JP2008073812A - Driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driver which achieves cost reduction by eliminating a step of correcting an upper lever of a push lever, and solves problems such as breakage of the upper lever due to stress concentration at the same, and deterioration of life due to degraded material strength. <P>SOLUTION: The pneumatic nail driver (driver) 1 is formed of: a piston 10 provided with a driver blade 11 for driving a nail (fastener) by reciprocative motion driven by a driving source; a trigger 6 having a trigger arm 25 rotatably connected thereto; and the push lever 22 obtained by connecting the upper lever 22A and a lower lever 22B together via an adjuster 27, and the driver functions to drive the nail to a driving target material by driving the piston 10, based on cooperation between drawing operation of the trigger 6 and pressing operation of the push lever 22 to the driving target material. Herein the upper lever 22A of the push lever 22 is formed by coupling two divided press-molded products together. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a driving machine for driving a stopper such as a nail or a staple by a driver blade that reciprocates with a piston.

  A nailing machine as one form of a driving machine is divided into two parts, a piston having a driver blade that reciprocates by a driving source and hits a nail, a trigger that rotatably connects a trigger arm. It has a push lever formed by connecting an upper lever and a lower lever with an adjuster, and the piston is driven by the cooperation of the pulling operation of the trigger and the pushing operation of the push lever against the driven material. It is a tool for driving nails into a workpiece.

  By the way, in such a nailing machine, in consideration of safety, the nailing operation is not started only by the trigger pulling operation, and both the trigger pulling operation and the pushing operation of the push lever against the driven material are performed. Only when the operation is performed, the piston is driven to start the nailing operation. Specifically, when the push lever is pressed against the material to be driven, the push lever moves in the piston axial direction, the upper lever of the push lever engages with the trigger arm, and the trigger arm is moved against the trigger. The driving source is configured to be rotated and to be activated by a pulling operation of a trigger (see, for example, Patent Document 1).

By the way, as shown in FIG. 6, the upper lever 122A of the push lever is configured such that a prismatic rod portion 122b is erected vertically at the center of the disc-shaped base portion 122a. The upper lever 122A was integrally formed by precision casting or metal injection.
JP 2005-335035 A

  However, when the upper lever 122A shown in FIG. 6 is integrally formed by precision casting or the like as in the prior art, the rod portion 122b inevitably bends in manufacturing, and therefore a correction process for correcting the bend is performed later. There was a problem that it was necessary as a process, and the manufacturing process increased and the cost was not avoided.

  In addition, in order to correct the bending of the rod portion 122b in the correction process of the upper lever 122A, stress concentration occurs at the base portion of the rod portion 122b (portion a in FIG. 6), and that portion is easily damaged. Since blow holes are generated at the time of molding, there is a problem that the material strength is lowered and the life of the molded upper lever 122A is reduced.

  The present invention has been made in view of the above-mentioned problems, and the intended process is to reduce the cost by eliminating the correction process of the upper lever of the push lever, and also to breakage due to stress concentration of the upper lever and decrease in material strength. An object of the present invention is to provide a driving machine capable of solving problems such as a decrease in service life.

  In order to achieve the above object, a first aspect of the present invention includes a piston having a driver blade that reciprocates by a driving source to hit a stopper, a trigger that is formed by rotatably connecting a trigger arm, and 2 The piston is driven by the cooperation of the push lever formed by connecting the divided upper lever and lower lever with an adjuster, and the pulling operation of the trigger and the pressing operation of the push lever against the workpiece. In the driving machine for driving the stopper into the material to be driven, the upper lever of the push lever is formed by joining the press-molded product divided into two parts.

  The invention according to claim 2 is the invention according to claim 1, wherein the upper lever is configured by joining a disk-shaped base member and a prismatic rod member, which are the press-molded product, by brazing. Features.

  According to the present invention, since the upper lever of the push lever is manufactured by joining two press-formed products, the correction process as a post process that has been conventionally required can be omitted, and the manufacturing cost can be reduced.

  In addition, there are no problems such as damage to the upper lever due to stress concentration that occurred in the straightening process of the integrally molded upper lever, and a decrease in life due to a decrease in material strength due to blow holes generated during molding. The durability of the upper lever can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a left side view showing a part of a pneumatic nailing machine as a form of a driving machine according to the present invention, FIG. 2 is a right side view of the pneumatic nailing machine, and FIG. FIG. 4 is a perspective view of the upper lever, and FIG. 5 is an exploded perspective view of the upper lever.

  A pneumatic nailing machine 1 shown in FIGS. 1 and 2 includes a housing 2 having a substantially T shape in a side view, and an exhaust cover 3 is airtightly attached to an upper end opening of the housing 2. . A pressure accumulation chamber S1 is formed in the housing 2, and an air plug 4 for connecting an air hose (not shown) is provided at the rear end of the handle portion 2a of the housing 2.

  Furthermore, the housing 2 is provided with a trigger valve 8 including a plunger 7 that can move a number of nails (not shown) and that can move up and down by a trigger 6.

  A cylinder 9 is provided in the housing 2, and a piston 10 is fitted into the cylinder 9 so as to be slidable up and down. One end of a plate-like driver blade 11 is connected to the piston 10 by a piston pin 12, and the driver blade 11 extends vertically downward in the cylinder 9. The cylinder 9 is partitioned into a piston upper chamber S2 and a piston lower chamber S3 by a piston 10, and a piston bumper 13 made of an elastic body such as rubber is provided at the bottom of the cylinder 9.

  Furthermore, a cylindrical return air chamber S4 defined by a partition wall 14 is formed in the lower half of the housing 2 between the cylinder 9 and constitutes a part of the return air chamber S4 of the cylinder 9. A plurality of air holes 15 and 16 are formed in the circumferential direction above and below the portion, and only the flow of compressed air from the piston upper chamber S2 toward the return air chamber S4 is allowed in the upper air hole 15. A check valve 17 is provided.

  On the other hand, a main valve 18 that comes in contact with and separates from the upper surface of the cylinder 9 is provided in the exhaust cover 3 so as to be vertically slidable. The direction is in close contact with the upper end surface). A main valve chamber S5 is defined between the main valve 18 and the exhaust cover 3, and the main valve chamber S5 communicates with the trigger valve 8 via an air passage (not shown). As will be described later, the pressure accumulation chamber S1 or the atmosphere is selectively communicated by the trigger valve 8. The exhaust cover 3 is formed with an exhaust hole 20 that opens into the atmosphere. The exhaust hole 20 is opened and closed by a main valve 18 and selectively communicated with the cylinder upper chamber S2.

  Further, a nose 21 for guiding a nail is attached to the front end portion of the housing 2, and a push lever 22 that is movable in the vertical direction along the nose 21 is provided. An injection port 23 for driving the nails supplied from 5 one by one is formed.

  As shown in detail in FIG. 3, one end of the trigger 6 is pivotally attached to the trigger 6 by a trigger pin 24, and one end of a trigger arm 25 is vertically attached to the trigger 6 by a roll pin 26. The other end (free end) of the trigger arm 25 is engaged with the upper portion of the trigger pin 24.

  The push lever 22 is configured by connecting an upper lever 22A divided into two and a plate-like lower lever 22B by an adjuster 27.

  Thus, in the present embodiment, as shown in FIG. 5, the upper lever 22A brazes the disc-shaped base member 22a and the prismatic rod member 22b separately manufactured by press molding of steel. As shown in FIG. 4, they are integrally formed as one component by being joined by (in this embodiment, copper brazing). That is, the lower end portion of the rod member 22b that is also press-molded is fitted from above into a rectangular hole 22a-1 formed in the center of the base member 22a by press molding, and the fitting portion is brazed as shown in FIG. The upper lever 22A as one component shown in FIG.

  As shown in detail in FIG. 3, the rod member 22b of the upper lever 22A configured as described above is inserted and supported so as to be vertically movable at the center of a cylindrical lever guide 28 that opens downward.

The adjuster 27 is for adjusting the depth of the nail by adjusting the length of the push lever 22, and has a bottom with which the lever guide 28 can be vertically moved and rotated from below. A cylindrical dial 29 and a screw member 30 that rotates together with the dial 29 are included. Here, the base member 22a of the upper lever 22A is fitted and held in the dial 29, and the entire push lever 22 including the upper lever 22A is located between the lever guide 28 and the base member 22a of the upper lever 22A. It is urged downward by a spring 31 that has been compressed.

  On the other hand, as shown in FIG. 2, the lower lever 22B of the push lever 22 is formed by bending a metal plate. When the pneumatic driving machine 1 is not operated, the lower end portion of the lower lever 22B is A predetermined amount protrudes downward from the lower end of the nose 21. When the pneumatic driving machine 1 is not operated, the upper lever 22A of the push lever 22 is urged downward by the spring 31 as shown by the solid line in FIG. In this state, even if the trigger 6 is pulled and rotated upward about the trigger pin 24, the trigger arm 25 does not contact the plunger 7 of the trigger valve 8, It is not possible to start the pneumatic driving machine 1 by driving the trigger valve 8.

  Next, the operation of the pneumatic nailer 1 having the above configuration will be described.

  When an air hose (not shown) is connected to the air plug 4 during a nailing operation on a workpiece (not shown) such as wood, compressed air is supplied from a pressure supply source (not shown) such as a compressor through the air hose. It is supplied to and accumulated in the pressure accumulating chamber S1 in the housing 2, and a part thereof flows into the main valve chamber S5 through an air passage (not shown).

  The compressed air flowing into the main valve chamber S5 causes the main valve 18 to come into close contact with the upper end surface of the cylinder 9 together with the spring 19 as shown in FIG. In order to cut off the communication and prevent the compressed air in the pressure accumulating chamber S1 from flowing into the piston upper chamber S2, the piston 10 remains stationary and no nailing operation is performed.

  Next, when both the pulling operation of the trigger 6 and the pushing operation of the push lever 22 against the driven material are performed, the push lever 22 moves upward, and the upper end of the upper lever 22A is shown by a chain line in FIG. As shown in the figure, the trigger arm 25 is rotated upward to the chain line position around the roll pin 26, so the distance between the trigger arm 25 and the plunger 7 of the trigger valve 8 is shortened. Therefore, when the trigger 6 is pulled in this state and rotated upward about the trigger pin 24, the trigger arm 25 rotates upward about the tip of the rod member 22b of the upper lever 22A to rotate the trigger valve 8. In order to push the plunger 7 upward, the trigger valve 8 is turned ON, and the compressed air in the main valve chamber S5 is discharged into the atmosphere through an air passage (not shown).

  Then, the main valve 18 is pushed up by the pressure of the compressed air in the pressure accumulating chamber S1, the upper end of the cylinder 9 is opened, and at the same time, the communication between the piston upper chamber S2 in the cylinder 9 and the atmosphere is cut off, and the pressure in the pressure accumulating chamber S1 is increased. Compressed air flows into the piston upper chamber S2 in the cylinder 9, and the piston 10 together with the driver blade 11 suddenly descends toward the bottom dead center due to the pressure of the compressed air. Therefore, from the magazine 5 to the injection port 23 of the nose 21. The supplied nail is hit by the driver blade 11. Then, the nail hit by the driver blade 11 is guided to the injection port 23 of the nose 21 and driven into the material to be driven. When the dial 29 of the adjuster 27 is turned, the screw member 30 is rotated with this and the lower lever 22B of the push lever 22 is moved up and down, so that the entire length of the push lever 22 is adjusted and the nail driving depth is adjusted. Is arbitrarily adjusted.

  When the piston 10 descends in the cylinder 9 and passes through the air hole 15, the compressed air in the piston upper chamber S2 flows into the return air chamber S4 through the air hole 15 and the check valve 17 and is accumulated. The Further, when the piston 10 descends in the cylinder 9 and reaches the bottom dead center, the piston 10 collides with the piston bumper 13 and elastically deforms the piston bumper 13. Therefore, surplus energy is generated by the elastic deformation of the piston bumper 13. Is absorbed.

  Next, when the trigger 6 is returned to the original position or the push lever 22 is separated from the driven material, the plunger 7 returns to the original position, the trigger valve 8 is turned OFF, and the compressed air in the pressure accumulating chamber S1 is not shown. Since the air flows into the main valve chamber S5 through the air passage, the main valve 18 is moved downward by the pressure of the compressed air and is detached from the exhaust cover 3. As shown in FIG. It adheres to the upper end surface of. Then, the communication between the pressure accumulating chamber S1 and the piston upper chamber S2 in the cylinder 9 is cut off, and the exhaust hole 20 is opened to allow the piston upper chamber S2 to communicate with the atmosphere via the exhaust hole 20. Thereby, the compressed air in the piston upper chamber S2 in the cylinder 9 is discharged from the exhaust hole 20 to the atmosphere.

  Then, since the compressed air accumulated in the return air chamber S4 flows into the piston lower chamber S3 in the cylinder 9 through the air hole 16, the piston 10 receives the pressure of the compressed air on the lower surface and moves inside the cylinder 9. The piston 10 and the driver blade 11 return to the initial positions shown in FIG.

  By repeating the above operation, the plurality of nails loaded in the magazine 5 are continuously driven into the driven material.

  As described above, in the present embodiment, the upper lever 22A of the push lever 22 is manufactured by joining the base member 22a and the rod member 22b, which are two press-formed products, by brazing. The correction process as a process can be omitted and the manufacturing cost can be reduced.

  In addition, the life of the upper lever 122A (see FIG. 6) integrally molded is reduced due to the stress concentration generated during the correction process, and the material strength is reduced due to the blowhole generated during molding. Thus, the durability of the upper lever 22A of the push lever 22 can be improved.

  Although the present invention has been described with respect to the embodiment in which the present invention is applied to a pneumatic nailing machine, the present invention can be applied to electric and combustion nailing machines in the same manner. Of course, the present invention can be similarly applied to any other driving machine for driving a stopper such as a pin or a staple.

It is a left view which fractures | ruptures and shows a part of pneumatic type nailing machine which concerns on this invention. It is a right view of the pneumatic nailer according to the present invention. It is the A section enlarged detail drawing of FIG. It is a perspective view of the upper lever of the pneumatic driving machine concerning the present invention. It is a disassembled perspective view of the upper lever of the pneumatic driving machine which concerns on this invention. It is a perspective view of the upper lever of the conventional pneumatic driving machine.

Explanation of symbols

1 Pneumatic nailer (driving machine)
2 Housing 2a Handle 3 Exhaust cover 4 Air plug 5 Magazine 6 Trigger 7 Plunger 8 Trigger valve 9 Cylinder 10 Piston 11 Driver blade 12 Piston pin 13 Piston bumper 14 Bulkhead 15, 16 Air hole 17 Check valve 18 Main valve 19 Spring 20 Exhaust Hole 21 Nose 22 Push lever 22A Push lever upper lever 22B Push lever lower lever 22a Upper lever base member 22a-1 Base member rectangular hole 22b Upper lever rod member 23 Injection port 24 Trigger pin 25 Trigger arm 26 Roll pin 27 Adjuster 28 Lever guide 29 Dial 30 Screw member 31 Spring S1 Accumulation chamber S2 Piston upper chamber S3 Piston lower chamber S4 Return air chamber S5 Mei Valve chamber

Claims (2)

An adjuster is used to connect a piston with a driver blade that reciprocates by a drive source to strike a stop, a trigger that is connected to a trigger arm in a pivotable manner, and an upper lever and a lower lever that are divided in two. In a driving machine for driving the piston into the driven material by driving the piston by the cooperation of the push lever formed, the pulling operation of the trigger and the pressing operation of the push lever to the driven material,
A driving machine characterized in that the upper lever of the push lever is constituted by combining two press-molded products. 2. The driving machine according to claim 1, wherein the upper lever is configured by joining a disk-shaped base member and a prismatic rod member, which are the press-formed product, by brazing.

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