JPH07299539A - Device for collecting rupture piece of fastening member in fastening tool - Google Patents

Abstract

PURPOSE:To extremely easily take out collected rupture pieces by mounting a lid on a container turnably around a shaft between a closing position where an opening for taking out rupture pieces is closed and an opening position where the opening is opened, and providing a holding means for holding this lid at the closing position. CONSTITUTION:The rear end part of a container 4 for containing a rupture pieces is opened, and an edge member 4a with a flange 4b is fixed to an opening part. A lid 5 is almost circular corresponding to a cylindrical container shape, and it is supported in turnable between a closing position and an opening position by a headed pin 6 provided so that the step-head pin projects in the axial direction above the flange 4b of the edge member 4a. When the lid 5 is set at the closing position, the ball 8b of a holding device 8 is engaged with the recessed part 8a of the edge member 4a to hold the lid 5 at the closing position. When the lid 5 is opened, the lid 5 is turned counterclockwise by operating a knob 8d. By this operation, the ball 8b of the holding device 8 is pushed into a ball case 8c against the energizing force of a spring 8e and is disengaged from the recessed part 8a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening tool for attaching a fastener of a type that breaks a stem portion during fastening. In particular, the present invention relates to a recovery device for recovering a fragment of a stem portion broken by fastening.

[0002]

2. Description of the Related Art A stem having an enlarged diameter portion at one end is passed through a hollow mandrel having a flange and the enlarged diameter portion of the stem is drawn into the hollow mandrel to cause a bulge at the end portion of the hollow mandrel. Conventionally, blind rivets of the type that are fastened together are well known. In this case, the stem can be pulled completely out of the mandrel,
Alternatively, the stem is fractured at a planned fracture portion. Further, as another type of fastener, a fastener of a type in which a collar is fastened by plastic deformation from the outside to a stud having a grooved portion or the like on the peripheral surface for fastening is well known as a lock bolt. When fastening this lock bolt,
Tighten the collar around the stud while pulling the stud axially. At this time, the stud is broken at the pre-formed breakable portion. In the following description, the term “stem” is used to include the studs of lock bolts in addition to the stems of the blind rivet described above. Further, the term “fragment of the stem portion” is used to mean not only a fragment of the stem that has been cut halfway, but also a stem that has been pulled out for fastening in a pull-out type blind rivet. Power operated fastening tools have been developed for fastening blind rivets and lock bolts of the type described above. The fastening tool is provided in a slender housing with a chuck mechanism for gripping the stem of the fastener in proximity to the open tip of the housing. This chuck mechanism is driven by a fluid pressure piston in the retracting direction in the housing to perform fastening. The broken fragment of the stem portion is released from the chuck mechanism, is sent in the housing in the axial direction, and is collected in the fragment fragment container provided at the other end of the housing. A negative pressure mechanism for applying a suction negative pressure to the fragment passage or the container formed in the housing is provided to send the fragment of the stem portion to the container. In a fastening tool of a type in which the chuck mechanism does not release after fastening, a fragment of a fastener to be fastened next is inserted into the chuck mechanism, whereby a fragment is ejected from the chuck mechanism axially inward of the fastening tool.

A conventional container for collecting broken fragments in this type of fastening tool has a cylindrical shape with one end closed and the other end opened, and the open end is screwed to the end of the housing and attached to the housing. ing.

[0004]

In the above-described conventional fragment-containing container, since the container is attached to the end of the housing by a screw, the container is rotated when the collected fragment is taken out. Must be removed from the housing, and vice versa, for subsequent use, to attach the container to the housing. As described above, the conventional device for recovering the broken pieces of the stem portion in this type of fastening tool is inconvenient to use. SUMMARY OF THE INVENTION It is an object of the present invention to solve the inconvenience in use of such a conventional recovery device and to provide a fragment recovery device for a fastening tool in which the recovered fragment can be taken out very easily.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, in the present invention, a broken piece extraction opening is formed in a storage container, and a lid is openably and closably attached to the broken piece extraction opening. The lid is attached to the storage container so as to be pivotable about an axis between a closed position for closing the fragment removal opening and an open position for opening the fragment removal opening. Further, a holding means for holding the lid in the closed position is provided. In a preferred aspect of the invention, the receiving container is a cylindrical container and is attached to the end of the housing.
The fragment breakout opening is preferably formed at the end of the cylindrical container, and the lid has a circular shape with a diameter corresponding to the cylindrical shape of the container, and a shaft provided so as to project in the axial direction at the end of the cylindrical container. Therefore, it is preferable to mount it so as to be pivotable in the plane of the fragment extraction opening. In a further preferred aspect of the present invention, the holding means includes a guide pin provided so as to axially project at a position diametrically opposite to the shaft supporting the lid at the open end of the cylindrical container, And a notch formed on the edge of the lid so as to engage with the guide pin. Further, the holding means includes a recessed portion provided at the open end of the cylindrical container, a ball provided on the lid so as to correspond to the recessed portion, and a ball case for holding the ball so as to partially project. It is preferable to further include a click stop mechanism including elastic means for urging the ball in the protruding direction. Place the ball case inside the knob on the lid,
It is preferable that the lid can be moved to the open position by operating the knob.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing an example of a blind rivet fastening tool embodying the present invention. This fastening tool includes an elongated housing 1, a grip portion 2 provided so as to extend laterally with respect to the housing, It is composed of an operating hydraulic pressure generator 3 provided at the lower end of the grip portion 2 and a fragment debris collection container 4 provided at the rear end of the housing 1. Figure 2
FIG. 3 is a sectional view showing the inside of the housing 1. As shown in the figure, a cylindrical nose piece 11 is attached to the open end of the housing 1. This nose piece 11
Has a shaft hole 11a for inserting a stem of a blind rivet (not shown) to be fastened. Housing 1
A cylindrical hydraulic cylinder 1a is formed inside, and a partition member 1b is fixed to the hydraulic cylinder 1a at a position on the front end side of the housing 1. Hydraulic cylinder 1a
Inside, a hydraulic piston 12 is slidably arranged in the axial direction of the housing 1, and a hydraulic chamber 1c is formed between the partition member 1b and the hydraulic piston 12. When hydraulic pressure is introduced into the hydraulic chamber 1c, the hydraulic piston 12 moves inside the housing 1 toward the rear end. A spring 18 is arranged between the hydraulic piston 12 and an end member 1d provided at the rear end of the housing 1, and pushes the hydraulic piston 12 back toward the tip of the housing 1 when the hydraulic pressure in the hydraulic chamber 1c is released.

The hydraulic piston 12 is hollow and has a hollow piston rod 12a extending axially toward the tip of the housing 1. A hollow connecting tube 13 is screwed to the tip of the piston rod 12a, and a jaw case 14 is screwed to the tip of the connecting tube 13. The jaw case 14 has an inner surface formed with a conical surface 14a that tapers toward the tip. A plurality of divided jaws 15 are arranged in the jaw case 14. The jaw 15 is a conical surface 14 of the jaw case 14.
The outer surface has a conical surface 15a corresponding to a, and the inner surface constitutes a gripping surface of the stem portion of the blind rivet. Inside the connection tube 13, a jaw pusher 16 is arranged so as to be guided by the inner cylindrical surface of the connection tube 13. The jaw pusher 16 is the jaw pusher 16.
A spring 17 arranged between the rear end and the connecting tube 13 urges the jaw 15 toward the jaw 15. The jaw case 14, the plurality of jaws 15, and the jaw pusher 16 constitute a chuck mechanism that holds the stem portion of the blind rivet. This chuck mechanism grips and pulls the stem portion of the blind rivet when the jaw case 14 is pulled rearward by the hydraulic piston 12 with the stem portion of the blind rivet inserted from the nose piece 11 into the jaw 15. Acts to make a fastening. When the hydraulic piston 12 is returned by the force of the spring 18, the jaws 15 relax and release the grip on the stem fragment. The structure and operation of this chuck mechanism is well known to those skilled in the art and will not be described further.

The broken piece container 4 described above is attached to the end member 1d at the rear end of the housing 1. The end member 1d of the housing 1 has a central opening 1e that opens toward the storage container 4, and a guide tube 19 that forms a fragment passage is fixed to the central opening 1e of the end member 1d. A slide tube 12b fixed to the hydraulic piston 12 is slidably passed in the guide tube 19 in the axial direction.
Along with 2, slide in the axial direction. Like this, Joe 15
Through the jaw pusher 16, the connecting tube 13, the piston rod 12a and the sliding tube 12b,
A debris collection passage through the guide tube 19 is formed.
FIG. 3 shows details of the operating oil pressure generator 3. This device 3
Includes a housing 31 having a cylindrical large-diameter pneumatic cylinder 31a therein and a pneumatic piston 32 slidably arranged in the cylinder 31a. The pneumatic piston 32 is provided with a piston rod 32a extending upward toward the grip portion 2. Grip part 2
A cylinder 2 that internally forms a cylindrical oil chamber 21
Two are provided. The lower end of the oil chamber 21 opens into the large diameter cylinder 31 a, and the upper end of the piston rod 32 a fixed to the pneumatic piston 32 is inserted into the oil chamber 21 of the grip portion 2.

A hydraulic discharge fitting 23 is fixed to the upper end of a cylinder 22 forming the oil chamber 21, and a discharge passage 23a of the discharge fitting 23 communicates with an oil chamber 1c in the housing 1. Therefore, when the air pressure is introduced into the large diameter pneumatic cylinder 31a below the pneumatic piston 32 and the piston 32 moves upward, the piston rod 32a moves upward in the cylinder 22 of the grip portion 2,
Hydraulic pressure is generated in the oil chamber 21. This hydraulic pressure is the discharge fitting 2
It is introduced into the oil chamber 1c in the housing 1 through the third discharge passage 23a to operate the hydraulic piston 12. A valve mechanism for introducing air pressure below the pneumatic piston 32 in the pneumatic cylinder 31a is provided in the housing 31 having the pneumatic cylinder 31a. This valve mechanism includes an air passage 33 formed in the housing 31 so as to open at the lower end of the pneumatic cylinder 31a.
Communicates with the air passage 35 through the valve seat 34. Pressurized air is introduced into the air passage 35 through an air hose 36 connected to an external pressurized air source (not shown). A poppet valve 37 is provided in the air passage 35 so as to correspond to the valve seat 34. This valve 37
Is urged toward the valve seat 34 by a spring 37a, and normally engages with the valve seat 34 to shut off the air passage 33 from the air passage 35.

A trigger 24 is provided in the housing of the grip part 2 for initiating the operation of the fastening tool. The trigger 24 is rotatably attached to the housing by a pivot shaft 24a, and is constantly urged to the illustrated position by the action of a spring 37d. One end of an upper valve actuating member 25 that is axially movable with respect to the housing of the grip portion 2 is attached to the trigger 24, and the lower end of the upper valve actuating member 25 has an upper end portion of a housing 31 as shown in FIG. Is connected to one end of a swing lever 39 provided on the. As shown in FIG. 3, a lower valve operating member 38 extending upward along the housing 31 is attached to the valve 37, and an upper end of the lower valve operating member 38 engages with the other end of the swing lever 39. . In this configuration, when the trigger 24 is pulled, the upper valve actuating member 25 is pulled upward and the lower valve actuating member 38 is pushed down by the action of the swing lever 39, so that the valve 37 is separated from the valve seat 34. Air passage 33 to air passage 3
Connect to 5. As a result, the pressurized air is introduced into the cylinder 31a below the pneumatic piston 32 and pushes the pneumatic piston 32 upward. As shown in FIG. 1, the structure for applying a suction negative pressure to the fragment recovery passage includes a metal fitting 40 for introducing pressurized air provided on a side portion of the housing 1. As shown in FIG. 4 a, this metal fitting 40 has a main body 41 attached to the side of the housing 1, and
An air passage 42 is formed in the inside in the axial direction. The air passage 42 is provided outside the guide tube 19 in the housing 1
It communicates with the air chamber 1f formed in the inside through the lateral passage 43. The other end of the air passage 42 is connected to a branch portion 35a provided at a connecting portion between the air passage 35 and the air hose 36 via a passage (not shown) arranged along the side portion of the grip portion 2 and the air housing 31. It is connected.

Inside the guide tube 19, at a position near the end, an orifice fitting 44 is fixed, one end of which projects into the fragment storage container 4. Further, inside the guide tube 19, an orifice tube 45 is arranged axially inward of the orifice fitting 44. The orifice fitting 44 is the orifice tube 45.
Has a conical surface 44a on the inner surface of the side end, and the conical surface 44a
Forms an orifice 46 facing the end of the orifice tube 45. An annular passage 47 is formed between the orifice tube 45 and the guide tube 19, and the annular passage 47 communicates from the inside of the orifice fitting 44 to the inside of the fragment container 4 through the orifice 46 on the one hand, and on the other hand. Radial passage 19a formed in guide tube 19
To communicate with the air chamber 1f in the housing 1 via. With this configuration, the pressurized air supplied to the air passage 42 enters the annular passage 47 from the air chamber 1f in the housing 1 through the passage 19a of the guide tube 19, and then passes through the orifice 46 from the wavy passage 47. It flows through the inside of the orifice fitting 44 and flows into the debris storage container 4. During this time, a high-speed air flow is generated from the orifice 46, and a suction negative pressure as indicated by an arrow in FIG. 4b is applied to the end portion of the orifice tube 45. Therefore, the suction negative pressure acts on the broken piece recovery passage, and the broken piece of the stem portion released from the chuck mechanism is sucked into the container 4 by the suction negative pressure. This structure is also known, and a detailed description thereof will be omitted.

Next, the structure of the fragment recovery device, which is an essential part of the present invention, will be described with reference to FIG. 8 and FIG. This recovery device is provided with the container 4 for containing the fragment described above. This container 4 has a cylindrical shape, and a rear end portion thereof is opened, and an edge member 4a having a flange 4b is fixed to the opening portion as shown in FIG. As shown in FIGS. 6 and 7, the lid 5 has a substantially circular shape corresponding to a cylindrical container shape, and the lid 5 is provided with a headed pin 6 provided on the flange 4b of the edge member 4a so as to project in the axial direction. It is rotatably supported between the closed position shown in FIG. 7 and the open position shown in FIG. As shown in FIG. 5, the pin 6 may be constituted by a screw,
A spacer 6a is arranged around the screw. The rim member 4 is provided at a position diametrically opposed to the pin 6.
A second pin with a head 7 protruding in the axial direction is provided at a.
This second pin 7 can also be constituted by a screw, and a spacer 7a is arranged around the screw. As shown in FIG. 6 and FIG.
To the position that engages the second pin 7 when is in the closed position,
A notch 5a is formed, and a guide edge 5b is formed from the notch 5a to the edge of the lid 5. The guide edge portion 5b is formed in an arc shape around the pin 6, and guides the movement of the lid by hitting the second pin 7 when the lid 5 is opened and closed.

A holding device 8 is provided between the lid 5 and the rim member for holding the lid 5 in the closed position. As shown in FIGS. 7 and 8, the holding device 8 includes a hemispherical recess 8a formed on the rear surface of the flange 4b of the edge member 4a and the recess 8a.
a ball 8b engaging with a. The ball 8b is arranged in the ball case 8c attached to the lid 5 so that a part of the ball 8b projects from the end of the ball case 8c. A knob 8d is provided so as to surround the ball case 8c. The ball 8b is the spring 8 arranged in the ball case 8c.
It is urged in the protruding direction by e. As shown in FIG. 8, when the lid 5 is in the closed position, the ball 8b of the holding device 8 engages with the recess 8a of the edge member 4a to hold the lid 5 in the closed position. When the lid 5 is opened, the knob 8d is operated to rotate the lid 5 counterclockwise in FIG. By this operation, the ball 8b of the holding device 8 is pushed into the ball case 8c against the biasing force of the spring 8e, and the recess 8
The engagement with a is released. When closing the lid 5, when the lid 5 is rotated clockwise from the position shown in FIG. 7 until the notch 5a hits the second pin 7, the ball 8b of the holding device 8 engages with the recess 8a of the edge member 4a. To meet.

[0014]

As described above, in the present invention, since the opening is formed in the container for collecting and storing the broken pieces of the fastener, and the lid is openably opened and closed, the collected broken pieces are collected. Easier to take out. In particular, in the structure in which the opening of the container is formed at the end of the container and the opening / closing lid is provided on the end surface of the container, the operation is further facilitated and the structure is simplified.

[Brief description of drawings]

FIG. 1 is a side view showing an entire blind rivet fastening tool embodying the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a blind rivet fastening operation part in the embodiment of FIG.

FIG. 3 is a cross-sectional view showing a hydraulic pressure generator in the embodiment of FIG.

4A is a partially cutaway sectional view showing a main part of the negative pressure generating device in the embodiment of FIG. 1, and FIG. 4B is an enlarged sectional view showing details of an orifice structure.

FIG. 5 is a cross-sectional view showing a structure for taking out a fragment of a container according to the present invention.

FIG. 6 is an end view of the storage container as viewed from the rear end side.

FIG. 7 is a cross-sectional view similar to FIG. 6 with the lid open.

FIG. 8 is a cross-sectional view showing an example of a lid holding device.

[Explanation of symbols]

 1 ... Housing, 2 ... Grip part, 3 ... Hydraulic pressure generating device, 4 ... Edge member, 4a ... Flange, 5 ... Lid, 6, 7 ... ... Pin, 8 ... Holding device, 12 ... Piston, 14 ... Jaw case, 15 ... Jaw, 19 ... Guide tube, 24 ... Trigger, 32 ... Pneumatic piston, 37 ... Valve.

Claims (5)

[Claims] 1. An elongated housing having an open end, and an axially movably disposed housing adjacent to the open end in the housing for releasably gripping a stem portion of a fastener to be broken. Provided on the other end of the housing, a chuck mechanism for breaking the stem, a fluid piston for breaking the stem by applying a pulling force in the axial direction to the chuck mechanism that grips the stem of the fastener to be broken. An accommodating container for accommodating a broken fragment of the stem; a fragment fragment recovery passage formed in the housing from the chuck mechanism through the fluid piston to the accommodating container; Suction means for applying a negative suction pressure to the recovery passage or the storage container in order to apply a suction force toward the storage container, In a fastener fragment recovery device in a fastening tool, the storage container includes a fragment extraction opening and a lid attached to the fragment extraction opening, the lid closing position for closing the fragment extraction opening. Holding means for holding the lid at the closed position, the holding means being attached to the storage container so as to be rotatable about an axis between the open position and the opened position for opening the fragment breakout opening. Fastener fragment recovery device for fastening tools. 2. The recovery device according to claim 1, wherein
The accommodation container is a cylindrical container attached to the other end of the housing, the fragment extraction opening is formed at an end of the cylindrical container, and the lid has a diameter corresponding to the cylindrical shape of the container. The recovery device is circular and is attached so as to be pivotable in the plane of the fragment extraction opening by a shaft provided at the end of the cylindrical container so as to project in the axial direction. 3. The recovery device according to claim 2,
The holding means includes a guide pin provided so as to project in the axial direction at a position diametrically opposed to the shaft at the end portion of the cylindrical container, and the lid of the lid so as to engage with the guide pin. A recovery device comprising a notch formed at an edge. 4. The recovery device according to claim 3,
The holding means includes a recess provided in the end of the cylindrical container, a ball provided in the lid so as to correspond to the recess, and a ball case for holding the ball so that a part thereof projects. The collecting device further comprising a click stop mechanism including an elastic means for urging the ball in a protruding direction. 5. The recovery device according to claim 4,
The ball case is arranged in a knob provided on the lid, and the lid can be operated to move the lid to an open position.