DE8511344U1 - Contact socket for electrical sockets with a screwless connection terminal - Google Patents

Description

Merten brothers
GmbH & Co. KG

Contact socket for electrical sockets with a screwless connection terminal

The invention relates to a contact socket for electrical sockets with a screwless terminal in which the contact socket and the terminal cage are made from a common, approximately U-shaped sheet metal blank, of which Longitudinal limbs around the transverse limb against one another by 90 ° and the free ends of the longitudinal limb are bent inwards by 180 ° are, wherein the bent resilient ends of the legs each have an approximately semicircular widening, which complement each other to an insertion opening for a plug pin, and in that from the parallel wall parts the two longitudinal legs and the transverse leg formed terminal cage a two-legged leaf spring is housed, the clamping legs in cooperation with the transverse leg designed as a contact plate through openings in the wall of the terminal cage Clamp bare conductor ends introduced into its interior like a barb.

From DE-PS 2 201 883 a similar contact socket has become known in which the leaf spring on the semicircular Extensions of the free ends of the longitudinal legs attached to adjoining extensions and V-shaped is. This known contact socket requires a very precise and complex manufacturing process. Further the inserted conductor ends are only passed through an insertion opening at one end, namely on the front side. Accordingly, the conductor can jump out of the bead guide at the rear end, which leads to an increased over-

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input resistance at the terminal point.

In switch terminals according to DE-OS 2 748 273, it is known to provide a double guide for the conductor ends, in that the switch contact is angled twice and forms approximately parallel legs, each with two adjacent ones Bores are provided for the passage of the wire ends, being angled at the front Leg a flat leaf spring is attached by folding.

From DE-PS 1 900 448 a screwless terminal for junction, in particular stove connection boxes is known in which the middle limb of the leaf spring, which is bent in an S-shape, has extensions with which the spring is inserted into slots in the housing walls intervenes.

The object of the invention is to improve the contact socket Ί5 of the type described at the beginning, that it is easy to manufacture and has a low contact resistance having at the clamping point.

According to the invention, the object is achieved with a contact socket of the type described above solved by the measures listed in the characterizing part of the main claim. Advanced training of the invention are described in the subclaims.

In the inventive design of the contact socket a double guidance of the conductor and a secure mounting of the leaf spring is achieved in a simple manner, since the Heavily loaded clamping end of the leaf spring cannot loosen even in the long run and a decrease in the spring force is avoided.

Due to the trapezoidal design of the leaf spring according to Claim 2 can increase the contact pressure of the terminal.

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j According to claim 3, the leaf spring can with the help of a release; Tool to be lifted.

! · Below is an exemplary embodiment based on the drawing ; the invention described in more detail. Show it:

5 Figure 1 shows a section through the contact socket j along the line c-d in Figure 4,

FIG. 2 shows the side view of the contact socket according to FIG. 1,

; FIG. 3 shows the top view according to FIG. 1,

; 10 Figure 4 shows a section through the contact socket along the line a-b in Figure 1,

if Figure 5 is the leaf spring of the clamp,

> Figure 6 shows a deflection diagram for the

(Leaf spring according to Figure 5.

The contact socket 7 and the terminal cage 8 of the screwless Terminal are made from a common, approximately U-shaped sheet metal blank, the longitudinal leg 9 around the Transverse leg, which is designed as a contact plate 10, are bent by 90 °. The contact plate 10 points in the longitudinal direction two parallel adjacent beads 11 for the connecting conductor 12.

The free ends of the longitudinal legs 9 are bent inwardly by 180 ° to form a radius, the bent over resilient ends of the legs each have a semicircular enlargement 13, which leads to an insertion opening 14 for a connector pin.

Between the parallel wall parts 15 of the longitudinal legs 9 a two-legged, completely flat leaf spring 16 is arranged. The leaf spring 16 has on the long sides Support webs 17 with which it is inserted into retaining slots 18 of wall parts 15. The retaining slots 18 are arranged at an acute angle to the contact plate 10, so that the clamping legs 19 of the leaf spring 16 in the guide beads 14 engage the contact plate 10 and clamp the connection conductor 12 barbsai'tig.

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In order to improve the routing of the connecting conductor 12, tabs 20 with notches 21 are provided on the longitudinal legs 9 integrally formed and bent at right angles so that the terminal 8 in the insertion direction at that of the insertion opening 14 for the end facing away from the connector pin is completed and through the notches 21 two adjacent, with the beads 11 aligned, insertion openings 22 for the Connection conductors 12 are formed. Likewise is on the transverse leg or the contact plate 10 has a tab 23 formed with notches 24 and bent at right angles so that the terminal 8 on that of the insertion opening 14 for the plug pin adjacent end is completed and through the notches 24 two adjacent, with the Corrugations 11 aligned, push-through openings 25 for the connection conductor 12 are formed.

As can be seen from Figure 5 of the drawing, the clamping legs are 19 of the leaf spring is trapezoidal. This means that the same thing always acts over its entire effective length Bending stress.

In Figure 6, a deflection diagram is calculated for a trapezoidal and a rectangular clamping leg with the specified dimensions. From this it can be seen that, for example, a 0.25 mm thick spring steel sheet is required for the rectangular clamping leg B for a required deflection of the fec / jr leg A or B of 1 mm. The associated value of the contact pressure P is 14 N. If you want to increase the contact pressure with this rectangular clamping leg B by using thicker spring steel, e.g. 0.3 now, this is only possible at the expense of the deflection, which is then at an achievable contact pressure P of 20 N is only approx. 0.8 mm. With a conductor cross-section of 1.5 mm ² , this spring would already be overloaded. For the trapezoidal clamping leg A, however, 0.3 mm thick spring steel sheet can be used for the clamping leg with a deflection of 1 mm for the clamping leg with 20 N contact pressure.

With the same deflection, the contact pressure is the - .., 7 .-

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trapezoidal leaf spring A compared to the rectangular Leaf spring B is 30% higher.

To apply a release tool, release tabs 26 can be attached to the outer or inner free end of the clamping legs 19 be molded.

For fastening the contact socket within a housing recess are from the wall parts 15 resilient tongues 2 7 issued, which snap into place behind recesses in the housing recess.

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Claims (3)

1 - ι j ζI 3 13 J JIT • B I j • I JIJ} 3 1 3 11 Brothers Merten GmbH & Co. KG Protection claims: 1.) Contact socket for electrical sockets with a screwless Terminal in which the contact socket and the terminal cage are made from a common, approximately U-shaped sheet metal blank are made, the longitudinal legs around the transverse leg against each other by 90 ° and the free ends öer longitudinal legs are bent inwards by 180 °, the bent resilient ends of the legs each being approximately semicircular Have expansion that leads to an insertion opening for the plug pin, and in the one formed from the parallel wall parts of the longitudinal limb and the transverse limb Terminal cage accommodates a two-legged leaf spring, the clamping leg of which m? t that formed as a contact plate transverse legs which through insertion openings in wall parts of the terminal cage in clamp the interior of the bare conductor ends introduced like a barb, characterized in that the Terminal cage in the direction of insertion of the conductor ends (12) ! at the front and back of the longitudinal and / or Transverse legs (9,10) angled tabs (20,23) is limited, the conductor entry openings lying one behind the other in pairs (22,25), and the completely flat leaf spring (16), known per se, on the long sides its fastening end has protruding bearing webs (17) j, with which they in, at an acute angle to the contact plate (10) arranged, holding slots (18) of the wall parts (15) of the longitudinal legs (9) is used. 2.) Contact socket for electrical sockets with a screwless one Clamp according to claim 1, characterized in that r .2, .. r. , ·· ■ I I 1 I ■ 4 I _ · 1 111 • BII 1 1 I I t * iiiiii) ι ■ 111) i ι • · ι ι ι ι ι > the clamping legs (19) of the leaf spring (16) are trapezoidal are. 3.) Contact socket for electrical sockets with a screwless Clamp according to Claim 1 or 2, characterized in that the clamp legs are at the inner or outer free ends (19) release tabs (26) are integrally formed.