CN1075425C - Riving knife - Google Patents
Riving knife Download PDFInfo
- Publication number
- CN1075425C CN1075425C CN96123498A CN96123498A CN1075425C CN 1075425 C CN1075425 C CN 1075425C CN 96123498 A CN96123498 A CN 96123498A CN 96123498 A CN96123498 A CN 96123498A CN 1075425 C CN1075425 C CN 1075425C
- Authority
- CN
- China
- Prior art keywords
- blade
- riving knife
- saw
- workbench
- saw blade
- 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
- B27G19/08—Accessories for keeping open the saw kerf, e.g. riving knives or wedge plates
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Knives (AREA)
Abstract
A riving knife (1) is mounted externally of a circular saw machine such that a curved leading edge of a blade (5) of the riving knife is close to and generally conforms to the arc described by the rim of the saw blade. The blade (1) has a gantry part (8) extending from a mounting part (3) and arranged to be disposed above the level of a saw table (2) when the knife is mounted, a blade part (5) depends from said gantry part towards said table in the shape of a tapering finger. The position of the blade part (5) in the plane of rotation of the saw blade and with respect to said table can be manually adjusted to permit a curved leading edge of the blade part to be disposed proximate the arc described by the rim of the saw blade.
Description
The present invention relates to a kind of riving knife or separator that is used for bench saw, particularly relate to a kind of adjustable riving knife that is used for circular bench saw.
As everyone knows, using a riving knife on circular bench saw is to abut against on the blade for the wood that prevents to be cut.Riving knife has a blade usually, and the wheel rim of the leading edge of this blade and circular saw blade adapts.For the workpiece that advances, the blade of riving is positioned at the back of saw blade, and when saw blade is in a fixed position, and the blade of riving is general radially round the wheel rim of saw blade.
Fig. 1 has shown the riving knife 1 of a prior art, and this cutter is installed in the outside of saw by a carriage that does not have to show, this carriage is positioned under the plane of workbench or table 2.This cutter 1 has an installation portion 3, and this installation portion has a groove 4 of admitting bolt, so that this cutter is fixed on the said carriage.Installation portion 3 extends above Working table 2.The blade portion 5 adjacent with said installation portion 3 has a leading edge, and the edge of its shape and circular saw blade is similar.A protective blade device can be fixed on the cutter 1 by a protective blade device fixing hole 6.In addition, anti-recoil rod can be connected in the either side of cutter 1 by fixing point 7.This anti-recoil rod is coupled with elastic load, make its with workpiece to pressing down.Hold a spacer pin (not showing) in the hole 10 on riving knife, this spacer pin stops anti-recoil rod to turn over a predetermined point.
Notice that the riving knife among Fig. 1 extends above the formed arc of circular saw blade wheel rim.Such riving knife just can not be used for forming less than the complete dark otch of workpiece.
Desk-top circular saw equipment generally includes a workbench that is supported on framework or the body.This body holds the saw equipment that is supported under the table plane, and this body also comprises a motor component and cutter shaft mechanism, and this cutter shaft is used to move up and down the circular saw blade.Cutter shaft mechanism generally can also make the different relatively cutting planes of saw blade tilt.Move to allow carrying out a small amount of on cutting planes so be provided with groove 4, when tilting in mechanism like this, riving knife just can not hindered by Working table.Yet importantly saw blade is when all positions, and riving knife extends downward the Working table surface, and workpiece just can not be close to after saw blade like this.
The saw blade hole that this circular saw blade passes a workbench extends out for 2 times from workbench, is promoted or is put down saw blade and regulate depth of cut by cutter shaft mechanism.Though the general saw blade that uses a given radius of most workbench to reach optimum condition, is for example used 10 inches saw blade, the degree of depth of cutting also can change by replacing with the saw blade of different radii.
Along with the development of European standard in this area, the present distance that requires to make the wheel rim of circular saw blade and rive between the blade leading edge remains in the predetermined limit.Can see that from the riving knife of Fig. 1 the distance between blade and the saw blade is along with the increase of depth of cut and minimizing and change.In addition, clearly, along with the change of depth of cut, riving knife shown in Figure 1 can not make the distance between blade edge and the saw break bar edge keep constant.In addition, any motion of leaving workbench of riving knife in saw cutter plane will be stayed next gap (Y) between the bottom of the workbench and the blade of riving, and this will be harmful to the operation of riving of riving knife.
Having known to provide a riving knife in cutter shaft mechanism, this cutter shaft is in the body of desk-top circular saw, and this circular saw is contained on its pedestal, and extends upward by the prolongation in saw hole.Riving knife and saw blade together rise or fall like this, and keep a constant radial distance between saw edge and blade.Even the edge of this blade is not consistent with the wheel rim of saw blade, the ultimate range between them still can keep.In the blade position of blade position and the outer riving knife of installing of the riving knife installed some is different a little, this is that size owing to blade can make it not stretch out above the described circular arc of the wheel rim of circular saw blade.Like this, just may on workpiece, cut out the otch of a degree of depth with the circular saw equipment that comprises the riving knife of installing in less than thickness of workpiece.
Install in adopting and the outer riving knife of installing, make the leading edge of blade be in position, and the concentric circular shape of employing and saw blade wheel rim is ideal near the wheel rim of saw blade.New European standard requires more than the saw workbench, the distance between the saw blade wheel rim of riving knife and dentation under arbitrary situation of depth of cut all not above 5 millimeters.
Therefore, proposed with a kind of can self-adjusting riving knife in the annular saw body, promptly be mounted to the aforesaid riving knife that can rise, descend and replace the outer riving knife that is installed on the body according to Fig. 1 with saw blade.In order to replace the outer riving knife of installing, must prolong the saw hole on the machine so that hold the blade of the riving knife of automatic and adjustable with riving knife that install, automatic and adjustable in a kind of.In addition, also need some extra parts that riving knife is installed.This riving knife will be called as interior riving knife in aftermentioned.This term has comprised that all are installed in the body or the riving knife in the framework of miter saw.Other cutter, as be installed in riving knife on workbench or the body will be called as outer riving knife, for example, and as shown in Figure 1 the sort of.In this manual, saw blade of being referred to or circular saw comprise band tooth or not toothed blade type saw, for example a friction cutting disc.
The objective of the invention is to for desk-top saw provides a kind of riving knife, this cutter can be adjusted so that keep ultimate range between its blade and the circular saw blade wheel rim, and can be easy to and adapt to existing circular saw designs very cheaply.
Therefore, the invention provides a kind of bench saw riving knife, this cutter is suitable for being installed at home and abroad on the table saw body at the Plane of rotation of desk-top saw blade, and cutter comprises an installation portion; A crossbearer portion, this crossbearer portion is from said installation portion extension and be configured on the buck surface when loading onto this riving knife; Blade section is left said crossbearer portion and is extended towards said workbench.This riving knife is configured to the position of its blade portion in the Plane of rotation of saw blade, but and adjust with respect to said workbench artificially, so that in effective cutting-height scope of whole saw blade, make the wheel rim determined circular arc of the leading edge of blade portion bending near saw blade.
Cutter of the present invention can be used as the substitute that riving knife is installed outside the fixed position and is installed on the desk-top saw, and does not need from redesigning workbench or body in essence.Cutter of the present invention allows the height of artificial adjustment blade so that keep a fixing or maximum distance between blade leading edge and the circular saw wheel rim, promptly on the arbitrary radius of bench saw wheel rim, the distance between saw wheel edge and the blade can remain in the fixing scope.
This blade portion can be left said crossbearer towards the tapered pointer shape of workbench form with one.Therefore, have a hole between blade and installation portion, this Kong Zhongke holds a part of Working table, and like this, a part of blade just can extend to below the workbench surface by the saw blade hole.The blade of riving knife is extended to below the workbench, perhaps arrive the table face at least.Its strong point is in the whole working range of saw, and the blade of riving knife adapts with the wheel rim of saw blade basically, and provides the operation of riving on whole depth of cut.Being preferably the radial distance that makes the saw wheel edge and rive between the blade is adjusted upward to below 5 millimeters in depth of cut side.
In one embodiment, there is a slot mounting portion in a zone of cutter, this hole can hold two bolts, can for example with nut this riving knife be fixed on the carriage with any lock mode, and adopting two bolts is in order to prevent the rotation of riving knife.
The present invention also provides the desk-top saw equipment that comprises riving knife of the present invention.
The present invention also provides the desk-top saw equipment that comprises a workbench, and a saw blade hole is arranged on this workbench; Also comprise a body that is supporting workbench; A motor component that is used to drive blade, these parts are mounted and are supported under the surface of workbench; The device of riving knife is installed at said body; Have blade portion and with the riving knife of said erecting device mating part; And adjusting device.By this adjusting device, the position that is in the blade portion in the saw blade Plane of rotation can the artificially adjustment, make have a crooked leading edge blade portion on the working depth of whole saw blade near the determined circular arc of saw blade wheel rim.
This riving knife can have the installation portion and the crossbearer portion that comprise said erecting device, and this crossbearer portion extends and is configured in more than the plane of workbench from said installation portion.This blade portion is left said crossbearer portion, and it is shaped as one towards the tapered pointer shape of said workbench.
This erecting device and the device that is mated can comprise said adjusting device.
The device that matches with said erecting device comprises an elongated hole on said installation portion.
One embodiment of the present of invention will only also be described with the form of example with reference to the accompanying drawings, wherein:
Fig. 1 is a side view that is installed in the riving knife of the prior art on the circular saw Working table;
Fig. 2 is a side view according to riving knife of the present invention;
Referring to Fig. 1, it has shown the outer installation riving knife 1 of a prior art, and this riving knife has blade 5.This riving knife 1 is installed on the carriage (not showing), and this carriage is supported by a bar, and this bar extends in the body of saw device, and fixes with a carriage that is supporting the electrical components of saw.This riving knife is installed by two bolts, and this bolt is passed in the groove 4 on the installation portion 3.This carriage below the plane of workbench, so just can not hinder passing through of workpiece usually.Using two bolts is in order to prevent the rotation of riving knife in the Plane of rotation of saw blade.
Adopt this design, front end at machine provides manually-operated device (not showing), be used for making saw blade 9 (shown in Figure 2) to tilt, by around an axle rotating motor, saw blade 9 and riving knife are rotated around same axis, thus make they be maintained fixed in known manner the combination and achieve the goal.Groove 4 allows riving knife to move on a small quantity, can make the cleavage inclination like this and not touch the workbench surface.Yet this riving knife all is fixing riving knife.
From Fig. 1 as seen, if saw blade rises (being that depth of cut increases) with respect to workbench 2, the saw blade wheel rim will be near the blade 5 of riving.On the contrary, if depth of cut reduces, then the saw blade and the distance of riving between the blade 5 increase.Therefore, adopt this design can not adjust the position of riving knife, thereby in the whole working range of saw blade, keep saw blade and rive distance between the blade in a predetermined scope.
According to riving knife of the present invention as shown in Figure 2.In Fig. 2, the part identical with Fig. 1 all gives the reference number identical with Fig. 1.
Riving knife shown in Figure 2 can alternate figures 1 riving knife, and do not need the workbench of saw is made an amendment.Can riving knife be installed on the machine with identical carriage, be about to it and be fixed by bolts on the bar, this bar links to each other with motor bracket.Yet embodiment as shown in Figure 2 of the present invention is not the groove 4 with Fig. 1, but elongated groove 4 a are provided in installation portion, and this groove permission adjustment riving knife stretches out the height on the workbench surface.
Mode described in conjunction with Figure 1, cutter 1 is stretched more than table plane, and last top is provided, and in this embodiment, has the fixing hole 7 and the protective blade device fixing hole 6 of an anti-recoil rod.Anti-recoil rod is shown in the dotted line of Fig. 2.Also have a hole 10, be used for adorning the spacer pin of anti-recoil rod.
Riving knife as shown in Figure 2 has a blade 5, and this blade is 2 extensions downwards from crossbearer portion 8 towards workbench.This blade 5 is tapered towards workbench.Formed a chopper hole in this way between the blade section of riving knife and installation portion 3, this hole is shown as X usually.The size of this blade aperture and shape are convenient to admit the edge of workbench 2.In this way, when riving knife was in some position, the part of the lower end of blade 5 can be passed the saw blade hole and be reached below the table plane.When these positions, saw blade 9 is indentations, and the degree of depth of saw blade on workbench reduces like this, thereby has enough spaces to admit the end of the blade of riving in the saw blade hole.
As shown in Figure 1, the riving knife of prior art can rise slightly by bolt 4, so that allow the relative saw blade of riving knife to tilt.Yet,, just formed a gap in this blade bottom and Working table surface if the blade of riving of prior art is raised.This gap is represented as Y usually.
The present invention can replace the outer installation riving knife of prior art, and this new riving knife adapts to desired European standard, and the radial distance between the leading edge of saw wheel edge and this blade is remained in the predetermined scope, for example, and below 5 millimeters.This adjustment is manually-operated, and adjusting device is easy to touch for the user of machine, because it is beyond body.The replacement of riving knife does not need to redesign any other part except riving knife itself, and without any need for new part this riving knife is installed.On the contrary, need redesign workbench when riving knife is replaced the outer installation riving knife of prior art, holding this riving knife, and need its erecting device of redesign with installing in one.
Can notice that when saw blade was in maximum depth of cut position, this saw blade almost was full of the saw hole in the workbench.Yet when saw blade was in position less than maximum depth of cut, the distance between saw blade wheel rim and the saw blade bore edges was bigger.Because riving knife of the present invention minimum narrowlyer is wedge-like to its highest broad place from it, thereby when maximum depth of cut position almost, the narrower end of riving knife just can enter the space that is not occupied by saw blade in the saw blade hole.Return when reducing depth of cut when saw blade, the bigger width of riving knife can be housed inside in the saw blade hole.The riving knife of traditional interior installation is not like this, and narrow base is compared in its end.
When describing embodiments of the invention, for a person skilled in the art various modifications can be arranged, these modifications all belong to by the determined scope of claims.For example, riving knife of the present invention can be installed with any method easily.And saw blade can be a cutting disc.
Claims (6)
1. one kind is suitable for being installed in bench saw riving knife on the table saw body at home and abroad at desk-top saw blade Plane of rotation, this riving knife comprises an installation portion, a crossbearer portion, and this crossbearer portion extends and is configured in when riving knife is loaded onto from described installation portion and saws on the workbench surface; Also comprise a blade portion, this blade portion is left described crossbearer portion and is extended towards described workbench, this riving knife is configuration like this, be blade portion in the saw blade Plane of rotation the position and can manually adjust with respect to the position of described workbench so that the leading edge that makes this blade portion bending in whole effective cutting-height scope of saw blade near the determined circular arc of wheel rim of saw blade; Wherein, blade portion is left crossbearer portion with the pointer shape form that attenuates towards workbench, and blade portion and installation portion separate along crossbearer portion, it is characterized in that a hole is arranged between blade portion and installation portion, and this Kong Zhongke holds a part of workbench.
2. bench saw riving knife according to claim 1 is characterized in that, blade portion is mounted and is used for all extending to the plane of this workbench or extend under this plane on all positions of riving knife.
3. a desk-top saw equipment comprises the riving knife described in a claim 1 or 2.
4. desk-top saw equipment, comprise a workbench with saw blade hole, a body that is supporting this workbench, also comprise a motor component that is used to drive blade, these parts are mounted and are supported on below the workbench surface, riving knife is installed in device on the described body, the riving knife of a device that has blade portion and match with described erecting device and an adjusting device outward; Wherein, the position of the blade portion in the saw blade Plane of rotation can be by manually adjusting, so that make blade portion with the close determined circular arc of saw blade wheel rim of its crooked leading edge in the whole operation altitude range of saw blade; Described riving knife comprises an installation portion and a crossbearer portion, this installation portion comprises the device that matches with described erecting device, this crossbearer portion extends and is on the plane of workbench from described installation portion, the blade portion of described riving knife is to leave crossbearer portion towards the tapered pointer shape of workbench form, blade portion and installation portion separate along crossbearer portion, it is characterized in that a hole is arranged between blade portion and installation portion, this Kong Zhongke holds a part of workbench.
5. according to the desk-top saw equipment of claim 4, it is characterized in that on whole positions of riving knife, blade portion extends to table plane or below the table plane.
6. according to the desk-top saw equipment of claim 4 or 5, it is characterized in that described erecting device and the device that matches with it comprise described adjusting device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9524550A GB2307443B (en) | 1995-11-24 | 1995-11-24 | Riving knife |
| GB9524550.2 | 1995-11-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1159971A CN1159971A (en) | 1997-09-24 |
| CN1075425C true CN1075425C (en) | 2001-11-28 |
Family
ID=10784731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96123498A Expired - Fee Related CN1075425C (en) | 1995-11-24 | 1996-11-22 | Riving knife |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1075425C (en) |
| GB (1) | GB2307443B (en) |
| HK (1) | HK1013274A1 (en) |
| TW (1) | TW350811B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104741694A (en) * | 2013-12-26 | 2015-07-01 | 苏州宝时得电动工具有限公司 | Multifunctional bench saw |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB221671A (en) * | 1923-10-22 | 1924-09-18 | George Scattergood | Improvements in or relating to guards for circular saws |
| GB605210A (en) * | 1945-07-18 | 1948-07-19 | Walker Turner Co Inc | Saw guard |
| DE2364910A1 (en) * | 1973-12-28 | 1975-07-03 | Elektra Beckum Lubitz & Co | Height-adjustable circular-saw splitting-wedge holder - with lowering-plate on swivelling mounting carry holder to swivel by parallelogram control |
| US4615247A (en) * | 1985-09-13 | 1986-10-07 | Shopsmith, Inc. | Anti-kickback system |
-
1995
- 1995-11-24 GB GB9524550A patent/GB2307443B/en not_active Expired - Fee Related
- 1995-12-09 TW TW084113139A patent/TW350811B/en active
-
1996
- 1996-11-22 CN CN96123498A patent/CN1075425C/en not_active Expired - Fee Related
-
1998
- 1998-12-22 HK HK98114614A patent/HK1013274A1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB221671A (en) * | 1923-10-22 | 1924-09-18 | George Scattergood | Improvements in or relating to guards for circular saws |
| GB605210A (en) * | 1945-07-18 | 1948-07-19 | Walker Turner Co Inc | Saw guard |
| DE2364910A1 (en) * | 1973-12-28 | 1975-07-03 | Elektra Beckum Lubitz & Co | Height-adjustable circular-saw splitting-wedge holder - with lowering-plate on swivelling mounting carry holder to swivel by parallelogram control |
| US4615247A (en) * | 1985-09-13 | 1986-10-07 | Shopsmith, Inc. | Anti-kickback system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9524550D0 (en) | 1996-01-31 |
| GB2307443A (en) | 1997-05-28 |
| CN1159971A (en) | 1997-09-24 |
| HK1013274A1 (en) | 1999-08-20 |
| TW350811B (en) | 1999-01-21 |
| GB2307443B (en) | 1999-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1064574C (en) | Balde and motor carrier with height/angle adjustment mechanism | |
| CN1027744C (en) | Vertical band saw | |
| US5724875A (en) | Guard and control apparatuses for sliding compound miter saw | |
| CA2814600C (en) | Improved tooth for circular saw or mower drum | |
| US20020020266A1 (en) | Apparatus for controlling work feed rate for cutting wood, metal and other materials | |
| US6971297B1 (en) | Guard and control apparatuses for sliding compound miter saw | |
| US6182548B1 (en) | Guard and control apparatuses for sliding compound miter saw | |
| US5355635A (en) | Power-driven cut-off machine | |
| US5271155A (en) | Hand circular saw | |
| CN1490108A (en) | Dust collector for mistre saw | |
| CN1075425C (en) | Riving knife | |
| CN109531705A (en) | Automatic material cutter for waddy processing | |
| US2903027A (en) | Blade tracking and guiding mechanism for band saw construction | |
| CN114434557A (en) | Blade guide with trunnion | |
| EP0891241B1 (en) | Guard and control apparatuses for sliding compound miter saw | |
| CN85108645A (en) | Disc cutter is especially for the disc cutter of cutting beet | |
| CA2035763C (en) | Adaptable tool-holder assembly for robitized adjustment | |
| US5253686A (en) | Process and device for separating or slitting a rigid material | |
| CN1115222C (en) | Milling tool | |
| US4252163A (en) | Wood-planing and finishing machine | |
| US7121488B1 (en) | Spring assist assembly for infeed pan of wood chipper | |
| CN1077820C (en) | Guard and control apparatus for sliding compound miter saw | |
| CN210361531U (en) | Knife roller and chopping device with same | |
| US20060101968A1 (en) | Table saw trunnion system | |
| CN1111462C (en) | Improved narrow saw blade machine saw |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |