EP0623971B1 - Improved method for the connection of heater elements - Google Patents
Improved method for the connection of heater elements Download PDFInfo
- Publication number
- EP0623971B1 EP0623971B1 EP94107233A EP94107233A EP0623971B1 EP 0623971 B1 EP0623971 B1 EP 0623971B1 EP 94107233 A EP94107233 A EP 94107233A EP 94107233 A EP94107233 A EP 94107233A EP 0623971 B1 EP0623971 B1 EP 0623971B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insulating support
- sheet
- apertures
- terminal ends
- tongues
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 25
- 210000002105 tongue Anatomy 0.000 claims description 15
- 239000004020 conductor Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
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
- H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
- H01R9/22—Bases, e.g. strip, block, panel
- H01R9/24—Terminal blocks
- H01R9/2491—Terminal blocks structurally associated with plugs or sockets
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/02—Intermediate parts for distributing energy to two or more circuits in parallel, e.g. splitter
Definitions
- the present invention relates to a method for making connections between electric circuits disposed on an insulating support, including the steps of applying a plurality of terminals to said insulating support, said step of applying said plurality of terminals is carried out by mounting at least one conductive member on said insulating support by inserting projections extending therefrom into apertures formed in said insulating support, and mechanically and electrically connecting terminal ends of said electric circuits to said plurality of terminals.
- connection of this type is generally known, and is employed in practically identical manner by different manufacturers, apart from certain marginal variations mainly due to different physical configurations of the resistor elements and the associated supports.
- This technology is substantially based on a manufacturing cycle which shall be briefly outlined in the following in order to facilitate comparison to the method of the present invention to be described subsequently.
- the first step consists in forming the insulating support with a number of apertures at locations corresponding to the terminal ends of the resistance circuits; the second step consists in connecting the terminal ends of the resistance circuits to conductor elements adjacent the locations of respective apertures; the third step consists in rivetting the conductor elements to the insulating support by means of rivets passing through respective apertures, to thereby establish reliable mechanical and electrical connections of the conductor elements to the associated rivets; and the fourth step consists in connecting the rivets to respective power supply terminals in a per se known manner, for instance by soldering.
- reference document DE-A-30 42 417 discloses a method for the connection of heater elements with terminals.
- the terminals are part of a conductive member which comprises a rivet type projection.
- the rivet type projection is inserted in apertures of the insulating support.
- One end of the rivet type projection is formed like a flange and abuts against the insulating support. The other end projects through the insulating support.
- the diameter of the rivet type projection is about equal to the diameter of the apertures in the insulating support.
- the projecting end of the rivet type projection is bent over in order to clamp the insulating support between the flange and the bent over end of the rivet type projection. Even though the number of assembly steps is reduced, this method is still not satisfactory.
- said conductive member being a sheet member being formed with a plurality of outwards projecting tongues, and that said sheet member being positioned so that said tongues coincide with respective terminal ends of said electric circuits, said tongues being bent 180° upon themselves to form two legs for said terminal ends to be received therebetween, and that said sheet member is divided into several separate sheet elements by the execution of multiple cuts at selected locations and the removal of sheet sections extending between adjacent cuts, and that said projections inserted into said apertures and projecting from said insulating support are bent over the edges of said apertures in a locking fit.
- a method according to the present invention is preferably carried out by employing an electric circuit disposed on an insulating support and connected to a flat power supply terminal according to claim 5.
- the method according to the invention is substantially based on the provision that the connections between power supply conductors and the terminal ends of electric circuits are made by using one-piece conductive sheet members adapted to be automatically mounted in apertures suitably formed in an insulating support and to be similarly connected to the terminal ends of electric circuits; for a better understanding of the invention, it shall be supposed that these electric circuits are resistor circuits, it being understood, however, that the invention is similarly applicable to any kind of electric circuits, and particularly to resistor circuits for air heating purposes.
- an insulating support typically a mica plate, supporting one or several elongate resistor circuits 2 mounted in respective rows of apertures suitably formed therein. At the ends of support 1, each resistor circuit terminates in respective terminal ends 2a projecting from support 1 at the same side thereof.
- a single preferably metallic conductive sheet member 5 of elongate shape is attached to one or each end portion 3 of support 1 provided with suitable apertures 4.
- Each sheet member 5 is pre-shaped to present a plurality of tongues 6 projecting from its plane at right angles thereto to coincide with terminal ends 2a for connection there to, and a number of orthogonally extending projections to be received in apertures 4.
- tongues 6 are formed on conductive sheet member 5 at sufficiently wide spacings.
- tongues 6 are pre-bent at 180° upon themselves to thus form a pair of legs adapted to embrace respective terminal ends 2a.
- the projections extending from conductive sheet member 5 are inserted into apertures 4 of insulating support 1 and bent over the edges thereof so as to securely fix the sheet member on the support.
- Sheet member 5 is additionally provided with flat terminal elements 7 likewise projecting therefrom at right angles and adapted to be used as male contacts in flat plug connectors.
- terminal ends 2a are introduced between the pairs of legs formed by the tongues 6 of sheet member 5 (fig. 4).
- sheet member 5 is divided into several separate sheet elements 6a, 6b, 6c by performing, preferably simultaneously, multiple cuts at selected locations, and removing the sheet sections between adjacent cuts (fig.7).
- the locations of the cuts are selected so that
- sheet member 5 may be cut to provide a centrally located sheet element 6c permitting to selectively connect two separate resistor circuits in series, or to connect the two circuits to the electric power supply by using the flat terminal element 7 provided on sheet element 6c.
- sheet element 6c may be simplified for solely connecting two resistor circuits in series, without the provision of any external connections.
- the described method may thus be accomplished by the operations of a) connecting and/or interconnecting electric circuits at selected locations thereof by means of a single conductive sheet member secured to the insulating support, and b), dividing the conductive sheet member into several separate sheet elements adapted to be selectively connected to one or more of the electric circuits, with the possibility of performing these operations in a fully automatized process without any manual intervention.
Landscapes
- Resistance Heating (AREA)
- Multi-Conductor Connections (AREA)
Description
- The present invention relates to a method for making connections between electric circuits disposed on an insulating support, including the steps of applying a plurality of terminals to said insulating support, said step of applying said plurality of terminals is carried out by mounting at least one conductive member on said insulating support by inserting projections extending therefrom into apertures formed in said insulating support, and mechanically and electrically connecting terminal ends of said electric circuits to said plurality of terminals.
- The technology for making connections of this type is generally known, and is employed in practically identical manner by different manufacturers, apart from certain marginal variations mainly due to different physical configurations of the resistor elements and the associated supports.
- This technology is substantially based on a manufacturing cycle which shall be briefly outlined in the following in order to facilitate comparison to the method of the present invention to be described subsequently.
- In the known manufacturing cycle, the first step consists in forming the insulating support with a number of apertures at locations corresponding to the terminal ends of the resistance circuits; the second step consists in connecting the terminal ends of the resistance circuits to conductor elements adjacent the locations of respective apertures; the third step consists in rivetting the conductor elements to the insulating support by means of rivets passing through respective apertures, to thereby establish reliable mechanical and electrical connections of the conductor elements to the associated rivets; and the fourth step consists in connecting the rivets to respective power supply terminals in a per se known manner, for instance by soldering.
- While this known process is sufficiently simple and safe, it suffers from the inconvenience of being a manual process throughout; in view of the severe competition in the field of large-scale industrial production, this extensive use of manual labour results in an inacceptable cost increase, apart from the unavoidable occurrence of quality variations.
- In order to reduce the number of assembly steps, reference document DE-A-30 42 417 discloses a method for the connection of heater elements with terminals. The terminals are part of a conductive member which comprises a rivet type projection. In a first step, the rivet type projection is inserted in apertures of the insulating support. One end of the rivet type projection is formed like a flange and abuts against the insulating support. The other end projects through the insulating support. The diameter of the rivet type projection is about equal to the diameter of the apertures in the insulating support. In a consecutive step, the projecting end of the rivet type projection is bent over in order to clamp the insulating support between the flange and the bent over end of the rivet type projection. Even though the number of assembly steps is reduced, this method is still not satisfactory.
- It would therefore be desirable, and is in fact the object of the present invention, to provide a method permitting resistance circuits and the like to be connected to respective power supply terminals in a fully automatic manner by the employ of actually available technologies.
- This object is achieved by said conductive member being a sheet member being formed with a plurality of outwards projecting tongues, and that said sheet member being positioned so that said tongues coincide with respective terminal ends of said electric circuits, said tongues being bent 180° upon themselves to form two legs for said terminal ends to be received therebetween, and that said sheet member is divided into several separate sheet elements by the execution of multiple cuts at selected locations and the removal of sheet sections extending between adjacent cuts, and that said projections inserted into said apertures and projecting from said insulating support are bent over the edges of said apertures in a locking fit.
- A method according to the present invention is preferably carried out by employing an electric circuit disposed on an insulating support and connected to a flat power supply terminal according to
claim 5. - The invention will be more fully understood from the following description, given by way of example with reference to the accompanying drawings, wherein:
- fig. 1
- shows a component to be mounted on a support as a first step of the method according to the invention,
- figs. 2 and 3
- show and end view and a top plan view, respectively, of a heater circuit in a state attained in a second step of the method,
- fig. 4
- shows a longitudinally sectioned view of the assembly of fig. 3,
- figs. 5 and 6
- show the assembly of figs. 3 and 4 at the end of a subsequent step of the method, and
- fig. 7
- shows the assembly of fig. 5 in the state attained in a final step of the method.
- The method according to the invention is substantially based on the provision that the connections between power supply conductors and the terminal ends of electric circuits are made by using one-piece conductive sheet members adapted to be automatically mounted in apertures suitably formed in an insulating suport and to be similarly connected to the terminal ends of electric circuits; for a better understanding of the invention, it shall be supposed that these electric circuits are resistor circuits, it being understood, however, that the invention is similarly applicable to any kind of electric circuits, and particularly to resistor circuits for air heating purposes.
- With reference to the drawings, there is shown an
insulating support 1, typically a mica plate, supporting one or severalelongate resistor circuits 2 mounted in respective rows of apertures suitably formed therein. At the ends ofsupport 1, each resistor circuit terminates inrespective terminal ends 2a projecting fromsupport 1 at the same side thereof. - In a first step of the method to be described, a single preferably metallic
conductive sheet member 5 of elongate shape is attached to one or eachend portion 3 ofsupport 1 provided withsuitable apertures 4. Eachsheet member 5 is pre-shaped to present a plurality oftongues 6 projecting from its plane at right angles thereto to coincide withterminal ends 2a for connection there to, and a number of orthogonally extending projections to be received inapertures 4. - For reasons to be explained later,
tongues 6 are formed onconductive sheet member 5 at sufficiently wide spacings. In addition,tongues 6 are pre-bent at 180° upon themselves to thus form a pair of legs adapted to embracerespective terminal ends 2a. - In the course of this first step, the projections extending from
conductive sheet member 5 are inserted intoapertures 4 ofinsulating support 1 and bent over the edges thereof so as to securely fix the sheet member on the support. -
Sheet member 5 is additionally provided withflat terminal elements 7 likewise projecting therefrom at right angles and adapted to be used as male contacts in flat plug connectors. - As the second step of the method,
terminal ends 2a are introduced between the pairs of legs formed by thetongues 6 of sheet member 5 (fig. 4). - In the third step of the method, the two legs formed by each
tongue 6 are clamped together so thatterminal ends 2a are firmly retained therebetween, thus providing at the same time a reliable electric connection (figs. 5 and 6). - In the fourth step,
sheet member 5 is divided into severalseparate sheet elements - The locations of the cuts are selected so that
- a) there is obtained at least one pair of
sheet elements respective tongues 6 andterminal ends 2a, and - b) each of the
sheet elements flat terminal elements 7 thereon so as to permit each resistor circuit to be independently energized. - In another solution shown at the bottom end of fig. 7,
sheet member 5 may be cut to provide a centrally locatedsheet element 6c permitting to selectively connect two separate resistor circuits in series, or to connect the two circuits to the electric power supply by using theflat terminal element 7 provided onsheet element 6c. - If so required,
sheet element 6c may be simplified for solely connecting two resistor circuits in series, without the provision of any external connections. - It is thus obvious that the described method may be employed by one skilled in the art for obtaining the greatest variety of of connections between any number of initially separate electric circuits in series, in parallel, and with electric power supply terminals at any desired location.
- The described method may thus be accomplished by the operations of a) connecting and/or interconnecting electric circuits at selected locations thereof by means of a single conductive sheet member secured to the insulating support, and b), dividing the conductive sheet member into several separate sheet elements adapted to be selectively connected to one or more of the electric circuits, with the possibility of performing these operations in a fully automatized process without any manual intervention.
- As a matter of fact, all of the operations described in connection with the four steps of the process as well as the ancillary operations (preparation of the conductive sheet member, drilling the apertures in the insulating support and so on) can be carried out by fully automatized programmable machinery. The construction of such machinery and of the asssociated tools and actuators as well as the composition of the required operating programmes are familiar to one skilled in the art and need therefore not be explained.
- Those skilled in the art will in particular be capable of optimizing the sequence of the various steps with a view to the timing of their execution, or with a view to regrouping the operations into a reduced number of steps each including several elementary operations.
Claims (5)
- A method for making connections between electric circuits disposed on an insulating support (3) including the steps of applying a plurality of terminals (7) to said insulating support (3), said step of applying said plurality of terminals (7) is carried out by mounting at least one conductive member (5) on said insulating support (1) by inserting projections extending therefrom into apertures (4) formed in said insulating support (3), and mechanically and electrically connecting terminal ends of said electric circuits (2) to said plurality of terminals (7),
characterised in thatsaid conductive member being a sheet member being formed with a plurality of outwards projecting tongues (6),and that said sheet member is positioned so that said tongues (6) coincide with respective terminal ends (2a) of said electric circuits (2), said tongues (6) being bent 180° upon themselves to form two legs for said terminal ends (2a) to be received therebetween,and that said sheet member (5) is divided into several separate sheet elements (6a, 6b, 6c) by the execution of multiple cuts at selected locations and the removal of sheet sections extending between adjacent cuts, andthat said projections inserted into said apertures (4) and projecting from said insulating support are bent over the edges of said apertures in a locking fit. - A method according to claim 1, characterised in that at least one pair of separate sheet elements (6a, 6b) is devised to connect the terminal ends (2a) of at least one of said electric circuits (2), each of said sheet elements being provided with at least one flat terminal element (7).
- A method according to any of the preceding claims, characterised in that at least one separate sheet element (6c) is connected to at least one pair of terminal ends (2a) of respective different electric circuit elements (2), and may be provided with one or several flat terminal elements (7).
- A method according to any of the preceding claims, characterised in that it is executed by a fully automised plant.
- An electric circuit (2) disposed on an insulating support (3) and connected to flat power supply terminals (7), said terminals (7) extending from a conductive member (5) which is mounted on said insulating support (3) by inserting projections extending therefrom into apertures (4) formed in said insulating support (3),
characterised by
said conductive member (5) being a sheet member being formed with a plurality of outwardly projecting tongues (6), and by said sheet member being positioned so that tongues (6) coincide with respective terminal ends (2a) of said electric circuits (2), said tongues (6) being bent 180° upon themselves to form two legs for said terminal ends (2a) to be received therebetween, and that said sheet member (5) being divided into several separate sheet elements (6a, 6b, 6c) after being mounted on said insulating support (3) by the execution of multiple cuts at selected locations and that the sheet sections extending between adjacent cuts are removed and that said projections inserted into said apertures (4) and projecting from said insulating support are bent over the edges of said apertures in a locking fit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT93PN000032A IT1268522B1 (en) | 1993-05-07 | 1993-05-07 | IMPROVED PROCEDURE FOR THE CONNECTION OF HEATING ELEMENTS |
ITPN930032 | 1993-05-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0623971A2 EP0623971A2 (en) | 1994-11-09 |
EP0623971A3 EP0623971A3 (en) | 1995-01-11 |
EP0623971B1 true EP0623971B1 (en) | 1996-09-04 |
Family
ID=11394796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94107233A Expired - Lifetime EP0623971B1 (en) | 1993-05-07 | 1994-05-09 | Improved method for the connection of heater elements |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0623971B1 (en) |
DE (1) | DE69400461T2 (en) |
ES (1) | ES2094587T3 (en) |
IT (1) | IT1268522B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2580269A (en) * | 1949-03-19 | 1951-12-25 | Maria De Reitzes Marienwert | Electrical connector |
US3772638A (en) * | 1972-07-13 | 1973-11-13 | Ark Les Switch Corp | Wire connector |
DE2709413C3 (en) * | 1977-03-04 | 1980-08-07 | Fa. Fritz Eichenauer, 6744 Kandel | Radiator for electrical equipment with a fan |
DE3042417C2 (en) * | 1980-11-11 | 1994-02-24 | Eichenauer Gmbh & Co Kg F | Electrical tap element |
-
1993
- 1993-05-07 IT IT93PN000032A patent/IT1268522B1/en active IP Right Grant
-
1994
- 1994-05-09 EP EP94107233A patent/EP0623971B1/en not_active Expired - Lifetime
- 1994-05-09 DE DE69400461T patent/DE69400461T2/en not_active Expired - Fee Related
- 1994-05-09 ES ES94107233T patent/ES2094587T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69400461T2 (en) | 1997-01-16 |
EP0623971A2 (en) | 1994-11-09 |
ES2094587T3 (en) | 1997-01-16 |
ITPN930032A0 (en) | 1993-05-07 |
IT1268522B1 (en) | 1997-03-04 |
EP0623971A3 (en) | 1995-01-11 |
DE69400461D1 (en) | 1996-10-10 |
ITPN930032A1 (en) | 1994-11-07 |
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