A portable riveting device for riveting with self-tapping blind rivets and a method of control of this device

Abstract

A portable riveting device (1) for drilling and riveting with self-tapping blind rivets (2), comprises a body (3) with a handle (4) with a switch (5) and with a working part (6) and a riveting head (10) for clamping a self-tapping blind rivet (2), housed in the working part (6) of the body (3). The riveting head (10) is capable of coordinated rotary motion for drilling and sliding motion for riveting. The portable riveting device (1) includes a hydraulic drive for the sliding movement of the riveting head (10), an electric drive (7) for the rotary movement of the riveting head (10). The hydraulic drive includes a hydraulic piston (8) connected to a blind hollow rod (29), a hydraulic manifold (11) of hydraulic fluid connected to the hydraulic piston (8), and a source of hydraulic fluid connected to the hydraulic manifold (11).

Description

[0001] A portable riveting device for riveting with self-tapping blind rivets and a method of control of this device

[0002] Field of the Invention

[0003] The present invention relates to a portable riveting device for riveting and a method of control of this device. This device is used in joining materials, in particular sheet metal, which do not have a hole for the rivet to be inserted, even on construction sites.

[0004] Background of the Invention

[0005] Riveting is most often used on construction sites to join two overlapping sheets on walls or roofs. Blind rivets with a mandrel are used when accessing the joint from one side only. After the blind rivet has been inserted in the hole, riveting pliers or riveting machine are used to form the rivet head after pulling the shank during the unriveting process, i.e. expanding the rivet head. The shank is subsequently shortened by breaking off, the breaking off process being now common these days, and it is not necessary to cut off the protruding end with the cutting pliers.

[0006] The existence of a hole in which the rivet is inserted is essential for the rivet to be fitted and the parts to be joined. This hole must therefore be created. While most of the rivets available on the market are made in such a way that a drill with a drill bit must be used in order to create the appropriate hole, there are also self-tapping rivets, e.g. according to document W02020048553A1 or according to document CZ32431U. The shank of this self-tapping rivet is provided with a cutting bit above the head, the rotation of which can create the hole directly when applying the rivet.

[0007] Therefore, a rotary motion of the rivet is required to create the hole. The self-tapping rivet is first clamped in the drill, the hole is drilled, and then the rivet is clamped in the riveting head of the riveting device, inserted in the created hole and the clamping of the rivet in the hole is carried out by unriveting. Subsequently, the excess part of the rivet shank is broken off by reverse movement of the internal chuck of the riveting device. This broken-off part then falls out of the riveting device or is placed in a tray which is part of the riveting device. An example is the device according to document CN101579717B. The riveting head is fitted with a mechanism which, by the use of human power, electrical, hydraulic, pneumatic or other drive, expands the front cylindrical portion of the rivet head and subsequently breaks off the excess part of the shank.

[0008] Manual riveting machines with manual drive are fitted with a coil spring that returns the riveting head to the front position after the shank is broken off, in which the clamping of the pliers is released and the shank falls out, and a new rivet can then be inserted in the riveting head.

[0009] Riveting machines with electric and other drives are known, for example, according to document NZ619140B or US11478844B2. An electrically driven riveting device is often provided with a rechargeable battery, as described, for example, in document US11292049B2 or EP2910321B1. For industrial use, hydraulically or pneumatically driven riveting devices are generally used, where the riveting device needs to be connected to an external source of compressed air or fluid. Examples of such devices are according to documents US20100275438A and W02003076103A1.

[0010] Document W02003076103A1 describes a manual riveting device with external hydraulic drive. The device is provided with two hydraulic motion circuits, with the switching of the circuits being controlled by a manual switching device. In the first phase, the hydraulic fluid is supplied to a hydraulic motor which starts and rotates the riveting head with an inserted selftapping rivet through a gear system. Once the hole has been created and the rivet inserted in the hole, the hydraulic circuit switches to the second drive - piston drive, which performs a straight reverse movement causing the rivet head to unrivet and the excess part of the shank to break off. The main disadvantage of this solution is the need for an external source of hydraulic fluid, which is very space limiting. Another disadvantage is the external installation of the rotary mechanism of the riveting head, which uses a clamping mechanism based on the freewheel principle. Document W02004048012A2 describes a riveting device that is electrically, hydraulically, pneumatically or otherwise driven. The self-tapping riveting device comprises a rotatable head for rotating a self-tapping rivet to form a hole in the parts to be joined. The device further includes a shank retraction assembly for compressing and expanding the hollow body of the self-tapping rivet, allowing the head of the self-tapping rivet to separate from the shank after the predefined tensile force has been applied. The document describes only the general idea of creating a combined drilling and riveting machine but does not provide any guidance principles or description of how to accomplish the creation of this device. Thus, it gives no guidance on how to combine rotary and sliding motion to create a riveting device that is capable of simultaneously and with only one clamping of the self-tapping blind rivet creating a hole in sheet metal for the insertion of the rivet and then performing the process of application of the rivet and riveting process without delay.

[0011] The main object of the patent is to eliminate the shortcomings of devices known from the background of the invention and to create a portable riveting device for riveting with selftapping blind rivets, which will be compact and capable of both the drilling and riveting phases simultaneously. The layout and control of the device should be simple and without the need for any external sources or attachable components. It is also the object of the invention to provide a simple and reliable method of control of the device. The drilling and riveting process should be synchronized and should take place with a single clamping of the self-tapping blind rivet in the riveting head, namely clamping at the beginning of the work with the riveting device. The device should also be capable of eliminating the shortcomings of drilling devices that use a selftapping blind rivet for drilling. The shank of the blind rivet clamped in a standard drilling device is thin. The clamping force and torque exerted on the drilling portion of the blind rivet, which are intended to help better drilling and better formation of the hole, will usually overload and deform the thin shank. This will cause the entire self-tapping blind rivet to be degraded and deformed. Summary of the Invention

[0012] The shortcomings of currently known riveting devices are overcome by the portable riveting device described below, which serves simultaneously both for drilling a hole with a self-cutting blind rivet and for the subsequent operation of riveting with this rivet. Both operations are performed simultaneously in a series of simultaneous operations, in a single operation of inserting and clamping the self-tapping blind rivet into the riveting head.

[0013] The portable riveting device consists of two main parts, which are the body and the riveting head, which are connected to each other by means of a thread to form one compact unit. When viewed externally, the body is divided into several shape-definable parts. These parts are the working part and the handle, the handle being equipped with a switch. The handle itself is divided into a grip part, which serves for holding the portable riveting device in the hand, and a source part. The riveting head is used for clamping the self-tapping blind rivet and then it must create a hole for the self-tapping blind rivet by rotary movement and then apply the body of the blind rivet directly into the joint by making a straight horizontal movement. All operations take place gradually and concurrently. Inside the body there is a drive for sliding movement of the riveting head, a blind hollow rod connected with one end to the riveting head and with the other end to the drive for sliding movement of the riveting head. A hollow tube is arranged in the blind hollow rod to take the separated shank from the blind rivet away from the portable riveting device or into the magazine for shanks. Inside the body there is also a drive for rotary movement of the riveting head. Both the drive for sliding movement of the riveting head and the drive for rotary movement of the riveting head are connected to an electrical control circuit which is connected to a switch. The handle is connected to the working part, where in the upper part of the handle there is the grip part, which is smoothly connected to the source part from below.

[0014] In the preferred embodiment, the sliding motion of the riveting head is driven by a hydraulic drive. The hydraulic drive comprises a hydraulic piston connected to the blind hollow rod, and a hydraulic manifold of hydraulic fluid connected to the hydraulic piston. The hydraulic drive also includes a source of hydraulic fluid connected to the hydraulic manifold. The hydraulic piston, the hydraulic manifold and the source of hydraulic fluid are arranged in a body. The hydraulic manifold and / or the source of hydraulic fluid is connected to a switch.

[0015] In another preferred embodiment, the rotary motion of the riveting head is driven by an electric drive.

[0016] In another preferred embodiment, the hydraulic piston is a double-acting piston and is located inside the working part. The hydraulic manifold is then connected to both the first chamber and the second chamber of the hydraulic cylinder, with the first chamber being the chamber below the hydraulic piston and the second chamber being the chamber above the hydraulic piston. The source of hydraulic fluid is an electrically driven reversible pump located in the source part of the handle, the one outlet of which is connected to the first chamber and the other outlet is connected to the second chamber, so that it substantially pumps the hydraulic fluid between the chambers. The reversible pump is connected to a power source which is also arranged in the source part of the handle. The electrically driven reversible pump and / or the power source is connected to a switch.

[0017] In another preferred embodiment, the hydraulic piston is a single-acting piston and is arranged in the working part. Thus, the hydraulic manifold is connected to a single chamber of the hydraulic cylinder below the hydraulic piston. In this preferred embodiment, the source of hydraulic fluid is an electrically driven pump connected to the hydraulic fluid reservoir. Both the pump and the reservoir are arranged in the source part of the handle. The pump is connected to the power source which is also arranged in the source part of the handle. The electrically driven pump and / or power source is connected to a switch.

[0018] In a further preferred embodiment, the electric drive of the rotary movement of the riveting head is connected to a power source arranged in the source part of the handle and to a switch arranged in the grip part of the handle.

[0019] In another preferred embodiment, the constructional arrangement of the riveting head is that the rotary movement is performed by the entire riveting head including the outer sleeve which is arranged in an electric drive in its outer rear part and is fitted with a riveting tip in its front part. The riveting head further comprises a carrier which is anchored to the blind hollow rod and an inner hollow chuck which is anchored to the carrier. The chuck has an inner conical surface at the front which is fitted with sliding taper bolts. The taper bolts are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone. The taper bolts are used for clamping the shank of the blind rivet.

[0020] In a further preferred embodiment, the portable riveting device includes an electrical control circuit arranged in the grip part of the handle and connected to the switch and to both the hydraulic drive of the sliding movement of the riveting head and the electrical drive of the rotary movement of the riveting head. The electrical control circuit thus serves to control the hydraulic drive and the electrical drive simultaneously by means of a single common switch.

[0021] In another preferred embodiment, the electric drive for the rotary movement of the riveting head consists of an electric motor with a pinion, gears and a driven gear. The driven gear is arranged on a hollow splined shaft on which the outer sleeve of the riveting head is mounted by means of threaded fastener.

[0022] In a further preferred embodiment, the hollow tube is securely mounted in a blind hollow rod, and this is mounted with its rear part in the hydraulic piston. The front part of the blind hollow rod is arranged in a rotatable riveting head.

[0023] In a further preferred embodiment, the free front end of the hollow tube is fitted with a hollow thrust element at the front end protruding from the blind hollow rod into the cavity of the inner chuck. A recoil spring is arranged between the rear annular part of the thrust element and the front profile of the blind hollow rod.

[0024] The portable riveting device overcomes the background of the invention in that it is portable as a whole and does not require any additional power source, device or jig to operate. Above all, it enables a single riveting head to perform both hole drilling and riveting simultaneously, in a single process of inserting the blind rivet in the riveting head, i.e. in a single clamping operation. Both the rotary and sliding movements are synchronized and take place in one complete step sequence, where the blind rivet is inserted in the riveting head only once at the start of the entire drilling and riveting process. In addition, control of the entire portable riveting device is simple, by means of a single two-position switch. This also makes the method of control of the portable riveting device designed according to the present application different. In order to start work, the portable riveting device is in position one, with the blind hollow rod displaced in its front extreme position. The working procedure of the portable riveting device is such that, in position one, a blind rivet is inserted in the riveting head through the riveting bushing so that the shank of the blind rivet is inserted with its rear end between the taper bolts. The blind hollow rod is displaced in its front extreme position. A switch is then pressed to instruct the electrical control circuit to perform a short actuation of the sliding motion of the riveting head. This causes the blind hollow rod to move backwards, thus pre-loading the blind rivet. Pre-loading means that by pushing the shank further into the head, the body of the blind rivet fits more tightly to the drilling part of the blind rivet. The pre-loading pressure thus exerted creates a sufficiently strong contact between the drilling part of the blind rivet and the body of the blind rivet to allow the transmission of the rotational force from the portable riveting device to the drilling part, both by the shank itself and by the body of the blind rivet. By pushing the blind hollow rod backwards, the inner chuck is clamped at the same time, thus clamping the taper bolts between its inner conical surfaces, which in turn clamp the shank of the blind rivet firmly. At the end of this phase, the backward movement is terminated, and the blind rivet and the portable riveting device are ready for the drilling phase. Subsequently, the electrical control circuit actuates the drive of the rotary motion of the drilling head and the drilling of the blind rivet hole is carried out. The drive of the rotary motion of the drilling head is then stopped and the drilling operation is terminated. In the next step, when the switch is pressed, the electrical control circuit actuates the drive of the sliding motion of the riveting head, which moves the blind hollow rod backwards. The induced reverse thrust causes the shank to retract further into the portable riveting device, whereby the body of the blind rivet is exposed to thrust of the shank to the extent that the body of the blind rivet expands and the shank is subsequently broken off. At this point the backward movement stops and the riveting process is complete. The electrical control circuit then performs reverse actuation of the drive of the sliding motion of the riveting head, causing the blind hollow rod to move back to its front position, i.e. position one. The drive is then switched off.

[0025] In the preferred embodiment, after inserting the blind rivet in the blind head, a switch is pressed which instructs the electrical control circuit to perform a short actuation of the reversible pump which pumps a portion of the hydraulic fluid into the second chamber, i.e. above the hydraulic piston. As a result, the hydraulic piston and the blind hollow rod are moved backwards and the blind rivet is pre-loaded. Consequently, this also causes the blind hollow rod to move backwards, thereby clamping the inner chuck, which in turn clamps the taper bolts between its conical surfaces. These then clamp the shank of the blind rivet firmly. Due to the shape of the inner teeth of the taper bolts, the clamped shank cannot make sliding or rotary movement inside the clamp. In this way, the rivet is brought to the drilling position and the backward movement is stopped for now. Subsequently, electric current is passed to the electric motor, which is started and rotates the hollow splined shaft through the pinion, gears and driven gear, and thereby sets the riveting head in rotary drilling motion. The hole for the blind rivet is then drilled and the rotary motion is stopped when the hole is drilled. After drilling the hole for the blind rivet, a quick double press of the switch is followed by the electrical control circuit starting the reversible pump at full speed, which pumps the remaining hydraulic fluid from the first chamber into the second chamber, above the hydraulic piston. The hydraulic piston is thus moved backwards together with the blind hollow rod with carrier and taper bolts. This reverse thrust causes the shank to retract more into the portable riveting device and the body of the blind rivet to expand. Subsequently, the shank is broken off, thus the riveting is complete and the portable riveting device is in position two where the reverse movement is complete. Subsequently, by lifting the riveting head from the horizontal to the vertical position, the separated part of the shank falls out of the portable riveting device or into the magazine for shanks through the hollow tube. The final step is that the reversible pump is switched on and all hydraulic fluid is pumped from the second chamber into the first chamber, and the portable riveting device returns to position one, where it is ready for new insertion of the blind rivet.

[0026] The main advantage of the present solution is that the portable riveting device for riveting with self-tapping blind rivets is made as a single tool that is fully compact and capable of both the drilling phase and the riveting phase. Both of these phases are synchronous and carried out gradually without any manipulation of the self-tapping blind rivet, i.e. they are carried out only in a single clamping of the self-tapping blind rivet in the riveting head. It is inserted into the riveting head only once, at the beginning of the riveting process. The developed portable riveting device has a simple, compact arrangement and is easy to operate. The portable riveting device does not require any additional external source or attachable components to operate. The portable riveting device also has a simple and reliable method of control. One of the main advantages is that the riveting device will pre-load the self-tapping blind rivet in the riveting head before starting the drilling phase. The pre-loading creates a firm contact between the drilling part of the blind rivet and the body of the blind rivet, where the rotational power from the portable riveting device is transmitted to the drilling part by both the shank and the body of the blind rivet. This prevents the shank from being overloaded and deformed by overloading. All advantages have been confirmed and tested physically on more than one million drilling and riveting operations with a self-tapping blind rivet.

[0027] Explanation of drawings

[0028] The invention will be explained in detail by drawings which illustrate:

[0029] Fig. 1 side view of a portable riveting device in position before starting the riveting process,

[0030] Fig. 2 side view of the front detail of a portable riveting device, especially the electric drive and the riveting head in position before starting the riveting process,

[0031] Fig. 3 side view of a portable riveting device in position after completion of the riveting process after the shank has been broken off,

[0032] Fig. 4 enlarged side view of the lower part of the riveting device without packaging showing the switch, electrical control circuit, hydraulic manifold, reversible pump and part of the power source. These parts are housed in the handle as standard,

[0033] Fig. 5 detailed view of the shape of the teeth of the taper bolt,

[0034] Fig. 6 side view of the shape of the set of teeth of the taper bolt, Fig. 7 front view of the shape of the set of teeth of the taper bolt. Examples of the invention embodiments

[0035] The portable riveting device 1, as illustrated in Figs. 1 to 5, is based on the concept of the background of the invention of known riveting devices, while significantly improving these devices. In particular, the essence of the invention is the combination of the ability of the riveting head 10 to perform both rotary drilling movement and sliding pulling movement. The rotary motion is achieved by means of the electric drive 7, while the sliding motion, which requires much greater force, is achieved by means of the hydraulic drive. Both of these drives are part of a single device which does not require any external element to operate. In addition, the shape of the teeth of the taper bolts 22 completely eliminates the rotation or displacement between the taper bolts 22 of the clamped shank 23 of the blind rivet 2.

[0036] The portable riveting device 1 generally comprises a body 3, a riveting head 10, a hydraulic drive, a blind hollow rod 29 and an electric drive 7. The body 3 comprises a handle 4 with a switch 5 and a working part 6. The riveting head 10 is used for clamping the self-tapping blind rivet 2 and is housed in the working part 6 of the body 3. The riveting head 10 has the possibility of rotary motion for drilling and sliding motion for riveting. The blind hollow rod 29 is connected at one end to the riveting head 10 and at the other end to the hydraulic drive of the sliding movement of the riveting head 10. A hollow tube 9 is arranged in the blind hollow rod 29 for removing the separated shank 23 of the blind rivet 2 from the portable riveting device 1 or into the magazine 34 for shanks 23. The hydraulic drive includes a hydraulic piston 8 connected to the blind hollow rod 29, a hydraulic manifold 11 of hydraulic fluid connected to the hydraulic piston 8, and a source of hydraulic fluid connected to the hydraulic manifold 11. The hydraulic piston 8, the hydraulic manifold 11 and the source of hydraulic fluid are arranged in the body 3. The hydraulic manifold 11 and / or the source of hydraulic fluid is connected to the switch 5. The purpose of the riveting head 10 is to clamp the self-tapping blind rivet 2 and then, by rotating it, to create a hole in the material to be joined for the insertion of this blind rivet 2. Subsequently, the riveting head 10 also enables the application of the body 33 of the blind rivet 2 to the joint by means of the straight horizontal movement well known from the background of the invention. The handle 4 is connected to the working part 6, where the upper part of the handle 4 is a thinner grip part 36 which is smoothly connected to a wider source part 37 from below. The thinner grip part 36 is used for holding the portable riveting device 1 in the hand.

[0037] Example 1:

[0038] In this particular example of embodiment, the body 3 and the riveting head 10 are detachably j oined by means of a thread into a single compact unit. In this particular example of embodiment of the invention, the hydraulic piston 8 is a double-acting piston and the source of hydraulic fluid is a reversible pump 12 connected to the hydraulic manifold 11. The hydraulic piston 8, the hydraulic manifold 11 and the reversible pump 12 are arranged in the body 3 and the hydraulic manifold 11 and / or the source of hydraulic fluid is connected to the switch 5. In this example of embodiment of the invention, the hydraulic manifold 11 is connected to both the first chamber 13 and the second chamber 14 of the hydraulic cylinder 15, where the first chamber 13 is the chamber below the hydraulic piston 8 and the second chamber 14 is the chamber above the hydraulic piston 8. The electrically driven reversible pump 12 is in the source part 37 of the handle 4. The reversible pump 12 with its first outlet is connected through the hydraulic manifold 11 to the first chamber 13 of the hydraulic piston 8 and with its second outlet to the second chamber 14 of the hydraulic piston 8, so that the reversible pump 12 pumps hydraulic fluid directly between the chambers 13, 14. The reversible pump 12 is connected to the power source 16, which is also arranged in the source part 37 of the handle 4. The electrically driven reversible pump 12 and / or the power source 16 is connected to a switch 5.

[0039] In this example of embodiment of the invention, the electric drive 7 of the rotary motion of the riveting head 10 is connected to the power source 16 arranged in the source part 37 of the handle 4 and to a switch 5 arranged in the grip part 36 of the handle 4. The portable riveting device 1 also includes an electrical control circuit 18 arranged in the grip part 36 of the handle 4 and connected to the switch 5 as well as to the reversible pump 12 for the sliding motion of the riveting head 10. The electrical control circuit 18 is also connected to the electric motor 24. Thus, the electrical control circuit 18 serves to simultaneously control the reversible pump 12 and the electric drive by means of a single switch 5. The constructional arrangement of the riveting head 10 is that the rotary motion is performed by the entire riveting head 10, including the outer sleeve 19 which is arranged with its outer rear part in an electric drive and fitted with a riveting tip 20 in its front part. The riveting head 10 further includes a carrier 35 which is anchored to the blind hollow rod 29, and an inner chuck 21 of hollow shape which is anchored to the carrier 35. The inner chuck 21 has an inner conical surface at the front which is fitted with sliding taper bolts 22. The taper bolts 22 are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone. The taper bolts 22 serve to clamp the shank 23 of the blind rivet 2. In this particular example of embodiment of the inventions, the electric drive for the rotary motion of the riveting head 10 consists of an electric motor 24 with a pinion 25, gears 26 and a driven gear 27. The driven gear 27 is arranged on a hollow splined shaft 29, in which the outer sleeve 19 of the riveting head 10 is mounted by means of a threaded fastener. The hollow tube 9 is also mounted in the blind hollow rod 29, and this is mounted with its rear part in the hydraulic piston 8. The front part of the blind hollow rod 29 is arranged in a rotatable riveting head 10. The free front end of the hollow tube 9 protruding from the blind hollow rod 29 into the cavity of the inner chuck 21 is fitted with a hollow thrust element 30. A recoil spring 17 is arranged between the rear annular part 31 of the thrust element 30 and the front profile 32 of the blind hollow rod 29.

[0040] Non- illustrated example - Example 2:

[0041] The portable riveting device 1 according to this non-illustrated example of embodiment of the invention is based on the design of the portable riveting device 1 according to Example 1. The main difference is that the hydraulic piston 8 is a single-acting piston and is arranged in the working part 6. Thus, the hydraulic manifold 11 is connected to a single chamber of the hydraulic cylinder 15 below the hydraulic piston 8. The source of hydraulic fluid in this example of embodiment is an electrically driven pump connected to a hydraulic fluid reservoir. Both the pump and the reservoir are arranged in the source part 37 of the handle 4. The pump is connected to the power source 16, which is also arranged in the source part 37 of the handle 4. The electrically driven pump and / or the power source 16 is connected to the switch 5, but the switch 5 is not connected to the electrical control circuit 18, which is not part of the portable riveting device 1. The handling of the portable riveting device 1 is very easy and does not require the use of any additional devices or jigs, except for the self-tapping blind rivets 2, which are not included in the portable riveting device 1. The actual operation of the portable riveting device 1 can be viewed on the applicant’s web link ft .Mx,as. The handling of the portable riveting device 1 is as follows. The operator grasps the portable riveting device 1 in one hand by its grip part 36. The position of the riveting device 1 for starting work is self-setting and is referred to as position one. In this position, the hydraulic fluid is pumped in the first chamber 13 so that the hydraulic piston 8 is displaced in its front extreme position. The blind hollow rod 29 is thus also displaced in its front extreme position, where it presses on the inner chuck 21, which is thus expanded and a gap is created between the taper bolts 22 for the insertion of the shank 23 of the blind rivet 2. The operator inserts the shank 23 of the blind rivet 2 through the riveting tip 20 between the taper bolts 22, with the body 33 of the blind rivet 2 protruding from the portable riveting device 1. Subsequently, the operator presses with his / her finger the switch 5 on the grip part 36; this press is only a simple press. Pressing the switch 5 instructs the electrical control circuit 18 to perform a short actuation of the reversible pump 12, which pumps a portion of the hydraulic fluid into the second chamber 14, i.e. into the space above the hydraulic piston 8. The hydraulic piston 8, together with the blind hollow rod 29, moves backwards and the blind rivet 2 is pre-loaded, i.e. the body 33 is pressed tightly against the drilling part 38 of the blind rivet 2. Moving the blind hollow rod 29 backwards clamps the inner chuck 21, which thereby clamps the taper bolts 22 between its conical surfaces. The taper bolts 22 firmly clamp the shank 23 of the blind rivet 2 and, because the taper bolts 22 are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone, the clamping of the shank 23 of the blind rivet 2 is firm. The shank 23 is thus fully secured against both unintended rotation and displacement into or out of the portable riveting device 1. At this point, the blind rivet 2 is in the drilling position. Subsequently, electric current is passed to the electric motor 24, which is started and rotates the hollow splined shaft 28 through the pinion 25, the gears 26 and the driven gear 27. The hollow splined shaft 28 sets the riveting head 10 in rotary drilling motion. The hole for the blind rivet 2 is then drilled. After drilling the hole, the operator of the portable riveting device 1 executes a quick double press of the switch 5. This double press sends an instruction to the electrical control circuit 18, which starts the reversible pump 12 at full speed. Subsequently, the reversible pump 12 pumps the remaining hydraulic fluid from the first chamber 13 into the second chamber 14, i.e. into the space above the hydraulic piston 8. The hydraulic piston 8 is then moved fully backwards together with the blind hollow rod 29 with the carrier 35 and the taper bolts 22. This reverse thrust first causes the shank 23 to retract more into the portable riveting device 1 and the body 33 of the blind rivet 1 to expand, and then the shank 23 is broken off. At this point, the riveting process is completed and the operation of taking the portable riveting device 1, from this position, which is called position two, back to position one follows. This is done by the operator lifting the portable riveting device 1 from the horizontal position to the vertical position by simply lifting the riveting tip 20 upwards. After this lifting, the separated part of the shank 23 falls out of the portable riveting device 1 or into the magazine 34 for shanks 23 through the hollow tube 9. At the same time, the reversible pump 12 is automatically switched on and all the hydraulic fluid is pumped from the second chamber 14 into the first chamber 13 and the portable riveting device 1 is thus set to position one, where the portable riveting device 1 is ready for the insertion of the new blind rivet 2.

[0042] Industrial applicability

[0043] The invention finds its application in the construction and engineering industry in joining materials, in particular sheet metal, which do not have a hole for the rivet to be inserted, even on construction sites.

[0044] List of index reference numerals

[0045] 1 portable riveting device

[0046] 2 blind rivet

[0047] 3 body

[0048] 4 handle

[0049] 5 switch

[0050] 6 working part

[0051] 7 electric drive

[0052] 8 hydraulic piston

[0053] 9 hollow tube

[0054] 10 riveting head

[0055] 11 hydraulic manifold

[0056] 12 reversible pump

[0057] 13 first chamber

[0058] 14 second chamber

[0059] 15 hydraulic cylinder

[0060] 16 power source

[0061] 17 recoil spring

[0062] 18 electrical control circuit

[0063] 19 outer sleeve

[0064] 20 riveting tip

[0065] 21 inner chuck

[0066] 22 taper bolts

[0067] 23 shank of blind rivet

[0068] 24 electric motor

[0069] 25 pinion

[0070] 26 gear

[0071] 27 driven gear

[0072] 28 hollow splined shaft blind hollow rod thrust element rear annular part of the thrust element front profile of the guide sleeve rivet body magazine carrier grip part source part drilling part of the blind rivet

Claims

CLAIMS1. A portable riveting device (1) for drilling and riveting with self-tapping blind rivets (2), comprising a body (3) with a handle (4) with a switch (5) and with a working part (6), a riveting head (10) for clamping the self-tapping blind rivet (2), mounted in the working part (6) of the body (3), a drive for sliding movement of the riveting head (10), a blind hollow rod (29) connected at one end to the riveting head (10) and at the other end to the drive for sliding movement of the riveting head (10), and a hollow tube (9) arranged therein for removing the separated shank (23) of the blind rivet (2), and a drive for rotary movement of the riveting head (10), characterized in that it further comprises a control electrical circuit (18) interconnected with the drive for sliding movement of the riveting head (10) and the drive for rotary movement of the riveting head (10), for their synchronization in drilling and riveting with a single clamping of the self-tapping blind rivet (2) in the riveting head (10).

2. The portable riveting device (1) according to claim 1, characterized in that the drive for the sliding movement of the riveting head (10) is a hydraulic drive, which comprises a hydraulic piston (8) connected to the blind hollow rod (29), a hydraulic manifold (11) of hydraulic fluid connected to the hydraulic piston (8) and a source of hydraulic fluid connected to the hydraulic manifold (11), where the hydraulic piston (8), the hydraulic manifold (11) and the source of hydraulic fluid are arranged in the body (3) and the hydraulic manifold (11) and / or the source of hydraulic fluid is connected to the switch (5).

3. The portable riveting device (1) according to claim 1, characterized in that the drive for the rotary movement of the riveting head (10) is the electric drive (7).

4. The portable riveting device (1) according to claim 1, characterized in that the handle (4) is divided into the upper grip part (36) which is connected to the working part (6) and the lower source part (37) which is smoothly connected to the grip part (36).

5. The portable riveting device according to claims 1 to 4, characterized in that the hydraulic piston (8) is the double-acting piston and is arranged in the working part (6), the hydraulic manifold (11) is connected to the first chamber (13) and the second chamber (14) of the hydraulic cylinder (15) above and below the hydraulic piston (8), and the source of hydraulic fluid is the electrically driven reversible pump (12) arranged in the source part (37) of the handle (4) connected to the power source (16), which is also arranged in the source part (37) of the handle (4), where the electrically driven reversible pump (12) and / or the power source (16) is connected to the switch (5).

6. The portable riveting device according to claims 1 to 4, characterized in that the hydraulic piston (8) is the single-acting piston, is arranged in the working part (6), the hydraulic manifold (11) is connected to a single chamber of the hydraulic cylinder (15) below the hydraulic piston (8), and the source of hydraulic fluid is the electrically driven pump connected to the hydraulic fluid reservoir, where both the pump and the reservoir are arranged in the source part (37) of the handle (4), and to the power source (16), which is also arranged in the source part (37) of the handle (4), where the electrically driven pump and / or the power source (16) is connected to the switch (5).

7. The portable riveting device according to any of claims 1 to 6, characterized in that the electric drive (7) of the rotary movement of the riveting head (10) is connected to the power source (16) arranged in the source part (37) of the handle (4) and to the switch (5) arranged in the grip part (36) of the handle (4).

8. The portable riveting device according to any of claims 1 to 7, characterized in that the electrical control circuit (18) is arranged in the grip part (36) of the handle (4) and is connected to the switch (5) and at the same time to the hydraulic drive of the sliding movement of the riveting head (10) and to the electric drive (7) of the rotary movement of the riveting head (10), for simultaneous control of the hydraulic drive and the electric drive (7) by means of a single common switch (5).

9. The portable riveting device according to any of claims 1 to 8, characterized in that the riveting head (10) is rotatable and comprises the carrier (35) anchored to the blind hollow shank (29) and the internal chuck (21) with the internal conical surface provided with sliding taper bolts (22) for clamping the shank (23) of the rivet (2), where the taper bolts (22) are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone.

10. The portable riveting device according to any of claims 1 to 9, characterized in that the electric drive (7) for the rotary movement of the riveting head (10) comprises an electric motor (24) with the pinion (25), the gears (26) and the driven gear (27) arranged on the hollow splined shaft (28) in which the outer sleeve (19) of the riveting head (10) is arranged with a threaded joint.

11. The portable riveting device according to any of claims 1 to 10, characterized in that the hollow tube (9) is securely mounted in the blind hollow rod (29) which is is mounted with its rear part in the hydraulic piston (8) arranged in the working part (6), where the front part of the blind hollow rod (29) is arranged in the rotatable riveting head (10).

12. A method of control of a portable riveting device according to any of claims 1 to 11, characterized in that it comprises the following consecutive steps: a) first, the blind rivet (2) is inserted in the riveting head (10) through the riveting bushing (20), while the rear part of the shank (23) of the blind rivet (2) is inserted between the taper bolts (22), b) in the subsequent step, the electrical control circuit (18) actuates the drive of the sliding movement of the riveting head (10), which moves the blind hollow rod (29) backwards, while pre-loading the blind rivet (2) so that the body (33) of the blind rivet (2) fits tightly to the drilling part (38) of the blind rivet (2), where the pre-loading pressure forms a permanent joint between the drilling part (38) of the blind rivet (2) and the body (33) of the blind rivet (2), with the rotational force from the portable riveting device beingtransmitted to the drilling part (38) by both the shank (23) and the body (33) of the blind rivet (2), c) this simultaneously moves the blind hollow rod (29) backwards and thus clamps the inner chuck (21), which thus clamps the taper bolts (22) between its inner conical surfaces, which thus firmly clamp the shank (23) of the blind rivet (2) and thus prepare the blind rivet (2) in position for drilling, d) in this position the drive of the sliding movement of the riveting head (10) and the displacement of the blind hollow rod (29) stop, e) subsequently, the electrical control circuit (18) starts the drive of the rotary movement of the drilling head (10) and then drills the hole for the blind rivet (2), f) in the next step, the drive of the rotary movement of the drilling head (10) is stopped, thus ending the drilling process, g) subsequently, the electrical control circuit (18) starts the drive of the sliding movement of the riveting head (10), which moves the blind hollow rod (29) backwards, h) this reverse thrust causes the shank (23) to retract more into the portable riveting device (1), thereby expanding the body (33) of the blind rivet (2) and subsequently breaking off the shank (23), thus completing the riveting process and ending the reverse movement, i) subsequently, the electrical control circuit (18) actuates the drive of the rotary motion of the riveting head (10) and the drive of the sliding movement of the riveting head (10) moves the blind hollow rod (29) back to its front position, and then the drive is switched off13. A method of control of a portable riveting device according to claim 12, characterized in that it comprises the following consecutive steps: j) first, the blind rivet (2) is inserted in the riveting head through the riveting bushing (20), while the rear part of the shank (23) of the blind rivet (2) is inserted between the taper bolts (22), k) in the subsequent step, the switch (5) is pressed, which instructs the electrical control circuit (18) to start the reversible pump (12), which pumps the hydraulic fluid into thesecond chamber (14) above the hydraulic piston (8), which is moved backwards to preload the blind rivet (2), l) this moves the blind hollow rod (29) backwards and thus clamps the inner chuck (21), which thus clamps the taper bolts (22) between its inner conical surfaces, which thus firmly clamp the shank (23) of the blind rivet (2) and thus prepare the blind rivet (2) in position for drilling, m) subsequently, the sliding movement is terminated and the blind hollow rod (29) remains fixed in this achieved position, n) subsequently, electric current is passed to the electric motor (24), which is started and rotates the hollow splined shaft (28) through the pinion (25), the gears (26) and the driven gear (27), thereby setting the riveting head (10) in rotary drilling motion, o) subsequently, the hole for the blind rivet (2) is drilled, with the riveting head (10) transmitting the rotational force to the drilling part (38) of the blind rivet (2) through the shank (23) and the body (33) of the blind rivet (2), p) after drilling the hole for the blind rivet (2), the electrical connection is disconnected and the rotary motion is terminated by q) a quick double press of the switch (5), whereupon the electrical control circuit (18) starts the reversible pump (12) which pumps the remaining hydraulic fluid from the first chamber (13) into the second chamber (14) above the hydraulic piston (8), the hydraulic piston (8) moves backwards together with the blind hollow rod (29), the carrier (35), and the taper bolts (22), r) this reverse thrust causes the shank (23) to retract more into the portable riveting device (1), thereby expanding the body (33) of the blind rivet (2) and subsequently breaking off the shank (23), thus completing the riveting process, s) subsequent lifting of the riveting head (10) from the horizontal to the vertical position causes the separated part of the shank (23) to fall out of the portable riveting device (1) or into the magazine (34) for shanks (23) through the hollow tube (9), t) the reversible pump (12) pumps all hydraulic fluid from the second chamber (14) into the first chamber (13), so that the hydraulic piston (8) moves fully forward to the original position of readiness of the portable riveting device (1) for new operation.

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