JP2543355B2 - Electric saw - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric saw that reciprocally moves a saw blade by electric force to perform a cutting operation, and in particular, an electric saw with a built-in battery excellent in hand-held operability. Regarding the saw.

(B) Conventional technology An electric saw called reciprocating saw has a horizontally long shape with a reciprocating saw blade detachably attached to the tip and a D-shaped handle on the back of the body, and a power switch is provided on the handle. It was common to have a cord for power supply.

C. Problems to be solved by the invention As is apparent from the shape of the conventional electric saw described above, one hand holds the front part of the body, and the other hand holds the rear part of the D-shaped handle. The power switch is operated by grasping the end part, but when holding the object to be cut with one hand and operating it with one hand, it is necessary to grasp the handle at the rear side away from the center of gravity. It is extremely difficult to maintain the posture. Also, because it requires the supply of power,
If there is no outlet nearby, it is necessary to make arrangements for it, and there are drawbacks such as poor handling and operability due to the cord obstructing during work and lack of mobility due to its oblong shape.

D. Means for Solving the Problems The present invention solves the problem of power supply by incorporating a battery in view of the drawbacks of the above-described conventional electric saw, and at the same time, the workability is improved by an appropriate arrangement relationship of the constituent members. In the pursuit of improvement, the structure has a means for converting a rotary motion into a reciprocating motion by a slider mechanism that removably mounts a saw blade at its tip and reciprocates, and a motor that applies power to the slider mechanism. The rotation axis of the motor and the reciprocating direction of the slider are connected to each other at right angles through the provided reduction mechanism, and the battery is attached to the side of the motor in the direction opposite to the saw blade attachment side to form a crank shape. Placed in
Further, the power switch is provided near the position where the motor is provided, which is the center of gravity, when the battery is attached.

The overall length is shortened by arranging each of the operating members in the shape of a crank, and the built-in battery eliminates the need for an external power source, dramatically improving maneuverability. Further, since the power switch is provided at the time of mounting the battery at the motor arrangement position close to the center of gravity, even if the user holds the battery arrangement position and operates it with one hand, the workability is further improved.

F. Embodiments The drawings show an embodiment of an electric saw according to the present invention, in which reference numeral 1 denotes a slider mechanism.
Is composed of a slider 3 slidably supported in the front and rear direction by bearings 2, 2, 2, and at the tip of the slider 3,
A mounting portion for connecting the base end portion of the saw blade 4 via a hexagon socket head cap bolt 5 is provided, and a receiving member 6 having front and rear contact plates is fixed above the rear end portion. Reference numeral 7 denotes a motor. The motor 7 has a rotating shaft 7a arranged in a state orthogonal to the reciprocating direction of the slider 3, and the rotating shaft 7a has a small diameter of a reduction mechanism 8 including a pair of reduction gears 8a and 8b. Reduction gear
8a is installed. On the other hand, on the lower surface of the large-diameter reduction gear 8b, a connecting pin 9 is provided so as to project downward and in parallel with the rotating shaft 7a, and the connecting pin 9 is attached to the receiving member 6 fixed to the upper end of the rear end of the slider 3. By loosely fitting the space between the contact plates through the bearing, the rotational movement of the motor 7 can be controlled by the slider 3
Is converted into reciprocating motion and transmitted.
Since the slider mechanism 1 and the motor 7 are arranged in such an L-shaped arrangement relationship as described above, the connection with the mechanism for converting and transmitting the rotational movement into the reciprocating movement can be easily performed.
Further, on the side of the motor 7, the mounting side of the saw blade 4 (slider 3
The battery 10 is arranged so as to project rearward in a direction opposite to the direction (longitudinal tip direction). Therefore, the slider mechanism 1, the motor 7, and the battery 10 are arranged in a crank shape to shorten the total length. These components are
It is housed in a housing 11 formed in two parts, and the housing 11 is integrated by screwing. In addition, a power switch is provided in the housing 11, which is behind the slider 3.
12 is provided, and the power switch 12 is adapted to be operated by a switch lever 13 provided at a lower portion of the battery 10, and the switch lever 13 is provided with a lock mechanism 14. The position of the switch lever 13 corresponds to the position of the center of gravity of the main body, thereby ensuring the stability during the gripping operation. The power switch 12 and the switch lever 13 may be provided above when the battery is attached at the position where the motor 7 is provided. housing
At the front end of 11, a collar body 15 for ensuring the safety of the worker is provided around, and a saw blade insertion window 16 is opened at the tip, and the saw blade insertion window 16 has An idle roller 17 and a shoe 18 for guiding the saw blade 4 are attached via roller pins 19. Also, the lower surface of the housing portion of the slider mechanism 1 in the housing 11 draws a gentle curve so that both sides are slightly scraped off with respect to the arc surface, and when both hands are operated, it is easy for the hands to fit It is shaped and can be held with a natural feel. Further, on the lower surface of the housing 11, there is formed a hexagonal wrench storage portion composed of a groove portion 20 having locking projections 20a, 20a on both sides and a small diameter vertical hole 21 formed on the extension thereof. A hexagon wrench M for efficiently exchanging the blade 4 is efficiently attached.

In this embodiment, the battery storage portion is provided so as to project rearward from substantially the center of the motor storage portion, and the motor storage portion has a shape protruding upward. Can be eliminated, and the battery mounting position can be further moved to the upper position or the rear end position of the housing. Further, the structure, size, etc. of the power switch, slider mechanism, reduction mechanism, etc. may be changed as appropriate.

The electric saw of the present invention has a built-in battery, which relieves the operator from the hassle of securing a power supply means, and also makes it difficult to work because the cord interferes with the work. There are no accidents where you have to cut and interrupt your work. In addition, the designer does not need to provide a cord at the rear end, and instead of sticking to the basic design of the past, each member is arranged in a crank shape to shorten the overall length, and an appropriate power switch is provided. Depending on the arrangement, it is possible to operate only one hand by gripping only the rear protruding part, and by using a completely different usage mode utilizing the compactness, maneuverability and operability can be improved and work efficiency can be greatly improved. it can.

[Brief description of drawings]

The drawings show an embodiment of an electric saw according to the present invention. FIG. 1 is a front view in which a part of a housing is cut out to expose an internal structure, FIG. 2 is a partial bottom view, and FIG. Is a sectional view taken along line AA, and FIG. 4 is a perspective view. 1 ... Slider mechanism, 2 ... Bearing, 3 ... Slider, 4 ... Saw blade, 5 ... Hexagon socket head bolt, 6 ... Receiving member, 7 ... Motor, 8 ... Reduction mechanism, 8a, 8b ...... Reduction gear, 9 ...... Connection pin, 10 ...... Battery, 11 ...... Housing, 12 ...... Power switch, 13 ...... Switch lever, 14
...... Lock mechanism, 15 ...... Collar body, 16 ...... Saw blade insertion window, 17 ・ ・ ・
… Idler roller, 18 …… Shoe, 19 …… Roller pin, 20…
… Groove, 20a …… Locking protrusion, 21 …… Vertical hole, M …… Hexagon wrench

Claims (1)

(57) [Claims] 1. A reduction mechanism having means for converting a rotary motion into a reciprocating motion of a slider mechanism reciprocating with a saw blade removably attached to its tip and a motor for applying power to the slider mechanism. The rotary shaft of the motor and the reciprocating direction of the slider are orthogonally connected, and the battery is attached to the side of the motor in the direction opposite to the saw blade attachment side to arrange the three in a crank shape. An electric saw provided with a power switch near the position of the motor at the center of gravity when the battery is attached.