Electrical switching device, which switches stroke-dependently, with extended switching hysteresis

Patent metadata

Field	Value
Publication number	US-9704660-B2
Application number	US-201514688580-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Oct 18, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

The disclosure relates to an electrical switching device, which switches stroke-dependently, with extended switching hysteresis, including a switching element with a contact lever, the switching element cooperating with an actuating element movably guided in a holding device. The actuating element has a step-shaped portion for actuating the contact lever of the switching element and the actuating element has an opening in which an engagement element designed as a bolt or a pin engages when a switching action is initiated. The opening provided in the actuating element is formed as an elongated hole, in which the engagement element engages in order to achieve a switching stroke and a defined hysteresis is thus set depending on the design of the elongated hole.

First claim

What is claimed is:

1. An electrical switching device for switching stroke-dependently with extended switching hysteresis, the device comprising:
a holding apparatus;
a movable actuating element guided in the holding apparatus; and
a switching element having a contact lever for interacting with the actuating element;
wherein the actuating element has a step-shaped section for actuating the contact lever of the switching element, wherein the actuating element has an opening in which an engagement element engages when a switching operation is triggered, wherein the actuating element is moved linearly along a movement axis by a movement of the engagement element, and wherein the opening provided in the actuating element is a slot into which the engagement element engages so as to achieve a defined hysteresis depending on the configuration of the slot, the slot having a dimension along the movement axis that is larger than a dimension of the slot perpendicular to the movement axis.

2. The switching device as claimed in claim 1 , further comprising:
a friction force brake for braking movement of the movable actuating element.

3. The switching device as claimed in claim 1 , wherein the engagement element is a bolt or pin.

4. A spring excursion switch comprising:
the switching device having switching hysteresis as claimed in claim 1 ,
wherein the switching device is configured for switching on a pump for delivering fluid from a low-pressure tank into a high-pressure receiver.

5. A hydraulic spring energy store drive for actuating a high-voltage or medium-voltage circuit breaker, comprising:
a storage element for generating pressure in a high-pressure receiver; and
a spring excursion switch including a switching device as claimed in claim 1 , wherein the switching device is configured to interact with the storage element in such a way that the switching element of the switching device will switch on a pump for delivering fluid from a low-pressure tank into the high-pressure receiver depending on the switching hysteresis.

6. The electrical switching device of claim 1 , wherein the slot is an elongated slot.

7. The electrical switching device of claim 1 , wherein the dimension of the slot along the movement axis is larger than a dimension of the engagement element along the movement axis.

8. The electrical switching device of claim 1 , wherein the slot is configured such that the engagement element moves a predetermined distance along the movement axis within the slot before the actuating element is moved linearly along the movement axis by the engagement element.

9. The electrical switching device of claim 1 , wherein the step-shaped section of the actuating element includes only one ramp surface.

10. The electrical switching device of claim 7 , wherein the dimension of the slot along the movement axis is at least twice as long as the dimension of the engagement element along the movement axis.

11. The electrical switching device of claim 1 , wherein the dimension of the slot along the movement axis is at least twice as long as the dimension of the slot perpendicular to the movement axis.

Assignees

• Abb Technology Ag
• Abb Schweiz Ag

Inventors

• Wuerfel Lothar
• Schmidt Matthias
• Bohlaender Joachim

Classifications

• H01H33/34

  hydraulic · CPC title

• H01H3/46

  using rod or lever linkage, e.g. toggle · CPC title

• H01H3/301 Primary

  using a fluid actuator · CPC title

• H01H3/42 Primary

  using cam or eccentric · CPC title