DE2360250A1 - Pneumatically operated windscreen wiper and washer - has washing liquid valve which operates in step with wiper - Google Patents

Abstract

The windscreen wiper is operated pneumatically and the washing liquid is pumped to the windscreen. Washing liquid outlet nozzles are arranged on either side of the wiper blade. A distributing valve is fitted between a single inlet and two outlet lines of the washing liquid. This valve operates in step with the wiper movements so that liquid is sprayed on the windscreen in the path of the advancing wiper blade. The outlet nozzles of washing liquid are connected to the blade arm and the nozzle rows are held on both sides of the blade and connected by flexible tubes to liquid supply.

Description

Künchen, November 7th, 1973 TP11-sü / st
1132

ZNORE - BREMSE G. mbh
8 Munich 40, Moosacher Strasse 80

ⁿ Windshield wiper and washer system ".

The invention relates to a windshield wiper and washer system with a windshield wiper drive operated by means of pressure medium and pump-conveyed detergent, the detergent being supplied via one detergent supply line and two
Rows of detergent nozzles can be supplied, each of which is arranged on one side of the wiper blade.

In the known systems of the type mentioned are
as a carrier for the delivery of a detergent to the '.
Windshield nozzles provided on one side of the wiper blade, which distribute the detergent within the circle segment to be cleaned on the windshield. The disadvantage here is that, although the detergent is supplied over the entire area of the wiper blade of the windshield during one cycle of the wiping movements of the wiper blade, during the other cycle the windshield may be smeared due to the lack of detergent supply, which has a negative effect on visibility and when driving fast
Vehicles to dangerous situations in road traffic. can lead.

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To remedy this deficiency it was a requirement to to arrange nozzles on both sides of the wiper blade, which the detergent now during both wiping movement directions of the wiper blade fed to the windshield, resulting in good moistening of the wiper blade in both directions of movement and faster cleaning of the windshield was achieved. The disadvantage here is that with each cycle of the wiper blade the detergent, which over the in Direction of movement of the wiper blade facing away from the row of nozzles flows unused over the windshield, which in turn ' resulted in a disproportionately high and unwanted consumption of detergent.

The object of the invention is to create a windshield wiper and washer system which is powered by the drive pressure medium the windshield wiper operated no other drive means required, designed and simple in construction can be installed and works reliably with low detergent consumption.

This object is achieved according to the invention in that a with an input connection in the detergent supply line and two output connections for the detergent, which switch over in time with the wiping movements Shuttle valve is arranged, with the input connection to the detergent pump and alternately with this connected output connections to each side

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the wiper blade arranged rows of detergent nozzles of the wiper blade are connected, wherein the shuttle valve by means of shut-off devices arranged in it, switched directly or indirectly depending on the wiping movements the detergent only to the row of detergent nozzles at the front in the direction of movement of the wiper blade feeds.

In order to keep the wear and tear on the shuttle valve as low as possible Strive to switch the shuttle valve only when the washing system is actuated and thus throughput of detergent. To achieve this, it is expedient according to the further invention that the shut-off elements of the shuttle valve as two membranes are formed, which are parallel and spaced from one another with their radially outer edge in the housing of the shuttle valve are attached and that in support walls ._, which are assigned to the facing Meinbranflachen are, each one of the membranes coverable detergent supply and detergent discharge channel opens, the two Detergent supply channels jointly to the inlet connection and the detergent discharge channels separated from one another are each connected to an output terminal and that the facing away from each other membrane surfaces each limit a loading chamber, which alternately from the drive pressure medium of the wiper drive can be acted upon.

This pressure-dependent control of the shuttle valve ensures that it is only activated during the washing operation, but not

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while mere wiper operations are switched as it is for example, one that is mechanically controlled by the wiper drive Shuttle valve would be the case.

According to another embodiment according to the invention are the shut-off elements of the shuttle valve are designed as two coaxially arranged piston slides, which on each other facing sides of the detergent supplied via the input connection and on the other hand alternately to one another are acted upon by the drive pressure means of the windshield wiper drive, and each of them only in his the other Piston slide facing end position connected to one of the output connections, in its guide track covers the opening detergent channel by grinding.

In order to make the shut-off elements of the shuttle valve pressure-tight in their rest position with respect to the detergent supply channels, it is expedient according to the further invention to
that these are loaded by a constantly effective force, which is, however, kept so that it is less than the pressure of the detergent pump on the effective pressure surface
the shut-off devices.

In the drawing, the invention is explained using two exemplary embodiments, specifically showing:

1 shows a schematically illustrated windshield wiper and Washing system with a shuttle valve shown in section, the shut-off devices as Membrane are formed and

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2 shows a section through a further embodiment of a shuttle valve, the shut-off elements are designed as a piston valve.

According to FIG. 1, a compressed air line 2 leads from a compressed air reservoir 1 to a compressed air switch 3i which with a holding lever 4- is provided with its dashed line In position A only one windshield wiper drive 5 is actuated and in its position B a detergent pump 6 is also switched on. From the compressed air switch 3 leads a Compressed air line 7 to a control valve 8, which via One exhaust air line 9 and 10 each, each with a cylinder space 53 and. 54 - a cylinder 11 of the windshield wiper drive 5 is connected to alternate loading. In the cylinder 11 is j "e a pressure piston 12 and 13 is provided, which by means of a piston rod 14 are connected. On the piston rod 14- a bearing 15 is provided in which a windshield wiper arm 16 is rotatably mounted. The windshield wiper arm is pivotable in a fixed pivot point 17 and by means of a provided in the windshield wiper arm 16 longitudinal groove 18 to compensate for the radial displacement occurring during the wiping movements mounted longitudinally displaceable. By the length of the piston travel of the pistons 12 and 13 in the cylinder 11 is the size of the circle segment to be cleaned on the windshield 19 determined. From each of the compressed air lines 9 and 10 branches off a compressed air line 20 and 21, which with a housing 22 of a shuttle valve 23 are connected

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and to one actuation chamber 24 and 25 of the shuttle valve 23 lead. In the housing 22 of the shuttle valve 23 is a membrane 26 and 27 designed as a shut-off device is provided, which are parallel and at a certain distance from one another with their radially outer edge 28 in the housing 22 are attached. In the housing 22 support walls 29, 30 and 31 for the membrane 26 and for the membrane 27 are mirror images opposite support walls 32, 33 and 34 are also provided. The membranes 26 and 27 are each limited by a facing membrane surface 35 and 36, while one membrane surface 44 and 45 facing away from each other the loading chambers 24 and 25 limit which are alternately acted upon by the drive pressure medium of the windshield wiper drive 5. The membrane surface 35 is the Support walls 32, 33 and 34 and the membrane surface 36 are assigned to the support walls 29, 30 and 31. In the supporting walls 29,30 and 31 and into the support walls 32,33 and 34- opens One detergent each that can be covered by the membranes 26 and 27 - supply channel 37 and 38 and detergent discharge channel 39 and 40, the two detergent supply channels 37 and 38 together are connected to an input connection 41 of a detergent supply line 42, which by a detergent pump 6

is fed from a detergent reservoir 43. The detergent pump 6 is through a compressed air line 55, which can be switched on by the switch 4 in the switch position B, through the Drive pressure means of the windshield wiper drive 5 actuated. The detergent discharge channels 39 and 40 are each via one

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Output connection 46 and 47 are each connected to a detergent discharge line 48 and 49, which conveys the detergent to a wiper blade 50 provided on the wiper arm 16 and via a row of detergent nozzles 51 and 52 arranged on both sides of the wiper blade 50 in the cycle of the wiping movements, alternately i * ¹ direction of movement of the wiper blade 50 is supplied to the row of detergent nozzles 51 or 52 of the windshield 19 lying in the front.

In the position shown, the windshield wiper and washer system is in the operational rest position. The gear lever 4 of the switch 3 is' in the exhibition O and the Diaphragms 26, 27 of the shuttle valve 23 are in the blocking direction sealing on the detergent supply channels 37 »38 and detergent discharge channels 39.40. .

Upon actuation of the windshield wiper system 5 according to FIG. 1 '. When the shift lever 4 is switched to position A, compressed air flows from the supply air tank 1 via the compressed air line 2 into the compressed air switch 3, in which only the compressed air line 55 to the detergent pump 6 is closed, and further via the compressed air line 7 into the control valve 8, where the compressed air line 9 is closed according to the position of the pistons 12, 13 of the windshield wiper drive 5 and compressed air only via the compressed air line 10 into the cylinder space 53 of the cylinder 11 of the windshield wiper system 5 arrives and thus acts on the piston 12, whereby the pistons 12, 13 on the opposite side of the cylinder 11

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are pressed and the cylinder space 54 · into the atmosphere is vented via a vent valve (not shown here) in the control valve 8. The one with the piston rod 14- firmly connected wiper arm 16 now performs one of the Piston movement opposite movement in the counterclockwise direction to the left around the fixed pivot point 17i where when it is reached its end position reverses the control valve 8 and thereby the compressed air line 10 wears while opening at the same time the compressed air line 9 »whereby compressed air into the cylinder space 54 · of the cylinder 11 arrives and acts on the piston 13. At the same time, the other cylinder space 53 is released into the atmosphere vented and the piston 13 on the opposite Side of the cylinder 11 is pressed, whereby the wiper arm 16 again performs a clockwise movement opposite to the piston movement in the clockwise direction, where after reaching its end position, the control valve 8 reverses again, the control process already described alternately, determining the rhythm of the wiping movements of the windshield wiper arm 16, repeated.

When the windshield wiper and washer system according to FIG. 1 is put into operation, the shift lever 4 flows into the position B of the compressed air switch 3 compressed air from the supply air tank 1 via the compressed air line 2 into the compressed air switch 3 »in which the connection for the compressed air lines 7 and 55 is now open. via the compressed air line 7 the control valve 8 and at the same time the detergent pump 6 via the compressed air line 55 are acted upon. At the tax

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valve 8, the compressed air line 9 is closed according to the position of the piston 12,13, so that compressed air is only about the compressed air line 10 on the one hand into the cylinder space 53 of the cylinder 11 from the disk wise cable drive 5 and on the other hand Flows through the compressed air line 21 into the loading chamber 25 of the shuttle valve 23 and thus the membrane 27 is applied, whereby the detergent supply channel and the detergent discharge channel 40 is closed in a pressure-tight manner. The detergent pump "6 delivers from the detergent supply s he holds 43 detergents via the detergent dispenser line 42, the input connection 41 to the detergent supply channel 37 and 38, whereby by, the pending pressure of the detergent the membrane 26 from the detergent supply channel 37 and Detergent discharge channel 39 is lifted because the cylinder space 54- of the cylinder has meanwhile been lifted by the control valve 8 11 with the compressed air line 9 and via the compressed air line 20, the application chamber 24 is vented into the atmosphere is. The detergent is therefore via the detergent supply channel 37 »the detergent discharge channel 39 and via the outlet connection 47 as well as the detergent discharge line 49 of the detergent nozzle row 52 of the wiper blade 50. When the detergent emerges on the windshield 19, the piston, which has meanwhile been acted upon by compressed air, moves 12 of the cylinder 11 of the windshield washer system 5 to the right, with the windshield wiper arm 16 one of the piston movement opposite movement in the counterclockwise direction to the left. After reaching the setting, this controls

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Control valve 8 and vents the compressed air line 10, the cylinder chamber 53 and the compressed air line 21 the Acting chamber 25. At the same time, the control valve 8 controls compressed air via the compressed air line 9 on the one hand into the cylinder space 54 of the cylinder 11 and on the other hand over the compressed air line 20 into the application chamber 24- des Changeover valve 23, whereby the membrane 26 is acted upon is and the detergent supply channel 37 and the detergent discharge channel 39 closes pressure-tight again, while the Membrane 27 of the now vented loading chamber 25 is lifted by the pressure of the detergent from the detergent supply channel 38 and V / aschmitt el discharge channel 40 and thereby the detergent via the detergent supply channel 38 » the detergent discharge channel 40 and via the outlet connection 46 as well as the detergent discharge line 48 of the detergent nozzle row 51 of the wiper blade 50. If detergent leaks The piston 13 of the cylinder 11, which is now acted upon by compressed air, moves onto the windshield 19 Windshield wiper system 5 again in the opposite direction, wherein the wiper arm 16 is opposite to the piston movement Movement clockwise to the right until it reaches its original starting position and that Control valve 8 switches to a further, previously described wiping and washing movement of the windshield wiper arm 16.

In a further embodiment of a shuttle valve a windshield wiper and washer system according to the invention

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the reference numerals corresponding to FIG. 1 in FIG. 2 are provided with a prime.

According to FIG. 2, a shuttle valve is in a housing 22 ' 23 'each cylinder 61 and 62 arranged in series, in which one piston slide 26 'and 27' each guided on the same axis is, which as shut-off devices by means of a stop 63 and 64 each loaded by a compression spring 65 and 66 in their are held adjacent end position. A side 67 and 68 of the piston slide 26 'facing away from each other. and 27 'each delimit a loading chamber 24' and 25 ', which alternately from the drive pressure medium of the windshield wiper drive 5 'via a compressed air line 20' and 21 * the Cylinders 61 and 62 are acted upon. In the cylinders 61 and 62 opens into the career of the piston valve 26 'and 27' each a detergent discharge channel 39 'uttd 40' that can be shut off from these by looping. One side facing each other 69 and 70 of the piston valves 26 'and 27' each close one Detergent supply channel 37 'and 38', which from the pressure a detergent pump 6 'acts on the detergent via a detergent supply line 42', an input connection 41 ' alternately to one of the detergent discharge channels 39 'and .40 'promotes and via one output port 46' and 47 ', which are each connected to a detergent discharge line 48 'and 49' are and via one row of nozzles 51 'and 52' each arranged on a wiper blade 50 '. a 19 'windshield feeds.

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In the described position according to FIG. 2, the shuttle valve 2J 'is in the operational rest position.

The mode of operation of the shuttle valve 23 * according to FIG. 2 corresponds the previously described shuttle valve 23 of the wiper and washing system according to FIG. 1.

If, after actuation of the wiper system 5 ', the washing system of the shuttle valve 23' according to FIG. 2 is also switched on by the position B of the pressure switch 3 ', the detergent ^{conveyed by the detergent pump 6 1} moves via the detergent supply line 42' and the detergent supply channel 37 ' Piston slide 68 in the direction of the compressed air line 20 * until the detergent discharge channel 39 'is released. Via the detergent discharge line 49 ', the detergent now reaches the row of detergent nozzles 52' located at the front in the direction of movement of the wiper blade 50 'on the windshield 19'. The further function of the embodiment according to FIG.

The structural design of the shuttle valve 23 according to FIG. 1 or 23 'according to FIG. 2 is advantageously kept in such a way that when only the windshield washer system 5 or 5 ^{1 is} actuated, the detergent is discharged from the nozzles 51, 52 or 51 ', 52 ¹ shut off.

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Claims (4)

Claims Λ ») Windshield wiper and washer system with a windshield wiper drive operated by means of pressure medium and pump-fed detergent, the detergent can be supplied via a detergent supply line and two rows of detergent nozzles, which are each arranged on one side of the wiper blade, characterized in that a with an input connection (41) and two output connections (46,47) for the detergent 'provided, in the cycle of the wiping movements switching shuttle valve (23) "is arranged, the input connection (41) to the detergent pump (6) and the alternately with this connected output connections ( ^{46, 47) 8} ^ ¹ the washing agent nozzle rows (51 »52) of the wiper blade (50) arranged on each side of the wiper blade (50) are connected, the shuttle valve (23) being connected by means of directly or indirectly depending on the wiping movements of the shut-off devices, the detergent is only sent to the in Direction of movement of the wiper blade (50) at the front of the row of detergent nozzles (51 or 52). 2. Windshield wiper and washer system according to claim 1, characterized characterized in that the shut-off devices of the shuttle valve (23) are designed as two diaphragms (26, 27) which are parallel and spaced from one another with their radially outer diaphragms Edge (28) in the housing (22) of the shuttle valve (23) 509823 / 05A1 236025C are attached and that in support walls (29,30,31 and 32, 33,34) j the membrane surfaces (35, 36) are assigned, one each of which can be covered by the membranes (26, 27) for detergent supply (37i38) and detergent discharge ducts (39,4-0) opens, the two detergent supply channels (37 »38) jointly to the input connection (41) and the detergent discharge channels (39, 4-0) are separated from one another are connected to one output connection (46, 4-7) each, and that the membrane surfaces (44, 45) facing away from one another each delimit a loading chamber (24, 25) which alternately from the drive pressure medium of the Schexbenwxschantrxebes (5) can be acted upon. 3. Windshield wiper and washer system according to claim 1, characterized in that the shuttle valve (23 ') as a shut-off device has two coaxially arranged piston valves (25 ¹ , 26') which on the mutually facing sides (69,70) from via the input connection (41 ') and on the other hand alternately ^{acted upon by the drive pressure means of the Schexbenwxschantrxebes (5 1} ) and each of which only in its end position facing the other piston slide (26', 27 ') one with one of the output connections (46', 47 ') connected detergent discharge channel (395, . 40 ') by grinding. 4. windscreen wiper and washer system according to claim 2 or 3, characterized in that the shut-off devices of the Wechselven tils (23,23 ') in the reverse direction from a continuously effective ν «. ν _Ί +. * - _Λ 509823/0541 Force loaded sxnd. e e SS rs e it