Electricity: circuit makers and breakers – Multiple circuit control – Operating means
Patent
1996-09-09
1997-12-30
Berhane, Adolf
Electricity: circuit makers and breakers
Multiple circuit control
Operating means
200 4307, 200 6162, H01H 2700
Patent
active
057033390
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In a known switch of this type, the locking member is constructed as a metallic, longitudinally displaceable locking pin which, in the locked position, engages a little in a transverse bore of a plate arranged next to the cam plate and constructed with the latter in one piece. A metallic actuating pin is arranged as actuating member in this transverse bore, which is open with a reduced cross-section towards the key channel. In the locked position, the locking pin keeps the actuating pin in a position in which the latter projects into the key channel. When the key is inserted into the key channel, it must firstly displace the actuating pin so far that the locking pin no longer engages in the bore. Since the key rotates the cam plate after the unlocking, the actuating pin no longer bears against the locking pin in the release position. In order, nevertheless, for both the actuating pin and the locking pin to retain their positions, corresponding bearing surfaces must further be provided for the two pins. The known safety switch is therefore relatively complicated.
OBJECTS AND SUMMARY OF THE INVENTION
It is the object of the invention to provide a more cost-effective safety switch. This object is achieved by a safety switch having the features described and claimed herein.
Owing to the fact that the part of the actuating member projecting into the key channel in the locked position is connected to the locking member via a material part guided laterally past the axis of rotation of the cam plate, the actuating member can be constructed in one piece with the locking member, as a result of which the costs are considerably diminished already purely by the reduced number of the individual parts to be produced and assembled.
The actuating member is preferably constructed as a sliding member which lies in a plane parallel to the cam plate and is provided with a cutout for passage of the axis of rotation. The expenditure for guiding such a sliding member is very low. This applies particularly whenever the cutout is constructed as an elongated hole having a width which is coordinated with the diameter of the axis of rotation, because then the sliding member can be guided by the axis of rotation.
The locking member is preferably formed by a stop for a stop surface of the receptacle, which is formed by a material part provided on the side of the cam plate facing the sliding member. This material part preferably takes the form of a plate into which there penetrates from the circumferential surface a slot-like recess one edge of which forms the stop surface. Such a receptacle can be produced very cost-effectively, since it can also be open in the axial direction.
In the case of a receptacle in the form of a slot-like recess, the stop which forms the locking member preferably has a tooth-like form. A locking member constructed in this way also contributes to the fact that the component forming the locking member and the actuating member can take a form which is simple and cost-effective.
Since the actuating member has at least one material part guided laterally past the axis of rotation, the locking member could lie in the plane defined by the actuating member. In a preferred embodiment, however, the locking member is arranged next to the actuating member on the side thereof facing the cam plate, in radial alignment with the material part forming the receptacle.
A minimum of individual parts is achieved when the material part forming the receptacle is constructed in one piece with the cam plate and the axis of rotation thereof.
Furthermore, on grounds of cost, in a preferred embodiment both the cam plate with the material part forming the receptacle and the axis of rotation, as well as the actuating member and the locking member constructed in one piece with it consist of plastic. Such plastic parts can be produced very cost-effectively.
To the extent that a second locking member with an associated actuating member is provided for safety reasons, the said members are constructed on grounds o
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Rapp Werner
Schmidt Peter
Berhane Adolf
Euchner & Co.
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