JPH03117571A - Nailing machine - Google Patents

Abstract

PURPOSE:To substantially reduce flow resistance and provide a high impact force without reducing gas pressure by providing an oil reservoir for temporarily receiving oil from a piston retreating oil supply chamber in the advance of the piston near a gas accumulating chamber. CONSTITUTION:A nailing piston 18 is advanced with a predetermined stroke by gas pressure in a gas accumulating chamber 16 to hit a nail 20 with a piston rod 18a and drive the nail 20 into concrete or the like. As the nailing piston 18 is advanced, oil in an oil supply chamber 15 is supplied from a front oil path 31a to an oil reservoir 17 through a front valve 29a of a safety valve 29, a front valve 30a of a trigger valve 30 and a rear oil path 31b, and a piston 25 for oil reservoir is advanced to send the oil temporarily to the oil reservoir 17. After the completion of the nailing, a safety sleeve 29d is pressed against a nailed material, while a finger is separated from a trigger 30d. Then a trigger valve 30 is moved forward to cause a rear valve 30b to coincide with respective paths 32a, 33a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a nailing machine that is small and lightweight and capable of obtaining high striking force.

(Prior Art) A conventional nailing machine is provided with an air pressure supply chamber for advancing the piston on the rear side of the nailing piston, and the piston is advanced by supplying high pressure air to the supply chamber, and the piston is moved forward by the piston rod. The nail is driven into concrete, etc. by hitting it.

(Problem to be solved by the invention) However, since the air pressure is usually as low as 5 kg/am, the pressure receiving surface of the piston must be made large in order to obtain a high impact force. The punching machine becomes larger and heavier.

Furthermore, since the nailing machine is large, nailing work cannot be performed in narrow spaces.

The present invention was made to solve the above problems;
The purpose of the present invention is to provide a new nailing machine that is small, lightweight, and capable of obtaining high striking force by rationally utilizing hydraulic pressure and high-pressure gas.

(Means for Solving the Problems) Therefore, in the present invention, an oil supply chamber for retracting the piston is provided on the front side of the nailing piston, a gas pressure accumulation chamber for advancing the piston is provided on the rear side of the piston, The present invention is characterized in that an oil reservoir chamber is provided adjacent to the gas pressure accumulation chamber, into which oil from the piston retreat oil supply chamber is temporarily filled when the piston moves forward.

(Function) Then, by supplying oil to the supply chamber and retracting the piston, the gas pressure in the pressure accumulation chamber is increased.

Then, when the piston advances due to gas pressure, the nail is struck and the oil in the supply chamber is temporarily introduced into the oil reservoir chamber.

(Effects of the Invention) The present invention uses hydraulic pressure to move the piston backward to increase the gas pressure, so both the hydraulic pressure and the gas pressure can be set at high pressures, and the pressure-receiving surface of the piston can be made small, so the nailer can be made smaller. It is lighter in weight and easier to nail in tight spaces.

Moreover, since the gas pressure is high, a high impact force can be obtained.

Furthermore, when the piston advances due to gas pressure, the oil in the supply chamber is temporarily put into the adjacent oil reservoir chamber, so when the oil in the supply chamber is returned to the tank via 10=15n+ piping, the flow path The resistance reduces the gas pressure and reduces the impact force, but if the gas is temporarily placed in a nearby oil sump chamber as in this proposal, the flow path resistance will be greatly reduced and the gas pressure will not be reduced and the striking force will be reduced. You will gain striking power.

Note that after the nail driving operation, the gas pressure in the gas accumulator can be used to return the oil in the oil reservoir to the tank.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the nailing machine IO includes a hollow horizontally elongated body 11, and a grip 12 is integrally provided in the longitudinally intermediate portion of the body 11. As shown in FIG.

The front and rear ends of the body 11 are oil-tightly closed by a front plug 13 and a rear plug 14, respectively.

The body 11 is provided with an oil supply chamber 15, a gas pressure accumulation chamber 16, and an oil reservoir chamber 17 in series from the front to the rear.

The oil supply chamber 15 projects into the gas pressure accumulation chamber I6, and a nailing piston 18 is fitted into the oil supply chamber 15 in an oil-tight and airtight manner so as to be slidable back and forth. 15 and a gas pressure accumulation chamber 16 are separated.

A guide cylinder I9 is fixed to the front part of the front plug I3,
The front plug 13 has a guide hole 13a coaxial with the guide hole 19a of the guide cylinder 19, and the piston rod 18a of the piston 18 is fitted into the guide holes 13a, 19a in an oil-tight and air-tight manner so as to be slidable back and forth. has been done.

When the piston 18 moves forward with a predetermined stroke, the piston rod 18a hits the nail 20 set at the front end of the guide hole 19a, driving the nail 20 into concrete or the like.

High pressure nitrogen gas is sealed in the gas accumulator chamber I6.

Note that 21 is a bolt that closes the gas inlet 11a of the body 11.

An oil reservoir piston 25 is fitted into the oil reservoir chamber 17 so as to be slidable back and forth in an oil-tight and airtight manner, and the oil reservoir chamber 17 and an atmospheric chamber 26 are partitioned by the piston 25. A sealing member 27 is attached to the partition wall 11b between the atmospheric chamber 26 and the gas accumulating chamber 16, and the piston rod 25a of the piston 25 is slidable back and forth in a guide hole 27a of the sealing member 27 in an oil-tight and airtight manner. is mated to.

When the piston 25 and the nailing piston 18 are in the retracted position, the piston rod 25a of the piston 25 is connected to the gas pressure accumulating chamber I6 with a slight gap from the nailing piston 18.
It is set to protrude inwards.

On the other hand, the grip 12 is formed with an oil supply chamber 32a that communicates with the oil supply pump 32, and an oil return passage 33a that communicates with the oil return tank 33. A front oil passage 31a that communicates with the chamber 15 and a rear oil passage 31b that communicates the oil return passage 33a and the oil reservoir chamber 17 are formed.

Oil supply passage 32a and oil return passage 33 of the grip 12
A safety valve 29 and a trigger valve 30 are interposed with respect to a, and the supply and discharge of oil is controlled by switching the respective valves 29 and 30.

Specifically, as shown in FIG. 2, the trigger valve 30 is
It is urged in the forward movement direction by a spring 30c, and the consequent 30b is normally aligned with the oil supply passage 32a and the oil return passage 33a, respectively.

Then, pull the trigger 30d with your finger (and move back, and the antecedent 3
0a is switched to match each passage 32a, 33a, respectively.

The safety valve 29 is biased in the forward movement direction by a spring 29c, and the successor 29b is normally aligned with the oil supply passage 32a and the oil return passage 33a, respectively.

When the safety sleeve 29d fitted to the face end of the guide tube 19 is pressed against the material to be nailed (concrete, etc.), it moves backward via the rod 29e, and the antecedent 29a matches each passage 32a, 33a. It can be switched to

With the above configuration, it is assumed that the nailing piston 18 is now in the forward position shown by the two-dot chain line, and the oil sump piston 25 of the oil sump chamber 17 is in the backward position.

Then, set the nail 20 in the guide hole 9a of the guide tube 19, and hold the grip 12 to remove the safety sleeve 29d.
When the safety valve 29 moves backward via the rod 29e, and the antecedent 29a matches each passage 32a, 33a, the pump 3
2 oil flows from the oil supply passage 32a to the trigger valve 30.
0b, passing through the antecedent 29a of the safety valve 29, and the front oil passage 3
The oil is supplied from 1a to the oil supply chamber 15 and the nailing piston 18
is retracted to the retracted position shown by the solid line, and the gas pressure in the gas accumulator chamber 16 is increased by the retraction of the piston.

Then, when you pull the trigger 30d with your finger, the trigger valve 30
moves backward so that the antecedent 30a matches each of the passages 32a and 33a, the oil supply passage 32a and the oil return passage 33a are cut off, and the front oil passage 31a and the rear oil passage 31b are communicated with each other.

As a result, the nailing piston 18 moves forward with a predetermined stroke due to the gas pressure in the gas pressure accumulation chamber 16, and the piston rod 1
The nail 20 is struck with 8a to drive the nail 20 into concrete or the like.

As the nailing piston 18 moves forward, the oil in the oil supply chamber 15 flows from the front oil passage 31a through the antecedent 29a of the safety valve 29, the antecedent 30a1 of the trigger valve 30, and the rear oil passage 31b to the oil reservoir chamber 17. The oil sump piston 25 moves forward and oil is temporarily put into the oil sump chamber 17.

After nail driving is completed, if you release your finger from the trigger 30d while pressing the safety sleeve 29d against the nail material,
The trigger valve 30 moves forward and the consequent 30b opens each passage 32a,
33a.

As a result, the pump 32-trigger valve 30 consequent 30b
→Oil well 29a of safety valve 29 - "@Oil passage 31a → Oil supply chamber 15 are communicated, the nailing piston 18 is moved back by hydraulic pressure, the gas pressure in the gas accumulator chamber 16 is increased, and the oil sump is caused by gas pressure. The piston 25 is moved back, and the oil sump chamber 17→rear oil passage 3], b→multiple valve 30b of the trigger valve 30, antecedent 29a of the safety valve 29, and tank 23 are connected, and the oil sump chamber 17
of oil is returned to tank 33.

Next, when the pressing of the safety sleeve 29d is stopped, the safety valve 29 moves forward and the subsequent part 29b is moved forward to each passage 32a.
, 33a, the oil supply passage 32a is blocked, the oil return passage 33a and the front oil passage 31a and the rear oil passage 31b are communicated, and the nailing piston 18 is advanced by the gas pressure in the gas pressure accumulation chamber I6, and the oil pressure is increased. The oil in the supply chamber 15 is returned to the tank 33.

If you stop pressing the safety sleeve 29d while pulling the trigger 30d with your finger after nailing is finished, the safety valve 29 will move forward and the consequent 29b will become the antecedent 30a of the trigger valve 30. When they match, the oil supply passage 32a and the oil return passage 33a are blocked, and the front oil passage 31a and the rear oil passage 31b are communicated, but both pistons 18 and 25 are stable.

Then, when you release your finger from the trigger 30d, the trigger valve 3
0 moves forward and the consequent 30b matches each passage 32a33a, the oil supply passage 32a is cut off, the ura return passage 33a and the front oil passages 31a and 31b communicate with each other, and the extra ura of the oil supply chamber 15 is connected to the tank. Returned to 33.

In this case, the nailing piston 18 is in a state of being advanced to the forward position a shown by the two-dot chain line.

Then, set the next nail 20 in the guide hole 9a of the guide tube I9, and hold the grip 12 to remove the safety sleeve 20.
9d is pressed against a corrugated nail material (concrete, etc.), the safety valve 29 moves backward via the rod 29e, and the previous case 29
a corresponds to each passage 32a, 33a.

As a result, the oil of the pump 32 is transferred from the oil supply passage 32a to the double valve 30b of the trigger valve 30 and the antecedent 29 of the safety valve 29.
a, the oil is supplied from the front oil passage 31a to the oil supply chamber 15, and the nailing piston 18 is retreated to the retreat position shown by the solid line.

The retraction of the piston 18 increases the gas pressure in the gas accumulator chamber 16.

Moreover, the gas pressure in the gas pressure accumulating chamber 16 is reduced to the piston rod 25a.
The oil sump piston 25 is moved back. As a result, the oil in the oil reservoir chamber 17 is transferred from the rear oil passage 31b to the oil return passage 3.
The oil is returned to the oil return tank 33 through the antecedent 29a of the safety valve 29 of 3a and the double valve 30b of the rigger valve 30.

Then, when the trigger 33d is pulled with a finger, the nail 20 is struck and driven into concrete or the like in the same manner as described above.

According to the above embodiment, the nailing piston 18 is moved back using hydraulic pressure to increase the gas pressure in the gas accumulator chamber 16, so both the hydraulic pressure and the gas pressure can be set at high pressures (for example, the hydraulic pressure is 140 kg/kg/cm).
cm", gas pressure is 100 kg/am"), the pressure receiving surface (piston diameter) of the nailing piston 18 can be made smaller.
The nailer IO can be made smaller and lighter in weight, making it easier to drive nails in narrow spaces.

Also, since the gas pressure was high, a high impact force could be obtained.

Further, the nailing piston 18 is advanced by gas pressure,
The oil in the oil supply chamber 15 is supplied to the short front and rear oil passages 31a and 31b.
Since the oil is temporarily introduced into the oil reservoir chamber 17, the flow resistance is significantly reduced compared to when the oil in the oil supply chamber 15 is returned to the tank 33 via a long pipe (10 to 15 m). Gas pressure is not reduced and high striking power can now be obtained.

Furthermore, after the nail driving work, the gas pressure in the gas accumulator chamber 16 can be used to return the oil in the oil reservoir chamber 17 to the tank 33, eliminating the need to provide a new oil return mechanism.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a nailing machine according to the present invention, and FIG. 2 is a circuit diagram of a safety valve and a trigger valve. IO... Nailer, 11... Body, 15... Oil supply chamber, 16... Gas pressure accumulation chamber, 17... Oil sump chamber,
18... Piston for nailing, 18a... Piston rod, 20... Nail, 25... Piston for oil sump,
29... Safety valve, 30... Trigger valve, 32
...Oil supply pump, 33...Oil return tank.

Claims (1)

[Claims] (1) An oil supply chamber for retracting the piston is provided on the front side of the nailing piston, and a gas pressure accumulation chamber for advancing the piston is provided on the rear side of the piston. A nailing machine characterized in that an oil reservoir chamber is provided to temporarily contain oil from the oil supply chamber for retracting the piston.