JPH0580624U - Saw blade holding structure for cutting tools - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has different widths of mounting parts and different uses.
The present invention relates to a saw blade holding structure for a cutting tool such as an electric reciprocating saw that requires two types of saw blades, and its purpose is to attach the two types of saw blades without leaving a gap at the base of the pin. To prevent the pin from breaking easily. [Structure] A saw blade mounting portion 8 provided at the tip of the plunger 3 is closely fitted to a saw blade 6B having a narrow width, and a recess having a thickness t'which is slightly shallower than the thickness of the saw blade 6B. 1
3B is provided, and the saw blade holding member 4 is provided with a concave portion 13A that is closely fitted to the wide saw blade 6A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a saw blade holding structure for a cutting tool such as an electric reciprocating saw having two types of saw blades for different purposes.

[0002]

[Prior Art]

 A conventional saw blade holding structure using a saw blade holding member will be described with reference to FIGS. 1, 5, and 6. Saw blade mounting portion 8 formed integrally with the tip of the plunger 3 and the saw blade holding member 4 sandwiches the saw blade 6, and the reciprocating movement of the saw blade 6 cuts the work material. Since the tool requires a plurality of saw blades 6 having different widths of mounting portions and different uses, the conventional saw blade holding structure has the same saw blade holding member 4 as shown in FIGS. The surface is provided with a two-step concave portion that fits both widths of the two types of saw blades 6A and 6B, and a pin 11 that engages with a pin insertion hole 12 of the saw blade 6.

[0003]

[Problems to be solved by the device]

 Normally, the wide saw blade 6A is used under a high load, and the narrow saw blade 6B is used under a low load. As shown in Fig. 5, when the wide saw blade 6A is attached and the work is performed, the saw blade 6A and the saw blade are held because the saw blade 6A is overlapped with the recess of the groove that fits into the narrow saw blade 6B. Since a gap 14 is formed between the members 4, the distance from the root of the pin 11 to the load point is longer than when a narrow saw blade 6B is attached, and the tip of the pin 11 has a very large bending moment. Works, and the pin 11 is easily broken from the root.

When the pin 11 is provided on the side of the flat plunger 3, both the two types of saw blades 6A and 6B are hard to attach and break without a gap at the base of the pin 11, but the saw blade 6 during cutting is There is a case where the work is caught in the work material and an excessive load acts on the pin 11, and the pin 11 is sheared from its root. If the pin formed integrally with the plunger 3 is sheared, the plunger 3 will be very expensive and the repair cost will be high. Further, even if the pin 11 is attached to the plunger 3 in a replaceable manner, there is a problem that replacement is very difficult because the mechanism must be disassembled to remove the plunger 3 from the main body. The purpose of the present invention is to make it possible to attach two kinds of saw blades without replacing the saw blade holding member, to make the pins hard to break, and to make it possible to replace the pins cheaply and easily even if they break. That is.

[0005]

[Means for Solving the Problems]

 The above-mentioned object can be achieved by providing a concave portion and a pin for a wide saw blade on the saw blade holding member side and a narrow concave portion for a saw blade on the plunger side.

[0006]

[Action]

 In the cutting tool configured as described above, the concave portion for the wide saw blade and the pin are provided on the saw blade holding member side, and the concave portion for the narrow saw blade is provided on the plunger side. Two types of saw blades can be attached without exchanging the saw blade holding member, and both types of saw blades are attached so as to abut the root of the pin, so that a width where the high load is easily applied to the pin Pins are hard to break even when a wide saw blade is attached. Further, since the pin is provided on the saw blade holding member side, even if the pin is broken, it can be easily replaced at low cost.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the rotational movement from the motor 1 is converted into the reciprocating movement of the plunger 3 via the mechanical portion inside the gear cover 2. In FIG. 2 and FIG. 3, a saw blade attaching portion 8 provided at the tip of the plunger 3 and a groove 13A for tightly fitting the wide saw blade 6A are formed in the saw blade holding member 4. To do. 2 and 4, the saw blade mounting portion 8 is provided with a concave portion 13B having a thickness t ', which is slightly shallower than the thickness t of the narrow saw blade 6B. The saw blade holding member 4 is formed with a pin 11 which is aligned with the pin insertion hole 12 of the saw blade 6 with the saw blade 6A or 6B fitted, and the cutout portion 9 of the saw blade 6 is formed. Through holes 10 are formed so as to coincide with each other and to coincide with the screw holes 5 provided in the saw blade mounting portion 8. The wide saw blade 6A is between the recess 13A formed in the saw blade holding member 4 and the saw blade mounting portion 8, and the narrow saw blade 6B is the recess 13B formed in the saw blade mounting portion 8. It is clamped between the saw blade holding members 4 by screws 7.

Further, the saw blade holding member 4 has a common through hole 10 for back to back, and by forming the pin 11 and the recess 13A in the same shape and the same positional relationship, even if one pin 11 is damaged, the other surface is used. be able to.

[0009]

[Effect of the device]

 According to the present invention, since the saw blade holding member is provided with the recess and pin for the wide saw blade, and the saw blade mounting portion of the plunger is provided with the recess for the narrow saw blade, Both types of saw blades can be mounted so as to abut the root of the pin, and even when a saw blade with a wide width and high load is attached, the bending stress applied to the root of the pin is small Hard to break.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a saw blade holding structure of the present invention.

FIG. 3 is a front view when a wide saw blade is attached to the cutting tool of the present invention.

FIG. 4 is a front view when a narrow saw blade is attached to the cutting tool of the present invention.

FIG. 5 is a front view of a conventional saw blade holding structure with a wide saw blade attached.

FIG. 6 is a front view of a conventional saw blade holding structure with a wide saw blade attached.

[Explanation of symbols]

1 is a motor, 2 is a gear cover, 3 is a plunger, 4 is a saw blade holding member, 5 is a screw hole, 6 is a saw blade, 6A is a wide saw blade, 6B is a narrow saw blade, 7 Is a screw, 8 is a saw blade mounting portion, 9 is a notch portion, 10 is a through hole, 11 is a pin, 12 is a pin insertion hole, 13 is a concave portion, and 14 is a gap.

Claims (1)

[Scope of utility model registration request] 1. A plunger driven by a motor,
A cutting tool for holding a saw blade between a saw blade mounting portion and a saw blade holding member integrally formed at the tip of the plunger, and cutting a work material by reciprocating movement of the saw blade, On the side of the saw blade holding member, a recess for mounting a wide saw blade and a pin that engages with a pin insertion hole of the saw blade are provided, and a narrow saw blade is attached to the saw blade mounting portion of the plunger. A saw blade holding structure for a cutting tool, which is provided with a concave portion to be mounted so that two types of saw blades having different widths can be held.