DE202018104336U1 - Electrical installation device with a clamping screw - Google Patents

Abstract

Electrical service switching device (1), comprising a housing (2), with a terminal (3) held in a terminal receiving space of the housing, the terminal (3) comprising
- A clamping frame (4) which encloses a clamping space (5) on three sides and which is displaceably guided in the terminal receiving space between an open position and a closed position,
a clamping screw (6) which is guided and held in a screw-threaded manner in a threaded opening of the clamping frame (4),
- A housing fixedly held busbar (7), which forms a further boundary side of the clamping space (5) and against which an end portion of the clamping screw (6) is articulated, characterized in that
on the housing side a slotted guide (9) for positive guidance of the clamping frame (4) is formed in its direction of displacement,
- The link guide has a constriction (8), wherein the constriction (8) is designed so that the constriction (8) the clamping frame (4) in its forced operation in the open position into a resistance, and wherein after moving the clamping frame (4 ) in its open position, overcoming the resistance of the constriction (8), the clamping frame (4) through the constriction (8) held in its open position and prevented from arbitrary shipment from the open position out.

Description

The invention relates to an electrical service switching device according to the preamble of claim 1. The invention can be used for example in circuit breakers and motor protection switches.

A generic electrical service switching device has a housing, with a terminal held in a terminal receiving space of the housing, wherein the terminal comprises a clamping frame, which encloses a clamping space on three sides and which is slidably guided in the terminal receiving space between an open position and a closed position. Further, the terminal comprises a clamping screw, which is guided and held schraubverschieblich in a threaded opening of the clamping frame. A busbar fixed to the housing forms a further boundary side of the terminal space. Against this busbar is an end piece of the clamping screw can be articulated.

Installation switching devices of the type mentioned are well known. They are used to switch one or more current paths or to protect one or more current paths in particular thermal overload by an increased short-circuit current that exceeds the rated current of the service switching device by a multiple, or by over a longer period of time pending overcurrent, the rated current of the service switching device only slightly exceeds. Also, to protect against other errors in the circuit installation switchgear of the type mentioned can be designed, for example, to protect against thermal overloading of the current path due to poor contact points, or for the protection of persons in contact with live parts. Inside the housing of the service switching device, the modules required for exercising the intended function modules or modules are housed, such as contact points with contact carrier and contact levers, trip units, arc quenching devices, corresponding wiring, and possibly also sensors for detecting the switching state or status information, and communication devices for transmitting this information to a higher level information processing unit.

Such a service switching device is electrically connected to the current path to be monitored via connection terminals. Widely used are terminals of the type of a screw terminal with a movable clamping frame.

An example of a service switching device with such a screw is in the DE 10 2008 050 929 A1 shown.

In generic service switching devices is in the delivery state at the customer, the terminal usually not in a defined state. Depending on how it leaves the factory, it may be closed, half open or fully open. When the terminal is halfway or fully open, the terminal frame may reciprocate in the terminal receiving space. If a user of a generic service switching device installs this in an electrical installation device, for example, snaps into a house distribution box on a hat profile support rail and then connecting connecting conductors or busbars, he must first bring the terminal in a defined opening state. This is an additional step that is laborious.

The present invention has for its object to provide a generic service switching device, in which the terminal held in a defined open position and a displacement of the terminal frame can be prevented when the terminal is open.

This object is achieved in conjunction with the features of the preamble according to the invention by the features specified in the characterizing part of claim 1.

According to the invention, a slide guide for positive guidance of the clamping frame is formed in the direction of displacement on the housing side, and the slotted guide has a bottleneck, wherein the bottleneck is designed so that the bottleneck opposes the clamping frame in its forced operation into the open position into a resistance, and wherein after spending the clamping frame in its open position, overcoming the resistance of the bottleneck of the clamping frame is held by the bottleneck in its open position and prevented from arbitrary shipment from the open position.

Surprisingly, it was recognized that the clamping frame is always held in the same open position by a housing-side slotted guide. The bottleneck effectively creates a detention point at the end of the scenery. This latching point can be overcome in wiring, so if the clamping screw is rotated in the direction of the closed position of the terminal by a light force exerted, for example by pressing the clamping screw by means of a screwdriver, the clamping frame is then released again and the user can clamp a lead inserted into the terminal compartment therein.

According to an advantageous embodiment of the invention, the slide guide is formed by pairwise opposite projecting wall parts respectively webs.

According to an advantageous embodiment of the invention, the clamping frame is formed with longitudinal limbs, which are formed by two mutually parallel, spaced-apart part-legs, and which are interconnected by a lower transverse leg and held together.

According to an advantageous embodiment of the invention, the distance between the pairwise opposite wall parts or webs in the region of the side walls of the clamping space extending parallel to the longitudinal legs is selected such that the part legs can slide along therebetween.

According to an advantageous embodiment of the invention is in the region of the transition between the parallel to the longitudinal limbs extending side boundary walls and extending parallel to the lower transverse leg lower boundary wall of the clamping space, the distance between the pairwise opposite wall parts or webs smaller than the width of the Part-leg, whereby the space of the slotted guide is narrowed here and creates a bottleneck.

According to an advantageous embodiment of the invention, the bottleneck is designed so that it opposes the clamping frame in the positive guidance in the open position into a resistance, after overcoming the clamping frame is held by the bottleneck in its open position.

Further advantages and advantageous embodiments of the invention are characterized in the subclaims.

• 1 schematisch und exemplarisch einen Ansicht auf die Schmalseite eines erfindungsgemäßen Installationsschaltgerätes im Bereich der Anschlussklemme,
• 2 schematisch und exemplarisch eine Ansicht von unten auf den erfindungsgemäß in einer Kulissenführung des Gehäuses zwangsgeführten Klemmenrahmen.

The invention will be explained below with reference to an embodiment shown in the drawings. Show it:

• 1 schematically and by way of example a view on the narrow side of a service switching device according to the invention in the region of the terminal,
• 2 schematically and exemplarily a view from below of the present invention in a gate guide of the housing positively driven terminal frame.

1 shows schematically and exemplarily a view on the narrow side of a service switching device 1 in the area of a connection terminal.

The service switching device 1 has a housing 2 , The housing is constructed in the example shown here in shell construction. It is made of two half shells 10 . 11 , which are joined together along a joint line, composed. The two half-shells are made of a thermoplastic or a duroplastic and are manufactured in an injection molding process. Alternatively, they could also be made by 3D printing.

On each of the narrow sides of the housing is a terminal receiving space. Here in the 1 the view on the terminal receiving space of one of the narrow sides is shown by way of example.

In the terminal receiving space is a terminal 3 held. The terminal 3 is designed in the form of a screw. This has a clamping frame 4 , a clamping screw 6 and a power rail 7 ,

In the presentation of the 1 If the connection terminal is in the open position, ready to insert a connecting conductor.

The busbar 7 is stored firmly in the housing. The clamping frame 4 is relative to the busbar 7 longitudinally displaceable stored and guided in the housing. The clamping screw 6 is here exemplarily designed as a cylinder head screw. She has on her screw head 12 an engagement opening 13 For example, as shown here a slot 13 , In the slot 13 can be used to operate the clamping screw 6 a tool, in particular a screwdriver, engage. The housing has an engagement opening at a corresponding location 14 through which the screwdriver of the clamping screw 6 can be supplied. The free diameter of the engagement opening is slightly smaller than the outer diameter of the screw head, so that the clamping screw is held captive in the terminal receiving space.

The clamping screw 6 wears on her shaft 15 a screw thread 16 , The clamping frame 4 has at its upper, the clamping screw facing legs 17 a corresponding mating thread into which the clamping screw is screwed. The screw head 12 opposite end 18 the clamping screw 6 relies on the power rail 7 from.

The clamping frame 4 still has two longitudinal legs 19 . 20 and a lower transverse leg 21 , The two longitudinal legs 19 . 20 and the lower transverse leg 21 enclose at three Pages the terminal space 5 , The busbar 7 forms the fourth boundary side of the terminal space 5 ,

To close the clamp, the clamping screw 6 twisted by means of the screwdriver. As you see the bottom 18 at the busbar fixed to the housing 7 is hinged, results in a displacement of the clamping frame 4 upwards, towards the intervention opening 14 out. The lower transverse leg 21 of the clamping frame 4 approaches the power rail 7 , one between the busbar 7 and the lower transverse leg 21 in the terminal room 5 introduced lead is finally in the terminal compartment 5 clamped.

In each of the two housing halves 10 . 11 a sliding guide is formed for positive guidance of the clamping frame 4 during his displacement movement.

I'll do that 2 considered. 2 shows the view from below of the present invention forcibly guided in a slotted guide of the housing terminal frame 4 , In the exemplary embodiment shown here, the longitudinal limbs 19 . 20 of the clamping frame by two mutually parallel, spaced-apart part-leg 19a . 19b . 20a . 20b educated. The partial thighs 19a . 19b . 20a . 20b be through the lower transverse leg 21 connected and held together.

Each of the partial thighs 19a . 19b . 20a . 20b is forcibly guided in a partial slotted guide. Each of the partial link guides is characterized by two opposing projecting wall parts respectively webs 22a . 22b . 23a . 23b . 24a . 24b . 25a . 25b educated.

The distance between the pairs of opposite wall parts or webs 22a . 22b ; 23a . 23b ; 24a . 24b ; 25a . 25b is in the area parallel to the longitudinal legs 19 . 20 extending lateral boundary walls of the terminal space 5 so chosen that the partial thighs 19a . 19b ; 20a . 20b can lead along between them. By thus opposing scenes in the housing parts twisting and jamming of the clamping frame is prevented in its forced operation in the open or closed position inside.

In the area of the transition between the parallel to the longitudinal legs 19 . 20 extending lateral boundary walls and parallel to the lower transverse leg 21 extending lower boundary wall of the terminal space 5 is the distance between the pairwise opposite wall parts or webs 22a . 22b ; 23a . 23b ; 24a . 24b ; 25a . 25b smaller than the width of the partial thighs 19a . 19b ; 20a . 20b , The space of the housing scenes is narrowed here. It creates a bottleneck 8th , The bottleneck 8th is designed to fit the clamping frame 4 in its forced guidance opposes a resistance in the open position. It will reach a Einrastpunkt. By further opening the frame, by further forced guiding of the frame in the open position, over the Einrastpunkt away, the Einrastpunkt is overcome. After moving the clamping frame 4 in its open position, overcoming the resistance of the bottleneck 8th , is the clamping frame 4 through the bottleneck 8th held in its open position, as in the 1 and is prevented from arbitrarily moving out of the open position. By further opening the clamp thus the locking point has been overcome and the clamping frame is through the constriction 8th held in his position in the open position.

When closing the clamp, the clamping frame, driven by the screwing force, in turn overcomes the constriction 8th on his way up to the closed position.

LIST OF REFERENCE NUMBERS

1

switchgear

2

casing

3

terminal

4

clamping frame

5

terminal space

6

clamping screw

7

conductor rail

8th

bottleneck

9

link guide

10

half shell

11

half shell

12

screw head

13

slot

14

engagement opening

15

screw shaft

16

screw thread

17

Upper leg of the clamping frame

18

End of the clamping screw

19

longitudinal leg

19a

Part-leg

19b

Part-leg

20

longitudinal leg

20a

Part-leg

20b

Part-leg

21

Lower transverse leg

22a

wall part

22b

web

23a

web

23b

wall part

24a

wall part

24b

web

25a

web

25b

wall part

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008050929 A1 [0005]

Claims (6)

Electrical service switching device (1), comprising a housing (2) with a terminal (3) held in a terminal receiving space of the housing, the terminal (3) comprising - a clamping frame (4) enclosing a terminal space (5) on three sides and which is slidably guided in the terminal receiving space between an open position and a closed position, - a clamping screw (6) which is schraubverschieblich guided and held in a threaded opening of the clamping frame (4), - a busbar fixedly held busbar (7), the further limiting side the clamping space (5) forms and against which an end piece of the clamping screw (6) can be articulated, characterized in that - on the housing side a sliding guide (9) for positive guidance of the clamping frame (4) is formed in its displacement direction, - the sliding guide a bottleneck (8 ), wherein the constriction (8) is designed so that the constriction (8) the clamping frame (4) in whose Zwangsführu ng in the open position into a resistance opposes, and wherein after moving the clamping frame (4) in its open position, overcoming the resistance of the constriction (8), the clamping frame (4) through the constriction (8) held in its open position and at one arbitrary shipment from the open position is prevented. Electrical service switching device (1) according to Claim 1 , characterized in that the slotted guide (9) is formed by mutually opposite projecting wall parts respectively webs (22a, 22b, 23a, 23b, 24a, 24b, 25a, 25b). Electrical service switching device (1) according to Claim 2 , characterized in that the clamping frame (4) with longitudinal limbs (19, 20) is formed, which are formed by two mutually parallel, spaced-apart part-leg (19a, 19b, 20a, 20b), and by a lower Transverse legs (21) are interconnected and held together. Electrical service switching device (1) according to Claim 3 , characterized in that the distance between the pairwise opposite wall parts or webs (22a, 22b, 23a, 23b, 24a, 24b, 25a, 25b) in the region of the side walls of the parallel to the longitudinal legs (19, 20) extending Clamping space (5) is selected so that the part-legs (19a, 19b, 20a, 20b) can guide along between them. Electrical service switching device (1) according to Claim 3 , characterized in that in the region of the transition between the parallel to the longitudinal legs (19, 20) extending lateral boundary walls and parallel to the lower transverse leg (21) extending lower boundary wall of the clamping space (5), the distance between the pairwise opposite Wall parts or webs (22a, 22b, 23a, 23b, 24a, 24b, 25a, 25b) is smaller than the width of the part legs (19a, 19b, 20a, 20b), whereby the space of the slotted guide (9) narrows here is and a bottleneck (8) arises. Electrical service switching device (1) according to Claim 3 , characterized in that the constriction (8) is designed so that it provides resistance to the clamping frame (4) in the positive guidance in the open position, after overcoming the clamping frame (4) held by the constriction (8) in its open position is.

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