JPH065054Y2 - Reciprocating saw - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention is a reciprocating type in which a pipe is cut by rotating the saw blade little by little while reciprocating the saw blade by attaching it to a saw machine, especially a pipe such as a gas pipe or water pipe Regarding the saw machine.

[Prior Art] Conventionally, a reciprocating saw machine has been used as a simple cutter for attaching to and cutting a gas pipe or a water pipe at a narrow burial site or the like.

An example of such a reciprocating saw machine is shown in FIG. In the figure, a saw machine generally has a cutter body portion 1 having a saw blade 11.
0, rotatably holding this and the entire saw machine with a pipe P
And a vise portion 20 for attaching to the.
The cutter body 10 is connected to an external drive unit (built-in motor) 30 via a flexible shaft 40, and the rotational driving force of the motor is converted into a reciprocating motion of the saw blade 11 by a power transmission mechanism in the cutter body. The cutter body 10 is rotatably attached to the vise body 20 via a rotation spindle (not shown). Therefore, an operator holds the grip body 13 provided on the cutter body to move the cutter body around the rotation spindle. By rotating the saw blade 11, the saw blade 11 can be moved in a direction traversing the pipe P (counterclockwise in FIG. 3) to cut the pipe over the entire circumference.

The vice body 20 has a substantially V-shaped jaw 21 and a chain 23. The jaw 21 is placed on the outer periphery of the pipe P, the chain 23 is wound around the pipe P, and the tightening handle 25 is turned to rotate the chain 23. The vice body 20, and hence the cutter body 10, can be attached to the pipe by tightening. Naturally, the chain 2
One end of 3 is attached to a movable part that is integral with the tightening handle 25 of the vise body 20 and is removable.

The drive unit 30 can be incorporated in the cutter body 10, but in consideration of the risk of explosion due to a spark or the like particularly in the case of cutting the gas pipe, and in consideration of workability in a narrow work site, the drive unit 30 For the purpose of downsizing, it is provided as a separate body from the cutter body as shown in the drawing, and the space between them is connected via the flexible shaft 40. This way
It is also possible to place the drive unit 30 far apart.
As is well known, the flexible shaft 40 is a rotary shaft that can be bent in an arbitrary direction, and rotates the motor with the cutter body 10.
You can tell

[Problems to be solved by the invention]

In the reciprocating saw machine as described above, the operator manually rotates the cutter body 10 around the rotation support shaft as described above, but the grip 13 is fixed, that is, the position of the grip 13 is fixed. Due to the non-adjustment, the grip 13 may be completely unusable depending on the position of the cutter attached to the pipe. That is, at a site where another pipe is buried next to or above the pipe to be processed, the cutter body cannot but be attached diagonally or sideways, and the grip 13 is placed below the pipe. There are things that come. In such a case, the grip 13 is completely useless and there is no choice but to grip the cutter body with both hands and directly rotate it with a large force.

Further, in order to rotate the cutter body with one hand with a small force, it is preferable to make the grip 13 as long as possible and increase the arm length of the rotation moment, but as described above, the grip 13 is fixed. It can't be long because it can get in the way. On the contrary, the actual situation is to make the grip as small as possible in consideration of the possibility of getting in the way.

An object of the present invention is to solve the above problems and provide a reciprocating saw machine capable of easily and reliably cutting a pipe with a small force even in a narrow working space.

[Means for solving problems]

The above problems are basically solved by making the position of the actuating lever (grip) adjustable with respect to the cutter body. However, since the actuating lever is a grip for rotating the cutter body, it needs to be integrally connected to the cutter body in the cutting direction. Therefore, the following ideas proposed in the present invention are necessary.

That is, according to the present invention, an operating lever is connected to the cutter body through a one-way rotation transmission clutch, and the operating lever rotates the cutter body in only one predetermined direction and idles in the other direction. Is a structural feature.

[Action]

The operating lever is integrally connected to the cutter body in the cutting direction, and by rotating the operating lever, the cutter body can be rotated to cut the pipe. On the other hand, in the direction opposite to the cutting direction, the actuating lever only idles with respect to the cutter body, so that it can be brought to an arbitrary angular position.

〔Example〕

 Hereinafter, a preferred embodiment of the present invention will be described in detail.

1 and 2 show an embodiment of the present invention, in which the same parts as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

The cutter body 10 has a metal sleeve 121 on the vise body 20.
Is removably connected to one end of a rotary shaft 51 which is rotatably supported by means of a meshing clutch 53. Saw blade 1
1 is fixed to a mounting plate 57 provided on the cutter body 10. The mounting plate 57 is mounted on the tip of a slide shaft (not shown) connected to the drive unit 30 (FIG. 3) by the flexible shaft 40, whereby the saw blade 11 reciprocates in the longitudinal axis direction together with the slide shaft.

An operating lever 63 is connected to the other end of the rotating shaft 51 via a one-way rotating clutch (ratchet) 61. The operating lever 63 can extend in a predetermined direction in a plane parallel to the rotation surface of the saw blade 11 and have a desired length. Operating lever 6
As shown in FIG. 1, the base end of 3 is preferably a mounting member 73 which constitutes one side of the clutch 61 by means of latch means 71.
It is removably fitted into the mounting blind hole 75. The latch means 71 has a latch shaft 72 which is engaged in a circumferential groove 64 formed at the tip of the actuating lever 63, and the latch shaft 72 is slidable in a cylindrical body 77 press-fitted into a boss portion 76 of a mounting member 73. The spring 79 is always urged to the latched position (locked position). This lock can be easily released by pulling the latch shaft 72 upward in FIG. 1 against the spring 79 by the knob 81 at the outer end of the latch shaft 72. That is, the latch shaft 72 causes the operating lever 63 to
Can be easily engaged and disengaged in the mounting hole 75 of the mounting member 73.

The mounting member 73 has a ring body 93 rotatably supported around the rotary shaft 51, and a hollow boss 93 is integrally formed on a part of the ring body 93. A cylindrical body 95 is fixedly provided in the hollow boss 93,
A pawl shaft 97 having a ratchet pawl 100 that constitutes one element of the one-way rotary clutch 61 is slidably fitted into the tubular body 95. The pawl shaft 97 is constantly urged by the spring 99 toward the clutch engagement position.

A ratchet wheel 105, which constitutes the other element of the one-way rotation clutch 61, is rotatably fitted in the hollow bore of the ring body 93.
The ratchet wheel 105 is keyed to the rotary shaft 51. In FIG. 1, the ratchet wheel 105 is rotated in the clockwise direction integrally with the actuating lever 63 by the claw 100, and in the counterclockwise direction, the ratchet wheel 105 has an outer peripheral tooth 105a shaped so as to idle around the ratchet wheel 105. Have. That is, when the actuating lever 63 is rotated in the direction of arrow A in FIG. 1, the claw 100 rotates clockwise together with the mounting member 73, and the rotation is transmitted to the claw wheel 105 so that the rotary shaft 51 and hence the cutter body 10 are rotated in the same direction. Rotate to. When the operating lever 63 is turned in the direction opposite to the arrow A, the claw 100
Rotates together with the mounting member 73 in the same direction (counterclockwise in FIG. 1). At this time, the claw 100 and the outer peripheral teeth 10 of the ratchet wheel 105 are rotated.
Due to the shape as described above with 5a, the ratchet wheel 105 does not rotate, and the nail 100
Spins around the ratchet wheel 105. In addition, this idle wheel 105
In order to prevent whirling, a one-way rotating clutch 111 (FIG. 2), which is exactly the same as the one-way rotating clutch 61 described above, is provided between the rotating shaft 51 and the vise body 20. Note that, in FIG. 2, the claw shaft (corresponding to 97) of the claw 113 corresponding to the claw 100 is provided in a direction having a 90 ° phase difference from the claw shaft 97, and therefore the peripheral structure thereof is not shown, but basically it is not shown. The one-way rotating clutch (ratchet mechanism) 6 shown in FIG.
It can be configured as the same clutch mechanism as 1. Fixed claw 113
The interlocking ratchet wheel 115 (corresponding to the ratchet wheel 105) is keyed to the rotary shaft 51. Thus, the rotating shaft 51 cannot rotate counterclockwise in FIG. 1 by the clutch 111, but can rotate only clockwise. Therefore, the operating lever 63
When the wheel rotates idly, the rotary shaft 51 does not rotate.

The axial movement of the one-way rotation clutch mechanism 111 is the rotation axis 5
It is prevented by a thrust metal 117 and a washer 119 fixed to 1. The washer 119 itself is prevented from moving in the axial direction by a nut 121 screwed into a screw formed at the tip of the rotary shaft 51.

The rotary shaft 51 is hollow, and the shaft 12 of the cutter body 10 is inserted therein. A female screw hole 14 is formed at the tip of the shaft 12, and a bolt 1 that penetrates the rotary shaft 51 is formed therein.
The tip of 6 is screwed in. Therefore, by tightening the bolt 16 with the knob 18 at its tip, the cutter body 1
0 can be integrated with the rotary shaft 51 via the clutch 53.

Moreover, the axial stop of the one-way rotation clutch mechanism 61 is guaranteed by the end plate 19.

Incidentally, 10a (FIG. 1) shows a grip formed on the cutter body 10 to simplify the handling of the cutter body.

According to the present invention, the actuating lever 63 according to the present invention is free to rotate counterclockwise in FIG. 1, so that the actuating lever 63 can be arbitrarily selected according to the space at the work site and the piping condition of other pipes. Can be brought to an angular position of. Therefore, for example, even when the cutter body has to be mounted right beside the pipe, the actuating lever 63 can be brought to a place where work is easy. Further, since the actuating lever 63 can be oriented in any direction in this manner, it does not interfere even if the actuating lever 63 is a long object. Therefore, by lengthening the actuating lever 63 to some extent, the arm length of the rotation moment can be increased. You can turn it with less force.

On the other hand, when the actuating lever 63 is rotated clockwise in FIG. 1, the rotation is surely transmitted to the rotary shaft 51, and the saw blade 1
1, the pipe P can be cut.

[Effect of device]

As described above, according to the reciprocating saw machine of the present invention, the pipe can be easily and reliably cut with a small force even in a narrow working space.

[Brief description of drawings]

FIG. 1 shows a main part of a saw machine according to the present invention.
FIG. 2 is a sectional view taken along line I-I of FIG. 2, FIG. 2 is a sectional side view of a main part of the saw machine shown in FIG. 1, and FIG. 3 is an external view showing a working state of a conventional reciprocating saw machine. 10 ... Cutter body, 11 ... Saw blade, 20 ... Vise body, 61 ... One-way rotation clutch, 63 ... Actuating lever.

Claims (1)

[Scope of utility model registration request] 1. A vise part attached to and gripping a pipe to be cut, and a saw blade rotatably supported by the vise part in a plane perpendicular to the pipe axis and reciprocally movable in the plane of rotation. A reciprocating saw machine having a cutter main body portion having an operation lever, the operation lever being connected to the cutter main body portion via a one-way rotation transmission clutch, the operation lever rotating the cutter main body portion only in one predetermined direction. Reciprocating saw machine characterized by tightness and idling in the other direction.