JP4491204B2 - Fastener fastening device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fastener fastening device for fastening fasteners such as blind nuts and blind rivets to a member to be attached such as a panel.
[0002]
[Prior art]
The blind nut and the fastening device thereof are disclosed in, for example, International Publication WO99 / 04717 (Patent Document 1, corresponding to JP 2001-510733 A and US Pat. No. 6,277,899). . The blind nut is a hollow tubular body having a flange formed at one end and an internal thread formed inside, and is formed of a plastically deformable material such as metal, and is tubular in a mounting hole of a mounted member using a fastening device. The part is inserted until the flange comes into contact with the attached member, and a part of the tubular part is buckled and deformed, and the attached member is sandwiched between the buckled deformation part and the flange, and fixed to the attached member. (See FIGS. 3 to 8 of Patent Document 1). Since the blind nut can be operated from one direction, it is convenient for fastening the nut to a member that cannot be reached on the back side (blind side), for example, a mounted member such as a large panel. The blind nut fastened to the attached member can be screwed with a bolt for attaching another member to the attached member.
[0003]
A blind rivet is known as a blind fastener different from the blind nut. The blind rivet includes a rivet body including a hollow tubular portion and a flange formed at one end of the tubular portion, and a mandrel penetrating the rivet body. The mandrel extends a certain length from the flange side of the rivet body, and a head having a larger diameter than the other end is formed at the other end of the rivet body. When the mandrel part extending from the flange is strongly pulled out of the flange, the mandrel head deforms so as to expand the cylindrical part of the rivet body, and after forming a swelled part of a certain size, the flange side The mandrel breaks and is discharged. The blind rivet is fastened to the fastened member by sandwiching the fastened member between the flange and the enlarged diameter portion. A blind rivet fastening device is disclosed in Japanese Patent Laid-Open No. 7-299539 (Patent Document 2).
[0004]
[Problems to be solved by the invention]
1 and 2 of Patent Document 1, the blind nut fastening device of Patent Document 1 includes a mandrel (175) accommodated in a nose (6) so as to be able to advance and retract so as to be screwed into a female screw of the blind nut. A hydraulic piston (9) for drawing the mandrel in the axial direction, a hydraulic part (22) for supplying pressure oil to the hydraulic cylinder (10) containing the hydraulic piston, and a ram ( 21a), and constitutes a retracting means that operates to retract the blind nut held at the tip of the nose backward through the nose. The retraction means includes an air piston (25) connected to the ram (21a), an air cylinder (21) that houses the air piston, and a trigger valve (61) connected to the trigger lever. A pneumatic operation mechanism for performing the retraction operation is configured. In operation, referring to FIGS. 3 to 8 of Patent Document 1, the fastening portion of the blind nut protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened, and the tip of the nose is brought into contact with the member to be fastened. When the lever is pulled, compressed air is supplied to the air cylinder to move the air piston so that the ram enters the hydraulic part, and pressure oil is supplied from the hydraulic part to the hydraulic cylinder so that the hydraulic piston pulls the mandrel. Then, the fastening portion of the blind nut screwed to the mandrel is fastened to the attached member.
[0005]
Regarding the blind rivet fastening device of Patent Document 2, referring to FIGS. 1 to 3 of Patent Document 2, the fastening device was accommodated in the nose (11, 14) so as to be able to advance and retract so as to grip the mandrel of the blind rivet. A jaw (15), a hydraulic piston (12) that pulls the jaw in the axial direction, a hydraulic unit (21) that supplies pressure oil to a hydraulic cylinder (1c) that houses the hydraulic piston, and can be moved back and forth to the hydraulic unit And includes a ram (32a: FIG. 3) provided, and constitutes a retracting means that operates to retract the mandrel of the blind rivet held at the nose tip backward through the nose. As shown in FIG. 3 of Patent Document 3, the pneumatic operation mechanism for causing the retracting means to perform the retracting operation includes an air piston (32) connected to the ram (32a) and an air cylinder ( 31) and a trigger valve (37) connected to the trigger lever (24). In operation, when the trigger lever is operated in a state where the fastening portion (rivet body) of the blind rivet protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened and the tip of the nose is brought into contact with the member to be fastened, Compressed air is supplied to the air cylinder, the air piston is moved so that the ram enters the hydraulic part, pressure oil is supplied from the hydraulic part to the hydraulic cylinder, and the hydraulic piston moves so as to retract the jaws, and the blind rivet Fasten the rivet body to the mounted member.
[0006]
[Patent Document 1]
International Publication No. WO99 / 04917 (FIGS. 1 to 8 and explanation)
[Patent Document 2]
JP-A-7-299539 (FIGS. 1 to 3 and explanation)
[Patent Document 3]
JP-A-9-117869
[Patent Document 4]
Japanese Patent Application Laid-Open No. 11-111488
[0007]
[Problems to be solved by the invention]
In the conventional fastening device fastening devices of Patent Documents 1 and 2, when the nose tip is in contact with the fastened member when the nose tip is in contact with the fastened member, the fastening of the fastening device is properly performed. Fast fastening is possible according to the fastening force of the fastening device. FIG. 1A of the accompanying drawings of the present application shows that the blind nut 101 is properly fastened to the fastened member 102 by the flange 103 and the enlarged diameter portion 104. When the nose tip is fastened in a state of being in contact with the member to be fastened, the flange 103 is in contact with the member to be fastened 102 as shown in FIG. The fastening member 102 is fastened only at one part of the flange 103 and the enlarged diameter part 104, and is loose at the other part. Further, if the nose is not sufficiently pushed and the nose is slightly lifted from the fastened member 102, the gap is formed between the flange 103 and the fastened member 102 as shown in FIG. As a result, the blind nut 101 is fastened to the fastened member 102 in a loose state over the entire circumference of the flange. In order to prevent such oblique fastening and floating fastening, the operator is required to maintain the posture of the nose of the fastening device in an appropriate vertical position so that the nose is securely brought into contact with the member to be fastened. However, the worker is required to be skilled in order to prevent oblique fastening and floating fastening depending on the sense.
[0008]
Patent Document 3 (Japanese Patent Application Laid-Open No. 9-117869) discloses an electric driver in which a bolt or the like is inserted into a member to be attached and screwed. The electric driver of Patent Document 3 includes an adapter that holds a bolt at the tip, and has an insertion guide device that aligns the adapter with the axis of the mounting hole of the mounted member. The insertion guide device includes a fixing portion fixed to the driver main body, a holding plate that moves parallel to the axis of the adapter, a spring that is between the fixing portion and the holding plate and biases the holding plate in the distal direction, and a holding plate And a guide piece that extends from the bolt to the tip and can come into contact with the attached member. When the guide piece comes into contact with the mounted member, it helps to align the adapter with the axis of the mounting hole of the mounted member, and when the electric screwdriver is operated in that state, the bolt is screwed into the nut of the mounted member, The holding plate moves toward the fixed part and compresses the spring. The reaction force of the compressed spring is applied from the holding plate to the guide piece, and the bolt is screwed while maintaining contact with the attached member. In the electric driver of Patent Document 3, the holding plate is movably disposed on the driver main body, and, like a bolt, a fastener that is screwed into the nut of the attached member first and does not come off the nut by the subsequent operation. Suitable for fixing. However, if the fixing tool is not kept pressed against the fastening member even after being inserted into the hole of the fastening member like a fastening tool such as a blind rivet or a blind nut, it will come off from the fastening member. The holding plate that holds the guide piece extending to the tip by the tightening operation moves relative to the tool body and the reaction force from the compressed spring is gradually applied to the guide piece. This causes the operator to stagger the tip of the fastening tool. As a result, there is a possibility that oblique fastening as shown in FIG. 1 (B) may occur, and proper fastening cannot be expected.
[0009]
Patent Document 4 (Japanese Patent Laid-Open No. 11-114847) discloses a power screw tightening tool that uses a power source such as pressurized air. A contact member to a reference surface called a reaction force receiver is fixed to the tool as an arm extending obliquely in the tip direction. There is a risk of injury if an operator grasps the reaction force receiver by hand, and the tool of Patent Document 4 is provided with a safety mechanism. The safety mechanism includes a grip gripped by an operator newly fixed at an intermediate position between the handle of the tool and the reaction force receiver. Further, the grip is provided with a mechanical valve, and the handle is provided with the mechanical valve from the mechanical valve. An air valve that opens with pressurized air is provided, so that the operator can grip the grip with one hand to open the mechanical valve to open the handle air valve, thereby tightening the screw only when pressing the handle operating button with the other hand It is comprised so that operation | movement can be performed. Patent Document 4 is not aware of problems with diagonal fastening and floating fastening of fasteners such as blind rivets and blind nuts, nor does it suggest a configuration for preventing diagonal fastening or floating fastening.
[0010]
Accordingly, an object of the present invention is to provide a fastening device that can fasten a fixing tool such as a blind nut or a blind rivet to a member to be attached without depending on the operator's sense and without oblique fastening or floating fastening.
[0011]
[Means for Solving the Problems]
In order to achieve this object, the blind nut or blind rivet of the present invention is used. Is A fastener fastening device for fastening a fastener to a member to be attached includes a nose for holding the fastening portion of the fastener at the tip in a protruding state, and a retracting means for retracting the fastener held at the tip of the nose backward through the nose. Fastening of a fastener that projects from the tip of the nose, including a pneumatic operating mechanism for causing the retracting means to perform a retracting operation, and an air passage for sending compressed air from a compressed air supply source to the pneumatic operating mechanism The part is inserted into the mounting hole of the fastened member, the tip of the nose is brought into contact with the fastened member, compressed air is supplied to the pneumatic operation mechanism, and the fixing tool is fastened to the fastened member. In the fastener fastening device, a plurality of mechanical valves are provided in series in the air passage so as to supply compressed air from a compressed air supply source to the pneumatic operation mechanism, and the plurality of mechanical valves are provided in the rear portion of the nose. Outer peripheral surface Is fixed to the outer peripheral surface of the device part behind the nose, and each mechanical valve is elastically mounted with an operating pin that opens the valve when pressed toward the tip of the nose, and the operating pin protrudes from the tip of the nose. When the fastening portion of the fastener to be inserted is inserted into the mounting hole of the fastened member and the nose tip is brought into contact with the fastened member, each of the fasteners is formed to have a length having a tip that is pressed against the fastened member. The operating pin It extends along the axis of the mechanical valve from the mechanical valve to the tip side. , Tip of each operating pin Is The nose tip and the tip of the other operating pin are arranged so as to contact the fastening member at a position different from the tip of the other nose pin, and the fastening portion of the fixing tool protruding from the tip of the nose is inserted into the mounting hole of the fastening member. When the tip is brought into contact with the member to be fastened, compressed air is not supplied to the pneumatic operation mechanism unless all the operating pins are in contact with and pressed against the member to be fastened and all the mechanical valves are opened.
[0012]
As described above, when the fastener is fastened to the member to be fastened, when the fastening portion of the fastener protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened and the nose tip is brought into contact with the member to be fastened, all Compressed air is pneumatic unless all the mechanical valves are opened due to the operating pins of the Action Since it is not supplied to the mechanism, the fastener is fastened to the fastened member in a state in which the posture of the fastening device's nose is kept properly vertical and pressed properly, and in other cases, the fastening operation is not performed. Therefore, it is possible to fasten a fixing tool such as a blind nut or a blind rivet to the mounted member without depending on the operator's sense and without oblique fastening or floating fastening. In addition, since a mechanical valve (a valve that mechanically switches between opening and closing with an operating pin, etc.) is used, there is no need to install a new electric wiring or electric circuit as in the case of an electromagnetic sensor or an optical sensor. There is no increase in the handling burden on the operator as in the case where an electric cord is newly installed in the fastening device. Furthermore, when the fixing tool is not held by the nose, the operation of driving the fixing tool (so-called idle driving) is performed in such a way that compressed air is compressed by air unless all the operating pins are pressed against the member to be fastened. Action Since it is not supplied to the mechanism, it can be reliably prevented. Even if the fastening operation proceeds, each operating pin only presses the corresponding mechanical valve to the open position, so there is no reaction force against the tip of the nose, and the fastening operation does not become unstable.
[0013]
When three mechanical valves are provided and the tip of the nose comes into contact with the member to be fastened, each operating pin is arranged so that the tip of each of the pins contacts the member to be fastened at equal angular intervals on the outer periphery of the nose. Is preferred. Thus, the nose posture can be maintained perpendicular to the fastened member with a small number of mechanical valves. In addition, the operating pin extending from each of the mechanical valves preferably extends along the vicinity of the outer periphery of the nose at and around the tip of the nose. Thereby, the nose tip can be arranged in a narrow space and the fixing tool can be properly fastened.
[0014]
In the above fastener fastening device, when the trigger valve operated by the trigger lever is provided in the middle of the air passage, the mechanical valve can be provided in the air passage between the trigger valve and the compressed air supply source. A mechanical valve may be provided in the air passage between the trigger valve and the pneumatic operation mechanism.
[0015]
When the fixing tool is a blind nut, in the above-described fixing tool fastening device, the retracting means includes a mandrel accommodated in the nose so as to be screwed into the female screw of the blind nut, and the mandrel in the axial direction. The hydraulic piston includes a hydraulic piston that is retracted, a hydraulic unit that supplies pressure oil to a hydraulic cylinder that accommodates the hydraulic piston, and a ram that is provided in the hydraulic unit so as to be capable of moving forward and backward. The pneumatic operation mechanism is coupled to the ram. It includes an air piston, an air cylinder that houses the air piston, and a trigger valve. The fastening portion of the blind nut protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened, the tip of the nose is brought into contact with the member to be fastened, and all the operating pins of the mechanical valve are in contact with and pressed by the member to be fastened. When the trigger lever is operated while the mechanical valve is open, compressed air is supplied to the air cylinder and the air piston is moved so that the ram enters the hydraulic part, and pressure oil is supplied from the hydraulic part to the hydraulic cylinder. Then, the hydraulic piston moves so as to retract the mandrel, and the fastening portion of the blind nut screwed to the mandrel is fastened to the mounted member.
[0016]
When the fastener is a blind rivet, the retracting means of the fastener fastening device includes: a jaw accommodated in a nose so as to hold the mandrel of the blind rivet; and a hydraulic piston for axially retracting the jaw. A hydraulic part that supplies pressure oil to a hydraulic cylinder that houses the hydraulic piston, and a ram that is provided in the hydraulic part so as to be able to advance and retreat, and the pneumatic operation mechanism includes an air piston coupled to the ram, An air cylinder that houses the air piston and a trigger valve are included. The fastening part of the blind rivet protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened, the tip of the nose is brought into contact with the member to be fastened, and all the operating pins of the mechanical valve are brought into contact with and pressed by the member to be fastened. When the trigger lever is operated while the mechanical valve is open, compressed air is supplied to the air cylinder and the air piston is moved so that the ram enters the hydraulic part, and pressure oil is supplied from the hydraulic part to the hydraulic cylinder. Then, the hydraulic piston moves so as to retract the jaw, and the fastening portion of the blind rivet is fastened to the mounted member.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic cross-sectional view showing a fastener fastening device 1 using a blind nut as a fastener as one embodiment of the present invention. The fastening device 1 includes an elongated tool housing 2, a handle 3 that extends from an intermediate portion of the tool housing 2 so that the tool housing 2 can be held by hand, and an air cylinder portion 5 provided at a lower portion of the handle 3. . In the fastening device 1, for example, a hose (not shown) is connected to the handle 3, and compressed air is supplied to the inlet 4 </ b> A of the air passage 4 from a compressed air supply source such as a compressor. As shown in the drawing, a mandrel 7 in which a male screw that is screwed into a female screw of a blind nut is extended from a nose 6 at the tip of the tool housing 2. The mandrel 7 is connected to a rotating rod 10 extending from the nose 6 to the air motor 9 on the rear end side in the tool housing 2, and can be rotated around the axis by the air motor 9. The air motor 9 rotates the mandrel 7 forward about the axial center by compressed air passing through another air passage from the inlet 4 </ b> A and is attached to the mandrel 7. Reverse rotation to remove from the mandrel 7. Compressed air is supplied to the air motor 9 through a completion valve 11 that switches between forward rotation and reverse rotation. The completion valve 11 takes an operation position in which the air motor 9 is rotated in the reverse direction from the initial position in which the air motor 9 is rotated forward, and is normally in the initial position. When a fixing tool such as a blind nut is pressed against the mandrel 7 and the mandrel 7 is pressed into the nose 6, compressed air is sent to the air motor 9, and the mandrel 7 is rotated forward to screw the fixing tool. As the mandrel 7 is screwed into the fixing tool, the fixing tool comes into contact with the end surface of the nose and returns the mandrel 7 to exit the nose 6.
[0018]
In the tool housing 2, the mandrel 7 at the tip of the rod is attached to the nose of the tool housing 2 by pulling the rotating rod 10 rearward in the axial direction without inhibiting the rotation of the rotating rod 10 connected to the mandrel 7. A hydraulic operation mechanism 14 is provided as a retracting means for retracting in the direction 6. The hydraulic operation mechanism 14 includes a hollow hydraulic piston 15 that accommodates the rotation rod 10 so as not to inhibit rotation, a hydraulic cylinder 17 that accommodates the hydraulic piston 15 so as to be movable rearward, and a nose 6 from the hydraulic piston 15. And a hollow pulling rod 18 that accommodates the rotating rod 10 so as not to hinder the rotation. The pulling rod 18 is connected to the rotating rod 10 so as to surround the large-diameter portion on the tip side of the rotating rod 10, the rotating rod 10 is pulled rearward in the axial direction, and the mandrel 7 connected to the rotating rod 10 is attached to the tool housing 2. Pull in to nose 6. The hydraulic chamber 19 of the hydraulic cylinder 17 on the nose 6 side of the hydraulic piston 15 is filled with hydraulic oil. When pressure oil is introduced into the hydraulic chamber 19, the hydraulic piston 15 moves in the tool housing 2 toward the rear end. A spring 21 provided between the hydraulic piston 15 and the rear wall portion of the hydraulic cylinder 17 pushes back the hydraulic piston 15 toward the distal end of the tool housing 2 when the introduction of pressure oil into the hydraulic chamber 19 is released.
[0019]
The pressure oil introduced into the hydraulic chamber 19 is supplied through the passage 23 from the hydraulic section 22 inside the handle 3. The hydraulic section 22 is formed as a cylindrical cavity or cylinder that extends in the longitudinal direction of the handle 3 and accommodates hydraulic oil. A rod-shaped ram 25 is disposed below the hydraulic unit 22 so as to be able to advance and retreat in the longitudinal direction of the cylinder-shaped hydraulic unit 22. When the ram 25 enters the hydraulic unit 22, the hydraulic fluid therein is pressurized and pressurized oil and Thus, the oil is supplied to the hydraulic chamber 19 of the hydraulic cylinder 17 through the passage 23. The ram 25 is also a piston rod of an air piston 26 housed in an air cylinder part 5 provided at the lower part of the handle 3, and the ram 25 moves up and down in the hydraulic part 22 by the vertical movement of the air piston 26. The air piston 26 moves up and down in an air cylinder 27 formed inside the air cylinder portion 5. The air cylinder 27 is formed in a cylindrical large-diameter chamber, and an air piston 26 having a large pressure receiving area is obtained so that air pressure that can counteract the hydraulic pressure applied to the ram 25 by the hydraulic unit 22 is applied to the air piston 26. Yes. An inlet 29 for compressed air sent from the compressed air passage 4 is provided at the lower end of the air cylinder 27, and the compressed air is supplied to the chamber of the air cylinder 27 on the lower surface side of the air piston 26. The handle 3 or the air cylinder unit 5 is provided with a trigger valve 30 controlled by a trigger lever 31. When the trigger lever 31 is pulled, the compressed air is supplied from the compressor to the inlet 4 </ b> A and supplied through the air passage 4. Is introduced into the air cylinder 27. When the trigger lever 31 is released, the supply of compressed air stops.
[0020]
As described above, the hydraulic operation mechanism 14 as the retracting means performs the retracting operation because the air piston 26 connected to the ram 25 accommodated in the hydraulic unit 22 so as to be able to advance and retract, and the air accommodating the air piston 26. This is a pneumatic operation mechanism including a cylinder 27 and a trigger valve 30 provided in the air passage 4 controlled by the trigger lever 30. In the pneumatic operating mechanism, when the trigger lever 31 is operated, the trigger valve 30 is opened, compressed air is supplied to the air cylinder 27 through the air passage 4, and the air piston 26 moves so that the ram 25 enters the hydraulic section 22. Then, pressure oil is supplied from the hydraulic section 22 to the hydraulic chamber 19 of the hydraulic cylinder 17 so that the hydraulic piston 15 moves so as to retract the mandrel 7, and an intermediate tubular portion that is a fastening portion of the blind nut screwed to the mandrel 7 is moved. It is fastened to the fastened member by expanding and sandwiching the fastened member between the expanded portion and the flange.
[0021]
In the present invention, as shown in the lower left circuit of FIG. 2, the air passage 4 is provided with a plurality of mechanical valves 33A, 33B, and 33C in series, and compressed air from a compressed air supply source such as a compressor is mechanical valves. It is supplied to the air cylinder 27 of the pneumatic operation mechanism through 33A to 33C. These mechanical valves are normally closed types that normally block air flow, and do not open to allow air to flow unless the operating pin is pressed. The operating pin of each mechanical valve is elastically mounted on the mechanical valve so as to hold the mechanical valve in the cutoff position when not pressed. The mechanical valves 33 </ b> A to 33 </ b> C are attached to appropriate portions close to the nose 6 of the fastening device 1. For example, as shown in FIG. 2, it is attached to the outer periphery of the nose 6 or the tool housing 2 behind it. This is shown in detail in FIGS. Further, the number of mechanical valves may be arbitrary as long as it is at least two, but in the embodiment, it is three.
[0022]
In the illustrated embodiment, as shown in FIGS. 3 and 4, three mechanical valves 33 </ b> A to 33 </ b> C are provided on the outer peripheral surface of the rear portion of the nose 6 or the outer surface of the tool housing 2 behind the nose. Each of the mechanical valves 33 </ b> A to 33 </ b> C is mounted with an operating pin 34 that opens each mechanical valve by pressing toward the tip of the nose 6. Each actuating pin 34 extends from each of the mechanical valves 33A to 33C to the distal end side of a predetermined length coaxially with the axial center of the mechanical valve, and then contacts the member to be fastened at the distal end side and in the vicinity thereof. The contact pins 35 are offset so as to approach the outer peripheral surface of the nose 6 and extend in the axial direction in the immediate vicinity of the nose 6. In order to attach the mechanical valves 33A to 33C to the outer surface of the nose 6 or the rear tool housing 2, a mounting plate 37 is provided on the tool housing 2 (or nose 6). A support plate 38 is attached to the outer surface of the nose 6 to hold the operating pins 34 extending in the direction of the nose tip, including the contact pins 35 at the tip, in a movable manner along the axial direction of the nose 6.
[0023]
Each actuating pin 34, including the contact pin 35, is attached to the mandrel 7 and a blind nut fastening portion (tubular portion) protruding from the nose 6 is inserted into the fastening hole of the fastened member, and the nose tip is fastened to the fastened member. When it is made to contact | abut, it is formed in the length which has a front-end | tip pressed in contact with a to-be-fastened member. In other words, when the blind nut is fastened to the fastened member, if the nose 6 is brought into contact with the fastened member, the tip of the contact pin 35 of each operating pin 34 can also come into contact with the fastened member. Further, each of the contact pins 35 at the tip of the operating pin 34 is in a position different from the position of the tip of the nose 6 and is in contact with the member to be fastened at a position different from the tip of the contact pin 35 of the other operating pin 34. Has been placed. In the illustrated embodiment, the mandrel 7 at the tip of the nose 6 is centered on the outer peripheral side of the nose 6 so as to come into contact with the fastened member at equal angular intervals (that is, at intervals of 120 degrees).
[0024]
When the nose 6 is brought into contact with the member to be fastened vertically and accurately by the length and arrangement of the operation pins 34 (including the contact pins 35), all the contact pins 35 (and thus all the operation pins 34) are brought into contact with each other. Abuts on the fastened member. FIG. 5 shows that the blind nut 39 is attached to the mandrel 7 so that the nose 6 comes into contact with the fastened member 39 vertically and accurately, and all the contact pins 35 and all the working pins 34 come into contact with the fastened member 41. Indicates the state. When the nose 6 is further pressed against the fastened member 41 in this state, all the operating pins 34 are pressed, and all the mechanical valves 33A to 33C provided in series in the air passage 4 are opened so that compressed air flows. . Thus, when the trigger lever 31 is operated to open the trigger valve 30, compressed air is supplied to the inlet 29 of the air cylinder 27 through the air passage 4, and the nose 6 abuts the member to be fastened vertically and accurately. Therefore, the blind nut 39 can be properly fastened as shown in FIG.
[0025]
On the other hand, as shown in FIG. 6, when the nose 6 is pressed against the fastened member 41 in an oblique posture, any one or two contact pins 35 are pressed to press the operating pin 34. The corresponding mechanical valve is opened to allow compressed air to flow, but the remaining two or one contact pin 35 does not contact the fastened member 41. Therefore, since the corresponding operation pin 34 is not pressed, the corresponding mechanical valve is also maintained in the shut-off state. Therefore, the compressed air in the air passage 4 remains blocked, and even if the trigger lever 31 is operated to open the trigger valve 30, the compressed air is not supplied to the air cylinder 27 and the fastening operation is performed. I will not. That is, when the nose 6 is in an oblique posture, the fastening operation is not performed, and the oblique fastening in FIG. 1B is prevented. Further, as shown in FIG. 7, when the nose 6 does not sufficiently contact the fastened member 41 and there is a gap 42 and the contact is insufficient, three (all) contact pins 35 are attached to the fastened member 41. It does not contact or is not pressed even if it contacts. Therefore, all the operating pins 34 are not pressed, all the mechanical valves 33A to 33C are maintained in the blocked state, and the compressed air in the air passage 4 is maintained in the blocked state. Even in this case, even if the trigger lever 31 is operated to open the trigger valve 30, the compressed air is not supplied to the air cylinder 27 and the fastening operation is not performed. Accordingly, the fastening operation is not performed even when the nose 6 is not in contact with the member to be fastened, and the floating fastening in FIG. 1C is prevented.
[0026]
The mechanical valves 33 </ b> A to 33 </ b> C can be provided at any position as long as the air passage 4 is used. As shown in FIG. 2, when the trigger valve 30 operated by the trigger lever 31 is provided in the middle of the air passage 4, the mechanical valves 33A to 33C are connected to the trigger valve 30 and the inlet of the air cylinder 27 of the pneumatic operation mechanism. 29 may be provided in the air passage 4 between 29. Further, the mechanical valves 33A to 33C can be provided in the air passage 4 between the trigger valve 30 and the inlet 4A of the compressed air supply source.
[0027]
In this way, the blind nut can be securely fastened to the mounted member without depending on the operator's sense and without oblique fastening or floating fastening. In addition, since a mechanical valve is used, there is no need to install new electrical wiring or electrical circuits as in the case of electromagnetic sensors or optical sensors. It does not increase the handling burden on the operator such as routing. In addition, when the fixing tool is not held by the nose, the driving operation of the fixing tool (so-called idle driving) is performed so that the compressed air is supplied to the pneumatic operating mechanism unless all the operating pins are pressed against the fastening member. Since it is not supplied, it can be reliably prevented.
[0028]
The mechanical valve may be attached anywhere on the fastening device, but it is preferable to provide the mechanical valve on the outer peripheral surface of the rear portion of the nose or the outer surface of the device portion behind the nose because the operation pin and the contact pin can be kept short. The number of mechanical valves may be any number as long as it is at least two, that is, a plurality of mechanical valves. However, it is preferable that the number is three as the minimum number for surely knowing that the nose 6 is perpendicular to the surface of the member to be fastened. . In that case, when the tip of the nose comes into contact with the member to be fastened, each operating pin is preferably arranged so that the tip comes into contact with the member to be fastened at equal angular intervals on the outer periphery of the nose. Thus, the nose posture can be maintained perpendicular to the fastened member with a small number of mechanical valves. Further, it is preferable that the operating pin 35 extending from each of the mechanical valves is offset at the tip side to extend as a contact pin 35 along the vicinity of the outer periphery of the nose at and around the nose tip. Thereby, the nose tip can be arranged in a narrow space and the fixing tool can be properly fastened.
[0029]
FIG. 8 shows an embodiment in which the fixing tool is a blind rivet 43 and the fastening device is a blind rivet fastening device 45. The retracting means of the blind rivet of the fastening device 45 includes a jaw 46 accommodated in a nose so as to hold the mandrel of the blind rivet 43, and a hydraulic piston (not shown: hydraulic pressure in FIG. 2) that pulls the jaw in the axial direction. A hydraulic part 47 that supplies pressure oil to a hydraulic chamber (not shown: substantially the same as the hydraulic chamber 19 in FIG. 2) of the hydraulic cylinder that houses the hydraulic piston, and can move forward and backward. And a ram 49. The pneumatic operating mechanism that causes the drawing means to perform the drawing operation includes an air piston 50 connected to the ram 49, an air cylinder 51 that houses the air piston 50, and an air passage 53 that introduces compressed air from a compressor or the like. And a trigger valve 55 controlled by the trigger lever 54.
[0030]
Also in this embodiment, as shown in the lower left circuit of FIG. 8, three mechanical valves 57 are provided in series in the air passage 53, and compressed air from a compressed air supply source such as a compressor is supplied to the mechanical valve 57. Is supplied to the air cylinder 51 of the pneumatic operation mechanism. The operating pin 58 of each mechanical valve 57 is elastically mounted on the mechanical valve 57 so as to hold the mechanical valve 57 in the compressed air blocking position when not pressed. The number of mechanical valves 57 is arbitrary as long as it is plural, but three are provided. Although the attachment position is arbitrary, it is attached to the outer periphery of the nose 59 or the tool housing 61 behind the nose 59 as shown in FIG. Each actuating pin 58 extends from each of the mechanical valves 57 to the distal end side of a predetermined length coaxially with the axial center of the mechanical valve, and further contacts the to-be-fastened member at the nose distal end and in the vicinity thereof. 62 is offset so as to approach the outer peripheral surface of the nose 6 and extends in the axial direction in the immediate vicinity of the nose 6.
[0031]
Each actuating pin 58 includes a contact pin 62 and a fastening portion (rivet main body) of the blind rivet 43 protruding from the nose 59 is inserted into the mounting hole of the fastened member and the tip of the nose is brought into contact with the fastened member. The length is formed to have a tip that is pressed against the member to be fastened. Each of the contact pins 62 at the distal end of the operating pin 58 is in a position different from the position of the distal end of the nose 59 and is in contact with the member to be fastened at a position different from the distal end of the contact pin 62 of the other operating pin 58. It is arranged on the outer peripheral side of 58 so as to abut on the fastened member at equiangular intervals (that is, at intervals of 120 degrees).
[0032]
With the length and arrangement of the operating pins 58 (including the contact pins 62), when the nose 59 is brought into contact with the member to be fastened vertically and accurately, all the contact pins 62 are brought into contact with the member to be fastened. FIG. 9 shows that the blind rivet 43 is attached to the nose 59, and the nose 59 abuts the plurality of fastened members 63, 65 perpendicularly and accurately so that all the contact pins 62 and all the actuating pins 58 are fastened. The state which contact | abutted to is shown. When the nose 58 is further pressed against the fastened member 63 in this state, all the operating pins 58 are pressed, and all of the mechanical valves 57 provided in series in the air passage 53 are opened so that compressed air flows. Accordingly, when the trigger lever 54 is operated to open the trigger valve 55, the compressed air is supplied to the inlet of the air cylinder 51 through the air passage 53. In this way, the fastening portion (rivet body) of the blind rivet 43 protruding from the tip of the nose is inserted into the mounting holes of the fastened members 63 and 65, and the tip of the nose 59 is brought into contact with the fastened member 63. When the trigger lever 54 is operated in a state where all of the contact pins 62 of the operating pins 58 of the 57 are abutted and pressed against the fastened member 63 and all the mechanical valves 57 are opened to flow compressed air, the air cylinder 51 The compressed air is supplied to move the air piston 50 so that the ram 49 enters the hydraulic part 47, and the hydraulic oil from the hydraulic part 47 is supplied to the hydraulic cylinder of the drawing means so that the hydraulic piston pulls the jaw 46. Then, the fastening portion of the blind rivet 43 is fastened to the attached members 63 and 65. In this case, since the nose 59 is in contact with the fastened member 63 vertically and accurately, the blind rivet 43 can be properly fastened to the fastened members 63 and 65, and the fastened members 63 and 65 are mutually connected. Can be linked.
[0033]
On the other hand, as shown in FIG. 10, when the nose 59 is pressed against the fastened members 63 and 65 in an oblique posture, any one or two contact pins 62 are pressed and the operating pin 58 is pressed. And the corresponding mechanical valve 57 is opened to allow compressed air to flow. However, since the remaining two or one contact pin 62 does not abut on the fastened member 63, the corresponding operation pin 58 is not pressed, and the corresponding mechanical valve 57 is also maintained in the shut-off state. Accordingly, the compressed air in the air passage 53 remains blocked, and even if the trigger lever 54 is operated to open the trigger valve 55, the compressed air is not supplied to the air cylinder 51, and the fastening operation is performed. I will not. That is, when the nose 59 is in an oblique posture, the fastening operation is not performed, and the oblique fastening is prevented. In addition, when the nose 59 does not sufficiently contact the fastened member 63, the three (all) contact pins 62 do not touch the fastened member 63 or are not pressed even if they come into contact. Therefore, all the operating pins 58 are not pressed, all the mechanical valves 57 are maintained in the shut-off state, and the compressed air in the air passage 55 is kept in the shut-off state. Even in this case, even if the trigger lever 54 is operated to open the trigger valve 55, the compressed air is not supplied to the air cylinder 51 and the fastening operation is not performed. Therefore, even when the nose 59 is not in contact with the fastened member 63, the fastening operation is not performed, and the floating fastening can be prevented.
[0034]
The mechanical valve 57 can be provided at any position as long as it is the air passage 53. The mechanical valve may be attached anywhere on the fastening device. However, if the mechanical valve is provided on the outer peripheral surface of the rear portion of the nose or the outer surface of the device portion behind the nose, the operation pin and the contact pin can be kept short. The number of mechanical valves may be any number as long as it is at least two, that is, a plurality of mechanical valves, but the minimum number of three that can surely know that the nose 59 is perpendicular to the surface of the member to be fastened is three. preferable. In that case, when the tip of the nose comes into contact with the member to be fastened, each operating pin is preferably arranged so that the tip comes into contact with the member to be fastened at equal angular intervals on the outer periphery of the nose. Further, it is preferable that the operating pins extending from each of the mechanical valves are offset at the tip side to serve as contact pins and extend along the vicinity of the outer periphery of the nose at and around the nose tip. Thereby, the nose tip can be arranged in a narrow space and the fixing tool can be properly fastened.
[0035]
【The invention's effect】
According to the present invention, when fastening the fixing tool to the fastened member, when the fastening portion of the fastening tool protruding from the nose tip is inserted into the mounting hole of the fastened member and the nose tip is brought into contact with the fastened member, Compressed air is not supplied to the pneumatic operating mechanism unless all the operating pins are pressed against and contacted with the members to be fastened, and the nose posture of the fastening device is properly maintained vertically. The fastening tool is fastened to the fastened member in the pressed state, and the fastening operation is not performed in other cases. Therefore, it is possible to fasten a fixing tool such as a blind nut or a blind rivet to the mounted member without depending on the operator's sense and without oblique fastening or floating fastening. In addition, since a mechanical valve is used, there is no need to install new electrical wiring or an electric circuit as in the case of an electromagnetic sensor or an optical sensor, and an operator such as when an electric cord is installed in the fastening device. It does not increase the burden of handling. Further, when the fixing tool is not held by the nose, the operation of driving the fixing tool (so-called idle driving) is performed so that the compressed air is supplied to the pneumatic operating mechanism unless all the operating pins are pressed against the fastening member. Since it is not supplied, it can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a view showing a fastening state of a blind nut, (A) is a view showing a normal fastening state, (B) is a view showing an oblique fastening state, and (C) is a floating fastening state. FIG.
FIG. 2 is a configuration diagram of a blind nut fastening device according to an embodiment of the present invention when the fixing tool is a blind nut.
3 is a front view of the nose of the fastening device of FIG. 2 and a portion in the vicinity thereof.
4 is a left side view of the fastening device portion of FIG. 3. FIG.
5 is a view showing a state in which a blind nut is fastened in a state where a nose of the fastening device of FIG. 2 is in perpendicular contact with a member to be fastened.
6 is a view showing a state in which the blind nut is fastened in a state where the nose of the fastening device of FIG. 2 is in contact with the member to be fastened obliquely. FIG.
7 is a view showing a state in which a blind nut is fastened in a state where a nose of the fastening device in FIG. 2 is floating with respect to a member to be fastened.
FIG. 8 is a configuration diagram of a blind rivet fastening device according to another embodiment of the present invention when the fixing tool is a blind rivet.
9 is a view showing a state in which a blind rivet is fastened in a state in which a nose of the fastening device of FIG. 8 is in perpendicular contact with a member to be fastened.
10 is a view showing a state where the blind rivet is fastened in a state where the nose of the fastening device of FIG. 8 is in contact with the member to be fastened obliquely.
[Explanation of symbols]
101 Blind nut
102 Fastened member
103 flange
104 Enlarged diameter part of fastening part
1 Blind nut fastening device
2 Tool housing
3 Handle
4 Air passage
4A Inlet for intake of compressed air in the air passage
5 Air cylinder
6 Nose
7 Mandrel
9 Air motor
10 Rotating rod
11 Completion valve
14 Hydraulic operating mechanism (retraction means)
15 Hydraulic piston
17 Hydraulic cylinder
18 Pull rod
19 Hydraulic chamber
22 Hydraulic part
25 ram
26 Air piston
27 Air cylinder
29 Compressed air inlet of air cylinder
30 Trigger valve
31 Trigger lever
33 (33A to 33C) Mechanical valve air pressure setting valve
34 Actuation pin
35 Contact pin
37 Mounting plate
38 Support plate
39 Blind Nuts
41 Fastened member
43 Blind Rivet
45 Blind rivet fastening device
46 Joe
47 Hydraulic part
49 Lamb
50 Air piston
51 Air cylinder
53 Air passage
54 Trigger lever
55 Trigger valve
57 Mechanical valve
58 Actuation pin
59 Nose
61 Tool housing
62 Contact pin
63, 65 Fastened member

Claims (7)

A fixing device fastening device for fastening a fixing tool, which is a blind nut or a blind rivet , to a member to be attached, a nose for holding the fastening portion of the fixing tool in a protruding state and a fixing held at the tip of the nose A retracting means for retracting the tool backward through the nose, a pneumatic operating mechanism for causing the retracting means to perform a retracting operation, and an air passage for sending compressed air from a compressed air supply source to the pneumatic operating mechanism The fastening portion of the fixing tool protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened, the tip of the nose is brought into contact with the member to be fastened, and compressed air is supplied to the pneumatic operation mechanism. In the fastener fastening device configured to fasten the fastener to the member to be fastened,
In the air passage, a plurality of mechanical valves are provided in series so as to supply compressed air from the compressed air supply source to the pneumatic operation mechanism,
The plurality of mechanical valves are fixed to the outer peripheral surface of the rear portion of the nose or the outer peripheral surface of the device portion behind the nose, and each mechanical valve has an operating pin that opens the valve by pressing toward the tip of the nose. When the fastening portion of the fastener protruding from the tip of the nose is inserted into the mounting hole of the fastened member and the nose tip is brought into contact with the fastened member, the operating pin is Formed in a length having a tip pressed against the fastening member,
Each actuating pin extends from the mechanical valve to the tip side along the axis of the mechanical valve, and the tip of each actuating pin contacts the member to be fastened at a position different from the tip of the nose and the other actuating pin. When the fastening portion of the fastener protruding from the tip of the nose is inserted into the mounting hole of the fastened member and the nose tip is brought into contact with the fastened member, all the operating pins are Compressed air is not supplied to the pneumatic operation mechanism unless all mechanical valves are opened by being pressed against the member to be fastened.
A fastener fastening device characterized by that.   The apparatus according to claim 1, wherein the number of the mechanical valves is three, and when the tip of the nose contacts the member to be fastened, the operation pins of the mechanical valves are spaced at equal angular intervals on the outer periphery of the nose. An apparatus characterized by being arranged so as to abut against a member to be fastened   3. The apparatus according to claim 2, wherein the operating pin extending from each of the mechanical valves extends along an outer periphery of the nose at a nose tip.   4. The apparatus according to claim 1, wherein a trigger valve that is operated by a trigger lever is provided in the air passage, and the mechanical valve includes air between the trigger valve and the compressed air supply source. 5. An apparatus provided in a passage.   The apparatus according to any one of claims 1 to 3, wherein a trigger valve that is operated by a trigger lever is provided in the air passage, and the mechanical valve is air between the trigger valve and the pneumatic operation mechanism. An apparatus provided in a passage. In the apparatus of any one of Claims 1-5,
The fixing tool is a blind nut, and the pull-in means includes a mandrel accommodated in the nose so as to be engaged with a female screw of the blind nut, a hydraulic piston for pulling the mandrel in an axial direction, and the hydraulic pressure A hydraulic unit that supplies hydraulic oil to a hydraulic cylinder that houses the piston, and a ram that is provided in the hydraulic unit so as to be capable of advancing and retracting.The pneumatic operation mechanism includes an air piston coupled to the ram, Including an air cylinder that houses an air piston, and the trigger valve;
The fastening portion of the blind nut protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened, the tip of the nose is brought into contact with the member to be fastened, and all the operating pins of the mechanical valve are brought into contact with and pressed by the member to be fastened. When the trigger lever is operated with all the mechanical valves open, compressed air is supplied to the air cylinder to move the air piston so that the ram enters the hydraulic part. Pressure oil is supplied to the hydraulic cylinder, the hydraulic piston moves so as to retract the mandrel, and the fastening portion of the blind nut screwed into the mandrel is fastened to the attached member.
A device characterized by that. In the fixing device fastening device according to any one of claims 1 to 5,
The fixing tool is a blind rivet, and the retracting means includes a jaw accommodated in the nose so as to hold a mandrel of the blind rivet, a hydraulic piston for axially retracting the jaw, and the hydraulic piston Including a hydraulic part that supplies pressure oil to a hydraulic cylinder that houses the ram, and a ram that is provided in the hydraulic part so as to be capable of moving forward and backward
The pneumatic operation mechanism includes an air piston coupled to the ram, an air cylinder that houses the air piston, and the trigger valve,
The fastening portion of the blind rivet protruding from the tip of the nose is inserted into the mounting hole of the member to be fastened, the tip of the nose is brought into contact with the member to be fastened, and all the operating pins of the mechanical valve are brought into contact with and pressed by the member to be fastened. When the trigger lever is operated with all the mechanical valves open, compressed air is supplied to the air cylinder to move the air piston so that the ram enters the hydraulic part. Pressure oil is supplied to the hydraulic cylinder and the hydraulic piston moves so as to retract the jaws, and the fastening portion of the blind rivet is fastened to the attached member.
A device characterized by that.

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