Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1986-12-15
1988-06-14
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
7245316, 2924353, B21J 1520, B21J 1526
Patent
active
047503475
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a riveting apparatus, for pop-rivets in particular, to be attached as an accessory to a tool provided with a rotatable shaft, preferably to a drilling machine, in such a manner that the tool preserves the original use thereof.
Previously known riveting appparatuses have been separate lever-operated tools designed specially for riveting.
A disadvantage of such previously known riveting apparatuses is that two separate tools are needed to carry out the riveting, i.e. a drilling machine for preparing a hole and a riveting apparatus for fixing the rivet in the hole. This, of course, is inconvenient and causes unnecessary stages in the work. Another disadvantage connected with previously known riveting apparatuses is that the wedge angle of the wedge-shaped gripping jaws which are manually clamped on the rivet shank is very small and the axial movement is long so that the apparatus could be operated with a reasonable force. Still another disadvantage is that the jaws very easily lock on the rivet shank after they have been drawn to the back position, and it is very difficult and time-consuming to remove the rivet shank from the riveting apparatus.
The object of the present invention is to eliminate the disadvantages of previously known riveting apparatuses and to provide a novel riveting apparatus by means of which the riveting can be carried out easily and rapidly.
This object is achieved according to the invention by means of a riveting apparatus of the type mentioned in the beginning, which apparatus is characterized in that the riveting apparatus is formed by an eccentric driven by the tool and a hydraulic power unit driven by the eccentric and supported by the tool, said power unit comprising gripping means driven by said unit for clamping a rivet shank and for the drawing and detaching thereof.
According to a preferred embodiment of the invention the power unit is supported by means of a supporting arm, whereby the power unit of the riveting apparatus serves as an additional handle for the tool when pivoted away from the working position.
The hydraulic power unit preferably comprises a first hydraulic driving means which is connected to the eccentric, and a second hydraulic means driven by a hydraulic fluid fed by the first hydraulic means.
With regard to the advantages of the invention, it is to be mentioned that the riveting apparatus according to the invention does not prevent the use of the tool for the original purpose thereof so that the riveting can be wholly carried out by using a drilling machine and the riveting apparatus according to the invention, which is attached thereto as an accessory. The invention is also advantageous in that the riveting apparatus is light to operate and the riveting can be carried out rapidly. Further, it is to be noted that in the riveting apparatus according to the invention the wedge angle of the gripping jaws which grip the rivet shank has been essentially increased, whereby the shorter axial movement enables the rivet shank to be gripped more rapidly; and that the drawing of the rivet shank as well as the detachment of a cut rivet shank is reliable.
The invention will be described below by means of one preferred embodiment thereof with reference to the attached drawing, wherein
FIG. 1 is a general view of a riveting apparatus according to the invention as attached to a drilling machine,
FIG. 2 is a cross-sectional view of a hydraulic power unit of a riveting apparatus according to the preferred embodiment of the invention, and
FIG. 2b is a further cross-sectional view of a hydraulic power unit of a riveting apparatus to the preferred embodiment of the invention and also depicting the operation of the apparatus, and
FIG. 3 shows an alternative embodiment for the attachment of the riveting apparatus to a drilling machine.
In the embodiment according to FIG. 1 the riveting apparatus according to the invention is fastened to the fixing collar of the drilling machine by means of a supporting arm 7 provided with a joint 6; and an eccentric 3 su
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