JPH10109280A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability at a building site by carrying out cleaning work and driving work at the building site by the same driving machine. SOLUTION: It is furnished with a nozzle 14 to release compressed air of an accumulator, an air passage 15 to communicate the nozzle 14 and the accumulator through to each other, a discharge valve 13 to control release of compressed air from the nozzle 14 and provided separately from a control valve to control motion of a driving machine main body and an operating element 12 to open and close the discharge valve 13, these operating element 12, discharge valve 13, nozzle 14 and air passage 15 are provided in a housing or on a cover 2, and compressed air in the accumulator is released from the nozzle 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving machine having an air duster mechanism capable of freely discharging compressed air.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a pneumatic driving machine, and FIG. 5 shows an example of an air duster. The operation of the pneumatic driving machine will be described.
When the tip 21a of the safety arm 21 is pressed against the material to be driven (not shown) and the trigger lever 5 is further operated, the control valve 4
Is opened, and the compressed air in the main valve upper chamber 8 is discharged to the atmosphere via the air passage 6. For this reason, the main valve 7 rises rapidly and opens, and the compressed air in the accumulator 3 flows into the cylinder 11,
The piston 9 and the driver blade 10 are lowered rapidly, and a stopper (not shown) inserted into the tail cover 20 is driven into the workpiece. When the trigger lever 5 is returned, the control valve 4 closes, the compressed air in the pressure accumulating chamber 3 flows into the main valve upper chamber 8, the main valve 7 descends and closes, and the piston 9 and the driver blade 10 die as shown in the figure. Returning to the point, the compressed air above the piston 9 is simultaneously discharged from the exhaust port to the atmosphere.

Next, the operation of the air duster will be described.
Point the nozzle 14 to the place where the work such as dust removal is performed
Is operated, compressed air supplied from a compressor (not shown) via an air hose (not shown) is rapidly released from the nozzle 14 through the air passage 15 from the discharge valve 13 to remove dust and the like.

Next, as a conventional example of a pneumatic tool having an air duster mechanism, Japanese Utility Model Publication No. 8-8069 will be described with reference to FIG. 6 showing an embodiment thereof. A cylinder member 30 is mounted on a lower surface of the impact wrench main body 23 in which an air motor or the like is built, and a cylindrical nozzle 14 is mounted on the cylinder member 30 so as to be able to expand and contract. That is, the tip of the nozzle 14 protrudes from the cylinder member 30, and the base of the nozzle 14 has a piston portion 14 a that slides on the inner peripheral surface of the cylinder member 30. A spring 33 is interposed between the end wall of the cylinder member 30 and the spring 33 urges most of the nozzle 14 in a direction in which the nozzle 14 is housed in the cylinder member 30. On the other hand, handle part 2 of impact wrench
The compressed air passage 26 provided at 5 is divided into two parts in the middle thereof, one of which is connected to the air motor and the other of which is connected to the cylinder chamber 30 a of the cylinder member 30. An operation knob 31 is provided at the branching section, and an operation knob 3 is provided.
A switching valve 32 is provided for communicating by operating the valve 1 and selectively communicating one of the branched compressed air passages 26 to the compressed air supply side.

[0005]

In the above-mentioned operation of the driving machine, especially in the operation of driving the floor material into the base material in the flooring construction, the floor material is prevented from being lifted up by wood chips or the like scattered on the base material. For this purpose, the base material is cleaned with an air duster, the floor material is set, and a fastener is driven with a driving machine. Usually, since a large number of floor members are continuously attached in one operation, it is necessary to alternately change the driving machine and the air duster each time one sheet is fixed, and there have been problems such as a decrease in work efficiency and easy fatigue.

Since the air duster has a structure in which the compressed air in the air hose flows directly out, the pressure tends to decrease during the dust removal operation, particularly when the inner diameter of the air hose is small or the entire length of the air hose is long. There was a drawback that emission power could not be secured.

In the pneumatic tool having the above-mentioned air duster mechanism, the role of the ball valve 28 for controlling the operation of the main body and the role for controlling the air blow from the nozzle 14 are switched. , And a structure for selecting the driving operation and the air blow. In this case, it is necessary to always operate the trigger lever 27 after confirming which direction the switching of the switching valve 32 is in, and if the operation is troublesome, and if the confirmation is neglected, the air blow is intended and the main body operates. There was a disadvantage. In the case of an air impact wrench, even if the main body operates, no particular problem occurs.However, if this structure is adopted for the driving machine, the main body of the driving machine may operate accidentally, especially in the case of flooring construction, etc. However, there is a problem that the surface of the floor material is scratched, and the construction is redone.

An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, improve the workability of the driving machine, and provide a driving machine having an air duster mechanism with less erroneous operation.

[0009]

The above object is achieved by providing an air duster mechanism in a driving machine. It is also achieved by providing a discharge valve for the air duster independent of the control valve of the driving machine. Further, the present invention is achieved by providing a discharge valve, a nozzle for an air duster, and an air passage communicating these components in one part such as a cover and a housing constituting the driving machine body.

[0010]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. Compressed air supplied from a compressor (not shown) via an air hose (not shown) is accumulated in a pressure accumulating chamber 3 of the housing 1. The compressed air enters the main valve upper chamber 8 via the control valve 4 and the air passage 6, and presses the main valve 7 against the upper surface of the cylinder 11. In this state, the main valve 7 and the upper surface of the cylinder 11 are closed, and the compressed air does not enter the cylinder 11, so that the piston 9 is not driven. The trigger lever 5 cooperates with the operation of the safety arm 21 to open and close the control valve 4 by pulling and returning, and selectively communicates the main valve upper chamber 8 with the pressure accumulating chamber 3 and the atmosphere.

A driver blade 10 is integrally connected to the piston 9. An intermediate hole 11a and a lower hole 11b are formed in the middle and lower part of the cylinder 11, respectively. A check O-ring 18 is provided around the intermediate hole 11a, and between the cylinder 11 and the housing 1, as is well known, A return air chamber 17 for storing compressed air supplied from the intermediate hole 11a when the piston 9 descends is provided. A piston damper 19 is provided below the cylinder 11 to reduce the impact of the piston 9 when it descends.

On the lower side of the housing 1, there are provided an ejection portion composed of a tail cover 20 having a guide hole for the driver blade 10, and a magazine 22 for storing a stopper (not shown).

A cover 2 which is fastened and fixed by bolts or the like to the upper side of the housing 1 and has a part of the main valve upper chamber 8 and the accumulator chamber 3 is provided. The cover 2 holds the operator 12 of the release valve 13 within the movable range of the thumb or the index finger of the held hand while holding the driving machine with one hand, and is independent of the control valve 4 for driving control. A nozzle 14 for discharging compressed air is provided in a concave portion of the cover 2.
The nozzle 14 and the discharge valve 13 communicate with each other through an air passage 15, and the discharge valve 13 also communicates with the accumulator 3.

Next, the driving operation of the driving machine having the air duster mechanism having the above-described structure will be described with reference to FIG. First, the tip 21a of the safety arm 21 is attached to a material to be driven (not shown).
To push up the safety arm 21. In this state, when the trigger lever 5 is pulled, the compressed air in the main valve upper chamber 8 is released to the atmosphere through the air passage 6 and the control valve 4, and the main valve 7 rises, and the compressed air suddenly falls in the cylinder 11. Piston 9
The driver blade 1 which flows upward and is integrated with the piston 9
0 drops sharply. The driver blade 10 strikes a stop (not shown) in the tail cover 20 while descending to the bottom dead center.

When the trigger lever 5 is returned, the compressed air in the pressure accumulating chamber 3 flows into the main valve upper chamber 8 via the air passage 6, and the main valve 7
Close. At the same time, the exhaust port is opened to release the compressed air above the piston 9 in the cylinder 11 to the atmosphere, returning the piston 9 to the top dead center. One driving stroke is completed by the above flow.

Next, the dust removing operation of the driving machine having the above-described air duster mechanism will be described with reference to FIG. First, when the nozzle 14 is directed to a place where dust removal or the like is performed, and the operator 12 of the discharge valve 13 is pressed with the hand holding the driving machine main body, the pressure accumulating chamber 3
Compressed air stored in the nozzle 1 through the air passage 15
4 Dust is rapidly released from the opening at the tip,
Remove wood chips.

[0017]

According to the present invention, since an air duster mechanism is provided on the driving machine main body, when it is necessary to alternately perform a driving operation and a cleaning operation such as flooring, the driving machine and the air duster are switched. The driving operation and the cleaning operation can be appropriately performed without holding the main body without performing any special operation. Since the air duster mechanism guides the compressed air from the pressure accumulating chamber having a large volume, the air pressure is less likely to decrease due to the use of the air duster than the existing air duster having no pressure accumulating chamber, and a stable discharge output can be obtained.

Since the control valve for controlling the driving operation of the driving mechanism and the operating valve of the discharge valve for controlling the air duster mechanism are independent of each other, the risk of erroneous operation is reduced. Further, in the present invention, since the air duster mechanism is provided in one part such as a cover and a housing, the air duster mechanism can be easily and inexpensively attached to a conventional driving machine without replacing main parts. Accordingly, functions can be easily and inexpensively added even with a driving machine already sold.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing a state where dusting work is performed by the driving machine of the present invention.

FIG. 4 is a sectional view showing an example of a conventional driving machine.

FIG. 5 is a sectional view showing an example of a conventional air duster.

FIG. 6 is a sectional view showing a conventional air impact wrench having an air duster function.

[Explanation of symbols]

1 is a housing, 2 is a cover, 3 is a pressure accumulation chamber, 4 is a control valve, 12 is an operator, 13 is a release valve, 14 is a nozzle, 15
Is an air passage.

Claims (3)

[Claims] 1. A pressure accumulating chamber for storing compressed air, a piston reciprocally provided in a cylindrical cylinder, and an operation of injecting and discharging compressed air in the pressure accumulating chamber above the piston in the cylinder. A driving valve for driving a stop into a material to be driven by operating a piston in conjunction with operation of the control valve, the nozzle having an opening for discharging compressed air in the accumulator. And an air passage communicating between the nozzle and the pressure accumulating chamber, and a discharge valve for controlling discharge of compressed air from the nozzle. 2. The operator of the discharge valve is provided within the movable range of the thumb or the index finger of the held hand while the driving machine body is held by one hand, and the discharge valve is independent of the control valve. The driving machine according to claim 1, wherein the driving machine is provided. 3. The driving machine according to claim 1, wherein the discharge valve, the nozzle, and the air passage are provided on a part of a cover or a housing constituting the driving machine main body.