NZ299112A

NZ299112A - Terminal block with insulation displacement contacts and shield plates in transverse walls between chambers

Info

Publication number: NZ299112A
Application number: NZ299112A
Authority: NZ
Inventors: Petra Beutler; Dieter Gerke; Ferenc Nad; Sabine Zimmer; Frank Mobner
Original assignee: Krone Ag
Priority date: 1995-09-29
Filing date: 1996-08-01
Publication date: 1998-09-24
Also published as: ATE197858T1; UY24314A1; BR9603906A; CO4520300A1; DE19614788A1; EP0766352A3; EG21205A; KR970018859A; DK0766352T3; CA2182460A1; ES2152458T3; EP0766352B1; PL316250A1; AU701705B2; DE59606164D1; EP0766352A2; AR003204A1; DE19614788B4; UA28046C2; RU2174275C2

Description

<div class="application article clearfix" id="description"> New Zealand No. 299112 International No. PCT/ TO BE ENTERED AFTER ACCEPTANCE AND PUBLICATION Priority dates: 29.09.1995; Complete Specification Filed: 01.08.1996 Classification:^) H01R9/03.24; H01R13/648 Publication date: 24 September 1998 Journal No.: 1432 NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION Title of Invention: Terminal block for high transmission rates Name, address and nationality of applicant(s) as in international application form: KRONE AKTIENGESELLSCHAFT, a German company of 14167 Berlin-Zehlendorf, Germany 2991 12 NEW ZEALAND PATENTS ACT, 1953 No: Date: COMPLETE SPECIFICATION N.2. PATENT OFFICE 1 - AUG 1996 RECEIVED TERMINAL BLOCK FOR HIGH TRANSMISSION RATES We, KRONE AKTIENGESELLSCHAFT, a German company, of 14167 Berlin-Zehlendorf, Germany, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - 1 - (followed by page - la -) - la - 2991 The present invention relates to a terminal block for high transmission rates in the telecommunication and data technique, comprising a plastic body with chambers disposed in at least one row for insulation displacement contact elements and slots for shield plates disposed in the transverse walls between said chambers and extending with parallel axes thereto. A terminal block of the type referred to hereinbefore is known in the art from US Patent 5,160,273. Herein it is intended to solve the problem of crosstalk through the cable wires connected to adjacent insulation displacement contact elements by insertion of a multitude of electrically conductive shield plates between the individual pairs of insulation displacement contact elements. The problem of crosstalk occurs at the transmission of large information volumes by electrical lines, the information being transmitted at high frequencies. The transmission at such high frequencies causes radiation and interference between adjacent cable wires, in particular when these cable wires are disposed closely adjacent to each other in the terminal block. By insertion of the electrically conductive shield plates a higher crosstalk attenuation at high frequencies is achieved. The prior art terminal block comprises two parallel rows of chambers for insulation displacement contact elements, one shield plate each being assigned thereto and the opposite shield plates of the two rows being connected by a large-area connection plate being 2991 1 inserted into the respective lower part of the terminal block. Application of large-area, electrically-conductive shield plates requires however an increase of the constructional volume of the terminal blocks and higher costs for the manufacture of the terminal blocks. It is therefore the object of the invention to provide a terminal block, wherein by the configuration of specially shaped shield plates an effective reduction of crosstalk and a substantial simplification of assembly of the shield plates and of the cable wires at the insulation displacement contact elements is guaranteed. The solution of this object is achieved, according to the invention, by that the chambers of a terminal unit are disposed in the plastic body at the lowest possible distance to each other, and that the slots for receiving the shield plates are provided from the lower side in the thicker transverse wall between two adjacent terminal units each. Thereby it is possible, by means of only two shield plates, to shield a pair of chambers forming a terminal unit and disposed at a small distance to each other in the plastic body. The larger distance between the chambers of adjacent terminal units reduces the risk of crosstalk. In a preferred embodiment, the shield plates have in the upper section a latch opening cooperating with a latch lug in the plastic body when inserting the shield plate into the terminal block. The shield plates are inserted from the lower side into the terminal block. Further, the shield plates have in the area of the contact pin a cutout providing for a favourable cable guiding. The transmission properties are improved by a magnetic field structure favourably influenced by this measure. The shield plates are con- 2991 1 nected to each other k)? the contact pins and a circuit track, for example on a printed circuit board. The configuration of the cable wire introduction section of the insulation displacement contact element as provided in a preferred embodiment according to the invention permits an easier termination of cable wires by that the cable wires brought in place by hand are reliably attached by a tool prior to pressing-in by the knubs in the introduction section. According to another embodiment, the shield plates of at least one chamber can be connected by narrow webs inserted in grooves in the bottom of the plastic body. This configuration of the shield plates allows a technically and economically less expensive installation of the shield plates immediately in the upper part of the terminal block, so that the configuration of the shield plates according to the invention is also possible for wire connectors comprising one row only of chambers for insulation displacement contact elements and having no lower part.. Further, three shield plates of two adjacent pairs of chambers can be connected to each other by narrow webs to form a shield plate cage. The three shield plates and the narrow webs connecting them form in the plane of the webs the shape of an eight consisting of seven short sheet-metal strips. In a particularly preferred manner are disposed one slot each in the transverse wall between two pairs of closely adjacent chambers and two slots each in the transverse wall between two pairs each of closely adjacent chambers for receiving the shield plates. Hereby a particularly compact construction of in particular a wire connector is made possible. By the pair-wise configuration of the chambers at a small distance to each other in a row of the plastic body, crosstalk attenuation of the insulation dis- 2991 placement contact elements inserted in these chambers is further improved, the more since the distance of each pair of closely adjacent chambers of a terminal unit to the adjacent pair of another terminal unit is larger than the distance of closely adjacent chambers. Hereby the capacities of adjacent pairs of insulation displacement contact elements arranged in a row are further decreased, and the crosstalk properties are even further improved. In the following, the invention will be described in more detail, with reference to embodiments of a telecommunication and data technique represented in the drawings. There are: Fig. 1 a perspective top view of the lower side of the terminal block comprising shield plates inserted in different stages, Fig. 2 a side view of the terminal block of Fig. 1 with inserted shield plates, Fig. 3 a top view of the lower side of the terminal block of Fig. 2, Fig. 4 a sectional representation of the terminal block of Fig. 2 at the position of an inserted shield plate, Fig. 5 the side view of a shield plate, Fig. 6 the side view of an insulation displacement contact element, Fig. 7 a partially sectional side view of a terminal block, Fig. 8 a partially sectional front view of the terminal block of Fig. 7, Fig. 9 a bottom view of the terminal block of Figs. 7, 8 with shield plate cages, block for high transmission rates in the - 5 - 2991 1 Fig. 10 a bottom view of a shield plate cage, Fig. 11 a side view of the shield plate cage of Fig. 10, and Fig. 12 a front view of the shield plate cage of Fig. 10. According to the representation in Fig. 1, the terminal block is formed of a plastic body 1 comprising four terminal units 26 with two chambers 2 each disposed at a distance d. The chambers 2 are formed from the upper side 5 of the terminal block and serve for receiving insulation displacement contact elements 28. Each pair of chambers 2 of a terminal unit 26 is limited by a transverse wall 27, wherein a slot 25 is provided from the lower side 23 for the insertion of a shield plate 24 with a contact pin 32. The distance d between the chambers 2 of terminal unit 26 is substantially smaller than the distance D between the chambers 2 of adjacent terminal units 26. The distance D is at least 1.5 times the distance d. Each terminal unit 26 consists of a pair of chambers 2 comprising the insulation displacement contact elements 28 and a shield plate 24. The shield plate 24 shown on the left-hand side of Fig. 1 is only then necessary, when another terminal block is added. The terminal block can also be formed of plastic body assemblies separate for each terminal unit 26, said assemblies being combined to an arbitrary number of terminal units 26. The plastic bodies 1 can be lined up with the front sides 37 either smoothly or by latch elements. In Fig. 2 is shown, in the side view of the terminal block, the position of the insulation displacement contact elements 28 in the plastic body 1 and the configuration of the individual terminal units 26 and the distances d between the chambers 2 of a terminal 2991 unit 26 and to the adjacent terminal units 26. The insulation displacement contact elements 28 are accessible from the upper side 5 of the terminal block. According to the representation of Fig. 6, the insulation displacement contact elements 28 have an introduction section 29 for not shown cable wires, said section being formed of opposite knubs 30 limiting a circular expanded portion 31 towards top. Thereby a cable wire inserted by hand into the expanded portion 31 is pre-fixed and can be pressed in without proh • >'.as by a suitable tool into the clamping slot 6. Fig. 3 shows, in a bottom view of the terminal block, the position of the contact pins 33 of the insulation displacement contact elements 28 and of the contact pins 32 of the shield plates 24 relative to each other and to the lower side 23 of the terminal block. From Fig. 5 can be seen the configuration of the shield plates 24. The shield plates 24 have a latch opening 34 cooperating with respective latch lugs 3 5 in the upper section of the plastic body 1 (Fig. 4) . In the area of the contact pin 32 is provided a cutout 3 6 in order to guarantee optimum wire guiding. The position of the shield plates 24 in the plastic body 1 is shown in Fig. 4. It becomes apparent that the rest surface of the shield plate 24 is reduced. The contact pin 32 is formed offset relative to the longitudinal axis of the shield plate 24, so that there is sufficient space for the cutout 36. In another embodiment according to Pigs. 7 to 12, each chamber 2 comprises, as is shown in Fig. 7, a clamping slot 6 with lateral clamping webs 7 for clamping down the insulation of a cable wire, the conductor of which is pressed into the insulation displacement contact element 3 and is contacted in sol - 7 - 2991 1 derless, screwless and stripless manner with the insulation displacement contact element 3. On the lower side 23 of the plastic body 1 are formed fixing pins 8 made of plastic, said pins serving for attachment of the wire connector, for example on printed circuit boards. As is shown in Figs. 7 and 9, the distance d between two immediately adjacent clamping slots 6 serving for the insertion of a pair of insulation displacement contact elements 6 is appreciably smaller than the distance D between the clamping slot 6 of the chamber 2 of the one pair and the clamping slot 6 of the chamber 2 of the adjacent pair. In the transverse wall 9 formed between two pairs of closely adjacent chambers 2 is provided from the lower side 21 a slot 11, and in the wider transverse wall 10 disposed between two groups of closely adjacent pairs are provided from the lower side 23 two slots 11 being connected on the lower side 23 in the bottom 12 of the wire connector by grooves 13, 14, 15, as it is shown in the bottom view in Fig. 9. Into the slots 11 and grooves 12 to 14 of two adjacent pairs of chambers 2 or two adjacent groups of chambers 2, resp., is inserted a shield plate cage 15 as shown in Figs. 10 to 12. Said cage comprises three shield plates 16 inserted from the lower side 23 into the slots 11 between the pairs of adjacent chambers 2 in the plastic body 1, and further narrow webs 17, 18, 19 snap-fitted in the bottom grooves 12 to 14 of the plastic body 1, when the shield plates 16 are fully slid into the respective slots 11. The three shield plates 16 and the narrow webs 17 to 19 connecting them have in the plane of the webs 17 to 19 the shape of an eight ormed of seven short sheet-metal strips, as is shown in Fig. 10. The respectively outside shield plates 16 in the diagonally - 8 - 2991 1 opposite corners 20 are each slightly bent off, as is shown in Fig. 10. In order that the two shield plate cages 15 of the plastic body 1 of a wire connector shown in Figs. 7 to 9 fit, a slot 11 is formed in the transverse wall 9 between the two pairs of closely adjacent chambers 2, and two parallel slots 11 each are formed in the transverse wall 10 between two groups of pairs each of chambers 2 disposed closely side-by-side for receiving the shield plates 16 of the respective shield plate cage 15. Each of the two shield plate cages 15 has in the central area of the plastic body 1 of the wire connector wherein two parallel slots 11 for two shield plates 16 are provided in the transverse wall 10, one earthing tapping portion 21 each on the lower side of the shield plates 16, as is shown in Figs. 7, 11 and 12. These are connected to a not shown earthing position of a not shown printed circuit board. The individual insulation displacement contact elements 3 have contact pins 22 projecting from the lower side for connection to the respective circuit tracks of the printed circuit board. </div>

Claims

<div class="application article clearfix printTableText" id="claims"> 90 0 - 9 - WHAT WE CLAIM IS;

1. A telecommunications and data transfer terminal block for high transmission rates, comprising: a plastic body with chambers disposed substantially in a row, slots defined in transverse walls between said chambers and extending with parallel axes thereto and grooves in a bottom of said plastic body; insulation displacement contact elements, each element being disposed in one of said chambers; shield plates, each of said shield plates being disposed in one of said slots; a web inserted in one of said grooves, said web connecting one of said shield plates adjacent to one of said chambers to another of said shield plates adjacent to another of said chambers.

2. A terminal block according to claim 1, wherein said shield plates have a height dimension and said web has a height dimension, said web height dimension being smaller than said shield plates height dimension.

3. A terminal block according to claim 2, wherein said shield plates height dimension is more than twice said web height dimension.

4. A terminal block according to claim 2, wherein said shield plates height dimension is more than three times said web height dimension.

5. A terminal block according to claim 2, wherein said shield plates height dimension is more than four times said web height dimension.

6. A terminal block according to claim 2. whprpi n INTELLECTUAL PROPERTY .OFFICE said shield plates height dimension is mo said web height dimension. re than Qp 11 me s 1 1 AUo 1998 RECEIVED r - 10 -

7. A terminal block according to claim 2, wherein each web is disposed extending substantially parallel to the direction of extent of the shield plates.

8. A terminal block according to claim 1, wherein said chambers are arranged pairwise at a distance (d) to each other, separated by one of a plurality of transverse walls formed in said plastic body, and said slots each being partially formed in one of said transverse walls between two adjacent pairs each of chambers arranged side-by- said.

9. A terminal block according to claim 1 wherein three of said shield plates of two adjacent pairs of chambers are connected to each other by said web and by an additional web to form a shield plate cage.

10. A terminal block according to claim 9, wherein said three shield plates and web and said another web form in a plane a shape of an "eight" consisting of seven short sheetmetal strips.

11. A terminal block according to claim 10, wherein one of said slots is disposed in a transverse wall between two pairs of closely adjacent chambers, and two of said slots each are disposed in a transverse wall between two pairs each of closely adjacent ones of said chambers for receiving shield plates.

12. A telecommunications and data transfer terminal block for high transmission rates, comprising: substantially in a low, slots defined in transverse walls between said chambers and extending with parallel axes thereto and grooves in a bottom of said plastic body; a plastic body with chambers disposed insulation displacement contact < element being disposed in one of said chamb shield plates, each of said shield plates being disposed in one of said slots; a web, extending substantially parallel to a direction of extent of said shield plates, inserted in one of said grooves, said web connecting one of said shield pistes adjacent to one of said chambers to another of said shield plates adjacent to another of said chambers.

13. A terminal block substantially as hereinbefore described with reference to Figures 7 to 12 the accompanying drawings. Uoc\t AltoiqesdlsdiqA By theauthorised agents A.tKRARK&SON Perl I flU INTELLECTUAL PBOPffllY OFFICE 0FN2. 17 AUG 1998 RECEIVED </div>