JPH0537416U - Support mechanism of operating rod in reciprocating tool - Google Patents

Abstract

(57) [Summary] [Purpose] The support part of the operating rod is not worn, and replacement work such as spare blades is easy. A reciprocating operation rod 20 is slidably supported in a guide tube 28 at an intermediate portion thereof, and an upper surface of the operation rod 20 is in contact with a pulley at a front portion thereof. Even if upward stress is exerted by the force pressing against the object to be cut, it can be received by the pulley.
At this time, the pulley rotates left and right following the reciprocating movement of the operating rod 20. Since the operating rod 20 reciprocates along the groove of the pulley, the saw blade does not swing left and right. Further, since the operating rod 20 can smoothly reciprocate in the axial direction by the second bearing 26 fitted in the guide groove 22 of the operating rod 20, and the movement in the direction perpendicular to the axial center is restricted, Almost no vertical swing of the operating rod 20 occurs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a support mechanism of an operating rod in a reciprocating tool.

[0002]

[Prior art and its problems]

 Reciprocating tools, in which a tool such as a saw blade or a rasp is attached to the tip of the operating rod, generally adopt a type in which the rotating motion of the motor is converted into the reciprocating motion of the operating rod by an eccentric mechanism. In this type of reciprocating tool, the mechanism that most often employs a mechanism in which the operating rod is supported by two guide cylinders made of wear-resistant alloy at the front and rear in the reciprocating direction, and the guide cylinders are used as guides for sliding and supporting. .

However, when the reciprocating tool is continuously used, upward force is exerted on the saw blade or the like due to the force of pressing the saw blade or the like against the object to be cut, so that the supporting portion, particularly the front guide cylinder friction force is increased. As a result, the guide cylinder wears due to long-term use of the tool, and as a result, the linear motion balance of the operating rod is disturbed and vibration occurs, which may cause a problem of damage to the tip end device. In addition, this vibration causes a problem such as saw blades and other instruments that cannot be accurately machined.

Therefore, there is also known a type in which a stress applied in an upward direction when a reciprocating tool is used is provided with a stopper on the back of the saw blade to absorb the stress. However, in the case of this type of reciprocating tool, the saw blade cannot be replaced unless the size of the saw blade is within a predetermined range, and the replacement work is complicated and inefficient.

Furthermore, in the rotary saws disclosed in JP-A-63-74516 and JP-A-1-159123, bearings are provided on opposite side surfaces of a reciprocating rod (spindle) having a rectangular cross section. A supporting mechanism is known in which the other side surfaces are supported by the inner wall surface of the body casing and guided by the inner wall surface of the body casing. However, the support mechanism disclosed in the above publication has a considerably complicated structure.

[0006]

[The purpose of the device]

 However, the present invention reduces the influence of the operating rod on the supporting portion even if it is continuously used for a long period of time, so that the supporting portion does not wear, and the replacement blade replacement work is easy and simple. An object of the present invention is to provide a support mechanism for an operating rod in a reciprocating tool having a different structure.

[0007]

[Device configuration]

 In order to achieve the above object, the present invention reciprocates a saw blade, a filer or the like attached to the front end portion of the operating rod by an eccentric mechanism connected to the rear end portion of the operating rod, and the upper surface of the operating rod. In the support mechanism of the operating rod in the reciprocating tool, in which the first bearing which is in contact with the first bearing is disposed on the mounting side of the instrument and the intermediate portion between the first bearing and the eccentric mechanism is supported by the guide tube, It is characterized in that A guide groove extending in the axial direction of the operating rod is formed on the side surface of the rear end portion of the operating rod, and the second bearing is slidably fitted in the groove.

[0008]

[Action]

 The operating rod that reciprocates is slidably supported in the guide tube at its intermediate portion, and the upper surface of the operating rod contacts the pulley at the front portion, so the force that presses the saw blade against the object to be cut when the tool is operated. Even if upward stress is applied, it can be received by the pulley. At this time, the pulley rotates left and right following the reciprocating movement of the operating rod. Since the operating rod reciprocates along the groove of the pulley, the saw blade does not swing left and right. That is, this support mechanism plays a role of supplementing the linear movement of the operating rod.

Further, since the second rod fitted in the guide groove of the operating rod can smoothly reciprocate in the axial direction, the movement of the operating rod is restricted in the direction perpendicular to the axial center. The vertical deflection of the operating rod hardly occurs.

[0010]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the reciprocating tool body 10 in which a part of the front cover 11 is cut away, and FIG. 2 is a sectional plan view taken along line II-II of FIG. In the following description of the embodiments, the connection side of the saw blade 12 will be referred to as the front portion, front portion, front end portion, etc., and the handle 13 side will be referred to as the rear portion, rear portion, rear portion, etc.

In FIG. 2, the rotation of the motor 14 built in the main body 10 is transmitted to the gear 17 fitted to the drive shaft 16 pivotally supported by the casing 15, and the shaft end of the drive shaft 16 near the front cover 11 is transmitted. An eccentric shaft 19 for projecting the operating rod 20 back and forth is projectingly provided on this.

As shown in FIG. 3, a lateral groove 22 extending in the axial direction is formed on the rear side surface of the operating rod 20 having a rectangular cross section, and a longitudinal groove perpendicular to the axial direction is formed on the opposite side surface of the lateral groove 22. The outer ring of the ball bearing 26 externally fitted to the bearing bolt 25 fixed to the inside of the front cover 11 is fitted in the lateral groove 22, and the needle externally fitted to the eccentric shaft 19 is fitted in the vertical groove 24. The bearing 18 fits. In FIG. 2, reference numeral 28 is a guide cylinder made of a wear-resistant alloy for guiding the operating rod 20, and supports the intermediate portion of the operating rod 20. The saw blade 12 is fastened to the front end of the operating rod 20 with bolts 29, 29. Reference numeral 30 is a dustproof felt.

In FIG. 1, a ball bearing ring 36 is provided in front of the operating rod 20 and is in contact with the upper surface of the operating rod 20. The ball bearing 36 is fitted onto the support pin 35, and the pin 35 is axially supported by the front cover 11 and the casing 15. As shown in FIG. 4, a pulley 40 having a V groove 41 is fitted to the outer ring of the ball bearing 36. In this case, it is preferable to taper the upper surface of the operating rod 20. On the contrary to the above, both end surfaces of the outer periphery of the pulley 40 may be tapered to form a V groove on the upper surface of the operating rod 20.

Next, the operation of the above embodiment will be described. The rotational movement of the motor 14 is converted into a linear movement via the eccentric mechanism, and causes the operating rod 20 to reciprocate. The operating rod 20 is slidably supported in the guide cylinder 28 at its intermediate portion, and the upper surface of the operating rod 20 is in contact with the pulley 40 at the front portion, so that the saw blade 12 is cut when the tool is operated. Even if an upward stress is exerted by the force pressing the object, it can be received by the pulley 40. At this time, the pulley 40 rotates left and right following the reciprocating movement of the operating rod 20. Since the operating rod 20 reciprocates along the slope of the V groove 41 of the pulley 40, the saw blade 12 does not swing left and right.

Further, since the outer ring of the ball bearing 26 fitted in the lateral groove 22 of the operating rod 20 is rotatable, the operating rod 20 can smoothly reciprocate in the axial direction, but is perpendicular to the axial center. Since the movement in the direction is restricted, the vertical deflection of the operating rod 20 hardly occurs.

[0016]

[Effect of the device]

 According to the support mechanism of the operating rod in the reciprocating tool according to the present invention, the supporting portion does not wear due to friction even when the reciprocating tool is used continuously and for a long time. In addition, the operating rod support mechanism is simple, and replacement work such as spare blades is easy. Further, in order to prevent lateral deflection of the operating rod, damage to the cutting tool is reduced and operability is improved. As a result, the sharpness of the tool is improved, but there is also the effect that accurate machining can be performed.

[Brief description of drawings]

FIG. 1 is a front view of a reciprocating tool with a front cover partially cut away.

FIG. 2 is a sectional plan view taken along line II-II of FIG.

FIG. 3 is a perspective view showing a rear end portion of an operating rod 20.

FIG. 4 is a sectional side view taken along line IV-IV in FIG.

[Explanation of symbols]

 19 Eccentric shaft 20 Operating rod 22 Horizontal groove (guide groove) 24 Vertical groove 26 Ball bearing (second bearing) 28 Guide tube 36 Ball bearing (first bearing) 40 Pulley

Claims (2)

[Scope of utility model registration request] 1. A first bearing, which is in contact with the upper surface of the operating rod, is reciprocated by an eccentric mechanism connected to the rear end of the operating rod, such as a saw blade and a file attached to the front end of the operating rod. In the support mechanism of the operating rod in the reciprocating tool which is disposed on the mounting side of the tool and which supports the intermediate portion of the first bearing and the eccentric mechanism with the guide tube, the pulley is fitted to the first bearing. Support mechanism for operating rod in reciprocating tools. 2. A guide groove extending in the axial direction of the operating rod is formed on a side surface of a rear end portion of the operating rod, and a second bearing is slidably fitted in the groove. The support mechanism according to item 1.