JP2000042949A - Battery type portable band saw machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a weight balance and to improve operability by installing a pair of saw wheel bases for supporting saw wheels on both sides of a motor housing, installing the front end part on one saw wheel base, and installing a battery in the handle rear end part extending in the housing lengthwise direction. SOLUTION: In a housing 1 for housing a DC motor 7, saw wheel bases 4, 5 for rotatably supporting saw wheels 2, 3 are installed on both sides so that a band saw 6 is extended between the saw wheels 2, 3. A handle 14 extends in the lengthwise direction of the housing 1 by installing the front end in the upper part of the saw wheel base 4, a battery 17 is detachably installed in the rear end part, and the rear is installed in the lower part of the saw wheel base 4 through a stay 16. When turning on a switch 15 the battery 17 drives the motor 7, and the saw wheel 2 is revolvingly driven to cut a material by the band saw 6. The material can be cut without projecting the motor 7 from the cutting surface, a cutting place is not specified and the center of gravity is positioned in the vicinity of the handle 14 to improve operability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated portable band saw using a battery as a driving power source.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional AC type portable band saw. As shown in the drawing, this band saw machine rotatably mounts saw wheels 2 and 3 in a pair of saw wheels bases 4 and 5 mounted on both sides of a housing 1 housing an AC motor 18. , The worm wheel 20 and the saw wheel 2 by the motor 18 via the sprockets 11 and 12
Is driven to rotate and cut the band saw 6 stretched over the saw wheels 2 and 3. The handle 21 having the switch 15 is mounted on the upper part of the saw wheel base 4.

[0003] As is well known, the power transmission mechanism of the worm 19 and the worm wheel 20 can have a large reduction ratio, but has high friction, so lubrication with gear oil is required.
An oil seal 24 must be provided to prevent gear oil from flowing into the housing 1 and the saw wheel base 4. For this reason, the mechanical loss of the oil seal 24 is large in combination with the large mechanical loss of the worm mechanism, and when this configuration is adopted in a battery-powered band saw, the battery is quickly consumed, There is a problem that the actual operation time is short. Further, the center of gravity of the entire band saw machine is located in the housing 1, but the distance between the center of gravity and the handle 21 is long, so that there is a problem that operability is poor.

There is a band saw shown in FIG. 5 which solves the above-mentioned problem shown in FIG. In this band saw, a motor 22 is provided near a handle 21 and a helical gear 2 for rotating the motor 22 is provided.
3 to drive the saw wheel 2.

[0005]

In the band saw shown in FIG. 5, the motor 22 is provided near the handle 21, so that the center of gravity is closer to the handle 21, the weight balance is improved, and the operability is improved. However, as shown in FIG. 6, since the motor 22 protrudes from the cut surface A, the material 2 protruding from the wall 27
6 cannot be cut at the B portion near the wall, and there is a disadvantage that the cut position is specified.

It is an object of the present invention to provide a battery-operated portable band saw which eliminates the above-mentioned disadvantages of the prior art, improves weight balance, and has good operability.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pair of saw wheels mounted on both sides of a housing housing a motor and extending downward, one of which is driven by a motor and the other of which is driven by a motor. The saw wheel is rotatably supported, the front end is mounted on one of the saw wheel bases, and the battery that serves as the drive power for the motor is detachably mounted on the rear end of the handle that extends along the longitudinal direction of the housing. It is achieved by doing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a battery-powered portable band saw,
FIG. 2 is a top view of FIG. 1, and FIG. 3 is a right side view of FIG. 1 showing cutting of a material near a wall.

1 and 2, a pair of saw wheel bases 4 and 5 for rotatably supporting saw wheels 2 and 3 are mounted on both sides of a housing 1 in which a DC motor 7 is housed. A band saw 6 is stretched between the three. Saw car 2,
3 is rotated by a motor 7 and the band saw 6 circulates between the saw wheels 2 and 3. A part of the band saw 6 is exposed, and the exposed portion is twisted at a right angle by a cell 25 provided on the saw wheel bases 4 and 5.

A planetary gear 8 provided at the tip of a motor 7
The bevel gear 9 is attached to the tip of the output shaft of
A spindle 10 provided with a bevel gear that meshes with the wheel 2 is provided in parallel with the axis of the saw wheel 2. Spindle 10 and saw wheel 2
Are provided with sprockets 11 and 12,
By stretching the chain 13 between the 12
Are the planetary gear 8, bevel gear 9, spindle 1
The motor 7 is rotatably driven through the sprockets 11 and 12 and the chain 13. A handle 14 having a front end mounted above the saw wheel base 4 extends along the longitudinal direction of the housing 1, and a battery 17 serving as a power supply for driving a motor is detachably mounted at a rear end. The rear of the handle 14 is mounted below the saw wheel base 4 via a stay 16.

In the above configuration, when the switch 15 is turned on, the motor 7 is driven by the battery 17, and the planetary gears 8,
The saw wheel 2 is rotationally driven through the bevel gear 9, the spindle 10, the sprocket 11, the chain 13, and the sprocket 12, and cuts the material with the band saw 6. Since the motor 7 is housed in the housing 1, as shown in FIG. 3, the motor 7 does not protrude from the cut surface A, and the material 26 protruding from the wall 27 can be cut at the portion B. That is, the cutting place is not specified. In addition, since the handle 14 is provided between the battery 17 and the motor 7, the center of gravity is located near the handle 14, so that operability can be improved.

By using a battery-operated type, the band saw can be easily moved without worrying about the installation location of the power supply. Work, and work inside a building site before power supply wiring work can be performed. Further, even when the power source is located, the trouble of crawling the cord on the cord reel every time the band saw is moved is relieved.

Further, since the reduction ratio can be increased by the planetary gear 8 and the bevel gear 9 can be employed, transmission loss is reduced, and lubrication using gear oil is not required, and the oil seal 24 can be eliminated. The loss can be further reduced, and a long-time cutting operation can be performed even when the battery is driven.

[0014]

According to the present invention, the motor is housed in the housing, and the battery is arranged behind the handle, so that the center of gravity is near the handle, so that the weight can be balanced when the handle is held. Thus, operability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a battery-powered portable band saw showing an embodiment of the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a right side view of FIG. 1 showing a state of cutting a material near a wall.

FIG. 4 is a front view showing an example of a conventional portable band saw machine.

FIG. 5 is a front view showing another example of a conventional portable band saw.

FIG. 6 is a right side view of FIG. 5 showing a state at the time of cutting a material near a wall.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 4 ... Saw car base, 7 ... Motor, 9
... bevel gears, 14 ... handles, 17 ... batteries.

Claims (1)

[Claims] 1. A pair of saw wheel bases mounted on both sides of a housing housing a motor and extending downward, and rotatably supported by the pair of saw wheel bases, one of which is driven by the motor. The saw and driven saw, and the belt stretched over the driven and driven saw, the front end of which is attached to one of the saw bases and extends along the longitudinal direction of the housing. A battery type portable band sawing machine comprising a handle and a battery detachably attached to a rear end of the handle and serving as a power supply for driving a motor.