EP0240636A2 - Solenoid seal - Google Patents
Solenoid seal Download PDFInfo
- Publication number
- EP0240636A2 EP0240636A2 EP86306870A EP86306870A EP0240636A2 EP 0240636 A2 EP0240636 A2 EP 0240636A2 EP 86306870 A EP86306870 A EP 86306870A EP 86306870 A EP86306870 A EP 86306870A EP 0240636 A2 EP0240636 A2 EP 0240636A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- solenoid
- plug
- wire
- seal
- terminal assembly
- 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.)
- Withdrawn
Links
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 3
- 238000011065 in-situ storage Methods 0.000 claims abstract 2
- 229920003051 synthetic elastomer Polymers 0.000 claims description 3
- 239000005061 synthetic rubber Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007567 mass-production technique Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
Definitions
- This invention relates to means for sealing solenoids against the passage of air and its principal object is to provide a relatively simple form of seal which can be used with very small mass-produced solenoids and is effective over a wide range of temperatures.
- a plug made of synthetic rubber or other suitably deformable material which is fitted into the end of a solenoid, is deformed, by attachment of a terminal assembly, into sealing engagement with the surrounding parts of the solenoid and is only traversed by the end wire of the winding passing through a hole which is pierced at the time of insertion of the wire.
- seal takes the form of a circular plug or diaphragm 1 having a tapered peripheral wall 2 and a recess 3 at its inner end to receive and locate a hollow projection 4 at the end of the bobbin 5 through which the start wire 6 of the solenoid winding passes.
- the plug 1 which is made of synthetic rubber, is fitted into the end of the solenoid casing 7 and the start wire 6 is passed through the plug in a hollow needle which is used to pierce a hole which, upon withdrawal of the needle, closes tightly on the wire.
- the seal according to the invention is capable of use in small solenoids of about 13 mm diameter in which there is very little space in which to use multiple seals, is capable of withstanding temperature cycling between -40°C and + 100°C, including thermal shocks and makes it unnecessary to employ liquid adhesive type seals which are difficult to apply using mass production techniques.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gasket Seals (AREA)
- Pipe Accessories (AREA)
- Magnetically Actuated Valves (AREA)
- Lift Valve (AREA)
Abstract
An airtight seal for the end of a solenoid, takes the form of a plug (1) of deformable material which fits into the end of the solenoid, and is deformable on attachment of a terminal assembly, (8,10,11,13) into airtight sealing engagement with the surrounding parts (7,5,14) of the solenoid, the plug being pierced in situ for the passage of the end wire (6) of the solenoid.
Description
- This invention relates to means for sealing solenoids against the passage of air and its principal object is to provide a relatively simple form of seal which can be used with very small mass-produced solenoids and is effective over a wide range of temperatures.
- To this end, according to the invention, there is provided a plug made of synthetic rubber or other suitably deformable material which is fitted into the end of a solenoid, is deformed, by attachment of a terminal assembly, into sealing engagement with the surrounding parts of the solenoid and is only traversed by the end wire of the winding passing through a hole which is pierced at the time of insertion of the wire.
- A preferred form of seal is illustrated, by way of example, in the accompanying drawing, in conjunction with alternative types of terminal assembly shown in longitudinal section of Figures 1 and 2. In each case, the seal takes the form of a circular plug or
diaphragm 1 having a tapered peripheral wall 2 and arecess 3 at its inner end to receive and locate ahollow projection 4 at the end of thebobbin 5 through which thestart wire 6 of the solenoid winding passes. Theplug 1 which is made of synthetic rubber, is fitted into the end of the solenoid casing 7 and thestart wire 6 is passed through the plug in a hollow needle which is used to pierce a hole which, upon withdrawal of the needle, closes tightly on the wire. It is thus possible to usewires 6 of different diameters with the same seal since it is unnecessary to provide preformed holes. Attachment of a terminal assembly of the kind shown in Figure 1 in which abrass terminal 8 having a central bore 9 for the passage of thewire 6 is carried by a terminal moulding 10, or of the kind shown in Figure 2 in which thewire 6 is soldered at 11 to abrass terminal tag 12 carried by aterminal moulding 13, serves to deform theplug 1 into tight sealing engagement with the mating portions of the casing 7,bobbin 5 and armature 14 to effectively prevent the passage of air under pressure or vacuum through the solenoid. - The seal according to the invention is capable of use in small solenoids of about 13 mm diameter in which there is very little space in which to use multiple seals, is capable of withstanding temperature cycling between -40°C and + 100°C, including thermal shocks and makes it unnecessary to employ liquid adhesive type seals which are difficult to apply using mass production techniques.
Claims (8)
1. An airtight seal for the end of a solenoid, characterised in that the seal comprises a plug (1) of deformable material for fitting into the end of the solenoid, said plug being deformable, on attachment of a terminal assembly (8-10,11-13) into air tight sealing engagement with the surrounding parts (7,5,14) of the solenoid and capable of being pierced in situ for the passage of the end wire (6) of the solenoid.
2. A seal according to claim 1, wherein the plug (1) is made of synthetic rubber.
3. A seal according to claim 1 or 2, wherein the plug (1) is circular.
4. A seal according to any one of claims 1 to 3, wherein the plug (1) has a tapered peripheral wall (2).
5. A seal according to any preceding claim wherein the plug (1) is provided with a recess (3) at one end to receive and locate a hollow projection (4) provided on the solenoid bobbin (5) for the passage of the start wire (6)
6. A solenoid provided with an airtight end seal in accordance with any preceding claim in the form of a plug interposed between one end of the solenoid and its terminal assembly (8-10,11-13), deformed by said terminal assembly into air-tight sealing contact with the casing (7), bobbin (5) and armature (14) of the solenoid and only traversed by the start wire (6) of the solenoid winding passing through a hole which is pierced at the time of insertion of and closes around the wire (6)
7. A method of sealing one end of a solenoid comprising inserting a deformable plug (1) into the end of the solenoid casing (7), piercing a longitudinal hole in the plug and passing the start wire (6) of the solenoid therethrough and inserting the inner end of a terminal assembly (8-10,11-13) under pressure into the casing, whereby the plug is deformed into air-tight sealing engagement with the adjacent parts (7,5,14) of the solenoid and the wire (6).
8. A method according to claim 7, wherein the hole in the plug (1) is pierced by a hollow needle which carries the start wire.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868608297A GB8608297D0 (en) | 1986-04-04 | 1986-04-04 | Solenoid seal |
| GB8608297 | 1986-04-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0240636A2 true EP0240636A2 (en) | 1987-10-14 |
| EP0240636A3 EP0240636A3 (en) | 1988-12-14 |
Family
ID=10595711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86306870A Withdrawn EP0240636A3 (en) | 1986-04-04 | 1986-09-05 | Solenoid seal |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0240636A3 (en) |
| GB (1) | GB8608297D0 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3041254A1 (en) * | 1980-11-03 | 1982-06-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Line transformer for TV receiver - has shielded HV connection as integral part of casing |
-
1986
- 1986-04-04 GB GB868608297A patent/GB8608297D0/en active Pending
- 1986-09-05 EP EP86306870A patent/EP0240636A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB8608297D0 (en) | 1986-05-08 |
| EP0240636A3 (en) | 1988-12-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE DE FR GB IT |
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| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE DE FR GB IT |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19890615 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HOWITT, HENRY GAZELEY |