the present invention is apparatus for slidably attaching the chainsaw to a "carriage" which can be attached to a "bed". ~n "idler sprotket" is a sprocket in the bar groove which reduces the friction between the bar and the chain. ~ "kerf" is a cut~ or r:
2053498 ~ -the space left by the passage of the chain in cutting.
"cant" i5 a log of which at least one side has been flattened. "Lagging" is attaching an object to wood by means of lag screws, which are self-tapping screws.
In drawings which illustrate embodiments of the invention, Figure 1 is an elevation of a chainsaw with a triangular bar! and with a holder attached. The conventional chain is inJicated by dotted lines.
Figure ~ is an end elevation of the embodiment shown ;~
in Figure 1~ with the chain removeJ for clarity.
Figure 3 is an end elevation of a carriage.
Figure 4 is a side elevation of the carriage.
Figure ~ is a plan view of the carriage.
Figu-e b is an end elevation of the carriage lagged to a bed, which i5 clamped or lagged, by conventional means not shown~ to the roughly flattened side of a log.
Figure 7 is an end elevation, on Section B - B of Figures 8 and 9~ of a carriage designed to be clamped to a bed~ to which it is shown fastened.
Figure 8 is a plan view of the carriage and bed of Figure 7.
Figure 9 is a side elevation of the carriage of Figures 7 and 8. The bed is omitted for clarity.
Figure 10 is a side elevation of a saw and holder on a carriage mounted on a wedge shaped board called a slider~ the slider being mounted on a bed only part of which is shown.
Figure 11 is a partial end elevation on view ~ -of Figure 10.
,~
C ~
2053498 ~
The invention illustrated comprises a triangular bar 1 attached to a motor 2 by conventional means 3 and carrying a conventional cutting chain 4 driven by motor sprocket 5. Idler sprockets 6 are conventional though not essential parts of the invention. The working or cutting length of the chain is from point 7 to point 8.
In operation, the edge 7 - 8 is approximately parallel to the wood grain and is pressed into the wood by holder 9 sliding on bushings 10 on posts 11 of carriage 12.
Holder q is bolted by bolts 23 to bar 1 and spaced from it to clear the chain~ by spacers 24. Spacers 24 position bar 1 parallel to the posts 11 and parallel to the side 25 of carriage 12. Stop 22 forms additional support to maintain alignment of bar 1, the side of which rubs against it. Bar 1 i5 pushed through the thickness of the tree or cant, or until stopped at maximu,n depth of cut by bottom 13 of holder 9 touching the top surface of carriage 12 at 14.
In the embodiment shown in Figure 6, the carriage 12 may be bolted by two lag screws 15, in counterbored holes -2~ to the bed. a flat board 16~ which is clamped or lagged, by conventional means not shown, to a log 30.
Log 30 may be~ but is not necessarily, partly flattened to support bed 16. Bed ~6 has a straigh~ guide strip 17. Carriage 12 may be successively lagged at intervals not greater than the length of the cutting edge 7 - ~, with side 25 against strip 17~ to form a continuous kerf 18, as wide as the thickness of the chain 4, which is not shown in Figure 6. Bed 16 may be made of any flat board. lt will usually be a board cut by means of thi~
invention. A chalk line may be substituted for guide strip 17.
20534q8 In the embodiment shown in Figures 7~ 8, and 9, an alternative carriage lq is arranged to slide on a bed 21~ and be clamped to it at intervals by clamping means 20. the quick acting clamping means 20 saves a few seconds at each movement of the carriage 19 compared with driving the two lag screws 15. The embodiment shown in Figures 7 to 9 is particularly useful for cutting a number of cants, or timbers, of a given width.
This is achieved by cutting a kerf with the saw bar on one side of the bed, which is fixed to a log, and then reversing the carriage to cut a second kerf on the other side of the bed. The width of the carriage and matching bed may be chosen to give different widths of cant.
~lternatively, clamping means 20 may be laterally adjustable! by conventional means not shown, on bed 19 to give different overhangs of stop 22, and of bar I
with chain 4~ past the edge of bed 21~ and hence can be made adjustab'e for different widths of cant with one width of carriage and matching bed.
The embodiment shown in Figures 10 and 11 may also be used. Carriage 12 is clamped or screwed to slider 26~
which can be pushed along a bed 27. ~ bed such as bed 21 shown in Figure 7 is also suitable~ but the clamping ;~
means is left free to slide. ~The wedge angle of slider ~'G
26 is small~ for example ten degrees~ so that the cutting edge ~ - 8 of the chain is at a small angle to the grain. The depth of cut is controlled bylstops 28 which regulate the height of holder q at a given height `
on carriage 12. ~epeated cuts with lower positions of -the stops may be made for deeper kerfs.
` 2053498 While a triangular bar is shown~ the essential feature of my invention is a bar with the cutting edge remote from the apex where the motor is attached~ and with no width of the bar with chain wider than the cutting edge.
The phrase on page 1 of this specification! "cutting edge substantially parallel to the grain", is for contrast with conventional lumber making devices which use a cutting edge substantially normal to the grain.
In practice~ conventional devices may well be used about twenty degrees off the normal to the grain, while my inven~ion may be used in the order of twenty degrees away from parallel to the grain. For best results it will be close to parallel to the grain while plunging, and between eight and twenty degrees away from parallel when using the slider.
While Figure 1 shows the cutting edge 7-8 at ninety degrees to the axes of the bushings 10, the angle could be as low as seventy degrees, for example. If that angle is between eighty-two and seventy degrees, with the end ~ closer to the holder than end 7~ no special adapter such as slider 26 is needed for the sliding method of cutting.
Figures ~ 4~ 5! 6~ 8 and 9 show stop 22 as a simple button against which one side of bar I can slide. This stop can also be a bolt with a loosely fitting washer on each side of bar 1, which in this case must have a long vertical slot to accomodate the bolt. This will help to keep the bar 1 parallel to the carriage posts 11, compensating for play and flexibility in the system.
The slider of Figures 10 and 11 is one way of holding the cutting edge 7-~ at an anqle to the grain. ~ny other simple way of holding the bottom of carriage 12 free to slide at an angle on a bed such as 21, would be suitable. For example~ a base hinged and suitably supported to the bottom of carriage 12 could be used to change the angle for different types of wood.
... . ... f
This invention relates to a chainsaw for making lumber.
chainsaw is a common hand held tool for cutting wood.
The cutting chain i5 driven by a small engine.
Inexpensive adapters are available to hold and guide the chainsaw to make boards~ but all of these devices present the chain to the end grain of the wood, a slow and energy consuming way of cutting. Commercial sawmills use thin bandsaws which remove less than one quarter as much wood as does a chainsaw~ and hence use 1ess power and cut faster. Portable bandsaws are available to compete with lumber making chainsaws~ but they are heavy and expensive, mainly suitable for full time c~mmercial operation. My invention is suitable for people making their own lumber~ -I have found that if the chainsaw chain is pressed into the wood with the cutting edge substantially parallel to the grain it cuts up to ten times faster than currently available chainsaw devices. The efficiency of the method is obvious when the resulting long thin shavings are compared with the fine sawdust produced by present devices which cut across the end grain of the wood.
An explanation follows of some words used in this specification: The "bar" of a chainsaw is a thin grooved steel plate which guides the chain. The "holder" of the present invention is apparatus for slidably attaching the chainsaw to a "carriage" which can be attached to a "bed". ~n "idler sprotket" is a sprocket in the bar groove which reduces the friction between the bar and the chain. ~ "kerf" is a cut~ or r:
2053498 ~ -the space left by the passage of the chain in cutting.
"cant" i5 a log of which at least one side has been flattened. "Lagging" is attaching an object to wood by means of lag screws, which are self-tapping screws.
In drawings which illustrate embodiments of the invention, Figure 1 is an elevation of a chainsaw with a triangular bar! and with a holder attached. The conventional chain is inJicated by dotted lines.
Figure ~ is an end elevation of the embodiment shown ;~
in Figure 1~ with the chain removeJ for clarity.
Figure 3 is an end elevation of a carriage.
Figure 4 is a side elevation of the carriage.
Figure ~ is a plan view of the carriage.
Figu-e b is an end elevation of the carriage lagged to a bed, which i5 clamped or lagged, by conventional means not shown~ to the roughly flattened side of a log.
Figure 7 is an end elevation, on Section B - B of Figures 8 and 9~ of a carriage designed to be clamped to a bed~ to which it is shown fastened.
Figure 8 is a plan view of the carriage and bed of Figure 7.
Figure 9 is a side elevation of the carriage of Figures 7 and 8. The bed is omitted for clarity.
Figure 10 is a side elevation of a saw and holder on a carriage mounted on a wedge shaped board called a slider~ the slider being mounted on a bed only part of which is shown.
Figure 11 is a partial end elevation on view ~ -of Figure 10.
,~
C ~
2053498 ~
The invention illustrated comprises a triangular bar 1 attached to a motor 2 by conventional means 3 and carrying a conventional cutting chain 4 driven by motor sprocket 5. Idler sprockets 6 are conventional though not essential parts of the invention. The working or cutting length of the chain is from point 7 to point 8.
In operation, the edge 7 - 8 is approximately parallel to the wood grain and is pressed into the wood by holder 9 sliding on bushings 10 on posts 11 of carriage 12.
Holder q is bolted by bolts 23 to bar 1 and spaced from it to clear the chain~ by spacers 24. Spacers 24 position bar 1 parallel to the posts 11 and parallel to the side 25 of carriage 12. Stop 22 forms additional support to maintain alignment of bar 1, the side of which rubs against it. Bar 1 i5 pushed through the thickness of the tree or cant, or until stopped at maximu,n depth of cut by bottom 13 of holder 9 touching the top surface of carriage 12 at 14.
In the embodiment shown in Figure 6, the carriage 12 may be bolted by two lag screws 15, in counterbored holes -2~ to the bed. a flat board 16~ which is clamped or lagged, by conventional means not shown, to a log 30.
Log 30 may be~ but is not necessarily, partly flattened to support bed 16. Bed ~6 has a straigh~ guide strip 17. Carriage 12 may be successively lagged at intervals not greater than the length of the cutting edge 7 - ~, with side 25 against strip 17~ to form a continuous kerf 18, as wide as the thickness of the chain 4, which is not shown in Figure 6. Bed 16 may be made of any flat board. lt will usually be a board cut by means of thi~
invention. A chalk line may be substituted for guide strip 17.
20534q8 In the embodiment shown in Figures 7~ 8, and 9, an alternative carriage lq is arranged to slide on a bed 21~ and be clamped to it at intervals by clamping means 20. the quick acting clamping means 20 saves a few seconds at each movement of the carriage 19 compared with driving the two lag screws 15. The embodiment shown in Figures 7 to 9 is particularly useful for cutting a number of cants, or timbers, of a given width.
This is achieved by cutting a kerf with the saw bar on one side of the bed, which is fixed to a log, and then reversing the carriage to cut a second kerf on the other side of the bed. The width of the carriage and matching bed may be chosen to give different widths of cant.
~lternatively, clamping means 20 may be laterally adjustable! by conventional means not shown, on bed 19 to give different overhangs of stop 22, and of bar I
with chain 4~ past the edge of bed 21~ and hence can be made adjustab'e for different widths of cant with one width of carriage and matching bed.
The embodiment shown in Figures 10 and 11 may also be used. Carriage 12 is clamped or screwed to slider 26~
which can be pushed along a bed 27. ~ bed such as bed 21 shown in Figure 7 is also suitable~ but the clamping ;~
means is left free to slide. ~The wedge angle of slider ~'G
26 is small~ for example ten degrees~ so that the cutting edge ~ - 8 of the chain is at a small angle to the grain. The depth of cut is controlled bylstops 28 which regulate the height of holder q at a given height `
on carriage 12. ~epeated cuts with lower positions of -the stops may be made for deeper kerfs.
` 2053498 While a triangular bar is shown~ the essential feature of my invention is a bar with the cutting edge remote from the apex where the motor is attached~ and with no width of the bar with chain wider than the cutting edge.
The phrase on page 1 of this specification! "cutting edge substantially parallel to the grain", is for contrast with conventional lumber making devices which use a cutting edge substantially normal to the grain.
In practice~ conventional devices may well be used about twenty degrees off the normal to the grain, while my inven~ion may be used in the order of twenty degrees away from parallel to the grain. For best results it will be close to parallel to the grain while plunging, and between eight and twenty degrees away from parallel when using the slider.
While Figure 1 shows the cutting edge 7-8 at ninety degrees to the axes of the bushings 10, the angle could be as low as seventy degrees, for example. If that angle is between eighty-two and seventy degrees, with the end ~ closer to the holder than end 7~ no special adapter such as slider 26 is needed for the sliding method of cutting.
Figures ~ 4~ 5! 6~ 8 and 9 show stop 22 as a simple button against which one side of bar I can slide. This stop can also be a bolt with a loosely fitting washer on each side of bar 1, which in this case must have a long vertical slot to accomodate the bolt. This will help to keep the bar 1 parallel to the carriage posts 11, compensating for play and flexibility in the system.
The slider of Figures 10 and 11 is one way of holding the cutting edge 7-~ at an anqle to the grain. ~ny other simple way of holding the bottom of carriage 12 free to slide at an angle on a bed such as 21, would be suitable. For example~ a base hinged and suitably supported to the bottom of carriage 12 could be used to change the angle for different types of wood.
... . ... f
Claims (8)
1. An approximately triangular chainsaw bar which comprises a first apex designed to accomodate a sprocket driven by driving means, and an opposite side defining a cutting portion which is thinner than the width of a cutting chain mounted thereon, a guiding holder attached to the bar, and a carriage on which the holder slidably guides the bar, said cutting chain guided by grooves in the edges of the chainsaw bar and driven by said sprocket, said cutting portion being free of any attachment which could prevent any part of the cutting portion from entering into a kerf cut by the chain, a means of attachment of the bar to a chainsaw motor driving said sprocket, and a means of attachment of the bar to the guiding holder, said holder designed to slide on the carriage, permitting penetration of the cutting portion of the bar into a log, said carriage suitable for mounting on any flat surface, or on tracks, to facilitate consecutive plunge cuts connecting to each other, along the axis of the chainsaw bar, to produce a straight kerf of any length and of a maximum depth equal to the height of the cutting portion of the bar normal to the cutting edge of said bar.
2. The chainsaw bar of claim 1 which comprises idler sprockets in the edges of the bar to guide the chain, in combination with grooves or without grooves.
3. The chainsaw bar of claim 2 which comprises a holder with at least two bushings or guides parallel to the plane of the cutting portion of the bar and at an angle, usually, but not necessarily, ninety degrees, to the cutting edge of the bar.
4. The chainsaw bar of claim 3 which comprises a carriage with at least two posts, upon which the holder of claim 3 is slidably mounted with the cutting edge of the bar approximately parallel to the base of the carriage, suitable for mounting on a log or a bed, to which it may be screwed or clamped in a series of positions so that consecutive plunge cuts may make a continuous straight kerf.
5. A bed in the form of a symmetrical track to receive a carriage as defined in claim 4, so that the chainsaw bar cutting portion may be plunged first on one side of the bed to form a kerf of a desired length and then on the other side of the bed, to cut a cant of a given width with one position of the bed on a log.
6. A wedge shaped slider to adapt a carriage as defined in claim 4 so that it can be slid along a bed with the cutting edge of the chainsaw bar at a small angle to the plane of the bed.
7. Means such as clamps or spacers for fixing the holder at different heights on the carriage so that cuts of chosen depth may be made using a slider as defined in claim 6.
8. A carriage as defined in claim 4 comprising a stop near the base of the carriage, against which the cutting portion of the bar will slide when it is exactly parallel to the posts of the carriage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2053498 CA2053498C (en) | 1991-10-15 | 1991-10-15 | Chainsaw for lumber making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2053498 CA2053498C (en) | 1991-10-15 | 1991-10-15 | Chainsaw for lumber making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2053498A1 CA2053498A1 (en) | 1993-04-16 |
| CA2053498C true CA2053498C (en) | 1995-05-23 |
Family
ID=4148564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2053498 Expired - Fee Related CA2053498C (en) | 1991-10-15 | 1991-10-15 | Chainsaw for lumber making |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2053498C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016086987A1 (en) * | 2014-12-03 | 2016-06-09 | V-Cut Ab | Guiding device for a power driven saw |
| CN113973605A (en) * | 2021-10-26 | 2022-01-28 | 国网辽宁省电力有限公司辽阳供电公司 | Pruning device for super-high branches below power transmission line |
-
1991
- 1991-10-15 CA CA 2053498 patent/CA2053498C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2053498A1 (en) | 1993-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |