JPH065093Y2 - Stopper holding device for multiple impact driving machine - Google Patents

Description

[Detailed Description of the Invention] [Field of Use of the Invention] The present invention relates to a fastener holding device for a multiple-stroke impacting tool that retains a fastener within the launching portion of the impacting tool.

[Background of the invention]

As shown in FIG. 3, such a conventional driving machine has, as shown in FIG. 3, preliminarily loaded the stopper 2 with the one hand 3 inside the driving section 6 located below the driving machine body 1 and then the other hand 4. Alternatively, the driving machine main body 1 is pressed against the driven material 5 with both hands, and the stopper 2 is driven into the driven material 5 by a driver inside the main body (not shown).

However, since it is necessary to hold the shaft 2b of the stopper 2 with one hand 3 when positioning the stopper 2 on the material 5 to be driven, there is a drawback that the operability is poor and the hammering vibration at the time of driving is caused. There was a serious defect in safety such as numbness in the hand held at.

For this reason, as shown in FIG.
A structure has been proposed in which a permanent magnet 13 is provided inside and the shaft portion 2b of the stopper 2 is attracted and held. 5 and 6 are cross-sectional views taken along line II-II of the guide 7 shown in FIG. 4 near the permanent magnet 13.

FIG. 5 shows a structure in which the permanent magnet 13 is exposed on the inner wall of the guide 7, and the shaft 2b of the stopper 2 is directly attracted and held. This structure has an advantage that the magnetic flux of the permanent magnet 13 is directly transmitted to the stopper shaft portion 2b, the magnetic leakage is small, and the attraction force is increased.
Collide in the guide 7 and hit the surface of the permanent magnet 13,
There is a drawback that part of the permanent magnet 13 is damaged and the attraction force is reduced. Further, if the damage progresses, the permanent magnet 13 comes out of the guide 7, and the stopper 2 cannot be held.

FIG. 6 shows a structure in which the permanent magnet 13 is not exposed from the inner wall of the guide 7. The thin wall portion 17 increases the strength and durability of the inner wall of the guide 7, but since the guide 7 is a magnetic body, the permanent magnet 1
The magnetic flux of No. 3 leaks from the thin portion 17 as shown by the arrow 18, and the attracting force decreases, so that the stopper 2 cannot be held.

[Purpose of device]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to strengthen the holding force of the stopper, and to make the inside of the guide tough and to increase the durability.

[Outline of device]

In the present invention, if the guide in which the permanent magnet is embedded is made of high-manganese steel, which is a non-magnetic material, magnetic flux leakage is reduced and high strength is obtained, and the guide is made of high-manganese steel. , The stopper can be strongly attracted and held, and the durability of the guide can be improved.

[Example of device]

FIG. 1 is an enlarged view of an embodiment of a driving section of the driving machine according to the present invention.

In FIG. 1, the driving machine has a driver 8 integrated with a piston 9 inside a main body 1, and an upper portion of the main body 1 (not shown) is the same as that of the conventional example described above.

The embossing section 6 is an inserter 1 mounted on the lower end of the main body 1.
1. A cylindrical guide 7 which is held by the inserter 11 so as to be movable up and down and has a through hole for guiding the vertical movement of the driver 8, and is provided between the upper end of the guide 7 and the main body 1. It is composed of a spring 12 that presses in the launch direction. In the vicinity of the lower end of the guide 7, the permanent magnet 1 is provided so that its inner side surface is not exposed from the inner wall surface of the guide 7.
3 is buried. The permanent magnet 13 is set to a length shorter than the length of the stopper 2 used to hold the stopper 2 vertically. A recess 15 for holding the stopper head 2a in a non-contact manner is provided on the inner wall of the guide 7 above the permanent magnet 13, and a taper portion 14 is provided between the recess 15 and the permanent magnet 13. The permanent magnet 13 is embedded in the inner wall of the guide 7 by means such as adhesion.

The guide 7 is made of high-manganese steel, which has little magnetic flux leakage and high strength. What is high manganese steel?
At least 5-30% of manganese and 0.
It is a steel material containing 1 to 20% and carbon of 0.05 to 1%. Since high manganese steel can obtain a Rockwell hardness of about 20 to 50 while being non-magnetic by work hardening, the head 2a of the fastener 2 is hit and slid to guide the guide 7. The surface hardening is 5 with Rockwell hardness
It will rise to about 0.

When the stopper 2 is sucked and held, as shown in FIG. 1, when the stopper head 2a is preliminarily loaded into the guide 7 of the embossing section 6,
The stopper shaft 2b is attracted to the stopper 2 by the permanent magnet 13 below the recess 15, and is held perpendicularly in the same direction as the driving direction. As shown in FIG. 2, in the vicinity of the permanent magnet 13, there is a thin wall portion 17 having a wall thickness capable of withstanding an impact at the time of driving between the inner wall of the guide 7 and the permanent magnet 13. Since the guide 7 is made of a non-magnetic material, the magnetic flux 18 of 13 has little leakage, and is directly transmitted to the stopper shaft portion 2b so that the stopper 2 can be strongly attracted and held.

When starting to drive the stopper 2, the tip of the stopper 2 is to be driven 5
When pressed against, the stopper head 2a pushes the driver 8, so that the piston 9, the cylinder 10 and the sleeve 16 operate to start the driving process. Then, the driving operation is repeated many times until the stopper 2 is completely driven. At this time, the stopper head 2a is guided by the guide 7 and moves while striking and sliding on the inner wall of the guide 7, but the guide 7 is made of high manganese steel as described above and has a Rockwell hardness of about 20 to 50. It does not wear due to deformation due to its hardness. In addition, since the stopper head 2a strikes and slides on the inner wall of the guide 7, the surface hardness of the guide 7 is further hardened by work hardening, so that the guide 7 is less likely to be worn and deformed.

[Effect of device]

As described above, according to the present invention, since the guide in which the permanent magnet of the driving section of the driving machine is embedded is a non-magnetic material and is made of high manganese steel having work hardening characteristics, the magnetic flux of the permanent magnet is reduced. It can be effectively used to strongly adsorb and hold the stopper and improve operability. High manganese steel has a Rockwell hardness of 2 due to work hardening and non-magnetism.
Since a hardness of 0 to 50 can be obtained, when the fastener is driven, the guide can be prevented from being worn and deformed even if the fastener moves while sliding while hitting the guide, and the guide made of high manganese steel can be nailed. Since it has the property of being work-hardened by hitting and sliding by the head, the surface of the guide is further hardened, and the effect of further preventing wear deformation of the guide can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an essential part showing an embodiment of a fastener holding device for a driving tool according to the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIG. 3 is a conventional driving machine. 4 is a perspective view showing an example of use of the driving machine, FIG. 4 is a vertical sectional side view of a main part of the driving machine of FIG. 3, and FIG. 5 is II- of FIG.
FIG. 6 is a sectional view taken along line II, and FIG. 6 is another example of a conventional driving machine.
FIG. 2 is a sectional view corresponding to line II-II in the figure. In the figure, 2 is a stopper, 6 is a launching part, 7 is a guide, 8
Is a driver, 9 is a piston, 10 is a cylinder, 13 is a permanent magnet, 14 is a tapered portion, 15 is a concave portion, and 18 is a magnetic flux.

Claims (1)

[Scope of utility model registration request] 1. A driving machine main body which houses a driving unit composed of a piston integrally formed with a driver striking a stopper and a cylinder slidably storing and holding the piston, and a lower end of the driving machine main body. Mounted on the inserter, a cylindrical guide having a through hole that is held by the inserter so as to be movable up and down, and has a through hole for guiding the vertical movement of the driver, and the inner surface of the guide is exposed near the lower end of the guide to the inner surface of the guide. And a permanent magnet having a length shorter than the length of the fastener used, and a recess for holding the fastener head in a non-contact manner on the guide inner wall above the permanent magnet. In a multi-striking driving machine in which a taper portion is provided between the recess and the permanent magnet, the driver is reciprocated a large number of times to strike a stopper by striking a plurality of times, and the guide is 5-30% manganese. Chromium 0.1 ~
A fastener holding device for a multiple impact driving machine, which is made of a non-magnetic high manganese steel containing 20% and 0.05 to 1% of carbon and having work hardenability.