KR102135675B1 - Fastening unit of blind bolt - Google Patents

Abstract

The present invention relates to a blind bolt fastening unit which is coupled to a power tool for riveting to be used. More specifically, a jaw is formed and divided into four components. A taper part is formed on the left and right sides of the upper end of each component making up the jaw to form a plurality of cut grooves on the jaw by the taper part formed on each component when the four components are assembled by a snap ring. A plurality of protruding parts are formed on a front cap part coupled to a top housing, and the protruding parts come in contact with the cut grooves of the jaw to expand an inner space of the jaw to effectively move a blind bolt into the inner space of the jaw. When the jaw is separated from the protruding pars of the front cap part after the blind bolt enters, the jaw retracts and the blind bolt can be strongly fastened to the jaw.

Description

Blind bolt fastening unit {FASTENING UNIT OF BLIND BOLT}

The present invention relates to a blind bolt fastening unit used in conjunction with a power tool for riveting, and more particularly to a fastening unit that enables fastening without damaging the coating formed on the blind bolt.

Generally, a rivet is a mechanical element for fastening two or more materials against each other, and a fastening hole is punched in a plate to be fastened, a rivet is inserted, and then a locking jaw, that is, a head is formed by a hammer or other mechanical device. The riveting is completed. Since the riveting operation to perform such riveting is usually performed by hand, the connection process is complicated and the defect rate greatly depends on the skill of the operator.

Therefore, in recent years, various types of rivets have been developed to make the riveting operation simple and efficient. Among the rivets developed is a blind rivet.

Normally, to fasten blind rivets, a fastening hole is drilled in a portion of two or more plates facing each other, and the head of the blind rivet is inserted into the fastening hole so that the flange portion touches the plate, and then pulled using a separate tool. The head end of the expansion cylinder is extended.

Conventional blind bolt riveting device is a method of pulling the bolt by rotating the nut while the screw thread of the blind bolt is engaged, so that a strong friction force occurs between the thread of the bolt and the thread of the nut, resulting in a coating formed on the thread of the blind bolt. There is a problem of being damaged.

On the other hand, as a conventional technique for a riveting device, there is Korean Patent Registration No. 10-1828945.

The present invention is to solve the above-mentioned problems, the jaw (JAW) is divided into four parts to form a tapered portion on the upper left and right of each component constituting the jaw (JAW), the four parts are assembled by snap ring When the plurality of incision grooves are formed in the jaw by the tapered portions formed in the respective parts, and by forming a plurality of protrusions in the front cap portion coupled to the upper housing, the protrusions are formed with the incision grooves of the jaw. It is possible to make the blind bolt flow smoothly by extending the inner space of the jaw to abut, and when the jaw is separated from the protrusion of the front cap part after the blind bolt flows in, the jaw is closed and blinds An object of the present invention is to provide a blind bolt fastening unit capable of fastening a bolt to a jaw.

The problems to be solved by the present invention are not limited to the above-described problems, and other technical problems not mentioned will be clearly understood by a person having ordinary knowledge in the technical field to which the present invention pertains from the contents described below.

The blind bolt fastening unit according to the present invention for achieving the above object is a blind bolt fastening unit used in combination with a power tool for riveting, located inside the upper and lower housings, moving forward and backward, and having a tapered section at the upper end A jaw holder on which it is formed; A jaw clamper provided inside the jaw holder and moving forward and backward; Includes; provided on the upper end of the jaw clamper and moved forward and backward by the jaw clamper, characterized in that the jaw is composed of a plurality of parts with threads formed on the inside.

At this time, it is characterized in that the threads formed inside the plurality of parts constituting the jaw are formed differently to form a single spiral when the threads are combined.

In addition, a snap ring insert is formed at the lower end of each of the plurality of parts, and the plurality of parts are assembled while inserting the snap ring into the snap ring insert, thereby preventing the plurality of parts from being misaligned in the front-rear direction during operation. Is done.

In addition, the fastening unit further includes a front cap portion in which a plurality of protrusions for opening the jaws are formed at equal intervals in the circumferential direction, and at the top of the jaw, a tapered portion corresponding to the protrusion of the front cap portion; Characterized in that is formed.

In addition, a plurality of protrusions are formed at equal intervals in the circumferential direction at the upper end of the jaw clamper so that the plurality of parts constituting the jaw slide and open, corresponding to the protrusion of the jaw clamper at the bottom of the jaw clamper. It is characterized in that the formed tapered portion;

In addition, the blind bolt fastening unit used in combination with a power tool for riveting, located inside the upper and lower housings, moves forward and backward, and has a jaw holder in which a tapered section is formed at the upper end; A jaw clamper provided inside the jaw holder and moving forward and backward; A jaw provided at an upper end of the jaw clamper and moved back and forth by the jaw clamper; And a washer seated inside the jaw clamper to prevent the blind bolt from separating from the fastening unit before the jaw is completely closed after the blind is inserted into the fastening unit. It is characterized by consisting of a plurality of parts formed.

In addition, the washer is characterized in that a plurality of wing portions are formed.

In addition, it is characterized in that the tapered surface is formed on either or both of the washer fixing ring located on the upper and lower ends of the washer and the lower end of the inner surface of the coupling groove of the jaw clamper.

The blind bolt fastening unit according to the present invention is formed by dividing the jaw (JAW) into four parts, but forming a tapered portion on the upper left and right of each part constituting the jaw (JAW), formed on each part when four parts are assembled By forming a plurality of incision grooves on the upper end of the jaw (JAW) by the tapered portion, and at the same time by forming a plurality of protrusions in the front cap portion coupled to the upper housing, the protrusion abuts the jaw groove of the jaw (JAW) The inside space of JAW) can be extended to allow the blind bolt to flow smoothly, and if the jaw is spaced from the protrusion of the front cap after the bleed bolt flows in, the jaw is closed and the blind bolt is tightened ( JAW) has the effect that it can be fastened strongly.

In addition, as described above, the jaw (JAW) is divided into four parts, and a tapered portion is formed on the upper left and right sides of each of the four parts, so that the protrusion formed in the front cap part contacts the incision groove of the jaw (JAW). By making the four parts constituting each other open, threads can be formed up to the upper end of the inner surface of each of the four parts constituting the jaw so that the blind bolt can be tightened more strongly when the jaw is closed. It has an effect.

In addition, since the snap ring insert is formed at the lower end of each of the parts constituting the jaw, and the parts are assembled while the snap ring is inserted into the snap ring insert, the parts constituting the jaw are shifted in the front-rear direction during the operation of the parts constituting the jaw. It is prevented from being misaligned, so that the thread of the blind bolt fastened to the jaw can be prevented from being damaged.

In addition, after the blind bolt is inserted into the fastening unit, the washer is temporarily fastened with the blind bolt before the jaw is completely closed, and a washer that prevents the blind bolt from separating from the fastening unit is formed of a flexible resin material, The durability of the washer is improved by securing a space through which the washer can flow.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a state in which a blind bolt fastening unit according to a preferred embodiment of the present invention is coupled to a power tool.
2 is a perspective view of a blind bolt fastening unit according to a preferred embodiment of the present invention.
3 and 4 is an exploded perspective view of the blind bolt fastening unit according to a preferred embodiment of the present invention.
5 is a perspective view of a jaw holder constituting a blind bolt fastening unit according to a preferred embodiment of the present invention.
6 is a perspective view of a jaw (JAW) included in the blind bolt fastening unit according to a preferred embodiment of the present invention.
7 is a view showing a process in which the jaw (JAW) is opened and closed by the front cap part and the jaw clamper in the blind bolt fastening unit according to the preferred embodiment of the present invention.
8 is a bottom and plan view of the front cap portion and the jaw clamper included in the blind bolt fastening unit according to the preferred embodiment of the present invention.
9 is a cross-sectional view of a blind bolt fastening unit according to a preferred embodiment of the present invention.
10 is a schematic view for showing that a flow space of a washer is formed in a blind bolt fastening unit according to another preferred embodiment of the present invention.
11 is a plan view of a washer included in the blind bolt fastening unit according to another preferred embodiment of the present invention.
12 is a view showing a state of the blind bolt fastened to the blind bolt fastening unit according to another preferred embodiment of the present invention.

With reference to the accompanying drawings for a preferred embodiment of the present invention will be described in more detail, but for the brevity of description, the technical parts that have already been well-known will be omitted or compressed.

Hereinafter, a blind bolt fastening unit according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a blind bolt fastening unit coupled to a power tool according to a preferred embodiment of the present invention, Figure 2 is a perspective view of a blind bolt fastening unit according to a preferred embodiment of the present invention, Figure 3 and Figure 4 is an exploded perspective view of a blind bolt fastening unit according to a preferred embodiment of the present invention, Figure 5 is a perspective view of a jaw holder constituting the blind bolt fastening unit according to a preferred embodiment of the present invention, Figure 6 is the present invention It is a perspective view of the jaw (JAW) included in the blind bolt fastening unit according to a preferred embodiment, Figure 7 is a jaw (JAW) is opened by the front cap portion and the jaw clamper in the blind bolt fastening unit according to a preferred embodiment of the present invention 8 is a view showing the process of closing, and FIG. 8 is a bottom and plan view of the front cap part and the jaw clamper included in the blind bolt fastening unit according to the preferred embodiment of the present invention, and FIG. 9 is according to a preferred embodiment of the present invention 10 is a schematic view for showing that a flow space of a washer is formed in a blind bolt fastening unit according to another preferred embodiment of the present invention, and FIG. 11 is according to another preferred embodiment of the present invention It is a plan view of a washer included in the blind bolt fastening unit, Figure 12 is a view showing the state of the blind bolt fastened to the blind bolt fastening unit according to another embodiment of the present invention.

1 to 12, the blind bolt fastening unit 100 according to a preferred embodiment of the present invention is used in combination with a power tool 200 made of a pistol shape, and a coupling portion of the lower housing 130 When coupled with the power tool 200 through 131, the drive shaft 201 of the power tool 200 is fastened to the lower end of the jaw holder 140, and as the drive shaft 201 moves forward and backward, the jaw holder 140 also At the same time, it moves forward and backward in the upper and lower housings 120 and 130.

The bolt fastening unit 100 of the present invention as described above is a front cap portion 110 coupled to the top of the top housing 120, a bottom housing 130 coupled to the bottom of the top housing 120, and the upper and lower ends It is formed by including the jaw holder 140 and the jaw (150, JAW) and the jaw clamper 170 provided inside the jaw holder 140, which is located inside the housing (120, 130) and moves forward and backward.

The front cap part 110 is a configuration that serves to help the jaw bolts 300 to be inserted into or detached from the fastening unit 100 without interference by helping the jaws 150 and JAW to be described later, the front cap part ( At the top center of the top 110, a fastening hole 112 through which the blind bolt 300 can be drawn is formed, and at the bottom, a plurality of protrusions 111 are arranged at equal intervals in the circumferential direction in a form surrounding the fastening hole 112. It is formed, the protrusion 111 is in contact with the cutting groove 156 of the jaw (150, JAW) to be described later serves to open the jaw (150, JAW). The front cap portion 110 is coupled to the front end of the upper housing 120 through the coupler 113.

The jaw holder 140 is coupled to the drive shaft 201 of the power tool 200 to reciprocate inside the front and rear housings 120 and 130 to pull a screw fastened to the jaw 150. In the upper part, a taper section 141 is formed in which a certain section inner diameter is reduced so that the jaws 150 and JAW are retracted, and a coupling groove 173 of the jaw clamper 170 and the jaw clamper 170 is formed therein. ) Is seated on the washer 160, the coupling groove 173 of the jaw clamper 170, the washer fixing ring 161 for fixing the washer 160 from the top, the top of the jaw clamper 170 It is formed on the lower end of the jaw clamper (150, JAW) and the jaw clamper 170 is provided with a spring 174 to elastically support the jaw clamper 170 in the upper direction.

A coupling groove 173 in which the washer 160 is seated is formed at the center of the jaw clamper 170, and a plurality of protrusions 171 are formed at equal intervals in the circumferential direction in a form surrounding the coupling groove 173. In the space between the protrusions 171, a seating groove 172 in which the lower surfaces of the respective parts 155 of the jaws 150 and JAW are seated is formed. In addition, a spring 174 for elastically supporting the jaw clamper 170 in the upper direction is provided at the bottom of the jaw clamper 170. At this time, the parts 155 of the jaws 150 and JAW are not perfectly seated in the seating groove 172, but are fixed to be spaced apart from the bottom surface by contacting the protrusion 171. .

After the blind bolt 300 is inserted into the fastening unit 100, the washer 160 is temporarily fastened with the blind bolt 300 before the jaws 150 and JAW are completely closed, so that the blind bolt 300 is fastened. With a configuration that serves to prevent the unit 100 from being detached, it is formed of a flexible resin material and is seated in the coupling groove 173 of the jaw clamper 170, and the washer fixing ring is placed at the top of the washer 160 ( 161) is seated to secure the washer 160 to the coupling groove 173 of the jaw clamper 170. At this time, as shown in FIGS. 9 to 11, the wing portion 160a of the washer protrudes in an inner direction more than the inner circumferential surface of the coupling groove 173 formed in the center of the jaw clamper 170, and the washer 160 ) The lower side of the inner surface of the coupling groove 173 of the jaw clamper 170 seated and the lower inner surface of the washer fixing ring 161 fixing the washer 160 are tapered surfaces 170a and 161a, respectively. . Accordingly, a space through which the inner surface of the washer 160 through which the blind bolt 300 passes is formed to flow up and down is formed so that the washer 160 when the blind bolt 300 passes through the washer 160. The wing portion 160a of the can be bent smoothly without being bent rapidly, thereby improving the durability of the washer 160 and facilitating entry and exit of the blind bolt 300. If the tapered surfaces 170a and 161a are not present, the wing portion 160a of the washer hardly bends, and the friction force becomes very large, and accordingly, the wing portion 160a of the washer is rapidly worn.

The jaw (150. JAW) is divided into four parts 155, the upper and lower left and right of each part 155 of the front cap portion 110 and the jaw clamper 170, respectively formed of the protrusions 111, 171 Tapered portions 152 and 153 are formed to facilitate sliding by contacting the inclined surface. In addition, a thread 154 in a shape corresponding to a thread formed in the blind bolt 300 is formed on the inner surface of each component 155 to fasten the blind bolt 300.

When the four parts 155 configured as described above are combined to form the jaws 150 and JAW, the upper and lower ends of the jaws 150 and JAW have tapered portions 152 and 153 formed on each of the four parts 155. By the cut groove 156 is formed. At this time, as shown in FIG. 6, a snap ring inserting portion 157 is formed at a lower end of each of the parts 155, and the parts 155 are inserted while inserting a snap ring 151 into the snap ring inserting part 157. Because of the assembly, the parts 155 constituting the jaws 150 and JAW are prevented from being misaligned in the front-rear direction during operation. When the threads 154 of the four parts 155 are combined with each other, since the threads 154 are formed differently so as to form one spiral (single spiral), the displacement of the individual parts 155 is a single spiral. Is damaged, and if the single bolt of the threads 154 is bitten by the blind bolt 300, the threads of the blind bolt 300 are damaged. Therefore, according to the present invention, since the displacement of the jaws 150 and JAW is prevented by the snap ring 151, the threads of the blind bolts 300 fastened to the jaws 150 and JAW can be prevented from being damaged. At this time, when the four parts 155 of the jaws 150 and JAW were combined, it was said to constitute a single helix, and this is the same principle as if a single nut is cut into four, and when four pieces are combined again, a single helix is formed. .

On the other hand, the jaw (150, JAW) is configured as described above, as shown in Figures 7 and 8, the cutting groove 156 at the top of the front cap portion 110 and the protruding portion 111 of the jaw 150, JAW ), the front end portion of each component 155 is slid in the radially outward direction along the inclined surface of the protruding portion 111 of the front cap portion 110, and the rear end portion is corresponding to the front end of the jaw clamper 170. The inner space of the jaws 150 and JAW expands while sliding from the seating groove 172 to the radially outer side along the protrusion 171. That is, initially, the front end of the parts 155 constituting the jaws 150 and JAW are in a state of being in contact with a narrow space a1 as shown in FIG. 8, and then widened when forcedly pushed. The paper slides radially outward (a2).

As a result, the protruding portion 111 of the front cap portion 110 serves to open the front end portion of the jaw 150, JAW, and the protruding portion 171 of the jaw clamper 170 is also a rear end portion of the jaw 150, JAW. It acts to spread evenly symmetrically in response to the opening of the front end portion of the jaw (150, JAW), while also spreading the jaw (150, JAW) from the front and back together.

Hereinafter, with reference to FIGS. 1 to 12, the operation process of the blind bolt fastening unit 100 according to the preferred embodiment of the present invention and the effect of the action will be described in detail.

First, since the drive shaft 201 of the power tool 200 is in the advanced state in the preparation stage for work, the jaw holder 140 connected to the drive shaft 201 is also fixed to the upper end of the upper and lower housings 120 and 130. As a result, as shown in Figure 9 (a), while the jaw clamper 170 is maintained in an elevated state by the spring 174, the incision groove 156 at the top of the jaws 150, JAW is the front cap portion 110 ) While the four parts 155 constituting the jaws 150 and JAW contacting the protruding parts 111 slide along the space between the inclined surfaces of the protruding parts 111 of the front cap part 110, the jaws 150, The inner space of the JAW) is opened so that the blind bolt 300 can enter. At this time, the protruding portion 111 of the front cap portion 110 is drawn to the upper inner side of the jaw holder 140, so that the jaws 150 and JAW are fixed to the uppermost end of the tapered section 141 so that the jaw ( 150, JAW).

Next, when the operator inserts the bolt 301 portion of the blind bolt 300 through the fastening hole 112 of the front cap portion 110, the jaws 150 and JAW in which the bolt 301 is open and the washer As it is inserted through the 160 and the jaw clamper 170, it is temporarily fixed by the wing portion 160a of the washer 160 to prevent the blind bolt 300 from being detached from the fastening unit 100. At this time, as shown in FIGS. 9 to 11, the washer fixing ring 161 for fixing the lower end of the inner surface of the coupling groove 173 of the jaw clamper 170 to which the washer 160 is seated and the washer 160 Tapered surfaces 170a and 161a are formed on the lower inner surface of each other, and accordingly, a space through which the inner surface of the washer 160 through which the blind bolt 300 passes can be vertically formed to form the blind bolt ( When the 300) passes through the washer 160, the inside surface of the washer 160 is bent smoothly without being bent, and the blind bolt 300 is temporarily fixed after passing through the blind bolt 300, so that the washer ( The durability of 160) is improved.

Thereafter, when the operator operates the power tool 200, the drive shaft 201 retreats to the rear and the jaw holder 140 also moves to the rear at the same time, and accordingly, the jaws 150 and JAW as shown in FIG. 9(b). ) As the jaw clamper 170 rises by the spring 174 to push the jaws 150 and JAW as the jaw clamper 170 rises away from the protruding portion 111 of the front cap 110, the jaws 150 and JAW taper section ( It moves to the top of 141) and is completely closed. Therefore, the blind bolt 300 is strongly clamped to the jaws 150 and JAW while the threads 154 of the jaws 150 and JAW bit the threads formed on the bolt 301 of the blind bolt 300.

As described above, the sleeve 302 of the blind bolt 300 formed of a relatively soft metal is compressed and deformed as the blind bolt 300 is pulled back in a state of being strongly clamped to the jaws 150 and JAW, thereby expanding to the outside. The rivet head is formed on the opposite side of the flange portion 303.

When the work is completed, the drive shaft 201 of the power tool 200 advances again, and the jaw holder 140 also advances at the same time, and accordingly, the jaws 150 and JAW of the front cap part ( 110) is brought into contact with the protruding portion 111 again. Therefore, the engagement of the fastening unit 100 can be released from the fastened blind bolt 300 by the engagement of the blind bolt 300 being released.

In the present invention as described above, the jaws 150 and JAW are divided into four parts 155, and the tapered parts 152 are formed on the upper left and right sides of each of the four parts 155 to form protrusions formed on the front cap part 110. When the (111) abuts the incision groove 156 of the jaws (150, JAW), the four parts (155) constituting the jaws (150, JAW) are separated from each other, thereby forming the jaws (150, JAW). It is possible to form the threads 154 to the upper end of each inner surface of each of the parts 155, so that the jaw 150 and JAW are closed, so that the blind bolt 300 can be tightened more strongly. If a tapered section is formed at the upper end of the inner side of the jaw and the structure for opening the jaw is drawn into the inner side of the jaw and the structure in which the jaw is opened by touching the tapered section is adopted, the tapered section formed at the upper end of the inner side of the jaw is configured to open the jaw. It was not possible to form a thread in the tapered section because it had to be in contact, and accordingly, a thread was formed only on a part of the inner surface of the jaw except for the upper end, thereby reducing the area of the thread formation of the jaw to be fastened with the thread of the blind bolt, thereby making the jaw stronger the blind bolt. Could not sign. Accordingly, as the blind bolt slides in the process of pulling the blind bolt, there is a problem in that the inner surface of the jaw and the thread of the blind bolt are damaged. On the other hand, in the present invention, the jaws 150 and JAW are divided into four parts 155 so that the protruding portion 111 of the front cap portion 110 comes into contact with the incision groove 156 formed at the top of the jaws 150 and JAW. Since the four parts 155 constituting the surface jaws 150 and JAW slide in the seating groove 172 of the jaw clamper 170, the inner space of the jaws 150 and JAW is widened, so the lower end of the inner surface of the jaw From the top to the top, the threads 154 can be formed as a whole, so that the jaws 150 and JAW can hold the blind bolts 300 strongly. Accordingly, the size of the jaws 150 and JAW can be minimized, and as a result, the overall size of the fastening unit 100 can be minimized.

In the blind bolt fastening unit according to the present invention as described above, the blind bolt fastening unit according to the present invention is formed by dividing the jaw (JAW) into four parts, but forming a tapered portion on the upper left and right of each component constituting the jaw (JAW). Thus, when the four parts are assembled, a plurality of incision grooves are formed on the upper end of the jaw by the tapered parts formed on the respective parts, and at the same time, the protrusions are formed by forming a plurality of protrusions on the front cap coupled to the upper housing The jaw (JAW) is in contact with the incision groove to expand the inner space of the jaw (JAW) so that the blind bolt flows in smoothly, and after the blind bolt flows in, the jaw (JAW) is spaced from the protrusion of the front cap part. As the (JAW) is closed, the blind bolt has an effect capable of being strongly fastened to the jaw (JAW).

Further, when the threads of each of the four parts of the jaw (JAW) are combined, a single helix is formed, and since this single helix is engaged with the thread of the blind bolt, the blind bolt is not damaged without damaging the thread of the blind bolt. Maximized clamping force is exerted between and the jaw.

In addition, as described above, the jaw (JAW) is divided into four parts, and a tapered portion is formed on the upper left and right sides of each of the four parts, so that the protrusion formed in the front cap part contacts the incision groove of the jaw (JAW). By making the four parts constituting each other open, threads can be formed up to the upper end of the inner surface of each of the four parts constituting the jaw so that the blind bolt can be tightened more strongly when the jaw is closed. It has an effect. Specifically, if a taper section is formed at the upper end of the inner side of the jaw and the configuration for opening the jaw is drawn into the inner side of the jaw to contact the taper section so that the jaw is opened, the tapered section formed at the upper end of the inner side of the jaw is used to open the jaw. Since it had to come into contact with the configuration, it was impossible to form a thread in the tapered section, and accordingly, a thread was formed only on a part of the inner surface of the jaw except for the upper end, thereby reducing the area of thread formation of the jaw to be fastened with the thread of the blind bolt, thereby reducing the jaw blind bolt. Could not be concluded strongly. Accordingly, in order to provide sufficient fastening force, the size of the jaw is inevitably increased. On the other hand, in the present invention, when the jaw (JAW) is divided into four parts and the protrusions of the front cap part come into contact with the incision grooves formed at the upper end of the jaw (JAW), the four parts constituting the jaw (JAW) each of the jaw clamper Since the inner space of the jaw opens as the slide moves along the protrusion from the seating groove, the entire thread can be formed from the lower end to the upper end of the jaw, so the jaw can hold the blind bolt strongly. have. Therefore, it is possible to configure the size of the jaw (JAW) small, and eventually the size of the entire fastening unit can be downsized.

In addition, since the snap ring insert is formed at the lower end of each of the parts constituting the jaw, and the parts are assembled while the snap ring is inserted into the snap ring insert, the parts constituting the jaw are shifted in the front-rear direction during the operation of the parts constituting the jaw. It is prevented from being misaligned, so that the thread of the blind bolt fastened to the jaw can be prevented from being damaged.

In addition, after the blind bolt is inserted into the fastening unit, the washer is temporarily fastened with the blind bolt before the jaw is completely closed, and a washer that prevents the blind bolt from separating from the fastening unit is formed of a flexible resin material, By forming a tapered surface on the jaw clamper and the washer fixing ring to securely engage the washer, the space for the washer to flow is secured. It is easy to enter and leave the bolt, and when the blind bolt is inserted into the fastening unit before work and when the blind bolt is removed from the fastening unit after work, there is an effect that the operator can easily work without a great effort.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings. However, since the above-described embodiments are merely described as preferred examples of the present invention, the present invention is limited to the above-described embodiments only. It should not be understood as being, and the scope of rights of the present invention should be understood as the following claims and their equivalent concepts.

100: fastening unit
110: front cap
111: protrusion
112: fastening hole
113: coupler
120: upper housing
130: bottom housing
131: coupling portion
140: Joe holder
141: Taper section
150: Joe (JAW)
151: snap ring
152: upper taper
153: lower taper
154: thread
155: parts
156: incision groove
157: snap ring insert
160: washer
160a: wing
161: Washer fixing ring
161a: Taper side
170: jaw clamper
170a: tapered side
171: protrusion
172: Settling home
173: coupling groove
174: spring
200: power tool
201: Drive shaft
300: blind bolt
301: bolt
302: expanded cylinder
303: flange

Claims (8)

In the blind bolt fastening unit used in combination with a power tool for riveting,
A jaw holder having a space formed inside and positioned inside the upper and lower housings coupled to each other to move back and forth, and having a tapered section at the upper end;
A jaw clamper provided inside the jaw holder and moving forward and backward;
A jaw provided at an upper end of the jaw clamper and moved back and forth by the jaw clamper; And
Includes; a plurality of protrusions for spreading the jaw is formed at regular intervals in the circumferential direction;
The upper end of the jaw is formed in a tapered portion corresponding to the protrusion of the front cap portion,
The jaw is a blind bolt fastening unit characterized in that it consists of a plurality of parts with threads formed on the inside. delete delete delete delete delete delete delete

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