Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
  • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
  • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/02—Contact members
  • H01R13/193—Means for increasing contact pressure at the end of engagement of coupling part, e.g. zero insertion force or no friction
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R2103/00—Two poles

Definitions

• the invention relates to an electrical connector with at least one contact element, which contains contact segments that can be expanded against each other, and with a tensioning device for spreading the contact segments.
• the electrical contact resistance between the plug connector and the socket should be as low as possible.
• the contact resistance is considerably reduced if the current-carrying contact surfaces are pressed against one another with high contact pressure.
• a secure mechanical connection of the plug connector to the plug socket is achieved by bracing the plug connector in the plug socket.
• the advantages of the above-described connector lie in the fact that the contact pin can easily be inserted into a socket in the unclamped state, because the outer circumference of the contact pin in the unclamped state is smaller than the inside diameter of the socket.
• the contact segments are spread by screwing in the clamping pin. The contact segments are pressed against the inner contact surface of the socket, thereby ensuring a secure electrical and mechanical connection.
• a major disadvantage of the plug connector described above is that between the conical surfaces of the dowel pin and the blind bore in the contact pin, when bracing occurs, both in the circumferential direction and axially static and sliding friction.
• the radial clamping force that can be transferred to the contact segments is limited by the friction losses.
• a torque is transmitted to the connector body and the contact pin when the dowel pin is screwed in.
• the operating personnel must use both hands when bracing. Handling is therefore cumbersome and time-consuming. If the hands and / or the gripping surfaces of the dowel pin are damp or dirty, the fingers slip slightly when the dowel pin is screwed in and sufficient tensioning of the plug connector is not possible. This problem is particularly important when a greater tension is to be achieved, for example when plug connectors are heavily used in recording studios or for outdoor use. Then even the use of tools for tightening the plug connector is sometimes unavoidable.
• the object of the invention is to provide an electrical connector which is easier and easier to handle. Larger clamping forces should also be able to be transmitted securely to the contact elements and be reliably transmitted even when used frequently. In addition, the manufacturing effort should be less.
• the invention proposes, based on the preamble of the main claim, that the contact element is assigned a deformable cushion which is compressible in one direction by the tensioning device, thereby expanding in the other directions and spreading the contact segments .
• the force is transmitted from the operating element of the tensioning device to the contact segments which can be expanded against one another via a deformable cushion.
• This pillow can be made of a deformable soft polymer, for example. Will that If the pillow is deformed in one direction by the tensioning device, it expands in the other spatial directions. If the free expansion of the cushion is restricted by the plug housing, the static pressure exerted by the surface of the cushion can be used specifically and evenly to spread contact segments.
• the cushion can have any shape, which makes it possible to transmit the actuating force evenly to contact elements of any shape, almost without loss.
• the contact segments can be spread out in any predetermined directions, for example depending on the shape of the connector to the outside - as in the case of the banana connector - or inwards - as in the case of the cinch connector.
• the connector according to the invention it is very advantageous that the sliding surfaces of the tensioning device rubbing against one another are eliminated.
• the mechanical efficiency of the tensioning device is very high because the actuating force of the tensioning device is transmitted quasi-hydraulically by the cushion and almost no mechanical friction can be overcome during tensioning. Due to the quasi-hydraulic functional principle, very high contact pressures can be achieved between the corresponding contact surfaces even by very low operating forces.
• the power transmission ratio can be chosen as desired within very wide limits.
• the achievable contact pressures are an order of magnitude greater than in the case of clamping devices according to the prior art.
• the manufacture of the connector according to the invention does not require a highly precise design of conical surfaces, nor does it require any special surface coating. Furthermore, the tensioning device does not require threaded bores. The manufacturing effort and thus the costs are thus significantly reduced.
• the tensioning mechanism can no longer seize.
• the plug connection can be released at any time simply and safely by relaxing the cushion.
• the operational reliability and long-term reliability are significantly increased.
• the pillow is also very durable even under rough conditions of use and with frequent actuation if it is made of modern synthetic polymer materials.
• an advantageous embodiment of the electrical connector provides that the tensioning device has a lockable actuating lever which can be manually shifted in a longitudinal plane of the connector and to which a tensioning element acting on the cushion and displaceable in its longitudinal direction is connected, through which the cushion rests against an abutment is pressable.
• This embodiment is particularly suitable for use in single-pole or multi-pole rotationally symmetrical connectors, such as banana or cinch connectors.
• the tensioning device according to the invention in banana plugs, the aforementioned disadvantages, which have been shown using the banana plug from US Pat. No. 4,384,758, no longer occur.
• the insertion of the plug and also the tensioning of the contact pin can be done comfortably with one hand. If the clamping lever is always locked in the same position - this can be done in a simple manner by using suitable stops. can be set, a uniform, reproducible contact pressure is achieved with each tensioning of the contact pin. Operating errors are almost impossible.
• the clamping element can be designed as a simple tension and pressure-resistant clamping pin. Such a dowel pin is stable and can be produced with little effort.
• the contact element can be designed as an elongated contact pin, it is very advantageously possible to design the contact element as a cylindrical or conical contact sleeve.
• Such an embodiment of the connector is necessary if the corresponding socket is provided with an outer, cylindrical or conical contact surface, such as. B. with RCA connectors.
• the contact segments of the contact sleeve must be spread inwards for tensioning. It is very easy to use the clamping mechanism according to the invention if the contact sleeve is supported by an annular cushion, for example one O-ring - is surrounded. This pillow is supported radially from the outside.
• the tensioning force is introduced via a tensioning element designed as a pressure-resistant sleeve, which presses on an end face of the cushion axially supported on an abutment. When tensioned, the cushion expands radially inward and presses the contact segments of the contact sleeve against the outer surfaces of the socket.
• a further advantageous design of the electrical connector results if the connector is provided with a large number of contact pins and / or contact sleeves, all or some of which are provided with clamping devices.
• the cushion is made of silicone rubber.
• This synthetic material stands out due to very good deformability and high long-term stability. If the conditions of use arise - for example high temperatures or chemically aggressive environmental conditions - the use of other polymers is also conceivable.
• FIG. 1 shows a longitudinal section through a tensionable banana plug with a tensioning device according to the invention in the untensioned state
• Fig. 2 is a cross section along the line A-A 'of Fig. 1;
• FIG. 3 shows a longitudinal section through a clampable banana plug which is inserted and clamped into a socket
• Fig. 4 shows a cross section along the
• FIG. 6 shows a cross section along the line C-C from FIG. 5.
• FIG. 1 the connector shown - a so-called banana plug - is provided as a whole with the reference 1.
• the banana plug 1 essentially consists of a plug body 2, which consists of conductive material and is externally not tendency insulating layer 2a is surrounded.
• An elongated, cylindrical contact pin 3 connects to the connector body 2 at the front.
• the contact pin 3 has four contact segments 4a, 4b, 4c and 4d which run in the longitudinal direction and can be expanded radially outward, of which only 4a and 4b can be seen in FIG. 1.
• An actuating lever 5 of a tensioning device is located in the rear part of the connector.
• the actuating lever 5 is pivotably connected to a tensioning element 7 about a transverse axis 6 and is thus pivotable in a longitudinal plane of the connector.
• the tensioning element 7 is mounted in the longitudinal direction in a bore 8 extending in the longitudinal direction through the plug body.
• the longitudinal bore 8 widens in diameter in the area of the contact pin 3. This creates a circumferential collar 10 in the course of the bore 8.
• the outer boundary of the widened longitudinal bore 8 is formed by the contact segments 4a, 4b, 4c and 4d.
• the clamping element 7 is surrounded by a sleeve-shaped deformable cushion 11, which is axially on the one hand on the knob 9 of the clamping element 7 and on the other hand on the collar 10 of the drilling element. tion 8 is supported.
• the sleeve-shaped cushion 11 has radial play in the annular space between the clamping element 7 and the contact segments 4a, 4b, 4c and 4d.
• the plug body 2 has a blind bore 12, which serves to receive an electrical lead.
• the electrical supply line is clamped by screwing a screw into the threaded bore 13.
• a further blind bore 14 is introduced into the plug body 2 from behind in the longitudinal direction and serves to receive contact pins of further banana plugs. This means that the banana plugs can still be cascaded.
• Fig. 2 the cross section along the line A-A 'of Fig. 1 is shown.
• the clamping element 7 is surrounded by the sleeve-shaped deformable kisses 11 with radial play.
• the sleeve-shaped cushion 11 does not completely fill the annular space between the tensioning element 7 and the contact segments 4a, 4b, 4c and 4d; No radial force initially acts on the inner walls of the contact segments 4a-d through the outer circumference of the cushion 11.
• FIG. 3 shows a banana plug 1 according to the invention in the same view as FIG. 1.
• the reference symbols have largely been adopted.
• a socket 15 with a blind bore 16 the inner surface of which represents the contact surface of the socket 15.
• the contact pin 3 of the banana plug 1 is inserted into the blind bore 16 of the socket 15 and shown tensioned.
• FIG. 4 shows a cross section along the line BB ′ in FIG. 3 through the socket 15 with the contact pin 3 clamped therein in the same view as FIG. 2
• the operating lever 5 is pivoted downward about the transverse axis 6.
• the actuating lever 5 is supported on the connector body 2 from the rear and exerts a rearward force component on the tensioning element 7 via the transverse axis 6.
• the support cam 17 of the actuating lever 5 snaps into a catch 18 in the folded, tensioned position, as a result of which the actuation lever 5 is locked in the tensioned position.
• the actuating lever 5 acts on the transverse axis 6 and thus the clamping element 7 an essentially rearward tensile force.
• the actuating lever 5 is supported in the region 2c on the plug body 2, so that it acts as a two-armed lever and, in turn, when pivoting down, a rearward-directed tensile force component on the transverse axis
• the contact segments 4a-d are pressed flat against the inner wall of the blind bore 16 of the socket 15. On the one hand, this results in a very low contact resistance between the contact pin 3 and the socket 15. In addition, the contact pin 3 is securely mechanically clamped in the blind bore 16 and can no longer be pulled out without loosening the actuating lever 5.
• the operating lever 5 is first - as shown in Fig. 1 - folded up. In this relaxed position, the contact segments 4a-d of the contact pin 3 have a smaller outside diameter than the inside diameter of the blind bore 16 of the socket 15.
• the contact pin 3 of the banana plug 1 is now inserted into the blind hole 16 of the socket 15.
• the actuating lever 5 is then flipped over until the support cam 17 engages in the catch 18.
• the tensioning element 7 is pulled backwards and thereby the contact segments 4a-d of the contact pin 3 spread in the blind bore 16 in the manner described above and clamped in the socket 15.
• FIG. 5 shows a detailed view of the contact elements of a cinch plug with a tensioning device according to the invention in a relaxed state.
• the cinch plug has a conventional, axially arranged, protruding contact pin 19.
• the contact pin 19 is surrounded radially at a distance by a cylindrical contact sleeve formed from the contact segments 20a, 20b, 20c and 20d with an internal contact surface.
• the contact segments 20a-d can be expanded radially inwards. They are surrounded by a housing 21 from the outside at a radial distance. This housing 21 has an inwardly projecting, annular collar 22 at the front end.
• annular Ki ⁇ en 23 is arranged in the annular space between the contact sleeve formed by the contact segments 20a-d and the housing 21, an annular Ki ⁇ en 23 is arranged.
• the annular cushion 23 can, for. B. an O-ring made of soft, deformable polymer material.
• the annular cushion 23 can be pressed against the annular collar 22 of the housing 21 by means of a sleeve 24 which can be displaced in the longitudinal direction and which can be displaced in the longitudinal direction in the annular space between the contact segments 20a-d and the housing 21.
• 6 shows the cross section along the line CC * in FIG. 5. The coaxial arrangement of contact pin 19, the contact segments 20a-d, the annular cushion 23 and the housing 21 can be seen.
• the sleeve 24 is by means of a clamping device not shown in the drawing, the z. B. can be designed similar to the lever mechanism of the banana plug in Fig. 1 and 3, moved forward. With its end face, the sleeve 24 presses the annular cushion 23 axially against the inwardly projecting, annular collar 22 of the housing 21. The axial compression causes the annular cushion 23 to expand radially. Since the expansion is limited radially outwards by the housing wall 21, the actuating force acts radially inwards on the contact segments 20a-d. These are spread radially inwards.

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• Details Of Connecting Devices For Male And Female Coupling (AREA)

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Publications (1)

Family

ID=6494625

Family Applications (1)

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Cited By (1)

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Citations (5)

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• 1993
  • 1993-08-06 DE DE19934326474 patent/DE4326474A1/de not_active Ceased
  • 1993-09-23 TW TW82107819A patent/TW264577B/zh active
• 1994
  • 1994-08-04 WO PCT/EP1994/002586 patent/WO1995005017A1/de active Application Filing

Patent Citations (5)

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