A tool, especially for drawing of blind rivets provided with upsetting pins, but also for drilling and screw driving.

Abstract: The invention relates i.a. to a tool for drawing blind rivets, especially self-drilling ones, provided with upsetting pins. The tool is intented to be attached to the driving axle (2) of a hand tool (1) and comprises a nozzle (8) with a through hole (9) of such a design that a blind rivet inserted therein is turned along when the driving axle (2) is rotated in one direc­ tion, and that a drawing device (10, 12) draws off the upsetting pin of the rivet when the driving axle (2) is rotated in an op­ posite direction.

Description: This invention relates to a tool intended to be used for drawing of blind rivets provided with upsetting pins but which can also be used for drilling and screw driving. The tool of the invention can be used for riveting of conventional Pop rivets but is preferably intended for use with a self-drilling blind rivet of Pop rivet type, the rivet being inserted with its upsetting pin into the tool, a rivet hole being drilled and riveting being carried out by drawing off the upsetting pin of the rivet, tearing off this and drawing out the remaining pin from the upset attached rivet. All these operations can be carried out by a tool of the invention in one sequence without any change of tool. When riveting by means of so-called Pop rivets a hole is first drilled by means of a drilling machine in the workpiece after which the tool is changed and riveting is carried out with hand tongs or possibly hydraulically or pneumatically operated riveting machines. This work will be time-consuming as drilling must first be carried out by means of a machine and tools must then be changed to carry out riveting either by hand power or heavy and complicated riveting tools. From US-A-3 399 561 is known a rivet setting tool corresponding to the preamble of claim 1 and for the setting of blind rivets. However, this previous rivet setting tool is relatively complicated, heavy and also expensive in manufacturing. This prior art rivet setting tool is not intended for drilling purposes using a blind rivet with drilling properties. The object of the present invention is to provide a small, light and handy tool so that riveting, tearing off and extraction of the rivet pin can be carried out using the same tool, and if the rivet is provided with drilling means also conduct the drilling by means of the tool. Another object of the invention has been to form the tool so that it is also easy to adapt a drill to the tool and so that the tool can be used for drilling and, moreover, screw driving. These objects have been achieved in that the invention has been given the characteristic features set forth in the claims. The invention is now described in greater detail in the form of an illustrative example shown on the drawing, where Fig. 1 is a longitudinal section of a tool embodied according to the invention. The tool shown in Fig. 1 is intended to be used in a preferably electrically operated screwing machine 1 reversible for right- or left-hand operation. However, the machine can also consist of a machine operated hydraulically or by means of compressed air. On the driving axle 2 of the screwing machine 1 there is arranged an inner sleeve 3 which is screwed onto the driving axle 2, preferably by means of threads, and which is connected non-rotatably with the driving axle 2 in mounted position by means of a locking screw 4. This inner sleeve 3 is surrounded by an outer mantle 5 which at its end facing away from the driving axle is provided with a front end sleeve 6 arranged detachably in the outer mantle and connected non-rotatably with the outer mantle 5 by means of a locking 7. In the front portion of the end section 6 a replaceable nozzle 8 is screwed which has a through hole 9 of a cross-section with preferably many edges, for reasons described more in detail below. The end section 6 is internally hollow and this cavity has preferably a square cross-section. A drawing member 10 projects into this cavity with its in this portion externally, preferably squarely formed sliding portion 10a. The other end of the drawing member 10 is connected with an internal thread in the inner sleeve by means of an external thread 11. The thread of the drawing member 10 and in the inner portion 3 is left-handed for reasons described more closely below. At its front portion the drawing member 10 is formed to be tapering and bearing upon two conical drawing chucks 12 which have a through passage for a rivet pin between themselves. Inside of the drawing chucks 12 a receiving member 13 is arranged in an internal cavity in the drawing member, said receiving member bearing upon the drawing chucks 12 and urged against these by means of a spring 14 attached to the rear portion of the drawing member 10 by means of a pressure plate 15 and a nut 16. When using the tool a rivet is entered with its upsetting pin through the hole 9 of the nozzle 8 so that the rivet will bear upon the nozzle 8 with its pre-shaped flange. The rivet used is preferably but not necessarily provided with a drill point and an upsetting pin preferably with several edges, adapted to the passage 9 in the nozzle 8 and projecting therein. If the rivet is then provided with a self-drilling point the driving axle 2 is put in right-hand rotation, the whole tool rotating in this direction. Alternatively, the nozzle 8 can be formed externally as the tip of a cope chisel to engage a cross-shaped groove in the collar portion of a rivet sleeve, in order to rotate the rivet sleeve. When the hole is drilled and riveting is to be carried out the direction of rotation of the driving axle 2 is reversed to left-hand rotation. As the thread 11 of the drawing member 10 and the inner sleeve 3 is left-hand the drawing member 10 is drawn inwards in the inner sleeve 3 and is prevented from rotation as the sliding portion 10a of the drawing member is square and projects into the square cavity in the end portion 6. The tapering portion of the drawing member will then clamp the jaws 12 which are pressed against the rivet pin, engage this and thereby drawing the driving axle 2 together with the machine casing 1 forwards towards the outer mantle 5 until abutment against the same. The outer mantle 5 is then prevented from further rotation. On the other hand, the drawing member 10 can be further displaced into the inner sleeve 3 until the rivet has been compressed and pulled off. After this the direction of rotation of the driving axle 2 is again reversed to right-hand rotation and one grasps with one's hand the outer mantle 5 to prevent this from rotation. The drawing member 10 is then displaced outwards again, the jaws 12 being pressed apart by the receiving member 13 and released from the pin. If the tool is then directed downwards the rest of the pin will fall out and a new riveting operation can be started. Thus, the tool of the present invention has been given a simple construction making it possible to manufacture the tool relatively cheaply and, moreover, it is reliable in use. If the tool is to be used for screw driving or other works in machines where left-hand operation can be required the outer mantle 5 can be locked onto the inner sleeve 3 by screwing out the locking screw 4 some turns in order to connect these portions non-rotatably with each other. Of course the tool can also be formed as a special machine merely intended for rivet drawing and drilling in connection with drawing of self-drilling blind rivets.

Claims: A tool for drawing blind rivets provided with upsetting pins, comprising all inner sleeve (3) attached to a driving axle (2) of a manual driving tool (1), an outer mantle (5) surrounding the inner sleeve (3), a nozzle (8) attached to the end of the outer mantle (5) facing away from the driving axle (2) and having a through hole (9) for receiving the upsetting pin of a rivet, and a drawing device (10, 12) inside of the nozzle (8) for grasping the upsetting pin of the rivet, said drawing device comprising two conical chucks (12) and a drawing member (10) surrounding these, characterised in that the drawing member (10) is provided with an external threading (11) adjacent the inner sleeve (3), in that the inner sleeve (3) is provided with an internal threading adapted to engage the external threading (11) of the drawing member (10), in that the drawing member (10) is arranged non-rotatable but axially displaceable in relation to the outer mantle (5), in that the inner sleeve (3) is rotatable in relation to the outer mantle (5) such that rotation in a first direction of rotation of the inner sleeve (3) via the threaded engagement with the drawing member (10) causes axial displacement of the drawing member (10) towards the driving axle (2) thereby causing the chucks (12) to grip and draw along the rivet upsetting pin, whereas rotation in the opposite direction of the inner sleeve (3) causes axial displacement of the drawing member (10) away from the driving axle (2), and in that the outer mantle (5) co-operates with the manual driving tool (1) to limit and thereafter prevent relative rotation therebetween in a first direction of rotation of the driving axle (2), whereby the inner sleeve (3) rotates with respect to the outer mantle (5) in said first direction, and that the outer mantle (5) and the inner sleeve (3) are provided with cooperating means which limit and thereafter prevent relative rotation therebetween in the opposite direction of rotation of the driving axle (2), whereby the outer mantle (5) and the inner sleeve (3) are then rotated together in said opposite direction. The tool of claim 1, characterized in that at the end of the outer mantle (5) facing away from the driving axle (2) a separate front end sleeve (6) is screwed in and in which the nozzle (8) is attached, and which end sleeve (6) is internally hollow with a non-cylindrical cross-section and in which non-cylindrical cavity the drawing member (10) projects with a front portion (10a) also being non-cylindrical. The tool of claim 2, characterized in that the threading of the drawing member (10) and the threading (11) of the inner sleeve (3) are left-threaded. The tool of any one of the preceding claims, characterized in that the nozzle (8) is embodied to be able to rotate the upsetting pin of the rivet or the very rivet.

Inventors: NORDSTROEM CURT, STENBERG SVEN, NORDSTROEM, CURT, STENBERG, SVEN, Nordström, Curt
Applicants: NORDSTROEM CURT, STENBERG SVEN, NORDSTROEM, CURT, STENBERG, SVEN
Application year: 1986
Main classification: B21J15
IPC codes: B21J15, F16B19, F16B1, B25B21, F16B25