CA1045519A - Guide bar with saw chain oiling feature - Google Patents
Guide bar with saw chain oiling featureInfo
- Publication number
- CA1045519A CA1045519A CA292,779A CA292779A CA1045519A CA 1045519 A CA1045519 A CA 1045519A CA 292779 A CA292779 A CA 292779A CA 1045519 A CA1045519 A CA 1045519A
- Authority
- CA
- Canada
- Prior art keywords
- oil
- guide bar
- saw
- chain
- groove
- 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
Links
Landscapes
- Sawing (AREA)
Abstract
ABSTRACT
A guide bar for a chain saw which includes a groove formed in the edge thereof for guiding the drive tangs of a saw chain. An oil hole is provided in the guide bar for injecting oil into the bottom of the groove to be picked up by the drive tangs for lubricating the saw chain. A depression forming a well for the oil is provided in the groove bottom where the oil is located, and the side of the depression in the direction of the driven chain is m inclined to provide a ramping effect for the oil. Immediately preceding the depression, the groove bottom is raised to provide a dam that reduces the occurrence of saw dust spilling into and filling the depression.
A guide bar for a chain saw which includes a groove formed in the edge thereof for guiding the drive tangs of a saw chain. An oil hole is provided in the guide bar for injecting oil into the bottom of the groove to be picked up by the drive tangs for lubricating the saw chain. A depression forming a well for the oil is provided in the groove bottom where the oil is located, and the side of the depression in the direction of the driven chain is m inclined to provide a ramping effect for the oil. Immediately preceding the depression, the groove bottom is raised to provide a dam that reduces the occurrence of saw dust spilling into and filling the depression.
Description
5S~
This invention relates to guide bars for chain saws and more particularly to a guide bar provided with means for lubricating a saw chain when mounted on the guide bar.
It is important to provide lubrication between the contacting sur-faces of a saw chain guide bar and the saw chain which is entrained thereon.
The saw chain is driven around the guide bar with the side links supported on the side rails of the bar. The side links thus slide along these side rails and without lubrication, the resulting friction causes rapid wearing of the chain and bar, reduction in the cutting capabilities and abuse of the chain saw motor.
Whereas lubricating oil can be applied directly to the chain, it is preferred to provide a small hole in the guide bar that leads into the bar groove wherein the drive tangs of the saw chain are entrained. The oil is ~ .
picked up by the drive tangs at a point along the top of the bar and as the chain is driven around the nose and back under the bar, the oil flows out- ;~
wardly to lubricate the chain elements.
Problems generally encountered with the above preferred lubrication method are two-fold. ~hereas the drive tangs do not normally engage the `~-bottom of the groove, the oil level has to be raised within the groove to a height sufficient to be engaged by the drive tangs. Also whereas the function o the saw chain is to cut wood, saw dust typically covers the chain elements and works its way into the bar groove and is moved along the groove by the drlve links. Bits of saw dust get into the oil hole and block the oil pas-sage.
A number of developments have attempted to obviate these problems.
Por example, placing the oil inlet to feed oil into the bar groove at a point above the groove bottom and directly into the path of the drive tangs is beneficial. The drive tangs pick up the oil directly at the inlet and by constantly scraping over the opening the drive tangs keep the saw dust clean-ed awar from the oil hole, see United States Patent No. 3J581,783J issued : ,~-, , . ' ' ' ' ' `:
~45~9 :
....,. ~ ~
June 1, 1971 to K.L. Sandin, which discloses such an oil hole placement and additionally shows a ramp like raised portion on which the oil is deposited to be picked up ~y the drive tangs. However, a number of chain saw designs require the oil hole to be placed at the groove bottom, and it is to these designs and the resulting problems described above that the present invention , is directed.
According to the present invention there is provided a guide bar for a chain saw including a groove along its edge for entraining the drive tangs of a saw chain, said guide bar comprising; a depression in the groove bottom forming an oil well, an oil conduit formed through a side of the bar and into the oil well for injecting oil into the oil well, said oil well hav-ing an inclined forward bottom wall forming a ramp for the oil to be forced forwardly into the path of the drive tangs.
Preferably, the groove bottom is raised just prior to the depression so that saw dust pushed over the raised portion is carried past the depression.
In the accompanying drawings which illustrate exemplary embodiments of the present invention:
Figure 1 schematically illustrates a chain saw with the saw chain driven around a guide bar for cutting a log; and ~igure 2 is an enlarged partial view which is sectional in part to illustrate the oiling feature.
.
Referring to the drawings, a chain saw 10 includes a guide bar 12 ~ ~
: . :
mounted to a power head 14. A saw chain 16 is entrained on the guide bar and around a drive sprocket 18 which is rotatively driven by the drive shaft 20 ..... .
of the power head. ;
The saw chain 16 includes a series of interconnected links consist- ~ ~
.: .
ing of side links 22 and center links 24. The center links 24 have depending j .
drive tangs 26 that engage the teeth of the drive sprocket 18 to be driven -thereby and while positioned on the guide bar 12 are entrained within a .
; 30 ~groove~28 formed in the edge of the guide bar. The side links 22, some of -: .,-, :.
. .
This invention relates to guide bars for chain saws and more particularly to a guide bar provided with means for lubricating a saw chain when mounted on the guide bar.
It is important to provide lubrication between the contacting sur-faces of a saw chain guide bar and the saw chain which is entrained thereon.
The saw chain is driven around the guide bar with the side links supported on the side rails of the bar. The side links thus slide along these side rails and without lubrication, the resulting friction causes rapid wearing of the chain and bar, reduction in the cutting capabilities and abuse of the chain saw motor.
Whereas lubricating oil can be applied directly to the chain, it is preferred to provide a small hole in the guide bar that leads into the bar groove wherein the drive tangs of the saw chain are entrained. The oil is ~ .
picked up by the drive tangs at a point along the top of the bar and as the chain is driven around the nose and back under the bar, the oil flows out- ;~
wardly to lubricate the chain elements.
Problems generally encountered with the above preferred lubrication method are two-fold. ~hereas the drive tangs do not normally engage the `~-bottom of the groove, the oil level has to be raised within the groove to a height sufficient to be engaged by the drive tangs. Also whereas the function o the saw chain is to cut wood, saw dust typically covers the chain elements and works its way into the bar groove and is moved along the groove by the drlve links. Bits of saw dust get into the oil hole and block the oil pas-sage.
A number of developments have attempted to obviate these problems.
Por example, placing the oil inlet to feed oil into the bar groove at a point above the groove bottom and directly into the path of the drive tangs is beneficial. The drive tangs pick up the oil directly at the inlet and by constantly scraping over the opening the drive tangs keep the saw dust clean-ed awar from the oil hole, see United States Patent No. 3J581,783J issued : ,~-, , . ' ' ' ' ' `:
~45~9 :
....,. ~ ~
June 1, 1971 to K.L. Sandin, which discloses such an oil hole placement and additionally shows a ramp like raised portion on which the oil is deposited to be picked up ~y the drive tangs. However, a number of chain saw designs require the oil hole to be placed at the groove bottom, and it is to these designs and the resulting problems described above that the present invention , is directed.
According to the present invention there is provided a guide bar for a chain saw including a groove along its edge for entraining the drive tangs of a saw chain, said guide bar comprising; a depression in the groove bottom forming an oil well, an oil conduit formed through a side of the bar and into the oil well for injecting oil into the oil well, said oil well hav-ing an inclined forward bottom wall forming a ramp for the oil to be forced forwardly into the path of the drive tangs.
Preferably, the groove bottom is raised just prior to the depression so that saw dust pushed over the raised portion is carried past the depression.
In the accompanying drawings which illustrate exemplary embodiments of the present invention:
Figure 1 schematically illustrates a chain saw with the saw chain driven around a guide bar for cutting a log; and ~igure 2 is an enlarged partial view which is sectional in part to illustrate the oiling feature.
.
Referring to the drawings, a chain saw 10 includes a guide bar 12 ~ ~
: . :
mounted to a power head 14. A saw chain 16 is entrained on the guide bar and around a drive sprocket 18 which is rotatively driven by the drive shaft 20 ..... .
of the power head. ;
The saw chain 16 includes a series of interconnected links consist- ~ ~
.: .
ing of side links 22 and center links 24. The center links 24 have depending j .
drive tangs 26 that engage the teeth of the drive sprocket 18 to be driven -thereby and while positioned on the guide bar 12 are entrained within a .
; 30 ~groove~28 formed in the edge of the guide bar. The side links 22, some of -: .,-, :.
. .
2 -..... ..
, '' ' ~L~455~9 which include cutting elements 30, are adapted to engage and slide along the side rails 32, 34 formed on each side of the groove 28.
As shown in Figure 2, an oil hole 36 is provided in the side of the guide bar and opens into the bottom of the groove 28. At the point with-in the groove where the oil hole enters, a depression is formed to provide an oil well 38. Immediately preceding the well 38 the bottom of the groove is raised to form a dam 40 which drops off sharply into the well 38. The side of the well opposite the dam 40 is inclined to provide a ramp 42.
In operation, oil is forced through the oil hole 36 and into the oil well 38. As the oil level is raised in the oil well, it is pushed along the ramp 42 and the dam 40 prevents spillage of the oil backward into the groove ;~ -and thus the oil is ejected onto the groove bottom in a forward direction. ~
The drive tangs 26 which carry bits of saw dust spilled into the bar groove ~ -28 will either deposit the saw dust in front of the dam 40J carry it over the oil well assisted by the flow of oil along the ramp ~2. The result is that saw dust ls less likel~ to fall into the well and block the oil 10w which ~lows up the ramp and into the path of the drive tangs.
~hereas the invention is not limited to the above described prefer- -red embodiment and because those skilled in the art, by following the teaching qf the above, will be able to make improvemen~s and changes without departing from the inventive concept, it is to be understood that the invention is encompassed b~ the claims appended hereto.
;, '
, '' ' ~L~455~9 which include cutting elements 30, are adapted to engage and slide along the side rails 32, 34 formed on each side of the groove 28.
As shown in Figure 2, an oil hole 36 is provided in the side of the guide bar and opens into the bottom of the groove 28. At the point with-in the groove where the oil hole enters, a depression is formed to provide an oil well 38. Immediately preceding the well 38 the bottom of the groove is raised to form a dam 40 which drops off sharply into the well 38. The side of the well opposite the dam 40 is inclined to provide a ramp 42.
In operation, oil is forced through the oil hole 36 and into the oil well 38. As the oil level is raised in the oil well, it is pushed along the ramp 42 and the dam 40 prevents spillage of the oil backward into the groove ;~ -and thus the oil is ejected onto the groove bottom in a forward direction. ~
The drive tangs 26 which carry bits of saw dust spilled into the bar groove ~ -28 will either deposit the saw dust in front of the dam 40J carry it over the oil well assisted by the flow of oil along the ramp ~2. The result is that saw dust ls less likel~ to fall into the well and block the oil 10w which ~lows up the ramp and into the path of the drive tangs.
~hereas the invention is not limited to the above described prefer- -red embodiment and because those skilled in the art, by following the teaching qf the above, will be able to make improvemen~s and changes without departing from the inventive concept, it is to be understood that the invention is encompassed b~ the claims appended hereto.
;, '
- 3 -`
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A guide bar for a chain saw including a groove along its edge for entraining the drive tangs of a saw chain, said guide bar comprising; a depression in the groove bottom forming an oil well, an oil conduit formed through a side of the bar and into the oil well for injecting oil into the oil well, said oil well having an inclined foward bottom wall forming a ramp for the oil to be forced forwardly into the path of the drive tangs.
2. A guide bar for a chain saw as defined in Claim 1 including a dam formed in the groove bottom immediately preceding the oil well to reduce the chance of saw dust spilling into the well and blocking the oil flow.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74936576A | 1976-12-10 | 1976-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045519A true CA1045519A (en) | 1979-01-02 |
Family
ID=25013441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA292,779A Expired CA1045519A (en) | 1976-12-10 | 1977-12-09 | Guide bar with saw chain oiling feature |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1045519A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5035057A (en) * | 1989-03-11 | 1991-07-30 | Heinrich Kesper | Chain guide for power chain saws |
| AU674278B2 (en) * | 1995-02-28 | 1996-12-12 | Andreas Stihl | Guide bar having an oil-feed channel |
| EP0894584A1 (en) * | 1997-06-30 | 1999-02-03 | Dolmar GmbH | Guide bar for the saw chain of a chainsaw |
| CN112453569A (en) * | 2020-12-11 | 2021-03-09 | 芜湖精锋园林机械科技有限公司 | Riveting tool for blade of chain of electric saw |
-
1977
- 1977-12-09 CA CA292,779A patent/CA1045519A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5035057A (en) * | 1989-03-11 | 1991-07-30 | Heinrich Kesper | Chain guide for power chain saws |
| AU674278B2 (en) * | 1995-02-28 | 1996-12-12 | Andreas Stihl | Guide bar having an oil-feed channel |
| EP0894584A1 (en) * | 1997-06-30 | 1999-02-03 | Dolmar GmbH | Guide bar for the saw chain of a chainsaw |
| CN112453569A (en) * | 2020-12-11 | 2021-03-09 | 芜湖精锋园林机械科技有限公司 | Riveting tool for blade of chain of electric saw |
| CN112453569B (en) * | 2020-12-11 | 2024-02-06 | 芜湖精锋园林机械科技有限公司 | Riveting tool for chain blade of electric saw |
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