CA2070490A1 - Contact spring strip - Google Patents
Contact spring stripInfo
- Publication number
- CA2070490A1 CA2070490A1 CA002070490A CA2070490A CA2070490A1 CA 2070490 A1 CA2070490 A1 CA 2070490A1 CA 002070490 A CA002070490 A CA 002070490A CA 2070490 A CA2070490 A CA 2070490A CA 2070490 A1 CA2070490 A1 CA 2070490A1
- Authority
- CA
- Canada
- Prior art keywords
- contact spring
- legs
- spring strip
- contact
- bent
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
- H05K9/0016—Gaskets or seals having a spring contact
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Springs (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A contact spring strip composed of individual contact springs joined to one another by separating webs is provided on an "endless" roll. The contact springseach include a bent middle region, on either side of which lies a spring leg angled-off in a same direction. Outer regions of the two legs are entirely or partiallyinwardly bent to engage openings in housing parts of a shielded housing.
A contact spring strip composed of individual contact springs joined to one another by separating webs is provided on an "endless" roll. The contact springseach include a bent middle region, on either side of which lies a spring leg angled-off in a same direction. Outer regions of the two legs are entirely or partiallyinwardly bent to engage openings in housing parts of a shielded housing.
Description
~070~90 SPECIFICATION
TITLE
"CONTACT SPRING STRIP"
BACKGROUND OF THE INVENTION
5 Field of the Invention The present invention is directed ~enerally to a contact spring strip for electromagnetic sealing of housing parts of a shielded housing.
Descriptio~ of the Related Art Contact spring strips for electrically conr,ecting two housing parts of a shielded housing are disclosed, for example, in German Utility Model G 86 26 126. A
shielded housing for enclosing an electrical chassis is shown, including a housing cover fastenable on the housing. Electrical contact between the housing and the eover is provided by the spring strip which is mounted along the edge of the housing. These contact spring strips are forrned in a strip shape and are arched in 15 a lateral direction and have claw^like extensions at their longitudinal edges for engagement with the housing parts.
A disadvantage of the known contact spring strips is that they are manufactured in different, fixed lengths. This requires a considerable production outlay and a large warehouse stock of the different lengths of contact spring strips.
20 A further disadvantage is that the known contact spring strips have a slight arch proceeding in a lateral direction, which is difficult to produce in terms of production engineering .
SUMMARY OF THE INVENTION
It is an object of the present invention to provide low cost and easily 25 manufactured contact spring strips which may be used in arbitrary lengths.
The contact spring strip of the present invention includes a plurality of individual contact springs Gonnected to one another in a longitudinal direction by separating webs. The individual contact springs are each composed of an angled-off, or bent, middle region limited in the lateral directions by two leys which are 30 angled off, or bent, in the same direction. At least one inwardly bent spring hook ~7~90 is provided at the outside edge of the first leg. The outer edge regiorl of the second leg is inwardly bent over its entire length and at least one semi-circular projection is provided at the outside edge of the outer, bent-off edge region.
The contact spring strip of the present invention is easily manufactured since it is provided with at least one bend extending in a longitudinal direction, thereby avoiding the manufacture of a contact spring strip with a gradual arch proceeding in a lateral direction. The contact spring strip is subdivided into a plurality of individual contact springs that are connected to one another in a longitudinal direction by the separating webs, so that the contact spring strip can, thus, be manufactured in an arbitrary length as what are referred to as "yard goods". It is, thus, possible to obtain a contact spring strip of the desired length in a simple way by breaking or cutting the desired length of contact spring off, for example, a supply roll shortly before assembly of the spring on the electrical housing.
As a result of the spring hook at one side of the contact spring and the semi-circular projections at the other side, the contact spring strip of the present invention is particularly suitable for use on housing doors having angled-off door edges.
An expedient development of the present contact spring strip is that inwardly directed pocks are arranged at the outer regions of both legs. These pocks provide a high, defined contact pressure between the contact spring strip and the housing door.
BRIFF DESCRlPTiON OF THE DRAWINGS
The invention shall be set forth in greater detail below with reference to an exemplary embodiment shown in the drawings.
Figure 1 is a plan view of a portion of a contact spring strip in accordance with the teachings of the present inventions; and Figure 2 is a cross section through a contact spring portion of the contact spring strip shown in Figure 1 and through a housing door to which the contact spring is secured.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A contact spring strip 1 is made up of a plurality of contact spring portions 2 which are connected to one another in a longitudinal direction bV separating webs 2Q7~Q
3. It is, thus, possible to manufacture the contact spring strip 1 as an "endless"
web which is subsequently rolled up for storage and transportation. Only just prior to assembly of the spring strip in the housing is the contact spring strip 1 cut to the desired length, which is done simply by cutting the desired length from the roll, such as at the separating webs 3. This eliminates the need to keep on hand different lengths of contact springs and also eliminates the need to manufacture contact springs of different lengths.
Each individual contact spring portion 2 includes a middle region 4 which is bent, or angled-off, along a distinct bend extending in the longitudinal direction of the strip. The contact spring portion 2 also includes a first leg 5 and a second leg 6 on either side of the middle region 4. The legs 5 and 6 are connected to the middle region 4 by further distinct bends, also running in a longitudinal direction.
The longitudinally running bends in effect arc the strip 1 in a lateral direction without requiring a continuous curve in the lateral direction. These longitudinally running bends are easily manufactured. The outside edge of the first leg 5 is provided with inwardly bent strip hooks 7. An outer edge region 8 of the second leg 6 is bent inwardly over its entire length. Semicircular projections 10 are arranged along an outside edge 9 of the outwardly bent edge region 8.
The inwardly bent outer edges 7 and ~ do not extend through the separating webs 3. The separating webs 3 are only of flat, unbent material in the preferredembodiment. This enables the strip 1 to be cut at the separating webs 6 without deforming the strip.
As shown in Figure 2, the spring hooks 7 and the semicircular projections 10 are fashioned so that they extend into and hold the individual contact springs 2between openings Iying opposite one another on a housing door 13. The spring hooks 7 and semicircular projections 10 are held in place in the openings under spring pre-stress resulting from the bending of the spring. The openings are provided in the U-shaped edge region of the housing door 13, in other words, along a bentedge.
Inwardly directed pocks 11 formed in the outer regions of the two legs 5 and 6 exert a defined, high contact pressure between the contact spring 2 and the housing door 13 when the housing door 13 is in the closed condition. A button 12 207~4~0 is applied in the middle region 4 tO provide a defined and high contact pressurebetween the contact spring 2 and a housing part that surrounds the housing door 13. By insuring good electrical contact between the housing parts at re~ular intervals, the pocks 11 and buttons 12 insure good electromagnetic enclosure by the 5 housing.
Thus, there is shown and described a contact spring strip composed of individual contac~ springs, or spring portions, joined end-to-end to one another by separating webs. The desired length of contact spring may thus be cut off of an endless roll of the contact spring strip. The contact springs are bent about a middle 10 region along a longitudinally extending bend and thereby define two legs, one on either side of the rniddle region. The outer regions of the two legs are either entirely or partially inwardly bent to engage a housing. These outer regions, however, do not extend through the separating webs.
Although other modifications and changes may be suggested by those skilled 15 in the art, it is the intention of the inventor to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of his contribution to the art.
TITLE
"CONTACT SPRING STRIP"
BACKGROUND OF THE INVENTION
5 Field of the Invention The present invention is directed ~enerally to a contact spring strip for electromagnetic sealing of housing parts of a shielded housing.
Descriptio~ of the Related Art Contact spring strips for electrically conr,ecting two housing parts of a shielded housing are disclosed, for example, in German Utility Model G 86 26 126. A
shielded housing for enclosing an electrical chassis is shown, including a housing cover fastenable on the housing. Electrical contact between the housing and the eover is provided by the spring strip which is mounted along the edge of the housing. These contact spring strips are forrned in a strip shape and are arched in 15 a lateral direction and have claw^like extensions at their longitudinal edges for engagement with the housing parts.
A disadvantage of the known contact spring strips is that they are manufactured in different, fixed lengths. This requires a considerable production outlay and a large warehouse stock of the different lengths of contact spring strips.
20 A further disadvantage is that the known contact spring strips have a slight arch proceeding in a lateral direction, which is difficult to produce in terms of production engineering .
SUMMARY OF THE INVENTION
It is an object of the present invention to provide low cost and easily 25 manufactured contact spring strips which may be used in arbitrary lengths.
The contact spring strip of the present invention includes a plurality of individual contact springs Gonnected to one another in a longitudinal direction by separating webs. The individual contact springs are each composed of an angled-off, or bent, middle region limited in the lateral directions by two leys which are 30 angled off, or bent, in the same direction. At least one inwardly bent spring hook ~7~90 is provided at the outside edge of the first leg. The outer edge regiorl of the second leg is inwardly bent over its entire length and at least one semi-circular projection is provided at the outside edge of the outer, bent-off edge region.
The contact spring strip of the present invention is easily manufactured since it is provided with at least one bend extending in a longitudinal direction, thereby avoiding the manufacture of a contact spring strip with a gradual arch proceeding in a lateral direction. The contact spring strip is subdivided into a plurality of individual contact springs that are connected to one another in a longitudinal direction by the separating webs, so that the contact spring strip can, thus, be manufactured in an arbitrary length as what are referred to as "yard goods". It is, thus, possible to obtain a contact spring strip of the desired length in a simple way by breaking or cutting the desired length of contact spring off, for example, a supply roll shortly before assembly of the spring on the electrical housing.
As a result of the spring hook at one side of the contact spring and the semi-circular projections at the other side, the contact spring strip of the present invention is particularly suitable for use on housing doors having angled-off door edges.
An expedient development of the present contact spring strip is that inwardly directed pocks are arranged at the outer regions of both legs. These pocks provide a high, defined contact pressure between the contact spring strip and the housing door.
BRIFF DESCRlPTiON OF THE DRAWINGS
The invention shall be set forth in greater detail below with reference to an exemplary embodiment shown in the drawings.
Figure 1 is a plan view of a portion of a contact spring strip in accordance with the teachings of the present inventions; and Figure 2 is a cross section through a contact spring portion of the contact spring strip shown in Figure 1 and through a housing door to which the contact spring is secured.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A contact spring strip 1 is made up of a plurality of contact spring portions 2 which are connected to one another in a longitudinal direction bV separating webs 2Q7~Q
3. It is, thus, possible to manufacture the contact spring strip 1 as an "endless"
web which is subsequently rolled up for storage and transportation. Only just prior to assembly of the spring strip in the housing is the contact spring strip 1 cut to the desired length, which is done simply by cutting the desired length from the roll, such as at the separating webs 3. This eliminates the need to keep on hand different lengths of contact springs and also eliminates the need to manufacture contact springs of different lengths.
Each individual contact spring portion 2 includes a middle region 4 which is bent, or angled-off, along a distinct bend extending in the longitudinal direction of the strip. The contact spring portion 2 also includes a first leg 5 and a second leg 6 on either side of the middle region 4. The legs 5 and 6 are connected to the middle region 4 by further distinct bends, also running in a longitudinal direction.
The longitudinally running bends in effect arc the strip 1 in a lateral direction without requiring a continuous curve in the lateral direction. These longitudinally running bends are easily manufactured. The outside edge of the first leg 5 is provided with inwardly bent strip hooks 7. An outer edge region 8 of the second leg 6 is bent inwardly over its entire length. Semicircular projections 10 are arranged along an outside edge 9 of the outwardly bent edge region 8.
The inwardly bent outer edges 7 and ~ do not extend through the separating webs 3. The separating webs 3 are only of flat, unbent material in the preferredembodiment. This enables the strip 1 to be cut at the separating webs 6 without deforming the strip.
As shown in Figure 2, the spring hooks 7 and the semicircular projections 10 are fashioned so that they extend into and hold the individual contact springs 2between openings Iying opposite one another on a housing door 13. The spring hooks 7 and semicircular projections 10 are held in place in the openings under spring pre-stress resulting from the bending of the spring. The openings are provided in the U-shaped edge region of the housing door 13, in other words, along a bentedge.
Inwardly directed pocks 11 formed in the outer regions of the two legs 5 and 6 exert a defined, high contact pressure between the contact spring 2 and the housing door 13 when the housing door 13 is in the closed condition. A button 12 207~4~0 is applied in the middle region 4 tO provide a defined and high contact pressurebetween the contact spring 2 and a housing part that surrounds the housing door 13. By insuring good electrical contact between the housing parts at re~ular intervals, the pocks 11 and buttons 12 insure good electromagnetic enclosure by the 5 housing.
Thus, there is shown and described a contact spring strip composed of individual contac~ springs, or spring portions, joined end-to-end to one another by separating webs. The desired length of contact spring may thus be cut off of an endless roll of the contact spring strip. The contact springs are bent about a middle 10 region along a longitudinally extending bend and thereby define two legs, one on either side of the rniddle region. The outer regions of the two legs are either entirely or partially inwardly bent to engage a housing. These outer regions, however, do not extend through the separating webs.
Although other modifications and changes may be suggested by those skilled 15 in the art, it is the intention of the inventor to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of his contribution to the art.
Claims (5)
1. A contact spring strip for electromagnetically sealing a housing parts of a shielded housing, the contact spring strip providing electrical contact between two of the housing parts, comprising:
a plurality of individual contact springs connected end-to-end to one another by separating webs, each of said plurality of individual contact springs comprising:
a longitudinally bent middle region having two legs angled-off in a same direction on opposite lateral sides of said middle region;
at least one inwardly bent spring hook at an outside edge of a first of said two legs;
a outer edge region bent inwardly along its entire length on a second one of said two legs; and at least one semicircular projection at an outside edge region of said second one of said two legs.
a plurality of individual contact springs connected end-to-end to one another by separating webs, each of said plurality of individual contact springs comprising:
a longitudinally bent middle region having two legs angled-off in a same direction on opposite lateral sides of said middle region;
at least one inwardly bent spring hook at an outside edge of a first of said two legs;
a outer edge region bent inwardly along its entire length on a second one of said two legs; and at least one semicircular projection at an outside edge region of said second one of said two legs.
2. A contact spring strip as claimed in claim 1, further comprising:
inwardly directed pocks formed on an outer region of at least one of said two legs.
inwardly directed pocks formed on an outer region of at least one of said two legs.
3. A contact spring strip as claimed in claim 2, wherein said inwardly directed pocks are provided on an outer region of both of said two legs.
4. A contact spring strip as claimed in claim 1, further comprising:
an outwardly projecting button formed on said angled middle region of each of said plurality of individual contact springs.
an outwardly projecting button formed on said angled middle region of each of said plurality of individual contact springs.
5. A contact spring strip for providing electrical connections between housing parts of a shielded housing, comprising:
a length of contact spring strip, said length including:
a plurality of contact spring portions each having a longitudinally bent middle region and first and second legs on either side of said middle region, said first and second legs each being bent along a longitudinal bend toward a same direction and having edge-most portions bent inwardly; and a separating web between neighboring ones of said plurality of contact spring portions, said separating webs being flat and unbent.
a length of contact spring strip, said length including:
a plurality of contact spring portions each having a longitudinally bent middle region and first and second legs on either side of said middle region, said first and second legs each being bent along a longitudinal bend toward a same direction and having edge-most portions bent inwardly; and a separating web between neighboring ones of said plurality of contact spring portions, said separating webs being flat and unbent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9106956U DE9106956U1 (en) | 1991-06-06 | 1991-06-06 | |
| DEG9106956.4 | 1991-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2070490A1 true CA2070490A1 (en) | 1992-12-07 |
Family
ID=6868026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002070490A Abandoned CA2070490A1 (en) | 1991-06-06 | 1992-06-04 | Contact spring strip |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0517135B1 (en) |
| AT (1) | ATE122531T1 (en) |
| CA (1) | CA2070490A1 (en) |
| DE (2) | DE9106956U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE503467C2 (en) * | 1994-12-14 | 1996-06-17 | Ericsson Telefon Ab L M | Grounding and shielding device |
| DE19644414C1 (en) * | 1996-10-25 | 1997-08-28 | Schroff Gmbh | Electromagnetically screened printed circuit card assembly package for pluggable modules |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2247005B2 (en) * | 1972-09-25 | 1976-03-18 | Siemens AG, 1000 Berlin und 8000 München | HOUSING FOR ELECTRICAL EQUIPMENT, SHIELDED AGAINST HIGH FREQUENCY ELECTROMAGNETIC EMISSIONS |
| DE3328386A1 (en) * | 1983-08-05 | 1985-05-02 | Siemens AG, 1000 Berlin und 8000 München | HIGH-FREQUENCY DENSITY SHIELDING OF AREA PARTS |
| US4572921A (en) * | 1984-07-30 | 1986-02-25 | Instrument Specialties Co., Inc. | Electromagnetic shielding device |
| GB2184294A (en) * | 1985-12-13 | 1987-06-17 | Instr Specialties Co Inc | An electromagnetic shielding device |
| DE8626126U1 (en) * | 1986-09-30 | 1987-01-15 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De |
-
1991
- 1991-06-06 DE DE9106956U patent/DE9106956U1/de not_active Expired - Lifetime
-
1992
- 1992-06-01 DE DE59202121T patent/DE59202121D1/en not_active Expired - Fee Related
- 1992-06-01 AT AT92109185T patent/ATE122531T1/en not_active IP Right Cessation
- 1992-06-01 EP EP92109185A patent/EP0517135B1/en not_active Expired - Lifetime
- 1992-06-04 CA CA002070490A patent/CA2070490A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ATE122531T1 (en) | 1995-05-15 |
| EP0517135A1 (en) | 1992-12-09 |
| DE9106956U1 (en) | 1991-10-10 |
| DE59202121D1 (en) | 1995-06-14 |
| EP0517135B1 (en) | 1995-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |