DE2601505C3 - Spring-loaded mounting bracket for electrical heating elements, especially on rail switches - Google Patents

Description

The invention relates to a resilient mounting bracket, as it is in particular for attaching electrical Heating devices such as heating rods or similar heating elements are used on the rail parts of a switch will.

Such brackets must not only be easy to assemble and replace, but also the Heat element convey a high contact pressure on the rail in order to achieve the best possible heat transfer to ensure. In addition, the bracket must have a relatively high resistance to the side Apply shifting on the rail, as the latter starts to vibrate when driven over.

From DE-AS 12 04 696 a mounting bracket is already known that the foot of the rail comprises resiliently and an electric heating rod with a free end reinforced by steel sheets presses the upper part of the rail foot. This mounting bracket probably largely fulfills the requirements Demands, but the cost of its production is relatively large and he also uses a great headroom under the rail foot ahead.

Another mounting bracket made known by DE-AS 16 58 307 avoids the aforementioned Disadvantages, however, with this bracket, the actual leg pressing on the heating element is proportionate long, so that large cross-sections must be used for the bracket in order to achieve a sufficient To obtain contact pressure on the heating element. This also applies to the contact pressure of the bracket as such against it the rail foot, which is decisive for the resistance of the bracket to lateral displacement.

In addition, DE-AS 11 83 928 discloses a Fastening bracket with a stretched, the rail foot without spacing and bracket-like from below encompassing clamping leg, which continues on one side in an upwardly curved pressure leg, the free end of which forms a contact surface for the heating element.

This mounting bracket from which the preamble of claim 1 is derived, is opposite to the next Ironing described above is much easier to manufacture, but again requires strong Cross-sections if a sufficiently secure fit on the rail is to be guaranteed.

It is the purpose of this invention to remedy this disadvantage and to provide a mounting bracket from the by the DE-AS 11 83 928 known type to create that already For material cross-sections of smaller thickness, a tight fit of the bracket on the rail and a ensures sufficiently high contact pressure on the heating element

For this purpose, according to the invention, the pressure leg is at its transition to the Klfimmschenkel with provided a cam-like bulge which is supported against the top of the rail foot.

This novel mounting bracket has the advantage that the cam-like bulge of the pressure leg A considerable contact pressure on the rail foot is achieved even with smaller material thicknesses becomes impermissible without thereby on the other hand the contact pressure of the leg end on the heating element changes

An advantageous development of this mounting bracket is described in claim 2.

An embodiment of the invention is illustrated in a single figure of the drawing, which will be explained below.

The mounting bracket, which is preferably made of chromium-nickel steel sheet, consists essentially of a clamp leg 1 that encompasses the foot Fder rail 5 on both sides in a clamp-like manner and a pressure leg 2 adjoining this leg 1 on one side, which with its free end 3 has a heating element H that is used to heat the rail 5 against the Rail presses.

The clamping leg 1, which is stretched in its middle part and thus rests essentially on the underside of the rail foot F , is bent upwards in a U-shape on both sides, the upstanding leg parts 4 and 5 at a certain angle of approximately 20 to 40 degrees α are overbend beyond the vertical. This design has the effect that the clamping leg 1 clings to the rail foot F with pretension and thus the desired resistance against lateral displacement of the bracket is achieved. This effect can be further enhanced by the fact that the end of the free upstanding leg part 4 is known per se. Way as a claw 6 forms.

The other upright leg part 5 merges into the pressure leg 2, which is arched upward like a bow and has a pressure surface 7 adapted to the shape of the heating element H at its free end 3.

In order to make the resiliently effective length of the pressure leg 2 as short as possible and thus stiff, the Leg 2 in the area of its transition from the clamping leg 1 with a cam-like bulge 8 provided with which the pressure leg 2 is supported on the top of the rail foot F. To this In this way it is achieved that the effective length of the spring is definitely related to the distance between the bulge 8 and contact surface 7 limited and thus the desired high contact pressure is achieved.

1 sheet of drawings

Claims (2)

Patent claims: 1. Spring-loaded mounting bracket for electrical heating elements, especially on rail switches, with a U-shaped, stretched in its middle part, the rail foot clamp-like without spacing encompassing clamping leg, which is continued on one side in an upwardly curved pressure leg, the free end of which forms the contact surface for the heating element, characterized in that that the pressure leg (2) is provided at its transition to the clamping leg (1) with a cam-like bulge (8), which braced against the top of the rail foot (Fig 2. Fastening bracket according to claim 1, characterized in that the upstanding parts (4, 5) of the U-shaped clamping leg (1) inwards by a certain angle (<x) over the vertical are bent over.