Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1987-05-04
1988-09-13
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
7245317, 2124353, B21J 1520
Patent
active
047700238
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In one form of rivet setting tool for setting screwthreaded rivet nuts or blind rivet nuts, referred to hereinafter for the sake of simplicity as rivet nuts, the tool comprises a forward feed arrangement for imparting an axial movement to the screw-threaded pin or tensile pin, the forward feed arrangement being actuable to perform the rivet nut upsetting operation. The forward feed arrangement comprises a piston cylinder assembly including a pressing piston and a working piston.
In such a tool, the working movement of the pressing piston and the working piston is produced by an external compressed air source, while the return movement of those pistons is produced by springs. The springs required for that purpose are disadvantageous from various points of view. Apart from the fact that the spring force may gradually become weaker due to fatigue in the course of a prolonged period of time or the springs may even become defective, for example they may break, so that the pistons are then no longer satisfactorily returned, there is also the problem that springs of suitable quality are very expensive and also give rise to further labour costs in assembly of the tool. Furthermore, a spring can only exert a given force so that that consideration also limits the speed at which the return movement of the pistons may be effected.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a rivet setting tool which can be produced inexpensively and with a low level of assembly cost.
Another object of the present invention is to provide a rivet setting tool which is comparatively inexpensive but which nonetheless operates with a high degree of reliability and with a high working speed.
In accordance with the present invention, those and other objects are achieved by a rivet setting tool for setting screw-threaded rivet nuts or blind rivet nuts, comprising a feed means which can be actuated for the rivet upsetting operation and which imparts an axial movement to the screwthreaded pin or the tensile pin of the rivet member to be set. The feed means comprises a piston-cylinder assembly comprising a pressing piston and a working piston. The return movement of the pressing piston and the working piston, after operation of the tool, is produced by conducting the operating pressure fluid of the tool to the rear sides of the respective pistons, thus providing for return movement thereof without using return springs to produce such movement. Furthermore, a pressure fluid passage extends from the pressure fluid inlet means of the tool, through the handle portion of the tool, to a rearward chamber which is thus disposed at the rearward side of the working piston and which is closed off by the rearward face thereof, that is to say, the face of the working piston which is remote from the operating tip portion of the tool where the rivet member to be set is held.
Further objects, features and advantages of a rivet setting tool in accordance with the present invention will be apparent from the following description of a preferred embodiment thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional side view of a rivet setting tool according to the invention, in the unactuated condition,
FIG. 2 is a view corresponding to that shown in FIG. 1 of the rivet setting tool in the actuated condition, and
FIG. 3 is a detail of the structure shown in FIGS. 1 and 2, illustrating a shut-off valve for shutting off the flow of compressed air to the tool when it is put down.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring firstly to FIG. 1, shown therein in an unactuated or inoperative condition is a rivet setting tool for setting screwthreaded rivet nuts or blind rivet nuts, comprising a body portion indicated generally by reference numeral 100, and a gripping or handle portion 200 which is formed on the body portion 100. At its forward end, to the left in FIGS. 1 and 2, the body portion 100 comprises a mouthpiece 1. Arranged rearwardly of the mouthpiece 1, that is to say, on the right
REFERENCES:
patent: 3555649 (1979-01-01), Rigot
patent: 3563438 (1971-02-01), Doyle
patent: 4027520 (1977-06-01), Klein
patent: 4130006 (1978-12-01), Ebbert
patent: 4515005 (1985-05-01), Klein
patent: 4580435 (1986-04-01), Port et al.
patent: 4704888 (1987-11-01), Frearson
Alfred Honsel Nieten- und Metallwarenfabrik GmbH & Co.
Jones David
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