DE2233792A1 - ELECTRIC SWITCH - Google Patents

Description

The invention relates to an electrical
Switch with open ended. Housing, two conductors and means for maintaining one electrical condition between the conductors and for providing another electrical condition, the switch having one open end
of the housing sealing solid insulating plug with a through opening in which one of the
Head is mounted so that it protrudes out of the housing and into the housing, and the plug has a large central part attached to the housing and two identical extensions projecting inward and outward from the central part, of which the inner extension has a fixing point for one

209884/0988

- 2

Spring within the housing and the outer extension means for holding the exposed portion of the one conductor represents at a predetermined distance from the housing.

From US-PS 3,519,972 of the applicant it is already known that for the housing of an electrical switch an insulating face plug can be provided to close the housing and around one of the conductors of the electrical switch, the frontal plug having the same inwardly and outwardly protruding extensions has so that it can be used in the same way and regardless of which extension is after assembly with respect to the housing of the switch located inside or outside. This creates an alignment problem with the automatic Installation of the frontal plug in the switch housing avoided.

The aim of the invention is to provide an improved switch of the type mentioned as well as an improved frontal switch To create plugs for such a switch or the like.

It has been shown that if the axial length of the large central part of the frontal plug for the switch structure described above is reduced, while the axial length of each of the extensions while maintaining the axial overall length of the plug is increased, not only will it be easier to create a recess in the housing of the Manufacture switch for receiving the end plug according to the invention, but that the exposed part of the through the plug according to the invention running conductor through the extension of the plug with greater accuracy in a predetermined distance from the outer housing can be maintained to meet the agreed electrical requirements to meet, which have only been met by the fact that for this reason epoxy resin or an adhesive over the

209884/0988 - ⁵ -

- 5 port set of the plug was attached running out.

The aim of the invention is achieved according to the invention with a switch of the type described in the introduction, that each of the extensions of the plug has an axial length at least as great as the length of the central part of the plug having.

One embodiment of the end-side plug for such a switch can be constructed to ₉ that a positive Pestlegeeinrichtung for an internal spring of the switch results, and that such Pestlegeeinrichtung is formed in the same manner on the inner and outer port sets of the end-side stopper so that the front plug can be assembled with the housing of the switch in any position. The plague means provided on the outer set of ports provides a means of mechanically plaguing the for fixed assembly of the. Switch used sealing adhesive.

In another embodiment, the port sets have of the plug, however, has a smooth frustoconical shape. Embodiments of the invention are shown in the drawing and are described in more detail below. Show it: -

Pig. 1 shows a longitudinal section of an embodiment of the invention,

Pig. 2 shows a cross section of the insulating end face Plug of the invention for the Pig switch. 1,

Pig. 3 is a plan view of the relatively weak springs of the Switch according to Pig. 1,

■ - 4 209884/09 8 8

Fig. 4 is a cross-section of an electrically conductive sliding part of the switch of Fig. 1;

FIG. 5 shows a longitudinal section of a further embodiment of FIG Invention,

6 is a plan view of the disassembled switch according to all embodiments of the invention in approximately natural size,

7 shows a longitudinal section of the switch according to FIG. 1, in which the lower half is a view of the frontal plug according to the invention and the upper half Half shows an end plug according to US-PS 3,519,972,

Fig. 8 is a longitudinal section similar to Fig. 7 with the exception that the lower half is a further embodiment of the frontal plug according to the invention, and

FIG. 9 shows a cross section of the front plug of the switch according to FIG. 8.

In Fig. 1 to 4 of the drawing, an embodiment of a switch 1o according to the invention is shown, which a cylindrical, tubular, electrically and thermally conductive housing 12 with a termination 14 at one and a closure or plug 16 at the other end. The termination or plug 16 is made of electrically non-conductive material Material such as ceramic or the like.

A first conductor 18 is in conductive contact with the housing 1? at its one-piece end 14. A two-

- 5 209884/0988

The conductor 2o rsgt through the electrically non-conductive termination or plug 16 into housing 12. One normally solid, fusible tablet 22 is to be exerted on the closure 14 with spring force. -

An electrically conductive part 24 is slidably disposed in the housing 12. The part 24 is on its circumference in sliding, resilient conductive engagement with the conductive housing 12 via outwardly extending resilient ones integrally molded teeth 26 which press against the inner surface of the housing 12 to the outside. The part has further a conductive middle part 28 which, in one position of the part 24, has an electrically conductive connection to the second electrical conductor 2o and in a further position of the part 24 no electrical connection to the second having electrical conductor 2o.

A compression spring assembly external to the tablet 22 is held under pressure between the part 24 and the housing 12, when the tablet 22 collapses, the state of the electrical connection between the housing 12 and the electrical Change conductor 2o by moving the conductive member 24 to the left out of contact with the conductor 2o. ·

The closure or plug 16 has a central opening 3o> which runs in the longitudinal direction and surrounds the second conductor 2o. The plug 16 is in the conductive housing 12 attached to the right end of the housing in that a cylindrical Large diameter plug main body or central portion 32 engages inner surface 34 * of the conductive housing 12 stands.

The plug 16 has two equal inner and outer port sets 36 and 38 of equal diameter, which are from opposite Sides of the middle part 32 protrude away. The outer one

209884/0988 -6-

Extension 38 protrudes from one end of the conductive housing 12 and the inner extension 36 protrudes into the conductive housing 12 and is engaged in a conductor holding device such as a conductor head 4o on the inside End of the second conductor 2o.

A sealant or adhesive 42 surrounds a portion of the outer extension 38 of the plug as well as one Part of the second conductor 2o adjacent to the outer extension 38 and is against the right end of the housing 12 at one inwardly protruding flange 44 of the housing is sealed, not only to fasten the conductor 2o in the housing 12, but also to at least leave a non-conductive space between the housing 12 and the exposed part of the conductor 2o to give a predetermined size. This inwardly directed flange 44 prevents movement of the Middle part 32 and the outer extension 38 of the stack to the outside.

The identically constructed extensions 36 and 38 of the plug 16 have the same gradually decreasing surface diameter as shown in Figures 1, 2 and 5, and they have transverse flat surfaces 46 and 48 at the ends, of which the surface 46 is in engagement with the conductor head 4o and holds the conductor 2o to a movement of the second Conductor 2o to the outside of the housing 12 and the plug IC to prevent out.

The conductive housing 12 has a recess or one thinner wall part 34 at the right end with inner flanges 44 and 50 of the housing at each end of the thin wall part The thin wall portion 34 holds the main body or center portion 32 of the plug 16 and the inner flanges 44 and 5o of the housing hold the extensions 36 and 38 of the plug and prevent longitudinal movement.

- 7 209884/0988

As shown in FIGS. 1, 2 and 5, the inventive has Plug 16 extensions 36 and 38 which are defined by two at their junction with one annular edge 39 joined together frustoconical Parts 35 and 37. The annular edge 39 defines a locking device on the corresponding plug extensions 36 and 38, the purpose of which will be described below. It can be seen that each locking device in Form of an annular edge 39 in a spring axial cross-section of the plug 16 is curved. :

The compression spring assembly includes a relatively strong spring 52 in the form of a compression spring between the tablet 22 and the electrically conductive part. .24. Sin such a compression spring structure further includes a relatively weak spring 54 in the form of a compression spring between the plug 16 and the electrical conductive part 24-. As long as the tablet 22 does not collapse, the strong spring 52 holds the conductive part 24 printed against the conductor head 4o of the conductor 2o, so that an electrical connection between the second conductor 2o and the housing 12 and thus to the first conductor 18 is made. However, if the tablet 22 collapses, the material will such a tablet 22 is essentially instantaneously liquid, flows around a disc 56 and enables it that the strong spring 52 to the termination 14 towards expands so that its spring force is less than the spring force of the relatively weak spring 54. This enables that the weak spring 54 the conductive 'part 24 of the Head 4o moved away so that the conductive member 24 is in a position out of conductive contact with respect to the second electrical conductor 2o moved and thereby the electrical connection between the conductors 2o and 18 is released is to interrupt a current flow through these conductors.

The disk 56 is a spring-loaded distributor disk

- 8 2 0 9884/0988

be, has a smaller diameter than the adjacent inner surface of the housing 12 and is located adjacent one end of the strong spring 52. The strong spring 52 can have a further resilient distributor disk in the form of a disk 58 at its other end. The disk 58 has a smaller diameter than the adjacent inner surface of the housing 12. In this way the disks distribute 56 and 58 the spring force of the spring 52 against the tablet 22 and against the central part 28 of the sliding part 24. The Washers 56 and 58 can be made of metal with flat sides or be conductive discs and thus distribute the spring force effectively.

The first electrical conductor 18 is integral with the one conductive termination 14 connected as an end wall via flanges 6o and 62. The tablet 22 can be adjacent as shown or near the one-piece conductive end wall or termination 14.

The washer 58 is located adjacent to one of the spring ends of the relatively weak spring 54 but on the left side of the sliding part 24, and distributes the spring force of the weak spring 54 by being the central part 28 of the sliding part to prevent bulging of the central part 28 as shown in FIG.

It can be seen that when the extension 36 of the plug 16 is within the housing 12 as shown in FIG is arranged, the right end 55 of the weak spring 54 rests against the edge 39 of the extension 36 to a positive or effective setting of the right end 55 of the spring 54 to achieve. In contrast, such a Right end 55 of the spring the smooth frustoconical extension of the plug eyelet according to the aforementioned US Pat. No. 3,519 972, and the spring would collectively

- 9 209884/0988

built-in state of switch 1 ο-not over their entire Remain essentially cylindrical in length.

If an epoxy or other adhesive 42 for securing the housing 12 around the extension 38 of the plug and to an exposed portion of the conductor 2o as in FIG Fig. 1 is used, such epoxy resin or such a mass' fills the of the annular edge 39 as a fixing device on the outer extension 38 of the plug defined annular recesses as shown, around such a mass or an adhesive 42 mechanically to be connected to the extension 38 when the mass is off- ' is cured and thereby a larger surface area .and a better barrier effect between the adhesive 42 and the extension 38, as if the extension 38, merely a straight or smooth frustoconical extension as in the aforementioned US Pat. No. 3,519,972.

The securing devices or edges on the extensions 36 and 38 thus fulfill the double function of securing of the right end 55 of the spring 54 and the mechanical retention of the adhesive 42 in place independently of which extension 36 or 38 protrudes into or from the housing 12. This allows still an automatic 'device for installing the' plug 16 in the face of the housing 12 during the Use assembly process of the switch 1o according to the invention.

When operating the embodiment according to FIGS. 1 to 4 are opposite power lines with the conductors and 2o connected, wherein in the normal position of the switch 1o as shown in Fig. 1, an electrically conductive Connection between the conductors 18 and 2o is present. The parts of the switch 1o remain in the conductive state and in

- 1o 209884/0 9 88

the position shown in Fig. 1, as long as the housing at a temperature below) the collapse temperature the tablet 22 remains. However, when the temperature near the tablet 22 reaches the collapse temperature, the tablet 22 collapses and becomes liquid or otherwise moved past the disk 56.

The left end of the strong spring 52 moves enough to keep its spring force below that of the weak one Spring 54 to decrease. This enables the spring 54 to move the movable member 24 to the left of the conductor head 4o and so opens the electrically conductive contact between the conductors 18 and 2o.

Fig. 5 shows another embodiment similarly of the embodiment of FIG. 1. According to FIG. 5, however, a disk 64 adjacent to a conductor head 66 is one second conductor 68 arranged. Otherwise, all parts in Fig. 5 are the same as the corresponding parts in Fig. 1 and require therefore there is no renewed complete description in connection with FIG. 5.

The conductor head 66 in Fig. 5 has a substantially flat part 7o with a rounded edge 72. This enables the flat part 7o to have a relatively large surface area and a good electrical conductivity between the second conductor 68, the washer 64, the sliding part 24 and the housing 12 results. At the same time, the disk 64 gives essentially the same motion-distributing properties as the disk 58 in FIG. 1 for the two springs 52 and 54.

The conductor head 4o in FIG. 1 can be rounded somewhat or almost completely in order to produce a good conductive contact between the conductor 4o and the flat central part 28 of its sliding, conductive part 24 su. The ladder head € 6 in

) - 11 - ■ 209884/0938

Pig. 5 is made of metal with good electrical conductivity and has an extended surface over the flat surface 7o Surface contact with the same-sided, highly conductive disk 64. This results in a very good conductive contact between the ladder head 66 and the sliding ladder part or part 24, which is better than via the corresponding η Parts in fig. 1 is. The small rounded edges 72 of the conductor head 66 are sufficient to create an arch to prevent when the conductor head 66 and the disc 64 are separated. When the flat surfaces of the conductor head 66 and the disk 64 are separated, these flat surfaces therefore have a greater interruption capacity as a result the flat surfaces and the small rounded edges compared to the corresponding parts in FIG. 1.

The embodiment of Fig. 5 therefore has a better one electrical conductivity and also a better interruption capacity for ohmic loads than the embodiment according to FIG. 11.

All other parts in Fig. 5 may be substantially the same in structure and function as the corresponding parts in Fig. 1, and a repeated description of these parts should therefore not be necessary.

As already mentioned, there is one of the advantages of the frontal plug according to the invention over the prior art according to the applicant's US Pat. No. 3,519,972 in that the long central part 32 of the end-face plug according to the invention 16 is reduced in axial length from the axial length of the same part in said US-PS, while the axial length of each of the projections 36 and 38 of the end plug of the invention is increased, though the overall axial length of the plug 16 remains the same not only because of the undercutting of the thin wall part

- 12 20888A / 0988

34 'of the housing 12 for receiving and securing the inventive To facilitate plug 16 in its place, but also to ensure in a more precise manner that the through the end-face plug 16 according to the invention, exposed part of the conductor 2o a predetermined distance of the outer housing 12 at its puddle 44 by electrically insulating material to all agreed to meet electrical requirements for such a gap, which in the electrical switch according to said US-PS have only been met in that the fastening epoxy resin or adhesive is changed for this reason extended a certain amount over the port set of the plug and along the conductor.

In Fig. 7 is an axial cross section in the upper half of the known from said US-PS of the applicant shown, while in the lower half of Pig. 7 shows the structure according to the invention of a switch 1o as in FIG Pig. 1 is shown in order to clearly show the features mentioned. The parts of the well-known switch, which the parts of the switch according to the invention 1o are similar have been designated with the same reference numerals and the letter A appended.

As shown in Fig. 7 it can be seen that the axial length of the central part 32 of the frontal plug 16 according to the invention compared to the axial length of the corresponding Middle part 32A of the previously used frontal plug 16a is reduced, while the axial length each of the port sets 36 and 38 versus the axial length of the corresponding port sets 36A or 38A is enlarged. The overall length of the plug 16 according to the invention remains the same as the overall length of the known plug 16A. In the embodiment of the end face according to the invention Plug can be seen that the axial length of each of the

- 13 209884/0988

Port sets 36 and 38 of the frontal plug 16 according to the Invention to at least substantially the same axial length as its central part 32 has been enlarged.

With a smaller axial length of the central part 32 of the frontal plug 16 than the axial length of the corresponding central part 32A of the frontal plug 16A, the length of the undercut or recess in the housing 12, which leads to the thin wall part 34 ^f for receiving the central part 32 substantially less than that of the corresponding depression at the thin wall portion 34- ¹ A of the known housing 12A. The overall length of the housing 12 is also less than that of the housing 12A. Thus, the shorter indentation on the wall part 34 * is easier and more economical to produce than the larger indentation on the wall part 34 ¹ A, if one takes into account in particular the relatively small structure and the TvQiIe how they are produced for the structure of a switch that in Pig. 6 is shown essentially in its natural size.

Next is from Pig. 7 it can be seen that the distance which the port set 38 of the frontal plug 16 of the splash 44 of the housing 12 to the exposed part of the conductor 2o is greater than the distance which is between the lump 44A of the housing 12A and the exposed one Part of the conductor 2oA on the port set 38A of the end face Plug 16A results, so the greater length through the port set 38 of the end plug 16 according to the invention ensures that the space between the housing 12 and the conductor 2o meets all agreed electrical requirements, especially if an epoxy resin or a Adhesive 42 is used as shown.

While the end plug 16 according to the invention as described above the advantage of pest management

-H-20 9 8 84/0988

3379

-H-

lines in the form of edges 39 on the extensions 36 and 38 for the reasons described above, it is understood that the peculiar feature of a smaller countersink in the housing 12 and the accuracy in spacing of the housing 12 from the exposed part of the conductor 2o, which results from the frontal plug 16 of the invention, if desired without the use of Fixing devices in the form of edges 39 on the extensions 36 and 38 can be achieved.

In FIGS. 8 and 9, there is therefore a further embodiment of the invention shown. In Fig. 8 it can be seen that the upper half of the view is a known one Switch assembly and the frontal plug for this as shown in 'the said US-PS. Des Applicant shown, and that in. The lower half of Fig. 8 shows a further end-face plug 16B according to the invention, wherein Parts similar to parts of the switch described above with the same reference numerals and the letter B added are designated.

As shown in FIGS. 8 and 9 it can be seen that the extensions 36B and 48B of the frontal plug 16B according to the invention each having a smooth frustoconical structure extending from the central portion 32A of the plug project away essentially in the same way as the extensions 36a and 38A of the known end-face plug 16A, however, that the length of the extensions 36B and 38B due to the reduced axial length of the central portion 32B from the reasons described above is greater than the length of the extensions 36A and 38A.

While so the end plug 16B according to the invention does not have the securing devices in the form of Has edges 39 of the plug described above, the

- 15 209884/0988

end-face plug 16B according to the invention opposite the well-known face plug Ί6Α the improved Features relating to the reasons as given with regard to the description in connection with FIG. 7 and as in Pig. 8 shown in full.

- 16 - 209884/0988

Claims (6)

Patent claims 1 _% / Electrical switch with open-ended housing, two conductors and means for maintaining an electrical state between the conductors and for providing a different electrical state between the conductors when a certain event occurs, the switch having a solid insulating plug closing the open end of the housing with a through opening in which one of the conductors is mounted so that it protrudes out of the housing and into the housing, and the plug has a large central part attached to the housing and two identical port sets protruding inward and outward from the central part , of which the inner set of ports provides a place for a peder within the housing and the outer set of ports provides means for maintaining the exposed portion of the one conductor at a predetermined distance from the housing, characterized in that each of the sets of ports (36, 38) of the Plug (16) an ax iale length at least as great as the length of the central part (32) of the plug. 2. Switch according to claim 1, characterized g e k e η η ze ichn-et that each of the port sets of the plug is substantially smooth frustoconical part. 3. Switch according to claim 1, characterized in that each of the port sets of the plug one substantially frustoconical inner part and a smaller outer part which is substantially frustoconical and coaxially stepped downward from the inner part. - 17 - 2Ü988A / 0988 4. Switch according to claim 1, characterized in that that each of the extensions of the plug has a locking device between its ends, the locking device on the inner extension of the plug the definition for one end of the inner spring in the housing and the Fixing device on the outer extension of the plug, a mechanical connection for an adhesive for fastening of the housing at the exposed end of a conductor results. 5. Switch according to claim 4, characterized in that each of the extensions of the plug has a substantially frustoconical inner part and has an outer portion which is substantially frustoconical and is stepped off with respect to the inner part, the fixing device of the corresponding Extension of the plug is formed by the junction between its inner and outer part. 6. Switch according to claim 5, characterized in that the junction of each extension of the plug has a domed configuration in each axial cross-section. 2 0 9884/0988