JP2013166198A - Driving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving machine in which a reaction of driving directly transmitted from a housing to a handle can be reduced upon driving a nail.SOLUTION: A driving machine includes a frame 10, and a handle 100 extending in a direction orthogonal to a longitudinal direction of the frame 10. The handle 100 is attached to the frame 10 so as to be rotatable around a pin 101 with respect to a handle attaching part 10A of the frame 10. The pin 101 extends vertically to a plane including the axial center of a cylinder and the axial center of the handle in the frame 10. By a reaction force of driving applied to the frame 10 generated by driving a nail, the frame 10 turns around the pin 101, and thus vibration directly exerted on the handle 100 is reduced.

Description

  The present invention relates to a driving machine driven by compressed air.

  2. Description of the Related Art A driving machine that uses compressed air as a power source to drive a fastener such as a nail into an object by a striking member is well known and widely used in construction sites and the like. The driving machine has a cylinder in which a piston for driving a nail into a housing having a handle for gripping can be arranged slidably up and down, a connecting nail is sequentially fed into an injection port, and a nail for driving with a screwdriver at the tip of the piston A configuration having a fastener feeding portion and a magazine for storing a connecting nail is common.

  In order to absorb the reaction of the main body when a nail or the like is driven using a general driving machine having the above-described configuration, a driving machine provided with an elastic member on the surface of the grip part of the handle is known. ing.

JP 2009-66709 A

  However, since the anti-vibration member is provided at the grip part of the handle that is gripped by the hand of the operator and the location where it is connected to the housing, an excessively soft material cannot be used from the viewpoint of workability. The conventional driving machine has room for improvement in terms of reducing the reaction transmitted to the hand.

  In view of such circumstances, an object of the present invention is to provide a driving machine that can effectively reduce the reaction of driving applied to the handle when driving a nail.

  The driving machine of the present invention includes a housing, a pressure accumulating chamber that is provided in the housing and stores compressed air, a cylinder that is provided in the housing and supported by the housing, and a direction that intersects the axial direction of the cylinder. A handle portion attached to a handle attachment portion of the housing extending to the piston, a piston upper chamber provided so as to be capable of reciprocating in the cylinder, and a space in the cylinder located near one end of the cylinder; A piston that is partitioned into a piston lower chamber positioned closer to the end, and by supplying compressed air from the pressure accumulating chamber to the piston upper chamber, the piston moves from the piston upper chamber to the piston lower chamber. A driving machine for generating a striking force in the axial direction of the cylinder, wherein the handle portion has one end portion Is attached to the handle attachment portion so as to be rotatable about a shaft member extending in a direction perpendicular to a plane including the axis of the handle attachment portion and the axis of the handle attachment portion. It is characterized by.

  With the above-described configuration, the housing is rotated in the direction opposite to the driving direction of the fastener around the shaft member due to the reaction of the driving acting on the cylinder or the housing when driving the fastener such as a nail. Is attenuated. Therefore, it is possible to reduce the vibration that directly acts on the handle portion from the housing.

  Preferably, the apparatus further includes a magazine for holding a fastener driven by movement of the piston, and the magazine is a part of the housing and is an end portion in a direction from the piston upper chamber toward the piston lower chamber. And the other end portion of the handle portion are attached to the housing and the handle portion. With the above configuration, the magazine is pulled between the end of the housing and the other end of the handle when a fastener such as a nail is driven. For this reason, it is possible to absorb the reaction of driving by the magazine.

  Preferably, the magazine is made of an elastic material. With this configuration, when the magazine is pulled between the end of the housing and the other end of the handle grip when driving a fastener such as a nail, the magazine elastically stretches to absorb the reaction of driving. be able to.

  Preferably, the magazine and the other end portion of the handle portion are connected via a second elastic member. With this configuration, coupled with the fact that the magazine absorbs the recoil of driving when the fastener is driven, the recoil can be effectively absorbed by the second elastic member.

  ADVANTAGE OF THE INVENTION According to this invention, the driving device which can reduce effectively the reaction of driving | running | working which acts on a housing at the time of driving | running | working fasteners, such as a nail, can be provided.

The side fragmentary sectional view which shows the state before driving a nail with the driving machine by embodiment of this invention. The side fragmentary sectional view which shows the state after hitting a nail with the driving machine by embodiment of this invention. The side fragmentary sectional view explaining the state of the force which acts on the driving machine after hitting a nail. Sectional drawing along IV-IV of FIG. Sectional drawing in alignment with VV of FIG.

  An embodiment of a driving machine according to the present invention will be described with reference to FIGS. In the following description, the top and bottom in FIG. 1 are defined as the top and bottom of the driving machine 1 for convenience. Further, the direction from the right side to the left side in FIG. 1 is defined as the front, and the opposite direction is defined as the rear. Further, the direction from the back side to the front side in FIG. 1 is defined as the left direction, and the opposite direction is defined as the right direction.

  As shown in FIG. 1, the driving machine 1 is a driving machine that is driven by compressed air and drives a nail. The driving machine 1 is made of an aluminum alloy as a housing, and has a cylindrical frame 10. The handle portion 100 is supported and held by an operator.

  As shown in FIG. 1, a cylindrical cylinder 11 is provided in the frame 10, and a piston 12 </ b> A is provided in the cylinder 11 so as to be able to reciprocate up and down. A driver blade 12B is formed integrally with the piston 12A, and a nail as a fastener (not shown) can be driven by a tip portion 12C of the driver blade 12B. A check valve 12D is provided at a substantially central portion in the axial direction of the cylinder 11, and a return air chamber for storing compressed air for returning the driver blade 12B to the top dead center is provided outside the lower portion of the cylinder 11. 10 b is defined by a space surrounded by the outer peripheral surface of the cylinder 11 and the inner peripheral surface of the frame 10. The compressed air is configured to flow only in one direction from the cylinder 11 to the return air chamber 10b by the check valve 12D. In addition, an air passage 11a is formed in the lower portion of the cylinder 11 so as to always communicate the inside of the cylinder 11 and the return air chamber 10b. Also, a piston bumper 11A for absorbing surplus energy of the driver blade 12B after driving a nail as a fastener is provided at the lower end of the cylinder 11.

  The frame 10 has a cylindrical handle attachment portion 10 </ b> A that is attached to the handle portion 100 and extends in a direction orthogonal to the axial direction of the cylinder 11. The handle attachment portion 10A has an elliptical cross section, for example.

  The handle part 100 has a cylindrical shape with a conical head shape that gradually increases in diameter from one end part attached to the handle attaching part 10A toward the other end part. As shown in FIG. 1, one end of the handle portion 100 is attached to the frame 10 so as to be pivotable about a pin 101 as a shaft member. That is, the handle part 100 is provided so that it can be displaced relative to the frame by being displaced about the pin 101. Further, as shown in FIG. 4, the pin 101 has a handle attachment portion extending in a direction perpendicular to a plane including the axial direction of the cylinder and the axial direction of the handle attachment portion 10A. 10A and the handle | steering-wheel part 100 are attached so that it may penetrate the cylindrical cross section. With this configuration, the handle attachment portion 10A and the handle portion 100 can be rotated relatively around the pin 101. As can be seen from FIG. 1, the range in which the handle portion 100 can rotate is the range until the handle portion 100 and the handle mounting portion 10 </ b> A abut against each other with a seal member 103 described later interposed therebetween. Here, since the pin 101 extends in a direction perpendicular to the axial direction of the cylinder, the direction in which the handle mounting portion 10A and the handle portion 100 can rotate is determined by the handle during the driving operation by the driving machine 1 described later. The frame 10 and the handle with respect to the portion 100 substantially coincide with the direction in which the mounting portion 10A is about to rotate. Of course, the direction in which the pin 101 extends need not be strictly perpendicular to the axial direction of the cylinder. Further, when the handle portion 100 tries to rotate with respect to the handle attachment portion 10 </ b> A about the direction intersecting the pin 101, the pin 101 is not rotated because it is engaged with the handle portion 100. Thereby, in the driving operation, when the aim of the driving machine 1 is determined, since the handle mounting portion 10A and the handle portion 100 do not rotate in the left-right direction, the target can be stably set. Thus, the recoil can be reduced. Furthermore, the O-ring mounting groove is provided in the handle mounting portion 10A, and O-rings 102 and 102 are fitted on both ends of the cylindrical surface of the pin 101 facing the handle mounting portion 10A, respectively.

  Further, a cylindrical seal member 103 formed of an elastic body such as rubber is disposed between one end of the handle portion 100 and the handle attachment portion 10A. The seal member 103 is biased from both the handle portion 100 and the handle attachment portion 10A, and maintains the airtightness inside the handle portion 100. Further, since the seal member 103 is formed of an elastic body, a part of the reaction is absorbed by the seal member 103 during a driving operation by the driving machine 1 described later.

  Therefore, when the handle portion 100 is attached to the frame 10, the animal pressure chamber 10 a is formed in the handle portion 100 and in the frame 10. Since the stock pressure chamber 10a is kept airtight by the O-rings 102 and 102 and the seal member 103, compressed air can be supplied into the pressure accumulating chamber 10a through an air hose (not shown).

  The outer peripheral surface of the handle part 100 is covered with an elastomer 104.

  Further, the other end portion of the handle 100 is provided with a magazine connecting portion 100A that extends on the flat plate and extends downward. The normal direction of the front and back surfaces of the magazine connecting portion 100A is directed in the left-right direction. Further, as shown in FIG. 1, the magazine connecting portion 10D is formed with a through hole 100Aa penetrating the magazine connecting portion 100A in the left-right direction.

  An operation unit 20 is provided in the vicinity of the handle mounting portion 10 </ b> A of the frame 10. The operation unit 20 includes a trigger 21 that is operated by the operator's finger, an arm plate 22 that is rotatably attached to the trigger 21, a protrusion that protrudes from the lower end of the frame 10 to the vicinity of the arm plate 22, and extends along the lower end of the frame 10. And a movable push lever 23. Further, a trigger valve portion 30 to be described later is provided at a position facing the trigger 21 at the base portion of the handle shaft portion 10A.

  When both the pulling operation of the trigger 21 by the operator's finger and the pressing operation of the push lever 23 against the workpiece are performed at the same time, the link mechanism constituted by the arm plate 22 and the trigger 21 will be described later. The plunger 32 of the trigger valve section 30 is configured to be pushed up.

  An injection part 13 for injecting a fastener (not shown) is provided at the lower end of the frame 10. The injection unit 13 is made of a resin that is an elastic material and is filled with a magazine 41 that is not shown, and a feeding mechanism that sequentially feeds the nail that is a fastener loaded in the magazine 41 to the injection port 13a. 42 is connected. That is, the magazine 41 has a front end connected to the injection port 13 via the feeding mechanism 42 and a rear end connected to the other end of the handle grip portion 10B. Thus, the injection portion 13 which is an end portion in the direction from the piston upper chamber to the piston lower chamber and the other end portion of the handle grip portion 10B are provided so as to span.

  On the upper part of the rear end portion of the magazine 41, a handle portion connection portion 41A that is flat and extends upward is provided. The normal direction of the front and back surfaces of the handle portion connection portion 41A is directed in the left-right direction. Further, as shown in FIG. 4, the handle portion connecting portion 41A is formed with a through hole 41Aa penetrating the handle portion connecting portion 41A in the left-right direction. The through hole 41Aa and the through hole 10Da are arranged in a coaxial positional relationship and have the same diameter. An annular rubber 41AG is provided on the entire inner peripheral surface of the through-hole 41Aa and the entire inner peripheral surface of the through-hole 10Da so as to go around the inner peripheral surface. In the space defined by the inner peripheral surface of the annular rubber 41AG, the cylindrical member 41AA is disposed coaxially with the annular rubber 41AG, and the outer peripheral surface of the cylindrical member 41AA and the inner peripheral surface of the annular rubber 41AG are in contact with each other. ing. The bolt 41AB penetrates the space defined by the inner peripheral surface of the cylindrical member 41AA. A washer 41AC is provided at the head and tip of the bolt 41AB, and a nut 41AD is screwed to the tip of the bolt 41AB. The annular rubber 41AG corresponds to the second elastic member.

  As shown in FIG. 1, the trigger valve section 30 includes an outer valve bush 30 </ b> A and an inner valve bush 30 </ b> B, a valve piston 31, and a plunger 32. The outer valve bush 30 </ b> A and the inner valve bush 30 </ b> B are fixed to the frame 10 as a trigger valve outer frame portion that forms an outline of the trigger valve.

  The valve piston 31 is provided so as to be positioned in the outer valve bush 30A and the inner valve bush 30B, and can reciprocate relative to the outer valve bush 30A and the inner valve bush 30B. Although the valve piston 31 does not appear in the drawing, the upper end portion in the sliding direction faces the pressure accumulating chamber 10a. A trigger valve chamber 30a is defined below the valve piston 31 by the lower end portion of the valve piston 31 and the outer valve bush 30A.

  The plunger 32 is disposed in a through hole formed at the axial center position of the valve piston 31 and can reciprocate with respect to the valve piston 31 that defines the through hole. The lower end portion of the plunger 32 passes through the trigger valve chamber 30a, and can pass through a through hole formed in the valve bush 30A so as to contact the arm plate 22.

  A spring (not shown) is provided between the valve piston 31 and the plunger 32 to urge the valve piston 31 upward and urge the plunger 32 downward.

  An air passage 30Aa that communicates from the pressure accumulation chamber 10a to the trigger valve chamber 30a is formed between the plunger 32 and the outer valve bush 30A. In addition, a trigger valve control passage communicating from the trigger valve chamber 30a to the atmosphere is formed between the plunger 32 and the valve piston 31. The air passage and the trigger valve control passage are selectively communicated / blocked by sliding of the plunger 32.

  The trigger valve section 30 is connected to a sleeve valve control passage (not shown) extending from a sleeve valve chamber 10e described later. Specifically, a sleeve valve inlet passage that communicates from the sleeve valve control passage to the pressure accumulating chamber 10a is formed between the valve piston 31 and the inner valve bush 30B and below the opening of the sleeve valve control passage. Has been. Further, a second air passage communicating with the atmosphere from the sleeve valve control passage is formed between the valve piston 31 and the inner valve bush 30B and above the opening of the sleeve valve control passage. The sleeve valve control passage can communicate with the sleeve valve inlet passage and the second air passage, which form a space between the valve piston 31 and the inner valve bush 30B. The sleeve valve inlet passage and the second air passage are configured to be selectively communicated / blocked by sliding the valve piston 31 up and down.

  When the valve piston 31 is located on the top dead center side, the sleeve valve intake passage is opened to connect the pressure accumulating chamber 10a and the sleeve valve control passage, and the second air passage is closed to close the sleeve valve control passage. And the atmosphere are shut off. Further, when the valve piston 31 is located on the bottom dead center side, the sleeve valve intake passage is closed, the sleeve valve control passage and the pressure accumulating chamber 10a are shut off, and the second air passage is opened, The sleeve valve control passage communicates with the atmosphere.

  When the plunger 32 is located on the bottom dead center side, the trigger valve control passage is closed and the trigger valve chamber 30a and the atmosphere are shut off, and the air passage is opened and the pressure accumulation chamber 10a and the trigger valve chamber 30a are opened. Communicate. Further, when the plunger 32 is located on the top dead center side, the trigger valve control passage is opened and the trigger valve chamber 30a communicates with the atmosphere, and the air passage is closed and the pressure accumulation chamber 10a and the trigger valve chamber 30a are closed. And are cut off.

  A sleeve valve portion 50 is provided above the upper end of the cylinder 11. The sleeve valve portion 50 includes a sleeve valve 51 and a sleeve valve spring 53 that is disposed in the sleeve valve chamber and biases the sleeve valve 51 toward the top dead center. An air passage (not shown) communicates with the atmosphere through an exhaust hole (not shown) provided in the upper part of the frame 10.

  The sleeve valve chamber communicates with the sleeve valve control passage. O-rings 51A and 51B are respectively provided at the lower end portion of the sleeve valve and a part of the frame 10 that defines the lower portion of the sleeve valve chamber, and the sleeve valves are provided by the O-rings 51A and 51B. The chamber 10e is kept airtight.

  When the sleeve valve 51 is located on the bottom dead center side, an air passage (not shown) is closed, the piston upper chamber 11b of the piston 12A is shut off from the atmosphere, and the piston upper chamber 11b and the pressure accumulating chamber 10a communicate with each other. . Further, when the sleeve valve 51 is located on the top dead center side, the piston upper chamber 11b and the pressure accumulating chamber 10a of the piston 12A are shut off, and an air passage (not shown) is opened to connect the piston upper chamber 11b to the atmosphere. To communicate with.

  Next, a driving operation by the driving machine 1 will be described. First, an air hose (not shown) is connected to the driving machine 1 to accumulate compressed air in the pressure accumulating chamber 10a. The plunger 32 is located at the bottom dead center by the biasing force of the spring. When the plunger 32 is located at the bottom dead center, the air passage is opened, and the pressure accumulating chamber 10a and the trigger valve chamber 30a communicate with each other. At the same time, since the trigger valve control passage is closed, the communication between the trigger valve chamber 30a and the atmosphere is blocked, and a part of the compressed air in the pressure accumulating chamber 10a flows into the trigger valve chamber 30a through the air passage. The air having the same pressure as the pressure accumulation chamber 10a is accumulated.

  At this time, the valve piston 31 is located at the top dead center. Since the valve piston 31 is located at the top dead center, the sleeve valve intake passage is opened, and the pressure accumulating chamber 10a and the sleeve valve control passage are communicated with each other. At the same time, since the second air passage is closed, the communication between the sleeve valve control passage and the atmosphere is blocked, and a part of the compressed air in the pressure accumulating chamber 10a flows into the sleeve valve control passage, and the sleeve valve chamber 10e. The air having the same pressure as that of the pressure accumulation chamber 10a is accumulated. Since a part of the compressed air in the pressure accumulating chamber 10a flows into the sleeve valve chamber 10e, the sleeve valve 51 is located at the top dead center by the urging force of the compressed air and the sleeve valve spring 53.

  When the sleeve valve 51 is located at the top dead center, an air passage (not shown) is opened. Therefore, the piston upper chamber 11b of the piston 12A in the cylinder 11 communicates with the atmosphere, and the piston upper chamber 11b is at atmospheric pressure. Further, since communication between the piston upper chamber 11b and the pressure accumulation chamber 10a is blocked, air from the pressure accumulation chamber 10a does not flow into the piston upper chamber 11b. Therefore, the piston 12A is stopped at the top dead center side.

  Next, both the pulling operation of the trigger 21 and the pressing operation of the push lever 23 against the driven material are performed, and the plunger 32 is pushed up to the top dead center. When the plunger 32 is positioned on the top dead center side, the trigger valve control passage is opened. As a result, the trigger valve chamber 30a communicates with the atmosphere, and the inside of the trigger valve chamber 30a is at atmospheric pressure. Further, the air passage is closed to block communication between the pressure accumulation chamber 10a and the trigger valve chamber 30a, and the inflow of air from the pressure accumulation chamber 10a into the trigger valve chamber 30a is stopped. As a result, since the pressure inside the trigger valve chamber 30a becomes atmospheric pressure, a difference occurs between the pressure received on the pressure accumulating chamber 10a side of the valve piston 31 and the pressure received on the trigger valve chamber 30a side, and the valve piston 31 moves to the bottom dead center.

  When the valve piston 31 is located at the bottom dead center, the sleeve valve inlet passage is closed, the communication between the sleeve valve control passage and the pressure accumulating chamber 10a is cut off, and air flows into the sleeve valve control passage from the pressure accumulating chamber 10a. Stops. Further, the second air passage is opened and the sleeve valve control passage communicates with the atmosphere. Thereby, the inside of the sleeve valve control passage becomes atmospheric pressure, and the inside of the sleeve valve chamber 10e connected to the sleeve valve control passage also becomes atmospheric pressure. When the inside of the sleeve valve chamber 10e becomes substantially atmospheric pressure, the sleeve valve 51 moves to the bottom dead center side.

  When the sleeve valve 51 starts to move to the bottom dead center side, the pressure accumulating chamber 10a and the piston upper chamber 11b of the piston 12A communicate with each other, so the sleeve valve 51 suddenly moves to the bottom dead center side, and the pressure accumulating chamber 10a and the piston 12A. The piston upper chamber 11b and the communication with the atmosphere are blocked.

  When the sleeve valve 51 moves from the top dead center to the bottom dead center, the compressed air flows into the piston upper chamber 11b of the piston 12A from the pressure accumulating chamber 10a, and the piston 12A suddenly moves to the bottom dead center side. A fastener (not shown) is driven by the portion 12C. At this time, as indicated by an arrow in FIG. 2, the compressed air pushes the frame 10 and the like upward with respect to the piston 12A as the piston 12A rapidly moves toward the bottom dead center. Further, the driver blade 12B receives a reaction force from a fastener (not shown) during driving, and pushes the frame 10 and the like upward through the compressed air in the piston upper chamber 11b.

  At this time, since the operator who uses the driving machine pulls the trigger 21 with the index finger, the operator grips the handle portion 100 with a finger other than the index finger. For this reason, when the frame 10 or the like is pushed upward by the reaction force, the frame 10 and the injection unit 13 rotate relative to the handle unit 100 with the pin 101 as the rotation axis. The direction of rotation is clockwise with respect to the handle portion 100 as shown in FIG.

  The front end of the magazine 41 connected to the injection unit 13 via the feeding mechanism 42 rotates in the clockwise direction with respect to the handle unit 100, whereas the rear end of the magazine 41 is connected to the handle unit 100. Since it is connected, the magazine 41 is pulled so as to be extended as shown by the arrow in FIG. For this reason, the reaction of the driving can be absorbed by the magazine 41.

  Further, since the magazine 41 is made of a resin as an elastic material, the magazine 41 is pulled when the magazine 41 is pulled between the end of the frame 10 and the other end of the handle portion 100 when a fastener such as a nail is driven. Can elastically stretch and absorb the reaction of driving. In addition, since the magazine 41 and the other end of the handle portion 100 are connected via an annular rubber 41AG, the magazine 41 absorbs the reaction of the driving when the fastener such as a nail is driven, and the annular rubber is coupled. The reaction can be effectively absorbed by 41AG.

  During the movement of the piston 12A toward the bottom dead center, the air below the piston 12A in the cylinder 11 flows into the return air chamber 10b via the air passage 11a. When the piston 12A passes through the check valve 12D, the compressed air in the piston upper chamber 11b of the piston 12A flows from the piston upper chamber 11b into the return air chamber 10b through the check valve 12D and the air passage 11a.

  Next, the sleeve valve 51 moves to the top dead center, the communication between the pressure accumulating chamber 10a and the piston upper chamber 11b of the piston 12A is cut off, and the piston upper chamber 11b communicates with the atmosphere. The lower side of the piston 12A is pressed by the compressed air accumulated in the return air chamber 10b, and the piston 12A suddenly moves to the top dead center side. The air in the piston upper chamber 11b is discharged from the exhaust hole to the atmosphere through an air passage (not shown).

  Thereafter, the piston 12A is pushed up by the compressed air in the piston lower chamber 11c and returned to the top dead center. As the piston 12A returns, the compressed air in the piston lower chamber 11c expands and the pressure decreases, and further decreases because the pressure is exhausted from the gap between the driver blade 12B of the piston 12A and the injection port 13a.

  Next, when the trigger 21 is returned or the pushing operation of the push lever 23 against the workpiece is stopped, the plunger 32 moves to the bottom dead center side by the pressure of the pressure accumulating chamber 10a acting on the upper end portion and the pressing force of the spring. To do. When the plunger 32 moves to the bottom dead center, the trigger valve control passage is blocked, and the compressed air in the pressure accumulating chamber 10a flows into the trigger valve chamber 30a through the air passage. When compressed air flows into the trigger valve chamber 30a, the valve piston 31 moves to the top dead center side by the pressing force generated by the difference between the area of the upper end face and the area of the lower end face of the valve piston 31 and the biasing force of the spring. To do.

  In the above embodiment, the frame 10 is provided as a separate member from the handle portion 100 and is provided so as to be rotatable with respect to the handle portion 100 around the pin 101. Accordingly, a part of the reaction force of the driving force acting on the cylinder 11 and the frame 10 when the nail as the fastener is driven is absorbed as the rotation of the frame 10 around the pin 101, so that the handle portion 100 directly The acting vibration can be reduced.

  Further, since the magazine is made of an elastic member, the reaction force acting on the cylinder 11 and the frame 10 when the nail is driven can be absorbed, and the vibration directly acting on the handle portion 100 can be reduced.

  In the present embodiment, one end portion of the handle portion 100 is externally mounted on the handle attachment portion 10A of the frame 10, but one end portion of the handle portion 100 is positioned inside the handle attachment portion 10A. That is, the handle mounting portion 10 </ b> A may be configured to be externally mounted on one end portion of the handle portion 100. In this case as well, the same effects as in the above embodiment are obtained.

  In the above embodiment, the O-ring 102 is used to maintain the airtightness of the animal pressure chamber 10a. However, an appropriate sealing structure can be used instead of the O-ring.

  Moreover, although the driving machine 1 is a driving machine which drives with compressed air and drives a nail, it is not limited to a driving machine for driving a nail.

  The driving machine of the present invention is particularly useful in the field of pneumatic driving machines that are required to have little reaction when driving nails or the like.

DESCRIPTION OF SYMBOLS 1 ... Driving machine 10 ... Frame 10A ... Handle attachment part 11 ... Cylinder 11b ... Piston upper chamber 11c ... Piston lower chamber 12A ... Piston 41 ... Magazine 41AG ..Ring ring rubber 41AG 100 ... Handle portion 101 ... Pin 103 ... Seal member

Claims (4)

A housing;
A pressure accumulating chamber that is provided in the housing and stores compressed air;
A cylinder provided in the housing and supported by the housing;
A handle portion attached to the handle attachment portion of the housing extending in a direction intersecting the axial direction of the cylinder;
A piston that is reciprocally movable in the cylinder, and that divides a space in the cylinder into a piston upper chamber located near one end of the cylinder and a piston lower chamber located near the other end of the cylinder; ,
A driving machine that generates a striking force in the axial direction of the cylinder by moving the piston in a direction from the piston upper chamber to the piston lower chamber by supplying compressed air from the pressure accumulation chamber to the piston upper chamber. Because
The handle portion is configured such that one end portion thereof is rotatable about a shaft member extending in a direction perpendicular to a plane including the axis of the cylinder and the axis of the handle attachment portion. A driving machine characterized by being attached to a handle mounting portion. A magazine holding a fastener driven by movement of the piston;
The magazine is a part of the housing and spans an end portion in a direction from the piston upper chamber toward the piston lower chamber and the other end portion of the handle portion, and the housing and the magazine 2. The driving machine according to claim 1, wherein the driving machine is attached to the handle portion.   3. The driving machine according to claim 2, wherein the magazine is made of an elastic material.   The driving machine according to claim 2 or 3, wherein the magazine and the other end of the handle portion are connected via a second elastic member.

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