EP1913615B1 - Tensioning apparatus - Google Patents

Description

The invention relates to a clamping device for a switching energy storage of a circuit breaker, in which a rotatable means of a drive wheel clamping shaft for clamping the switch energy storage is fixedly connected to an eccentric and with a cam and having a trigger stop, and wherein the drive wheel via a coupling with the Clamping shaft is coupled.

Such a clamping device is from the DE 199 33 637 C1 known. In this clamping device, a spur gear is separated as a drive wheel after tensioning a closing spring as a switch-on energy storage by a disengageable clutch. By separating or decoupling is achieved that the spur gear, which is the spur gear of a transmission, and thus continue to run the gear or can be further rotated without increased wear of the tensioning device or the transmission, for example, by improper operation occurs. The disengageable clutch comprises a bearing sleeve which is displaceable by means of balls and which engages over a toothed surface with a toothed surface of the spur gear, as long as a lever system comprises two rotatably mounted levers with wedge-shaped surfaces and a knee lever system connected thereto via a pressure element coupled. After performing the clamping operation, the toggle lever system is raised via a further pressure element, whereby the two levers are rotated, so that the spur gear is decoupled from the bearing sleeve. The arrangement with a sliding about a ball bearing sleeve, which via a lever system of a plurality of rotatably mounted levers and toothed surfaces with the spur gear of the transmission is coupled or decoupled, represents a complex and cost-intensive arrangement.

From the DE 25 18 599 B1 an engine storage drive for circuit breakers is known in which a switch-on energy storage in the form of a storage spring is connected via a clamping shaft and a one-way clutch with a pawl assembly.

Object of the present invention is to form a clamping device of the type mentioned, which has a simple and inexpensive construction.

The object is achieved in that according to the invention the coupling is a latch arrangement. By such a pawl arrangement, a clamping device is provided, which is designed in terms of their coupling advantageously simple and cost-effective, because the latch assembly requires relatively few components. It is prevented solely by the pawl arrangement that takes place by further actuation of the drive wheel after a clamping operation improper loading of the tensioning device, for example in a run-on of a motor drive.

In a preferred embodiment, the pawl assembly has a pawl rotatably mounted on the drive wheel, and a fixed stop member is provided for controlling the pawl. An advantage of such an arrangement is that alone by the rotatable arrangement of the pawl and the fixed stop element controlling the pawl and thereby decoupling of the drive wheel is made possible by the clamping shaft.

In an advantageous embodiment, the fixed stop element is arranged such that, when the switch-on energy store is tensioned, the pawl releases the clamping shaft. Such an arrangement provides an easy way to decouple the tensioning shaft from the drive after a clamping operation with a tensioned switch energy storage.

In another advantageous embodiment, the pawl assembly has a fixedly connected to the clamping shaft and cooperating with the pawl carrier. The arrangement of such a driver is a simple and convenient way to couple the drive wheel and the clamping shaft with each other by means of the pawl to perform a clamping operation.

The latch assembly may be guided in different ways with respect to its free end, for example, by a stationary guideway. In an advantageous development, the latch arrangement has a spring element. By providing a spring element ensures that the pawl is held during a clamping operation in a cooperating with the driver position.

In a further preferred embodiment of the invention, a position pin is provided on the drive wheel. The provision of such a Positungsstiftes advantageously limits the rotation of the rotatably mounted pawl by the force transmitted by the spring element, whereby a wear of the pawl is prevented by a sliding movement on the tensioning shaft during rotation in preparation for a clamping operation of the power skimmer.

The invention will be explained in more detail below with reference to the accompanying drawings and an embodiment with reference to the figures.

Figur 1

einen schematische Seitenansicht der erfindungsgemäßen Spannvorrichtung;

Figur 2

eine Vorderansicht der Spannvorrichtung aus Figur 1 in einer ersten Position während des Spannvorganges;

Figur 3

eine Vorderansicht der Spannvorrichtung in einer entkoppelten Position.

Show it:

FIG. 1

a schematic side view of the clamping device according to the invention;

FIG. 2

a front view of the clamping device FIG. 1 in a first position during the tensioning process;

FIG. 3

a front view of the clamping device in a decoupled position.

FIG. 1 shows a clamping device according to the invention for a switch-on energy storage in a schematic side view. The device comprises a tensioning shaft 1, at the first end 2 of which an eccentric 3 is arranged. At the second end 4 of the clamping shaft 1, a cam 5 is fixedly connected to the clamping shaft 1. The cam 5 is in a circuit breaker in operative connection with a switching shaft, not shown, for transmitting the energy stored in the switching energy storage to close movable contacts of the circuit breaker. On a housing part 6 of the clamping device, in which the clamping shaft 1 is rotatably supported by ball bearings 6a, 6b, a fixed stop element 7 is arranged. Firmly connected to the tensioning shaft 1 is a driver 8, which cooperates via a pawl 9 with a drive wheel 10. The pawl 9 is rotatably arranged by means of a spring element 11 on the drive wheel 10. The drive wheel 10 is the last drive wheel of a transmission, not shown, for example, a worm gear, which is driven by means of a hand crank or a motor drive. At the eccentric 3 is a switch energy storage 13, for example, a spring element 13, articulated. A trigger stop 14 is provided as a stop for the clamping device after a clamping operation, wherein the trigger stop can be triggered by means of a release mechanism, not shown, to clamped Einschaltergiespeicher perform a switching operation of the circuit breaker.

FIG. 2 shows a front view of the clamping device according to the invention in a position during the clamping operation of the switch-on energy storage. The pawl 9 is at its end 15 via the contact surface 16 with the driver 8 in contact. At the end 15 of the pawl 9, a stop 17 is formed, which bears against a drive pin 10 on a position pin 18. By a brought about via the drive rotation of the drive wheel 10, the clamping shaft 1 and thus the eccentric 3 is set in a clockwise rotation via the voltage applied to the driver 8 pawl 9. As a result, the stored on the eccentric switch energy storage 13 is stretched. In the position of FIG. 2 the eccentric 3 is in a position in which the Einschaltergiespeicher 1 is below its maximum compression spring tension. In order to produce a torque necessary for triggering a switching operation, the eccentric must be turned further into a position deviating by a few degrees from this maximum extended position.

In FIG. 3 the position of the pawl 9 is shown after a fully executed clamping operation of the switch-on energy storage 13. Upon rotation of the drive wheel 10 in a clockwise direction, the pawl 9 comes into contact with the fixed stop element 7, whereby a rotation of the pawl 9 is triggered about the axis 12 in the counterclockwise direction, so that the contact surface 16 is no longer applied to the driver 8 and the pawl of Driver 8 is pivoted away. The clamping shaft 1 is decoupled in this position from the drive wheel 10 and thus from the drive. By a further rotation of the drive wheel 10 thus no force is exerted on the cam or the eccentric more.

During a switch-on of the trip stop 14 is released, so that the energy stored in the switch energy storage 13 is expended for rotation of the associated with the clamping shaft 1 cam 5 and thus to close the movable contact of the circuit breaker. In this case, the tensioning shaft 1 and the parts connected to it rotate in the direction of the arrow 19 of the FIG. 3 until the turn-on energy storage 13 is completely relaxed. The drive wheel 10 with the pawl 9 remains in the position of FIG. 3 , As a result, no energy is transferred to the drive wheel and the drive during the switching process. If a new clamping operation is carried out after the switching operation, the drive wheel 10 is likewise moved in the direction of the arrow 19 via the drive. The pawl is thereby further deflected on the fixed stop element 7 and moves along this until, by the rotation of the drive wheel, the pawl is no longer in contact with the fixed stop element and is rotated by the force exerted by the spring element 11 in the direction of the tensioning shaft until the pawl rests on the position pin 18. By the position pin 13 prevents the pawl 9 rests during the further rotational movement of the drive wheel 10 on the clamping shaft 1. Due to the further rotational movement, the pawl 9 comes into contact with the driver 8, so that the drive wheel 10 and the tensioning shaft 1 are coupled again and the switch-on energy storage 13 is again tensioned.

LIST OF REFERENCE NUMBERS

1

clamping shaft

2

First end

3

eccentric

4

Second end

5

cam

6

housing part

6a, 6b

ball-bearing

7

Fixed stop element

8th

takeaway

9

pawl

10

drive wheel

11

spring element

12

axis

13

switch-

14

trigger stop

15

End latch

16

contact area

17

attack

18

positioning pin

19

arrow

Claims (5)

1. Stressing apparatus for a switch-on energy store (13) for a circuit breaker,

   - in which a stressing shaft (1), which can be rotated by means of a drive wheel (10), is in each case firmly connected to an eccentric (3) and to a cam disk (5) in order to stress the switch-on energy store (13),

   - which has a tripping stop (14), and

   - in which the drive wheel (10) is coupled to the stressing shaft (1) via a coupling (7, 8, 9, 11, 12, 18), characterized in that

   - the coupling (7, 8, 9, 11, 12, 18) is a latching arrangement (7, 8, 9, 11, 12, 18) which has a catch (9) which is arranged on the drive wheel (10) such that it can rotate, and

   - a fixed stop element (7) is provided in order to control the catch (9).
2. Stressing apparatus according to Claim 1,
   characterized in that
   the fixed stop element (7) is arranged such that the catch (9) releases the stressing shaft (1) when the switch-on energy store (13) is stressed.
3. Stressing apparatus according to Claim 1 or 2,
   characterized in that
   the latching arrangement (7,8,9,11,12,18) has a driver (8) which is firmly connected to the stressing shaft (1) and interacts with the catch (9).
4. Stressing apparatus according to one of the preceding claims,
   characterized in that
   the latching arrangement (7, 8, 9, 11, 12, 18) has a spring element (11).
5. Stressing apparatus according to Claim 4,
   characterized in that
   a position pin (18) is provided on the drive wheel (10).

Images