DE2335879A1 - ELECTRIC SWITCH - Google Patents

Description

Dr.-lng. Wooden houses i2.juii 1973

Dipl. -Met. GoIdb'Gh ls / lu

Dipt.-ing. Slater ο ο ο c ρ 7 ο

Patent Attorneys £ .0 OO Ό I Ό

605 OFFENBACHAM RV. IU
flerrnstrasse 37 Telephone 88 83 84

ARROW-HART, Inc. 1o3 Hawthorne Street

Hartford, Connecticut / USA

"Electrical switch"

The invention relates to an electrical switch, and more particularly a switch mechanism for electrical limit switches provided with a trigger or trigger.

Switches operated by pushers or triggers have been known for many years and available on the market in various designs. One made of metal and A push-button switch of the type of interest is also disclosed in U.S. Patent No. 2,789,170. The advancements in the field of plastic ~ technology brought injection mouldable insulating materials with them and enable further improvements in the structure of the electrical Switches and allow a reduction in the load during manufacture and when assembling the switch components

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The invention is therefore based on the object of an improved To provide the switching mechanism of a switch operated by a trigger or trigger, which makes it possible to to connect the parts to one another by a snap action, without the need for additional tools or special machines this would be necessary.

The structure of the switch should be such that all parts are made of one as an insulating material in an economical manner Serving material manufactured or can be produced by injection molding.

Furthermore, in the case of a switch of the type mentioned, a pin serving to block the trigger is to be fastened to the support part of the trigger by a snap connection , whereby the use of special tools must also be dispensable.

Finally, it is in an actuated by a pusher saddle - ter an improved structure and an improved Zusamnenwir-- ken of ^ Rückers, its supporting part and the contact means during the assembly by means of a snap connection without using special tools are created.

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Further aspects and advantages of the invention emerge the description in connection with the drawing.

Finally, the invention comprises a switch mechanism actuated by a trigger for an electrical limit switch of the type described in U.S. Application 23o,374 filed February 29, 1972. The switching mechanism has a reciprocating switching part with a downwardly protruding projection, which is provided with an end position compression spring cooperates in the housing of the electric switch. The switching part is located between the housing of the electric switch and a cover part mnd is forced to be rectilinear in between to move, because it is acted upon by a spring in the direction of the switch-off position. A handle part is effective connected to the switching part and its cover part to give the switching part a rectilinear movement when the pusher part is depressed.

The invention is explained in more detail below with reference to the drawing. Show:

Fig. 1: a perspective view of the one

Trigger operated, switching mechanism according to the invention, which is in an electrical limit switch is arranged.

Fig. 2: an exploded partial representation of the

switching mechanism operated by a printer;

Fig. 3: a longitudinal section through the switching mechanism with

the handle part pointing upwards (switch position off);

4 shows a longitudinal section with a switch mechanism snfus (switch position on) ^{having a depressed trigger 4 part;}

Fig. 5 is a view of one end of the switch showing the Locking pin in its locking position shows, in which he has the handle part in its depressed position holds.

As can be seen from Fig. 1, the is of a trigger or trigger actuated switching mechanism 1o on one in the casting or Injection molding produced, made of an insulating material housing 12 of the electric switch attached.

The details in the structure of the housing 12 and the position and mode of operation of the fixed therein or movable contact pieces correspond to those shown in U.S. Patent Application No. 23o,374 filed February 29, 1972 and are described.

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As in this US application, the switch housing 12 has an open top, side walls 14 and 16 and a bottom wall with two pairs of fixed contact pieces, which are located inside the housing .12 near the side walls 14 and 16 are located. The contact surfaces of each pair of contact pieces are arranged parallel and at a lateral distance in such a way that that they are moving from. Contact pieces can be bridged. The poles can be spade-shaped or otherwise ^ as described therein and are fixed in vertical slots at the corners of the housing 12 in a conventional manner.

A movable contact piece is carried by each of the two separate, parallel insulating plates attached to the Side arms of a swingable yoke are attached, which has pins that serve as bearings in recesses sit centrally on the upper edges of the side walls 14 and 16 of the housing 12. A snapping engagement is the yoke or bracket by a pressure medium or an end position compression spring 2o conferred according to FIGS. 3 and 4, one end of which on a part extending in the transverse direction of the bracket sits, while the opposite end is against one

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Approach or projection 22 presses on a slidingly arranged fitting 24 made of an insulating material, on which in the will be discussed in more detail below. The spring-loaded bracket with a swinging back and forth End position mechanism for controlling the movable contact pieces is known in principle.

As can be seen from the figures, the end position spring 2o of the conventional one is used to control the contact pieces Switching mechanism from the switch position "off" according to ELg. into the switch position "on" according to FIG. 4 by the back and moving forward movement of the rectilinearly displaceable part. The part 24 is composed of an insulating material Form piece which, as a straight body, has a rod-shaped part 26 at its one end (on the right in FIGS. 3 and 4) and one having a Kartal or one that is U-shaped in cross-section Has part 28 at its other end. The part 24 can be over or along the open, the upper side of the Slide switch housing 12 and is held in its respective position by a cover part and during its movement guided.

309885/0546

The cover part 3o has a cover part 32, which with the housing 12 protrudes beyond its ekien end and at its other end The end has a support part 34 intended for the trigger or trigger, which extends beyond the end of the housing 12. The cover part 32 of the cover part 3o is approximately U-shaped and hollow, so that it has a channel for receiving the slidable Part 24 forms. The channel is on its support part 34 for the handle opposite end 36 closed and has laterally extending flanges 38 and 4o, which lie over the top of the housing 12.

As already mentioned in the above-mentioned application, the cover part 3o can be snapped onto the switch housing 12 by means of the plate-like edge parts 42 and 44, which are attached to the edges of the flanges 38 and 4o protrude downwards and are arranged at a distance from one another that they are longitudinal and parallel to the side walls 14 and 16 of the housing 12 are. Apertures 46 are provided in each edge portion 42 and 44 around one or more of them from the side walls 14 and 16 of the housing 12 to receive outwardly extending retaining projections 48 when the cover part 3o pressed over and onto the upper side of the housing 12

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A shoulder or projection 22 is used to adjust the end position spring 2o of the switching mechanism, which protrudes downward from the lower surface 5o in the region of the channel-shaped part 28 of the displaceable part 24 and cooperates with the upper end of the end position spring 2o. In order to push the displaceable part 24 into the "off" switch position, a helical compression spring 52 lies in the channel-shaped part 28 as a displaceable part 24. One end 54 of the spring 52 engages one end 56 of the channel-shaped part 28 (left end in the 3 and 4), while the other "end 58 of the spring 52 is supported on a wall 6o, which protrudes from an inner surface of the cover part 32 on the cover part 3o having a U-shaped channel. When the channel-shaped part 28 lies in the cover part 32 of the U-shaped cover part 3o having a channel, the channel-shaped part 28 receives the wall 6o and at the same time the wall 6o abuts against the other end 61 of the channel-shaped part, whereby the linear movement of the displaceable part 24 in one direction is limited.

To move tew. Adjusting the movable part 24 A trigger or trigger 62 is used, which is rotatably attached to a support part 34 of the cover part 3o. The pusher

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is roughly U-shaped and has a top wall 64 that is slightly is curved and adapted to the shape of a finger. Furthermore, side walls or spaced apart protrude Edge portions 66 and 68 from the top wall 64 downwards. From the upper wall 64 serving to receive the finger protrudes a pin-shaped part or projection 7o downwards, the is dimensioned and configured to be received in a bearing or seat 72 inserted into the upper end 74 of the Support part 34 is formed for the trigger. The trigger 62 is rotatably mounted on the support member 34 as the Pin or projection 7o is seated in the bearing part 72.

The edge part 66 and 68 of the trigger 62 are provided on their lower edge with recesses 76 and 78, which for receiving aligned tenons are used. These pin receiving recesses 76 and 78 have converging entry slots 8o, which lead to an opening 82 receiving the pin, as can be seen from FIG. They are dimensioned so that they one piece with the rod-shaped part 26 of the displaceable part 24 is able to accommodate pivot pin g produced.

The pivot pin 82 is annular at both ends

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Recesses 84 and 86, with the help of which a snap connection along with the pin receiving recesses 76 and 78 on the trigger. The pivot 82 is also located in recesses 81 and 83, which are in the lower region of the support part 34 for the trigger on the cover part 3o are formed.

The edge parts 66 and 68 of the trigger 62 finally have openings 85 and 87, respectively, for receiving a locking pin to serve. The opening 87 is an arcuate slot with a non-axial part which is aligned with the opening 85.

The support part 34 for the trigger has spaced apart, downwardly extending side walls 88 and 9o with axially aligned openings 92 and 94, respectively, which are used to receive the locking bolt. The opening 92 has radially extending slots 96 so that the edge regions of the opening 92 are deformable in such a way that it is possible to pass through a radial flange 98 of the locking bolt 100, which is acted upon by a spring.

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The locking bolt 100 has the shape of a stepped cylinder with a widening, radially protruding end flange 98.

When assembling the trigger and cover part 3o and when connecting of this part with the displaceable part 24, the trigger 62 is first arranged on the supporting part 34 carrying it, with the bearing pin or projection .70 in the bearing part 72 brought into the correct position and then secured with the aid of the pivot pin 82, which is in its position in the for Holding serving "recesses 76 and 78 snaps into place. The with a flanged end of the spring loaded locking pin I00 is then bent by the Slot 87 guided and through the aligned openings 92 and 94. The locking bolt 100 remains in this position the radially extending flange 98 which extends against the outer surface of the side wall 98 in the region of the opening 92 by a Compression spring 1o2 is pulled, which lies concentrically around the locking pin I00 and between the one larger diameter having cylinder part 1o4 and the side wall 9o arranged is.

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As can be seen in particular from FIGS. 3-5, the switch is brought into the "on" switch position (the movable contact pieces touch the spaced-apart, fixed contact pieces) that a force, for example a finger, is applied to the upper wall 64 of the trigger 62 acts. When this force acting on the upper wall 64 is large enough, the projection or peg-shaped part 7 o causes a rotation in the bearing part 72, which leads to a rotary movement of the trigger or trigger 62, whereby a rectilinear movement of the displaceable part 24 is caused, which is rotatably connected to the trigger 62. Movement of the trigger 62 to the "on" position causes the sliding part 24 to move under the force of the spring 52 , so that the sliding part 24 and projection 22 move to the right, as shown in FIG is. When the projection 22 has been completely shifted to the right, the connection of the projection 22 and end position spring 2o in the switch housing 12 means that the movable contact pieces touch the fixed contact pieces due to a snap action, where ^ reached through the switch position "on" will. The degree to which the trigger 62 can be pressed down is limited by the fact that the front wall 1o6 of the trigger 62, which serves as a stop

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collides with the support part 34, as can be seen from FIG.

When the trigger 62 is in its fully depressed position Position according to FIG. 4 is, the opening 85 is axially aligned in a line with the locking pin 1oo. By Applying a sufficiently large axially directed force on the locking pin 1σο can be the radially protruding Flange 98 move through opening 85 and is against edge portion 66 of the trigger by the restoring force of the compression spring 52 drawn. As a result, the Sp.errbolzen 1oo holds the displaceable part 24 in the position shown in FIG. 4 and prevents the projection 22 from moving back so that the switch remains in the "on" position.

The locking pin 1oo can be briefly on the Release trigger 62 acting, downward force, by which it is moved about * down, so that the spring preload on the locking bolt 1oo can pull it back into the opening 85. After the locking pin has been withdrawn 1oo the trigger 62 can return to its raised position according to FIG. 3 due to the influence of the restoring force the compression spring 52.

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The side walls of the support part advantageously extend 34 a little further and form a flange 1o7 according to FIG Fig. 3 with openings 1o8 for fastening the entire Switching mechanism 1o including the switching housing 12 on a workpiece.

From the illustration in Fig. 2 it finally emerges that at the free end of the rod-shaped part of the displaceable Part is an opening 86 through which the pivot protrudes.

The invention is not restricted to the exemplary embodiment shown in the figures; rather, changes can be made can be made without deviating from the basic inventive concept.

309885/0546

Claims (4)

IS Expectations: 1, -Electric switch with a housing, relative to each other movable contact pieces in the housing, a movable switching part in the form of an insulating material existing fitting, with a cover attached to the housing, which is also used for Maintaining a slidable storage of the switching part between it and the housing is used, as well as with a trigger in the form of a molded piece made of insulating material with parallel edge parts, thereby characterized in that the cover part (3o) has an open, fork-shaped or trough-shaped recess serving as a bearing (73) and the trigger (62) have a bearing projection serving as a rotation axis, which is integral with the trigger is formed and is arranged in the recess (72) that also a snap connection producing Connecting means between the trigger (62) and the switching part are effective when the bearing projection rests on the trigger (62) in the recess (72) serving as a bearing, and finally the connecting means the trigger (62) and the switching part on deift cover part keep. 309885/054 ^ 2. Electrical switch according to claim 1, characterized in that that the connecting means producing a snap connection are aligned recesses in the trigger or Include pushers and that an integral with the switching part formed pivot is shaped such that he gets a tight fit by deforming the recesses of the trigger. 3. Electrical switch according to claim 1 and 2, characterized characterized in that the connecting means producing a snap connection is integral with the switching part manufactured pivot pins and aligned recesses in the edge parts of the trigger include the holding parts for the pivot and contain diverging and narrow parts that lead to the holding parts, the diverging parts facilitating the entry of the pin into the holding parts. 4. Electrical switch according to claims 1-3, characterized in that that a locking pin and a compression spring are arranged on the cover part and are designed so that they hold the trigger in a predetermined position, that the cover part has parallel side walls with aligned openings which serve to receive the locking pin that means are provided to - 3 - 309885/05 4 fi the bolt in the openings with the help of a snap connection to be attached, with a reinforcement being provided at one end of the bolt or tenon and that Means are provided at the edge region of the one opening, which allow deformation of the edge regions and the Allow insertion of the reinforced portion of the bolt through the one opening. 309885/0546