DE7736812U1 - CONTACT DEVICE FOR MEASURING EQUIPMENT - Google Patents

Description

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ALEXANDER WIEGAND GmbH & Co.
Armatures and pressure gauges factory
8763 Klingenberg / Main

Contact device for measuring devices

The innovation relates to electromechanical contact devices for installation in measuring devices such as manometers, thermometers or the like, which are combined from one or more to form contact packages Contacts can exist which are in operative connection with a setpoint and actual value pointer, whereby a Switching cycle of the actual value pointer congruent with the setpoint pointer Location is brought.

Electromechanical contact devices are known whose functions are designed as make, break or changeover contacts. _{Contact packages} can contain individual or combined switching functions that are put together for the respective purpose in electrical control technology.

For example, if a pressure-dependent compressor control be made with a pressure gauge, a closing and a Offnungskontakt is required for the pressure gauge, the circuit in a relay latching '- drive. The closing contact is in operative connection with the setpoint pointer of the minimum pressure and the opening contact with the setpoint pointer of the maximum pressure. A release lever connected to the actual value pointer controls both contacts.

If the minimum pressure is reached, the actual value pointer comes with the setpoint pointer the minimum pressure in cover, the contact closes the circuit to the relay coil and the relay picks up - the compressor is switched on and pumps air. When the pressure increases, the normally open contact opens again because the actual value pointer is out of the range of the setpoint pointer wanders out. If the relay were not switched to self-holding, the circuit would be interrupted immediately without the maximum To achieve setpoint. The self-holding circuit means that the circuit only works when the actual value pointer is aligned with the setpoint pointer the maximum pressure is interrupted by the release lever opening the opening contact - the compressor is switched off. It is known to reverse the operation of the opening and closing contact with appropriate wiring.

For the above-described or other control purposes with the same functional sequence, it is disadvantageous that a voltage corresponding to the respective control Relay with self-holding circuit must be provided, including an additional closing contact on the relay, which the closing contact of the Measuring device bridges via an additional third wire of the control cable, is required. This circuit method causes one Additional expenditure on costs and installation work.

It is therefore the task of the innovation to develop a contact device,

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which enables a simpler circuit method and those described above Excludes disadvantages.

The object is achieved according to the invention in that a with the actual value pointer Via a driver pin connected contact both a closing and a also forms opening contact and the closing process of the contact by means of one at the minimum value pointer (maximum value pointer) by spring force loosely coupled locking lever, and the opening process by means of a stop rigidly arranged on the maximum value pointer (minimum target value pointer) takes place when the actual value pointer swivels into the position of the respective setpoint pointer, the opened contact by a, between the Contact half "B" and the driver pin arranged leaf spring against the one on the contact half "A" in the direction of the contact half "B" acting moment of a spiral spring and a permanent magnet the contact halves "A" and "B" during the return of the actual value pointer to at a distance from the stop on the locking lever.

An embodiment of the innovation is shown in the drawing and is explained in more detail below. Show it:

Figure 1 front view of a contact device

for measuring devices

Figure 2 top view of the contact device

Figures 1 and 2 represent the basic structure and the individual parts according to the usual contact device. The contact half is arranged on a metallic carrier plate and is pivotable about an axis (5) "A" of a known magnetic snap-action contact. The individual carrier plates (1) are screwed together via insulating contact carriers (22). The contact half "A" has an elongated hole (2) through which an am

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Actual value pointer (3) rigidly arranged made of insulating material Drive pin (4) through to the swivel plane of the contact half "B"

protrudes. On the minimum setpoint pointer (6) and on the maximum setpoint pointer (7) '-are Arranged stops (8, 9) made of insulating material, which into the pivot plane of the closing lever (10) or the contact half "B"

Ι protrude. A spiral spring (11) exerts a force on the closing lever (10) or

y the spiral spring (12) on the contact half "B" in such a way that the

, I closing lever (10) against the stop (8) and the contact hooks "B"

S against the moment of the leaf spring (21) against the driver pin (4)

_; v> must be pressed. These parts are therefore with the minimum setpoint

; | The pointer (6) and the actual value pointer (3) or the contact half "A" are loose

Ί coupled. Permanent magnets (13, 14) are attached to the contact half "A"

attached, the distance to the contact pin (15) is adjustable. the Axis (16) of the actual value pointer (3) is connected to a measuring device, not shown tied together.

To explain the functionality of the contact device according to the innovation it is assumed that the minimum setpoint pointer (6) and the maximum setpoint pointer (7) are set to a predetermined value is. If the actual value pointer (3) reaches the contact half "B" Area of the minimum setpoint pointer (6), the pin (17) pushes supported by the spiral spring (11, 12) and the attraction of the Permanent magnets (13, 14) after overcoming the counterforce of the spring (19) and the leaf spring (21) the contact pins (15, 18) on each other, whereby the contact is closed. Via a corresponding one connected to the contact halves "A" and "B" - in the drawing Cable, not shown, can flow and an electrical device to be controlled is switched on. This remains as long when switched on or the contact when closed, until the actual value pointer (3) swings into the area of the maximum setpoint pointer (^). The contact half "B" lies against the stop (9)

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and contact pins (15, 18) are abruptly detached from one another as a result of the spring (20) as soon as the contact half "B" with the actual value pointer (3) strides a lesser part above the maximum target value and the attractive force of the permanent magnet (13) is overcome. The electrical device to be controlled is switched off. The actual value pointer (3) gradually swivels back in the direction of the minimum value pointer (6). Due to the leaf spring (21) arranged between the contact half * 'ß " and the driver pin (4), the contact halves" A "B" or the contact pins (15, 18) during the return of the actual value pointer (3) into the range of the minimum setpoint pointer (6) at a distance, ie kept in the open state. Without the leaf spring (21), the contact pins (15, 18) would close as soon as the actual value pointer (3) falls below the set maximum target value.

Claims (1)

ι ι · • · · I · I Contact device for measuring devices such as manometers, thermometers and the like, which can consist of one or more contacts combined into contact packages that are linked to a setpoint value and actual value pointer are in operative connection, with the actual value pointer being congruent with the setpoint pointer to trigger a switching cycle f position is brought, characterized in that a with the '"Measured value pointer (3) connected via a driving pin (4) contact forms both a make and a break contact and the closing process of the contact by means of a locking lever loosely coupled to the minimum setpoint pointer (6) (maximum setpoint pointer 7) by spring force (10) and the opening process by means of a stop (9) rigidly arranged on the maximum setpoint pointer (7) (minimum setpoint pointer 6) takes place when the actual value pointer (3) swivels into the position of the respective setpoint pointer (6, 7), whereby the open contact is arranged between the contact half "B" and the driver pin (4) Leaf spring (21), the spring force of which is so dimensioned that it counteracts the movement from one to the contact half "A" in the direction of the contact half "B" Acting moment of a spiral spring and a permanent magnet (13) the contact halves "A" and "B" during the return of the actual value pointer (3) as far as it will go on the locking lever (10) at a distance. 7736112 11.0S.78