JP7047446B2 - Driving tool - Google Patents

Description

The present invention relates to a driving tool for stamping a fastener.

As this type of driving tool, a gas combustion type driving tool for driving a fastener by the combustion pressure of combustible gas and a pneumatic driving tool for driving a fastener by operating a piston with compressed air are known (for example, Patent Document 1 and Patent Document 1 and). 2).

The output of such a driving tool is set according to the purpose, and by increasing the output, it is possible to drive into a hard material. For example, if the fastener is launched by the combustion pressure when the mixture of combustible gas and compressed air is ignited, a large output can be obtained by the energy of the compressed air and the thermal energy of the combustion gas. (See Patent Document 3).

Japanese Unexamined Patent Publication No. 2009-45676 Japanese Unexamined Patent Publication No. 2005-219193 Japanese Unexamined Patent Publication No. 51-58768

However, when the output of the driving tool is increased, the reaction and impact at the time of driving become large, so that the burden on the operator holding the tool also becomes large. In the conventional driving tool, vibration is reduced by rubber wrapped around the grip, but there is a problem that the cushioning performance is not sufficient when the impact is large. In addition, a large impact may be transmitted to the switch provided on the grip or the like, which may cause the switch to malfunction or be damaged.

Further, the conventional high-energy driving tool has a problem that the weight becomes heavy and the operability is poor because the rigidity is increased by integrally forming the body and the grip with metal.

Therefore, it is an object of the present invention to provide a driving tool capable of sufficiently cushioning an impact transmitted to a grip while having a simple structure.

The present invention has been made to solve the above-mentioned problems, and includes an output unit that generates kinetic energy for launching a fastener and a grip for the user to grip the output unit and the above-mentioned. The grip is connected to each other with a movable gap, and is characterized in that an elastic member is disposed in the gap.

The present invention is as described above, and since the output unit and the grip are connected to each other with a movable gap, the output unit and the grip move relatively when the output unit operates. Since the elastic member is arranged in the gap, the elastic member can receive the impact when the output portion and the grip move relatively. Therefore, the impact vibration applied to the grip can be suppressed with a simple structure. By suppressing the impact vibration applied to the grip, it is possible to reduce the burden on the operator and prevent the switch provided on the grip from malfunctioning or being damaged.

Further, since the impact vibration applied to the grip can be suppressed, the grip can be constructed of a lightweight material such as plastic. Therefore, the driving tool can be made lighter and easier to handle.

It is a side view of a driving tool. It is a side sectional view of a driving tool (a sectional view cut along a plane specified by the axis of the output unit and the axis of the grip). It is a perspective exploded view of a driving tool. It is a perspective view which shows the internal structure of a driving tool. It is a partial cutaway perspective sectional view near the first connection part. FIG. 1 is a cross-sectional view taken along the line AA (see FIG. 1). (A) A partial cross-sectional view taken along line BB (see FIG. 6), and (b) an enlarged view of part X. (A) A partial cross-sectional view taken along line CC (see FIG. 6), and (b) an enlarged view of part Y. (A) A partial cross-sectional view taken along the line DD (see FIG. 6), and (b) an enlarged view of the Z portion. It is an enlarged view of part E (see FIG. 1). It is an enlarged view of part E (see FIG. 1), and is a view when (a) the body housing is moved up and (b) is a view when the body housing is moved down. It is an enlarged view of part E (see FIG. 1), and is a view when (a) the body housing is moved backward and (b) is a view when the body housing is moved forward. It is a side sectional view (partially omitted body housing etc.) of the driving tool which concerns on a modification. It is an enlarged view of the F part (see FIG. 13).

The driving tool 10 according to the present embodiment is a gas combustion type driving tool 10 configured to launch a fastener by the combustion pressure when ignited with respect to a mixture of flammable gas and compressed air. The driving tool 10 is not limited to the gas combustion type driving tool 10 using compressed air, and the fastener may be driven by another method. For example, it may be a normal gas combustion type driving tool that does not use compressed air, or it may be a pneumatic type driving tool that launches a fastener with compressed air.

As shown in FIGS. 1 and 2, the driving tool 10 includes an output unit 11, a body housing 18, a nose unit 19, a grip 20, a gas can storage unit 27, a magazine 28, a coupler 40, and the like. To prepare for.

The output unit 11 generates kinetic energy for launching the fastener, and has a built-in combustion chamber 12 as shown in FIG. The combustion chamber 12 is a space for burning combustible gas. The combustion pressure generated in the combustion chamber 12 acts on the piston 16 and is used to launch the fastener.

As shown in FIG. 2, the output unit 11 includes an ignition device 13, a cylinder head 14, a cylinder 15, a piston 16, a driver 17, and the like.

The ignition device 13 is for generating sparks in the combustion chamber 12, and for example, the voltage of the battery pack 50, which will be described later, is boosted to a high voltage and the high voltage is discharged to generate sparks. It is a spark plug. The ignition device 13 executes an ignition operation at a predetermined timing based on a signal from the control device 25 described later. When the ignition device 13 operates and ignites the mixed gas in the combustion chamber 12, high-pressure combustion gas is generated in the combustion chamber 12, and the combustion pressure is configured to shockably slide the piston 16 described later. ing.

The cylinder head 14 is a member that forms a combustion chamber 12 together with a cylinder 15 described later. The cylinder head 14 is fixed so as to close the opening of the cylindrical cylinder 15. The cylinder head 14 is provided with a supply path for introducing compressed air and combustible gas into the combustion chamber 12.

The cylinder 15 is a tubular member arranged along the axial direction D1 of the output unit 11. The inside of the cylinder 15 forms a space for slidably guiding the piston 16 described later and a space for forming the combustion chamber 12. The cylinder 15 is made of metal so as to withstand the impact of the output unit 11.

The piston 16 is a member slidably housed inside the cylinder 15. When high-pressure combustion gas is generated in the combustion chamber 12, this combustion gas acts on the piston 16 to operate the piston 16 in the driving direction.

The driver 17 is a member for striking the fastener and is coupled to the front of the piston 16. When the driving operation is executed, the driver 17 slides along the ejection path of the fastener and acts to eject the fastener in the ejection path from the ejection port 19a.

The body housing 18 is a cover member that covers the output unit 11 described above. The body housing 18 according to the present embodiment is made of a synthetic resin such as plastic.

The nose portion 19 is for driving and guiding the fastener toward the material to be driven, and is slidably attached to the tip of the output portion 11. An injection port 19a for punching out a fastener is formed at the tip of the nose portion 19. When the trigger operation unit 23, which will be described later, is operated to perform the driving operation, the fastener is driven from the injection port 19a to the material to be driven.

The nose section 19 is configured to be able to be pushed into the output section 11, and the driving operation is not performed even if the trigger operating section 23 is operated unless the pushing operation is performed. Specifically, the safety switch (not shown) is turned on by pushing the nose portion 19, and the signal of the trigger switch 24 described later is not valid unless this safety switch is turned on. It is configured in. Therefore, the fastener is not launched unless the nose portion 19 is pressed against the material to be driven, so that safety is ensured.

The grip 20 is a portion for the user of the driving tool 10 to grip, and is connected to the output unit 11 in a substantially T shape. That is, as shown in FIG. 1, the axial direction D2 of the grip 20 is substantially orthogonal to the axial direction D1 of the output unit 11. The grip 20 according to the present embodiment is made of a synthetic resin such as plastic and is lightweight.

The grip 20 is provided with a trigger operation unit 23 that can be pulled. The trigger operation unit 23 is arranged at a position where the index finger rests when the grip 20 is gripped. When the trigger operation unit 23 is operated, the trigger switch 24 arranged inside the grip 20 is pressed and turned on. The signal output from the turned-on trigger switch 24 is transmitted to the control device 25 arranged inside the grip 20 and processed. Specifically, the control device 25 executes a predetermined driving operation if both the safety switch and the trigger switch 24 described above are in the ON state.

Further, a battery mounting portion 26 to which the battery pack 50 can be attached and detached is provided on the lower end surface of the grip 20. Since the driving tool 10 according to the present embodiment is driven by the electric power supplied from the battery pack 50 having a built-in secondary battery, the driving tool 10 is used in a state where the battery pack 50 is mounted on the battery mounting portion 26. In the present embodiment, the battery pack 50 is configured to be slid from the rear and mounted on the battery mounting portion 26. Further, the battery pack 50 is configured to be slid rearward and can be removed from the battery mounting portion 26.

The gas can storage unit 27 is a portion for mounting a gas can, which is a source of combustible gas supplied to the combustion chamber 12. As shown in FIG. 2, the gas can storage portion 27 according to the present embodiment is formed in a cylindrical shape.

The magazine 28 is for loading a plurality of stampable fasteners, and is connected to the nose portion 19. The fasteners loaded in the magazine 28 are sequentially supplied to the nose portion 19, and the leading fastener supplied to the nose portion 19 is configured to be launched by the driver 17. The magazine 28 according to the present embodiment can accommodate the connecting fasteners aligned in a straight line.

The coupler 40 is for connecting a hose plug or the like connected to an air supply source such as an air compressor and taking in compressed air from the outside. The driving tool 10 according to the present embodiment sends compressed air supplied from the outside via the coupler 40 to the combustion chamber 12 and is used for driving the fastener.

The driving tool 10 configured in this way executes the driving operation as follows. That is, when the trigger operation unit 23 is operated and the driving operation is started, a predetermined amount of combustible gas and compressed air are supplied into the combustion chamber 12. Then, when the combustible gas and the compressed air are introduced into the combustion chamber 12 to generate an air-fuel mixture, the control device 25 operates the ignition device 13 and ignites the air-fuel mixture. As a result, the pressure in the combustion chamber 12 rapidly increases. When the pressure in the combustion chamber 12 increases, the piston 16 slides due to the combustion pressure, and the fastener 17 is launched by the driver 17 that slides integrally with the piston 16.

By the way, the output unit 11 and the grip 20 according to the present embodiment are configured to be separable from each other, and are connected by providing a gap G1 (see FIG. 8B) so as to be movable with each other. An elastic member 34 is arranged in this gap G1.

Specifically, as shown in FIG. 3, the output unit 11 and the grip 20 are connected at the connection unit by using a connection component composed of a shaft member 32, a collar 33, an elastic member 34, a nut 35, and the like. Has been done. It is desirable that a plurality of these connecting portions are provided along the axial direction D1 of the output unit 11. The driving tool 10 according to the present embodiment includes two connection portions, a first connection portion 30 and a second connection portion 31.

The shaft member 32 is a metal bolt and meshes with the nut 35. Further, the collar 33 is a metal tubular member that is externally attached to the shaft member 32. The collar 33 is formed to have substantially the same length as the shaft portion of the shaft member 32, and is formed so that the shaft member 32 can be inserted.

The elastic member 34 is a tubular member that is exteriorized by the collar 33. The elastic member 34 has a certain elasticity and is made of a material having an elastic limit larger than that of metal at least. The elastic member 34 according to the present embodiment is made of rubber, but the present invention is not limited to this, and the elastic member 34 may be made of synthetic resin. The elastic member 34 is formed to be shorter than the shaft member 32 and the collar 33, and is attached so as to cover the outer periphery of the intermediate portion of the collar 33.

Further, a connection portion with the grip 20 is integrally formed in the cylinder 15, and a connection member such as the shaft member 32 described above is inserted into this connection portion. By forming the connection portion in the cylinder 15 in this way, the connection portion can be provided in the cylinder 15 that originally requires strength as an internal combustion engine, so that the strength of the connection portion is improved without increasing the number of parts. Can be made to. In the present embodiment, the cylinder 15 includes a first protruding cylinder portion 15a constituting the first connecting portion 30 and a second protruding cylinder portion 15b constituting the second connecting portion 31.

The first protruding cylinder portion 15a and the second protruding cylinder portion 15b are formed so as to project from the outer peripheral portion of the cylinder 15 in the direction of the grip 20, and are provided with a through hole for inserting a connecting member. This through hole penetrates in a direction perpendicular to the plane specified by the axis of the output unit 11 and the axis of the grip 20. As shown in FIG. 8, the through hole is formed to have a diameter larger than the diameter of the shaft member 32 to which the collar 33 is mounted, and a gap G1 is formed between the through hole and the shaft member 32 to which the collar 33 is mounted. are doing. The gap G1 is filled with the elastic member 34.

Further, as shown in FIG. 4, the grip 20 is formed by joining the left and right divided pieces (first divided piece 21 and second divided piece 22). The first divided piece 21 and the second divided piece 22 are formed with front support portions 21a and 22a constituting the first connection portion 30, and rear support portions 21b constituting the second connection portion 31, respectively. There is. The front support portions 21a and 22a and the rear support portion 21b are formed so as to project from the tip of the grip 20, and a through hole for inserting a connecting member is formed.

The front support portion 21a formed on the first divided piece 21 and the front support portion 22a formed on the second divided piece 22 are arranged so as to face each other as shown in FIGS. 5 and 6. , The first protruding cylinder portion 15a is sandwiched from both sides. At this time, the through holes of the pair of front support portions 21a and 22a are arranged coaxially with the through holes of the first protruding cylinder portion 15a. As shown in FIGS. 7 and 9, the through holes of the front support portions 21a and 22a are formed to have substantially the same diameter as the shaft member 32 to which the collar 33 is mounted, and are formed around the shaft member 32 to which the collar 33 is mounted. The shaft member 32 is supported so that there is no gap.

Further, the rear support portion 21b formed on the first divided piece 21 and the rear support portion (not shown) formed on the second divided piece 22 also face each other as in the front support portions 21a and 22a. The second protruding cylinder portion 15b is sandwiched from both sides. At this time, the through holes of the pair of rear support portions 21b are arranged coaxially with the through holes of the second protruding cylinder portion 15b. Similar to the through holes of the front support portions 21a and 22a, the through hole of the rear support portion 21b is also formed to have substantially the same diameter as the shaft member 32 to which the collar 33 is mounted, and is formed around the shaft member 32 to which the collar 33 is mounted. The shaft member 32 is supported so that there is no gap in the shaft member 32.

As described above, in the present embodiment, the output unit 11 and the grip 20 are connected by a shaft member 32 that individually penetrates the output unit 11, and the elastic member 34 is arranged around the shaft member 32. Therefore, when viewed in the axial direction of the shaft member 32, the first protruding cylinder portion 15a of the output portion 11 and the front support portions 21a and 22a of the grip 20 are arranged so as to overlap each other. Further, the second protruding cylinder portion 15b of the output portion 11 and the rear support portion 21b of the grip 20 are arranged so as to overlap each other. By overlapping the connection portion of the output unit 11 and the connection portion of the grip 20 in this way, the output unit 11 and the grip 20 can be brought as close as possible to each other. Rotation can be suppressed and the burden on the operator can be reduced.

The through holes of the first protruding cylinder portion 15a and the second protruding cylinder portion 15b support the shaft member 32 via the elastic member 34. Therefore, the shaft member 32 is movable in the radial direction within the range in which the elastic member 34 can be elastically deformed. Therefore, the output unit 11 and the grip 20 can move relative to each other in all directions of 360 degrees in the plane (cross section in FIG. 2) specified by the axis of the output unit 11 and the axis of the grip 20. .. Therefore, even if impact vibration occurs in the output unit 11, the impact is mitigated by the relative movement between the output unit 11 and the grip 20, and the elastic member 34 receives the impact to momentarily absorb the impact. can do.

In this embodiment, the output unit 11 and the grip 20 can move relative to each other in all directions, but the present invention is not limited to this. In order to absorb the recoil when the output unit 11 is driven, the relative movement may be possible only in the axial direction D1 of the output unit 11. However, due to the relationship between the reaction at the time of driving and the center of gravity of the machine, a reaction that the machine tries to rotate at the time of driving occurs. It is desirable that the machine can move relative to at least two directions, D3, which are orthogonal to each other.

Here, in the present embodiment, since the body housing 18 is fixed to the output unit 11, when the output unit 11 and the grip 20 move relative to each other, the relative movement also occurs between the body housing 18 and the grip 20. Occur. In the present embodiment, as shown in FIG. 10, the axial direction D1 of the output unit 11 and the direction D3 orthogonal to the axial direction D1 are taken so that the housing is not damaged when such relative movement occurs. A gap G2 is provided between the body housing 18 and the grip 20 in the two directions of and.

Therefore, when the output unit 11 and the grip 20 move relative to the axial direction D1 of the output unit 11, as shown in FIG. 11, the gap G2 in the axial direction D1 of the output unit 11 expands or contracts. , The housing is prevented from colliding and being damaged.

Further, when the output unit 11 and the grip 20 move relative to the direction D3 orthogonal to the axial direction D1 of the output unit 11, as shown in FIG. 12, the output unit 11 with respect to the axial direction D1. By expanding or contracting the gap G2 in the orthogonal direction D3, the housing is prevented from colliding and being damaged.

As described above, according to the present embodiment, since the output unit 11 and the grip 20 are connected by providing a gap G1 so as to be movable with each other, the output unit 11 and the grip 20 are connected to each other when the output unit 11 is operated. Moves relatively. Since the elastic member 34 is arranged in the gap G1, the elastic member 34 can receive the impact when the output unit 11 and the grip 20 move relatively. Therefore, the impact vibration applied to the grip 20 can be suppressed with a simple structure. By suppressing the impact vibration applied to the grip 20, the burden on the operator can be reduced, and the switch provided on the grip 20 can be prevented from malfunctioning or being damaged.

Further, since the impact vibration applied to the grip 20 can be suppressed, the grip 20 can be made of a lightweight material such as plastic. Therefore, the driving tool 10 can be made lighter and easier to handle.

In the above-described embodiment, the elastic member 34 is arranged around the shaft member 32, but the present invention is not limited to this. For example, as shown in FIGS. 13 and 14, a new connecting portion 36 may be provided, and the elastic member 39 may be arranged therein. In this modification, as shown in FIG. 14, the connecting portion 36 is formed by the flange 37 protruding from the outer periphery of the cylinder 15 and the receiving groove 38 provided at the tip of the grip 20. The flange 37 is inserted into the receiving groove 38, but is not inserted all the way to the back, and can move in the back direction or the front direction (direction D3 orthogonal to the axial direction of the output unit 11). .. Further, the inner wall surfaces on both sides of the receiving groove 38 are planes perpendicular to the axial direction D1 of the output unit 11 and face the flange 37. The inner wall surfaces on both sides of the receiving groove 38 are arranged at a distance larger than the thickness of the flange 37, and the flange 37 can be moved in the axial direction D1 of the output unit 11. An elastic member 39 is attached to the inner wall surfaces on both sides of the receiving groove 38.

In such a configuration, when the output unit 11 and the grip 20 move relative to each other in the axial direction D1 of the output unit 11, the flange 37 is pressed against the elastic member 39 to be buffered. Further, when the output unit 11 and the grip 20 move relative to each other in the direction D3 orthogonal to the axial direction D1 of the output unit 11, the flange 37 moves in the receiving groove 38 and interferes with each other. There is no such thing.

Even with such a configuration, the impact vibration applied to the grip 20 can be suppressed with a simple structure. By suppressing the impact vibration applied to the grip 20, the burden on the operator can be reduced, and the switch provided on the grip 20 can be prevented from malfunctioning or being damaged.

10 Driving tool 11 Output part 12 Combustion chamber 13 Ignition device 14 Cylinder head 15 Cylinder 15a First protruding cylinder part 15b Second protruding cylinder part 16 Piston 17 Driver 18 Body housing 19 Nose part 19a Injection port 20 Grip 21 First split piece 21a Front support 21b Rear support 22 Second split piece 22a Front support 23 Trigger operation part 24 Trigger switch 25 Control device 26 Battery mounting part 27 Gas can storage part 28 Magazine 30 First connection part 31 Second connection part 32 Shaft member 33 Collar 34 Elastic member 35 Nut 36 Connection part 37 Flange 38 Receiving groove 39 Elastic member 40 Coupler 50 Battery pack G1, G2 Gap D1 Axial direction of output part D2 Axial direction of grip D3 Direction perpendicular to the axial direction of output part

Claims (4)

An output unit that generates kinetic energy to launch the fastener,
A grip for the user to grip, and
The body housing that covers the output section and
Equipped with
The output unit includes a piston to which a driver for striking the fastener is coupled, and a cylinder that slidably guides the piston.
A connection portion with the grip is integrally formed on the cylinder, and the connection portion is integrally formed.
The output unit and the grip are connected to each other with a movable gap when the output unit is operated, and an elastic member is provided in the gap. .. The output unit and the grip are in at least two directions of an axial direction of the output unit and a direction orthogonal to the axial direction in a plane specified by the axis of the output unit and the axis of the grip. The driving tool according to claim 1, wherein the tool is relatively movable. The first or second aspect of the present invention, wherein the output unit and the grip are connected by a shaft member that individually penetrates the shaft member, and the elastic member is arranged around the shaft member. Driving tool. The driving tool according to any one of claims 1 to 3, wherein a plurality of connecting portions between the output unit and the grip are provided along the axial direction of the output unit.

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