WO2008032572A1

WO2008032572A1 - Gas combustion-type driving tool

Info

Publication number: WO2008032572A1
Application number: PCT/JP2007/066763
Authority: WO
Inventors: Jyunichi Tamura; Katsuhiko Murayama; Masakazu Konishi
Original assignee: Max Co., Ltd.
Priority date: 2006-09-13
Filing date: 2007-08-29
Publication date: 2008-03-20
Also published as: JP5082355B2; JP2008068346A

Abstract

A gas combustion-type driving tool has a sending piston-cylinder mechanism (7) for sending to a nose section (6) a sending claw (23) engaging with and disengaging from connected nails received in a magazine. A holding mechanism (100) using a check claw (30) and a ratchet (31) stably holds a nail in the nose section (6) until a driver (11) starts to hammer the nail received in the nose section (6) by using high-pressure combustion gas produced by combustion of a mixture gas. Further, a delay structure (200) using a long hole (37) and an engagement shaft (38) engaging with the long hole (37) delays receding of the sending claw (23) until thedriver (11) starts to hammer the nail received in the nose section (6) by using high-pressure combustion gas produced by combustion of a mixture gas.

Description

Specification

Gas fired driving tool

Technical field

The present invention acts on a combustion chamber that explosively burns a mixed gas obtained by stirring and mixing flammable gas and air, and a striking piston accommodated in this striking cylinder. The impact piston is driven impactively in the impact cylinder, and a nose portion that slides and guides a driver coupled to the lower surface side of the impact piston to drive out a nail, and a magazine placed below the nose portion. A feed piston and a cylinder mechanism for reciprocating in a forward nail feed direction and a backward retraction direction for feeding a feed claw engaged with and disengaged from a connecting nail accommodated in a nose portion side to a gas combustion type driving tool It is.

Background art

[0002] Conventionally, a nailing machine that uses the combustion pressure of a mixed gas to supply devices that supply fasteners (nails) has been proposed in a nailing machine that drives nails using the pressure of combustion gas generated by burning a mixed gas (For example, Patent Document 1).

Patent Document 1: Japanese Utility Model Publication No. 5-72380

[0003] In the nailing machine described above, when the combustion chamber force combustion gas is taken out and the nail is fed out using the gas pressure, the feeding claw is retracted to feed out the next nail simultaneously with the driving of the driver. For this reason, the holding of the nail fed into the nose portion is released, and the state of the nail inside the nose portion becomes unstable. As a result, the driver may not be able to reliably drive the nail into the member, and a nail breakage may occur or a trouble may occur in which the nail is clogged in the nose portion.

Disclosure of the invention

[0004] One or more embodiments of the present invention can be achieved by operating the striking piston 'cylinder mechanism with high-pressure combustion gas to drive the nail in the nose portion into the material to be driven, and simultaneously operating the feed piston' cylinder mechanism. Provided is a gas-fired driving tool that keeps the nail in the nose portion stable when the nail is fed into the nose portion, and allows the driver to drive the nail into the driven material reliably. [0005] According to a first aspect of the present invention, a gas combustion type driving tool includes a combustion chamber that explosively burns a mixed gas obtained by stirring and mixing a combustible gas and air, Combustion gas is made to act on the striking piston accommodated in the striking cylinder to drive the striking piston in shock, and the driver coupled to the lower surface of the striking piston and the driver are slidably guided. Reciprocating in a forward nail feed direction and a backward retract direction in which a nose portion for projecting a nail and a feed claw disposed below the nose portion and engaged with a connecting nail housed in a magazine are fed to the nose portion side. A feed piston and a cylinder mechanism. Further, the gas combustion type driving tool is engaged with a connecting nail that is fed to the nose portion by the feed claw, and the impact piston is driven by the high-pressure combustion gas generated by the combustion of the mixed gas, and the driver drives the nail. In this case, a holding mechanism for stably holding the leading nail of the connecting nail in the nose portion is provided.

[0006] According to a second aspect of the present invention, a delay structure may be provided in place of the holding mechanism so that the movement of the feed pawl is delayed with respect to the retracting direction of the feed piston. .

[0007] According to the first aspect described above, the start of the driver is started simultaneously with the start of the striking piston 'cylinder mechanism and the start of the feed piston' cylinder mechanism by the high-pressure combustion gas generated by burning the mixed gas. When the feed pawl starts to retract, the nail is held by the holding mechanism! /, So the nail stays in the nose until the driver starts hitting the nail. It will be in a stable state. For this reason, since the driver can hit the nail correctly, troubles such as breakage of the nail in the nose portion or clogging of the nail can be avoided.

[0008] Further, according to the second aspect described above, the activation of the impact piston / cylinder mechanism by the high-pressure combustion gas generated by burning the mixed gas and the activation of the feed piston / cylinder mechanism are simultaneously started. The force at the same time as the start of the retraction of the feed piston is delayed from the start of the retraction of the feed piston, so the driver starts driving the nail when the retraction of the feed claw starts. Yes. For this reason, the nail in the nose portion is held by the feeding nail for a short time, so that the nail can be reliably driven with a simple structure.

[0009] Other features and advantages will be apparent from the description of the examples and the appended claims. Brief Description of Drawings

[0010] [Fig. 1] A longitudinal sectional view of a side surface showing a main part of a gas combustion type driving tool according to an exemplary embodiment of the present invention.

[Fig.2] Longitudinal sectional view of the front of the gas-fired driving tool

[Fig. 3 (a)] Feed piston 'Cylinder mechanism explaining the movement of the feed piston and the function of the holding mechanism

[Fig. 3 (b)] Cross section of feed piston 'cylinder mechanism explaining the movement of the feed piston and the function of the holding mechanism

[Fig. 4 (a)] Longitudinal section of the nose to explain the contact arm pressed against the workpiece

[Fig. 4 (b)] X-X sectional view of Fig. 4 (a)

[Fig. 5 (a)] Vertical section of the nose section explaining the state where the driver has started driving the nail into the workpiece.

[Fig. 5 (b)] X-X cross section of Fig. 5 (a)

[Fig. 6 (a)] Longitudinal section of the nose to explain the driver driving the nail into the workpiece

[Fig. 6 (b)] X-X cross section of Fig. 6 (a)

FIG. 7 is a cross-sectional view of a nose portion illustrating another example of a holding mechanism

[Fig. 8 (a)] Cross section of the nose section explaining the feed pawl delay mechanism of the feed piston 'cylinder mechanism

[Fig. 8 (b)] Cross section of nose section explaining the feed pawl delay mechanism of the feed piston 'cylinder mechanism

[FIG. 8 (c)] Cross section of nose portion explaining the feed pawl delay mechanism of the feed piston 'cylinder mechanism

Explanation of symbols

[0011] 5 Combustion chamber

4 Stroke piston 'cylinder mechanism

6 Nose section 7 Feed piston 'cylinder mechanism

9 Stroke cylinder

10 Stroke piston

11 Driver

15 Contact arm

23 Feeding claw

100 holding mechanism

N nails

BEST MODE FOR CARRYING OUT THE INVENTION

[0012] <First exemplary embodiment>

Figure 1 shows the body of the gas-fired nailer as a gas-fired driving tool. The body 1 is provided with a grip 2 and a magazine 3, and is provided with a striking piston 'cylinder mechanism 4, a combustion chamber 5, a nose 6 and a feed piston' cylinder mechanism 7.

In the striking piston / cylinder mechanism 4, the striking piston 10 is slidably accommodated in the striking cylinder 9, and a driver 11 is integrally coupled to the bottom of the striking piston 10.

The combustion chamber 5 includes an upper end surface of the impact piston 10, an impact cylinder 9, an upper wall (cylinder head) 13 formed inside the upper housing 12, and an annular movable sleeve 14 disposed therebetween. Formed by. The closed combustion chamber 5 is formed by moving the movable sleeve 14 upward, and the upper portion of the combustion chamber 5 communicates with the atmosphere by moving downward.

As shown in FIG. 2, the movable sleeve 14 is linked to a contact arm 15 via a link member 19. The link member 19 is formed by extending an arm portion 19b along the outer peripheral portion of the striking cylinder 9 from the end portion of the bowl-shaped bottom portion 19a disposed below the striking cylinder 9. The upper end of the arm portion 19b is connected to the movable sleeve 14, and the bowl-shaped bottom portion 19a is urged downward by a spring 29 provided between the lower surface of the striking cylinder 9.

The contact arm 15 is provided so as to be slidable up and down along the nose portion 6. The tip 15a of the contact arm 15 protrudes from the nose 6 and, together with the nose 6, the tip 15a By pressing against the material to be driven P, it moves upward relative to the nose portion 6.

[0017] Since the lower surface of the bowl-shaped bottom portion 19a of the link member 19 is engaged with the upper end 15b of the contact arm 15, the contact arm 15 is relatively moved upward by pressing the nose portion 6 against the workpiece P. And the link member 19 is pushed up against the spring 29 to move the movable sleeve 14 upward. As a result, the combustion chamber 5 is shielded from the atmosphere, and a sealed combustion chamber 5 is formed.

[0018] On the other hand, when the nail driver is lifted by a reaction generated immediately after nail driving, the contact arm 15 moves downward along the nose portion 6 by its own weight. On the other hand, the pressure in the combustion chamber 5 is negative immediately after nailing, and when the striking piston 10 rises to its original position and the combustion chamber 5 is opened to the atmosphere, the movable sleeve 14 and the link member 19 are connected to the panel 29. To move downward relative to each other, and again engage with the contact arm 15 as shown in FIGS.

[0019] The upper housing 12 is provided with an injection nozzle 17 communicating with the gas container and an ignition plug 18 for igniting and burning the mixed gas. Further, the upper housing 12 has a rotary fan 20 for agitating the combustible gas injected into the combustion chamber 5 with the air in the combustion chamber 5 to generate a mixture gas having a predetermined air-fuel ratio in the combustion chamber 5. Is provided.

[0020] The nose portion 6 guides the sliding of the driver 11 and opens to the magazine 3

As shown in FIG. 3 (a), the feed piston / cylinder mechanism 7 has a feed claw 23 connected to the tip of a feed piston 22 slidably accommodated in the feed cylinder 21, together with the feed piston 22. The feed claw 23 is engaged with the connecting nail N accommodated in the magazine 3 and reciprocated in the feed direction of the nail fed to the nose 6 side and in the opposite retreat direction as shown in FIG. To do. The front side of the feed cylinder 21 of the feed piston cylinder mechanism 7 communicates with the combustion chamber 5 via a gas line 26 (see FIG. 1). A spring 27 is provided behind the feed cylinder 21 to urge the feed piston 22 in the nail feed direction at all times. The feed piston 22 reciprocates due to the balance between the pressure from the gas pipe 26 and the force of the spring 27.

[0022] As shown in Fig. 3 (a), when the feed piston 22 is urged by the spring 27 and moves to the moving end in the feed direction, the tip nail N1 of the connecting nail N In exit 24 Pushed in. At this time, since the check claw 30 described later is engaged with the next nail N2, the connection nail N connected by the wire W does not move and the tip nail N1 is held in the injection port 24. It has come to be.

[0023] As shown in FIG. 3 (b), when the feed piston 22 moves in the retracting direction, the feed claw 23 is retracted to a position where it can engage with the third nail N3. When 22 is pushed forward by the spring 27 and moves forward, the second nail N2 is pushed into the injection port 24 of the nose portion 6.

[0024] By the way, the high-pressure combustion gas generated in the combustion chamber 5 causes the combustion gas to be sent to the feed piston 'cylinder mechanism 7 via the gas pipe 26 when the impact piston 10 is driven. The pressure in 21 rises and feed piston 22 moves in the return direction against spring 27. Since the timing at which the feed piston 22 moves and the timing at which the striking piston 10 is moved down are the same, the feed claw 23 has moved backward before the driver 11 hits the nail in the nose 6 and the nose. There is a possibility that the nail in the part 6 becomes unstable. In the conventional nailing machine, when the driver hits the unstable nail, the nail may be bent or clogged in the nose. For this reason, in the nailing machine according to the first exemplary embodiment, the nose portion 6 is provided with a holding mechanism 100 for stably holding the nail in the nose portion 6.

The holding mechanism 100 includes a check claw 30 and a ratchet 31. The check pawl 30 is urged by the spring 32 so that the tip 30a protrudes into the connecting nail passage 35. At the time of protrusion, the next nail N1 of the connecting nail is positioned in the injection port 24. It engages with nail N2 (see Fig. 3 (a)).

On the other hand, the ratchet 31 is disposed so that the end surface 31a of the tip is tangent to the inner wall surface of the injection port 24, and is urged by the spring 33 so that the tip 31b protrudes into the passage 35 of the connecting nail. The wire W connecting the nail N is pressed against the inner wall of the passage 35 and held so that the leading nail N1 is stabilized in the injection port 24 (see FIG. 3 (b)).

Next, an operation mode of the holding mechanism 100 will be described. First, when the nail is driven, as shown in FIG. 4 (a), the tip of the nose portion 6 is strongly pressed against the workpiece P to move the contact arm 15 relatively upward. The bottom surface of the bowl-shaped bottom portion 19a of the link member 19 is a contact. Since the upper end 15b of the arm 15 is engaged, the bowl-shaped bottom portion 19a rises by compressing the spring 29. As a result, the movable sleeve 14 connected to the upper end of the link member 19 moves upward to form a sealed combustion chamber 5. Further, combustible gas is injected from the injection nozzle 17 into the combustion chamber 5, and the rotary fan 20 rotates to stir and mix the combustible gas and air.

[0028] In this state, as shown in FIG. 4 (b), the feed piston 22 is urged by the spring 27 to move to the moving end in the feed direction, and the leading nail N1 of the connecting nail N Pushed into the outlet 24, the check claw 30 is engaged with the next nail N2. For this reason, the connecting nail N connected by the wire W does not return, and the tip nail N1 is housed in the injection port 24. At the bottom 31c of the ratchet 31, guide the nails to return to the passage 35 when the tip nail N1 is driven!

[0029] Next, when the trigger 16 is pulled, the spark plug 18 ignites the mixed gas, and the mixed gas burns and expands explosively. The pressure of the combustion gas acts on the upper surface of the striking piston 10 and drives the striking piston 10 downward. As a result, as shown in FIG. 5 (a), the driver 11 hits the leading nail N1 supplied into the nose portion 6. At this time, the wire W connecting the connecting nail N is pressed against the inner wall of the passage 35 by the ratchet 31, so the side surface of the driver 11 sliding down the injection port 24 and the end surface 31a of the tip of the ratchet 31 Disconnected by. The combustion gas drives the striking piston 10 downward, and at the same time, is sent to the feed cylinder 21 of the feed piston / cylinder mechanism 7 through the gas line 26. As a result, the feed piston 22 moves backward simultaneously with the activation of the striking piston 10 (see FIG. 5 (b)).

When the feed piston 22 moves backward, the feed of the connecting nail by the feed claw 23 attached to the tip of the feed piston 22 is released. On the other hand, since the connecting nail N is held by the check pawl 30 and the ratchet 31 so as not to move, the leading nail N1 connected by the wire is in a stable state in the injection port 24. As a result, the driver 11 can reliably hit the head of the leading nail N1 and reliably drive the leading nail N1 into the driven material P as shown in FIG.

[0031] As described above, when the nail fed into the injection port 24 by the feed claw 23 is driven by the high-pressure combustion gas generated by the combustion of the mixed gas in the combustion chamber 5, the striking piston 10 is driven. At the same time, the feed piston 22 is retracted by being sent to the feed piston 'cylinder mechanism 7, and the feed pawl 23 attached to the feed piston 22 is also retracted to disengage from the leading nail. On the other hand, it was provided in the nose section 6. The leading nail is held in the injection port 24 in a stable state by the holding mechanism 100 while it is driven into the workpiece P. Further, the lower portion 31c of the ratchet 31 guides the nail foot so that it does not return into the passage 35 when driven. For this reason, the driver 11 can reliably hit the nail in the nose portion, and troubles such as breakage of the nail or clogging of the nail in the nose portion can be avoided.

Note that the holding mechanism 100 described above is a force composed of two members, a check claw 30 and a ratchet 31.

As shown in FIG. 7, a check claw 31d may be formed on the ratchet 31, and the connection nail N may not be returned by the check claw 31d.

Instead of the holding mechanism 100 constituted by the ratchet 31 and the check pawl 30 of the first exemplary embodiment, a delay structure 200 in which the feed pawl 23 moves backward with a time difference when the feed piston 22 moves backward is used. It may be provided in the feed piston / cylinder mechanism 7.

As shown in FIG. 8, the delay structure 200 includes a long hole 37 formed in the axial direction at the tip of the feed piston 22. The feed claw 23 is connected to the feed piston 22 by engaging the engagement shaft 38 of the feed claw 23 with the elongated hole 37. If the feed piston 22 does not move by the length of the long hole 37, the feed claw 23 will not start moving.

According to this delay mechanism, as shown in FIG. 8 (a), when the feed piston 22 is advanced to the maximum in the feed direction, the feed claw 23 is pushed by the shaft 38 at the rear end of the slot 37. The leading nail N1 is fed into the injection port 24 and the leading nail N1 is stably held in the injection port 24 by the front end surface of the feeding claw 23.

[0036] When the mixed gas in the combustion chamber 5 is burned by pulling the trigger 16, the high-pressure combustion gas acts on the striking piston 10, and at the same time, is sent to the feed cylinder 21 via the gas line 26 and to the spring 27. The force to reverse the feed piston 22 against the long hole 37 The movement of the feed claw 23 remains stopped and the state where the leading nail N1 is held in the injection port 24 is maintained (Fig. 8 (b )), And when the tip of the long hole 37 engages the shaft 38, the feed claw 23 begins to retract. In other words, the movement of the feed claw 23 starts after the feed piston 22 has been retracted by the length of the long hole 37, and when the feed piston 22 is retracted to the maximum, the tip of the feed claw 23 is engaged with the nail to be driven next. The nail is ready to be sent out to the injection port 24 (see FIG. 8 (c)). [0037] As described above, the striking piston 10 is driven by the high-pressure combustion gas generated by the combustion of the mixed gas. At the same time, the feed piston 22 also moves backward. After the feed piston 22 starts moving, the feed claw 23 starts moving. There will be a time lag by 37 long holes. During this time lag, the front nail N1 is held by the feed claw 23 in the injection port 24, and the driver 1 1 can reliably hit the front nail N1, so the injection port has a simple structure. The force S can be used to realize a gas-fired driving tool that can avoid problems occurring between the nail and the driver within 24.

[0038] In the delay structure 200, the elongated hole 37 is formed in the feed piston 22 and the engagement shaft

Force formed by the feed pawl 23 38 The engagement shaft 38 may be formed on the feed piston 22, and the long hole 37 may be formed on the feed pawl 23.

[0039] Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. It is.

[0040] This application is based on a Japanese patent application filed on September 13, 2006 (Japanese Patent Application No. 2006-248410), the contents of which are incorporated herein by reference.

Industrial applicability

[0041] The present invention can be used for a gas combustion type driving tool provided with a feed piston cylinder mechanism that reciprocates a feed claw engaged with and disengaged from a connecting nail accommodated in a magazine.

Claims

The scope of the claims

[1] A feed piston 'cylinder mechanism that feeds a feed claw that engages and disengages to a connecting nail housed in a magazine to the nose portion side;

A gas combustion type comprising: a holding mechanism that engages with the connecting nail fed by the feeding nail and holds the connecting nail so that the leading nail is stabilized in the nose even when the feeding nail is released. Driving tool.

[2] In addition,

A combustion chamber for burning a mixed gas of combustible gas and air in order to generate high-pressure combustion gas as power for driving out the nail;

A gas line communicating the combustion chamber and the feed piston 'cylinder mechanism;

A spring that urges the feed piston of the feed piston cylinder mechanism in the nail feed direction, and

The feed piston reciprocates according to the balance between the pressure from the gas pipe and the force of the spring.

The gas combustion type driving tool according to claim 1.

[3] The gas combustion type driving tool according to claim 2, wherein the holding mechanism includes a check claw and a ratchet.

[4] A feed piston 'cylinder mechanism that feeds a feed claw that engages and disengages to a connecting nail accommodated in a magazine to the nose portion side;

A delay structure that delays the withdrawal of the feed claw until the driver starts striking the nail in the nose,

A gas-fired driving tool.

[5] In addition,

A spring that urges the feed piston of the feed piston cylinder mechanism in the nail feed direction, and The feed piston reciprocates according to the balance between the pressure from the gas pipe and the force of the spring.

The gas combustion type driving tool according to claim 4.

6. The gas combustion type driving tool according to claim 5, wherein the delay structure includes a slot formed in the feed piston and an engagement shaft of the feed claw engaged with the slot.

7. The gas combustion type driving tool according to claim 5, wherein the delay structure includes an elongated hole formed in the feeding claw and an engagement shaft of the feeding piston engaged with the elongated hole.