DE2430176A1 - SCREWLESS CLAMP - Google Patents

Description

The invention "relates to a screwless, as a structural unit trained clamp from a frame-shaped sheet metal body made of a square-shaped sheet metal strip with an entry opening for a conductor and a pressure piece in one side wall having.

Screwless terminals are used wherever electrical connections are safe and with the least amount of installation effort should be produced. In particular, screwless terminals are used in sockets and in installation switches. However, the problem is with the previous known screwless terminals the relatively high contact resistance between terminal and conductor, which is why inadmissibly high heating can occur at higher currents due to the voltage drop.

In the case of some types of screwless terminals, the pressure of the conductor on the contact part results in a line-shaped terminal at best Contact zone reached in the longitudinal direction of the conductor. With other screwless terminals, the conductor is turned into a corrugated prismatic surface pressed. However, such a clamp cannot be used at higher currents either insert. There are also known clamping devices which provide the conductor with notches when clamping be introduced by the pressure piece or holding part.

The invention has for its object to provide a screwless clamp which, while avoiding the described

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Disadvantages allows it to be used at higher currents of around 16A, which is especially true for sockets
important is.

The described object is achieved according to the invention
solved that the insertion opening opposite the clamping wall for the imaginary extension of the between them
enclosed base wall an angle smaller or
equal to 45 ° and that the clamping wall includes a sharp-edged recess in the form of a spaced above the
Has base wall standing V, in its upper area
an elongated pressure piece is mounted, which engages by means of an over the edges of the V-shaped recess
Spring is pressed against the edges. In this clamp, an inserted conductor is lifted up to the V-shaped recess by deflecting it and then against its edges
pressed so that they memorize themselves in it. However, it is essential that the shape at an angle to the conductor cross-section creates a good contact on its circumference, which is still supported by the pressure piece.

The invention is to be explained in more detail on the basis of an exemplary embodiment shown roughly schematically in the drawing will:

In Figure 1, the screwless clamp, shown partially in section, is shown in side view.

In Figure 2, the clamp is shown in a view from the front side, the clamping wall, without pressure piece and spring.

In Figure 3, the terminal is shown in the manner of the view according to Figure with inserted conductor.

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In FIG. 4, the clamp according to FIG. 3 is shown in an end view from the clamp wall. The view according to Figure 3 results from FIG. 4 with a partial section along III-III.

The screwless clamp according to FIG. 1 is designed as a structural unit and has a frame-shaped sheet metal body 1, a pressure piece 2 and a spring 3 from an angularly bent sheet metal strip. An insertion opening 4 for a conductor to be connected is formed in one side wall.

The clamping wall 5 opposite the insertion opening 4 closes for the imaginary extension of the one enclosed between them Base wall 6 an angle oO ^ 45. In the clamping wall 5 has a sharp-edged recess 7 in the form of a V standing at a distance above the base wall 6. In the upper area of this V-shaped recess 7, an elongated pressure piece 8 is mounted. By means of a The pressure piece 8 is pressed against the edges 9 via the edges 9 of the V-shaped recess 7 engaging the spring 3.

In Figure 2 is the clamp of Figure 1, but without a pressure piece 2 and spring 3 when viewed from the clamping side 5 is shown. The edge 9 of the V-shaped recess 7 is located at its lowest point, it can still be seen somewhat above the inner boundary surface of the base wall 6.

A conductor 10 to be connected, which can be found in the terminal according to FIG. 3 in the insertion opening 4 in the direction of the arrow introduces, is lifted away with its end 12 over the sharp edge 9, so that it against the base wall 6 at least is roughly exposed, as can be seen from FIG. The pressure piece 2 presses the conductor 10 against the oblique to his Cross-section standing V-shaped profile of the recess 7. It is advantageous if a spring on the pressure piece 2 is possible

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engages over the edge 9, as in the exemplary embodiment is illustrated.

As can be seen from the illustration according to FIG. 4, the position of the end piece 12 of a conductor to be inserted depends on its cross-section.

In practice, the sharpness of the edges is sufficient, as is the case with punching the recess 7 is achieved. However, it is advantageous if the edge 9 is still sharpened or hardened somewhat.

1 claim
4 figures

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Claims (1)

- 5 - VPA 74/4051 Claim Screwless clamp designed as a structural unit made from a frame-shaped sheet metal body made from a sheet-metal strip bent at an angle, which has an insertion opening for a conductor and a pressure piece in a side wall, characterized in that, that the insertion opening (4) opposite Clamping wall (5) for the imaginary extension of the base wall (6) enclosed between them an angle smaller or equal to 45 ° and that the clamping wall (5) has a sharp-edged recess (7) in the form of a spaced apart has a V standing above the base wall (6), in the upper region of which an elongated pressure piece (8) is mounted, which is pressed against the edge (9) by means of a spring (3) engaging over the edges of the V-shaped recess (7) will. 509883/0035 Blank page