CA1114486A - Thermic timing mechanism - Google Patents
Thermic timing mechanismInfo
- Publication number
- CA1114486A CA1114486A CA306,794A CA306794A CA1114486A CA 1114486 A CA1114486 A CA 1114486A CA 306794 A CA306794 A CA 306794A CA 1114486 A CA1114486 A CA 1114486A
- Authority
- CA
- Canada
- Prior art keywords
- switch
- mechanism according
- members
- thermal expansion
- bimetallic
- 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.)
- Expired
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 230000004913 activation Effects 0.000 claims abstract description 15
- 238000010411 cooking Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000001994 activation Methods 0.000 abstract description 10
- 238000010009 beating Methods 0.000 abstract 1
- 230000010349 pulsation Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 241001481828 Glyptocephalus cynoglossus Species 0.000 description 1
- 101100400378 Mus musculus Marveld2 gene Proteins 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
Abstract
A B S T R A C T
An electric time switch mechanism is provided comprising a plurality of units each having an operating thermal expansion member, for example, a bimetallic member. Electrical beating means are provided for the thermal expansion member and a switch is activated by the thermal expansion member. The units are connected in series in such a way that the activation of a switch turns off the heating means of the associated thermal expansion member and turns on that of the following units.
The switches remain in the activated state after activa-tion and are resettable by external activation.
An electric time switch mechanism is provided comprising a plurality of units each having an operating thermal expansion member, for example, a bimetallic member. Electrical beating means are provided for the thermal expansion member and a switch is activated by the thermal expansion member. The units are connected in series in such a way that the activation of a switch turns off the heating means of the associated thermal expansion member and turns on that of the following units.
The switches remain in the activated state after activa-tion and are resettable by external activation.
Description
4~il6 TITLE
Electric time swich mcchanism FIELD OF THE INVENTION
The invention relates to an elec-tric time switch -mechanism which operates with an electrically heated thermal expansion member9 for example a bimetallic member.
BACKGROUND OF THE INVENTION
Time switch mechanis~shave been proposed in which a heated bimetallic member activates a mechanical ratchet which, after heating the bimetallic member, releases a component under spring tension which advances one step.
Thus, several heatlng cycles and cooling cycles of the bimetallic member may be connected in succession, to pro-long the switching time in relation to the mere single heating of the blmetallic member. However,~ with- these time switch mechanisms, the switching time can only be adjusted in~steps and the mechanism is also relatively ; expensive and, like all mechanisms, is liable to break down and is-exposed to wear.
SUMMARY OF THE INVENTION
An object of the invention is therefore to provide ~ . .
a time switch ~echanlsmiwhich is simple and compact with an improved switching behaviour.
Aocording to the ~nvention there is provided an elec-25~ tric time switch mechanl~m comprising a plurall-ty of units .,: . . ~ : .
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.
: ~ . - :. . . - . . , . . , .... : , .
' ' .... - : ' : .'.,.,. . . ' ' .': , . .
:. : : . .. . . ,. . : . ,:
;.,:' ', . ,'' .: ' ; - ,, .-, ~: ' ' ' "' : ' each having an operating thermal expansion memher, electrical heating means for the thermal expansion member and a switch which is activated by the thermal expansion member, the units being connected in series in such a way that the activation of a switch turns off the thermal expansion member heating means of the associated thermal expansion member and turns on that of the next following unit, the switches remaining in the activated state after activation and being resettable by external activation.
A cascade of thermal expansion members, for example bimetallic members, is thus provided each of which has a switch as the single mechanical member. An adjusting device can preferably be provided for stepless adjustability, by means o~ which adjusting device the position of at least one, and preferably all, of the bimetallic members can be adjusted in relation to the associated switch. The time switch mechanism can thus be adjusted steplessly to a period ranging from the shortest period up to the maximum period.
~O The maximum period can be long since the heating means of the bimetallic members may be designed so as to be affected by mass to have considerable thermal capacity or so as to be thermally inert. They also make the maxi- -mum p riod available, unlike those in which the same bi-metallic member is repeatedly heated, since the latter , - 3 -.. .. . . ..
- . . .. - . , , - - , .: .
: .
: :- -. , , . :, , :
- : , . -,~, . - .
.. : - ' ~ :,: ., . ~ - . : " ' , are not completely cooled during the following cyc:Les.
Although bimetallic members are referred -to primarily herein, the thermal expansion elements could -take some other ~orm, ~or example they could be expansion rods, tubes or the like, although bimetallic members are par-ticularly preferred owing -to their large bending capa-citites.
BRIEF DESCRIPTION OF TEIE DR~WINGS
Fig. 1 is a schematic circui-t diagram of a -time switch mechanism according to the invention with three units;
Fig. 2 is a plan view of an embodiment with two units; and Fig. 3 is a section along line III--III in Eig. 20 DESCRIPTION OF_PREFERRED EM~ODIM~NTS
Fig. 1 shows a time switch mechanism 11 comprising three units 12, 13 and 14 each of which has an operating bimetallic member 15, an associated electric heating means 16 and a switch 17. Each operating bimetallic member is provided with a compensation bimetallic member 18 for compensating the ambient temperature, by means of which the position of the operating bimetallic member may be adjusted in relation to the switch 17 upon which it acts. All three units 12, 13, 14 are adjustable together by means of a toggle 19.
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The switches 17 are snap switches which snap Lrom the position shown for the units 13 and 1/1 in-to the position shown ~or the unit 12 ancl remain in this posi-tion until.they are forced back into the position shown . for the units 13 and 14 by means of an external activa-tion means which is indica-ted here as a manual press-button activation means 20.
In the illustrated embodiment the heating means 16 o~ the operating bimetallic mem'ber 15 are joined to a connection 21 of a domestic power supply network and communicate with a contact 22 of the swi-tch 17. The moving switch members 23 of the swi-tches 17 and the other counter-contacts 24, (which are contac-ted after the snapping of the switch member) are arranged in series in 15 such a way that a second connection-~ o-L the power supply network communicates either with the contact 22 or, by means of the switch, member 23 and the other counter-contact 24, with the switch member o~.-the next unit~
Fig. 1 al30 shows a power control instrument 25 ~or an electric cooker plate 26 which has a snap switch 27. ,The snap switch 27 is. activated by a bimetallic mem~er 28 heated .
~y ,a heating means 2~.. This is a pulsation power control instrument known ~ se which supplies power to -the heatlng ,.'.
resistance 30 of the electric cooker plate in pulses of a : :
duratio~ which ~ari.es depending on the adjustment. The power ~` . ' ' ' - . ' ' ' , hc . _5_ .
., .
: ''. - ~ ' .
- ~ :' ' :- ' ' - : .- , con-trol instrument is also adjustable by means of the toggle 19 by means of which the time switch mechanis~
is also adjuste~. The hea-ting means 29 of -the power control instrument is switched by the ti~e switch mec-hanism ll and is connected to the contac-t 24 of the last unit lL~ of the time switch mechanis~. The other pole of the heating means 2~ is connected via the swi-tch 27 of the power control instrument to the connection 21 so that -the heating means of the power control instrument switches itself.
The -time switch mechanism shown in Fig. 1 is designed as a device for starting cooking with a power-controlled cooker plate. With these cooker plates, the power is adjusted manually and steplessly9 so that with adjustment to a lower continuous cooking value which usually lies in the order of magnitude below a quarter o:E the total power of -the cooker plate, init-ial cooking would take a very long time. The time switch mechanism ll is -therefore de-signed to prevent pulsation, tha-t is to say the perlodic 0 turning on and off of the switch 27 of the power control -instrument 25, for a predetermined initial cooking period.
In the time switch mechanism according to the invention the coupling between the adjustment of the power control instrument and the time switch mechanism is advanta~eously 5 such that for the dura-tlon of the inltial cooking phase the hc -6- ~
.
~ .
,, ~ ' ~'' :: .' " ' ' . : , .: .
.- . - ~ ~ - ' , . ' . , ' ' . ' full power of the electric cooker plate according to the adjusted continued-cooking power is appliecl. This takes into consideration the fact tha-t the housewi~e, when using a saucepan with large amount of contents requiring a long initial cooking -time, normally also adjus-ts the continued cooking power higher than with a smaller amount of material to be cooked.
The -time switch mechanism shown in Fig. 1 operates as follows. ~fter adjusting the desired power and thus also the running time of the time switch mechanism by means of the toggle 19, the pivotally mounted bimetallic members composed of compensation bimetallic member 18 and opera-ting bimetallic member 15 are brought into a predetermined positlon in relation to their switches 17. Following the previous-initial cooking procedure, all switches 17 were in the position shown with the unit 12, that is to say the switch ~embers 23 were connected to the contacts 2~, The housewife now starts up the initial cooking operation by A activating the press-button ~. The switch members 23 of all three switches 17 are thus ~ade to snap over in an anti-clockwise direction and are now in contact with the con-tacts 22. The heating means 16 of the operating bimeballic member 15 is thus ~irstly switched on with the unit 12 and upon completion of the heating-up time of the bimetallic member 15, which i9 preferably selected to be quite long, hc ~7~
. . . . .
. - , . . . . . ...
. : . . : :' ' .
. ~
the bimetallic member 15, in accordance with its ad-justment by the adjusting device 31 ac-tivated by -the toggle 19, brings the switch member ~3 of the switch 17 to snap into the position shown in Fig. 1. The heating means 16 of the unit 12 thus becomes ~ree from current and the operating bimetallic member cools down again, but does no-t cause the switch member 23 to snap back into the previous pOSitiOIl owing to -the action oi the switch 17.
It should be noted that the heating means 16 of the unit 13 is thus switched on and now also carries out the operating cycle described above. A-fter switching over the switch 17 of the unit 13, the unit 14 is started up in the same way, and aft0r the unit lL~ has been swit-ched, the heating means 29 of the power control instrument 25 receives current via the three switches 17 of the time switch mechanism with their switch members 23 and 24, and the normal pulsation operating of the power control instrument is initiated.
It should there~ore~-be noted that with the time switch mechanism according to the invention, the switching times of the individual units 12, 13, 11~ add up so that consider-able maximum periods are achieved. However, owing to the adjustability of all $hree units, thls period can also be adjusted to small values if desired. It would of course hc -8-~ , '~
8~
also be possible to make only individual uni-ts adjust-able and allow some (the basic time, so to speak) -to run cons-tantly. It is also feasible -to perform the turning on operation by means of an al-ternative type of activation (for example by means o~ a rotatable ~ember or by means of cams) instead of using the pressure activation means 20. Furthermore, it is -Leasible to switch the switch 17 into its starting posi-tion as soon as the toggle 19 is turned back to zero. In this case, the time switch mechanism would run automatically with each initial cooking operation, Figs. 2 and 3 show an embodimen-t oi a time switch mechanism 11~ which has only two units 12', 13~. It is placed in a substantially square flat housing 32 which is sealed with a cover 33 through which passes an adjus-ting shaft 34 in the direction of its smallest dimension.
Owing to its flat struoture, -the time ~witch mecha-nism lll is particularly suitable for use as an adaptor switch for a power control instrument, that is to say a power control instrument of the same basic dimensions can be j,oined directIy on to its rear and thus be made into a block with the tlme switch mechanism. The adjus-ting shafts of both instruments can engage in each other.
- ~he adjusting shaft 34 can be rotated by the toggle 19. Furthermore, the toggle 19 may be'pressed towards the hc -9-~ ,, .
. ~ :
time switch mechanism so that it presses a tube 35 against the force of a compression spring 36 .surrounding the adjust-ing shaft. The tube is joined to a resetting cam 37 with two oblique surfaces 38 for resett:ing the switch members 24 of the switches 17.
The operating bimetallic members 15 of the two units 12', 13' are arranged parallel to each other on opposite sides of the adjusting shaft 34, transversely to its axis, and are pivotal about shafts 39 extending parallel to the adjusting shaft. Swivelling levers ~1 are pressed on to an adjusting curve 42 fixed on the adjusting shaf~ 34 by means of an angle piece and com-pression springs 40O The swivelling levers are also formed of bimetallic material and form the compensation bimetallic members.
The heating means 16 of the operating bimetallic members 15 are of large thermal capacity and are designad with relatively wide heat coupling from the bimetallic members, so that the time constants of the bimetallic member are relatively large. The power can be supplied to these heating means either by means of the shafts 39 or the compression springs 40 or by means of separate moving supply lines.
The free ends of the operating bimetallic members 15 act ~y means of adjusting screws 43 which also form the contacts 22 on the switch members 23, The members 23, as : -- 10 --.~.....
. .
- .
-:
, '' ~ . ' .
shown par-ticularly in Fig. 3, consis-t oL flat plates having tapering edges which rest on a single-thrus-t bearing 44 and on a C-shaped spring 45 which puts the switch member 23 under an ini-tial compression. Each spring 45 is supported at its other end on one oL the single-thrust bearings 44. The switch members 23 co-operate with two fixed counter-contacts 24 which ars separa-ted by an insulating wall and are arranged back to back between the two switches 17 arranged in a mirror image relationship. The switch members 23 each have a projection poin-ting toward the centre of the switch, on which projection bevelled tabs 46 are formed which are able to co-operate with the resetting cam 37 when the switch member is snapped over into the position in which it contacts its counter-contact 24. Since the dead-centre of the bow-spring 45 is overstepped when the switch member is snapped over to this position, the switch member 23 does not spring back in-to the starting position shown when the bimetallic member cools down and re-adopts the outward-pivoted position shown.
. It should be noted that the design of the switches 17-is particularly simple. Thus, the bimetallic heating means 16 make contact directly above the point of support, that-is to say the adjusting screw 43, and no special counter-contact is required. The construction of the time ' hc . ,, : .. -- .
: ~ . . . . ..... .
. . - , ~ . :
. .. : , -, . : , :
switch mechanisl~ is simple, requires -~ew mechanical and electrical components and is compac-t.
Although in the embodiment shown in Figs. 2 an~ 3, a successive switching Or two units ensures a sufl`icien-t period Ior initial cooking operations, it is possible to produce other desired period by means o~ a larger number oI units, Ior example iI the time switch mechanism is used for other purposes apart Irom controlling the initial cooking time of electric cooker plates.
-.
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. .... .
.. / , ..
hc -12- - -.
~ . ' ~ ' ' .
' ' ' ' '' .
. - .,,: ' '
Electric time swich mcchanism FIELD OF THE INVENTION
The invention relates to an elec-tric time switch -mechanism which operates with an electrically heated thermal expansion member9 for example a bimetallic member.
BACKGROUND OF THE INVENTION
Time switch mechanis~shave been proposed in which a heated bimetallic member activates a mechanical ratchet which, after heating the bimetallic member, releases a component under spring tension which advances one step.
Thus, several heatlng cycles and cooling cycles of the bimetallic member may be connected in succession, to pro-long the switching time in relation to the mere single heating of the blmetallic member. However,~ with- these time switch mechanisms, the switching time can only be adjusted in~steps and the mechanism is also relatively ; expensive and, like all mechanisms, is liable to break down and is-exposed to wear.
SUMMARY OF THE INVENTION
An object of the invention is therefore to provide ~ . .
a time switch ~echanlsmiwhich is simple and compact with an improved switching behaviour.
Aocording to the ~nvention there is provided an elec-25~ tric time switch mechanl~m comprising a plurall-ty of units .,: . . ~ : .
hc -2- ~
.
: ~ . - :. . . - . . , . . , .... : , .
' ' .... - : ' : .'.,.,. . . ' ' .': , . .
:. : : . .. . . ,. . : . ,:
;.,:' ', . ,'' .: ' ; - ,, .-, ~: ' ' ' "' : ' each having an operating thermal expansion memher, electrical heating means for the thermal expansion member and a switch which is activated by the thermal expansion member, the units being connected in series in such a way that the activation of a switch turns off the thermal expansion member heating means of the associated thermal expansion member and turns on that of the next following unit, the switches remaining in the activated state after activation and being resettable by external activation.
A cascade of thermal expansion members, for example bimetallic members, is thus provided each of which has a switch as the single mechanical member. An adjusting device can preferably be provided for stepless adjustability, by means o~ which adjusting device the position of at least one, and preferably all, of the bimetallic members can be adjusted in relation to the associated switch. The time switch mechanism can thus be adjusted steplessly to a period ranging from the shortest period up to the maximum period.
~O The maximum period can be long since the heating means of the bimetallic members may be designed so as to be affected by mass to have considerable thermal capacity or so as to be thermally inert. They also make the maxi- -mum p riod available, unlike those in which the same bi-metallic member is repeatedly heated, since the latter , - 3 -.. .. . . ..
- . . .. - . , , - - , .: .
: .
: :- -. , , . :, , :
- : , . -,~, . - .
.. : - ' ~ :,: ., . ~ - . : " ' , are not completely cooled during the following cyc:Les.
Although bimetallic members are referred -to primarily herein, the thermal expansion elements could -take some other ~orm, ~or example they could be expansion rods, tubes or the like, although bimetallic members are par-ticularly preferred owing -to their large bending capa-citites.
BRIEF DESCRIPTION OF TEIE DR~WINGS
Fig. 1 is a schematic circui-t diagram of a -time switch mechanism according to the invention with three units;
Fig. 2 is a plan view of an embodiment with two units; and Fig. 3 is a section along line III--III in Eig. 20 DESCRIPTION OF_PREFERRED EM~ODIM~NTS
Fig. 1 shows a time switch mechanism 11 comprising three units 12, 13 and 14 each of which has an operating bimetallic member 15, an associated electric heating means 16 and a switch 17. Each operating bimetallic member is provided with a compensation bimetallic member 18 for compensating the ambient temperature, by means of which the position of the operating bimetallic member may be adjusted in relation to the switch 17 upon which it acts. All three units 12, 13, 14 are adjustable together by means of a toggle 19.
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'.' ' .. . ~,': . -: ., . ''' ''' '' ~ -..
, : ,~ - - - . .. . .
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The switches 17 are snap switches which snap Lrom the position shown for the units 13 and 1/1 in-to the position shown ~or the unit 12 ancl remain in this posi-tion until.they are forced back into the position shown . for the units 13 and 14 by means of an external activa-tion means which is indica-ted here as a manual press-button activation means 20.
In the illustrated embodiment the heating means 16 o~ the operating bimetallic mem'ber 15 are joined to a connection 21 of a domestic power supply network and communicate with a contact 22 of the swi-tch 17. The moving switch members 23 of the swi-tches 17 and the other counter-contacts 24, (which are contac-ted after the snapping of the switch member) are arranged in series in 15 such a way that a second connection-~ o-L the power supply network communicates either with the contact 22 or, by means of the switch, member 23 and the other counter-contact 24, with the switch member o~.-the next unit~
Fig. 1 al30 shows a power control instrument 25 ~or an electric cooker plate 26 which has a snap switch 27. ,The snap switch 27 is. activated by a bimetallic mem~er 28 heated .
~y ,a heating means 2~.. This is a pulsation power control instrument known ~ se which supplies power to -the heatlng ,.'.
resistance 30 of the electric cooker plate in pulses of a : :
duratio~ which ~ari.es depending on the adjustment. The power ~` . ' ' ' - . ' ' ' , hc . _5_ .
., .
: ''. - ~ ' .
- ~ :' ' :- ' ' - : .- , con-trol instrument is also adjustable by means of the toggle 19 by means of which the time switch mechanis~
is also adjuste~. The hea-ting means 29 of -the power control instrument is switched by the ti~e switch mec-hanism ll and is connected to the contac-t 24 of the last unit lL~ of the time switch mechanis~. The other pole of the heating means 2~ is connected via the swi-tch 27 of the power control instrument to the connection 21 so that -the heating means of the power control instrument switches itself.
The -time switch mechanism shown in Fig. 1 is designed as a device for starting cooking with a power-controlled cooker plate. With these cooker plates, the power is adjusted manually and steplessly9 so that with adjustment to a lower continuous cooking value which usually lies in the order of magnitude below a quarter o:E the total power of -the cooker plate, init-ial cooking would take a very long time. The time switch mechanism ll is -therefore de-signed to prevent pulsation, tha-t is to say the perlodic 0 turning on and off of the switch 27 of the power control -instrument 25, for a predetermined initial cooking period.
In the time switch mechanism according to the invention the coupling between the adjustment of the power control instrument and the time switch mechanism is advanta~eously 5 such that for the dura-tlon of the inltial cooking phase the hc -6- ~
.
~ .
,, ~ ' ~'' :: .' " ' ' . : , .: .
.- . - ~ ~ - ' , . ' . , ' ' . ' full power of the electric cooker plate according to the adjusted continued-cooking power is appliecl. This takes into consideration the fact tha-t the housewi~e, when using a saucepan with large amount of contents requiring a long initial cooking -time, normally also adjus-ts the continued cooking power higher than with a smaller amount of material to be cooked.
The -time switch mechanism shown in Fig. 1 operates as follows. ~fter adjusting the desired power and thus also the running time of the time switch mechanism by means of the toggle 19, the pivotally mounted bimetallic members composed of compensation bimetallic member 18 and opera-ting bimetallic member 15 are brought into a predetermined positlon in relation to their switches 17. Following the previous-initial cooking procedure, all switches 17 were in the position shown with the unit 12, that is to say the switch ~embers 23 were connected to the contacts 2~, The housewife now starts up the initial cooking operation by A activating the press-button ~. The switch members 23 of all three switches 17 are thus ~ade to snap over in an anti-clockwise direction and are now in contact with the con-tacts 22. The heating means 16 of the operating bimeballic member 15 is thus ~irstly switched on with the unit 12 and upon completion of the heating-up time of the bimetallic member 15, which i9 preferably selected to be quite long, hc ~7~
. . . . .
. - , . . . . . ...
. : . . : :' ' .
. ~
the bimetallic member 15, in accordance with its ad-justment by the adjusting device 31 ac-tivated by -the toggle 19, brings the switch member ~3 of the switch 17 to snap into the position shown in Fig. 1. The heating means 16 of the unit 12 thus becomes ~ree from current and the operating bimetallic member cools down again, but does no-t cause the switch member 23 to snap back into the previous pOSitiOIl owing to -the action oi the switch 17.
It should be noted that the heating means 16 of the unit 13 is thus switched on and now also carries out the operating cycle described above. A-fter switching over the switch 17 of the unit 13, the unit 14 is started up in the same way, and aft0r the unit lL~ has been swit-ched, the heating means 29 of the power control instrument 25 receives current via the three switches 17 of the time switch mechanism with their switch members 23 and 24, and the normal pulsation operating of the power control instrument is initiated.
It should there~ore~-be noted that with the time switch mechanism according to the invention, the switching times of the individual units 12, 13, 11~ add up so that consider-able maximum periods are achieved. However, owing to the adjustability of all $hree units, thls period can also be adjusted to small values if desired. It would of course hc -8-~ , '~
8~
also be possible to make only individual uni-ts adjust-able and allow some (the basic time, so to speak) -to run cons-tantly. It is also feasible -to perform the turning on operation by means of an al-ternative type of activation (for example by means o~ a rotatable ~ember or by means of cams) instead of using the pressure activation means 20. Furthermore, it is -Leasible to switch the switch 17 into its starting posi-tion as soon as the toggle 19 is turned back to zero. In this case, the time switch mechanism would run automatically with each initial cooking operation, Figs. 2 and 3 show an embodimen-t oi a time switch mechanism 11~ which has only two units 12', 13~. It is placed in a substantially square flat housing 32 which is sealed with a cover 33 through which passes an adjus-ting shaft 34 in the direction of its smallest dimension.
Owing to its flat struoture, -the time ~witch mecha-nism lll is particularly suitable for use as an adaptor switch for a power control instrument, that is to say a power control instrument of the same basic dimensions can be j,oined directIy on to its rear and thus be made into a block with the tlme switch mechanism. The adjus-ting shafts of both instruments can engage in each other.
- ~he adjusting shaft 34 can be rotated by the toggle 19. Furthermore, the toggle 19 may be'pressed towards the hc -9-~ ,, .
. ~ :
time switch mechanism so that it presses a tube 35 against the force of a compression spring 36 .surrounding the adjust-ing shaft. The tube is joined to a resetting cam 37 with two oblique surfaces 38 for resett:ing the switch members 24 of the switches 17.
The operating bimetallic members 15 of the two units 12', 13' are arranged parallel to each other on opposite sides of the adjusting shaft 34, transversely to its axis, and are pivotal about shafts 39 extending parallel to the adjusting shaft. Swivelling levers ~1 are pressed on to an adjusting curve 42 fixed on the adjusting shaf~ 34 by means of an angle piece and com-pression springs 40O The swivelling levers are also formed of bimetallic material and form the compensation bimetallic members.
The heating means 16 of the operating bimetallic members 15 are of large thermal capacity and are designad with relatively wide heat coupling from the bimetallic members, so that the time constants of the bimetallic member are relatively large. The power can be supplied to these heating means either by means of the shafts 39 or the compression springs 40 or by means of separate moving supply lines.
The free ends of the operating bimetallic members 15 act ~y means of adjusting screws 43 which also form the contacts 22 on the switch members 23, The members 23, as : -- 10 --.~.....
. .
- .
-:
, '' ~ . ' .
shown par-ticularly in Fig. 3, consis-t oL flat plates having tapering edges which rest on a single-thrus-t bearing 44 and on a C-shaped spring 45 which puts the switch member 23 under an ini-tial compression. Each spring 45 is supported at its other end on one oL the single-thrust bearings 44. The switch members 23 co-operate with two fixed counter-contacts 24 which ars separa-ted by an insulating wall and are arranged back to back between the two switches 17 arranged in a mirror image relationship. The switch members 23 each have a projection poin-ting toward the centre of the switch, on which projection bevelled tabs 46 are formed which are able to co-operate with the resetting cam 37 when the switch member is snapped over into the position in which it contacts its counter-contact 24. Since the dead-centre of the bow-spring 45 is overstepped when the switch member is snapped over to this position, the switch member 23 does not spring back in-to the starting position shown when the bimetallic member cools down and re-adopts the outward-pivoted position shown.
. It should be noted that the design of the switches 17-is particularly simple. Thus, the bimetallic heating means 16 make contact directly above the point of support, that-is to say the adjusting screw 43, and no special counter-contact is required. The construction of the time ' hc . ,, : .. -- .
: ~ . . . . ..... .
. . - , ~ . :
. .. : , -, . : , :
switch mechanisl~ is simple, requires -~ew mechanical and electrical components and is compac-t.
Although in the embodiment shown in Figs. 2 an~ 3, a successive switching Or two units ensures a sufl`icien-t period Ior initial cooking operations, it is possible to produce other desired period by means o~ a larger number oI units, Ior example iI the time switch mechanism is used for other purposes apart Irom controlling the initial cooking time of electric cooker plates.
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Claims (19)
1. An electric time switch mechanism comprising a plurality of units each having an operating thermal expansion member, electrical heating means for the thermal expansion member and a switch which is activated by the thermal expan-sion member, the units being connected in series in such a way that the activation of a switch turns off the thermal expansion member heating means of the associated thermal expansion member and turns on that of the next following unit, the switches remaining in the activated state after activation and being resettable by external activation.
2. A mechanism according to Claim 1, wherein the thermal expansion members are bimetallic members.
3. A mechanism according to Claim 2, comprising an adjusting device for stepless adjustment, by means of which adjusting device the position of at least one of the bi-metallic members may be adjusted relative to the associated switch.
4. A mechanism according to Claim 3, wherein the position of all bimetallic members is variable in relation to their switches by means of the adjusting device.
5. A mechanism according to Claim 2, wherein said plurality of units includes a last unit, and wherein the switch of the last unit is adapted to switch an output line of the mechanism.
6. A mechanism according to Claim 2 wherein the switches are bistable snap switches.
7, A mechanism according to Claim 2, wherein the operating bimetallic members are provided with compensation thermal expansion members.
8. A mechanism according to Claim 2, wherein the heating means of the operating bimetallic members are designed so as to be affected by mass to have considerable thermal capacity or so as to be thermally inert.
9, A mechanism according to Claim 2, comprising two units whose operating bimetallic members with their respective heating means are arranged on opposite sides of an adjusting shaft projecting between them.
10. A mechanism according to Claim 9, wherein each operating bimetallic member is pivotally mounted on a pivotal mounting with their heating means.
11. A mechanism according to Claim 10, wherein each said pivotal mounting comprises a swivelling lever which contains a compensation thermal expansion member and which lies against the adjusting shaft on which an adjusting cam is fixed.
12. A mechanism according to Claim 9, wherein each switch has a moving switch member which is supported in a support mounting, is urged against the support mounting by a spring under an initial compression and is snappably mounted between a contact which moves with the operating bimetallic member and a fixed counter-contact.
13. A mechanism according to Claim 12, wherein each said spring is bow-shaped.
14. A mechanism according to Claim 12, comprising mechanical pressure or rotating activation means for resetting the switch members.
15. A mechanism according to Claim 12, wherein the switch members are arranged substantially parallel to the adjusting shaft.
16. A mechanism according to Claim 3 having a backside and a mounting means on said backside, a control instrument for electric cooker plates being mounted on said backside, whereby said mechanism comprises an adaptor switch for said control instrument.
17. A mechanism according to Claim 16, wherein the adjusting device is adapted simultaneously to effect the desired value adjustment of the control instrument.
18. A mechanism according to Claim 16, comprising manual activation means for effecting both resetting and switching of said switches in an initial cooking operation.
19. A mechanism according to Claim 2, comprising two units whose operating bimetallic members with their respective heating means are arranged on opposite sides of an adjusting shaft projecting between them, and wherein each switch has a moving switch member which is supported in a support mounting, is urged against the support mounting by a spring under an initial compression and is snappably mounted between a contact which moves with the operating bimetallic member and a fixed counter-contact, and wherein the switch members are arranged substantially parallel to the adjusting shaft.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772730466 DE2730466A1 (en) | 1977-07-06 | 1977-07-06 | Instrument measuring speed or length of continuously moving material - has variable high-pass filter whose cut=off frequency is controlled by oscillator |
| DEP2730466.7 | 1977-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1114486A true CA1114486A (en) | 1981-12-15 |
Family
ID=6013251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA306,794A Expired CA1114486A (en) | 1977-07-06 | 1978-07-05 | Thermic timing mechanism |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1114486A (en) |
| DE (1) | DE2730466A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3401535A1 (en) * | 1984-01-18 | 1985-07-25 | Gesellschaft für Strahlen- und Umweltforschung mbH, 8000 München | METHOD AND CIRCUIT ARRANGEMENT FOR THE CONTACTLESS REAL-TIME DETERMINATION OF SPEEDS |
| DE9014814U1 (en) * | 1990-10-26 | 1991-02-14 | Mesacon Gesellschaft Fuer Messtechnik Mbh, 4600 Dortmund, De |
-
1977
- 1977-07-06 DE DE19772730466 patent/DE2730466A1/en not_active Withdrawn
-
1978
- 1978-07-05 CA CA306,794A patent/CA1114486A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2730466A1 (en) | 1979-01-18 |
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| MKEX | Expiry |