DE1622845A1 - Fog lamp - Google Patents

Description

DR.-ING. ■ - D.PL .-. NS.M.SC, :: Λ "" DIR ^ PHYS. DR. PTPL.-PHYS.

HOGER - LEGAL RIGHT- GRIESSBACH - HÄECKER

PATENT LAWYERS ,! N STUTTOART: "..-- '.'.

A.36 219 b. ^r V ---- ■ ■: - ': - -' ■ "■■■""■■■■-" /:. "■ -: b -155 ■ ■" ■■■ "■■ Vv,. ■;. ■;. - .- ,, ■■, .. ... ^: 27, Feb. 1968

MARSHAIä "F" DEPUTY Council Bluffs, Iowa, tJ.S ^ A. Fog lamp

The invention relates to a fog lamp, in particular for motor vehicles, ships or the like.

When a ray of light is directed into the nebula, it scatters this the light and so creates a diffuse and milky zone, in which the enlivening contrasts are reduced, with their help one can recognize objects. When the intensity of the light? , atrahß is increased, ao the milky zone in the the same measure and thus compensates for any improvement in visibility that would otherwise exist. When using normal Light rays is therefore the visibility in the fog on kuree Distances are limited. Various methods and devices have now become known which can be used to attempt has to eliminate the disadvantages mentioned and to increase the visibility -in fog, but so far none has been satisfied-

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positional solution to the problem.

One attempt is to put a color filter in front of a lamp, yellow colored filters are preferred; such lights however, have a limited intensity. The optimal intensity for a yellow-colored lamp, for example, is only approximately

110,000 lumens, and penetrates at such an intensity -continuous V yellow light produces a medium density nebula only. About 7.5 m wide. It was also found that at higher intensities the yellow light than about 110,000 lumens the scattering of light, i.e. the generation of diffuse light increases to a point where the kilchiness is even higher and the visibility further is decreased. As a result, fog lights with colored filters only bring relatively short visibility. are therefore only suitable for motor vehicles with lower ones Speeds; Such lights are completely inadequate. on ships that are therefore equipped with wheels instead of lighting, -; _ « directions are equipped. ^:,}

Lift filter lights are also known to work discontinuously, i.e. pulsating light sources, however their intensities are also relatively low

0Q3831 / 053 1 ^ ⁰ ^ Sa, ** ³ ""

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setit. If a constant beam of light is directed into the mist, so the diffuse light amplifies itself and thus leads to one extraordinary extent of the milky zone. If, however, a pulsating light source is used in which the intensity is reduced periodically so that the diffuse Light not as fast as with a constant light source. Increase can »so the milky zone does not enlarge so quickly either. As a result, intermittent light penetrates fog above one greater distance than constant light; as well as with the use colored light also increases., with an intermitr, ^ actively working. Light source the milky zone when the intensity of the light beam is increased, and welcomes «© availability · - ,. "

The invention is therefore based on the object of a fog light su create, the light of which penetrates fog over a greater distance than is the case with the known luminaires. pie Invention Now look at a fog lamp with a light source and a filter off «and the task at hand is carried out according to the Invention characterized in that a modulator for the light beam, For alternating control of at least one main part of the Lientr beam «wipe one high and one essentially vanishing dendea intensity provided iat, laid that the modulator one

0Q9831 / 0S31 ν

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one

see nl & ht. what? Luminaires produce

that

also £ &? di®

That is big enough to avoid and Kl @ ia enough E ^ r to prevent the build-up of Eon ©. Appropriately, the

I © ts> @ l, leKehte with sin @ p light source by itself

■ -

© ine © rfindung ^ a suitable lamp does it? Wis intensity in the known _s increase but 'it allows di ©. Errr higher intensity than the well-known sttwifesfe © modulation functions 'prevented' - -. ©· i> aehtungsperson ÖMF ^ ts disturbing flickering., - · - but it saioht the structure a

ignites both-

fifth Seliiffeed. %!·, for example.,-

Signal signs »

Color filter for

In the following, there should also be various design features

described *

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Several diaphragm flights can be used as a modulator, which are coupled to one another at their ends and also, for example, from an electric motor ttb © 2? a Kuryenseheiben or The crank mechanism can be operated at the same time. You can choose between the light source and the "filter be arranged",: «nd - 'their actuation * The speed of movement depends on the light intensity> The degree of penetration of the NsSeIs, dessin density and other ¥ ertefi / at dense fog requires higher modulation speeds than in light fog «If the construction according to the invention a ship's lamp serves as a; .. βο it includes an ordinary one Search light as a light source, the movable screens are colored Filter, which is expediently in the beam path - and can be moved out. Thanks to the mobility of the filter the lamp according to the invention can be used as a search light as well can be used as a fog lamp. It is particularly useful if the power source provided for driving the diaphragms also fed an electromagnet that operates the filter, like that that when the diaphragms are put into operation, the magnet brings the filter into its active division, in which it is in the beam path of the light source is located

When using the lamp according to the invention on motor vehicles does it contain, for example, a sealed beam projector,

/ OE3t ^ ₆ .

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1822845

the movable screens "as well as a filter" and all these components can be accommodated in a single housing. It may be advisable to operate the cover leaf via the Soul of a flexible shaft provided with a protective lock or the like. " which is driven by a DC motor via a reduction gear. The latter can be connected to the battery or the vehicle's alternator must be connected. Must the regulation be fulfilled, because Kraftfahrseuge only has such lights May exhibit in pairs, so are two invention elements lights to be arranged, which are expediently mounted in such a way that both; -:

Idohtst -rahlen approximately pointed at the same place a @ a »use in pairs can be used for the diaphragms of each liquid manure with advantage it is half the "asimal speed of a ^" one lamp can be operated, and the aperture of one Luminaires are then open, while those of the others are closed are; * The effect of the two lights, which are Work shift, then corresponds to that of an Elnttelleuchte, whose apertures are operated at twice the speed.

In luminaires according to the invention, light sources can have different intensities

- ■ ^:. . ". £ or very. ■ ■ " ^ - "'- - ■ - . ■ ■■ ■'"".' up to BU 20 χ 10 lumens / can be used.

milky zones build up la fog, as is the case with the known

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8AD

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Glow is the case. Therefore, sources of light of higher intensity are also known to be used with greater force of penetration . When u @ HIFF "light _β in öenen @s ton © geeetslish * limiting the intensity jgifetr ₀ germinating them well over 20 χ 10 lianas are 'But even b®i Kraftfahrsetigen with lights, be" grenster intensity d @ £ 8 # far be increased beyond those values, ai © aeiftlusr feel l # bell @ n®htan in tra® & @ s sonet SU strong structures milehiig ^ g = i @ si @ ss d £ ©. @ Ξ% ϋ @@ & iS, d © t © Bj theeaö lay

since then at about ZZQ 000 L «aaen _s siSialioli 110,000

Luminaire · "■" ■ - - ■■. ";" "■" "· .." ■ "-. _

Further, advantageous ©

Make sure Kerknale den..Patentansprüchen mim.

n & oh the following description »the Ses? ^ purging some in the Drawing illustrated embodiments of the invention is used;

it «own: ■; . ■ ■ '■: ■. ._. V ^: -

Fig. 1 «in a Quereohniti; through a first statement of praise;

11g »2» in a section along the line 2-2 in Fig. 1;

Fig. 3 shows a "look like" perspective view - the filter Gate direction and the actuation magnets on a lamp,

as shown in Fig. 1;

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Fig. 4 a Sohaltschesia for the switching of the lamp gen. Fig. Ij

Fig. 5 is a cross section through a second embodiment an inventive lamp;

. € schenatisch® a representation, di @ seigt how the lamp Gea can be used in motor vehicles Figures · Fig. 5;

7 shows a circuit of a circuit of the lamp gea. Fig. 5; 8 shows a modification of the circuit according to FIG

9 shows a cross section through a third embodiment lamp according to the invention!

10 shows a front view of a fourth embodiment; Fig. 11 is a side view of the lamp according to Fig. 10; FIG. 12 shows a section along the line 12-12 in FIG. 11; 13 shows a section along the line 13-13 in FIG. 12;

14 shows a view of a section along the line 14-14 in Fig. 13 in grSfierea X & totab as these »and

Fig. 15 shows a rope in a section in grußerea scale * showing a diaphragm flap in a side view and the way it is attached to a slide. . . -

The fog lamp 10 shown in Figures 1 and 2 is particularly suitable for ships and it unfafts a fluff H ₉ in the light source 12, movable diaphragms 13, a filter 14 and a

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Lens 17 are arranged ·.

In the light source 12 is a conventional searchlight with a bulb 15 which is held in a socket 19 and for a parabolic mirror 16 and a Hilfsepiegel are provided 18th The parabolic mirror can be silver-plated and backed with copper or brass and provided with a corrosion-resistant coating. The auxiliary mirror 18, which can be horizontally displaced relative to the lamp 15, reduces the lost light and thus increases the intensity, but it also allows Also a good alignment of the light beam.Suitable ventilation means should serve to dissipate the meander at the light source, especially in the case of a high intensity laser.

In front of the light source 12, the diaphragms 13 are arranged, which interrupt the light beam and, for this purpose, pins 20 can be pivoted. Susi overslept you will sweckatftigerwsise around. swiveled down an angle of 90 degrees · In the closed position of the shutter, the light beam from the light source 12 is completely interrupted, so that the intensity drops to Hull, thus ensuring a liohtdiehten vevsehlu »in the closing ...,« »division »FcBanen dl · apertures 13 ftrlngffflgfg; V ν; wider «1s die Swisenenriuw *« wipe clean, \ : /

^ $ 09831/0531

"· '·" "" BAD ORIGINAL -' ^; ": | ^

A 36 219 b AQ

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so that the lower end edge 21 of each of the top three fluge1-shaped panels, the adjacent, underlying panel in the The closed position overlaps, while the lower end edge of the lowermost diaphragm 13 overlaps the bottom of the light source 12. if it is desired, the visor flights 1 can in particular be ribbed or be wavy.

The diaphragm blades 13 are coupled to one another via a connecting bracket 24, which in turn is driven by a crank 28 from an exsenter bracket 26. The latter drives an electronotoz »30, which can be a» normal 12-volt glelchetrom «otor with 1 * 00 - ΙβΟ © revolutions per minute. For . the drive of the Exeenfcer can also be a 24 or 32 volt oleiotietroewtor or "in llg-Yolt-Weohselatranpctorgorgesehon •• in. Bin · well «32 wbiisde * ei · Essenteiweaeib * H » it »ine« -üntert «t« meei «» ri «b · Jt _t » it 4 ···· η Help · ei · Dreheahl der Ex- - ! • ntereoheib «on dl · g« wishes9, optl »al« Drehsahl v «raugt -

the aperture is there filter 14 _v by the sieve gate

»«! »M, a eelbl ^ fi ^ BTEE," oeenaimtts Potaetallglas or UM a blaaeef "rbtes AU haadelt *. Ss is in a

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Haltuns 23 assigned and revolves around a central axis of an operative position, which is shown in Fig. 2, in a Pivot ineffective Stelltötig, which is shown in Fig. 3 in dashed lines. The filter can be mounted in the housing 11 and in the filter holder 23 in any suitable manner, for example with the aid of an axle and bearings. The filter is activated by a solenoid 36, which is from the same power source as the electric motor 30 is fed. Between the solenoids and the filter is provided with a standard oil lever rod 38 "

At the lens 17 through which the filtered light

it is preferably a converging lens made of a heat-resistant,.

clear glass or another suitable material.

When the motor 30 is turned on, it operates the shutters 13. The electromagnet 36 looks at the same time and swings it Filter 1 * in its effective position. When the electric motor is switched off, the diaphragms come to a standstill and the electromagnet falls off, whereby the filter is surfiekgesohvenkt again in its inoperative position. In this position it interferes with the light of the Light source 12 not »so there * then the lamp 10 as usual -

works. ...

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The one in Pig. The circuit shown in k is suitable for the lamp 10. A power source 40, which can be used via a conventional accumulator, feeds the lamp 15, the electric motor 30 and the actuating magnet 36 via a two-pole switch 42 in three positions. 4 the switch 42 assumes its off position. If it is switched to its first "effective position", only the slat 15 is live. If it is finally switched to its first position, then all components of the circuit are connected to the battery voltage. Holding the motor 30 and the actuating magnet 36 on the same side causes the diaphragm pin 13 to move and the filter 14 to be pivoted into its effective position »But that there is a delay of about a minute» which elapses »after the laope has been switched on and before the motor and the actuating magnet -. be switched on. The light then gets through the filter glass. " only a small part of its surface is directly exposed to the light beam »so that the filter cannot be subjected to thermal shocks». '...

Fig. 8 shows a modified circuit for the lamp 10 » in which a diode 44 Susanne with a single pole switch 46

- 13 -

9831/0511 _______ ■

A 3 € 219 b fi & ■■■ ': ■■ ~ -Tef *:

b - 155.: ^{; ■:} s "-" - ■ -: - - \: - * 27 Feb.1968

is used with three positions. Here, too, the figure shows itself the switch back in its off position ..- W £ 2? d ®s? in his

first »effective position gebraolit ^ .s® · lies' isdigiieh M © Xampe

15 on voltage; in, its widespread St © lliiBg ^ © ^ © sa
apart from the lamp 15 äü @ fo, n'oeh / the other E% ®mm% ®

Although the optimal Qeaohwisid3.gkeife.d0r-'blenden : y <m i @ r
Visibility and the 'Dicht © , mü Art des Lever- äb & Ingtj, ■ -fnwto but determined that it is appropriate for the purpose

Melits gwigchen 12 and 42 light flashes per sec ^ md ©. lies.
At a

ity of about 12.-χ. ίθ · Lu ^ ß 'siasi 4ä »dusföii das-

incoming light have an intensity of approximately β χ 10 Luneü _; the speed of simulation caused by the diaphragm blades should be between about 3 ¹ * and 38 light flashes per second ". -.-; /; "" -.- ■ -. ■ '-. j-; ■■■ ^ ".-" ■ / λ; ^";>;." ■ · "*": ■, ■ =

Pie Pig. Figure 5 shows a further embodiment of a lamp 50 according to the invention which is particularly suitable for motorists' eyes. Similar to the lamp 10, this embodiment also contains a light source 52, movable diaphragms 5 ^ and a filter 56 «
All of these elements are included in an Oehfiuse58, the

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ei © ψ <&%> - §> © teäfei wiü moisture protection.

52 acts © a see uas an over high sealu £ © si © frequently used in power fan ^ s days.

t liogt vorsugivti8e..8i9i8eben 1700 000 and 1900 000 · Bldßiifea 5 ^ are Eä? e © k5aiBig @ ^ w © is "leaf" or wing-'lb) iM © t wiu in a horizontal position parallel to each other

Si @ έι © ι? ^ Θβι te Ü!? Syllable! I M © ä, s @., Attached like the Bl @ siä © ß 13 ö © E "■ Lsiaehte 10 _& © feli <sßi sitteis one of an electro -

In this case, however, the housing 58 is housed "but at a distance from the lamp 50". With the filter *} & hMS @ lt ®b si®li -. Voi'BUgweise over a yellow-colored potxoe1 "all ^ ts ^., glas od @ r m © in "blitte" - & las | it is in oegensats sum filter l4 of the luminaire IO faetsKWitierto As a result, the luminaire 50 is mainly used as a fog lamp, because it can use the "Wei -Filtlonen of" I ^ uehfce XO not meet; -With a sealed bean ^ Laape of the first Inteneitscht as well as the filters described

shows the Meb @ lies | iOh1ie; .v'5O an intensity of about 9 ^ 0, ^ 900 ,, ^

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The screens 5 * are mounted horizontally instead of vertically in the luminaire 50, since such an arrangement prevents light from being reflected out laterally in the Oegensats su a vertical mounting UUt t. Lateral reflection is, however, extremely undesirable with iraftfahrseugscheiinferii »Furthermore, the diaphragms slept by tilting the vision downwards» so that no light can be reflected out of the light from above »what ^ bj ^ XräS tfahrseugseugsewe & fern. also iftynsent w & re »da diiji sieve line of the driver in allgenejüaen

4 den

lies.

the gesetslicha "ii © a? ecferiffc" si as a rule sur

also the light 50 ia

in pairs so MonHlt ^^ Jlafi both ^% uf Seseibestelle ■ eug are directed ·. How? Ig «6 shows a set table old swel lights 50,""jd ^ e tttttber a flexible Velle ait Schuts«. ; _v i aohlaoeh 62 aait eln ^ a.lMi ^ rsetsungeg · drive 64 coupled which in turn is driven by an electric gate 66. the flexible shaft .6 ^ is it look tm such "how iai lioraalerweise place * as StAhaeaterweile Terwendun ^. You think _{that the} end of the shaft 61 is connected to the end of this shaft that is opposite the end of this shaft, which is coupled to the Sxsenterseheibe.

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5 shows the eccentric disk 60 and the shaft 61, but not that end of this shaft to which the flexible shaft 62 is connected. When using a lamp that is behind the filter have an intensity of approximately 940,000 lumens, the best visibility in fog results from a modulation speed of the light beam between approximately 23 and 26 Flashes of light per second. As in motor vehicles normally Two lights are used, the bezels of each light can hit a modulation speed of approximately 11.5 to 13 light flashes per second are operated because the diaphragms of the one luminaire is closed when those of the other are open · A combination of two such, out of phase Lights then leads to the optimal modulation speed of 23 to 26 flashes of light per second. With such a construction a larger gear ratio of the reduction gear is required if the same motor as in the light 10 should be used.

The legal regulations do not allow a complete either Darkening of the lights of a motor vehicle. As a result, you can the diaphragms 54 are arranged so that in their closed position they still leave narrow Schlitze.freilassen through the

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Can pass through it with an intensity of approximately 630 lumens. Another way to customize de? A light fitting in accordance with the statutory provisions consists in the use of an auxiliary lamp 59 with, for example, 300 luster inside the housing 58, which is arranged in such a way that it is not covered by the screens. .> _ _; .ν- ,.

The circuit diagram for oil lamp 50 shown in FIG. 7 comprises a power source 67, a switch 68 for switching on and off, the lamps 52 and 59 and finally the electric motor 6. If the switch 68 in Sffins one ehalte division, born ^ aCiJt ₉ £ © lie -., Both lamps, .alsCaueb the "lotus" on / voltage. \

9 shows a third embodiment of a lamp 70 according to the invention, which has a light source 72 as beispieissweiee that of a search light, a filter 7 ^ and diaphragms 76 © nfchSlt, velchletstere Can be rotated over an angle of full 360 degrees can and thereby. from the panels 13 and 5 $ of the lights ■ 10 and 50 differentiate, with each orifice there is a spur gear 78 connected »that k & amt * Die with the neighboring spur gears Lamp 70 is driven by an electric motor 79, namely About another spur gear 80, which is connected to the lowest of the spur -,

8 ί t AO ε st; _{β ι8. L.}

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pfider 78 Äife. The diaphragms 76 open with every full revolution twice, s® that there are two flashes of light for each revolution. / 'The Sahaltimg sur lamp 70 is similar to that in Pig. 7 shown, The only difference is that the help lamp 59 is omitted became.

In the case of the lamp 70, adjacent diaphragms rotate in reverse Direction, while with the lights 10 and 50 all Open and close diaphragms in the same swivel direction.

- is reflected in the L © uefot® T © Ment both upwards and after Mater »from the LMimstm © ter, which is the case with the 1 © ®ai 5 @ _sii © at the case, so that the lamp 70

is not used for motor vehicles. at Ships li @ g & However, the light often above the steering position, i.e. «About d @ s? Line of sight of an observer, so here a sliding out of the light upwards does not disturb.

In the embodiment of a motor vehicle bell lamp 100 according to the invention shown in FIG. 10 to 15, a sealed-beam lamp 104, a filter 106 and diaphragm blades 103 to 116 are mounted in a main housing 102, with the latter mounted between the laaqpe and ®m Filters lie. Instead of the five shown

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Aperture blades can of course be used more or less “The diaphragm blades 110 to 114 are all the same Linge »while the diaphragm wings 108 and 116 are kdrser ·

The diaphragm blades are in turn in a housing 118 and are mounted between retaining brackets 120 and 122, which are necessary Screws or the like are attached to the housing 118. Each diaphragm blade rotates about a central axis 108 * to 116a (see, for example, Figures 12 and 15) and the ends of these central axes are in Weher in the Haltebtigeln '120 and 122 ·

The diaphragm leaves are operated by means of a slide 124 » the waiter one at a time. lugs 126 is coupled to the diaphragm flanges (see particularly FIGS. 12 and 15). The slider is pushed up and down by a crank mechanism 128 in the housing; the crank gear includes a crank cup en 150 * which is eccentric is attached to a Bxsentersohei.be 132 »as well as a shaft 134 · The crank pin 130 engages in a socket 136 provided in the slide 124 (Fig. 12). The shaft of the crank

"" ■ "■ - Bufshsa gear 128 extends through a> • - ^ 138 and is deprived of the soul 139 of a flexible shaft 140 with a cape tube ▼. The flexible shaft is in turn yon a Iy-

9. ■ - "" ■ -. * ■

009831/0531 -20-,

ORiQlNAi

Ä 36 219 b b - 135 -27. Feb 1968

Electric motor driven.

The slide 124 has openings 142 through which the ends of the Stretch through the Biendenflügel and that are big enough to use it the slide can be moved without hindering the diaphragm shutter.

As the slide 124 moves up and down, see the move Aperture blades from a horizontal position by about 80 degrees downwards, so that the fog lamp 100 according to the invention always. at least a small amount of light can escape, because in order to achieve a complete darkening, the diaphragm blades would have to be pivoted into an at least almost vertical position ^ JYes in addition, the diaphragm blades down into their closed position ·? are pivoted, the lamp 100 does not reflect any light upwards.

For each revolution of the crank mechanism 128, the slide 124 closes and opens the bend wings once, so that there is a lightning bolt per revolution. To generate from 11.5 to 13 Light flashes per second must be the number of revolutions of the Kurbeige " drives * are between "11.5 and 13 revolutions per second. A single motor drives the crank gears of both lights of a motor vehicle so that they have the same number of revolutions exhibit. w *.

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When using the fog lamp 100 in a ffl motor vehicle the visibility with a light lever is at least about 90 to 100 meters, while in a tight lever it is always 60 meters is still “This is a major difference compared to the known lights, when used the visibility limit in light fog at about 30 meters and is around 7.5 meters in thick fog

Of course, the lights according to the invention can be designed differently in many points than above. % e has been written "and they can also be used on plug tools" Size, shape and size of the screen elements can be varied as well as the various light sources, and the filters do not have to be yellow or blue-colored glasses Finally, the drive of the diaphragm elements and the adjustment of the filter can take place in a different way than described above. ..; -; ;.; V. . ; /.: .. · ■ / J ^ '- .; -: "_- ■ _";"......

-22- -

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Claims (1)

A 36 219 b b - 135 Feb. 27, 1968 Claims 1. Fog lamp with a light source and a filter, characterized in that a modulator for the light beam for alternately controlling at least a main part of the light * beam between a high and a substantially verseteissdesitei intensity is provided, and that the modulator is a ©! © delation speed ₉ which is large enough to avoid annoying flickering and small enough to prevent the build-up of a large milky zone. 2. Fog light according to AnsprsA ϊ, 'characterized in that ; . the Moäi & M & oF has a panel element that. * in s @ in®i? Ifis'kstellung advises at least the main part of the light beam ". 3 «lamp according to claim 2, characterized in that the Modulator has several diaphragm elements, which between Light source and filter are lying. ■ "■ '■■■ ' - * 4. Lamp according to claim 3, characterized in that the Panel elements run horizontally and parallel to one another and at the same time, from an open position over an angle. 00 9831/0531 A 36 219 b * <- - ■ «■■ - η - 135 * -y " Feb. 27, 1968 - Can be swiveled down from about 80 degrees. 5 luminaire according to one or more of the preceding claims, characterized in that the hodulation speed ... between 12 and 42, "preferably" between 23 and 26 light flashes per second. 6. LeuobtQ according to one »or more of claims 3 - 5» thereby characterized in that the diaphragm elements are coupled to one another via a displaceable member which is connected to a crank mechanism. 7 · lamp according to claim ₁ 6 characterized gekeims "iehnet _s that. a ,. Blektroeotor About the soul of a flexible mile adt a ί -. The central disk of the crank drive is connected. 8. Light according to claim 6 or 7 · sdt a colored Olairöäeas; - Filters and a light source, the intensity of which is approximately - ■ 9 * 0 000 lines, characterized in that the Ä ** - - - * aenterscheibe sdt an eccentrically attached pin in ^. -. • engages in a central slot of the sliding link ·, .. · • '009831/0531 ~? * ■ * /' A 36 219 b b - 135 Feb. 27, 1968 9. Light according to one or more of the preceding claims, characterized in that the filter can be displaced by means of a drive between an effective and an inoperative position. 10e lamp according to claim S _9, characterized in that the drive for adjusting the filter is synchronized with the diaphragm drive so that when the diaphragm drive is started up the filter is brought into its operative position and when the diaphragm drive is switched off in its inoperative position. 009831/053 1 is Blank page