A portable riveting device for riveting with self-tapping blind rivets

Abstract

A portable riveting device (1) for drilling and riveting with self-tapping blind rivets (34) comprises a body (3) with a handle (4) with a switch (5) with a working part (6) and a source part (24), a riveting head (7), a drive for sliding movement and a drive for rotary movement of the riveting head (7), a blind hollow rod (8) and a hollow tube (9). The blind hollow rod (8) is connected at one end to the riveting head (7) and at the other end to the drive for sliding movement of the riveting head (7). The portable riveting device (1) further comprises an electrical control circuit (10) connected to the drives for sliding movement and rotary movements of the riveting head (7), for their synchronization in drilling and riveting with a single clamping of the self-tapping blind rivet (34) in the riveting head (7).

Description

[0001] A portable riveting device for riveting with self-tapping blind rivets

[0002] Field of the Invention

[0003] The present invention relates to a portable riveting device for riveting with self-tapping blind rivets, which are used for joining materials, in particular sheet metal, which do not have a preformed hole for the insertion of the rivet, 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 EP2910321B 1. 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.

[0011] 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.

[0012] 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.

[0013] Summary of the Invention

[0014] 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-tapping 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.

[0015] 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 riveting 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 a 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.

[0016] In the preferred embodiment, a single central electric motor drives the sliding movement of the riveting head and the rotary movement of the riveting head at the same time. This central electric motor is fitted with an output shaft that is double-sided or connected to a double-sided drive shaft. This arrangement allows the torque to be supplied from both sides of the central electric motor. A double-sided output shaft or double-sided drive shaft is connected to at least one mechanical clutch and at least one mechanical gearbox. The electrical control circuit is then connected to a mechanical clutch and / or mechanical gearbox to synchronize their switching into a fixed connection with the central electric motor. One side of the output shaft in the double-sided version or one side of the double-sided drive shaft is connected to the first mechanical clutch, which is connected by a gear with a ball screw. The ball screw is then connected to the blind hollow rod and sets it in a linear horizontal motion in the axis of pulling the self-tapping blind rivet. The other side of the output shaft in the double-sided version or the other side of the double-sided drive shaft is connected to the second mechanical clutch, which is equipped with a mechanical gearbox. The mechanical gearbox is then connected via gears to the riveting head and sets it in rotary motion.

[0017] In another preferred embodiment, the first electric motor drives the sliding movement of the riveting head and the second electric motor drives the rotary movement of the riveting head. The second electric motor is connected to a mechanical gearbox, which is connected via gears to the riveting head. The second electric motor thus transmits the rotary motion to the riveting head and enables it to perform the process of drilling a hole with a self-tapping blind rivet. The first electric motor is connected by means of a gear with a ball screw, which is connected to a blind hollow rod. The first electric motor thus sets the blind hollow rod in a linear horizontal motion in the axis of pulling the self-tapping blind rivet, thereby enabling the self-tapping blind rivet to be pre-loaded in the first phase and then in the third phase the rivet itself to be expanded and the shank to be torn off. The second phase is the drilling phase.

[0018] In another preferred embodiment, the first electric motor again drives the sliding movement of the riveting head and the second electric motor again drives the rotary movement of the riveting head. In this preferred embodiment, the second electric motor is connected to a mechanical gearbox, which is then connected via gears to the riveting head. The second electric motor thus transmits the rotary motion to the riveting head and enables it to perform the process of drilling a hole with a self-tapping blind rivet in the second working phase of the portable riveting device. The first electric motor is connected to a mechanical gearbox, which is fitted with a horizontally rotating cam with a lobe at its output. The cam lobe is arranged in a bracket which is connected to the blind hollow rod. By rotating the cam with the lobe around the vertical axis, the cam lobe moves the bracket in the horizontal direction. The first electric motor thus sets the blind hollow rod in a linear horizontal motion in the axis of pulling the self-tapping blind rivet, thereby enabling the self-tapping blind rivet to be pre-loaded in the first phase and then in the third phase the rivet itself to be expanded and the shank to be tom off. In the next preferred embodiment, the first electric motor again drives the sliding movement of the riveting head and the second electric motor again drives the rotary movement of the riveting head. In this preferred embodiment, the second electric motor is connected to the riveting head by means of gears. The second electric motor thus transmits the rotary motion to the riveting head and enables it to perform the process of drilling a hole with a self-tapping blind rivet in the second working phase of the portable riveting device. The first electric motor is then connected to a mechanical gearbox, which is fitted with a ball screw at its output. The ball screw is fitted with a vertically moving bracket with an inclined groove at the end opposite the connection to the gearbox. In this preferred embodiment, the blind hollow rod is fitted with a pin arranged in an inclined groove at its rear. The up and down movement of the bracket thus sets the pin in a linear horizontal motion in the axis of pulling the self-tapping blind rivet, thereby enabling the self-tapping blind rivet to be pre-loaded in the first phase and then in the third phase the rivet to be expanded and the shank to be torn off.

[0019] In another preferred embodiment, a hydraulic pump drives both sliding movement of the riveting head and rotary movement of the riveting head. In this preferred embodiment, this hydraulic pump is arranged in the source part and is provided with a hydraulic line fitted with a valve. The valve is connected to the electrical control circuit that controls the opening of the valve. The drive for the rotary movement of the riveting head includes a hydraulic motor arranged in the working part and connected to the first branch of the valve outlet. The drive for sliding movement of the riveting head includes a hydraulic piston which is connected to the second branch and the third branch of the valve outlet. In the most preferred embodiment, the hydraulic pump is a gear pump driven by a third electric motor. In the same preferred embodiment, the hydraulic piston is a double-acting hydraulic piston, one chamber of which is connected to the second branch of the valve outlet and the second chamber of which is connected to the third branch of the valve outlet, therefore the gradual opening of branches moves the piston in a horizontal plane. The double-acting hydraulic piston is connected to the blind hollow rod and sets it in a linear horizontal motion in the axis of pulling the self-tapping blind rivet, thereby enabling the self-tapping blind rivet to be pre-loaded in the first phase and then in the third phase the rivet to be expanded and the shank to be torn off. The hydraulic motor is connected to the riveting head with its output of rotary motion through gears, thus transmitting the rotary motion to the riveting head and enabling it to perform the process of drilling a hole with a self-tapping blind rivet in the second working phase of the portable riveting device.

[0020] In another preferred embodiment, the first electric motor drives the sliding movement of the riveting head and the second electric motor drives the rotary movement of the riveting head. The second electric motor is connected to the riveting head through gears and enables it to perform the process of drilling a hole with a self-tapping blind rivet in the second working phase of the portable riveting device. The first electric motor is connected to a mechanical gearbox, which is fitted with a ball screw at its output. The ball screw is fitted with a hydraulic piston at the end opposite the gearbox connection, which is arranged in the first hydraulic chamber. The first hydraulic chamber is then connected by channels to the second hydraulic chamber, which is also fitted with a hydraulic piston. However, this is attached to the blind hollow rod. The first electric motor thus sets, by means of hydraulic power transmission, the blind hollow rod in a linear horizontal motion in the axis of pulling the self-tapping blind rivet, thereby enabling the self-tapping blind rivet to be pre-loaded in the first phase and then in the third phase the rivet itself to be expanded and the shank to be tom off. In this preferred embodiment, the hydraulic piston, which is mounted on the blind hollow rod, is fitted with a recoil spring at its rear. The recoil spring allows the blind hollow rod to move back into position for insertion of the selftapping blind rivet, as the ball screw would not overcome the frictional resistance of the sealing rings by its downward movement.

[0021] In a further preferred embodiment, the riveting head is rotatable and includes a carrier anchored to the blind hollow bar and an internal chuck with an internal conical surface. The internal conical surface is fitted with sliding taper bolts which serve to clamp the shank of the selftapping blind rivet. The taper bolts are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone. This splining prevents the clamped shank from moving in any direction. The hollow tube is then mounted in the blind hollow rod, the front part of the blind hollow rod being arranged in the riveting head. The drive for rotary movement of the riveting head is connected through gears to the driven gear, which is arranged on a hollow splined shaft to which the outer sleeve of the riveting head is attached by means of a threaded joint. This allows the entire riveting head to rotate.

[0022] The main advantage of the present invention 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 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 sources 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 experimentally on more than one million drilling and riveting operations with self-tapping blind rivets. The presented variants of drives are experimentally verified variants, the constructional arrangement of which forms an economically viable combination of a drive for sliding movement of the riveting head and for rotary movement of the riveting head. The actual operation of the portable riveting device 1 can be viewed on the applicant’s web link www.nex.as.

[0023] Explanation of drawings

[0024] The invention will be explained in detail by drawings which illustrate:

[0025] Fig. 1 side view of a portable riveting device, which is driven by a single electric motor with a pair of clutches. The rotary movement of the electric motor is divided for rotary and sliding drive. The clutch with gearbox through gears sets the riveting head in rotary motion. The second clutch through a set of gears sets the ball screw in motion and this sets the blind hollow rod in sliding, pulling motion,

[0026] Fig. 2 side view of a portable riveting device, which is driven by two electric motors, one for the drilling process and the other for the pulling process. The riveting head is set in rotary motion through a gearbox and gears. The pulling is provided by the motor through a set of gears that sets the ball screw in motion and this sets the blind hollow rod in sliding, pulling motion,

[0027] Fig. 3 side view of a portable riveting device, which is driven by two electric motors, one for the drilling process and the other for the pulling process. The riveting head is set in rotary motion through a gearbox and gears. The pulling is provided by the motor through a gearbox which sets the cam with a lobe in horizontal rotary motion, which moves the bracket attached to the blind hollow rod,

[0028] Fig. 4 side view of a portable riveting device, which is driven by two electric motors, one for the drilling process and the other for the pulling process. The riveting head is set in rotary motion through gears. The pulling is provided by the motor through a gearbox, which sets in motion the ball screw ending with a bracket with an inclined groove moving a pin mounted on the blind hollow rod,

[0029] Fig. 5 side view of a portable riveting device, which is driven by a single hydraulic pump. The riveting head is set in rotary motion through a hydraulic motor driving a gear moving the riveting head. A double-acting hydraulic piston sets the blind hollow rod in sliding motion,

[0030] Fig. 6 side view of a portable riveting device, which is driven by two electric motors, one for the drilling process and the other for the pulling process. The riveting head is set in rotary motion by the first electric motor through gears. The pulling is provided by the second electric motor through a gearbox, which sets in motion the ball screw ending with a piston pushing oil into the hydraulic unit with a recoil spring,

[0031] Fig. 7 side view of the front detail of a portable riveting device with an electrically driven riveting head with a self-tapping blind rivet in the pre-loaded position. Examples of the invention embodiments

[0032] The portable riveting device 1, as illustrated in Figs. 1 to 7, 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 7 to perform both rotary drilling movement and sliding pulling movement. Both types of movements are achieved by means of electric or hydraulic drives with a number of variations in the transmission of the motion force from the drive to the riveting head 7 and the blind hollow rod 8. Importantly, a single drive or two separate drives for each movement are part of a single device that does not require any external element to operate. The shape of the teeth of the taper bolts 32 completely eliminates the rotation or displacement between the taper bolts 32 of the clamped shank 33 of the self-tapping blind rivet 34. The gradual start-up of individual movements is controlled by the electrical control circuit 10, which is connected to the drives. The first phase of the riveting process is the insertion of the self-tapping blind rivet 34 into the riveting head 7 and tits pre-loading by pulling the self-tapping blind rivet 34 further into the portable riveting device 1 with the blind hollow rod 8. Next is the drilling phase and the subsequent riveting phase, which ends with the shank 33 being torn off. The last phase is the return of the portable riveting device 1 to its original position, i.e. the position for inserting the new self-tapping blind rivet 34.

[0033] The rotary movement of the riveting head 7 and the arrangement of its individual internal parts is illustrated in Fig. 7. According to this illustration, the riveting head 7 includes a carrier 30 which is anchored to the blind hollow rod 8 and an internal chuck 31 with an internal conical surface. The internal conical surface is fitted with sliding taper bolts 32, which allow a sufficiently tight clamping of the shank 33 of the self-tapping blind rivet 34. The taper bolts 32 are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone. This splining prevents the clamped shank 33 from moving in any direction. The hollow tube 9 is then mounted in the blind hollow rod 8, the front part of the blind hollow rod 8 being arranged in the riveting head 7. The drive for rotary movement of the riveting head 7 is connected through gears to the driven gear 35, which is arranged on a hollow splined shaft 36 in which the outer sleeve 37 of the riveting head 7 is arranged with a threaded joint. As a result, the entire riveting head 7 rotates with its internal parts, which clamp the shank 33 of the selftapping blind rivet 34 and then move inside the riveting head 7 in a horizontal linear motion.

[0034] Example 1:

[0035] In this particular example of embodiment of the invention, illustrated in Fig. 1, the drive to supply the necessary force for the sliding movement of the riveting head 7, and at the same time the drive to supply the necessary force for the rotary movement of the riveting head 7, is the single central electric motor 2. The central electric motor 2 is fitted with an output shaft 13 in a double-sided design, which enables the torque output from both sides of this central electric motor 2. The central electric motor 2 is connected by means of this output shaft 13 to two mechanical clutches 14, 14' one of which is simultaneously connected to the mechanical gearbox 16. The electrical control circuit 10 is then connected to the mechanical clutches 14, 14' for the synchronization of their switching into a fixed connection with the central electric motor 2. Thus, one side of the output shaft 13 in the double-sided design is connected to the first mechanical clutch 14, and the latter is connected by means of a gear to the ball screw 15 which moves in a nut. The gear on which the nut is attached rotates this nut, so that the ball screw 15 moves back and forth in the horizontal plane depending on the direction of rotation of the nut. The ball screw 15 is securely connected to the blind hollow rod 8 and sets it in a linear horizontal motion, thereby allowing the shank 33 of the self-tapping blind rivet 34 to be pre- loaded, riveted and pulled. The other side of the output shaft 13 in the double-sided design is connected to the second mechanical clutch 14, which is fitted with a mechanical gearbox 16, the mechanical gear 16 being subsequently connected through gears to the riveting head 7 and setting it in rotary motion for drilling the hole.

[0036] Example 2:

[0037] In this particular example of embodiment of the invention, illustrated in Fig. 2, the drive for the sliding movement of the riveting head 7 is the first electric motor 11 and the drive for the rotary movement of the riveting head 7 is the second electric motor 12. The first electric motor 11 sets the blind hollow rod in a linear horizontal motion in the axis of pulling the self-tapping blind rivet 34. The second electric motor 12 sets the riveting head 7 in rotary motion and enables drilling of the hole with the self-tapping blind rivet 34. The first electric motor 11 is connected by means of a gear to the ball screw 15, which moves in the nut. The gear on which the nut is attached rotates this nut, so that the ball screw 15 moves back and forth in the horizontal plane depending on the direction of rotation of the nut. The ball screw 15 is securely connected to the blind hollow rod 8 and sets it in a linear horizontal motion, thereby allowing the shank 33 of the self-tapping blind rivet 34 to be pre-loaded, riveted and pulled. The second electric motor 12 is connected to the mechanical gearbox 16, which is connected to the riveting head 7 via gears and sets it in rotary motion.

[0038] Example 3:

[0039] In this particular example of embodiment of the invention, illustrated in Fig. 3, the drive for the sliding movement of the riveting head 7 is designed in the same way as in Example 2 of the drive for the rotary movement of the riveting head 7. However, the transmission of forces from the electric motors 11, 12 to the riveting head 7, or to the blind hollow rod 8 is different. The first electric motor 11 is connected to the mechanical gearbox 16, which is fitted with a horizontally rotating cam 17 with a cam lobe 18 at its output. The cam lobe 18 is arranged in a bracket 19 which is connected to the blind hollow rod 8. By rotating the cam 17 with the cam lobe 18 about the vertical axis of the cam lobe 18, it moves the bracket 19 in the horizontal direction, thereby also moving the blind hollow rod 8 in a linear motion in the horizontal direction. The transmission of the rotary motion from the second electric motor 12 to the riveting head 7 is the same as in Example 2.

[0040] Example 4:

[0041] In this particular example of embodiment of the invention, illustrated in Fig. 4, the drive for the sliding movement of the riveting head 7 is designed in the same way as in Example 2 of the drive for the rotary movement of the riveting head 7. Again, the transmission of forces from the electric motors 11, 12 to the riveting head 7, or to the blind hollow rod 8 is different. The first electric motor 11 is connected to the mechanical gearbox 16, which is fitted with the ball screw 15 at its output. The ball screw 15 is fitted with a vertically moving bracket 19 with an inclined groove 20 at the end opposite the connection to the mechanical gearbox 16. In this example, the blind hollow rod 8 is fitted with a pin 21 arranged in an inclined groove 20 at its rear. Thus, the up and down movement of the bracket 19 sets the pin 21 in a linear horizontal motion in the axis of pulling the self-tapping blind rivet 34. The transmission of the rotary motion from the second electric motor 12 to the riveting head 7 is the same as in Example 2, except that in Example 1 and Example 4 the drive for the rotary motion of the riveting head 7 is arranged below the level of the rotary riveting head 7, whereas in Example 2 and Example 3 the second electric motor 12 is arranged above the plane of the riveting head 7.

[0042] Example 5:

[0043] In this particular example of embodiment of the invention, illustrated in Fig. 5, both the drive for the sliding movement of the riveting head 7 and the drive for the rotary movement of the riveting head 7 is the hydraulic pump in the form of the gear pump 28 driven by the electric motor 27 of the gear pump 28. Both the gear pump 28 and the electric motor 27 of the gear pump 28 are arranged in the source part 24. The gear pump 28 is fitted with the hydraulic line 22 and this is fitted with the valve 23 connected to the electrical control circuit 10. The electrical control circuit 10 controls the opening of the individual branches of this valve 23. The drive for sliding movement of the riveting head 7 comprises the hydraulic piston 26 designed as a doubleacting hydraulic piston, one chamber of which is connected to the second branch of the outlet of the valve 23 and the second chamber of which is connected to the third branch of the outlet of the valve 23. The gradual opening of the individual branches of the hydraulic line 22 moves the double-acting hydraulic piston in the horizontal plane. The double-acting hydraulic piston is connected to the blind hollow rod 8 and sets it in a linear horizontal motion in the axis of pulling the self-tapping blind rivet 34. The drive for the rotary movement of the riveting head includes the hydraulic motor 25 arranged in the working part and connected to the first branch of the outlet of the valve 23. The hydraulic motor 25 is connected to the riveting head 7 with its output of rotary motion through gears, thus transmitting the rotary motion to the riveting head 7.

[0044] Example 6:

[0045] In this particular example of embodiment of the invention, illustrated in Fig. 6, the drive for the sliding movement of the riveting head 7 is designed in the same way as in Example 2 of the drive for the rotary movement of the riveting head 7. Again, the transmission of forces from the electric motors 11, 12 to the riveting head 7, or to the blind hollow rod 8 is different. The second electric motor 12 is arranged below the axis of the riveting head 7 and sets the riveting head 7 in the rotary motion in the same manner as in Example 4. The first electric motor 12 is connected to the mechanical gearbox 16, which is fitted with the ball screw 15 at its output. The ball screw 15 is fitted with the hydraulic piston 26 at the end opposite the connection to the mechanical gearbox 16, which is arranged in the first hydraulic chamber. The first hydraulic chamber is then connected by channels to the second hydraulic chamber, which is also fitted with the hydraulic piston 26. However, this is attached to the blind hollow rod 8. The first electric motor 11 thus, by means of hydraulic power transmission, sets the blind hollow rod 8 in a linear horizontal motion in the axis of pulling the self-tapping blind rivet 34. In this particular example of embodiment of the invention, the hydraulic piston 26 is mounted on the blind hollow rod 8 and is fitted with the recoil spring 29 at its rear to help in returning the blind hollow rod 8 back into position for insertion of the new self-tapping blind rivet 34. This is because the ball screw 15 would not be able to overcome the friction of the sealing rings of the hydraulic line 22 by its downward movement.

[0046] Industrial applicability

[0047] 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.

[0048] List of index reference numerals

[0049] 1 portable riveting device

[0050] 2 central electric motor

[0051] 3 body

[0052] 4 handle

[0053] 5 switch

[0054] 6 working part

[0055] 7 riveting head

[0056] 8 blind hollow rod

[0057] 9 hollow tube

[0058] 10 electrical control circuit

[0059] 11 first electric motor

[0060] 12 second electric motor

[0061] 13 double-sided output shaft

[0062] 14 first mechanical clutch

[0063] 14' second mechanical clutch

[0064] 15 ball screw

[0065] 16 mechanical gearbox

[0066] 17 cam

[0067] 18 cam lobe

[0068] 19 bracket

[0069] 20 groove

[0070] 21 pin

[0071] 22 hydraulic line

[0072] 23 valve

[0073] 24 source part

[0074] 25 hydraulic motor

[0075] 26 hydraulic piston

[0076] 27 electric motor of the gear pump gear pump recoil spring carrier chuck taper bolts shank of self-tapping blind rivet self-tapping blind rivet driven gear hollow splined shaft outer sleeve

Claims

CLAIMS1. A portable riveting device (1) for drilling and riveting with self-tapping blind rivets (34), comprising a body (3) with a handle (4) with a switch (5) with a working part (6) and a source part (24), a riveting head (7) for clamping the self-tapping blind rivet (34), mounted in the working part (6) of the body (3), a drive for sliding movement of the riveting head (7), a blind hollow rod (8) connected at one end to the riveting head (7) and at the other end to the drive for sliding movement of the riveting head (7), and a hollow tube (9) arranged therein for removing the separated shank (33) of the blind rivet (34), and a drive for rotary movement of the riveting head (7), characterized in that it further comprises an electrical control circuit (10) interconnected with the drive for sliding movement of the riveting head (7) and the drive for rotary movement of the riveting head (7), for their synchronization in drilling and riveting with a single clamping of the self-tapping blind rivet (34) in the riveting head (7).

2. The portable riveting device (1) according to claim 1, characterized in that the drive for the sliding movement of the riveting head (7) and the drive for the rotary movement of the riveting head (7) is a single central electric motor (2) fitted with an output shaft (13), with at least one mechanical clutch and with at least one mechanical gearbox (16), with the electrical control circuit (10) being connected to the mechanical clutch and / or the mechanical gearbox (16) for synchronization in switching into fixed connection with the central electric motor (2), and the output shaft (13) is double-sided or connected to a double-sided drive shaft, where one side of the output shaft (13) and / or of the double-sided drive shaft is connected to the first mechanical clutch (14) connected by means of a gear to the ball screw (15) connected to the blind hollow rod (8) for its linear horizontal movement in the axis of pulling the self-tapping blind rivet (34), and the other side of the output shaft (13) and / or of the double-sided drive shaft is connected to the second mechanical clutch (14') fitted with the mechanical gearbox (16) connected by means of gears to the riveting head (7) for rotary movement of the riveting head (7).

3. The portable riveting device (1) according to claim 1, characterized in that the drive for sliding movement of the riveting head (7) is the first electric motor (11) and the drive for rotary movement of the riveting head (7) is the second electric motor (12), the second electric motor (12) is connected to the mechanical gearbox (16), which is connected by means of gears to the riveting head (7) for setting the riveting head (7) in rotary motion, and the first electric motor (11) is connected by means of gears to the ball screw (15) connected to the blind hollow rod (8) for its linear horizontal movement in the axis of pulling the self-tapping blind rivet (34).

4. The portable riveting device (1) according to claim 1, characterized in that the drive for sliding movement of the riveting head (7) is the first electric motor (11) and the drive for rotary movement of the riveting head (7) is the second electric motor (12), the second electric motor (12) is connected to the mechanical gearbox (16), which is connected by means of gears to the riveting head (7) for setting the riveting head (7) in rotary motion, and the first electric motor (11) is connected to the mechanical gearbox (16) fitted at its output with the horizontally rotating cam (17) with the cam lobe (18) arranged in the bracket (19) which is connected to the blind hollow rod (8) for its linear horizontal movement in the axis of pulling the self-tapping blind rivet (34).

5. The portable riveting device (1) according to claim 1, characterized in that the drive for sliding movement of the riveting head (7) is the first electric motor (11) and the drive for rotary movement of the riveting head (7) is the second electric motor (12), the second electric motor (12) is connected by means of gears to the riveting head (7) for setting the riveting head (7) in rotary motion, and the first electric motor (11) is connected to the mechanical gearbox (16) fitted at its output with the ball screw (15), the ball screw (15) is fitted at its end opposite the connection with the gearbox (16) with a vertically moving bracket (19) with an inclined groove (20), the blind hollow rod (8) being fitted at its rear with the pin (21) arranged in the groove (20) for setting the blind hollow rod (8) in a linear horizontal movement in the axis of pulling the self-tapping blind rivet (34).

6. The portable riveting device (1) according to claim 1, characterized in that the drive for the sliding movement of the riveting head (7) and the drive for the rotary movement of the riveting head (7) is the hydraulic pump arranged in the source part (24) with the hydraulic line (22) fitted with the valve (23) connected to the electrical control circuit (10), where the drive for rotary movement of the riveting head (7) includes the hydraulic motor (25) arranged in the working part (6) and connected to the first branch of the outlet of the valve (23), and the drive for sliding movement of the riveting head (7) includes the hydraulic piston (26) connected to the second branch and the third branch of the outlet of the valve (23).

7. The portable riveting device (1) according to claim 6, characterized in that the hydraulic pump is the gear pump (28) with the electric motor (27) of the gear pump (28).

8. The portable riveting device (1) according to claim 6, characterized in that the hydraulic piston (26) is the double-acting hydraulic piston, one chamber of which is connected to the second branch of the outlet of the valve (23) and the other chamber of which is connected to the third branch of the outlet of the valve (23), where the double-acting hydraulic piston is connected to the blind hollow rod (8) for setting the blind hollow rod (8) in linear horizontal motion in the axis of pulling the self-tapping blind rivet (34), and the hydraulic motor (25) is connected to the riveting head (7) with its output of rotary motion through gears for setting the riveting head (7) in rotary motion.

9. The portable riveting device (1) according to claim 1, characterized in that the drive for sliding movement of the riveting head (7) is the first electric motor (11) and the drive for rotary movement of the riveting head (7) is the second electric motor (12), the second electric motor (12) is connected by means of gears to the riveting head (7) for setting the riveting head (7) in rotary motion, and the first electric motor (11) is connected to the mechanical gearbox (16) fitted at its output with the ball screw (15), the ball screw (15) is fitted at the end opposite the connection with the mechanical gearbox (16) with the hydraulic piston (26) arranged in the first hydraulic chamber, where the hydraulic chamber is connected by channels to the second hydraulic chamber also fitted with the hydraulicpiston (26) mounted on the blind hollow rod (8) for setting the blind hollow rod (8) in linear horizontal motion in the axis of pulling the self-tapping blind rivet (34).

10. The portable riveting device (1) according to claim 9, characterized in that the hydraulic piston (26), which is mounted on the blind hollow rod (8), is fitted at its rear with the recoil spring (29) for moving the blind hollow rod (8) back into the position for inserting the selftapping blind rivet (34).

11. The portable riveting device according to any of claims 1 to 10, characterized in that the riveting head (7) is rotatable and comprises the carrier (30) anchored to the blind hollow shank (8) and the internal chuck (31) with the internal conical surface provided with sliding taper bolts (32) for clamping the shank (33) of the self-tapping blind rivet (34), where the taper bolts (32) are fitted with splining on their inner side, formed by a set of projections in the shape of a truncated cone.

12. The portable riveting device according to any of claims 1 to 11, characterized in that the hollow tube (9) is securely mounted in the blind hollow rod (8), with the front part of the blind hollow rod (8) being arranged in the riveting head (7).

13. The portable riveting device according to any of claims 1 to 12, characterized in that the drive for rotary movement of the riveting head (7) is connected through gears to the driven gear (35), which is arranged on the hollow splined shaft (36) in which the outer sleeve (37) of the riveting head (7) is arranged with a threaded joint.

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