CN1282653A

CN1282653A - Mitre saw

Info

Publication number: CN1282653A
Application number: CN 00107095
Authority: CN
Inventors: 彼得·蔡科夫斯基
Original assignee: Black and Decker Inc
Current assignee: Black and Decker Inc
Priority date: 1999-07-28
Filing date: 2000-04-29
Publication date: 2001-02-07
Anticipated expiration: 2020-04-29
Also published as: CA2302032C; CA2302032A1; TWM245041U; CN1120769C

Abstract

In accordance with the present invention, an improved miter saw is employed. The miter saw includes a base assembly, a rotatable table rotatably connected to the base assembly, the table having a table plane, a fence connected to the base assembly and having a fence plane, a saw assembly including a motor and a blade driven by the motor, the blade having a radius and a blade center, and a pivot arm pivotally attached to the table and pivotally supporting the saw assembly about a first axis substantially parallel to the table plane, allowing a user to plunge the blade below the table plane, wherein the distance between the first axis and the table plane is about 0.472 times the radius. Also, the distance between the first axis and the fence plane is about 1.45 times the radius, and the distance between the first axis and the blade center is about 1.882 times the radius. In addition, the distance between the blade center and the table plane is about 0.57 times the radius when the blade is plunged below the table plane.

Description

Mitre saw

Mitre saw commonly used has a base assembly, it comprises that one is the panoramic table that is connected of revolution with base assembly, one has motor and by the saw componet of motor-driven saw blade, a pivoted arm that is pivotally connected to base assembly and supports saw componet, the user can make saw componet move towards and away from base assembly, so that cut workpiece.Mitre saw can be used for cutting cydariform moulded parts, wooden frame etc.

The cutting power of mitre saw is restricted because of its saw blade size and/or its geometry usually.For example, the most effective at present 10 inches nonslipping mitre saws can cut the wooden frame that is nominally 4 " * 4 " and 2 " * 6 ".Yet these mitre saws can not cut big plank; It as about full-size(d) six inches wide big plank.Therefore, want to cut plank greater than the mitre saw cutting power as the user, then the user just needs to buy and have big saw blade, heavier more expensive big mitre saw.Another way that substitutes is that the user adopts swing-arm type saw or slidingtype mitre saw.But this also needs more expense.

According to the present invention, adopt a kind of improved mitre saw.This mitre saw comprises a base assembly, one is revolution with base assembly and is connected and has the panoramic table on plane, one has motor and by the saw componet of motor-driven saw blade, and pivoted arm, this pivoted arm and panoramic table are pivotally connected, and the supporting saw componet, the user can make saw blade stretch into below the table top, wherein the following saw blade area of table top be the saw blade area 14.4% and 50% between.

Other features and advantages of the present invention from accompanying drawing and below be described in detail can be understood.

Accompanying drawing is that practical application in accordance with the principles of the present invention illustrates most preferred embodiment of the present invention.Wherein:

Fig. 1 is the perspective view according to mitre saw of the present invention;

Fig. 2 is the front view of mitre saw;

Fig. 3 is the top plane view along the mitre saw of III among Fig. 2-III line;

Fig. 4 is the left side view of mitre saw;

Fig. 5 is the right side view of mitre saw;

Fig. 6 is the right side view of the mitre saw of obliquity;

Fig. 7 represents the brake member that mitre saw uses.

With reference to accompanying drawing narration the present invention, wherein identical sign number shows identical part.With reference to Fig. 1～5, mitre saw 10 has base assembly 11, and assembly 11 preferably includes one and is the panoramic table 12 that is connected of revolution with base assembly 11, and this panoramic table can allow the user change the angle that saw blade is cut sth. askew as known systems.

In addition, this mitre saw 10 has the saw componet 30 of a saw blade 14 that has motor 17 (shown in broken lines) and driven by motor 17.Saw componet 30 is connected to base assembly 11 (and/or panoramic table 12) through arm 8 best pivotallies, and the user can make saw blade move towards panoramic table 12 when cutting action.Arm 8 can be connected with pivot joint 19, and this pivot joint 19 can make saw componet 30 around axle A rotation, causes saw componet 30 to be rotated down so that cut workpiece; And/or around sloping shaft B rotation, so that the inclination angle between change saw blade 14 and base assembly 11 and/or the panoramic table 12.

Motor 17 the most handy housings 16 cover.Handle 18 can be connected with housing 16, and handle 18 preferably has first a horizontal hand grip 18H that can allow the user be rotated down saw componet 30.In addition, handle 18 can have one can allow the user carry mitre saw 10 and second horizontal hand grip 18C first handle 18H perpendicular.

The guard assembly 20 that slides can be configured in the left side of mitre saw 10, and guard assembly 20 preferably is configured in the left side 11L of base assembly 11.The personnel that are familiar with prior art can be called the US Patent No 5,297,463 of " adjustable protection device that is used for composite inclined cutting saw " with reference to name, this patent at this in conjunction with reference.

The also configurable protector 21 on the right side of mitre saw, this protector 21 preferably is configured on the right side 11R of base assembly 11, best and guard assembly 20 coplanes.

Just as mentioned above, saw componet 30 rotates around axle A.Distance between the plane 11P of axle A and base assembly 11 and/or panoramic table 12 is distance A BP.This distance A BP is 0.472 times of saw blade 14 radius Rs preferably.In the saw blade radius was 10 inches mitre saws of 5 inches, distance A PB was about 2.36 inches.Equally, the distance between axle A and the plane 20P is distance A FP.This distance A FP is preferably about 1.45 times of radius R.Therefore, in 10 inches mitre saws, distance A FP is about 7.25 inches.

In addition, the distance between best axle A and the saw blade center BC; Be distance A BC; Be about 1.882 times of radius R, therefore, be about 9.41 inches at 10 inches mitre saw middle distance ABC.

In cutting operation process, more preferably, saw blade center BC reaches the location point of distance between saw blade center BC and the plane 11P; Promptly apart from BCBP; Be about 0.57 times of radius R, or in 10 inches are tiltedly sawed, be about 2.85 inches.

Person skilled in the art person can notice, so arranges to require saw blade 14 to stretch into plane 11P with the sizable part 14U of the next one.More preferably the area of position 14U be the saw blade gross area 14.4% and 50% between, it would be desirable it is 15.7% of the gross area at least.Therefore, for 10 inches saw blades with 50670.75 square millimeters of areas (the edge of a knife or spatial area between the blade teeth are not deducted), the area of part 14U should be between 7296.60 square millimeters and 25335.37 square millimeters (spatial area is not deducted between the blade teeth).The area of the pick of 14U is at least about 7984 square millimeters.

Person skilled in the art person thinks, adopts such arrangement, and panoramic table plane 11P and saw blade 14 intersect formation string CA.The length of string CA is 1.6 times of radius R at least.The length of string CA is at least 1.642 times of radius R, and promptly for 10 inches saw blade, chord length is at least 8.21 inches.If do not arrange

protector

20,21, this chord length will constitute cutting power.Therefore, cutting power will be the distance between string CA and the forward terminal that protects plane 20P, i.e. distance C C.Distance C C is at least 1.1 times of radius R preferably.For 10 inches saw blades, this distance C C preferably is at least 1.236-1.252 times of radius R, perhaps is at least the 6.18-6.26 inch.Concerning 10 inches saw blades, distance C C is 1.244 times of radius R or is about 6.22 inches.Ratio between distance C C and the chord length CA length also is desirable between being about 0.60 and 0.775, and it is 0.757 best that ratio is about.

Adopt such arrangement, 10 inches mitre saws can cut the wooden frame that is nominally 4 " * 4 " and 2 " * 6 ", as the most effective 10 inches fricton-tight mitre saws at present.In addition, 10 inches mitre saws with such arrangement, can cut 6 inches wide (full-size(d)s) and/or cut 5.25 inches wide logical plate (through board) with 31.62 ° of angles of chamfer with 0 ° of angle of chamfer, it be different from any existing 10 inches fricton-tight mitre saws.

With reference to Fig. 2-3 and 5, electric machine casing 16 when saw componet 30 is in minimum cutting position and 0 ° of angle of chamfer and inclination angle and plane 20P intersect (person skilled in the art person will appreciate that produce such result) because of above-mentioned arrangement.For fear of the contact between electric machine casing 16 and the protector 21, the protector 21 below housing 16 has at least a part to be provided with height H ＇, and this aspect ratio electric machine casing 16 is low.A part 21E of protector 21 preferably is provided at the height H place, and this part cans be compared to housing 16 height most, in order to support higher workpiece preferably.Therefore, this part 21E is configurable in the right of housing 16.

Such arrangement can make right protector 21 longer than the right protector of the most common mitre saw.According to common mitre saw design principle, protector 21 ends and sawing line 12K; Promptly intersect the line that is defined by plane 11P and saw blade 14; Between distance, roughly and the distance between sawing line 12K and the 11K end, right side; Promptly apart from KRS; Equate.Similarly, the distance between protector 20 ends and the sawing line 12R, roughly and the distance between sawing line 12K and the left side 11L; Promptly apart from KLS; Equate.Person skilled in the art person will appreciate that in the mitre saw with slip guard assembly, when the protector that slides slided into the position of close saw blade 14, this last principle was usually kept.

In addition, normally equate apart from KLS with distance KRS.Similarly, the distance between protector 21 ends and the sawing line 12K, normally with protector 20 ends and sawing line 12K between distance equate.Person skilled in the art person will recognize that in the mitre saw with slip guard assembly, when the slip guard assembly slided into the position of close saw blade 14, this principle was usually kept.

Therefore, if adopt the design principle of prior art, longer because of protector 21 and/or right side 11R, and left side 11L and/or protector 20 will be longer.Thereby preferably dispose a kind of apart from the KRS ratio base assembly 11 big apart from KLS.Distance between same preferably protector 21 ends and the sawing line 12K is than the distance between protector 20 ends and the sawing line 12K.If mitre saw disposes the guard assembly of slip, then when protector 20 slided into the position of close saw blade 14, the distance between protector 21 ends and the sawing line 12K can be bigger than the distance between protector 20 ends and the sawing line 12K.In other words, more preferably greater than 1: 1, should be 1.06: 1 apart from the ratio between KRS and the KLS at least.10 inches mitre saws for making in view of the above can be about 267 millimeters and 251 millimeters respectively apart from KRS and KLS.

In Fig. 3-7, another aspect of the present invention has been shown.Mitre saw preferably disposes an arrestment mechanism 50.Arrestment mechanism 50 can comprise a movably brake 53 that is connected with saw componet 30, and this brake preferably is connected with arm 8.In addition, arrestment mechanism 50 can have a fixing brake 51, this fixedly brake 51 be configured on the base assembly 11, preferably be configured on the panoramic table 12.When saw componet 30 rotated in dissection, movably brake 53 contacted fixedly brake 51, any further rotation of restriction saw componet 30.

Fixedly brake 51 has a surperficial 51S who is used to contact mobile brake 53, and this surface 51S preferably can " follow procedure work ", so that change the cutting movement scope of saw componet 30 under the differing tilt angles situation.For example, when saw componet 30 is in 0 ° of angle of inclination (as shown in Figure 5), it can provide complete cutting movement scope.And when saw componet 30 was in 45 ° of angles of inclination, it can limit the cutting movement scope.Person skilled in the art person will appreciate that, when saw componet 30 is rotated down during at 45 ° of angles of inclination, for fear of the contact between protector 20 and the following blade guard 15, such result is desirable.In addition, be desirable for obtaining the less such result of cutting power CC.Therefore, by disposing suitable surperficial 51S, fixedly brake 51 energy follow procedure work are to obtain such result, as shown in Figure 7.

Person skilled in the art person will appreciate that, surperficial 51S can follow procedure work to obtain different results.For example, but the work of surperficial 51S follow procedure is restricted to the height that increases protector 20 and in the cutting movement scope of other obliquity.

Person skilled in the art person can make other replacement to the device of being narrated.Yet equivalent of the present invention is all thought in all these increases and/or replacement.

Claims

1. mitre saw, it comprises:

A base assembly;

One is the panoramic table that is connected of revolution with base assembly, and this panoramic table has a plane;

One is equipped with motor and by the saw componet of motor-driven saw blade; With

A pivoted arm, this pivoted arm are pivotally connected to panoramic table and support saw componet, and the user can make saw blade stretch into below the table top;

Wherein, saw blade stretch into table top when following the following saw blade area of table top be about the saw blade gross area 14.4% and 50% between.

2. according to the mitre saw of claim 1, wherein the saw blade area below table top is about 15.75% of the saw blade gross area.

3. according to the mitre saw of claim 1, wherein also comprise a slip protector that is connected with base assembly.

4. mitre saw, it comprises

A base assembly;

One is the panoramic table that is connected of revolution with base assembly, and this panoramic table has a table top;

A protector that is connected and has the protection plane with base assembly;

One is equipped with motor and by the saw componet of motor-driven saw blade, this saw blade has a radius and saw blade center; With

A pivoted arm, this pivoted arm is pivotally connected to panoramic table, and saw componet around first parallel with the revolution table top basically swivel bearing, and the user can make saw blade stretch into below the revolution table top;

Wherein, first and the distance of revolution between the table top are about 0.472 times of saw blade radius, and the distance between first and the protector plane is about 1.45 times of saw blade radius, and the distance between first and the saw blade center is about 1.882 times of saw blade radius.

5. according to the mitre saw of claim 4, wherein stretched into the revolution table top when following at saw blade, the distance between saw blade center and the revolution table top is about 0.57 times of saw blade radius.

6. according to the mitre saw of claim 4, the chord length that wherein stretches into the following saw blade circumference of revolution table top is at least 1.6 times of saw blade radius.

7. according to the mitre saw of claim 4, the string that wherein stretches into the following saw blade circumference of revolution table top has first end points behind protector, second end points is arranged before protector, and the distance between the protector and second end points is at least 1.1 times of saw blade radius.

8. according to the mitre saw of claim 7, wherein the distance between the protector and second end points is at least about 1.236 to 1.252 times of saw blade radius.

9. according to the mitre saw of claim 7, wherein the distance between the protector and second end points is at least 1.244 times of saw blade radius.

10. according to the mitre saw of claim 7, wherein the distance between the protector and second end points is between 0.60 and 0.775 times of chord length.

11. according to the mitre saw of claim 7, wherein the distance between the protector and second end points is about 0.757 times of chord length.