JP2010125560A - Driving tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving tool of gas burning type etc. capable of ensuring its safety function in such a condition that a magazine is dismantled. <P>SOLUTION: A safety device includes an inner guide 17 having a nose at the tip and an interlocking plate retreating together with the inner guide 17. The inner guide 17 is covered with outer guides 19 and 20 while the interlocking plate is covered chiefly with a shroud 18, and therefore, the inner guide 17 and the interlocking plate cannot be operated to retreat irrespective of installation of the magazine 4. To a head 3, a stopper 55 engaged with and disengaged from the interlocking plate is attached rotatably, and energized by a spring 57 in the engaging attitude. In the condition that magazine 4 is installed, the stopper 55 is held by a pressing piece 58 in the free state, and when the magazine 4 is dismantled, the stopper 55 is held by the spring 57 in the locked condition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a type (or portable) type fastener driving tool such as a nailing machine or a hammering machine.

  Driving tools such as nailers and nailers use pneumatic pressure (compressed air), gas combustion pressure, or electromagnetic force, etc. In any case, a head is provided at the tip of the main body, a magazine is attached to the head (the magazine is often fixed to both the head and the main body), and the fastener is attached from the magazine to the head. One by one is supplied and driven into the workpiece with a blade. Of these, those using gas combustion pressure have the advantage of excellent maneuverability because no compressor is required and no hose is connected.

  In any case, these driving tools are provided with a safety device for preventing the punching of the fasteners that are directed toward the air. This safety device includes a probe (also called a push lever or a contact arm) that moves backward when it hits a workpiece. When the probe moves backward, the launch lock is released, and when the trigger is pulled, the blade moves forward. That is, the blade moves forward only when the probe is in contact with the workpiece.

  Further, in this type of driving tool, the magazine is generally detachable, and in the case of a pneumatic driving tool, the probe is generally exposed to the extent that it can be held and retreated by a person. Patent Document 1 discloses providing a stopper that holds the probe (the name of the publication is a push lever) so that it cannot move backward when the magazine is removed. That is, in Patent Document 1, when the magazine is removed, even if the probe is applied to the workpiece, the probe does not move backward, and therefore the trigger cannot be pulled.

  On the other hand, the probe (push lever) of Patent Document 1 is exposed so that a person can operate it by hand. Therefore, when the magazine is attached, the probe can be pulled in the air by pulling the probe by hand. is there. On the other hand, the applicant of the present application proposed in Patent Document 2 to provide a protection means that cannot operate a safety device such as a probe even when the magazine is attached or removed.

Note that the driving tool according to the embodiment of Patent Document 2 includes a movable inner guide that guides the fastener and the blade, and an outer guide that guides the slide of the inner guide. By exposing only a few dimensions from the tip of the guide, the inner guide is also used as a probe, and an interlocking member for releasing the launch lock is fixed to the inner guide. The driving tool according to the embodiment of Patent Document 1 has an advantage that, for example, driving into a narrow place can be easily performed because the tip portion of the inner guide is elongated.
JP-A-10-86077 JP 2004-167649 A

  Japanese Patent Publication No. 6-24720 is a prior art in Japanese Patent Publication No. 6-24720. When the description of this Japanese Patent Publication No. 6-24720 (particularly in the column of “Prior Art”) is taken into consideration, the magazine is removed in Japanese Patent Publication No. 6-24720. The reason why the probe is locked so that it cannot be retracted is to prevent the no-load drive that drives the blade when there is no fastener, and to misunderstand that only one fastener remains. Then, it can be said that it is to prevent launching in the air.

  More specifically, the driving tool of Patent Document 1 is exposed so that the probe can be picked up by a person and retracted, and therefore the probe cannot be retracted even if the probe is picked up with the magazine removed. By providing such a stopper, it is presumed that accidents with the magazine removed were prevented. On the other hand, in Patent Document 2, the safety device cannot be operated even if the magazine is removed, by preventing the function of the safety device from being deteriorated by removing the magazine, so that the air can be removed when the magazine is removed. It is intended to prevent fire and improve safety.

  The invention of the present application is based on Patent Document 2, and it is assumed that the magazine cannot be easily unlocked even if the magazine is attached or removed, and the safety with the magazine removed is further enhanced. It was made for the purpose of raising.

  The driving tool according to the present invention includes a main body in which a rod-shaped blade for driving a fastener is incorporated, a head provided at the front end of the main body for guiding the blade and the fastener, and a fastener in front of the blade. A magazine attached to the head for supplying one by one, a movable safety device that moves backward when it is pressed against a workpiece to release the blade lock, protective means that covers the safety device, and attachment of the magazine Protective means are provided to cover a person so that the safety device cannot be driven out and moved to the unlocked state regardless of the presence or absence of the safety device.

  In the first aspect of the invention, the head is provided with a stopper whose posture or position is switched between a free state in which the constituent members of the safety device are held so as to be able to move backward and a locked state where the components are held so as not to be able to move backward. The stopper is urged to a locked state by a spring means, and the magazine is provided with a pressing body that is freed against the spring means when the magazine is attached to the head. According to a second aspect of the present invention, in the first aspect, the stopper is covered with a protective means.

  According to the present invention, since the safety device is covered with the protective means regardless of whether the magazine is attached or removed, the fastener cannot be fired in the air regardless of whether or not the magazine is attached. And when the magazine is removed, the members that make up the safety device are not retractable, so even if you try to release the lock of the safety device by applying some device to the tip of the probe that makes up the safety device, The lock cannot be released, and even if an attempt is made to retreat by placing the fingertip on the tip of the probe with the intention of being injured, the probe cannot be retreated.

  In this way, in addition to the operation of the safety device being prevented by the protective means, it is impossible to move the probe backward with hands or equipment with the magazine removed. The air launch prevention function can be significantly improved to ensure high safety. Covering the stopper with a protective means as in claim 2 is particularly preferable because access to the stopper can be prevented.

  Next, embodiments of the present invention will be described with reference to the drawings.

(1) Overall Overview The present embodiment is applied to a driving tool for driving a scissors, pins, or nails using gas combustion pressure. 1 is a side view of the whole, and FIG. 2 is a perspective view as seen from the front. As shown in these figures, the driving tool includes a main body 1 having a built-in blade (rod) 2 and a main body. 1 is provided with a head 3 attached to the front end of 1 and a magazine 4 overlapping the lower surface of the head 3.

  The main body 1 includes a main body case 5 that encloses a cylinder, which will be described later, and a rear case 6 that is attached to the rear end of the main body 1. The gas can storage 8 is integrally provided. A trigger 9 is provided above the grip 7. A battery housing portion 10 is integrally provided at the lower end of the grip 7, and the battery housing portion 10 and the gas can housing portion 8 are integrally connected. A front cover 12 made of a material such as plastic or rubber is attached to the front of the main body case 5.

  3 is a side view with the magazine 4 removed from the main body 1, FIG. 4A is a perspective view of the head 3 in an inverted state, and FIG. 3B is a perspective view of the upper portion of the magazine 4. FIG. . As will be described in detail later, the head 3 includes a fixed outer guide 16, a movable inner guide 17, and a shroud 18. The outer guide 16 includes an upper member 19 and a lower member 20, and an inner guide 17 is disposed between the upper and lower members 19 and 20.

  The magazine 4 includes a storage portion 24 having a groove 23 in which the connecting fastener 21 is loaded, and an upper reinforcing member 25 fixed to the upper end thereof. The storage portion 24 pushes the connecting fastener 21 upward. The pusher 26 is attached. The pusher 26 is pulled upward by a spring (not shown).

  As can be understood from FIG. 4, the upper reinforcing member 25 of the magazine 4 has a first elongated hole 27 through which the fastener 22 is pulled out, and a portion of the first elongated hole 27 from which the head of the fastener 22 is pulled out is oblong and wide. This is a guide hole 28.

  On the other hand, as can be understood from FIG. 5, the outer guide 16 (and the inner guide 17) constituting the head 3 has a second elongated hole 29 communicating with the first elongated hole 27 of the magazine 4. 16, a guide protrusion 30 that fits in the guide hole 28 of the magazine 4 is formed on a portion of the lower member 20 surrounding the rear portion of the second elongated hole 29. The guide protrusion 30 and the guide hole 28 are fitted to each other. As a result of the alignment, the magazine 4 is held at its upper portion so as not to be laterally displaced.

  Further, as shown in FIG. 3, an upward hook-like locking part 31 is provided on the rear surface of the lower end of the magazine 4 in a side view, and a locking part 31 is provided on a forward projecting part 32 provided at the lower end of the gas can storage part 8. A guide groove (not shown) that fits from below is formed, and the locking portion 31 is sandwiched and fixed to the forward projecting portion 32 by a screw (not shown) screwed from the opposite side of the paper surface in FIGS. It is like that.

  At the lower end of the magazine 4, a stopper portion 33 is provided so as to contact the surface of the workpiece. This is in order to reduce the burden on the operator while driving the fastener 22 in an accurate posture by driving in a two-point support state.

  In this embodiment, the alignment direction of the connecting fasteners 22 is orthogonal to the axis of the blade 2, but the alignment direction of the fasteners 21 may be inclined with respect to the axis of the blade 2.

(2). Outline inside the main body Next, an outline inside the main body 1 will be described with reference to FIG. 5A is a longitudinal sectional side view of the front portion of the main body 1 and the head 3, and FIG. 5B is a front sectional view showing a state where members are separated. As shown in FIG. 5, a cylinder 35 is disposed inside the main body case 5, and a piston (not shown) including the blade 2 is slidably fitted into the cylinder 35.

  A bush 36 for guiding the blade 2 is mounted outside the front end portion of the cylinder 35, and a cushion rubber 37 is fitted into the front portion inside the cylinder 35. An exhaust hole (not shown) is formed in the front portion of the peripheral wall of the cylinder 35, and the combustion gas is discharged from the exhaust hole to the outside of the cylinder 35.

  Although not shown, a launch lock device is provided inside the main body 1 so that the blade 2 does not advance even if the trigger 9 is simply pulled. Various devices can be used as the launch lock device. For example, it can be a valve device provided in an appropriate part of a pipeline or the like for supplying fuel gas to the cylinder 35. In this case, the fuel gas cannot be supplied to the cylinder 35 even if the trigger 9 is pulled unless the lock on the valve device is released.

  As another locking device, for example, an electromagnetic valve provided at a jet port of a gas cartridge (cylinder) can be used. In this case, if the solenoid valve is not energized, the fuel gas is not supplied to the cylinder 35 even when the trigger 9 is pulled. Further, as another locking device, it is possible to provide a switch in the circuit for ignition, or to lock the trigger 9 itself (it is more preferable to use the lock on the trigger 9 itself and other methods together). is there.).

  An opening 38 for evacuating exhaust is vacant in the front portion of the main body case 5, and the combustion gas is discharged to the outside from the opening and discharged to the outside of the main body 1 from the vent hole 13 of the front cover 12. The

(3). Structure of Head Next, the structure of the head 3 and related parts will be described with reference to FIGS. 6 to 10 in addition to the previous drawings. 6 is a plan view with the shroud 18 broken, FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6, FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. FIG. 10A is a perspective view of a main part separated from the left side in a front view, and FIG. 10B is a perspective view of members.

  As described above, the head 3 includes the outer guide 16, the inner guide 17, and the shroud 18 made of a metal plate (for example, a steel plate). For example, as can be understood from FIG. 9, the inner guide 17 is formed in a cylindrical shape as a whole so that the blade 2 is slidably fitted therein, and a third downward opening through which the fastener 22 passes. The long hole 39 is vacant.

  A male screw is formed at the tip of the inner guide 17, and a nose 40 for adjusting the driving depth is screwed into the male screw. The nose 40 is an example of a probe. Moreover, the range near the rear end of the inner guide 17 is a small-diameter portion 17a. For this reason, a step 17b exists in the middle portion along the longitudinal direction. The rear end portion of the inner guide 17 is a cylindrical portion 17c. Needless to say, the tip of the inner guide 17 can be directly applied to the workpiece without providing the nose 40.

  For example, as shown in FIG. 9 and FIG. 10, the upper member 19 constituting the outer guide 16 includes a cylindrical portion 19a constituting the front portion thereof and a wide width portion 19b in which the cylindrical portion 19a is integrally connected ( The length of the cylinder part 19a can be set arbitrarily.) As shown in FIG. 5, the rear end portion 19 c of the wide width portion 19 b is fixed or attached to a block portion 41 protruding from the front surface of the cylinder 35 with screws 42, pins, or the like.

  As shown in FIG. 5B and FIG. 9, the upper member 19 of the outer guide 16 is formed with a fourth long hole 43 having a downward opening through which the fastener 22 passes, except for the front portion thereof. The portion where the fourth elongated hole 43 is formed is cut out so that the lower surface thereof is located above the lower surface of the cylindrical portion 19a, and the lower member 20 overlaps with the cut-out portion and is fixed with screws. Has been.

  As shown in FIG. 9, the upper member 19 is formed with a rectangular fifth long hole 44 penetrating vertically, and a block 45 is slidably fitted into the fourth long hole 44. The block 45 overlaps the small diameter portion 17 a of the inner guide 17. Further, the wide width portion 19b of the upper member 19 is a frame portion 19d having a high height around the fourth elongated hole 44, and the portions on the left and right sides of the frame portion 19d and the front portion of the rear portion 19c are stepped. The plate-like portion 19e is formed.

  A step portion 19f continuous to the frame portion 19d and the rear portion 19c is formed in a portion excluding the front portion of the plate-like portion 19e, and a through hole is formed in the front portion of the step portion 19f so that a screw receiving seat portion is formed. 19g is integrally provided, and the upper member 19 and the lower member 20 are integrally fastened by screwing a screw inserted from a location of the screw receiving seat portion 19g into the female screw hole 20b of the lower member 20. The front end surfaces of the left and right plate-like portions 19e in the upper member 19 are inclined so as to form a letter C in plan view.

  For example, as shown in FIG. 5A, an interlocking plate (interlocking member) 46 that is a component of the safety device is fixed to the upper surface of the block 45 with a screw 48 via a pressing plate 47. The holding plate 47 may be omitted. The interlocking plate 46 includes a tip horizontal portion 46a that overlaps the block 45 in plan view, and side plates 46b that hang downward from the left and right sides of the tip horizontal portion 46a. A pair of extending portions 46a extending rearward from the outside is continuous. The distal end of the extension 46a is engaged or abutted with a launch lock member (for example, a valve device). Therefore, when the interlocking plate 46 is fully retracted, the safety device is unlocked.

  The interlocking plate 46 is moved back and forth by a predetermined distance by a stroke holding means (not shown), and is pushed forward by a spring (not shown). When the inner guide 17 is retracted, the interlocking plate 46 is also retracted together against the spring.

  For example, as shown in FIG. 5A, the nose 40 of the inner guide 17 is exposed from the tip of the upper member 19 in the outer guide 16, and the nose 40 is hardly exposed from the upper member 19 (preferably, the nose. It is set so that the launch lock is not released unless the front end of 40 and the front end of the cylinder portion 19a are substantially flush with each other.

  The nose 40 (the tip of the inner guide 17 when the nose 40 is not present) can be picked with a finger. In that case, if the person can hold the nose 40 until it can be retracted to the extent that the safety device is unlocked, the meaning of the safety device disappears.

  In contrast, in the present embodiment, if the finger nose 40 is to be grasped with the finger to the retracted position where the lock is released, the tip of the finger is forced to press the tip end surface of the nose 40. Your fingertips are located on the top and you will be injured. For this reason, it can be said that it is virtually impossible to retreat the nose 40 with a finger.

  As described above, the lower member 20 of the outer guide 16 overlaps the range of the upper member 19 in which the fourth elongated hole 43 is formed, and has a plate-like appearance as a whole, and includes a screw. It is fixed to the upper member 19 (not shown). Further, as clearly shown in FIG. 9, the lower member 20 is formed with a groove 50 where the inner guide 17 overlaps from above so as to extend over the entire length.

  The lower member 20 of the outer guide 16 is provided with an overhanging portion 20 a that spreads outside the wide portion 19 b of the upper member 19. On the other hand, the front portion of the side plate 46 b in the interlocking plate 46 is positioned above the protruding portion 20 a of the lower member 20. Therefore, even if a person tries to retreat the interlocking plate 46 with a driver while the magazine 4 is removed, the overhanging portion 20a of the lower member 20 cannot be retracted due to the obstruction (the interlocking plate 46 cannot be accessed). . That is, the projecting portion 20a of the lower member 20 constitutes a part of protection means for preventing the interlocking member 46 from moving backward.

(4) The shroud shroud 18 is formed so as to cover the base portion of the cylindrical portion 19 a and the rear portion of the outer guide 16, and the interlocking plate 46 is also covered with the shroud 18. Although the shroud 18 basically has a shape that follows the planar shape of the outer guide 16, the planar shape of the outer guide 16 has a wider rear portion, so that the shroud 18 also has a shape and interlocking with the outer guide 16. In accordance with the arrangement of the plate 46, it has a stepped shape so that the rear has a large diameter.

  Since the overhanging portion 20 a is provided on the lower member 20 of the outer guide 16, a person cannot insert a finger, a driver, or the like between the lower member 20 and the shroud 18.

  As shown in FIGS. 5A and 8, an end plate 51 is integrally provided at the rear end of the shroud 18 by welding or the like, and this end plate 51 is fixed to the front surface of the cylinder 35 with a screw 52. . The screw 52 is a special one that is difficult to rotate with a general driver or wrench. Although the outer guide 16 of the embodiment is a vertical separation system, it can also be an integral system.

(5) Stopper means When the magazine 4 is removed, even if the nose 40 is pressed against the workpiece, the nose 40 does not move backward by the stopper means, and the safety device remains locked. This point will be described with reference to FIG. 11 and subsequent drawings in addition to the previous drawings.

  11A is a left side view of the main part, FIG. 11B is an enlarged view of a partially broken part of FIG. 12, and FIG. 12A is a cross-sectional view taken along the line XIIA-XIIA of FIG. , (B) is a sectional view taken along line BB of (A), and FIG. 13 is a left side view with the magazine 4 removed. 11A and 13, the outer shape of the shroud 18 is indicated by a thick line in order to facilitate understanding of the cover state by the shroud 18. In FIG. 12, the interlocking plate 46 is depicted as being directly fixed to the block 45 with bolts 48, and the screws are omitted from FIGS.

  For example, as can be easily understood from FIG. 10A, a pair of left and right bearing ribs 53 with holes formed in the front portion of the screw receiving seat portion 19g in the plate-like portion 19e of the upper member 19 in the outer guide 16. And a stopper 55 is rotatably attached to the bearing rib 53 with a pin 54. The stopper 55 extends long in the front-rear direction, and a pin 54 is inserted through a portion near the front end thereof. The rear end portion has an upward hook shape in a side view, and the stopper 55 is a horizontal end portion of the interlocking plate 46. It is arranged below 46a. When the stopper 55 rotates about the pin 54, the rear collar portion 55a is engaged with and disengaged from the rear horizontal portion 46a of the interlocking plate 46 from behind.

  As shown in FIG. 12A, the pin 54 is prevented from coming off by a snap ring 56. Further, a torsion spring (coil torsion spring) 57 is fitted in a portion of the pin 54 sandwiched between the left and right bearing ribs 53, and one end portion 57 a of the torsion spring 57 is connected to the plate-like portion 19 e of the upper member 19. Abutting from above, the other end portion 57b is bent in a crank shape, and its tip is fitted in a hole formed in the front end portion of the stopper 55. The torsion spring 57 urges the stopper 55 in such a direction that the flange portion 55a moves upward. Therefore, the stopper 55 is urged so as to engage with the tip horizontal portion 46 a of the interlocking plate 46.

  The front end of the stopper 55 slightly protrudes from the front end surface of the plate-like portion 19 e of the upper member 19. Then, as shown in FIGS. 11 to 13, a sheet metal pressing body 58 that can come into contact with the front end of the stopper 55 from below is fixed to the left side surface of the upper reinforcing body 25 constituting the upper end of the magazine 4 with a screw 59. ing. The screw 59 is also used for fixing the upper reinforcing plate 25 to the base material of the magazine 4. Further, the pressing body 58 is held in a fixed posture while being fastened by a single screw 59 by fitting an inward piece 58 a provided at the lower end thereof into the groove 60 of the upper reinforcing body 25. In FIG. 4, the thread 59 is displayed in a hexagonal hole method, and in FIG.

  The pressing body 58 has an elongated pressing portion 58b that protrudes above the upper reinforcing body 25. As shown in FIG. 11, when the magazine 4 is attached to the head, the front end of the stopper 55 faces upward at the pressing portion 58b. For this reason, the stopper 55 has a collar portion 55 positioned below the tip horizontal portion 46a of the interlocking plate 46, and thus the interlocking plate 46 is allowed to move backward. The pressing portion 58b is bent into an L shape in plan view, and therefore has a high rigidity even if it is thin due to the rib effect.

  As can be easily understood from the above description, when the magazine 4 is removed, the stopper 55 is released from the pressing action by the pressing body 58, so that the collar portion 55 a is moved horizontally by the spring force of the crane winding spring 56. Therefore, even if the nose 40 is pressed against the work, the interlocking plate 46 does not move backward and the safety device is not unlocked. Therefore, even if the nose 40 is moved backward by the equipment with the magazine 4 removed, the nose 40 does not move backward, so that high safety can be ensured.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, the form of the head and the safety device can be variously embodied as necessary. The form of the stopper and the pressing body can also be set according to the specific structure and form of the head and the safety device. Although the stopper of the above embodiment is a rotary type, it can be a slide type or a rotary type.

It is a side view of the whole driving tool concerning an embodiment. It is the perspective view seen from the front. It is a side view in the state where a magazine was removed from a main part. (A) is a perspective view of the head 3 in an inverted state, and (B) is a perspective view of the upper part of the magazine 4. (A) is a longitudinal side view of the front part of the main body and the head, and (B) is a front sectional view of the state in which the members are separated. It is a top view in the state where a shroud was fractured. It is VII-VII sectional drawing of FIG. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6. It is the isolation | separation perspective view which looked at the head from the right side. (A) is the principal part isolation | separation perspective view seen from the left side, (B) is a perspective view of a member. (A) is the left view of the principal part, (B) is the partially broken partial enlarged view of (A). 11A is a cross-sectional view taken along the line XIIA-XIIA in FIG. 11A, and FIG. 11B is a cross-sectional view taken along the line BB in FIG. It is a left view in the state where magazine 4 was removed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Blade 3 Head 4 Magazine 5 Main body case 9 Trigger 16 Outer guide 17 Inner guide 18 Shroud which is a main element of protection means 19 Upper member constituting the outer guide 20 Lower member constituting the outer guide 21 Connecting fastener 40 Nose ( probe)
46 Interlocking plate 46a which is a component of safety device Horizontal end 46a of interlocking plate
53 Bearing rib 54 Pin 55 Stopper 57 Crane spring as an example of spring means

Claims (2)

A main body in which a rod-shaped blade for driving a fastener is built, a head provided at the tip of the main body for guiding the blade and the fastener, and a head for supplying fasteners one by one to the front of the blade A magazine that is attached to a workpiece, a movable safety device that moves backward when pressed against a workpiece to release the blade lock, a protective means that covers the safety device, and whether or not the magazine is installed. And protective means for covering the device so that it cannot be moved to the unlocked state.
The driving tool
The head is provided with a stopper whose posture or position is switched between a free state in which the constituent members of the safety device can be moved backward and a locked state in which the safety member cannot be moved backward, and the stopper is locked by a spring means. On the other hand, the magazine is provided with a pressing body that forms a free state against the spring means when the magazine is attached to the head.
Driving tool. The stopper is covered with protective means,
The driving tool according to claim 1.

Images