CA1266601A - Safety guard for portable power saws - Google Patents
Safety guard for portable power sawsInfo
- Publication number
- CA1266601A CA1266601A CA000493360A CA493360A CA1266601A CA 1266601 A CA1266601 A CA 1266601A CA 000493360 A CA000493360 A CA 000493360A CA 493360 A CA493360 A CA 493360A CA 1266601 A CA1266601 A CA 1266601A
- Authority
- CA
- Canada
- Prior art keywords
- shield
- safety guard
- frame
- saw
- securing
- 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
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
- B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
SAFETY GUARD FOR PORTABLE POWER SAWS
ABSTRACT OF THE DISCLOSURE
.
A safety guard which is adaptable for attachment to-the front handle bar of a chain saw or portable rotary cutter has a transparent curved shield of impact-resistant plastic and a supporting brace for mounting the shield to the front handlebar of the saw. The guard provides better protection for the operator against flying debris while not hindering visibility of the work piece or operation of the saw.
ABSTRACT OF THE DISCLOSURE
.
A safety guard which is adaptable for attachment to-the front handle bar of a chain saw or portable rotary cutter has a transparent curved shield of impact-resistant plastic and a supporting brace for mounting the shield to the front handlebar of the saw. The guard provides better protection for the operator against flying debris while not hindering visibility of the work piece or operation of the saw.
Description
SAFETY GUARD FOR PORTABLE POWER SAWS
BACKGROUND OF THE INVENTION
The invention relates to the field of safety guards for power tools and more particularly to safety guards for portable power tools such as chain saws and rotary cutters. Existing chain saws are frequently used in situations which result in flying debris such as chips, twigs and the like which can create a dangerous situation for the operator. Typically chain saw opera-tors will not wear safety goggles and flying debris gene-rated in the cutting of logs and underbrush or other applications can result in a risk of eye injury to the unprotected operator. Existing chain saws have no safety guard capable of deflecting flying debris away from the operator's face as this would impair the operator's visi-~0 bility of the work piece and the saw's cutting action.
Existing portable power saws are also used forcutting concrete, steel and other metals and similar durable materials. These are referred to as "cut-off saws" or "rotary cutters". These saws utilize a motor and frame construction which is virtually identical to that of a chain saw with the difference between the two saws being that in the case of the rotary cutter the chain drives a circular cutting disk, rather than carry-ing cutting teeth as in the chain saw. The rotary cutter is provided with a blade guard consisting of a thin sleeve over the top half of the blade, but otherwise such rotary cutters have no protection for the operator. The cutting operations in which rotary cutters are used gene-rate a good deal of dangerous flying debris and sparks.
:
3~2~ iV~
Again, operators often will not wear safety goggles when using rotary cutters, and accordingly there is a poten-tial risk of eye injury. Both rotary cutters and chain saws, due to their similar construction, utilize a front handlebar which the operator uses to carry the weight of the saw, while operating the controls with the other hand on the saw's handle.
There has therefore been a need for a safety guard or shield for portable rotary cutters and chain saws which can be installed easily on existing models and which does not impair the visibility of the operator or the operation of the saw.
SUMMARY OF THE INVENTION
The present invention provides a safety guard for chain saws and rotary cutters which comprises a shield of transparent, impact-resistant plastic which is preferably curved to deflect debris away from the operator. The shield is preferably provided with a slot to fit over the cutter bar of the chain saw or the drive chain of the rotary cutter. The safety guard is secured to the front handlebar of the saw by a supporting brace which may consist of a single C-shaped steel bar secured at both ~ends to the handlebar and secured by clamps along its central section to the shield.
BRIEF DESCRIPTION OF THE DRAWINGS
30An embodiment of the invention is illustrated in the accompanying drawings in which:
Figure 1 is a perspective view of the safety shield of the invention installed on a rotary cutter;
Figure 2 is a perspective view of the safety shield of the invention installed on a chain saw; and - : - : ~
., ~Z~66~
Figure 3 is a perspective view of the safety shield shown in Figure l removed from the saw.
Figure 4 is a perspective view of a safety shield of the invention designed for use on a chain saw.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figures l and 3, the safety guard of the invention 1 consists of a rectangular piece of trans-parent, impact-resistant plastic 2 which is curved to conform to the curvature of the circular blade 3 of the rotary cutter 4 as shown in Figure 1. A suitable plastic is LEXAN (which is a trade mark of Canadian General Electric Company Limited). PLEXIGLAS (a trade m~rk of the Rohm & Haas Company) is also a suitable plastic. The curvature of the shield directs and deflects sparks and flying debris away from the operator yet permits him to view the work piece. The shield has a cut-out 5 so that it fits over the drive mechanism 6 of the rotary cutter.
The shield is mounted on the front handlebar 7 of the saw by means of a mounting brace or support 9 which is a C-shaped steel bar having two extended arms 11 which are secured at ends 13 to the handle 7 by screws, adjustable metal straps or other means. The mounting brace can be formed for example of a cold-rolled steel bar, approxi-mately 5/16th inches in diameter.
The mounting support 9 is secured to the shield along its central section 15 by means of two clamps 17.
Clamps 17 are formed of two rectangular pieces of metal each provided with two holes for receiving two bolts.
One piece of metal has a rounded section to receive the steel bar which forms the central section of the suppor-ting brace. The other rectangular piece of metal bears against the opposite side of the shield. The shield is also provided with two holes in appropriate locations.
.... - .
~2666~)1 The two bolts are inserted through the pieces of the clamp and the shield and nuts are used to tighten the shield against the central section of the supporting bar.
In order to reduce the wear on the plastic from hot flying debris, a metal plate may be secured to the shield at location 19 by means of rivets or other means~
As shown in Figure 2, the guard of the invention may also be attached readily to a chain saw 21 -to protect the operator. Because of the similar construction of the handlebar for a chain saw, the safety guard of the inven-tion also readily fits onto the chain saw for securing to the front handlebar thereof. Cut-out 5 fits over the cutter bar 23 o~ the chain saw, and the shield is suppor-ted in front of the existing hand guard 25. As shown in Figure 4, a shield designed specifically for chain saws has less curvature than the shield designed for use with rotary cutters in order to avoid interference with the action of the chain saw when cutting large logs.
As will be apparent to those skilled in the art, various modifications of the structure disclosed herein may be made without departing from the spirit of the invention, which is to be interpreted in terms of the following claims. In particular, various other suppor-ting and bracing structures for securing the shield to the front handle bar will be apparent to those skilled in the art.
**********
,- ~
BACKGROUND OF THE INVENTION
The invention relates to the field of safety guards for power tools and more particularly to safety guards for portable power tools such as chain saws and rotary cutters. Existing chain saws are frequently used in situations which result in flying debris such as chips, twigs and the like which can create a dangerous situation for the operator. Typically chain saw opera-tors will not wear safety goggles and flying debris gene-rated in the cutting of logs and underbrush or other applications can result in a risk of eye injury to the unprotected operator. Existing chain saws have no safety guard capable of deflecting flying debris away from the operator's face as this would impair the operator's visi-~0 bility of the work piece and the saw's cutting action.
Existing portable power saws are also used forcutting concrete, steel and other metals and similar durable materials. These are referred to as "cut-off saws" or "rotary cutters". These saws utilize a motor and frame construction which is virtually identical to that of a chain saw with the difference between the two saws being that in the case of the rotary cutter the chain drives a circular cutting disk, rather than carry-ing cutting teeth as in the chain saw. The rotary cutter is provided with a blade guard consisting of a thin sleeve over the top half of the blade, but otherwise such rotary cutters have no protection for the operator. The cutting operations in which rotary cutters are used gene-rate a good deal of dangerous flying debris and sparks.
:
3~2~ iV~
Again, operators often will not wear safety goggles when using rotary cutters, and accordingly there is a poten-tial risk of eye injury. Both rotary cutters and chain saws, due to their similar construction, utilize a front handlebar which the operator uses to carry the weight of the saw, while operating the controls with the other hand on the saw's handle.
There has therefore been a need for a safety guard or shield for portable rotary cutters and chain saws which can be installed easily on existing models and which does not impair the visibility of the operator or the operation of the saw.
SUMMARY OF THE INVENTION
The present invention provides a safety guard for chain saws and rotary cutters which comprises a shield of transparent, impact-resistant plastic which is preferably curved to deflect debris away from the operator. The shield is preferably provided with a slot to fit over the cutter bar of the chain saw or the drive chain of the rotary cutter. The safety guard is secured to the front handlebar of the saw by a supporting brace which may consist of a single C-shaped steel bar secured at both ~ends to the handlebar and secured by clamps along its central section to the shield.
BRIEF DESCRIPTION OF THE DRAWINGS
30An embodiment of the invention is illustrated in the accompanying drawings in which:
Figure 1 is a perspective view of the safety shield of the invention installed on a rotary cutter;
Figure 2 is a perspective view of the safety shield of the invention installed on a chain saw; and - : - : ~
., ~Z~66~
Figure 3 is a perspective view of the safety shield shown in Figure l removed from the saw.
Figure 4 is a perspective view of a safety shield of the invention designed for use on a chain saw.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figures l and 3, the safety guard of the invention 1 consists of a rectangular piece of trans-parent, impact-resistant plastic 2 which is curved to conform to the curvature of the circular blade 3 of the rotary cutter 4 as shown in Figure 1. A suitable plastic is LEXAN (which is a trade mark of Canadian General Electric Company Limited). PLEXIGLAS (a trade m~rk of the Rohm & Haas Company) is also a suitable plastic. The curvature of the shield directs and deflects sparks and flying debris away from the operator yet permits him to view the work piece. The shield has a cut-out 5 so that it fits over the drive mechanism 6 of the rotary cutter.
The shield is mounted on the front handlebar 7 of the saw by means of a mounting brace or support 9 which is a C-shaped steel bar having two extended arms 11 which are secured at ends 13 to the handle 7 by screws, adjustable metal straps or other means. The mounting brace can be formed for example of a cold-rolled steel bar, approxi-mately 5/16th inches in diameter.
The mounting support 9 is secured to the shield along its central section 15 by means of two clamps 17.
Clamps 17 are formed of two rectangular pieces of metal each provided with two holes for receiving two bolts.
One piece of metal has a rounded section to receive the steel bar which forms the central section of the suppor-ting brace. The other rectangular piece of metal bears against the opposite side of the shield. The shield is also provided with two holes in appropriate locations.
.... - .
~2666~)1 The two bolts are inserted through the pieces of the clamp and the shield and nuts are used to tighten the shield against the central section of the supporting bar.
In order to reduce the wear on the plastic from hot flying debris, a metal plate may be secured to the shield at location 19 by means of rivets or other means~
As shown in Figure 2, the guard of the invention may also be attached readily to a chain saw 21 -to protect the operator. Because of the similar construction of the handlebar for a chain saw, the safety guard of the inven-tion also readily fits onto the chain saw for securing to the front handlebar thereof. Cut-out 5 fits over the cutter bar 23 o~ the chain saw, and the shield is suppor-ted in front of the existing hand guard 25. As shown in Figure 4, a shield designed specifically for chain saws has less curvature than the shield designed for use with rotary cutters in order to avoid interference with the action of the chain saw when cutting large logs.
As will be apparent to those skilled in the art, various modifications of the structure disclosed herein may be made without departing from the spirit of the invention, which is to be interpreted in terms of the following claims. In particular, various other suppor-ting and bracing structures for securing the shield to the front handle bar will be apparent to those skilled in the art.
**********
,- ~
Claims (7)
1. A safety guard for a portable power saw having a frame, a handlebar connected to said frame, a saw blade mounted for rotation on said frame, and an engine mounted in said frame for rotating said saw blade, comprising:
a) a shield of transparent, impact-resistant plastic having a broad surface extending laterally in the direction of the axis of rotation of said saw blade;
and b) means for securing said shield to said frame.
a) a shield of transparent, impact-resistant plastic having a broad surface extending laterally in the direction of the axis of rotation of said saw blade;
and b) means for securing said shield to said frame.
2.The safety guard of claim 1 wherein said means for securing said shield to said frame further comprises:
c) means for supporting said shield;
d) means for releasably securing said support means to said frame; and e) means for securing said support means to said shield.
c) means for supporting said shield;
d) means for releasably securing said support means to said frame; and e) means for securing said support means to said shield.
3. The safety guard of claim 2 wherein said support means are releasably secured to said handlebar.
4. The safety guard of claims 1, 2 or 3 wherein said surface of said shield is curved in a longitudinal direction perpendicu-lar to the axis of rotation of said saw blade.
5. The safety guard of claims 1, 2 or 3 wherein said shield is provided with an opening for receiving a cutter bar or drive chain of said power saw.
6. The safety guard of claim 3 wherein said means for relea-sably securing said support means to said handlebar comprises an adjustable strap.
Page 2 of Claims
Page 2 of Claims
7. The safety guard of claim 2 or 3 wherein said support means comprises a C-shaped bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000493360A CA1266601A (en) | 1985-10-18 | 1985-10-18 | Safety guard for portable power saws |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000493360A CA1266601A (en) | 1985-10-18 | 1985-10-18 | Safety guard for portable power saws |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1266601A true CA1266601A (en) | 1990-03-13 |
Family
ID=4131666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000493360A Expired - Fee Related CA1266601A (en) | 1985-10-18 | 1985-10-18 | Safety guard for portable power saws |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1266601A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010008328A1 (en) * | 2008-07-14 | 2010-01-21 | Husqvarna Ab | Hand guard for chainsaw |
| GB2455876B (en) * | 2007-12-19 | 2012-01-04 | Evolution Power Tools Ltd | Powered Mitre Saw |
| EP2412502A1 (en) * | 2010-07-30 | 2012-02-01 | HILTI Aktiengesellschaft | Circular saw |
-
1985
- 1985-10-18 CA CA000493360A patent/CA1266601A/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2455876B (en) * | 2007-12-19 | 2012-01-04 | Evolution Power Tools Ltd | Powered Mitre Saw |
| WO2010008328A1 (en) * | 2008-07-14 | 2010-01-21 | Husqvarna Ab | Hand guard for chainsaw |
| CN102089128A (en) * | 2008-07-14 | 2011-06-08 | 胡斯华纳有限公司 | Hand guard for chainsaw |
| US20140310965A1 (en) * | 2008-07-14 | 2014-10-23 | Husqvarna Ab | Hand guard for chainsaw |
| US8973276B2 (en) | 2008-07-14 | 2015-03-10 | Husqvarna Ab | Handguard for chainsaw |
| EP2412502A1 (en) * | 2010-07-30 | 2012-02-01 | HILTI Aktiengesellschaft | Circular saw |
| US10259061B2 (en) | 2010-07-30 | 2019-04-16 | Hilti Aktiengesellschaft | Circular saw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |