Metal working – Means to assemble or disassemble – Overedge assembling means
Patent
1993-08-11
1995-09-26
Jones, David
Metal working
Means to assemble or disassemble
Overedge assembling means
29243526, B21J 1534
Patent
active
054525055
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to a device for screwing and setting of self-drilling blind rivets, which includes one clamping jaw for holding an installed tensioning spindle in a form-fit or friction-fit manner.
A device of this kind is known, for example, from EP-A 0,213,101. In one retaining unit that has a truncated conical recess on its front end, two clamping jaws are provided diametrically opposite each other. These clamping jaws have on their outer boundary a conical cross-sectional surface so that by means of axial pressing of the clamping jaws into the retaining unit, an inserted tensioning spindle can be grasped and held in place. Since problems of proper rotational catching occur for this type of design since as a consequence of the resulting torque a partial and not necessarily uniform angular displacement of the two clamping jaws can occur. In addition, it is not possible to match the radii of the opening in the retaining unit and the outer region of the clamping jaws at all axial adjusting ranges, so that as a consequence of the impossibility of complete mating, mismatching occurs.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a device of the kind described above in which a precise positional fixing of the clamping jaws takes place and via which an optimum transfer of the necessary torque to the tensioning spindle of the blind rivet to be screwed and set also takes place.
According to this invention, it is proposed that the clamping jaws be of plate-like construction and guided in a retaining unit in an open groove of grooves radial with respect to its middle axis, whereby the base of the groove and the associated boundary surface of one clamping jaw run at the same acute angle to the middle axis of the retaining unit and grow closer together in the direction toward the free end of the retaining unit, and that the latter be held in an axially sliding manner in a housing that can be secured against twisting at least during the setting process.
Due to these features of the invention, the clamping jaws are optimally secured in the direction of rotation, since they are braced on both sides at the guide surfaces, that is, at the lateral bounding surfaces of a radially running groove. This always ensures that the clamping jaws actually act in the direction toward the middle axis of the retaining unit. Thus by an optimum rotational catching of an employed tensioning spindle a blind rivet is secured and no problems of any kind result because of the force absorption in the direction of rotation. The production of clamping jaws is very simple due to the plate-like structure, so that a precision processing is possible by means of punching and milling processes. Thus a much greater selection of materials is possible, so that single sections of the clamping jaws can be prevented from having a brittle material structure, which can occur in particular in manufacturing by means of a pressing step.
When the clamping jaw is not securely pressed down, due to its particular positional lock, proper rotational catching of the tensioning spindle of the blind rivet provided with a force application section is possible, since the jaws cannot move out to the side for any reason. Thus a favorable grasping of the tensioning spindle is possible even for self-drilling blind rivets. In particular when the drill tip is not aligned precisely with the middle axis of the blind rivet and there is the possibility of an irregular motion of the blind rivet during the drilling process, a precisely round hole can still be drilled, and moreover, vibrations will not be transferred to the device itself.
It is particularly favorable that due to the special design and configuration of the clamping jaws, it is now possible that the rotational catching of the blind rivet in the drilling process can occur solely via the tensioning spindle, so that therefore there is no need for an additional application of force to the flange of the rivet casing. Thus it will now be possible to employ rivet ca
REFERENCES:
patent: 2384434 (1945-09-01), Bettington
patent: 3423986 (1969-01-01), Young
patent: 3626745 (1971-12-01), Richardson
patent: 5219375 (1993-06-01), Kamata et al.
Jones David
SFS Rhomberg Gesellschaft m.b.H.
SFS Stadler Holding AG.
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