JPH0546809Y2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a portable band saw used for cutting operations.

(Prior Art) Conventionally, in this type of portable band saw,
Broadly speaking, the saw frame is divided into a driving side saw cover part equipped with a driving pulley for supporting an endless saw blade, and a driven side saw cover part equipped with a driven pulley for supporting the saw blade. and a connecting part that connects the both saw cover parts, and this connecting part is laterally equipped with a motor that also serves as the connecting member and drives the drive pulley (for example,
57-26893), and another in which the motor is vertically mounted on the drive-side saw cover (for example, see Japanese Patent Publication No. 54-3266).

(Problems to be solved by the invention) In any of these types of portable band saws, there are problems of weight reduction and manufacturing cost.
Furthermore, when cutting, if deformation such as bending or twisting occurs in the connecting part that connects the drive-side saw cover part and the driven-side cover part, the saw blade will come off from both pulleys, which is a safety issue and a problem with accuracy. There was a problem that various defects occurred on the surface, which ultimately hindered the performance of the cutting work.

However, in the case of the former type of portable band saw, the structure is such that the motor housing is equipped with a horizontal connection between the drive-side saw cover part and the driven-side cover part and also serves as the connection member. From the viewpoint of This has the disadvantage that the rotation transmission mechanism with the drive pulley is complicated. In addition, although the latter type of portable band saw can eliminate the drawbacks of the former, it cannot structurally solve the problem of deformation due to bending, twisting, etc. at the connecting part, and as a result, This problem was solved by forming the entire saw frame, including the connecting parts, from a metal material, which inevitably resulted in a heavy weight. I couldn't do it.

Therefore, the present invention aims to reduce the weight of the portable band saw as a whole, and provides a portable band saw that can be manufactured at low cost and that can eliminate as much as possible the occurrence of deformation due to bending, twisting, etc. at the connecting part. It is intended to.

(Means for Solving the Problems) In order to achieve the above object, the portable band saw of the present invention is equipped with a drive pulley on which a drive motor is mounted and the saw blade is driven to circulate by the drive motor. a drive-side saw cover part that is connected to the driving pulley to support the saw blade; a driven-side saw cover part that is equipped with a driven pulley that supports the saw blade and is connected to the drive pulley; The saw blade frame includes a connecting part that connects the saw blade while leaving an exposed part, and the saw cover part on one side is equipped with a main handle part, and the saw cover part on the other side is equipped with an auxiliary grip. The portable band saw is equipped with a saw blade frame integrally molded with synthetic resin, and
The gist of the present invention is that a reinforcing member made of metal is installed at the connecting portion of the saw blade frame.

Further, the reinforcing member may be formed from a main plate portion that covers the upper surface and both side surfaces in the longitudinal direction of the connecting portion, and reinforcing ribs that protrude from the lower surface of the main plate portion and are buried within the connecting portion. preferable.

Furthermore, the reinforcing member is formed from a main plate part extending in the longitudinal direction of the connecting part, and a bent plate part extending substantially at right angles from at least one end of the main plate part, and this bent plate part is arranged on the driven side of the saw blade frame. It is preferable to install it by positioning it in the saw cover section of the saw.

(Function) By providing a reinforcing member made of metal at the connection portion between the drive-side saw cover portion and the driven-side saw cover portion in the saw blade frame, the connection portion can be reinforced.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 indicates the entire saw frame of a portable band saw, and the saw frame 1 is molded from synthetic resin, and is disposed on one side (the right side in Figure 1) and is used to attach a drive pulley, which will be described later. a drive-side saw cover part 2; and a driven-side saw cover part 3, which is disposed on the other side (on the left side in FIG. 1) opposite to the drive-side saw cover part 2 and to which a driven pulley to be described later is attached. and an oblong connecting portion 4 that connects one side of the opposing sides of the saw cover portions 2 and 3 at a predetermined interval. The both saw cover parts 2 and 3 are each formed into a substantially flat shell shape with the lower part open, and between the both saw cover parts 2 and 3 and the connecting part 4 there is an exposed part of the saw blade which will be described later. A space 5 having a substantially gate-shaped plane is formed so as to form a space 5. Furthermore, mounting recesses 2a and 3a of a desired width are formed on the upper surfaces of the both saw cover parts 2 and 3 along opposite side edges, and the mounting recesses 2a and 3a are formed on the entire upper surface of the connecting part 4. , 3a are formed in the same way, and two fitting grooves 6, 6, which are approximately inverted L-shaped in plane, are formed in the continuous mounting recesses 2a, 3a, 4a at a predetermined depth from the top surface. It is engraved.

A flat reinforcing member 7 formed from metal such as steel is attached to the continuous mounting recesses 2a, 3a, 4.
A main plate part 7a is formed in a substantially inverted L-shape in plane and has a bulging protrusion corresponding to the mounting recess 2a at one end thereof, one side edge of this main plate part 7a, and A side plate part 7b formed on opposing side edges of the other piece (bent plate part) and the projecting piece;
It is comprised of two reinforcing ribs 7c, 7c that protrude from the lower surface of the main plate portion 7a so as to correspond to the two fitting grooves 6, 6. The reinforcing member 7 is attached to the continuous mounting recesses 2a, 3a,
4a, its side plate portion 7b is aligned with the side surface of the connecting portion 4 and the opposing side edges of the both saw cover portions 2 and 3, and the reinforcing ribs 7c and 7c are
It is attached and fixed with screws etc. while being fitted into the fitting grooves 6, 6 of the strips. That is, the reinforcing member 7, which is approximately inverted L-shaped in plan and has a bulging protrusion at one end, is integrally reinforced from the connecting portion 4 of the saw frame 1 to part of both saw cover portions 2 and 3. is configured to do so.

A motor housing 9 housing a motor 8 vertically is installed on the driving saw cover part 2 via a gear housing, and an operating handle 10 whose upper end is connected to the motor housing 9 is installed in an inclined manner. Furthermore, a changeover switch 11 for motor speed change is attached to the lower end of the operating handle 10. A drive pulley 13 that is actively rotated by the motor 8 via a reduction gear group 12 is horizontally supported 14 in the drive saw cover section 2 .

An auxiliary grip 15 is attached to the reinforcing member 7 on the driven saw cover part 3, and a driven pulley 16 is mounted within the saw cover part 3 on the same plane as the driving pulley 13 with a movement adjustment mechanism 17. The shaft 16a is rotatably supported so that its movement in the radial direction can be adjusted via the shaft 16a.

The driving pulley 13 and the driven pulley 16
An endless saw blade 18 is hung on the outer periphery between the saw blade 18 and most of the saw blade 18 is located within the both saw cover parts 2, 3 and the connecting part 4 of the saw frame 1, and is The drive pulley 13 is disposed so that the drive pulley 13 is positioned in the empty space 5, and is driven to circulate along the drive pulley 13 and the driven pulley 16 by the active rotation of the drive pulley 13.

Note that guide mechanisms 19 each consisting of a pair of rollers are provided on both saw cover parts 2 and 3 of the saw frame 1, respectively.
19 is attached, and the guide mechanism 19, 19 tilts the saw blade 18 with respect to the axis of rotation of the drive pulley 13 when the saw blade 18 is exposed from the saw frame 1 and passes through the cavity 5. A ruler 20 for positioning the workpiece is provided in the vicinity of the guide mechanism 19 of the saw cover section 2 for driving, extending diagonally downward across the saw blade 18. There is.

This example has the above-mentioned configuration, and its operation will be explained.

Now, in this example, the drive pulley 13 is actively rotated by the drive of the motor 8 via the reduction gear group 12, and as the drive pulley 13 actively rotates, the saw blade 18
is driven to circulate while being guided by the driven pulley 16.

When the saw blade 18 passes through the so-called cavity 5 exposed from the saw frame 1, the saw blade 18
This is used to carry out operations such as cutting according to No. 8.

Therefore, during work such as cutting, the operator must hold the operation handle 10 of the saw cover part 2 on the drive side and the auxiliary grip 15 of the saw cover part 3 on the driven side with respect to the saw frame 1. The saw frame 1 has a structure in which a saw cover part 2 on the driving side and a saw cover part 3 on the driven side are connected at one side of their opposing sides by a connecting part 4, and the saw blade 1
8 is the other side of both saw covers 2 and 3 facing the connecting portion 4, so the force generated during cutting acts on the connecting portion 4 as bending or twisting. In this example, since the connecting portion 4 is reinforced by a metal reinforcing member 7, the occurrence of bending or twisting in the connecting portion 4 is prevented.

(Effects of the Invention) As described above, the present invention includes a drive-side saw cover portion on which a drive motor is mounted and a drive pulley for circulating the saw blade by the drive motor; a driven-side saw cover part equipped with a driven pulley that supports and is connected to the driving pulley; and a connecting part that connects both the saw cover parts with an exposed part of the circularly driven saw blade remaining. By integrally molding the saw blade frame made of synthetic resin and installing a reinforcing member made of metal at the connection part of the saw blade frame, the entire portable band saw is lightweight and inexpensive. In addition, deformation due to bending, twisting, etc. in the connecting portion can be avoided as much as possible. This prevents the problem of the saw blade coming off from both pulleys, and allows work such as cutting to be performed safely and with high precision.

Furthermore, by providing the reinforcing rib with the reinforcing rib and embedding it within the connecting portion, the above-mentioned reinforcing effect can be further enhanced.

Furthermore, the reinforcing member is formed from a main plate part extending in the longitudinal direction of the connecting part, and a bent plate part extending substantially at right angles from at least one end of the main plate part, and this bent plate part is arranged on the driven side of the saw blade frame. By attaching it to the saw cover section, it is possible to reinforce the connecting portion between the connecting section and the saw cover section, and also prevent deformation of the saw cover section itself, which has the advantage of further increasing the reinforcing effect. have

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an exploded perspective view of the main parts, FIG. 2 is a plan view showing the entire portable band saw, FIG. 3 is a partially cutaway side view, and FIG. Figure 4 is a sectional view showing the saw cover on the drive side.
Figure 5 is a side view of Figure 2, Figure 6 is the V-
It is a V-line enlarged sectional view. 1... Saw frame, 2... Drive side saw cover part, 3... Driven side saw cover part, 4... Connection part,
5... Blank space, 6... Fitting groove, 7... Reinforcement member, 7
a...Main plate part, 7b...Side plate part, 7c...Reinforcement rib, 8...Motor, 10...Operation handle, 13
...Drive pulley, 15...Auxiliary grip, 16...
...Driver pulley, 18...Saw blade.

Claims (1)

[Claims for Utility Model Registration] 1. A drive-side saw cover part on which a drive motor is mounted and a drive pulley for circulating the saw blade by the drive motor, and a drive-side saw cover part that supports the saw blade. A saw comprising: a driven-side saw cover part equipped with a driven pulley linked to the driving pulley; and a connecting part that connects both the saw cover parts, leaving an exposed part of the circularly driven saw blade. A portable band saw is provided with a blade frame, a main handle is installed on the saw cover on one side, and an auxiliary grip is installed on the saw cover on the other side, and the saw blade frame is made of synthetic resin. 1. A portable band saw characterized in that the saw blade frame is integrally molded with a reinforcing member made of metal at the connecting portion of the saw blade frame. 2. The reinforcing member is comprised of a main plate portion that covers the upper and side surfaces of the connecting portion in the longitudinal direction, and reinforcing ribs that protrude from the lower surface of the main plate portion and are buried within the connecting portion. Claim 1
Portable band saw as described. 3. The reinforcing member is composed of a main plate part extending in the longitudinal direction of the connecting part, and a bent plate part extending at a substantially right angle from at least one end of the main plate part, and this bent plate part is connected to the driven side of the saw blade frame. 3. The portable band saw according to claim 1, wherein the portable band saw is attached to the saw cover.