JP2006218585A - Nailing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nailing machine capable of eliminating a machining process after forming an exhaust cover, capable of reducing manufacturing processes and manufacturing costs, and also, capable of initially reducing an impact load due to a piston striking exhaust valve rubber. <P>SOLUTION: A fixing part 11a of the exhaust valve rubber 11 is provided with a columnar guide diameter part 11c, which has a second diameter d2 substantially equal to or smaller than a first diameter d1, and a columnar latching diameter part 11b having a third diameter d3 continuous to the columnar guide diameter part 11c and larger than the guide diameter part 11c. The columnar latching diameter part 11b of the exhaust valve rubber 11 is inserted to a guide hole part 5d while making the columnar latching diameter part 11b smaller than the guide hole part 5d of the exhaust cover. The guide diameter part 11c of the exhaust valve rubber 11 is located in the guide hole part 5d. Consequently, the exhaust valve rubber 11 is fitted to the exhaust cover 5a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nail driver that drives a nail using a pressure of compressed air or the like as a power source of a piston, and more particularly, an exhaust valve rubber that absorbs piston kinetic energy when returning to top dead center, and a nail driver The present invention relates to a connection structure with an exhaust cover that constitutes a casing of a main body.

  In a nailing machine for driving a nail using a known compressed air as a driving source, as shown in FIG. 4, the nailing machine body 2 includes a housing (frame) 5 that defines a pressure accumulating chamber 6 for storing compressed air, A cylindrical cylinder 7 provided in the housing 5, a piston 8 provided in the cylinder 7 so as to be slidable up and down, and fixed to the lower surface of the piston 8, at the bottom dead center of the piston 8 A driver blade 9 extending from the lower surface of the piston to the outside lower part of the cylinder 7 and hitting a nail (not shown) by the reciprocating motion of the piston 8; A head valve (main valve) 10 that alternatively forms an air passage from the piston upper chamber 17 to the pressure accumulating chamber 6 or an air passage to the atmosphere defined by a wall portion including the upper surface of the piston 8, and above the cylinder 7 In the department An exhaust valve rubber made of an elastic material that forms an air passage 16 from the piston upper chamber 17 to the atmosphere in cooperation with the head valve 10 by contacting or non-contacting with the vertical movement of the head valve 10. 11, an upper portion of the cylinder 7 that is integrally formed with the casing 5, and includes a head valve compartment 5h that houses the head valve 10, a mounting portion 5c that mounts the fixing portion 11a of the exhaust valve rubber, and an exhaust that communicates with the atmosphere. And an exhaust cover 5 a having a hole (air passage) 15. Such a nailing machine is disclosed, for example, in Patent Document 1 below.

  In such a conventional nailing machine, the exhaust valve rubber 11 is formed of an elastic material such as rubber. This exhaust valve rubber 11 absorbs the kinetic energy of the piston 8 when it comes back to the top dead center in contact with the upper end surface 8c of the piston 8 in the central portion near the central axis of the cylinder 7 (piston 8). Abutting surface (lower end surface) 11f. Further, in the exhaust valve rubber 11, when the air pressure in the head valve control passage 13 is controlled to atmospheric pressure, the head valve 10 moves upward X so that the pressure accumulation chamber 6 and the piston upper chamber 17 above the piston 8 of the cylinder 7 communicate with each other. In this case, a valve portion (outermost peripheral portion) 11g for blocking an air passage from the piston upper chamber 17 to the atmosphere (outside of the housing 5) through the exhaust hole 15 and the exhaust passage 16 is provided. Further, the exhaust valve rubber 11 has an upper end surface 11e that is in close contact with the exhaust cover 5a, and a latching portion (protruding portion) of the exhaust cover 5a by a fixing portion (protruding portion) 11a provided in the periphery thereof. It is hooked with 5j.

  Conventionally, the exhaust cover 5a is made of a metal material (non-elastic material) such as aluminum. Therefore, the exhaust cover 5a includes the head valve compartment 5h by melting a metal material such as an aluminum alloy by die casting and pressing it into a die. After that, the inner wall portion of the head valve partitioning portion 5h was cut using a cutting tool or the like to form the latching portion (projecting portion) 5j.

  On the other hand, since the exhaust valve rubber 11 is a rubber elastic material, the latching portion (projecting portion) 11a uses a mold corresponding to the latching portion 5j of the exhaust cover 5a, and the rubber elasticity solidified in the mold. The material is formed by forcibly removing or stripping (undercut) it.

Utility Model Registration No. 2556431

  As described above, in the conventional process of forming the exhaust cover 5a by the aluminum die casting method, since the latch cover (projection) 5j or the recess 5k of the exhaust cover cannot be formed by die cutting, the base by the die casting method is used. After forming the cover, it was a complicated process in which the latching portion 5j had to be manufactured by machining.

  Accordingly, one object of the present invention is to provide a nailing machine that eliminates the machining process after forming the exhaust cover, thereby shortening the manufacturing process and reducing the manufacturing cost.

  Another object of the present invention is to provide a nailing machine that initially reduces the impact load caused by a piston that strikes an exhaust valve rubber.

  The above and other objects and novel features of the present invention will become more apparent from the following description of the present specification and the accompanying drawings.

  Of the inventions disclosed in the present application, the outline of typical ones will be described as follows.

  (1) According to the nailing machine according to the present invention, a casing that defines a pressure accumulating chamber for storing compressed air, a cylindrical cylinder provided in the casing, and a reciprocating slide in the cylinder are provided. A piston that is fixed to the lower surface of the piston, extends from the lower surface of the piston to the outside lower part of the cylinder at the bottom dead center of the piston, and strikes a nail by the reciprocating motion of the piston; An air passage from the piston upper chamber to the pressure accumulating chamber or the air passage to the atmosphere, which is provided so as to be movable up and down with respect to the upper peripheral edge of the cylinder and is partitioned by a wall portion including the upper surface of the piston, is formed. And a head valve that is provided at an upper portion of the cylinder, and abuts or does not abut against the vertical movement of the head valve, thereby cooperating with the head valve and the piston. An exhaust valve rubber made of an elastic material that forms an air passage from the upper chamber to the atmosphere, a head valve partition unit that is integrally formed with the housing in the upper part of the cylinder, and that houses the head valve, and the exhaust valve rubber In the nailing machine having a mounting portion for mounting the fixing portion and an exhaust cover having an exhaust hole communicating with the atmosphere, the mounting portion of the exhaust cover penetrates from the lower surface of the flat plate portion of the exhaust cover to the upper surface. A guide hole portion having a first diameter, and the fixing portion of the exhaust valve rubber has a columnar guide diameter portion having a second diameter substantially equal to or smaller than the first diameter, and A columnar latching diameter portion having a third diameter larger than the guide diameter portion continuous to the columnar guide diameter portion, and the exhaust valve The exhaust valve is formed by inserting the column-shaped latching diameter portion of the rubber into the guide hole portion while being smaller than the exhaust cover guide hole portion, and positioning the guide diameter portion of the exhaust valve rubber within the guide hole portion. A rubber is hooked on the exhaust cover.

  (2) According to the nailing machine of the above item (1) according to the present invention, the guide hole portion of the exhaust cover is disposed on the central axis of the piston, and the center of the piston at the top dead center of the piston. A portion corresponding to a contact surface between the portion and the exhaust valve rubber is separated from the exhaust valve rubber.

  (3) According to the nailing machine according to the above (1) or (2) according to the present invention, the guide hole portion of the exhaust cover is constituted by a concave portion disposed on the central axis of the piston, and the guide The hole is formed in the bottom of the flat plate of the recess, and the columnar latching diameter portion of the exhaust valve rubber is accommodated in the recess.

  (4) According to the nailing machine of the above item (3) according to the present invention, the exhaust valve rubber includes the guide diameter portion and the hanging portion so as to surround the columnar guide diameter portion and the latching diameter portion. 4. A cylindrical wall portion integrally formed with the stop diameter portion, and the cylindrical wall portion is disposed so as to surround an outer peripheral surface of the recess of the exhaust cover. The nailer described in.

  According to the present invention, a guide hole portion is formed in the exhaust cover, and the exhaust valve rubber has a columnar guide diameter portion having a dimension substantially equal to or less than the guide hole portion provided in the exhaust cover, and the guide A columnar retaining diameter portion having a diameter larger than that of the hole portion, and the exhaust valve valve is inserted into the guide hole portion while making the columnar retaining diameter portion of the exhaust valve rubber smaller than the exhaust cover guide hole portion. Since the rubber is hooked on the exhaust cover, the structure for attaching the exhaust valve rubber and the exhaust cover can be simplified. As a result, the exhaust cover can be easily processed.

  In addition, since the upper end surface of the exhaust valve rubber located on the opposite side of the abutting surface of the exhaust valve rubber with which the piston contacts at the top dead center is separated from the lower surface of the guide hole portion of the exhaust cover, a gap is provided. The impact load that contacts or strikes the exhaust valve rubber when returning to the dead center can be reduced initially.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted. Further, members having the same function or structure as those of the prior art or members of the present invention having the same type of function or structure will be described with the same reference numerals.

  FIG. 1 is an overall sectional view of a nailing machine according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged views showing a partial cross section of the nailing machine. First, the configuration of the entire nailing machine of the present invention will be described.

  The nailing machine 1 includes a nailing machine body 2 and a magazine 4 that houses a connecting nail 32. The nail driver main body 2 includes a part that surrounds a piston / cylinder part including a piston 8, a cylinder 7, and a pressure accumulating chamber 6 to be described later, and a part that forms a handle part 3 for gripping the nail driver 1. A housing (housing) 5 is formed. An air hose from a compressor (not shown) is connected to one end portion (right end portion) of the handle portion 3. One end portion of the magazine 4 is hooked to the lower portion of the nailing machine body 2, and the other end portion is attached to the handle portion 3 by fasteners (bolts and nuts) 41 and 42.

  Compressed air serving as a driving source for the piston 8 is stored in the pressure accumulating chamber 6 in the nailer body 2 via an air hose (not shown). A cylindrical cylinder 7 is provided in the nailing machine body 2, and a piston 8 is provided in the cylinder 7 so as to be slidable up and down. The piston 8 has a driver blade 9 attached integrally to its lower surface. The heads of the connecting nails 32 housed in the magazine 4 are sequentially hit by the tip 9 a of the driver blade 9. A lower portion of the cylinder 7 has a nose injection portion 30 that guides the driver blade 9 when the driver blade 9 is lowered in the axial direction together with the piston 8, and a workpiece such as wood from the nose injection port 30a. The nail 32 is driven out to 50. The inner diameter of the cylinder 7 is slightly larger than the outer diameter of the piston portion 8 so that the piston 8 can easily move up and down. A groove is provided in the outer peripheral portion of the piston 8, and a well-known O-ring 8a made of a flexible material such as rubber is provided in the groove to seal the inner periphery of the cylinder 7 and the piston 8. .

  An exhaust cover 5a according to the present invention, which will be described later, and an exhaust valve rubber 11 fitted to the exhaust cover 5a are provided above the cylinder 7. The exhaust cover 5a is formed with a double cylindrical head valve compartment 5h (FIG. 2). In the compartment 5h, the head valve (main valve) 10 is made of a well-known O-ring 10a made of a flexible material and It is accommodated so that it may slide up and down on the inner wall surface of this partition part via 10b. The head valve 10 is urged toward the bottom dead center by the pressing force of the head valve spring 12 and the pressing force of the compressed air flowing into the head valve control passage 13.

  The operation unit operated by the operator protrudes from the lower end of the trigger 27, the arm plate 28 rotatably attached to the trigger 27, and the nose injection unit 30, and engages with the arm plate 28. And a push lever 31 extending to the vicinity. The end portion of the push lever 31 located on the nose injection portion 30 side is slidable in the vertical direction along the outer periphery of the nose injection portion 30, and when the push lever 31 is not operated, It is biased downward by a spring (not shown).

  The head valve control passage 13 is connected to the trigger valve portion 29 on the lower end portion side thereof, and communicates with the external air of the nailing machine body 2 or the compressed air accumulated in the pressure accumulating chamber 6 in accordance with the up / down opening / closing of the plunger 29a. More specifically, the plunger 29a cooperates with a valve piston (not shown) provided in the trigger valve 29, and makes the head valve control passage 13 communicate with the atmosphere according to the vertical movement of the plunger 29a. Or it is made to communicate with the pressure accumulation chamber 6 filled with compressed air. That is, as shown in FIG. 1, when the plunger 29 a is in the lower state, in other words, when it is biased to the lower position by a coil spring (not shown) in the trigger valve portion 29, the head valve control passage 13. Communicates with the pressure accumulating chamber 6 and is supplied with compressed air. On the other hand, when the plunger 29 a is pulled upward by the arm plate 28 and the trigger 27, the head valve control passage 13 communicates with the nearby external atmosphere via the trigger valve portion 29. If the nailing operation is specifically described, the push lever 31 is pressed against the workpiece 50, the push lever 31 is pushed upward, and the arm plate 28 is pushed up. Is gripped upward, the plunger 29 a is pushed upward as described above, and the head valve control passage 13 communicates with the atmosphere via the trigger valve portion 29. As a result, the head valve 10 moves to the top dead center side in the upward direction X (see FIG. 2), the piston upper chamber 17 communicates with the pressure accumulating chamber 6, and compressed air is transferred from the pressure accumulating chamber 6 to the peripheral upper surface 8 b The piston is supplied to the piston upper chamber 17), and the piston 8 is moved downward. At this time, the lower end portion 10c of the head valve 10 is in contact with the outermost peripheral portion (valve portion) 11g of the exhaust valve rubber 11 to block the air passage communicating with the exhaust chamber 15b from the piston upper chamber 17 through the exhaust chamber 15a ( Closed). One of the exhaust chambers 15 b communicates with the exhaust chamber 15 a, and the other communicates with the atmosphere through an exhaust passage 15 provided in the upper portion of the housing (frame) 5 through the exhaust holes 15. In a state where the trigger 27 is not grasped by the operator and is opened (leaved) downward, the head valve control passage 13 communicates with the pressure accumulating chamber 6 through the trigger valve portion 29, and the compressed air in the pressure accumulating chamber 6 is transferred to the head valve. Supply to upper chamber 14. As a result, the head valve 10 is pressed toward the bottom dead center, contacts the head valve rubber 18, and blocks the piston upper chamber 17 from the pressure accumulation chamber 6. Thus, when the plunger 29a moves upward, the head valve 10 rises, the head valve 10 comes into contact with the outermost peripheral portion 11g of the exhaust valve rubber 11, and closes the passage between the pressure accumulating chamber 6 and the exhaust chamber 15b. . At the same time, the pressure accumulation chamber 6 and the upper chamber 17 of the piston 8 in the cylinder 7 communicate with each other.

  A return air chamber 22 for returning the piston 8 from the bottom dead center to the top dead center is provided on the outer periphery of the lower end of the cylinder 7, and communicates only in the direction of the return air chamber 22 from the cylinder 7 during the reciprocating stroke of the piston 8. An air passage 19 including a check valve 20 is provided, and an air passage 33 that communicates the cylinder 7 and the return air chamber 22 is provided on the outer periphery of the lower end of the cylinder 7. A piston bumper 21 for absorbing excess energy of the piston 8 after the nail 32 is driven is provided at the lower end of the cylinder 7. The lower side of the piston bumper 21 is larger than the inner diameter of the cylinder 7 so as not to move to the top dead center side of the cylinder 7. The lower inner surface of the cylinder 7 has a tapered surface that expands in the direction of the bottom dead center, which is substantially the same as the outer shape of the piston bumper 21.

  In the above configuration, the exhaust cover portion 5a and the exhaust valve rubber 11 according to the present invention will be described in more detail with reference to the partial configuration diagram of FIG.

  The exhaust cover 5a has a cylindrical recess 5g in a mounting portion 5c to which the exhaust valve rubber 11 is fitted or fitted. The bottom of the cylindrical recess 5g is a flat bottom having an upper surface 5f and a lower surface 5e, and has a guide hole 5d (for example, a round hole) penetrating from the upper surface 5f of the flat plate bottom to the lower surface 5e. The guide hole 5d has a first diameter d1. The first diameter d1 is specified to be 5.6 mm, for example. The exhaust cover 5a is made of, for example, an aluminum alloy material. Since the structure has a simple cylindrical recess 5g, the metal material of the aluminum alloy is melted by a die casting method using a die divided into upper and lower parts having a joint in the guide hole 5d. It can be formed by pressing into a die. Therefore, a special cutting process after molding the mold as in the prior art is unnecessary.

  On the other hand, as shown in FIG. 3, the exhaust valve rubber 11 has a cylindrical hooking diameter portion 11 b and a cylindrical guide diameter portion 11 c in the fixing portion 11 a of the exhaust valve rubber 11, and a cylindrical guide diameter portion. 11c has a second diameter d2 that is substantially equal to or less than or equal to the diameter d1 of the guide hole 5d of the exhaust cover 5a. The second diameter d2 is defined as 6.0 mm, which is substantially equivalent to d1, for example. Here, “substantially equivalent” means that the exhaust valve rubber 11 is made of an elastic material, so that even if the diameter d2 of the guide diameter portion 11c is slightly larger than the diameter d1 of the guide hole portion 5d, the exhaust valve rubber 11 bends. This includes a case where the guide hole 5d is inscribed. The cylindrical latching diameter portion 11b has a third diameter d3 that is larger than the second diameter d2 of the cylindrical guide diameter portion 11c. The third diameter d3 is defined as, for example, 7.2 mm. Since the exhaust valve rubber 11 is made of an elastic material (flexible material) such as rubber, the guide hole portion 5d is deformed while the column-shaped hooking diameter portion 11b of the exhaust valve rubber 11 is deformed to be smaller than the exhaust cover guide hole portion 5d. The exhaust valve rubber columnar latching diameter portion 11b is hooked on the upper surface 5f near the exhaust cover hole portion 5d by positioning the guide diameter portion 11c of the exhaust valve rubber 11 in the guide hole portion 5d. Can do.

  The dimensions d2 and d3 of the columnar guide diameter portion 11c and the columnar latching diameter portion 11b of the exhaust valve rubber 11 are molded using a mold corresponding to the exhaust cover 5a, and correspond to the guide hole portion of the mold. The dimensions are such that the mold can be released by forced removal (undercut) through the hole. In other words, the diameter d3 of the columnar latching diameter portion 11b can be set larger than the diameter d1 of the guide hole portion 5d, but it is advantageous in terms of manufacturing to restrict the range to be releasable by using a mold corresponding to the exhaust cover 5a. It becomes.

  Therefore, as described above, at the time of assembly, the column-shaped hooking diameter portion 11b and the guide diameter portion 11c of the exhaust valve rubber 11 are deformed and inserted into the guide hole portion 5d of the exhaust cover 5a while being reduced. The exhaust cover 5a is hooked. When the exhaust valve rubber 11 is disassembled from the exhaust cover 5a, the latching diameter portion 11b of the exhaust valve rubber 11 is deformed to be small by pressing the latching diameter end surface 11h of the exhaust valve rubber 11 in the same manner as when assembling. The exhaust cover 5a can be detached.

  Further, as shown in FIG. 3, the exhaust valve rubber 11 is a cylinder integrally formed with the guide diameter portion and the engaging diameter portion so as to surround the periphery of the columnar guide diameter portion 11c and the columnar engaging diameter portion 11b. The cylindrical wall portion 11j is disposed so as to surround the outer peripheral surface of the cylindrical concave portion 5g of the exhaust cover 5a. The height of the upper end surface 11e of the cylindrical wall portion 11j is defined to be greater than the height of the cylindrical recess 5g of the exhaust cover 5a, and a gap 34 is provided between the exhaust cover 5a and the exhaust valve rubber 11. That is, an abutting surface 11f is provided at the substantially central portion of the exhaust valve rubber 11 so as to absorb the kinetic energy of the piston 8 when the piston 8 returns, and the piston 8 that is in contact with the abutting surface 11f is substantially disposed. A gap 34 according to the present invention is provided between the central upper surface 8c and the lower surface 5e of the cylindrical recess 5g of the exhaust cover. The gap 34 has a dimension of 1 mm, for example. As a result, the impact load that contacts the exhaust valve rubber 11 when the piston 8 returns to the top dead center is softly absorbed until the gap 34 is filled by the initial deflection of the exhaust valve rubber 11. Thereafter, the return kinetic energy of the piston 8 is absorbed without damaging the exhaust cover 5a and the piston 8 by increasing the spring constant as much as possible. In this case, when the exhaust valve rubber 11 is bent, the exhaust valve rubber columnar retaining diameter portion 11b and the upper surface 5f in the vicinity of the exhaust cover guide hole portion 5d are separated from each other. Can be prevented. In particular, in the present embodiment, the fixed portion 11a of the exhaust valve rubber 11, the hooking portion (fitting portion) of the exhaust cover 5a, and the gap 34 between them are installed in the central portion of the shaft of the cylinder 7 or piston 8. Therefore, the impact load concentrated on the piston central axis at the top dead center due to the reciprocating motion of the piston 8 can be effectively absorbed.

  Next, a driving operation by the nail driver 1 having the above configuration will be described with reference to FIG.

  First, FIG. 1 shows a state in which an air hose (not shown) is connected to the compressed air intake of the pressure accumulating chamber 6 in the nailing machine 1 before driving. The compressed air is accumulated in the pressure accumulating chamber 6. At this time, the piston 8 is at the top dead center in the cylinder 7, and the piston 8 is guided to the cylinder 7 via the O-ring 8a. The driver blade 9 is guided in the guide hole of the nose injection part 30.

  Next, by performing both the pressing operation of the push lever 31 to the workpiece (wood) 50 and the pulling operation of the trigger 27, the arm plate 28 operates so as to press the plunger 29a upward. As a result, the head valve 10 moves to the top dead center side, and the pressure accumulation chamber 6 and the upper chamber 17 of the piston 8 in the cylinder 7 communicate with each other, whereby compressed air flows from the pressure accumulation chamber 6 into the piston upper chamber 17. To do. The piston 8 drives the nail 32 while rapidly moving to the bottom dead center by the compressed air that has flowed in. The piston 8 collides with the piston bumper 21 after driving the nail 32. The piston bumper 21 is deformed and absorbs excess energy of the piston 8.

  During the downward movement toward the bottom dead center of the piston 8, the air under the piston 8 and a part of the compressed air in the upper chamber 17 of the piston 8 are bidirectional with the air passage 19 having the check valve 20. It flows into the return air chamber 22 via the passage 33.

  Next, when the trigger 27 is released, that is, returned, or the plunger 29a is returned by stopping the pushing operation of the push lever 31 to the wood 50, the head valve 10 on the upper end side of the cylinder 7 is The air passage between the upper chamber 17 of the piston 8 and the pressure accumulating chamber 6 is closed, and conversely, the upper chamber 17 of the piston 8 opens the valve portion (outermost peripheral portion) 11g of the exhaust valve rubber 11, so that the exhaust hole 15 It communicates with the atmosphere through. On the other hand, the lower side of the piston 8 of the cylinder 7 is pressed upward by the compressed air accumulated in the return air chamber 22, and the piston 8 suddenly moves to the top dead center in the cylinder 7. The air in the upper chamber 17 of the piston 8 of the cylinder 7 is released to the atmosphere through the exhaust passage 16 and returns to the initial state.

  By repeating the above steps, the nail 32 is sequentially driven into the wood (workpiece) 50. The replenishment of the nail 32 is performed from the loading port 4a in which a nail row connected in close contact with each other in parallel is opened at the end face of the magazine 4.

  As will be apparent from the above description, according to the present invention, the exhaust cover is formed with a guide hole, and the exhaust valve rubber is substantially equal to or less than the guide hole provided in the exhaust cover. A columnar guide diameter portion having a dimension and a columnar latching diameter portion having a diameter larger than that of the guide hole portion are provided, and the columnar latching diameter portion of the exhaust valve rubber is guided while being made smaller than the exhaust cover guide hole portion. By inserting the exhaust valve rubber into the hole portion, the exhaust valve rubber is hooked to the exhaust cover, so that the mounting structure of the exhaust valve rubber and the exhaust cover can be simplified. As a result, the exhaust cover and the exhaust valve rubber can be easily processed. In addition, since the upper end surface of the exhaust valve rubber located on the opposite side of the abutting surface of the exhaust valve rubber with which the piston contacts at the top dead center is separated from the lower surface of the guide hole portion of the exhaust cover, a gap is provided. The impact load that contacts or strikes the exhaust valve rubber when returning to the dead center can be reduced initially.

  Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. It is.

A sectional view showing one embodiment of a nailing machine concerning the present invention. The principal part sectional view showing one embodiment of a nail driver concerning the present invention. The principal part sectional drawing which shows the fitting state of the exhaust valve rubber and the exhaust cover in the nailing machine which concerns on this invention. Sectional drawing of the principal part which shows the fitting state of the exhaust valve rubber and the exhaust cover in the conventional nailing machine.

Explanation of symbols

1: Nailing machine 2: Nailing machine body 3: Handle part 4: Magazine 4a: Loading port 5: Housing (frame) 5a: Exhaust cover 5b: Head cover 5c: Exhaust cover mounting part 5d: Guide hole part 5e: The lower surface 5f of the flat plate portion of the exhaust cover: The upper surface of the flat plate portion of the exhaust cover 5g: the cylindrical concave portion 5h: the head valve partitioning portion 5j: the latching portion (convex portion) 5k: the concave portion 6: the pressure accumulation chamber 7: the cylinder 8: the piston 8a : O-ring of piston 8b: Upper peripheral surface 8c of piston: Upper central surface of piston 9: Driver blade 9a: Driver blade tip 10: Head valve (main valve)
10a: O-ring of the head valve 10b: O-ring of the head valve
10c: Head valve lower end portion 11: Exhaust valve rubber 11a: Exhaust valve rubber fixing portion 11b: Column-shaped retaining diameter portion 11c: Columnar guide diameter portion 11d: Central upper end surface 11e: Periphery upper end surface 11f: Abutting surface (lower end surface) 11g: Valve part (outermost part)
11h: Engagement diameter end face (upper end face) 11j: Cylindrical wall 12: Head valve spring 13: Head valve control passage 14: Head valve upper chamber 15: Exhaust hole (air passage)
15a, 15b: exhaust chamber 16: exhaust passage 17: piston upper chamber 18: head valve rubber 19: air passage 20: check valve 21: piston bumper 22: return air chamber 27: trigger 28: arm plate 29: trigger valve portion 29a: Plunger 30: Nose injection part 30a: Nose injection port 31: Push lever 32: Nail 33: Piston bumper 34: Clearance 41, 42: Fastening tool (bolt / nut) 50: Work piece (wood)

Claims (4)

A housing that defines a pressure accumulating chamber for storing compressed air;
A cylindrical cylinder provided in the housing;
A piston provided in the cylinder so as to be reciprocally slidable;
A driver blade fixed integrally or separately to the lower surface of the piston, extending from the lower surface of the piston to the outside lower part of the cylinder at the bottom dead center of the piston, and striking a nail by the reciprocating motion of the piston;
An air passage from the piston upper chamber to the pressure accumulating chamber or the air passage to the atmosphere, which is provided so as to be vertically movable with respect to the upper peripheral edge of the cylinder and is partitioned by a wall portion including the upper surface of the piston, is alternatively selected. A head valve to be formed;
An elastic material provided at an upper portion of the cylinder, and forms an air passage from the piston upper chamber to the atmosphere in cooperation with the head valve by contacting or non-contacting with the vertical movement of the head valve. An exhaust valve rubber consisting of
An exhaust cover that is integrally formed with the housing at an upper portion of the cylinder, and that includes a head valve compartment for housing the head valve, a mounting portion for mounting the fixing portion of the exhaust valve rubber, and an exhaust hole communicating with the atmosphere; In a nailing machine having
The mounting portion of the exhaust cover has a guide hole portion having a first diameter penetrating from the lower surface of the flat plate portion of the exhaust cover to the upper surface, and the fixing portion of the exhaust valve rubber has the first diameter. A columnar guide diameter portion having a second diameter substantially equal to or smaller than the columnar guide diameter portion, and a columnar latching diameter portion having a third diameter larger than the guide diameter portion continuous to the columnar guide diameter portion. Prepared,
By inserting the column-shaped retaining diameter portion of the exhaust valve rubber into the guide hole portion while being smaller than the exhaust cover guide hole portion, and positioning the guide diameter portion of the exhaust valve rubber within the guide hole portion. A nailing machine characterized in that the exhaust valve rubber is hooked on the exhaust cover.   The exhaust hole of the exhaust cover is disposed on a central axis of the piston, and the exhaust valve is disposed at a portion corresponding to a contact surface between the piston at the top dead center of the piston and the exhaust valve rubber. 2. A nailer according to claim 1, wherein the nailer is spaced from the rubber.   The guide hole portion of the exhaust cover is configured by a concave portion disposed on the central axis of the piston, and the guide hole portion is formed at a flat plate bottom portion of the concave portion, and the columnar latch of the exhaust valve rubber is formed. The nailing machine according to claim 1 or 2, wherein the diameter portion is accommodated in the recess. The exhaust valve rubber has a cylindrical wall portion integrally formed with the guide diameter portion and the hooking diameter portion so as to surround the columnar guide diameter portion and the hooking diameter portion. The nailing machine according to claim 3, wherein the wall portion is disposed so as to surround an outer peripheral surface of the concave portion of the exhaust cover.

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