JPH058004Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a saw machine, especially a reciprocating type saw blade that is attached to a pipe such as a gas pipe or water pipe, and cuts the pipe by rotating the saw blade little by little while reciprocating. Regarding sawing machines.

[Conventional technology]

BACKGROUND ART Reciprocating saws have traditionally been used as simple cutters that are attached to gas pipes and water pipes to cut them at narrow burial sites.

An example of such a reciprocating saw machine is shown in FIGS. 3 and 4. In the figure, the saw machine generally comprises a cutter main body part 10 having a saw blade 11, and a vice part 20 for rotatably holding the main body part 10 and for attaching the whole saw machine to a pipe P. Katsuta body 10
is connected to an external motor 30 via a flexible shaft 40, and the rotational driving force of the motor is converted into reciprocating motion of the saw blade 11 by a power transmission mechanism within the cutter body. The cutter body 10 is the vise body 2
The cutter body is rotatably attached to the cutter body through a rotational shaft (not shown), and the operator can rotate the cutter body around the rotational shaft by holding the grip 13 provided on the cutter body. By moving the blade 11 in the direction across the pipe P (in the direction of the arrow in FIG. 4), the pipe can be cut all around the circumference.

The vice main body 20 has a substantially V-shaped chain 21 and a chain 23. The chain 23 is fixed by placing the chain 21 on the outer periphery of the pipe P, winding the chain 23 around the pipe P, and turning the tightening handle 25. If you tighten the vise body 20,
Therefore, the cutter body 10 can be attached to the pipe. Naturally, one end of the chain 23 is attached to a movable part that is integral with the tightening handle 25 of the vice body 20 and is removable.

The motor 30 can be built into the cutter body 10, but the device should be made smaller in consideration of the risk of explosion due to sparks, especially when cutting gas pipes, and in view of workability in narrow work sites. As shown in the figure, it is provided as a separate body from the cutter body, with the intention of
They are connected via a flexible shaft 40. In this way, the motor 30 can be placed far away. As is well known, the flexible shaft 40 is a rotary shaft that can be bent in any direction, and can transmit the rotation of the motor 30 to the cutter body 10.

[Problem that the invention attempts to solve]

In the reciprocating saw machine as described above, the operator manually rotates the cutter body 10 around the rotary shaft as described above, so the operator must stay by the side until the cutting operation is completed. Furthermore, in the case of buried pipes, large holes must be dug into which workers can fit. Furthermore, when the operator manually operates the cutter, the force to rotate the cutter body is not uniform, resulting in unstable cutting conditions, which can lead to problems such as not being able to obtain a clean cut surface, or damage or bending of the saw blade. There is sex.

The purpose of the present invention is to solve such problems, and to be able to easily and reliably cut pipes with substantially uniform cutting conditions even in a narrow working space, and furthermore, there is no need for the operator to be on site after the work has started. The purpose of the present invention is to provide a reciprocating saw machine.

[Means for solving problems]

In order to achieve the above object, according to the present invention,
A structural feature in which a weight that applies a rotational moment in a predetermined direction within the plane of rotation of the cutter body is detachably attached to the cutter body, and the cutter body is rotated in a predetermined direction by the weight of the weight. It is.

[Effect]

The weight applies a rotational moment to the cutter body by its own weight, which causes the cutter body, and therefore the saw blade, to automatically move in the cross-pipe direction, allowing the saw blade to be fed automatically without the need for an operator.

〔Example〕

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

Figures 1 and 2 show an embodiment of the present invention.
In this figure, parts that are the same as those in FIGS. 3 and 4 are indicated by the same numbers, and their explanations will be omitted.

The greatest feature of the present invention is that the cutter body 10 is provided with a weight 60 that applies a rotational moment within its rotational plane. First, the internal structure of the cutter body 10 will be briefly described.

The cutter body 10 is rotatably and removably attached to the vise body 20 by a rotating support shaft 53 attached to a bracket 51. Katsuta body 1
0 has a housing 55, and a rotary input shaft (first
A shaft 57 is rotatably provided by a bearing 59. A gear 61 is keyed to this shaft 57, and a bearing 63 is attached to the gear 61 to support the housing 5.
Another gear 67 keyed to a second shaft 65 which is rotatably supported by the shaft 5 meshes with the second shaft 65 . A bevel gear 69 is fixed to the inner end of the second shaft 65, and another bevel gear 71 meshes with this. The bevel gear 71 is keyed to a third shaft 75 rotatably supported by the housing 55 by a bearing 73. 3rd axis 7
A disk 77 is fixed to the other end of the disk 5, and an eccentric pin 79 in the form of a bolt is fixed near its outer periphery. The eccentric pin 79 is attached to a groove 8 of a slider 83 fixed to a slide shaft 81 extending parallel to the first shaft 57.
It is calculated within 5. The groove 85 extends in a direction perpendicular to the slide shaft 81 (direction perpendicular to the plane of the paper), so when the disc 77 rotates around the shaft 75, the eccentric pin 79 also moves in an arc around the shaft 75. The eccentric pin 79 is inserted into the groove 8 of the slider 83.
While moving within the slider 83 in its longitudinal direction (direction perpendicular to the slide shaft 81), the slider 83, and therefore the slide shaft 81 integrated therewith, is moved in the longitudinal axis direction X.
It can be moved to . A mounting plate 87 having a screw hole 89 for mounting the band saw blade 11 is fixed to the tip of the slide shaft 81 (lower end in FIG. 1), and the saw blade 11 is attached to the mounting plate 87 by using a screw (not shown), for example.
It is removably fixed. Thus, saw blade 1
1 reciprocates once in the longitudinal axis direction X together with the slide shaft 81 for every rotation of the disk 77.

The power transmission mechanism itself inside the cutter body 10 as described above is well known and is not a direct target of the present invention.

According to the present invention, a blind hole 91 is formed in the cutter body 10 in its rotational plane (a plane perpendicular to the rotational support shaft 53) and extends in a predetermined direction at a certain distance from the rotational support shaft 53. The blind hole 91 extends, for example, in a direction substantially perpendicular to the slide 81. This blind hole 91
A mounting shaft 95 that is mounted in a hole 97 of the weight 60 is inserted inside. The mounting shaft 95 may be fixed to the weight 60 by welding or the like, or may be mounted with its protruding length adjustable by a suitable means such as a screw. A circumferential groove 99 is formed at the tip of the attachment shaft 95, into which the cutter body 10 is inserted.
A one-way clutch 101 provided at the terminal is engaged. Clutch 101 is normally biased into the engaged position by spring 103. Clutch 101 is blind hole 9
A one-way clutch is configured that allows the shaft 95 to be inserted into the blind hole 91 and prevents the shaft 95 from moving in the opposite direction, that is, in the direction of removing the shaft 95 from the blind hole 91. This prevents the cutter from falling off the cutter body 10 when it comes to the lower part. Weight 60
applies a rotational moment determined by the length of the arm from the rotational support shaft 53 to the cutter body 10, and as the saw blade 11 progresses in cutting the pipe P, the cutter body rotates around the rotational support shaft 53 due to the weight of the weight 60. As shown in FIG. 1, it rotates little by little counterclockwise. In FIG. 1, 60' indicates the movement position of the weight 60, which corresponds to the position where the saw blade 11 completes cutting of the pipe P. At this time, even if the weight 60 reaches the 60' position, the one-way clutch 101 prevents the weight from falling off. In addition, the weight 60 is attached to the cutter body 10.
When removing from the clutch 101, use the knob 105 of the clutch 101.
Clutch 101 can be removed from circumferential groove 99 by pulling outward against spring 103.

The weight may be simply a mass, and its shape and material are not limited in any way. In addition, the weight 60
If the grip 60a is formed on the
Handling such as removal will be convenient. or,
By providing several types of weights with different weights, it is possible to replace the weights depending on the diameter and wall thickness of the pipe, for example.

Furthermore, if the handle 55a is also formed in the housing 55 of the cutter body 10, handling of the cutter body 10 will be easier.

As described above, according to the present invention, by simply attaching the weight 60 to the cutter body as necessary, the cutter body can be rotated by the weight of the weight, and the saw blade can be automatically fed in the radial direction. Therefore, according to the present invention, there is no need for the operator to rotate the cutter body, and there is no need for the operator to be nearby once the saw machine of the present invention is set. According to the present invention, since the saw machine receives a rotational force due to the rotational moment determined only by the weight of the weight, the rotational force is always uniform, and there is no room for the operator's skill or force adjustment to interfere. The rotational moment due to the weight can be obtained by changing the size of the weight or by changing the weight 60 of the shaft 95.
It can be set to any desired value by changing the protrusion length (length of the moment arm).

It should be understood that the weight does not necessarily have to be attached directly to the cutter body, but may be mounted anywhere as long as it can apply a rotational moment to the cutter body.

[Effect of idea]

As described above, according to the present invention, the diameter of the saw blade can be determined simply and reliably by simply attaching a weight capable of applying a rotational moment to the cutter body, and is completely unaffected by human factors by the operator. Directional feeding is possible, and therefore pipes can be cut with uniform cutting conditions even in a narrow working space.

[Brief explanation of the drawing]

Fig. 1 is an external view of the saw machine according to the present invention, Fig. 2 is a central sectional view of the saw machine shown in Fig. 1 (however, the weight has been removed), and Fig. 3 is a conventional reciprocating saw. FIG. 4 is an illustrative view showing a completed state of cutting by the saw shown in FIG. 3; FIG. 10...Katsuta body, 11...Saw blade, 20...
Vise body, 30...motor, 40...flexible shaft, 60...weight.

Claims (1)

[Scope of utility model registration request] a cutter main body having a vice part attached to and gripping the pipe to be cut; a saw blade rotatably held in the vice part in a plane perpendicular to the axis of the pipe and reciprocating in the plane of rotation; A reciprocating saw machine having a reciprocating type saw, wherein a weight that applies a rotational moment in a predetermined direction within the rotational plane is detachably attached to the cutter main body, and the cutter main body is rotated in a predetermined direction by the weight of the weight. A reciprocating saw machine characterized by: