JPH0532241Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a portable circular saw that is used for cutting, tenoning, etc. of wood.

(Prior art) As a conventional technology, there is, for example, Japanese Utility Model Application Publication No. 53-24592.

This publication includes two grip parts, an X part and a Y part, and a
A swing saw type portable cutting machine is disclosed which has two switches and is capable of moving forward and backward.

(Problem to be solved by the invention) In the portable cutting machine disclosed in the above publication, when working by moving the cutting machine in the horizontal direction, the 8th
As shown in Figures 9 and 9, regardless of whether the cutting machine is moving in the c or d direction, extend your hand from diagonally above and grasp the X or Y part of the handle 1X, and use the gripped hand to operate the switch 3X. However, when working by moving the cutting machine in the vertical direction (direction e), it is necessary to grasp the Y section of the handle 3X as shown in Fig. 10 in order to comfortably grasp the handle 1X. There is a problem in that the switch 3X cannot be operated with the index finger of the hand that grips the handle 1X. Also, if you try to operate the switch with the index finger of the hand that grips the handle 1X,
As shown in the figure, it is necessary to extend your hand diagonally from below and grasp the X part of handle 1X, so handle 1
There is a problem in that the shape of the hand holding the X becomes unnatural and it is necessary to work in an unreasonable working posture, making it impossible to work at a low position.

Additionally, if you grip the handle in an unnatural way,
Since the balance between the force of gripping the handle and the force of propelling the handle is lost, the circular saw blade vibrates abnormally and the handle cannot be propelled accurately.

The object of the present invention is to solve the above problems.

(Means for Solving the Problems) The present invention includes a motor housing installed on a base, a motor housed in the motor housing, a circular saw blade rotationally driven by the motor, and the base. In a portable circular saw, the handle has an inclination angle relative to the horizontal plane when the base is horizontal, and an inclination angle relative to the horizontal plane when the base is vertical. A grip part is formed that is inclined so that the angles are approximately equal to each other, and the inner side near both ends of this grip part is used for turning on and off the switch inserted in the handle with the index finger of the hand gripping the grip part. Alternatively operated1
It has a configuration with a pair of triggers attached.

(Function) The grip portion of the handle is tilted so that the angle of inclination of the grip portion with respect to the horizontal plane when the base is horizontal is approximately equal to the angle of inclination of the grip portion with respect to the horizontal plane when the base is vertical. When moving the circular saw in the horizontal and vertical directions, the grip can be gripped comfortably with the forward and reverse hands. When gripping the unit with your normal hand or with your reverse hand, operate the trigger on the index finger side of the gripping hand to turn the switch on and off.

(Example) Next, a first example of the present invention will be described with reference to FIGS. 1 to 6.

A motor housing 3 housing a motor 4 is installed on the base 2 of the tool body 1, and at the front of the motor housing 3, the upper and lower parts of the cutting edge of a circular saw blade 5, which is rotationally driven by the motor 4, are installed. A blade cover 6 and a safety cover 7 are attached for covering.

A handle 8 connected to the motor housing 3 is formed into a cylindrical shape by assembling a pair of left and right shells 8a that can be vertically divided. The upper arm portion 10 extends upward, and is tilted between the tip of the upper arm portion 10 and the tip of the lower arm portion 9, and is approximately
The grip part 11 inclined at 45 degrees is integrally connected,
An insertion opening 12 is opened between the handle 8 and the tip of the motor housing 3 into which each finger for gripping the grip portion 11 is inserted.

A switch 13 installed near the center of the grip part 11 of the handle 8 is slightly protruded downward as shown in P.
Two pairs of left and right protrusions 14 are provided with a push button 13a that is moved forward and backward in the direction, and are provided on both shells 8a forming the grip portion 11 so as to protrude from each other in opposite directions relative to the inner wall surface.
He is being held at 14 and unable to move.

A first trigger 15 and a second trigger 16 attached to the grip portion 11 to turn on and off the switch 13 are each formed into a substantially square tube shape with a bottom, and both triggers 15 and 16 are connected to each finger that grips the grip portion 11. When the grip mode is changed from one to the other, the position is easy to press with the index finger, corresponding to both grip modes.
That is, they are arranged inside both ends of the grip portion 11.

A first trigger 15 disposed at the end of the upper arm 10 side of the grip 11 is used to trigger the switch 13 between a pair of protrusions 17 and 17 protruding from the inner wall surfaces of both shells 8a. It is held so that it can move forward and backward in the P direction, which is the operating direction, and the vicinity of its tip is the bottom plate 11a of the grip part 11.
It protrudes so that it can be operated by pressing. A stepped portion 18 is provided protruding near the center of the inner side surface 15a of the first trigger 15, and both side surfaces 1 of the first trigger 15
5b and 15b each have a protrusion 1 at the center of the proximal end.
9 and 19 are provided protrudingly. On the other hand, a first trigger 1 is provided on the inner surface of both protrusions 17 in the grip portion 11.
Guide part 20 for guiding the outer surface 15c of 5
a and a stopper portion 20b for defining the retreating end of the first trigger 15 are connected in an L shape, and an inner rib 21 for guiding the upper part of the inner surface 15a of the first trigger 15. and the first trigger 1
A guide groove 22 recessed in order to slidably fit the protrusion 19 of No. 5 is formed, and the first trigger 15 is moved in the P direction with respect to the grip portion 11 by each rib 20, 21 and both guide grooves 22. is held in a slidable manner, and is always urged in the advancing direction by a spring 23 interposed between the bottom surface inside the first trigger 15 and the stopper portion 20b of the outer rib 20.

A second
The trigger 16 is held between a pair of protrusions 25, 25 protruding from the inner wall surfaces of both shells 8a so as to be able to move forward and backward in the P direction, and the vicinity of the tip thereof is connected to the bottom plate of the grip part 11. It protrudes from 11a so that it can be operated by pressing. A stepped portion 26 is provided protruding near the center of the inner side surface 16c of the second trigger 16, and protrusions 27 are provided protruding from the center portions of the base ends of both side surfaces 16b, 16b of the second trigger 16, respectively. ing. On the other hand, a second
A guide portion 28a for guiding the outer surface 16a of the trigger 16 and a stopper portion 28b for defining the retreating end of the second trigger 16 are connected to an outer rib 28 in an L shape, inner surface 16
an inner rib 29 for guiding the upper part of c;
A recessed guide groove 30 is formed in order to slidably fit the protrusion 27 of the trigger 16, and the second trigger 16 is formed with each rib 28, 29 and both guide grooves 30 in the P direction with respect to the grip part 11. The second trigger 1
6 and the stopper part 28b of the outer rib 28
It is always biased in the advancing direction by a spring 31 interposed between.

An inner surface 16c of the second trigger 16 is provided at the end of the bottom plate 11a of the grip portion 11 on the second trigger 16 side to prevent erroneous operation of pressing the second trigger 16 carelessly.
An erroneous operation prevention wall 32 attached to the lower part is formed to protrude.

Bottom plate 11 of grip part 11 facing switch 13
The strip-shaped operation plates 33 arranged side by side on the both shells 8
A pair of protrusions 3 protruding from the inner wall surface of a
4 and 34 and between both protrusions 14, and is held in the grip portion 11 so as to be immovable in the left-right direction but movable and tiltable in the P direction, and both ends 33a of the operation plate 33 , 33b are placed on the stepped portion 26 of the second trigger 16 and on the stepped portion 18 of the first trigger 15, respectively. When the motor 4 is stopped, the operation plate 33 is tilted parallel to the bottom plate 11a, and when the first trigger 15 is pressed, the first trigger 15 side end 33b of the operation plate 33 is pressed by the stepped portion 18 of the first trigger 15. When raised, the operation plate 33 tilts diagonally upward using its second trigger 16 side end 33a as a fulcrum, and presses the push button 13a of the switch 13.
is pushed at the center of the operation panel 33 and the switch 13
is turned on, and the motor 4 is started. On the other hand, when the second trigger 16 is pressed, the operation plate 33
The second trigger 16 side end 33a of the second trigger 16
The operation plate 33 is pushed up by the step 26 and tilts diagonally upward using the end 33b on the side of the first trigger 15 as a fulcrum, and the push button 13a is pushed by the center of the operation plate 33, turning on the switch 13. , motor 4 is started. Furthermore, when the first trigger 15 and the second trigger 16 are released from their pressed states, they advance to their original positions, the operation plate 33 returns to its original position parallel to the bottom plate 11a, and the switch 13 is turned off.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, a motor housing 3 is installed on the base 2, a motor 4 is housed in the motor housing 3, a circular saw blade 5 is rotationally driven by the motor 4, and a motor housing 3 is installed on the base 2. In the portable circular saw, the handle 8 has an inclination angle relative to the horizontal plane when the base 2 is horizontal, and an inclination angle relative to the horizontal plane when the base 2 is vertical. A grip part 11 is formed so that the angles are approximately equal to each other, and a hand gripping part 11 is formed inside near both ends of the grip part 11 to hold the grip part 11 when turning on/off a switch 13 inserted in the handle 8. The first and second triggers 1 are selectively operated with the index finger of the
5 and 16 are installed.

For this reason, during the normal cutting process in which the circular saw blade 5 is horizontally moved from the hand side to the front side (see Fig. 6A), the first
The trigger can be easily pressed and released, and the circular saw blade 5 can be used during mortise processing in which the circular saw blade 5 is vertically moved to cut the end face of the workpiece (see Fig. 6B), During the pulling-cutting process in which the handle is horizontally moved from the distal end to the hand side (see FIG. 6, c), the second trigger 16 can be easily pressed with the index finger during the moving operation.

Therefore, even when the gripping manner of the grip portion 11 is changed in response to a change in the moving direction of the circular saw blade 5, the on/off operation of the switch 13 is simplified in each gripping manner, thereby improving the operability and usability of the portable circular saw. It has the effect of improving the

In addition, since you can always work with one of the triggers 15 and 16 easily pressed, even if an unexpected situation such as a backlash occurs during work, you can instantly turn off the switch 13. be able to deal with unforeseen situations.

Next, a second embodiment of the present invention will be described with reference to FIG. 7. In this embodiment, the grip portion 1 of the handle 8A is
The first switch 13 is located at the end of the upper arm 10A of 1A.
A is installed internally, and this first switch 13
A is provided with a first trigger 15A for directly turning on and off the switch 13A, while a second switch 13A is provided on the lower arm 9A side end of the grip portion 11.
B is installed internally, and this second switch 13
A second trigger 16A for directly turning on and off the switch 13B is provided opposite to the switch B. The first switch 13A and the second switch 13B are connected in parallel, and both triggers 15A and 16A can be selectively pressed. It can be operated to drive and control the motor.

The functions and effects of the second embodiment are explained in the first embodiment.
Since it is almost the same as the embodiment, its explanation will be omitted.

(Effects of the invention) Since the present invention is constructed as described above, the common grip can be held comfortably in a natural hand shape, regardless of whether the circular saw is moved horizontally or vertically. This allows you to work with a balance between the force of gripping the handle and the force of propelling the handle, and even if you change the way you grip the handle, you can accurately operate the switch with the index finger of the gripping hand. have an effect.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a partially cutaway side view of a portable circular saw, FIG. 2 is a sectional view taken along the line X1-X1 in FIG. 1, and FIG. Figure 3 is a sectional view taken along the X2-X2 line, and Figure 4 is a cross-sectional view taken along the X3-X2 line.
5 is a side view of the main parts explaining the switch operation state, FIG. 6 is a side view illustrating how the portable circular saw is used, and FIG.
The figure is a side view of essential parts showing a second embodiment of the present invention, and FIGS. 8, 9, 10, and 11 are side views each illustrating how a conventional circular saw is used. 1...Base, 3...Motor housing, 5...
...Circular saw blade, 8,8A...Handle, 13,13
A, 13B...Switch, 15, 15A...1st
Trigger, 16, 16A...Second trigger.

Claims (1)

[Scope of utility model registration request] A motor housing installed on a base, a motor housed in the motor housing, a circular saw blade rotationally driven by the motor, and a handle installed on the base and connected to the motor housing. In the portable circular saw, the handle has a grip portion that is inclined so that the angle of inclination with respect to the horizontal plane when the base is horizontal is approximately equal to the angle of inclination with respect to the horizontal plane when the base is vertical. A pair of triggers are attached to the inside near both ends of the grip, which are selectively operated with the index finger of the hand gripping the grip when turning on and off the switch inserted in the handle. A portable circular saw with the following features: