JPH0540890Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a portable cutting machine for cutting reinforcing bars, metal pipes, etc., and particularly a portable cutting machine with a cutting oil supply device that supplies cutting oil. It is related to.

(Prior Art) Conventionally, portable cutting machines used to cut reinforcing bars, iron pipes, etc. have generally been of the type equipped with a dry cutting wheel or a tip saw that does not supply cutting oil. Therefore, the things that can be cut with this dry type cutting machine are limited to thin metals such as reinforcing bars, water pipes, and gas pipes, and only thick metals (e.g.
It was difficult to cut 50φ aluminum rods, etc.

Therefore, when cutting thick metal, a cutting machine equipped with a wet metal saw configured to supply cutting oil to the cutting blade via a cutting oil supply path using an electric pump, It was common to use a cutting machine equipped with a rotary band saw.

(Problems to be solved by the invention) However, since the wet cutting machine is equipped with an electric pump etc. for supplying cutting oil, the electrical configuration becomes complicated and the whole machine becomes large.
It had gained a lot of weight. For this reason, it is inconvenient to carry it to a work site and use it to cut thick metal. Therefore, a wet cutting machine with portability has been desired.

This idea was made in view of the above-mentioned circumstances, and is a portable cutter with a cutting oil supply device that can improve the cutting performance of the cutter by supplying cutting oil with a simple configuration without impairing the portable performance. The purpose is to provide equipment.

Structure of the invention (means to solve the problem) In order to achieve the above purpose, this invention:
In particular, the end opening of the cutting oil supply path is mounted on a movable frame that is displaced in the vertical direction so as to face the cutting blade of a rotary cutter, and the rotary cutter cuts the supporting position of the reservoir with respect to the base. position, and the outlet of the reservoir is higher than the end opening when the rotary cutter is in the retracted position. The configuration is such that the lower position is the lower position.

(Function) Therefore, when the movable frame is moved and the rotary cutter is placed in the retracted position, the end opening of the cutting oil supply path is located above the outlet of the storage tank, so the cutting Cutting oil is not fed by gravity from the reservoir to the cutting blade of the rotary cutter via the oil supply path.

On the other hand, by rotating the rotary cutter and arranging the rotary cutter at a cutting position based on the movement of the movable frame, the object to be cut is cut by the cutting blade. At this time, as the rotary cutter moves to the cutting position, the outlet of the storage tank is located above the end opening of the cutting oil supply path, so the oil is removed from the storage tank through the cutting oil supply path. Cutting oil is fed by gravity to the cutting blade.

(Example) Hereinafter, an example embodying this invention will be described in detail based on FIGS. 1 to 5.

As shown in FIGS. 1 and 2, the portable cutting machine 1 includes a base 2, and the base 2 has a clamping tool ( (not shown) is provided, and an elongated through hole 2a penetrating in the vertical direction is provided. or,
A bearing stand 3 having a pair of shaft supports 3a is mounted on the base 2.
is installed protrudingly. A movable arm 4 as a movable frame having a handle 4a at the tip is disposed between the shaft supports 3a.
is rotatably supported via a support shaft 5 at its base end.

Further, the support shaft 5 is fixed to the movable arm 4 so as to be able to rotate integrally with the movable arm 4, and as shown in FIG. 2, extends to one side through one of the shaft supports 3a.
A recess 4b is formed at the base end of the movable arm 4,
A coil spring 6 is provided on the support shaft 5 passing through the recess 4b, and both ends of the coil spring 6 are engaged with the recess 4b and the bearing stand 3, respectively. Based on the spring force of the coil spring 6, the movable arm 4 is always held at the position shown by the solid line in FIGS.

A cutter cover 7 having a substantially semicircular shape is attached to the middle portion of the movable arm 4, and a motor cover 8 for accommodating a drive motor (not shown) is attached. There is a pipe joint 9 on the outer wall of the cutter cover 7.
is attached, and one end of its passage 9a as a terminal opening communicates with a through hole 7a provided on the outer wall of the cutter cover 7, as shown in FIG. or,
A rotary cutter 10 having a plurality of cutting blades 10a on its outer periphery is rotatably disposed inside the cutter cover 7 and is driven and connected to a drive motor. Approximately half of the rotary cutter 10 is covered with a cutter cover 7. The cutter cover 7 also has a rotary cutter 10 exposed from the cover 7.
A protective cover 11 is provided to cover a portion of the blade and ensure safety during cutting operations.

When the movable arm 4 is placed at the solid line position in FIG. 1, the rotary cutter 10 is placed at a retracted position away from the workpiece W supported on the base 1. On the other hand, the movable arm 4 is connected to the coil spring 6.
By being rotated in the direction of arrow X in FIG. 1 against the spring force of
It is switched to a cutting position where the workpiece W to be cut is cut near the position indicated by the dotted chain line. Further, at the cutting position, the rotary cutter 10 is fitted into the through hole 2a of the base 2.

The basic configuration described above is the same as that of a conventionally used dry type portable cutting machine.

Next, the configuration of the cutting oil supply device will be described. A support frame 12 is provided on the base 2, adjacent to the bearing stand 3, and extending upward. A tank 13 serving as a storage tank for cutting oil is supported and fixed at the upper end of the support frame 12. An oil filler port 13a for injecting cutting oil into the tank 13 is provided on the upper wall of the tank 13 to project upward, and a cap 14 is removably attached to the oil filler port 13a. Further, the cap 14 is provided with an air hole (not shown) for ensuring air circulation to the inside of the tank 13. Furthermore, a discharge port 13b is provided on the lower wall of the tank 13 and projects downwardly for guiding the cutting oil to the outside based on gravity.
Further, one end of an oil supply hose 15 is connected to the outlet 13b, and a handle 16 is provided in the middle of the hose 15 to direct the flow of cutting oil flowing down from the outlet 13b.
A main valve 16 is provided for opening and closing based on the rotational operation of a. The support position of the tank 13 with respect to the support frame 12 is determined by the rotary cutter 1.
When the rotary cutter 10 is in the retracted position, the outlet 13a is in a lower position than the pipe fitting 9, whereas when the rotary cutter 10 is in the cutting position, the outlet 13b is in an upper position than the pipe fitting 9. supported in position.

A valve case 17 is supported and fixed on the side wall of the support frame 12, and as shown in FIG.
7 has a pair of bearing walls 17a extending downward.
is provided. As shown in FIGS. 4 and 5, there is a passage 1 penetrating vertically inside the valve case 17.
8 is provided. The passage 18 is the upper large passage 1
8a, the lower small path 18b, and both 18a, 1
8b and the oblique portion 18c.
A pipe joint 19 to which the other end of the refueling hose 15 is connected is screwed onto the opening side of the large path 18a. Further, an operating pin 20 is disposed within the small path 18b so as to be slidable in the vertical direction. Actuation pin 2
An O-ring 21 for preventing oil leakage is provided on the O-ring 21, and the lower end of the O-ring 21 protrudes outward from the opening side of the small path 18b. Further, a support portion 20a is provided at the upper end of the operating pin 20, extending into the large path 18a and having a smaller diameter than the small path 18b. Then, within the large path 18a, the support portion 20
On a, there is a diagonal portion 18 for closing the passage 18.
An on-off valve 22 that can be engaged with c is fixed.

Further, a compression spring 23 is interposed between the on-off valve 22 and the pipe joint 19, and the on-off valve 22 is opened based on the spring force.
is always biased in the direction of engagement with the oblique portion 18c. Further, a pipe joint 25 is attached to the valve case 17 so as to extend laterally and on the opening side of the small path 24 . One end of a refueling hose 26 is connected to the pipe joint 25, and the other end of the hose 26 is connected to a pipe joint 9 on the cutter cover 7. Note that a cutting oil supply path is constituted by the oil supply hose 15, the valve case 17, the oil supply hose 26, and the like.

As shown in FIGS. 2, 4, and 5, one end portion of a support shaft 5 extending through the shaft support 3a is provided through both bearing walls 17a of the valve case 17. Further, on the support shaft 5 between the two bearing walls 17a, there is a cam body 2 having a large diameter cam portion 27a and a small diameter cam portion 27b on the outer periphery.
7 is fixed to the cam body 27, and the lower end of the operating pin 20 is engaged with the outer periphery of the cam body 27. When the main stopper 16 is open and the rotary cutter 10 is placed in the retracted position, the operating pin 20 is inserted into the small diameter cam portion of the cam body 27, as shown in FIG.
7b, and based on the spring force of the compression spring 23, the on-off valve 22 is pressed against the oblique portion 18c, the passage 18 is closed, and the flow of cutting oil flowing down from the tank 13 is cut off. On the other hand, as the rotary cutter 10 is switched to the cutting position based on the rotation operation of the movable arm 4, the support shaft 5 is rotated together with the movable arm 4, and the cam body 27 is moved in the direction of the arrow Y in FIG. is rotated to As a result, as shown in FIG. 5, the actuating pin 20 engages with the large-diameter cam portion 27a of the cam body 27, and the actuating pin 20 is pushed upward against the spring force of the compression spring 23, opening/closing. Valve 22 is oblique part 18c
The passageway 18 is opened apart from the passageway 18. Cutting oil is then allowed to flow from the passage 18 to the passage 24.

At this time, the pipe joint 9 on the cutter cover 7 is placed at a lower position than the outlet 13b of the tank 13, so the cutting oil flowing down from the outlet 13b flows through the oil supply hose 15, valve case 17, and oil supply hose 26. It is fed by gravity to the pipe joint 9 through the hole 7a, and is supplied to the cutting blade 10a through the through hole 7a. Note that the supporting shaft 5, the cam body 27, and the operating pin 20 constitute an interlocking member.

Therefore, this cutting machine 1 has a cutting blade 10a of a rotary cutter 10, unlike a normal dry type portable cutting machine.
This device is equipped with a cutting supply device for supplying cutting oil to the cutting blade 10, and the cutting oil is simply fed by gravity to the cutting blade 10 without the need for a special electric pump or the like.
It is designed to supply to a. Therefore, a special electric pump does not complicate the electrical configuration, increase the overall size, or increase the weight. As a result, the portable cutting machine can be easily transported and used at a work site without any loss in its inherent portability.

To use this cutting machine 1 at a work site, first, fill the tank 13 with cutting oil, open the main valve 16, and open the base 2.
A workpiece W to be cut is held thereon, and the rotary cutter 10 is rotated based on the operation of the drive motor. In this state, as shown in FIG. 4, the operating pin 20 is engaged with the small diameter cam portion 27b of the cam body 27,
The passage 18 is closed. Also, as shown by the solid line in FIG. 1, when the rotary cutter 10 is in the retracted position, the pipe joint 9 is closer to the tank 13.
Since the position is above the outlet port 13a, cutting oil is not fed by gravity from the tank 13 side to the pipe joint 9 via the oil supply hose 15 or the like. Therefore, the cutting oil that has flowed down from the tank 13 through the oil supply hose 15 to the large path 18a of the valve case 17 is blocked from flowing to the small path 18b, and the cutting oil 10a is cut off from flowing to the small path 18b.
supply has been stopped.

Next, the movable arm 4 is rotated in the direction of arrow X against the spring force of the coil spring 6, and the rotary cutter 10
When the cam body 27 is switched from the retracted position to the cutting position, the cam body 27 is rotated in the direction of the arrow Y in conjunction with the rotation of the rotary arm 4, and the actuating pin 20 is engaged with the large diameter cam portion 27a. is pushed up, and the on-off valve 22 is pushed up to open the passage 18.
Also, as shown by the two-dot chain line in FIG. 1, when the rotary cutter 10 is in the cutting position, the tank 1
Since the outlet port 13a of No. 3 is located above the pipe joint 9, cutting oil is fed by gravity from the tank 13 side to the pipe joint 9 via the oil supply hose 15 and the like. As a result, the cutting oil that has flowed down to the large path 18a flows to the small path 18b, and is fed by gravity to the cutting blade 10a via the passage 24, the oil supply hose 26, and the like. As a result, the object W to be cut can be cut by the wet rotary cutter 10 by supplying cutting oil to the cutting blade 10a.

After cutting the workpiece W, the movable arm 4 is rotated in the opposite direction of the arrow X following the spring force of the coil spring 6, and the rotary cutter 10 is returned to the retracted position. At this time, as the operating pin 20 engages with the small diameter cam portion 27b of the cam body 27, the operating pin 20 is pushed down by the compression spring 23, and the passage 18 is reclosed by the on-off valve 22. As a result, the supply of cutting oil to the cutting blade 10a is stopped.

As mentioned above, in this embodiment, the cutting blade 10a
Since cutting oil can be supplied to the wet rotary cutter 10 to cut the workpiece W, the cutting performance of the rotary cutter 10 can be improved and even thick metal rods can be easily cut. Furthermore, cutting oil can be supplied in conjunction with the switching arrangement of the rotary cutter 10 from the retracted position to the cutting position, and after cutting, cutting oil can be supplied in conjunction with the arrangement in which the rotary cutter 10 is returned to the retracted position. Supply can be stopped. As a result, in order to control the supply of cutting oil, there is no need to provide a valve or the like on the cutting oil supply path and manually operate it, which is troublesome.

Note that this invention is not limited to the above-described embodiment; for example, a movable frame is supported so as to be movable in the vertical direction with respect to a base, and an on-off valve is opened and closed in conjunction with the vertical movement of the movable frame. A part of the configuration may be changed as appropriate without departing from the spirit of the invention, such as configuring it to operate, omitting the main stopper 16, or changing the mounting position of the pipe joint 9 to the cutter cover 7. It can also be carried out.

Effects of the invention As detailed above, according to this invention, a gravity feed method is adopted as the cutting oil supply method, eliminating the need for electric pumps, etc., which can make the equipment complicated, bulky, and heavy. The support position of the storage tank is determined without compromising portability and taking into consideration the relative positional relationship between the end opening of the cutting oil supply path and the outlet of the storage tank when the rotary cutter is in the cutting position or the retreat position. With just a simple configuration of specifying , an excellent effect is achieved in that cutting oil can be reliably fed by gravity to the cutting blade only when the rotary cutter moves to the cutting position.

[Brief explanation of the drawing]

Fig. 1 is a front view of a portable cutting machine showing an embodiment of this invention, and Fig. 2 is a side view thereof.
Figure 3 is a partially cutaway front view of the cutter cover, Figure 4
5 and 5 are partially cutaway front views showing the operation of the on-off valve. 1... Portable cutting machine, 2... Base, 4... Movable arm as a movable frame, 10... Rotating cutter,
10a...Cutting blade, 13...Tank as a storage tank, 15, 26...Oil supply hose, 17...Valve case (15, 17, 26, etc. constitute a cutting oil supply path), 5... Support shaft, 20... Operating pin, 27
... cam body (5, 20, 27 constitute interlocking members), W... object to be cut.

Claims (1)

[Claims for Utility Model Registration] A rotary cutter 10 having a plurality of cutting blades 10a on the outer periphery is rotatably provided on a movable frame 4 which is supported so as to be vertically displaceable with respect to a base 2. The rotary cutter 10 is configured to be switched between a cutting position for cutting the workpiece W and a retreat position for separating from the workpiece W based on the movement of the workpiece W, and the base 2 is equipped with cutting oil. Storage tank 13
from the storage tank 13 to the rotary cutter 10
In the portable cutting machine 1 provided with cutting oil supply passages 15, 17, 26, etc. for supplying cutting oil to the cutting blade 10a, the end openings 9a of the cutting oil supply passages 15, 17, 26, etc. Rotating cutter 1 against movable frame 4
0 cutting blade 10a,
The support position of the storage tank 13 with respect to the base 2 is set so that the outlet port 1 of the storage tank 13 is lower than the end opening 9a when the rotary cutter 10 is in the cutting position.
3b is in an upper position, and the outlet 13b of the storage tank 13 is in a lower position than the end opening 9a when the rotary cutter 10 is in the retracted position. A portable cutting machine with a cutting oil supply device featuring: