JPH06114804A - Portable circular saw - Google Patents

Abstract

PURPOSE:To alter a direction of a handle of a portable circular saw so as to conform with operating conditions. CONSTITUTION:A handle 20 is clamped releasably by a handle fixing screw 24 at a motor housing 8 containing a motor 9 therein. A regulating hole 23 is opened in a circular state through a mounting part 20b of the screw 24 with an axial center of a motor shaft 9a of the motor 9 as a center to allow the handle 20 to rotatably displace around the shaft 9a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable circular saw used for cutting and grooving wood.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Patent Publication No. 46-
7156, JP-A-59-167202 and the like. Japanese Examined Patent Publication No. 46-7156 discloses a circular saw having a mechanism for adjusting a cutting depth by rotating a saw blade together with a safety cover, and Japanese Unexamined Patent Publication No. 59-167202 discloses a circular saw for a base and a handle. There is disclosed a circular saw in which a main body case provided with a saw blade is rotatably connected so that a handle does not move together with the main body case when adjusting a cutting depth.

[0003]

SUMMARY OF THE INVENTION In the above-mentioned conventional circular saw in which the handle is fixed at a fixed position, the orientation of the handle is adjusted according to the working position (height) and the working conditions such as the posture and height of the worker. Since it cannot be changed to a direction that is convenient for use, there is a problem in that the handle is unusable depending on the working conditions and the gripping of the handle becomes unnatural. For example, as shown in FIG. 9, when a circular saw m is installed at a low position to cut a work w on the floor in a low waist posture, it is necessary to work with the wrist t of the hand holding the handle h bent. Therefore, there is a problem in that the workability becomes very poor and proper cutting work becomes difficult, and it is difficult to apply a sufficient force for pushing the circular saw m in the cutting direction to the handle h. An object of the present invention is to provide a portable circular saw that can change the direction of the handle to a convenient direction according to the working conditions.

[0004]

According to the present invention, there is provided a motor housing in which a motor for rotationally driving a saw blade is housed,
A circular saw having a blade case joined to the motor housing in a state of covering the saw blade, and a handle having a switch for starting and stopping the motor attached, wherein the handle is provided in the motor housing. It has a structure in which the motor is fixed so as to be rotatable and displaceable around a motor shaft.

[0005]

The handle fixed to the motor housing in which the motor is housed is rotationally displaced around the motor shaft of the motor, and the direction of the handle is adjusted according to the working conditions and fixed to the motor housing.

[0006]

Since the present invention is configured as described above, the handle can be rotated and displaced in accordance with the working conditions such as the working position and the posture of the worker so that the orientation of the handle is the most convenient for the worker. You can turn to any direction. Therefore,
You can always work with a natural shape of the hand that holds the handle, and even when the working conditions are different, the force that pushes the portable circular saw in the cutting direction is always effectively applied to the handle for cutting. Work can be accurate and streamlined.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. In the portable circular saw M, a slot 1a having a long hole is formed in a base 1 having a substantially rectangular plate shape, and a front end portion of the base 1 is vertically moved by a spindle 4 installed on the front end portion. The front end of the blade case 3 supported so as to be capable of tilting is connected.

A grip 5 extending laterally is attached near the front end of the blade case 3, and a cylindrical gear housing 6 is butt-joined to the outer end of the blade case 3. .

A motor housing 8 having a cylindrical body portion 8a and a cover plate 8b connected to the outer end of the body portion 8a is concentrically and abuttingly installed outside the gear housing 6. There is.

A pair of front and rear lower projecting pieces 8c are provided on the lower portion of the inner end of the body portion 8a of the motor housing 8.
Screws 7 for fastening the motor housing 8 to the gear housing 6 are respectively inserted in c.

A pair of front and rear upper projecting pieces 8d are projectingly provided on the upper inner end of the body portion 8a of the motor housing 8.
In d, a through hole 8e and a screw hole 8f are formed on an arc having the center of the motor housing 8 as the arc center.

A motor 9 having a motor shaft 9a installed concentrically with the motor housing 8 is accommodated laterally in the motor housing 8, and a pinion 10 is formed on the motor shaft 9a.

Below the motor shaft 9a of the motor 9, a saw blade shaft 1 is rotatably supported by a pair of bearings 12.
1 is installed in parallel with the motor shaft 9a, and a transmission gear 13 meshed with the pinion 10 is fixed near the base end of the saw blade shaft 11.

A disk-shaped saw blade 16 is attached to the tip of the saw blade shaft 11 with a pair of inner and outer clamping members 15 fastened to the tip, and the upper half of the blade is covered with the blade case 3. It is fixed so that it can be rolled.

A guide member 17a, which is a long hole curved in an arc shape around the support shaft 4, is formed in the fixing member 17 which is erected on the rear portion of the base 1 in a forward rising posture. A screw 18 inserted through the blade case 3 is inserted therein.

The fastening lever 19 for fixing the blade case 3 in a tilted position to an arbitrary tilt position is extended rearward with its base end screwed into the screw 18.

When the blade case 3 is tilted up and down with the support shaft 4 as a fulcrum with the fastening lever 19 tilted upward and screwed back, the saw blade 1 protruding from the lower surface of the base 1
The cutting depth of the saw blade 16 can be adjusted by adjusting the protrusion amount of the blade 6, and the adjusted fastening lever 19 is tilted downward to adjust the blade case 3 to the fixing member 17 by the fastening lever 19 at a desired tilt position. Can be concluded.

A handle 20 fixed to the motor housing 8 and protruding substantially in the radial direction of the motor housing 8.
The handle main body 21 and the handle cover 22 are butt-joined with each other by screws to form a hollow shape.
The handle 20 is formed with a grip portion 20a having a substantially C-shaped side surface to be gripped by an operator, and the inner end of the grip portion 20a is formed by the inner end portion of the handle body 21 and has a circular side surface shape. Mounting portion 20 curved in an arc shape
b is connected, and an elongated adjustment hole 23 curved in an arc shape is formed through the mounting portion 20b in a range of about 180 ° about the axis of the motor shaft 9a of the motor 9.

The handle 20 has an adjusting hole 23 in the handle body 20 and a through hole 8 in the upper projecting piece 8d of the motor housing 8.
The front handle fixing screw 24 screwed into the screw hole 6a of the gear housing 6 inserted into e, and the rear handle screw inserted into the adjusting hole 23 and screwed into the screw hole 8f of the motor housing 8. The handle 20 is fastened to the motor housing 8 and the gear housing 6 with the fixing screw 24, and the handle 20 is releasably fixed to the motor housing 8 such that the handle 20 can be rotationally displaced around the motor shaft 9a. When the handle fixing screws 24 are loosened, the handle 20 is moved to the motor shaft 8
The handle 2 with respect to the base 1 is pivotally displaced around a.
The angle of 0 can be changed to an angle that is easy to grip.

A switch 25, which is operated by the hand holding the handle 20 to start and stop the motor 9, is attached near the center of the handle 20a of the handle 20.

Next, the operation and effect of the embodiment having the above configuration will be described. In this example, the mounting portion 20b of the handle 20 that is releasably fastened to the motor housing 8 in which the motor 9 is housed by the handle fixing screw 24 is curved in an arc shape around the axis of the motor shaft 9a of the motor 9. Adjustment hole 2 through which the handle fixing screw 24 is inserted
3 is provided so that the handle 20 can be rotationally displaced around the motor shaft 9a.

Therefore, the handle 20 can be rotated and displaced in accordance with the working conditions such as the working position and the posture of the worker to change the direction of the handle 20 to the direction that is most convenient for the worker. Therefore, it is possible to always perform the work with the natural shape of the hand holding the handle 20, and even if the working conditions are different, the force for pushing the portable circular saw M in the cutting direction is always applied to the handle 20. In addition, the cutting operation can be made precise and efficient. Further, even if the relative position between the base 1 and the motor housing 8 changes due to the adjustment of the cutting depth and the angle of the handle 20 with respect to the base 1 changes, the orientation of the handle 20 can be corrected.

As a means for fixing the handle 20, a fixing means using a lever may be adopted instead of the screw.

Next, the second embodiment of the present invention shown in FIGS. 6 and 7 will be described. In this embodiment, the mounting portion 20bA of the handle 20A is communicated with the adjusting hole 23 and is circular in the longitudinal direction of the adjusting hole 23. A large number of positioning holes 26 arranged in an arc shape
On the other hand, the front upper protruding piece 8dA of the motor housing 8A is provided adjacent to the upper side of the through hole 8eA, and selectively engages with one of the positioning holes 26 to handle the handle 2
The structure is the same as that of the first embodiment except that a stopper 27 that discontinuously changes the direction of 0A is provided.

In the present example, the handle fixing screw 24 is loosened to allow the stopper 27 to escape from the positioning hole 26, and the stopper 27 is engaged with the positioning hole 26 at the position where the orientation of the handle 20A is optimum, so that the handle fixing screw 24 is fixed. When fastened, the orientation of the handle 20A is fixed.

Therefore, in this example, the handle 20A can be doubly fixed by the handle fixing screw 24 and the stopper 27, so that the problem that the handle 20A is unintentionally rotationally displaced or displaced during work is solved. be able to.

[Brief description of drawings]

FIG. 1 is a side view of a portable circular saw showing a first embodiment of the present invention.

FIG. 2 is likewise a partially cutaway front view of a portable circular saw.

FIG. 3 is an enlarged sectional view taken along line X1-X1 of FIG.

FIG. 4 is an enlarged sectional view taken along line X2-X2 of FIG.

FIG. 5 is a side view of the portable circular saw showing a state in which the handle is pivotally displaced forward.

FIG. 6 is a side view of the portable circular saw showing a state in which the blade case is tilted upward and the handle is rotationally displaced rearward.

FIG. 7 is a plan view of an essential part showing a second embodiment of the present invention.

8 is an enlarged cross-sectional view taken along line X2-X2 of FIG.

FIG. 9 is an explanatory diagram illustrating a usage state of a circular saw.

[Explanation of reference numerals] 1 base 3 blade case 8 motor housing 9 motor 9a motor shaft 16 saw blade 20 handle 25 switch

Claims (1)

[Claims] 1. A motor housing in which a motor for rotating a saw blade is housed, a blade case connected to the motor housing in a state of covering the saw blade, and a switch for starting and stopping the motor. A circular saw having a handle attached thereto, wherein the handle is fixed to the motor housing so as to be pivotally displaceable around a motor shaft of the motor.