Machine element or mechanism – Automatic operation or control
Patent
1997-02-14
1999-07-20
Herrman, Allan D.
Machine element or mechanism
Automatic operation or control
200400, 200401, G05G 1700, H01H 500
Patent
active
059243236
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a lever arrangement for transmitting a driving force to a switch contact of a power switch, with a spring energy store device and a plurality of levers connected by hinge pins and arranged between the spring energy store device and the switch contact, and with parallel bearing plates that accommodate the lever arrangement between them.
BACKGROUND OF THE INVENTION
Examples of such lever arrangements are disclosed in German patent DE-A 3,542,746 and European patent EP-A 88,215. The low-voltage power switches described there are designed for a high switching capacity and therefore require a very efficient switching mechanism.
OBJECTS AND SUMMARY OF THE INVENTION
One object of the invention is to design the lever arrangement so that the weight and cost of the power switch will be within a favorable range.
This object is achieved according to this invention by mounting a parallel limiting part on each of the bearing plates with a spacer inserted in between, where the clearance between the limiting parts corresponds to a local width of the lever arrangement, and the bearing plates are connected by at least one retaining pin connected to each of the bearing plates.
These features achieve the result of a simple design of the hinges between the pairs of levers, in which guidance with practically no play is possible and nevertheless the bearing plates may have a spacing suitable to also accommodate components of the lever arrangement having a greater width. The framework consisting of the bearing plates and the limiting parts is also characterized by a high flexural strength with a relatively low weight.
It is equally advantageous in terms of strength and ease of assembly if the retaining pin is riveted rigidly at one end to the respective bearing plate and if the other end with a threaded stem passes through an orifice in the other bearing plate and is secured with a nut.
The lever joints can be simplified by designing at least one of the hinge pins so that it corresponds to the spacing between the bearing plates, and providing the limiting parts with through-holes for hinge pins.
At least one of the retaining pins can be designed as a stop to limit the path of parts of the lever arrangement. This has the advantage that the force is introduced uniformly into the bearing plates.
At least one of the retaining pins can be designed to connect both the bearing plates and the limiting parts.
A suitable thrust bearing with an especially good load-bearing capacity results from an arrangement where a stationary hinge pin of the lever arrangement rests with each end in a bearing sleeve that engages with a pin in an orifice of the respective bearing plate and engages with a collar in an orifice of the respective limiting part.
The bearing plates can also be designed as an abutment for the spring energy store device and may be arranged with a distance between them that corresponds to the diameter of the spring energy store device.
Even for the strong forces that occur in releasing the spring energy store device, the framework can be set up by arranging two pairs of end faces opposite a pressure plate of the spring energy store device as the end stop, where one pair is formed by the limiting parts and the second pair is formed by two guide partitions attached to the bearing plate.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention described above and additional features are described in greater detail below with respect to the embodiment illustrated in the drawings, of which:
FIG. 1 is a schematic diagram of a lever arrangement for a low-voltage power switch.
FIG. 2A is a front view of an arrangement of bearing plates and limiting parts to accommodate the lever arrangement.
FIG. 2B is a magnification of a portion of the view shown in FIG. 2A.
FIG. 3 is a front view of an arrangement corresponding to that in FIG. 2A, with bearing plates and limiting parts shown together with a lever arrangement.
FIG. 4 is a side view of a single bearing plate with a l
REFERENCES:
patent: 4901821 (1990-02-01), Dale
patent: 5545867 (1996-08-01), Castonguay et al.
Godesa Ludvik
Sebekow Michael
Wihan Adolf
Herrman Allan D.
Siemens Aktiengesellschaft
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