Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Reexamination Certificate
1999-11-17
2001-10-16
Jones, David (Department: 3725)
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
C029S243525, C029S809000, C029S812500
Reexamination Certificate
active
06301948
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a rivet setting device comprising a rivet setting means and a drive which actuates the rivet setting means, as well as a magazine-strip pulling means which comprises a roll in operative communication with the drive.
Such rivet setting devices are known from the prior art. These are battery-operated rivet setting devices for setting blind rivets. The rivet setting means performs a pulling movement and is connected via a gearing to the drive which is formed by an electric motor. The gearing converts the rotational movement of the electric motor into a linear movement of the rivet setting means. The blind rivets are arranged on the magazine strip and are supplied via a supply means to the rivet setting means. The magazine-strip pulling means is provided for winding up the magazine strip after the removal of the blind rivet and for driving the magazine strip so as to supply further blind rivets. To this end, the magazine-strip pulling means comprises a roll which winds up the empty magazine strip under tension.
So far, magazine-strip pulling means of such a type could not be used for pneumatically and/or hydraulically operated rivet setting devices.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide a rivet setting device including a magazine-strip pulling means, which can also be operated pneumatically and/or hydraulically.
This object is achieved according to the invention in that the drive comprises a pneumatic and/or hydraulic linear drive including a piston-cylinder means and that a gearing is provided for translating a linear movement of the piston-cylinder unit into a rotational movement of the roll at least temporarily.
Such a solution is simple, and makes it possible to provide a magazine-strip pulling means compatible with conventional rivet supply means also in hydraulically and/or pneumatically operated rivet setting devices.
In an advantageous development of the invention, a freewheel may be provided so that the linear movement of the piston-cylinder means is transmitted to the roll in one direction only. The gearing can thereby be adapted in an easy manner to the requirements of the magazine-strip pulling means. Since the piston-cylinder means performs a reciprocating linear movement, only one motional direction of the piston-cylinder means can be used on account of said freewheel for driving the roll. This is of particular importance since the magazine strip can only be wound up in one rotational direction of the roll.
Moreover, it may be of advantage when the rivet setting device comprises a mouthpiece for receiving at least one rivet and the rivet setting means comprises a pulling means, with the pulling means being adapted to be moved by the piston-cylinder means from a position closer to the mouthpiece into a position further away from the mouthpiece for performing a rivet setting operation and the pulling means being returnable after the rivet setting operation, with the piston-cylinder means being only connected back to the roll during the return movement. It is thereby possible that the magazine strip is only wound up during the return stroke and not during the rivet setting operation.
Moreover, in an advantageous development, there may be provided a blocking means which inhibits a rotation of the roll at least during the rivet setting operation. In such a case, an unintended rotation of the roll during the rivet setting operation can also be prevented.
Moreover, it may be of advantage when the roll is designed as a winding roll for winding up a magazine strip. In such a case, the magazine strip is not only drivable by the roll, but can also be wound up at the same time and stored for re-use.
In an advantageous development of the invention, the gearing may comprise a rack gear including a rack which is provided on the piston-cylinder means and/or the pulling means and in which a gear which is connected to the roll is meshing at least indirectly. A particularly simple gearing can thereby be realized.
To achieve a particularly compact structure, the piston-cylinder means may be arranged between the rivet setting means and the gearing.
Moreover, the rivet setting device can be designed in a particularly compact manner if the piston-cylinder means comprises a continuous piston rod. Said piston rod can then be connected to the rivet setting means on the one hand and to the gearing on the other hand.
It may be of advantage when the piston rod is designed as a tube for passing torn-off rivet mandrels therethrough. In such a case, the rivet mandrels which have been torn off during the rivet setting operation can be discharged from the rivet setting means through the piston rod, which is designed as a tube, and out of the housing of the rivet setting device.
To this end, it may turn out to be of advantage when the piston rod terminates in a rivet-mandrel collecting container. This can also yield a more compact design of the rivet setting device. Moreover, stray rivet mandrels are avoided.
Moreover, it may turn out to be of advantage when the gearing is arranged between the rivet-mandrel collecting container and the piston-cylinder means. As a result, the rivet setting device can also be made more compact.
In an advantageous development of the invention, the piston of the piston-cylinder means may be movable in the pulling direction of the pulling means of the rivet setting means for performing a rivet setting operation, with the piston being movable from an initial position arranged closer to the mouthpiece into a position further away from the mouthpiece for performing the rivet setting operation. Such a design may also simplify the structure of the rivet setting device.
Moreover, it may also turn out to be of advantage when the piston-cylinder means is biased by a spring means into the initial position. A particularly simple drive can thereby be realized, with the piston of the piston-cylinder means being also returnable by the spring means.
It may also be of advantage when the spring means comprises at least one pressure spring which is arranged in the cylinder of the piston-cylinder means and is supported between an inner cylinder wall at the front side and the piston. A particularly compact and simple design of the rivet setting device can also be realized thereby.
A further simplification of the design of the rivet setting device can be achieved when the rack is made integral with the piston rod. The number of the necessary components can further be reduced thereby.
It may turn out to be of advantage when there is provided a second rack which is opposite to the first rack and arranged on the piston rod and preferably made integral therewith and in which a second guide gear which is rotatably supported within the housing is meshing. A precise support of the piston rod between the two gears can thereby be realized.
It may also turn out to be of advantage when the roll is supported by a roll shaft which projects into the housing and is rotatably supported within the housing and when the gear which is connected to the roll is connected to the roll shaft within the housing. A particularly simple gearing can thereby be constructed.
It may also turn out to be of advantage when the freewheel is arranged between the roll shaft and the roll and when the gear is connected to the roll shaft for rotation therewith. The gearing can thus be designed in a particularly compact manner, with the freewheel being possibly arranged outside the housing, whereby the housing can be made even more compact.
These and other features and advantages of the invention will be apparent from the figures as fully explained in the Detailed Description of the Preferred Embodiments.
REFERENCES:
patent: 2495070 (1950-01-01), Mellodge
patent: 2753072 (1956-07-01), Mitchell
patent: 3119507 (1964-01-01), Burritt
patent: 3127045 (1964-03-01), Tschantz
patent: 3359777 (1967-12-01), Lee
patent: 3375883 (1968-04-01), Schadlich
patent: 3397567 (1968-08-01), Klingler
patent: 3410128 (1968-11-01), Sauter et al.
Coudert Brothers
Jones David
M. H. Honsel Beteiligungs GmbH
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