JP2867583B2 - Jigsaw saw blade fixing mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a jigsaw saw blade fixing mechanism.

[Conventional technology]

A jigsaw is a tool for cutting various materials such as wood, plastic, and iron plate. A large number of jigsaw saw blades are prepared according to the material and thickness to be cut. Therefore, it is necessary to replace the saw blade each time depending on the material to be cut, and the replacement frequency is high.

[Problems to be solved by the invention]

Normally, there are various types of saw blade replacement tools from commercially available tools such as spanners and screwdrivers to special tools, and the replacement of the saw blade is performed using these replacement tools. However, it is troublesome to prepare and manage these replacement tools. Further, there has been a problem that the attachment and detachment of the saw blade cannot be performed due to loss or failure of these replacement tools.

SUMMARY OF THE INVENTION An object of the present invention is to provide a saw blade fixing mechanism that can easily attach and detach a saw blade of a jigsaw.

[Means for solving the problem]

The object is to provide a set piece provided at the lower end of the plunger, a lever that rotates about a pin provided on the set piece, a knob bolt that pushes the lever toward the plunger at a position away from the fulcrum of the lever, and a lever. And a working pin which is located between the fulcrum of the knob and the knob bolt and is pressed by the lever to act to fix the saw blade.The pressing force of the knob bolt against the lever is used as a holding force to the saw blade via the working pin. It is achieved by having it act as a boost.

[Action]

The present invention uses a lever mechanism based on the principle of leverage in the saw blade attachment portion of the jigsaw body so that the saw blade can be held by the force for tightening the knob bolt, so that the saw blade can be easily attached and removed. Can be.

(Example of the invention)

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view showing an embodiment of a jigsaw saw blade fixing mechanism of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG.
FIG. 3 is a side view showing an example of a jigsaw to which the present invention is applied.

In the figure, reference numeral 2 denotes a plunger reciprocated in the axial direction by a driving source such as a motor (not shown), 21 denotes a flat portion provided at a lower end portion of the plunger 2, 3 denotes a saw blade, 4 denotes a working pin, and 5 denotes a working pin. Set piece, 51 is a contact surface, 52 is a boss, 6
Is a lever, 61 is a pin contact surface, 62 is a knob bolt contact surface, 7
Is a pin, 71 is a central axis of the pin 7, and 8 is a knob bolt.
At the lower end of the plunger 2, a flat surface 21 serving as a seat for mounting the saw blade 3 is provided in parallel with the axis, and the operation pin 4 is fitted on the opposite side of the flat portion 21. One of the inner surfaces of the set piece 5, which is a piece of a rectangular tube having a substantially rectangular cross section, is smoothed as the contact surface 51 of the saw blade 3, and the opposite side wall of the rectangular tube is provided with a square screw of a knob bolt 8. A boss 52 formed with a square screw groove to be screwed is formed. As shown in FIG. 2, the pin 7 has its axis parallel to the contact surface 51 and straddles the other two walls of the rectangular tube connecting the contact surface 51 and the boss 52.
It is attached in the direction perpendicular to the axis.

As shown in FIG. 1, a lever 6 is swingably attached to the pin 7, and the lever 6 is provided with an operating pin when the distance of the pin 7 from the central axis 71 is 1 and L (L> 1). A pin contact surface 61 that contacts the knob 4 and a knob bolt contact surface 62 that contacts the tip of the knob bolt 8 are provided. The pin contact surface 61 of the lever 6, the knob bolt contact surface 62, and the center axis 71 of the pin 7 are formed so as to be on a straight line.

As shown in FIG. 1, move the knob bolt 8 to the right,
After the upper end of the saw blade 3 is inserted between the flat portion 21 of the plunger 2 and the contact surface 51 of the set piece 5, the knob bolt 8 is moved to the left and tightened. The tightening force of the screw of the knob bolt 8 is transmitted to the pin contact surface 61 of the lever 6, and the lever 6 tries to rotate in the counterclockwise direction, so that the knob bolt contact surface 62 of the lever 6 pushes the working pin 4 to the left and pushes the boss 52. Combined with the pulling force to the left, the saw blade 3 is tightened between the flat part 21 of the plunger 2 and the contact surface 51 of the set piece 5.

Then, the saw blade 3 is tightened with a force L / l times the tightening force of the screw of the knob bolt 8 based on the principle of leverage. To remove the saw blade 3, it is only necessary to slightly move the knob bolt 8 to the right, and the detachment of the saw blade 3 can be performed by a simple operation.

FIG. 3 is a side view showing a state in which the jigsaw saw blade fixing mechanism of the present invention is attached to the jigsaw body 1, and 9 is a base.

〔The invention's effect〕

Since the present invention uses a lever mechanism and a knob bolt together,
A large holding force can be secured with a small tightening force, and the saw blade can be easily tightened and removed by hand, thereby improving workability and operability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a jigsaw saw blade fixing mechanism according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG.
The figure is a side view showing an example of a jigsaw to which the present invention is applied. In the figure, 1 is a jigsaw body, 2 is a plunger, 3 is a saw blade, 4 is a working pin, 5 is a set piece, 6 is a lever,
7 is a pin, 8 is a knob bolt.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23D 51/08-51/14 B27B 19/02-19/09

Claims (1)

(57) [Claims] 1. A jigsaw for attaching a saw blade to a lower end portion of a plunger and transmitting a reciprocating motion along the axial direction of the plunger to the saw blade to cut a material, comprising: a set piece provided at a lower end portion of the plunger;
A lever that pivots around a pin provided on the set piece, a knob bolt that pushes the lever toward the plunger at a position distant from the lever fulcrum, and a saw that is located between the lever fulcrum and the knob bolt and is pushed by the lever and is sawed A working pin acting to fix the blade, wherein the pressing force of the knob bolt against the lever is boosted as a holding force to the saw blade through the working pin to act. Saw blade fixing mechanism.