DE2604219A1 - FLAT FORK SPRING - Google Patents

Description

DR. SOLF & ZAPF PATENTANWÄLTE

DR.-ING. DIPL.-ING. A. SOLF DIPL.-INQ. CHR. ZAPF

56 Wuppertal ι Wall 27/29

Patent application P.O. Box 130219

^ö Il / p / 360

Grote S- Hartmann, 56 Wuppertal 21, Am Kraftwerk I3

Flat fork spring

The invention relates to a flat fork spring from a Stamped sheet metal part, essentially consisting of a conductor claw part and a contact part, the contact part having a Has holding box with spring arms.

Flat fork springs of known type are usually either designed as so-called beak springs or as fork springs with inwardly bent spring arm ends. Beak feathers have a soft spring characteristic and a relatively large finding funnel, but small spring forces and are not sufficiently elastic against overbending. Fork springs with inwardly curved spring arm ends usually have to be equipped with an over-spring and then do not have such a soft spring characteristic, but high spring forces and a higher resistance to overbending. Your research area on the other hand is small. Since the latter lacks housing support for the spring arms, there are also overbends

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not be ruled out. Both with beak feathers as well With springs of the other type, the contact pressure can vary, which leads to incorrect electrical values can. On the other hand, the housing catches are usually in the middle part of the electrical connector and are therefore hard to access.

The object of the invention is therefore to avoid the disadvantage known fork springs to create a flat fork spring whose Contact pressure increases with tensile load on the cable and which at the same time supported against exceeding the spring travel is.

This object is achieved according to the invention by a flat fork spring solved the type described above, which is characterized in that the spring arms of the contact part at a distance extend to each other in an extension of the side walls of the holding box and the spring arm ends like an eyelet outwards and backwards are bent, with at least one peder arm a backward-facing detent spring is connected in one piece.

Further essential features of the invention contain the characterizing features Parts of the subclaims.

The invention is explained in more detail with reference to FIGS. 1 to 3.

Show it:

Fig. 1 is a plan view of the Flachgabelf eider,

2 shows a side view of the flat fork spring,

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Fig. 3 a. Section along C-D in FIG. 1, FIG. 4 a section along E-F in FIG. 2.

The flat fork spring according to the invention consists of the U-shaped curved ladder claw part 1 with insulation claw 2 and wire claw 3. The insulation _{claw 2 has a claw base 4 urK} i claw arms 5 and 6; the claw 3 also has a claw base 7 and claw arms 8 and 9. The bevels 10 of the claw arm ends are used to securely anchor the arms in the conductor or in the insulation after they have been attached. The insulation claw 2 is also enforced with respect to the conductor claw 3 at 11 to insulation jacket thickness.

A connecting part 12, which is also bent in a U-shape, adjoins the ladder claw 3, which has a supporting, stabilizing transition of the ladder claw 3 to the holding box 13 creates. It consists of the bottom 14, the two side walls 15 and 16 and the inwardly curved ceiling parts 17 and 18. The two ceiling arches 17/1 & are supported against each other and thereby give the box 13 a high level of stability. The ceiling arches 17/18 have bevels 19, which act as a finding for a mating connector and for it

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ensure that the contact pin does not hit an edge when plugged in.

The fork spring arms close to the holding box 13, namely in extension of the side walls 15 and 16 each with a Federarrn 20 and 21. The spring arms are at the base (at 22) after inm-n enforced and run straight towards each other. In her hand area the spring arms are bent outwards and backwards like eyelets and form the eyelets 2 3 and 24. The eyelets initially have Inner arcs 2 5 and 26 that butt against each other at 27. The inner arches 2 5/26 merge into the upper arches 28/29 which are bent back parts 30 and 31 of the spring arm ends connect. The detent spring 32 is connected to the spring arm end 31. This locking spring is used to lock the housing and runs conically towards the end so that it does not get stuck in the housing when the flat fork spring is inserted.

The combination of the detent spring with the fork spring bent outwards and backwards at the arm ends enables on the one hand secure locking in the fork spring area, from the front or the outside is usually easily accessible, and on the other hand ensures a contact pressure on the contact pin that is equivalent the tensile load becomes greater. The bent back part 30 supports

is in the housing and prevents together with the locking spring base 31 exceeding the spring travel.

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According to a particular embodiment of the invention, the fork spring arm ends have to enlarge the finding area an approximately square pre-opening 33. This pre-opening is formed by the penetrations 34 and 35, which are in extension of the spring arms run in alignment until they merge into the respective upper arch. This ensures that the Contact point does not move when inserting the contact pin.

The flat fork spring according to the invention thus ensures a secure locking in the housing, high spring forces with increasing contact pressure with increasing load, is protected against Exceeding the spring travel and still has a relatively soft spring characteristic and a relatively large search range.

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Claims (11)

EXPECTATIONS 1 '., Flat fork spring made from a stamped sheet metal part, essentially i
- ""'borrowed consisting of a ladder claw part and a contact part, the contact part having an Ilaltekasten with spring arms, characterized in that the spring arms (20 / *.' 1) of the contact part at a distance from one another in the extension of the side walls (15/16 ) of the holding box (13) and the ends of the spring arm are bent outward and backward like an eyelet, with a backward-pointing detent spring (32) adjoining at least one spring arm. 2. Flat fork spring according to claim 1, characterized by an approximately square pre-opening (33), uie is formed by penetrations (34/35). 3. Flat fork spring according to claim 2, characterized in that that the enforcements (34/35) extend in line with the spring arms (20/21) . 4. Flat fork spring according to one or more of the claims 1 to 3, characterized in that the holding box (13) from the bottom (14) with the two Side walls (15/16) and the inwardly curved ceiling parts (I7 / I8). 709832/0067
ORIGINAL INSPECTED 5. Flat fork spring according to claim 4, characterized in that g c - indicates that the two ceiling parts (17/18) are resiliently supported against each other and as Shape stabilizers act 6. Flat fork spring according to claim 4 and / or 5, d a d u r c h marked that the ceiling arches (i? / lö) Have bevels (19). . Flat fork spring according to one or more of the claims 1 to 6, characterized in that that the spring arms (20/21) are connected to the holding box (13) are enforced internally. 8. flat forked spring according to one or more of claims 1 to 7, characterized in that the spring arm ends eyes (23/24) with Ixiiienbögen (25/26), which abut against each other in (27) _r form. 9. Flat fork spring according to claim 8, characterized in that g e k indicates that the inner arches (2 5/26) merge into the upper arches (28/29), to which the bent back Connect parts (30 / 3I) of the spring arm ends. 709832/0067 10. Flat fork spring according to claim 8 and / or 9, characterized characterized in that the locking spring (32) is connected to the spring arm end (31) and the locking spring for Tapered towards the end. 11. Flat fork spring according to one or more of the claims 1 to 10, characterized in that on the U-shaped curved ladder claw part (1) a connecting part (12) which is also bent in a U-shape is connected. 709832 / Ü067