WO2011001988A1

WO2011001988A1 - Nailing machine

Info

Publication number: WO2011001988A1
Application number: PCT/JP2010/061076
Authority: WO
Inventors: 泰宣粟飯原; 康介森脇
Original assignee: マックス株式会社
Priority date: 2009-06-29
Filing date: 2010-06-29
Publication date: 2011-01-06
Also published as: JP2011005619A; TW201109132A

Abstract

Disclosed is a nailing machine provided with: a piston (6) which is slidably disposed in a cylinder (4); a plate-like driver (5) which is joined to a driver holder (6b) provided on the piston (6); a pin mounting hole (22) which is formed through the upper section of the aforementioned driver (5); a protruding section (23) which is formed in a protruding manner so as to protrude in a periphery section of the pin mounting hole (22); a fitting groove (18) which is formed creating an opening in the aforementioned driver holder (6b) and in which the aforementioned driver (5) fits; a pinhole (19) which is formed to traverse the aforementioned driver holder (6b); and a fixing pin (21) which is inserted through and connects the aforementioned pinhole (19) and the aforementioned pin mounting hole (22), and which joins the driver (5) to the aforementioned driver holder (6b).

Description

Nailer

The present invention relates to a mounting structure of a piston driven in driving and a driver for driving a nail integrally coupled to the piston in a nailing machine.

Generally, a nailing machine for driving a finish nail (finishing nail) or staple is provided with a plate-like driver in accordance with the shape of an injection port to be guided when driving these nails. On the other hand, as a coupling with the piston, a structure in which a male screw is formed in the driver and a female screw is formed in the piston and these are screw-coupled is common. This joint structure is highly reliable in terms of strength. However, in order to employ this coupling structure, it is necessary to manufacture a plate-shaped driver by cutting a round bar having a male screw diameter into a plate shape. Thus, in order to manufacture a plate-shaped driver, processing time, material cost, and processing cost will be required.

Therefore, Patent Document 1 forms a fitting groove in the piston, fits the upper end of a plate-like driver as a whole into this fitting groove, and allows the pin to pass through a pin hole provided in the piston and the driver, A structure is disclosed in which a piston and a driver are joined by a pin.

In the nailing machine, when the piston is driven, the piston collides with a bumper at the bottom of the cylinder, whereas an inertial force acts on the driver. For this reason, in the pin coupling structure of patent document 1, stress concentrates on the coupling | bond part of a pin and a pin hole. In particular, since the strength of the pin hole is not sufficient, the frequency of replacement of the driver and the piston is increased. For this reason, the pin coupling structure of Patent Document 1 is conventionally used mainly in small nailers.

One way to reduce the stress is to increase the cross-sectional area of the pin hole. However, in order to increase the area of the pin hole, the driver holder must also be increased. For this reason, there is a limit to the method of increasing the area of the pin hole due to the relationship with the piston and the bumper. Further, since the thickness of the lower part of the driver is determined by the nail, the method of increasing the strength by thickening only the upper part of the driver still increases the manufacturing cost.

Japan, Japanese Patent Laid-Open No. 9-109056

One or more embodiments of the present invention provide a nailing machine that can reduce the driver pin hole stress caused by inertial force, improve the coupling strength between the driver and the piston, and reduce the cost. provide.

According to one or more embodiments of the present invention, the nailing machine includes a piston 6 slidably disposed in the cylinder 4 and a plate-like driver 5 coupled to a driver holder 6 b provided on the piston 6. A pin attachment hole 22 penetratingly formed in the upper portion of the driver 5, a protruding edge 23 protruding from the peripheral edge of the pin attachment hole 22, and an opening formed in the driver holder 6b. The fitting groove 18, the pin hole 19 formed so as to cross the driver holder 6b, the pin hole 19 and the pin mounting hole 22 are continuously inserted, and the driver 5 is inserted into the driver holder 6b. And a fixing pin 21.
According to this structure, when the piston is driven at the time of driving the nail, the piston collides with the bumper at the bottom of the cylinder, whereas the driver is subjected to inertial force. Although stress concentrates on the pin mounting hole, the pin mounting hole is reinforced by the protruding edge. Therefore, the stress of the pin mounting hole is reduced, and the coupling strength between the driver and the piston can be improved.

The nailing machine having the above-described structure is further provided between the fitting groove 18 of the driver holder 6b and the driver 5, and the inner surface of the fitting groove 18 and the surface of the driver on the projecting edge 23 side. You may provide the adjustment part (24,28,29) which fills the clearance gap between these.
According to this structure, an adjustment portion is provided between the fitting groove of the driver holder and the driver to fill a gap between the inner surface of the fitting groove and the surface on the protruding edge side of the driver. Therefore, a sufficient contact surface between the piston 6 and the driver 5 is ensured, and the mounting state of the driver 5 can be stabilized.

The adjusting

portions

24 and 28 may be fitted to the protruding edge portion 23.
According to this structure, since the adjusting portion is fitted to the protruding edge portion, the protruding edge portion is reinforced by the adjusting portion, and the coupling strength between the driver and the piston can be further improved. Therefore, the stress applied to the pin mounting hole is further reduced by the protruding edge portion reinforced by the adjusting portion.

The piston 6 may be composed of a large-diameter piston main body 6a and a small-diameter driver holder 6b provided below the main body 6a.

The piston 6 may be composed of an annular piston main body 6a and a columnar driver holder 6b screwed into the piston main body 6a.

The protruding portion 23 may be formed to protrude from one side surface of the driver 5. Alternatively, the protruding portion 23 may be formed to protrude from both side surfaces of the driver 5.
According to this structure, the coupling strength between the piston and the driver can be selected according to the use of the nailing machine.

Other features and effects will be apparent from the description of the embodiments and the appended claims.

1 is a longitudinal side view of a pneumatic nailer according to an exemplary embodiment of the present invention. Fig.2 (a) is a front view of the piston which couple | bonded the driver. FIG. 2B is a cross-sectional view taken along line AA in FIG. FIG. 3A is a front view of the upper portion of the driver. FIG. 3B is a cross-sectional view taken along the line YY in FIG. FIG. 4A and FIG. 4B are cross-sectional views showing other coupling modes of the driver and the piston, respectively. FIG. 5 is a cross-sectional view showing another embodiment of the protruding portion. Fig.6 (a) is a front view which shows other embodiment of an adjustment part. FIG. 6B is a cross-sectional view taken along the line CC in FIG. Fig.7 (a) is a front view which shows other embodiment of an adjustment part. FIG. 7B is a cross-sectional view taken along the line DD in FIG. FIG. 8A and FIG. 8B are longitudinal sectional views showing other forms of the piston, respectively.

FIG. 1 is a longitudinal sectional view of a pneumatic nailer according to an exemplary embodiment of the present invention. The nailing machine of the present invention is used to drive finish nails, staples and the like. Reference numeral 1 denotes a body, 2 denotes a grip, and 3 denotes a magazine. Inside the body 1 are a cylinder 4, a piston 6 slidably accommodated in the cylinder 4 and a driver 5 integrally coupled, and an air chamber 7 (connected to a compressed air supply source) in the cylinder 4. A head valve 8 for driving and controlling the piston 6 by supplying and discharging the compressed air and a trigger valve 9 for controlling the operation of the head valve 8 are arranged. A nose portion 10 is provided at the tip of the body 1, and the driver 5 is guided so as to slide on the nose portion 10. The nose portion 10 is configured such that the tip of the magazine 3 is opened, and nails (not shown) in the magazine 3 are supplied to the nose portion 10. The trigger valve 9 is disposed at the base of the grip 2, and the tip of the valve stem 11 of the trigger valve 9 is disposed opposite to the trigger lever 12.

In the nailing machine, the trigger valve 9 is connected to the air chamber 7 when not operating. The compressed air taken in from the air chamber 7 is supplied to the head valve 8 via an air passage (not shown). Thus, the head valve 8 closes the upper end of the cylinder 4 as shown in FIG. When driving, when the trigger lever 12 is operated and the valve stem 11 of the trigger valve 9 is pushed in, the trigger valve 9 is activated and the head valve 8 is connected to the atmosphere. Then, the upper end of the cylinder 4 is opened (not shown), and the compressed air in the air chamber 7 is instantaneously supplied into the cylinder 4. As a result, the driver 5 is driven together with the piston 6, and the nail in the nose portion 10 is hit and driven into the material to be driven. Thereafter, when the trigger lever 12 is released, the trigger valve 9 again connects the head valve 8 to the air chamber 7 as shown in FIG. The cylinder 4 is closed with respect to the air chamber 7, and at the same time, the cylinder 4 is connected to the atmosphere and exhausted. As a result, the piston 6 returns to the initial position, and the next nail driving operation is prepared. The mechanism for controlling the driving of the nail driver by operating the trigger valve 9 and the head valve 8 is the same as that known in the art.

Incidentally, as shown in FIGS. 2 (a) and 2 (b), the piston 6 is integrally formed from a large-diameter piston body 6a and a small-diameter driver holder 6b below the large-diameter piston body 6a. The piston body 6a is formed in a columnar shape, and an annular groove 17 into which the O-ring 16 is fitted is provided on the outer peripheral surface thereof. The driver holder 6b is formed in a columnar shape, and a slit-like fitting groove 18 that opens downward is formed at the center thereof. In addition, a pin hole 19 is formed in the driver holder 6b so as to cross the fitting groove 18 perpendicular to the center line O of the piston 6.

The driver 5 is formed in a plate shape, and is fitted and fixed in the fitting groove 18 of the driver holder 6b.

As shown in FIGS. 3A and 3B, a rectangular plate-like fitting portion 20 is formed on the driver 5. The size of the fitting portion 20 is formed substantially the same as the fitting groove 18 of the piston 6. Further, the fitting portion 20 is formed with a pin mounting hole 22 for inserting the fixing pin 21. An annular protruding edge 23 is formed in a rib shape on the peripheral edge of the pin mounting hole 22. The protruding portion 23 may be formed by burring. Further, a metal washer 24 is provided on the surface of the upper portion of the driver 5 on the side of the protruding edge 23 as an adjusting portion that fills a gap between the inner surface of the fitting groove 18 and the surface of the driver 5 on the protruding edge 23 side. It is provided by polymerization.

The washer 24 is formed to have substantially the same size as the fitting portion 20 of the driver 5, and a fitting hole 25 to be fitted to the protruding edge portion 23 is formed. The washer 24 is formed so that the thickness of the washer 24 is larger than the height of the protruding portion 23.

Next, when the piston 6 and the driver 5 are coupled, the driver 5 and the washer 24 are superposed (it is not necessary to superpose) and are fitted into the fitting groove 18 of the driver holder 6b of the piston 6. At this time, since the pin hole 19 and the pin mounting hole 22 of the driver 5 are aligned, the fixing pin 21 is inserted from one side of the pin hole 19 and penetrated from the pin mounting hole 22 of the driver 5 to the other side of the pin hole 19, Further, the fixing pin 21 may be prevented from coming out by crimping the end portion or by pressing the fixing pin 21 and the pin hole 19 together. As a result, the driver holder 6b and the driver 5 are coupled as shown in FIGS. 2 (a) and 2 (b).

According to the mounting structure of the piston 6 and the driver 5 described above, when the piston 6 is driven when the nail is driven, the piston 6 collides with the bumper 26 at the bottom of the cylinder, whereas an inertial force acts on the driver 5. Stress concentrates at the joint between the fixing pin 21 and the driver 5. The coupling portion is the pin mounting hole 22 of the driver 5 and the protruding edge portion 23 at the peripheral portion thereof, but the bonding strength between the driver and the piston can be improved by the protruding edge portion 23. Since the washer 24 and the projecting edge portion 23 are in the fitted state, the washer 24 and the driver 5 are integrated, and the inner surface of the fitting groove 18 and the surface of the driver 5 on the projecting edge portion 23 side. Since the gap between them is filled, the mounting state of the driver 5 is stabilized.

Thus, the stress concentration occurs at the edge (peripheral edge) of the pin mounting hole 22, and in order to prevent minute deformation from occurring at the hole edge due to inertial force, the peripheral edge of the pin mounting hole 22 of the driver 5. It is effective to give rigidity by forming the projecting edge portion 23 on the surface. Further, since the driver 5 is fitted into the fitting groove 18 of the piston 6 by fitting the washer 24 with the projecting edge portion 23, the contact surface between the piston 6 and the driver 5 is sufficiently secured, and the mounting state of the driver 5 is secured. Since the thickness of the protrusion 23 is larger than the height of the protrusion 23, the protrusion 23 does not contact the inner surface of the fitting groove 18. Sufficient rigidity can be given to the peripheral edge portion near the pin mounting hole 22.

In addition, the washer 24 is formed with a fitting hole 25 for fitting with the protruding edge 23 of the driver 5, so that the positioning is ensured by fitting and the play when assembled to the piston 6 is suppressed. Can do.

If the washer 24 is sized to fit into the fitting groove 18, the thickness thereof may be substantially the same as the height of the projecting edge 23 as shown in FIG. 4 (a). The washer 24 and the projecting edge portion 23 may be formed separately, and the projecting edge portion 23 and the fitting hole 25 may be fitted together and fitted into the fitting groove 18. When the edge 23 is formed, the washer 24 may be inserted into the mold and processed. In the latter case, a projecting edge portion 23 is formed along the inner surface of the fitting hole 25 of the washer 24, and the washer 24 and the driver 5 are strongly pressed and are integrally coupled.

Further, the protruding edge portion 23 is not limited to a form in which the protruding portion 23 is formed to protrude on one side of the fitting portion 20 of the driver 5. As shown in FIG. 4B, it may be formed on both sides of the fitting portion 20 by forging. In this case, the washer 24 is also disposed on both sides of the fitting portion 20. In this manner, the protruding portion 23 may be formed so as to protrude on one side surface or both side surfaces of the driver 5 according to the use of the nail driver.

Furthermore, the pin mounting hole of the driver is not limited to a perfect circle, but may be an ellipse, a long hole, or a polygonal shape.

Further, the piston body 6a and the driver holder 6b are not necessarily integral. A structure in which separate members are combined may be used.

The projecting edge portion 23 may not be annular. You may form only in the upper part of the pin attachment hole which the stress at the time of driving generate | occur | produces. Further, the projecting edge portion 23 may be configured separately from the driver 5. For example, as shown in FIG. 5, a configuration in which a cylindrical protruding edge member 27 including a fitting portion 26 having a small outer diameter and a large protruding edge portion 23 is integrally coupled to the driver 5 by friction welding or the like may be employed. .

The driver holder 6b is not limited to a cylindrical shape, and may be an elliptical shape, a polygonal shape, or the like.

Further, the driver holder is provided with a washer 24 as an adjustment portion for attaching the inner surface of the fitting groove 18 of the piston 6 and the driver 5 around the projecting edge portion 23 of the driver 5 while maintaining a space between the driver holder 5 and the driver 5. However, the adjustment unit may be formed of a separate member from the driver holder 6b. For example, as shown in FIGS. 6 (a) and 6 (b), the driver holder 6b includes a driver 5 The intermediate member 28 may be fixed so as to be provided around the protruding edge 23.

However, if sufficient rigidity is secured at the edge of the pin mounting hole 22 by the projecting edge portion 23, an adjustment portion having a reinforcing function such as a washer 24 and an intermediate member 28 is not necessary. In this case, as shown in FIG. 7A and FIG. 7B, a convex portion 29 for simply attaching to the periphery of the projecting edge portion 23 while maintaining a distance from the inner surface of the fitting groove 18 of the piston 6. Should be formed.

Furthermore, the configuration of the driver holder is not limited to the above-described form. For example, as shown in FIG. 8A, a driver holder 6b having the same diameter is integrally formed at the lower portion of the piston body 6a, and a fitting groove 18 is formed in the driver holder 6b. A pin mounting hole 22 is formed, and a rib-shaped protruding edge portion 23 is formed on the peripheral edge portion of the pin mounting hole 22, and is fitted to the protruding edge portion 23 side of the driver 5. A washer 24 having a mating hole 25 is provided, and the driver 5 and the washer 24 are fitted into the fitting groove 18 of the piston 6, and the pin hole 19 formed so as to cross the piston 6 is attached to the pin of the driver 5. It is good also as a structure couple | bonded by the fixing pin 21 penetrated continuously by the hole 22. FIG.

FIG. 8B is a longitudinal sectional view of still another form of the driver holder, in which the driver holder is formed inside the piston 6, and the piston 6 is screwed into the annular piston body 6a and the inside thereof. The driver holder 6b is formed, and a fitting groove 18 is formed at the center lower portion of the driver holder 6b, and the driver 5 and the washer 24 are fitted into the fitting groove 18 of the piston 6 so as to cross the driver holder 6b. The pin hole 19 formed in this way and the pin mounting hole 22 of the driver 5 are connected by a fixing pin 21 inserted continuously.

According to the above-described configuration, the fixing pin 21 does not come off by hitting the inner peripheral surface of the piston body 6a, so that it is not necessary to prevent the caulking or the like from coming off.

8 (a) and 8 (b), the same effects as those shown in FIGS. 1 to 4 (b) can be obtained, the shapes of the washer 24 and the protruding edge 23, the driver 5 The pin attachment holes 22 and the like are not limited to those shown in the figure, as in the case of FIGS. 1 to 4B.

The present invention can be used for a connecting structure between a driver and a piston in a nailing machine.

5 Driver 6 Piston

6a Piston body

6b Driver holder 18 Fitting groove 19 Pin hole 21 Fixed pin 22 Pin mounting hole 23 Projection edge 24 Washer (Adjustment part)
25 Fitting hole 28 Intermediate member (Adjustment part)
29 Convex part (adjustment part)

Claims

A piston (6) slidably disposed in the cylinder (4);
A plate-like driver (5) coupled to a driver holder (6b) provided on the piston (6);
A pin mounting hole (22) formed through the top of the driver (5);
A projecting edge portion (23) formed to project from the peripheral edge portion of the pin mounting hole (22);
A fitting groove (18) formed in the driver holder (6b) and into which the driver (5) is fitted;
A pin hole (19) formed across the driver holder (6b);
A fixing pin (21), which is continuously inserted through the pin hole (19) and the pin mounting hole (22), and couples the driver (5) to the driver holder (6b);
Comprising
Nailer.
Further, provided between the fitting groove (18) of the driver holder (6b) and the driver (5), the inner surface of the fitting groove (18) and the surface of the driver on the projecting edge (23) side. The nailing machine according to claim 1, further comprising an adjustment portion (24, 28, 29) that fills a gap between the nail driver and the nail driver.
The nail driver according to claim 2, wherein the adjusting portion (24, 28) is fitted to the protruding edge portion (23).
The nailing machine according to claim 1, wherein the piston (6) is composed of a large-diameter piston body (6a) and a small-diameter driver holder (6b) provided at a lower portion thereof.
The nail driver according to claim 1, wherein the piston (6) includes an annular piston main body (6a) and a cylindrical driver holder (6b) screwed into the piston main body (6a). Machine.
The nailing machine according to claim 1, wherein the projecting edge (23) is formed to project from one side surface of the driver (5).
The nailing machine according to claim 1, wherein the protruding edge portion (23) is formed to protrude on both side surfaces of the driver (5).