US 5,253,738 AGranted

Safety disc brake for lifts

AssigneeInventio AG

InventorsJosef Vertesy, Toni Bissig

Life of this patent

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Abstract

With this safety disc brake all regulatory safety requirements can be fulfilled with a constructional expenditure approximately like that expended for a simple construction of brake. Fulfillment of the essential safety requirements is attained by providing two partial systems which mechanically operate completely independent of one another and comprise two identical brake levers each provided with a respective separate compression spring braced at a common central impact member fixedly connected with a machine part. As a further feature for fulfilling the safety requirements both of the partial systems are devoid of any mutual mechanical penetrations and overlapping. Opening or release of the brake is accomplished electromagnetically with a pot magnet fixedly secured to one brake lever and an armature plate likewise fixedly secured to the other brake lever. The attachments for connection of the pot magnet and the armature plate to the brake levers are adjustable, so that the armature plate is always attracted for parallel movement by the pot magnet and thus there is not produced impact noise.

Claims6

Dependent claims

A safety disc brake, especially for lifts, comprising:

carrier bolts;
two brake levers pivotally mounted upon the carrier bolts;
said brake levers being provided with brake shoes and brake linings;
each of said brake levers having a longer arm and a shorter arm;
a brake disc;
pre-biased brake springs for urging the brake shoes and brake linings of the brake levers against the brake disc;
said pre-biased brake springs being arranged between the longer arms of the brake levers and exerting a brake spring force;
said brake levers being non-overlapping and mechanically independently movable;
means for exerting an electromagnetic counter force effective at the region of the longer arms of the brake levers to lift the brake shoes and brake linings of the brake levers off the brake disc;
said means for exerting an electromagnetic counter force comprising an electromagnet which actuates the brake levers against the brake spring force of the brake springs;
said electromagnet comprises a pot magnet which is fixedly connected with one of the brake levers of the two brake levers and an armature plate which is fixedly connected with the other brake lever of the two brake levers;
the electromagnet has a predetermined working direction;
means defining a respective three-point attachment having three attachment locations respectively associated with the pot magnet and the armature plate and adjustable at each attachment location in said predetermined working direction;
one of said three-point attachments connected the pot magnet with the one brake lever;
and
the other of said three-point attachments connecting the armature plate with the other brake lever.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/727,586Filed 9 Jul 1991
Priority: CH 02 327/9012 Jul 1990
Granted: 19 Oct 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B66D 5/14
With axial effect: embodying discs
B66B 5/04
Responsive to abnormal operating conditions: for detecting excessive speed
B66B 5/18
Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well: and applying frictional…
F16D 55/2245
With a common actuating member for the braking members: in which the common actuating member acts on two levers carrying the braking members, e.g.…