JPH0760538A - Mounting structure for base in cutting tool - Google Patents

Abstract

PURPOSE:To easily and surely perform tightening and fixing of a tool main unit and a base. CONSTITUTION:A gear housing 2 is connected to h base 7 by a connecting bolt 8, and under the base 7, a clamp plate 12, having a contact surface 12b agreeing with the back surface of a slide contact part 10, is arranged, to form a stepped part 14 in a back surface 13 of this clamp plate. The connecting bolt 8, passing through a through hole 12a, slide hole 11 of the base 7 and a mounting hole 9b in a curved recessed part 9 of the gear housing 2 from the back surface 13 of the clamp plate 12, is protruded to a rear end of the curved recessed part 9, and a nut secured to an operating lever 20 is screw- mounted on an end part of this connecting bolt. Further in a head part 8a of the connecting bolt 8 in the back surface of the clamp plate 12, a ring plate 15 is fitted, and in the stepped part 14, a retaining plate 16, provided between end parts 12c, 12c in both sides of the clamp plate 12, is screw-mounted thereon by a screw 17 and a washer 18, to press the front of the ring plate 15 by a point end part 16a of this retaining plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to attachment of a tool body in a cutting tool such as a jigsaw and a base provided so as to be movable and tiltable with respect to the tool body and abutting a workpiece to guide movement of the tool body. It is about structure.

[0002]

2. Description of the Related Art In a cutting tool, the above-mentioned base is shown in Japanese Utility Model Laid-Open No. 4-54801 and in the actual open type Sho 60-18700.
As is known in Japanese Patent Publication No. 2, the bolt is usually bolted to the tool body, and when changing the position or angle of the base with respect to the tool body, the bolt is temporarily loosened to move the base to a predetermined position or posture. It is necessary to tilt and re-tighten the bolts again.

[0003]

In the above conventional bolt connection, it is necessary to re-tighten the bolts with a screwdriver or the like every time the position or angle of the base is changed, and the base is narrow from the back side. Since the bolt is screwed into the space, its operation becomes more troublesome. Further, it is difficult to always maintain a proper tightening amount by tightening with bolts, and if the tightening amount is too short and the tightening amount is still insufficient, the position and angle of the base may shift during cutting work.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a mounting structure in which the base can be easily moved and tilted even if it is connected by a bolt, and the base can always be fixed with a fixed tightening amount. The structure is such that a base provided with a slide hole in a contact surface with the tool body is arranged below the tool body, and the base and the tool are connected by a connecting member consisting of a bolt and a nut member penetrating the slide hole. The operation lever is fixed to the bolt head or the nut member located on the tool body side by connecting with the body, and the base can be tightened and fixed to the tool body by the rotation operation of the operation lever. Is provided with a lock member for restricting the rotation of the nut member or the head of the bolt at an arbitrary position.

[0005]

When the position or the angle of the base is changed, the operating lever is rotated to release the tightening, the base is set to the predetermined position or posture, and then the operating lever is tightened again. At this time, since the rotation of the bolt head or the nut member of the connecting member is restricted by the lock member from the back side of the base, the tightening position by the operation lever set to an arbitrary position does not change, and the tightening position is always constant. The coverage is obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a jigsaw will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a jigsaw main body, a motor housing 3 having a built-in motor is attached to the rear of a gear housing 2 in which a conversion mechanism is provided, a head cover 4 is fitted on the upper portion of the gear housing 2, and a front lower portion. A blade 6 is attached to the blade holder 5 which protrudes to and reciprocates in the vertical direction. Reference numeral 7 is a base installed below the gear housing 2 in order to guide the movement of the jigsaw body 1 by slidingly contacting the upper surface of the work. Is formed, and the sliding contact portion 10 has an arch-shaped cross section that matches the curved recess 9 at the lower end of the gear housing 2 exposed below the head cover 4. The gear housing 2 and the base 7 are connected from below the base 7 by a connecting bolt 8 penetrating the slide hole 11. As shown in FIGS. 1 and 2, a kamaboko-shaped clamp plate 12 is disposed below the base 7 and has a contact surface 12b that matches the rear surface of the sliding contact portion 10 of the base 7 and is slidable forward, backward, leftward, and rightward. A step portion 14 is formed on the back surface 13. The connecting bolt 8 penetrates the through hole 12a provided in the back surface 13 of the clamp plate 12, the slide hole 11, and the mounting hole 9b of the curved concave portion 9 and projects to the rear end of the curved concave portion 9, and the end portion thereof is operated. A nut 21 fixed to the tip of the lever 20 is screwed. Further, the back surface 13 of the clamp plate 12
A ring plate 15 having a square hole 15a that fits into the head portion 8a is fitted to the head portion 8a of the connecting bolt 8 exposed to the outside. Between the extended side ends 12c, 12c and the screw 1
7, screwed to the clamp plate 12 by the washer 18,
The tip portion 16a presses the half surface of the ring plate 15. Half face of the ring plate 15 and the restraining plate 1
The back side of the tip portion of 6 is anti-slip processed, and the ring plate 1
5 is firmly regulated, and it is designed to prevent its withdrawal and rotation. Reference numeral 19 is a base plate that closes the bottom surface of the base 7.

In the base mounting structure configured as described above, when the base is first assembled, the connecting bolt 8 is attached to the through hole 12a of the clamp plate 12, the slide hole 11, and the curved concave portion 9 from the back side of the base 7 as described above. Through the mounting hole 9b, and the nut 21 of the operation lever 20 is screwed. At that time, while keeping the operating lever 20 in the lock position A in FIG. 3, the connecting bolt 8 is tightened with a screwdriver to fix the curved concave portion 9 of the gear housing 2 and the sliding contact portion 10 of the base 7. The ring plate 1 is attached to the head 8a of the connecting bolt 8.
5 is fitted and, as shown in FIG.
6a is brought into contact with the half surface of the ring plate 15 and screwed with the screw 17. Then, the gear housing 7 and the base 7 can be clamped and unlocked by rotating the operation lever 20, and the connecting bolt 8 is prevented from rotating by the fixed ring plate 15. , The tightening amount of the nut 21 of the operating lever 20 and the connecting bolt 8 to the gear housing 2, the base 7, and the clamp plate 12, that is, the setting of the lock position A and the unlock position B does not change, and the operating lever 20 is always constant. It can be rotated with the stroke. When changing the position or angle of the base 7,
When the operation lever 20 is rotated to the unlocked position B, the tightening between the gear housing 2 and the base 7 is released,
If the base 7 is moved from that state to an arbitrary position or tilted as shown by the chain double-dashed line in FIG. 3 and the operating lever 20 is rotated again to the lock position A at that position, the base is similar to the above. 7 is fixed by tightening. As described above, according to the present embodiment, the base can be easily tightened and fixed only by operating the operation lever 20, and since the tightening amount is always appropriate, a tool such as a screwdriver is not necessary. Of course, there is no need to operate the bolts from the back side of the base, and the reliability when fixing is very high.

According to the above-described embodiment, since the ring plate 15 for fixing the connecting bolt 8 for setting the tightening position is prevented from rotating by the holding plate 16 which is a separate member, the connecting bolt 8 and the operating lever 20 are connected to each other. No matter how the setting of the first tightening position of the
It can be fitted on the back surface and can be always restrained by the restraining plate 16. In the above embodiment, the connecting bolt is penetrated from the back side of the base and the nut of the operation lever is screwed to the tip of the gear housing side. However, conversely, the connecting bolt is penetrated from the gear housing side to the base, Even if the operation lever is fixed to the head of the machine, the nut member is screwed to the end of the connecting bolt, and the ring plate is fitted to the nut member, the operation lever can be tightened by the same operation as above. Is. Further, in the above embodiment, the connection bolt 8 for setting the tightening position is fixed by the ring plate 15 and the pressing plate 16. However, if the ring plate 15 can be fixed at an appropriate position, for example, the ring plate 15 Non-slip serrations are respectively provided between the clamp plate 12 and the back surface 13 of the clamp plate 12, and a long hole is formed in the ring plate 15 in the circumferential direction, and the ring plate 15 is bolted to the clamp plate 12 through the long hole. The design can be appropriately changed within a range not departing from the gist of the present invention, such as screwing by means such as the above.

[0009]

As described above, according to the present invention, the base can be easily locked and unlocked only by rotating the operation lever, and the base can be fixed with a necessary and proper tightening amount at all times. The work of changing the position and angle of the base is greatly simplified, the reliability of the base with respect to the tool body during cutting work is high, and the sense of unity is improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a jigsaw to which the present invention has been applied.

FIG. 2 is an explanatory diagram showing details of a base mounting structure in the jigsaw.

FIG. 3 is an explanatory diagram showing a base mounting operation in the jigsaw.

FIG. 4 is an explanatory diagram showing a base mounting operation in the jigsaw.

[Explanation of symbols]

1 ... Jigsaw body, 2 ... Gear housing, 3 ... Motor housing, 4 ... Head cover, 5 ... Blade holder, 6 ... Blade, 7 ... Base, 8 ... Connecting bolt, 9 ... 10 ... Sliding contact part, 11 ... Slide hole, 12 ... Clamp plate, 13 ... Back surface, 14 ...
・ Steps, 15 ・ ・ Ring plates, 16 ・ ・ Retaining plates, 1
7 ・ ・ Screw, 18 ・ ・ Washer, 19 ・ ・ Base plate, 20 ・ ・ Operating lever, 21 ・ ・ Nut.

Claims (2)

[Claims] 1. A base having a slide hole on a contact surface with the tool body is arranged below the tool body, and the base and the tool body are connected by a connecting member formed of a bolt and a nut member penetrating the slide hole. The operation lever is fixed to the bolt head or the nut member located on the tool body side by connecting, and the base can be tightened and fixed to the tool body by the turning operation of the operation lever, and the nut is on the back side of the base. A base mounting structure for a cutting tool, comprising a lock member for restricting rotation of a member or a bolt head at an arbitrary position. 2. The connecting member penetrates the base and the tool body through an intermediate member that is in sliding contact with the back surface of the base, and the lock member is fitted to a bolt head or a nut member of the connecting member. The mounting of the base in the cutting tool according to claim 1, further comprising: a ring-shaped plate that is attached to the intermediate member, and a regulation plate that is attached to the intermediate member and abuts against the plate to regulate movement of the plate. Construction.