CA1148069A - Miter box for portable power saw - Google Patents
Miter box for portable power sawInfo
- Publication number
- CA1148069A CA1148069A CA000375077A CA375077A CA1148069A CA 1148069 A CA1148069 A CA 1148069A CA 000375077 A CA000375077 A CA 000375077A CA 375077 A CA375077 A CA 375077A CA 1148069 A CA1148069 A CA 1148069A
- Authority
- CA
- Canada
- Prior art keywords
- base
- rigidly secured
- miter box
- fence
- guide rail
- 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
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
- B27G5/00—Machines or devices for working mitre joints with even abutting ends
- B27G5/02—Machines or devices for working mitre joints with even abutting ends for sawing mitre joints; Mitre boxes
- B27G5/023—Machines or devices for working mitre joints with even abutting ends for sawing mitre joints; Mitre boxes the mitre angle being adjusted by positioning a workpiece relative to a fixed saw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q9/00—Arrangements for supporting or guiding portable metal-working machines or apparatus
- B23Q9/0064—Portable machines cooperating with guide means not supported by the workpiece during working
- B23Q9/0078—Portable machines cooperating with guide means not supported by the workpiece during working the guide means being fixed to a support
- B23Q9/0092—Workpieces angularly adjustable relative to the support
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A miter box for a portable circular saw is disclosed, comprising a flat rectangular base and a pair of upraised, parallel and spaced-apart longitudinal guide rails. One of the guide rails is rigidly secured to the base while the other can be laterally adjusted.
A fence to align a board is provided. The former is pivotally secured to the base at one of its ends. An arcuate arm with a slot is rigidly attached to the fence on its non-contact side and is provided with lock means to lock the fence in a desired angular position in relation to the path of the saw.
A miter box for a portable circular saw is disclosed, comprising a flat rectangular base and a pair of upraised, parallel and spaced-apart longitudinal guide rails. One of the guide rails is rigidly secured to the base while the other can be laterally adjusted.
A fence to align a board is provided. The former is pivotally secured to the base at one of its ends. An arcuate arm with a slot is rigidly attached to the fence on its non-contact side and is provided with lock means to lock the fence in a desired angular position in relation to the path of the saw.
Description
-`` i148~69 FIELD OF THE INVENTION
~ The present invention relates to mitsr boxes, more partic-ularly to an improved miter bax adapted to provide guide means for a portable circular ssw.
SACKGRpUND OF THE INvENTION
Various miter deuices havb been proposed in the prior art.
For example, Canadian Patent 613,437 diecloses a guide means tor saws which is to be attached to a work bench. However, its construction is relatiuely complicated, having recourse to a cast-metal frame, a vertical pivot shaft and bearings, to mention only a ~ew of its elements. Another patent, U.S. 3~842,700, teaches ths use Or an upper and lower plate to sandwich the board or plank to be cut. While such a design may be ad-vantageous for certain shapes of wood, it is certainly not essential for the accurate sawing of wood.
Furthermore, as any amateur or professional carpenter knows, a board which is not supported on both sides of a kerf has a tendency to spl$nter at right angles to the ker~, especially on the bottom sur~ace o~ the board.
O~JECTS_OF THE INVENTION
Accordingly, it i8 a ~irst object o~ the present ~nvention - to provi~e a miter box which is very simple in design and which permits a worker to make an accUrato cut at any Or a variety ot anglea-It is an equally important object Or the pre~ent lnvention to provide a miter box which supports a board or piece of wood on both sides of the k0r~ to e~fectively prevent splintering. t SUM~ARY Of THE IN~ENTION
The abova and other ob~ects and advantages of the present inuention are realized according to a preferred embodiment compriaing a flat ba~e made Or suitable rigid material. ûne o~ the longitudinal edges o~ thi base ie provided with a first guide rail, the latter being spaced a certàin distance above the base to provide room for a piece of wood or board to be ~awed to pass thereunder. Upraising means are provided at both opposite ends of this ~irst guide rail to ... . ~
:
:
`` 1148~6g maintain the latter in ri~id raised position.
A second guide rail traverses the central portion of the base in parallel spaced-apart relationship to the first guide rail.
The second rail is also spaced above the base. Means are provided at both its opposite ends to move the second rail laterally, either towards or away from the first rail, but always in parallel relationship. The guide of a portable circular power saw slides on the two rails. Thus, the means dcscribed above constitute an adjustment means to accommodate the varying guide widths of circular saws of different makes.
lG A fence is pivotally secured at one of its ends to the base and is adapted to pivot through an arc of at least 60 degrees to properly align a board to be cut at a desired angle. The non-contact side of the fence is provided with àn~arcuate arm. This arm is in turn provided with lock means for securing the fence at a desired angle to the base.
Th¢ above will be more clearly understood by having referral to the preferred embodiment of the invention, illustrated by way of the accompanying drawings, in which:
ORIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspectiue view of the disclosed miter box, also showing in dashed outline a board in position to be sawed and a portable circular saw;
Figure 2 is a top plan view of the miter box also showing in dashed outline a board, and one limit position of the fence; and Figure 3 is a lateral elevation of the miter box, also showing a portable cirrular saw in daghed outline.
Like numerals refer to like elements throughout the drawings.
DETAILED DESCRIPTION OF THE PREFERRED EM~ODIMENT
The miter box 1 of the present invention includes a flat, 3n rigid and rectangular base 2 having a front longitudinal edge 3. A
block 4 is rigidly sscured to each of the two corners of the edge 3.
A first guide rail 5 is rigidly secured to the blocks 4 by screws 6, or otherwise,and extends longitudinally, spaced above base 2.
` :1148~69 A second guide rail 7 is provided~ extending in parallel spaced-apart relatiDnship to first rail 5 over~the central portion o~
base 2. This second rail 7 is movably secured to a pair of support members B. One of the latter is located on each lateral side of ba~e 2.
Lateral adjustment means ~ar rail 7 are included~ con-sisting of a downwardly-extending ~lange ~ rigidly secured to each end of rail 7. The lower portion of flanges 9 are each ~ormed with a laterally-extending slot 9'. A threaded stud 10 i8 rigidly secured to each ~upport member O and projects outwardly through its associated glot 9~.
Ooth first and second guide rails 5 and 7 are provided with mutually-facing shoulders 12 adapted to positively guids the flqt guide 13' of a portable circular saw 13~ as shown in Figure 1. It will be readily appreciated that the lateral adjustment means of second rail 7 is to accommodate variously-sized power saw-guide plates 13~.
Alignment means are also provided to properly align a board~
or plank 14. The means consists of a fence 15 piuotally secured to the base
~ The present invention relates to mitsr boxes, more partic-ularly to an improved miter bax adapted to provide guide means for a portable circular ssw.
SACKGRpUND OF THE INvENTION
Various miter deuices havb been proposed in the prior art.
For example, Canadian Patent 613,437 diecloses a guide means tor saws which is to be attached to a work bench. However, its construction is relatiuely complicated, having recourse to a cast-metal frame, a vertical pivot shaft and bearings, to mention only a ~ew of its elements. Another patent, U.S. 3~842,700, teaches ths use Or an upper and lower plate to sandwich the board or plank to be cut. While such a design may be ad-vantageous for certain shapes of wood, it is certainly not essential for the accurate sawing of wood.
Furthermore, as any amateur or professional carpenter knows, a board which is not supported on both sides of a kerf has a tendency to spl$nter at right angles to the ker~, especially on the bottom sur~ace o~ the board.
O~JECTS_OF THE INVENTION
Accordingly, it i8 a ~irst object o~ the present ~nvention - to provi~e a miter box which is very simple in design and which permits a worker to make an accUrato cut at any Or a variety ot anglea-It is an equally important object Or the pre~ent lnvention to provide a miter box which supports a board or piece of wood on both sides of the k0r~ to e~fectively prevent splintering. t SUM~ARY Of THE IN~ENTION
The abova and other ob~ects and advantages of the present inuention are realized according to a preferred embodiment compriaing a flat ba~e made Or suitable rigid material. ûne o~ the longitudinal edges o~ thi base ie provided with a first guide rail, the latter being spaced a certàin distance above the base to provide room for a piece of wood or board to be ~awed to pass thereunder. Upraising means are provided at both opposite ends of this ~irst guide rail to ... . ~
:
:
`` 1148~6g maintain the latter in ri~id raised position.
A second guide rail traverses the central portion of the base in parallel spaced-apart relationship to the first guide rail.
The second rail is also spaced above the base. Means are provided at both its opposite ends to move the second rail laterally, either towards or away from the first rail, but always in parallel relationship. The guide of a portable circular power saw slides on the two rails. Thus, the means dcscribed above constitute an adjustment means to accommodate the varying guide widths of circular saws of different makes.
lG A fence is pivotally secured at one of its ends to the base and is adapted to pivot through an arc of at least 60 degrees to properly align a board to be cut at a desired angle. The non-contact side of the fence is provided with àn~arcuate arm. This arm is in turn provided with lock means for securing the fence at a desired angle to the base.
Th¢ above will be more clearly understood by having referral to the preferred embodiment of the invention, illustrated by way of the accompanying drawings, in which:
ORIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspectiue view of the disclosed miter box, also showing in dashed outline a board in position to be sawed and a portable circular saw;
Figure 2 is a top plan view of the miter box also showing in dashed outline a board, and one limit position of the fence; and Figure 3 is a lateral elevation of the miter box, also showing a portable cirrular saw in daghed outline.
Like numerals refer to like elements throughout the drawings.
DETAILED DESCRIPTION OF THE PREFERRED EM~ODIMENT
The miter box 1 of the present invention includes a flat, 3n rigid and rectangular base 2 having a front longitudinal edge 3. A
block 4 is rigidly sscured to each of the two corners of the edge 3.
A first guide rail 5 is rigidly secured to the blocks 4 by screws 6, or otherwise,and extends longitudinally, spaced above base 2.
` :1148~69 A second guide rail 7 is provided~ extending in parallel spaced-apart relatiDnship to first rail 5 over~the central portion o~
base 2. This second rail 7 is movably secured to a pair of support members B. One of the latter is located on each lateral side of ba~e 2.
Lateral adjustment means ~ar rail 7 are included~ con-sisting of a downwardly-extending ~lange ~ rigidly secured to each end of rail 7. The lower portion of flanges 9 are each ~ormed with a laterally-extending slot 9'. A threaded stud 10 i8 rigidly secured to each ~upport member O and projects outwardly through its associated glot 9~.
Ooth first and second guide rails 5 and 7 are provided with mutually-facing shoulders 12 adapted to positively guids the flqt guide 13' of a portable circular saw 13~ as shown in Figure 1. It will be readily appreciated that the lateral adjustment means of second rail 7 is to accommodate variously-sized power saw-guide plates 13~.
Alignment means are also provided to properly align a board~
or plank 14. The means consists of a fence 15 piuotally secured to the base
2 at 20 and adapted to swing through an arc of at leafit 60 degree~, as indicated by the arrow in Figure 2. The non-contact side of rence 15 has an arcuate arm 16, which i8 provided with a guide slot 16~ ;
extending throughout its l~ngth. An upwardly-extending threaded peg 17 is ~ecured to base 2 and adapted to engage s~ot 16~. Another w~ng nut 1~ is provided to lock arm 16 and, hance~ fence 15 at a chosen angle.
The simple use of the miter box 1 is readily apparents firt the operator selects the proper distance between rails 5 and 7 by adjusting the position of rail 7. A circular saw 13 is th7n placed on the rails 5 and 7. Once fence 15 is locked at a specific angle, a board 14 is ~1id into position on base 2 and under rails 5 and 7. For the cutting, saw 13 is held with one hand and board 14 with the other hand. It will be appreciated that saw 13 may be moved in either longitudinal direction, as suggested by shallow grooves 19 made in base 2 by circular saw 20~ it being understood that t`he height of rails 5 and 7 above base 2 i8 such that saw 20 makes said grooves 19.
It is to be noted that a board 14 is supported on both sides 1~48~69 of thf` saw CUt to effectively eliminat~: splintering or chipping of the wood adjacent tl)e cut. It is also easy to use the ~roove 19 receiving saw 2û as a reference line for determining the line of cut in board 14.
~ 'hile the preferred embodiment has been specifically des-cribed, it is to be understood that minor modifications may be made without departinlJ from the spirit or scope of the invention.
.
extending throughout its l~ngth. An upwardly-extending threaded peg 17 is ~ecured to base 2 and adapted to engage s~ot 16~. Another w~ng nut 1~ is provided to lock arm 16 and, hance~ fence 15 at a chosen angle.
The simple use of the miter box 1 is readily apparents firt the operator selects the proper distance between rails 5 and 7 by adjusting the position of rail 7. A circular saw 13 is th7n placed on the rails 5 and 7. Once fence 15 is locked at a specific angle, a board 14 is ~1id into position on base 2 and under rails 5 and 7. For the cutting, saw 13 is held with one hand and board 14 with the other hand. It will be appreciated that saw 13 may be moved in either longitudinal direction, as suggested by shallow grooves 19 made in base 2 by circular saw 20~ it being understood that t`he height of rails 5 and 7 above base 2 i8 such that saw 20 makes said grooves 19.
It is to be noted that a board 14 is supported on both sides 1~48~69 of thf` saw CUt to effectively eliminat~: splintering or chipping of the wood adjacent tl)e cut. It is also easy to use the ~roove 19 receiving saw 2û as a reference line for determining the line of cut in board 14.
~ 'hile the preferred embodiment has been specifically des-cribed, it is to be understood that minor modifications may be made without departinlJ from the spirit or scope of the invention.
.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A miter box for portable circular saws, comprising a flat rigid base having a longitudinal edge; a first guide rail rigidly secured to said base and spaced upwardly therefrom by upraising means adjacent said longitudinal edge; a second guide rail extending in parallel spaced-apart relationship to said first guide rail; both said first and said second guide rails being provided with a mutually-facing shoulder whereby a portable circular saw may be guided thereon with the blade touching said base; further comprising a fence pivotally secured at one of its ends to said base; and positive alignment means to position and lock said fence in a desired angular position.
2. A miter box as claimed in claim 1, wherein said upraising means consists of a block rigidly secured to said base on each corner of said longitudinal edge; said first guide rail being rigidly secured to said blocks.
3. A miter box as claimed in claim 2, further including lateral adjustment means for said second guide rails.
4. A miter box as claimed in claim 3, wherein said lateral adjustment means consists of a pair of support members, one on each lateral side of said base; a downwardly-extending flange rigidly secured to each end of said second guide rail; said flange having a lower portion formed with a laterally-extending slot; a threaded stud rigidly secured to each said support member and projecting outwardly through its associated slot; a nut to positively lock each said flange in a desired position.
5. A miter box as claimed in claim 1, wherein said positive alignment means consists of an arcuate arm rigidly secured to the non-contact side of said fence; said arm being provided with a guide slot extending throughout its length; an upwardly-extending threaded peg rigidly secured to said base and adapted to engage said guide slot; and a lock nut screwable on said threaded peg to lock said arcuate arm in a desired angular position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000375077A CA1148069A (en) | 1981-04-09 | 1981-04-09 | Miter box for portable power saw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000375077A CA1148069A (en) | 1981-04-09 | 1981-04-09 | Miter box for portable power saw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148069A true CA1148069A (en) | 1983-06-14 |
Family
ID=4119694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375077A Expired CA1148069A (en) | 1981-04-09 | 1981-04-09 | Miter box for portable power saw |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1148069A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2821007A1 (en) * | 2001-02-22 | 2002-08-23 | Triomphe Jean Jacques Sapey | Cutting guide, for portable electric jigsaws or circular saws, uses base with raised edges carrying transverse guides which locate sole plate of saw and allow it to move across base |
| CN113547277A (en) * | 2021-07-29 | 2021-10-26 | 山东大学 | Flexible clamp system for car roof and using method thereof |
-
1981
- 1981-04-09 CA CA000375077A patent/CA1148069A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2821007A1 (en) * | 2001-02-22 | 2002-08-23 | Triomphe Jean Jacques Sapey | Cutting guide, for portable electric jigsaws or circular saws, uses base with raised edges carrying transverse guides which locate sole plate of saw and allow it to move across base |
| CN113547277A (en) * | 2021-07-29 | 2021-10-26 | 山东大学 | Flexible clamp system for car roof and using method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |