US2684412A - Cam-controlled switch - Google Patents
Cam-controlled switch Download PDFInfo
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- US2684412A US2684412A US271988A US27198851A US2684412A US 2684412 A US2684412 A US 2684412A US 271988 A US271988 A US 271988A US 27198851 A US27198851 A US 27198851A US 2684412 A US2684412 A US 2684412A
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- United States
- Prior art keywords
- switch
- spindle
- cam
- contact bridge
- switching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
- H01H19/60—Angularly-movable actuating part carrying no contacts
- H01H19/62—Contacts actuated by radial cams
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
- H01H19/60—Angularly-movable actuating part carrying no contacts
- H01H19/62—Contacts actuated by radial cams
- H01H19/626—Contacts actuated by radial cams actuating bridging contacts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
Definitions
- the present invention relates to an electric switch, which has a cam-operated contact bridge the spacing of which relative to the switch axis is changed upon performance of the switching movement, switch having arranged between the control cam and the contact bridge a roller following the control cam. It is an object of the invention to improve said switch so that its space requirement is reduced in relation to the power to be controlled and a reliable double break is ensured even after prolonged use, in spite of simplicity in structure and manufacture, desired combination being possible by aligning several of such switches to perform any switching program.
- cam switches that may be combined are known. Usually the individual switch contacts are operated by the switching cams through the intermediary of rollers and levers, which are thereby swung about their pivots. These switches, however, interrupt the circuit only at one point.
- This object is to be achieved with small space requirements and simple structural elements.
- an electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with said contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component eirective in said direction of switching is transmitted, if insignificant sliding resistance forces are neglected.
- the forces which are directed transversely to the direction of switching and for the perfect absorption of which long plunger guides were required previously, are derived exclusively to the switch body by a special bearing arrangement of the roller.
- This arrangement also permiis of a simpler mounting of the stationary contacts whereby, as a whole, the structure of the present switch is greatly simplified without affecting its eiiectiveness or service life.
- Fig. l is a top plan View on the switch body, showing the switch mechanism, the casing cover being removed, and
- Fig. 2 a cross-sectional view of a switch combination consisting of two such switches and a stepping unit.
- Fig. 1 some of the movable parts and a stationary contact carrying connecting part have been omitted whereas Fig. 2 shows the switch part min a section taken along line IlIa:lIa, and the switch part b in a section along line IIbIIb of Fig. 1.
- Part 0 of Fig. 2 is the stepping unit common to both switches and not iorrning part of the invention.
- Fig. 3 serves to explain the kinematic phenomena in the guide device for the switch roller
- Figs. 4: to 6 show the construction of a stationary contact part
- Figs. 7 and 8 show the construction of the contact bridge.
- the insulating switch body I is suitably formed from synthetic resin. It has four apertures, through which the clamping studs :2 are stuck, which as shown in Fig. 2 hold together the entire combination switch consisting in the present eX- ample of the switch units a, o and the stepping unit 0.
- the square switch shaft 3 carries the switching cams 5, each of which cooperates with pressure rollers 5only the upper one is shownof the switch plunger.
- the switching cam i is indicated with dashed lines.
- Each switch plunger consists of a pressed syntheticresin part i into which a roller-guiding metal fork 8 is pressed, in which the spindle 9 carrying the roller 5 is mounted. As shown on Fig.
- this part "i is guided between a smooth part of the inside wall it of the switch body member I, on the one hand, and a similar part of the outside wall i2, which may form part of the adjacent switch body member or, as in the example shown, of a cover member
- the contact bridge it rests with a large surface area on the outer end face of the part i.
- the contact bridge has an aperture embracing an extension I? or" the part 1.
- a compression spring !8 bearing against the rim part is of the switch body member I, acts directly on the contact bridge l5.
- the spindle s of the roller laterally protrudes beyond the prongs or the fork 8.
- These protruding parts find safe guidance on the one hand in a slot at recessed into the switch body member I and forming a guiding groove, and on the other hand i a guide piece 2! resting in a recess 22 in the casing cover 3'5 (Fig. 2).
- a guide piece 2! resting in a recess 22 in the casing cover 3'5 (Fig. 2).
- the outside of the switch body member is given corresponding recesses 22, into which the guide pieces of any adjacent switch unit are inserted.
- the embodiment shown illustrates a double switch having two mutually opposite contact bridges l5, that a switch for the simultaneous interruption of two conductors.
- the invention is not restricted to this type of switch; it is possible to interrupt at the same time three or more circuits, the contact bridges being suitably providcd in a star arrangement. By a corresponding shape of the switching earn it is possible to cause one circuit to be closed when the other is opened, etc.
- Fig. 2 it is apparent from Fig. 2 that by arranging any desired number of switch bodies in am'al alignment, and operating them by a single shaft 5, any desired switching program may be performed.
- the necessary stepping mechanism is provided in the form or" a separate stepping device 0 (Fig. 2).
- the spindle 9 has in the fork 3 some lateral play, which relative to the play of said spindle in the guide slot as or slot plate 2
- roller 5 the opposite sense as the roller 5. It is apparent that sliding friction is exercised to any substantial extent only between the roller 5 and its spindle ii; the thus produced lateral shear effeet is small, however, and be removed almost entirely if antifriction bearings are used
- the roller 5 being of much larger diameter than the spindle 9, both parts may be made integral, without thereby substantially deteriorating the conditions described because the fact that parts 5 and 9 are integral does not substantially affect the described resolution of forces.
- the contact bridge is lifted accurately from the fixed contacts provided on contact pieces or connecting pieces 25. This lifting taking place evenly and without sliding movements between the contacts, the latter have a silver layer without any risk that the contact may be worn off soon.
- the parts 26 are inserted with their ends into recesses 36 of the switch body.
- the parts 25, as shown in Figs. 4 and 5, which represent the contactcarrying stationary connecting part in a front view (Fig. 4) and an appertaining side elevation (Fig. 5), have extensions 3
- the extensions of the part 26 (Figs. 4, 5) fit corresponding recesses provided at the outside of the adjacent switch body member I (Fig. 2b) or of a cover part 3'! (Fig. 2a).
- This connecting part is formed by bending from a flat copper strip shown in Fig. 6.
- the threaded holes receiving the terminal screws are designated with 34, the rivet hole to receive the contact head 25 is designated with 35.
- the thus completed connecting parts are stuck without any fixing screws simply between the recesses provided on the switch body or cover part 3'! and are clamped by the clamping screws 2 forcing the said parts together.
- Figs. 7 and 8 show a contact bridge in elevation and in a section taken along line VII--Vl1 of Fig. 8, respectively, the contact heads being omitted.
- An offset central portion 36 forms a spring plate for the compression spring [8, the force of which determines the contact pressure.
- the described bearing and guiding arrangement for the switch plunger permits of numerous variations, of course, e. g., the guide piece 2
- the forces transmitted by the cam to the roller are resolved into a transverse component, which is taken up only by the switch body or switch casing, and a component moving the contact bridge. Since the forces laterally stressing the contact bridge are now eliminated, short guide means for the same suifice so that the overall height is reduced. Because there are no longer any appreciable shear forces acting on the stationary contacts, either, the latter may simply be stuck into the switch body, whereby the cost of manufacturing the switch is out.
- the cam control described 6 may also be used as a stepping mechanism in the part c, Fig. 2. In this case the contact bridge is eliminated. As compared with the prior art this arrangement leads to the replacement of the previously used tension springswhich tend to suffer eye breakage-by compression springs, and also saves space.
- An electric switch comprising at least two switch body members, fixedly arranged contact parts carried by at least one of said switch body members, said switch body members including a switch cover, a rotary cam mounted in each switch body member, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, and being adapted to cooperate with said fixedly arranged contact parts, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members, one end or said spindle being mounted in the space between one set of said projections provided on said switch cover, another end of said spindle being mounted in the space between one set of said projections provided on another one of said switch body members, said projections being adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit only in said direction of switching so that of
- An electric switch comprising at least two switch body members, fixedly arranged contact parts carried by said switch body members, said switch body members including a switch cover, a rotary cam mounted in each switch body member, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, and being adapted to cooperate with said fixedly arranged contact parts, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members, one end of said spindle being mounted in the space between one set of said projections provided on said switch cover, another end of said spindle being mounted in the space between one set of said projections provided on another one of said switch body members, said projections being adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit onl in said direction of switching so that of a force
- An electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, said contact bridge unit having a forklike extension, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle having a diameter smaller than said roller, said roller being freely rotatably mounted on said spindle, and mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle extending through said forklike extension with a lateral play larger than its lateral play in said projections, said spindle engaging with the contact bridge unit only in said direction of switch ing so that of a force exercised on the contact bridge unit only a co: pcnent effective in said direction of switch is transmitted.
- An electric switch comprising at least one switch body member, a rotary earn, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter small r than the roller, mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit only in said direction of witching so that of a force exercised on the contact bridge unit only a component effective in said direction of switching is transmitted, and connecting members carrying contacts adapted to cooperate with said contact bridge unit, each connecting member having projections fixed to said switch body members only by the interlocking of projections of each connecting member with recesses in said switch body members.
- an electric switch comprising at least one switch body member: the provision of means for transmitting motion only in a direction of switching from a rotary cam to a contact bridge unit movable in said direction of switching to vary its spacing from the axis of rotation oi the cam, said means comprising a roller interposed between the cam and the contact bridge unit and adapted to roll on the earn, a spindle for mounting said roller, said spindle having a diameter smaller than said roller, a forklike extension of said contact bridge unit, and mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle extending through said forklike extension with a lateral play larger than its lateral play in said projections, said spindle engaging with the contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component eiTective in said direction of switching is transmitted.
- an electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, and a spindle for mounting said roller, said spindle having a diameter smaller than the roller: the provision of means to transmit to the contact bridge unit, of a force exercised on said spindle, only a component effective in said direction of switching, said means comprising a forklike extension of said contact bridge unit and mutually parallel extensions provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transversely to said direction, said iorklike extension embracing said spindle with a lateral play larger than the lateral play with which said projections embrace said spindle to prevent said spindle from engaging with said contact bridge unit other than in said direction of switching.
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Description
y 1954 F. BAUER CAM-CONTROLLED SWITCH Filed Dec. 19, 1951 INVENTOR. FRA NZ BA UEE BY 2 j n 77MB! A TTORNE Patented July 20, 1954 CAM-CONTROLLED SWITCH Franz Bauer, Vienna, Austria, assignor to E lubert Naimer, Vienna, Austria Application December 1. 3, 1951, Serial No. 271,988
Claims priority, application Austria January 2, 1951 '7 Claims. 1
The present invention relates to an electric switch, which has a cam-operated contact bridge the spacing of which relative to the switch axis is changed upon performance of the switching movement, switch having arranged between the control cam and the contact bridge a roller following the control cam. It is an object of the invention to improve said switch so that its space requirement is reduced in relation to the power to be controlled and a reliable double break is ensured even after prolonged use, in spite of simplicity in structure and manufacture, desired combination being possible by aligning several of such switches to perform any switching program.
The most varying types of cam switches that may be combined are known. Usually the individual switch contacts are operated by the switching cams through the intermediary of rollers and levers, which are thereby swung about their pivots. These switches, however, interrupt the circuit only at one point.
The attempt to use instead of the switching lever a double-breaking contact bridge, which offers also the advantage or eliminating in the circuit any flexible conductor involving various dimculties in the case of high currents, has had only unsatisfactory results so far. Above all it has not yet been possible to derive in a simple manner from the rotary movement of the cam the lifting movement of the contact bridge in such a manner that even in continuous operation the contact bridge is moved only in the direction of switching. As a rule this movement is to be effected at right angles to the contact surfaces because then the abrasive wear of the contacts, which occurs upon sliding movements transverse to the direction of switching and is dangerous particularly for silver contact surfaces, is eliminated. Whereas it is possible to avoid sliding contact movements and to achieve a simultaneous double break if the parts guiding the contact bridge are manufactured accurately, in the known switches larger forces transverse to the direction of switching are efiective in the contact bridge so that sliding movements take place already when the components have been worn to a small degree only.
It is known to guide in a slot of the switch body the roller rolling on the control cam, by means of an extension of the roller spindle, which stands out from the contact bridge. The roller being mounted in the bridge in a direction normal thereto, the shear forces occurring during the operation of the switch and effective trans- Versely to the switching movement are trans- 2 mitted to the contact bridge so that the disadvantages just mentioned become apparent to an increasing extent as the play between the guide parts increases.
It is also known to guide the contact bridge directly at the switch body and to arrange the roller connecting the control cam and the contact bridge in the switch body in a recess extending in the direction of the switching movement. Since it is not possible to make the guide surfaces of the contact bridge long enough Without inadmissibly enlarging the switch, this case also involves a wear of the guide surfaces by the lateral shear force occurring between the roller, which rotates upon switching, and the contact bridge, so that an inaccurate, sliding contact movement results.
Thus a permanently reliable guidance of the contact bridge, being a requisite condition for a simultaneous break of the contacts, involves excessively large switch bodies or, as is apparent from the switch structure shown in the U. S. Patent No. 2,3083%, leads to switches in which the spacing of the contact bridge from the switch axis is not altered during the switching movement. That type of switch is not sufficiently adapted for use in combinations and, moreover, is too large relative to the power controllable thereby.
It is an object of the invention to provide a cam-controlled switch, in which the forces between cam, roller, and bridge are taken up in such a manner that a reliable double break is ensured even after a practically unlimited number of switch operations. This object is to be achieved with small space requirements and simple structural elements.
To this end it is a feature of the invention to provide an electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with said contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component eirective in said direction of switching is transmitted, if insignificant sliding resistance forces are neglected. Thus, in accordance with the invention, the forces which are directed transversely to the direction of switching and for the perfect absorption of which long plunger guides were required previously, are derived exclusively to the switch body by a special bearing arrangement of the roller. This arrangement also permiis of a simpler mounting of the stationary contacts whereby, as a whole, the structure of the present switch is greatly simplified without affecting its eiiectiveness or service life.
Further features of the invention will be explained hereinafter with reference to the accompanying diagrammatic drawings, in whi h:
Fig. l is a top plan View on the switch body, showing the switch mechanism, the casing cover being removed, and
Fig. 2 a cross-sectional view of a switch combination consisting of two such switches and a stepping unit.
In Fig. 1 some of the movable parts and a stationary contact carrying connecting part have been omitted whereas Fig. 2 shows the switch part min a section taken along line IlIa:lIa, and the switch part b in a section along line IIbIIb of Fig. 1. Part 0 of Fig. 2 is the stepping unit common to both switches and not iorrning part of the invention.
Fig. 3 serves to explain the kinematic phenomena in the guide device for the switch roller,
Figs. 4: to 6 show the construction of a stationary contact part, and
Figs. 7 and 8 show the construction of the contact bridge.
The insulating switch body I is suitably formed from synthetic resin. It has four apertures, through which the clamping studs :2 are stuck, which as shown in Fig. 2 hold together the entire combination switch consisting in the present eX- ample of the switch units a, o and the stepping unit 0. The square switch shaft 3 carries the switching cams 5, each of which cooperates with pressure rollers 5only the upper one is shownof the switch plunger. In Fig. 1 the switching cam i is indicated with dashed lines. Each switch plunger consists of a pressed syntheticresin part i into which a roller-guiding metal fork 8 is pressed, in which the spindle 9 carrying the roller 5 is mounted. As shown on Fig. 2, this part "i is guided between a smooth part of the inside wall it of the switch body member I, on the one hand, and a similar part of the outside wall i2, which may form part of the adjacent switch body member or, as in the example shown, of a cover member The contact bridge it rests with a large surface area on the outer end face of the part i. For its safe fixation on the part l the contact bridge has an aperture embracing an extension I? or" the part 1. A compression spring !8 bearing against the rim part is of the switch body member I, acts directly on the contact bridge l5.
As may be seen from the upper part of Fig. 2a, the spindle s of the roller laterally protrudes beyond the prongs or the fork 8. These protruding parts find safe guidance on the one hand in a slot at recessed into the switch body member I and forming a guiding groove, and on the other hand i a guide piece 2! resting in a recess 22 in the casing cover 3'5 (Fig. 2). For the assembly of a combination switch the outside of the switch body member is given corresponding recesses 22, into which the guide pieces of any adjacent switch unit are inserted.
The embodiment shown illustrates a double switch having two mutually opposite contact bridges l5, that a switch for the simultaneous interruption of two conductors. The invention is not restricted to this type of switch; it is possible to interrupt at the same time three or more circuits, the contact bridges being suitably providcd in a star arrangement. By a corresponding shape of the switching earn it is possible to cause one circuit to be closed when the other is opened, etc. Moreover, it is apparent from Fig. 2 that by arranging any desired number of switch bodies in am'al alignment, and operating them by a single shaft 5, any desired switching program may be performed. To ensure that any switch combination may be assembled from prefabricated parts, the necessary stepping mechanism is provided in the form or" a separate stepping device 0 (Fig. 2).
By a turning of the switch shaft 3 the can wheel l is turned whereby the switch plungers by means of the roller 5, its spindle 8 and forks 8, are lifted, or, if they had been lifted, are lowered by the rollers 5 falling under the action of the spring is into the recesses on the camwheel. The kinematic phenomena occurring during these operations will now be explained with reference to Fig. 3, in which like reference numbers as in Figs. 1, 2 are used for like parts.
The spindle 9 has in the fork 3 some lateral play, which relative to the play of said spindle in the guide slot as or slot plate 2| is so chosen that upon a turning of the cam i and the resulting lateral displacement of the roller 5 the spindle 9 will contact the respective side faces of said guide grooves (indicated at 2i) in Fig. 2 and registering in projection with the corresponding side faces of the slide pieces 2!) but does not contact the side faces 3 of the prongs oi the fork. When it is assumed that the cam be turned in the direction of the arrow A, the roller 5, when lifted by the cam surfaces i, will be displaced somewhat to the right, whereby the spindle e of the roller contacts the right-hand surfaces 26 of the guide groove 26 or of the slide piece 2i (compare also Fig. 1). Gwing to the special manner in which the spindle 9 cooperates with the fork 8, essentially thereby that the spindle has in the fork more lateral play than the guide grooves 26, 2 2, whereas on the other hand the surface 8 of the fork rests on the spindle 9, the requirement is fulfilled that the spindle 9 is operatively connected with the contact bridge l5 practically only in the direction of switching B (Fig. 3) by way of the parts I and 3. Thus of any forces exercised by the spindle 9 on the forks 8 only the components extending in the direction of switching are transmitted, whereas the components extending transversely to the direction of switching are absorbed by the guide means 2e, 2!. Thus the guide means provided in the switch body for the plungers I remain practically free from lateral stresses and, therefore, are hardly worn, whereas in the known types such wear soon results because in switches of such type surface lubrication to remedy such wear is not applicable, as a rule. Since theseguide means in the present case are subjected to small stresses only, they may be short or may under certain circumstances be eliminated entirely.
During the lifting of the roller 5 by the camthe former turns in the sense of the arrow 0, whereas the spindle 9 rolls on 242' and S", turning in the sense of the arrow D, that is, in
,for the spindle 9.
the opposite sense as the roller 5. It is apparent that sliding friction is exercised to any substantial extent only between the roller 5 and its spindle ii; the thus produced lateral shear effeet is small, however, and be removed almost entirely if antifriction bearings are used The roller 5 being of much larger diameter than the spindle 9, both parts may be made integral, without thereby substantially deteriorating the conditions described because the fact that parts 5 and 9 are integral does not substantially affect the described resolution of forces.
As a result of being operated in this special manner, the contact bridge is lifted accurately from the fixed contacts provided on contact pieces or connecting pieces 25. This lifting taking place evenly and without sliding movements between the contacts, the latter have a silver layer without any risk that the contact may be worn off soon.
Since by the described operation of the contact bridge the contact is made without a lateral stressing of the connecting parts 26 carrying the stationary contacts, the same need not be fixed to the switch body by screws.
In the embodiment shown the parts 26 are inserted with their ends into recesses 36 of the switch body. Moreover, the parts 25, as shown in Figs. 4 and 5, which represent the contactcarrying stationary connecting part in a front view (Fig. 4) and an appertaining side elevation (Fig. 5), have extensions 3| which also fit into corresponding recesses 32 of the switch body (shown at bottom right in Fig. 1, where the connecting part has been omitted). The extensions of the part 26 (Figs. 4, 5) fit corresponding recesses provided at the outside of the adjacent switch body member I (Fig. 2b) or of a cover part 3'! (Fig. 2a). This connecting part is formed by bending from a flat copper strip shown in Fig. 6. The threaded holes receiving the terminal screws (see Fig. 1, top left) are designated with 34, the rivet hole to receive the contact head 25 is designated with 35. The thus completed connecting parts are stuck without any fixing screws simply between the recesses provided on the switch body or cover part 3'! and are clamped by the clamping screws 2 forcing the said parts together.
Figs. 7 and 8 show a contact bridge in elevation and in a section taken along line VII--Vl1 of Fig. 8, respectively, the contact heads being omitted. An offset central portion 36 forms a spring plate for the compression spring [8, the force of which determines the contact pressure.
The described bearing and guiding arrangement for the switch plunger permits of numerous variations, of course, e. g., the guide piece 2| ma be eliminated entirely or may be provided at both ends of the spindle 9.
It may be said that by the construction according to the invention the forces transmitted by the cam to the roller are resolved into a transverse component, which is taken up only by the switch body or switch casing, and a component moving the contact bridge. Since the forces laterally stressing the contact bridge are now eliminated, short guide means for the same suifice so that the overall height is reduced. Because there are no longer any appreciable shear forces acting on the stationary contacts, either, the latter may simply be stuck into the switch body, whereby the cost of manufacturing the switch is out. It may be mentioned that the cam control described 6 may also be used as a stepping mechanism in the part c, Fig. 2. In this case the contact bridge is eliminated. As compared with the prior art this arrangement leads to the replacement of the previously used tension springswhich tend to suffer eye breakage-by compression springs, and also saves space.
I claim:
1. An electric switch comprising at least two switch body members, fixedly arranged contact parts carried by at least one of said switch body members, said switch body members including a switch cover, a rotary cam mounted in each switch body member, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, and being adapted to cooperate with said fixedly arranged contact parts, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members, one end or said spindle being mounted in the space between one set of said projections provided on said switch cover, another end of said spindle being mounted in the space between one set of said projections provided on another one of said switch body members, said projections being adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component effective in said direction of Witching is transmitted.
2. A switch as set forth in claim 1, in which at least part of said projections are formed on an intermediate piece connected with the respective switch body member.
3. An electric switch comprising at least two switch body members, fixedly arranged contact parts carried by said switch body members, said switch body members including a switch cover, a rotary cam mounted in each switch body member, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, and being adapted to cooperate with said fixedly arranged contact parts, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members, one end of said spindle being mounted in the space between one set of said projections provided on said switch cover, another end of said spindle being mounted in the space between one set of said projections provided on another one of said switch body members, said projections being adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit onl in said direction of switching so that of a force exercised on the contact bridge unit only a component effective in said direction of switching, at least part of said projections being formed on a guide piece fixedly mounted in a recess of one of said switch body members.
4. An electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, said contact bridge unit having a forklike extension, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle having a diameter smaller than said roller, said roller being freely rotatably mounted on said spindle, and mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle extending through said forklike extension with a lateral play larger than its lateral play in said projections, said spindle engaging with the contact bridge unit only in said direction of switch ing so that of a force exercised on the contact bridge unit only a co: pcnent effective in said direction of switch is transmitted.
5. An electric switch comprising at least one switch body member, a rotary earn, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter small r than the roller, mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit only in said direction of witching so that of a force exercised on the contact bridge unit only a component effective in said direction of switching is transmitted, and connecting members carrying contacts adapted to cooperate with said contact bridge unit, each connecting member having projections fixed to said switch body members only by the interlocking of projections of each connecting member with recesses in said switch body members.
6. In an electric switch comprising at least one switch body member: the provision of means for transmitting motion only in a direction of switching from a rotary cam to a contact bridge unit movable in said direction of switching to vary its spacing from the axis of rotation oi the cam, said means comprising a roller interposed between the cam and the contact bridge unit and adapted to roll on the earn, a spindle for mounting said roller, said spindle having a diameter smaller than said roller, a forklike extension of said contact bridge unit, and mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle extending through said forklike extension with a lateral play larger than its lateral play in said projections, said spindle engaging with the contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component eiTective in said direction of switching is transmitted.
'7. In an electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, and a spindle for mounting said roller, said spindle having a diameter smaller than the roller: the provision of means to transmit to the contact bridge unit, of a force exercised on said spindle, only a component effective in said direction of switching, said means comprising a forklike extension of said contact bridge unit and mutually parallel extensions provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transversely to said direction, said iorklike extension embracing said spindle with a lateral play larger than the lateral play with which said projections embrace said spindle to prevent said spindle from engaging with said contact bridge unit other than in said direction of switching.
References Gited in the file of this patent UNITED STATES PATENTS Number Name Date 1,826,509 Douglas Oct. 31, 1931 2,308,406 Van Valkenburg Jan. 12, 1943 2,511,821 Bullard June 13, 1950 2,588,632 Jefirey Mar. 11, 1952 FOREIGN PATENTS Number Country Date 49,444 Netherlands Oct. 15, 1940 228,328 Switzerland Nov. 15, 1943 633,808 Great Britain Dec. 30, 1949
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT301180X | 1951-01-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2684412A true US2684412A (en) | 1954-07-20 |
Family
ID=3671136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US271988A Expired - Lifetime US2684412A (en) | 1951-01-02 | 1951-12-19 | Cam-controlled switch |
Country Status (7)
Country | Link |
---|---|
US (1) | US2684412A (en) |
BE (1) | BE508130A (en) |
CH (1) | CH301180A (en) |
DE (1) | DE1006486B (en) |
FR (1) | FR1054290A (en) |
GB (1) | GB710788A (en) |
NL (1) | NL77290C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1159075B (en) * | 1956-04-23 | 1963-12-12 | Hubert Naimer | Electrical switchgear with a pronounced axis |
US3928740A (en) * | 1973-02-23 | 1975-12-23 | Naimer H L | Rotary switch |
US20060081380A1 (en) * | 2003-12-15 | 2006-04-20 | Hoffman Corey E | Collar locator for slick pump |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1123012B (en) * | 1958-02-25 | 1962-02-01 | Elektroschaltgeraete Grimma Ve | Combination cam switch |
DE1084811B (en) * | 1958-10-01 | 1960-07-07 | Continental Elektro Ind Ag | Cam switches |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL49444C (en) * | ||||
US1826509A (en) * | 1929-06-14 | 1931-10-06 | Harry A Douglas | Electric switch |
US2308406A (en) * | 1940-03-15 | 1943-01-12 | Square D Co | Electric switch |
CH228328A (en) * | 1942-09-23 | 1943-08-15 | Bbc Brown Boveri & Cie | Device for periodic closing and opening of electrical circuits. |
GB633808A (en) * | 1947-12-15 | 1949-12-30 | Craig & Derricott Ltd | Improvements relating to rotary electric switches |
US2511821A (en) * | 1950-06-13 | Control mechanism | ||
US2588632A (en) * | 1947-04-19 | 1952-03-11 | Max L Jeffrey | Switch |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH230341A (en) * | 1942-12-12 | 1943-12-31 | Spaelti Fridolin | Electrical switch with several switching chambers. |
US2521519A (en) * | 1944-12-04 | 1950-09-05 | Cutler Hammer Inc | Circuit controller |
-
0
- NL NL77290D patent/NL77290C/xx active
- BE BE508130D patent/BE508130A/xx unknown
-
1951
- 1951-12-14 CH CH301180D patent/CH301180A/en unknown
- 1951-12-19 US US271988A patent/US2684412A/en not_active Expired - Lifetime
- 1951-12-28 FR FR1054290D patent/FR1054290A/en not_active Expired
-
1952
- 1952-01-02 DE DEN4928A patent/DE1006486B/en active Pending
- 1952-01-02 GB GB195/52A patent/GB710788A/en not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL49444C (en) * | ||||
US2511821A (en) * | 1950-06-13 | Control mechanism | ||
US1826509A (en) * | 1929-06-14 | 1931-10-06 | Harry A Douglas | Electric switch |
US2308406A (en) * | 1940-03-15 | 1943-01-12 | Square D Co | Electric switch |
CH228328A (en) * | 1942-09-23 | 1943-08-15 | Bbc Brown Boveri & Cie | Device for periodic closing and opening of electrical circuits. |
US2588632A (en) * | 1947-04-19 | 1952-03-11 | Max L Jeffrey | Switch |
GB633808A (en) * | 1947-12-15 | 1949-12-30 | Craig & Derricott Ltd | Improvements relating to rotary electric switches |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1159075B (en) * | 1956-04-23 | 1963-12-12 | Hubert Naimer | Electrical switchgear with a pronounced axis |
US3928740A (en) * | 1973-02-23 | 1975-12-23 | Naimer H L | Rotary switch |
US20060081380A1 (en) * | 2003-12-15 | 2006-04-20 | Hoffman Corey E | Collar locator for slick pump |
Also Published As
Publication number | Publication date |
---|---|
DE1006486B (en) | 1957-04-18 |
CH301180A (en) | 1954-08-31 |
FR1054290A (en) | 1954-02-09 |
NL77290C (en) | |
BE508130A (en) | |
GB710788A (en) | 1954-06-16 |
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