HEADLAMP WIPER/WASHER SYSTEM

Abstract: A headlamp wiper/washer system for cleaning the sur­ face area of at least one headlamp of an automotive vehicle. The system includes a wiper mounted on the automotive vehicle for reciprocating motion to wipe the headlamp sur­ face area, a wiper driver for producing a plurality of suc­ cessive cycles of reciprocating motion of the wiper, a washer mounted on the automotive vehicle for squirting washer fluid onto the headlamp surface area, a washer driver associated with the wiper driver for driving the washer in synchronism with the reciprocating motion of the wiper. The washer driver includes a control device for driving the washer on a multi-­ cycle operation including a plurality of washer enabling cycles, at least one washer disabling cycle successive to one of the washer enabling cycles, and at least one additional washer disabling cycle successive to another one of the washer enabling cycles. The control device enables the washer to squirt washer fluid onto the headlamp surface area during the washer enabling cycles. The control device dis­ ables the washer to stop it from squirting washer fluid during the washer disabling cycles.

Description: HEADLAMP WIPER/WASHER SYSTEM BACKGROUND OF THE INVENTION This invention relates to a headlamp wiper/washer system for cleaning the transparent surface areas of headlamps of an automotive vehicle. In order to remove stains collected on the transparent surface areas of headlamps of an automotive vehicle, a headlamp wiper/washer system has been installed on automotive vehicle. The conventional headlamp wiper/washer system is arranged to drive the washer so as to squirt washer fluid onto the transparent surface areas of the headlamp during four cycles of swinging motion of the wiper and then stop the washer during the subsequent two cycles of swinging motion of the wiper to wipe the used washer fluid. Although such a conventional system is satisfactory for normal uses, its cleaning capacity is not so high as to remove heavy stains. In order to increase the cleaning capacity and reduce the washer fluid tank size, a need exists for an improved headlamp wiper/washer system which has a high capacity of cleaning automotive vehicle headlamps with less washer fluid. SUMMARY OF THE INVENTION Therefore, a main object of the invention is provide an improved headlamp wiper/washer system which has a higher capacity of cleaning automotive vehicle headlamps with less washer fluid. There is provided, in accordance with the invention, a headlamp wiper/washer system for cleaning the surface area of at least one headlamp of an automotive vehicle. The system includes a wiper mounted on the automotive vehicle for reciprocating motion to wipe the headlamp surface area, wiper drive means for producing a plurality of successive cycles of reciprocating motion of the wiper, a washer mounted on the automotive vehicle for squirting washer fluid onto the headlamp surface area, and a washer drive means associated with the wiper drive means for driving the washer in synchronism with the reciprocating the motion of the wiper. The washer drive means includes control means for driving the washer on a multi-cycle operation including a plurality of washer enabling cycles, at least one washer disabling cycle successive to one of the washer enabling cycles, and at least one additional washer disabling cycle successive to another one of the washer enabling cycles. The control means enables the washer to squirt washer fluid onto the headlamp surface area during the washer enabling cycles. The control means disables the washer to stop it from squirting washer fluid during the washer disabling cycles. BRIEF DESCRIPTION OF THE DRAWINGS This invention will be described in greater detail by reference to the following description taken in connection with the accompanying drawings, in which: Fig. 1 is a schematic plan view showing one embodiment of a headlamp wiper/washer system made in accordance with the invention; Fig. 2 is a schematic sectional view of the headlamp wiper/washer system; Fig. 3 is a plan view showing the relative relationship of parts in one cycle of operation of the headlamp wiper/washer system; Fig. 4 is a view similar to Fig. 3 showing the relative relationship of the parts in the first cycle of operation of the headlamp yiper/washer system; Fig. 5 is a view similar to Fig. 4 showing the relative relationship of the parts in the third cycle of operation of the headlamp wiper/washer system; ; Fig. 6 is a view similar to Fig. 5 showing the relative relationship of the parts in the fourth cycle or operation of the headlamp wiper/washer system; Fig. 7 is a view similar to Fig. 6 showing the relative relationship of the parts in the fifth cycles of operation of the headlamp wiper/washer system; Fig. 8 is a diagram showing the six cycle operation of the headlamp wiper/washer system; Fig. 9 is a diagram showing the five cycle operation of a modified form of the headlamp wiper/washer system; and Fig. 10 is a plan view showing a modified form of the contact plate used in the headlamp wiper/washer system. DETAILED DESCRIPTION OF THE INVENTION With reference to the drawings, where like numerals refer to like parts in the several views, and in particular to Fig. l, there is a schematic illustration of a headlamp wiper/washer system embodying the invention. The headlamp wiper/washer system, which is adapted to be carried within a casing (not shown) mounted on an automotive vehicle at an appropriate position adjacent the headlamps, includes a wiper motor 12. The wiper motor 12 has an output shaft 14 having a worm gear 16 secured thereon. The worm gear 16 is in mesh engagement with a drive gear 18 secured on a gear shaft 20 extending perpendicular to the wiper motor output shaft 14. The gear shaft 20 also has a small gear 22 secured thereon. The small gear 22 is in mesh engagement with a worm wheel 24 secured on a gear shaft 26 extending in parallel with the gear shaft 20. The worm wheel 24 has a pin which extends upward therefrom to provide a pivot pin 30 at which an operation rod 34 is pivoted for reciprocating movement in contact with a stationary guide pin 38 with rotation of the worm wheel 24 and it extends downward therefrom to provide an actuating pin 32, as best shown in Fig. 2. The operation rod 34 has a rack 36 held in mesh engagement with a pinion 40 having a pinion shaft 42 secured thereon. The pinion shaft 42 has wiper arms (not shown) secured thereon. Each of the wiper arms has a wiper blade secured thereon through a clamping clip (not shown) in such a manner that the wiper blade wipes the transparent surface of the corresponding headlamp with swinging motion of the wiper arm. A contact plate 44 is secured on a rotary shaft 46 extending in parallel with the gear shaft 26. The contact plate 44 is shown as formed in its periphery with six V-shaped cutouts 48 to provide six equally-spaced pawls 50. The contact plate 44 has three conductive pawls having a conductive film deposited thereon and connected to ground, and three non-conductive pawls having an insulating film deposited thereon. It is to be understood, of course, that the contact plate 44 may be made of a conductive material in which case an insulating film is deposited on each of the non- conductive pawls with the conductive pawls having no conductive film deposited thereon. Alternatively, the contact plate 44 may be made of an insulating material in which case a conductive film is deposited on each of the conductive pawls with the non-conductive pawls having no insulating film deposited thereon. The reference numeral 52 designates an electrical wire which terminates in an exposed contact 54 urged in a resilient manner into contact with one of the contact pawls 50. The electrical wire 52 is connected to a power source through a washer fluid squirting unit (not shown). This unit operates to squirt a washer fluid onto a plurality of headlamps of an automotive vehicle to clean the same when actuated. The fluid is directed from a washer pump by a main conduit and then branch conduits to nozzles located adjacent the headlamps to be cleaned. As best shown in Fig. 3, the contact plate 44 is placed in such a manner that the actuating pin 32 can -be positioned in one of the cutouts 48 at the start of one operation cycle during which the actuating pin 3D pushes one contact pawl 50 to rotate the contact plate 44 at 60 degrees in a direction indicated by the arrow and then departs from the contact plate 44 with a full rotation of the worm wheel 24. The contact plate 44 is shown as having first, second, third, fourth, fifth and sixth contact pawls 50a, 50b, 50c, 50d, 50e and 50f arranged successively in this order. The contact pawls 50b, 50d and 50e, indicated by the hatched areas, are conductive pawls, and the contact pawls 50a, 50c and 50e are non-conductive or insulating pawls. The contact plate 44, which makes a full rotation with six rotations of the worm wheel 24, works the washer fluid squirting unit on a six cycle operation which changes from one cycle to another each time the worm wheel 24 makes a full rotation. The washer fluid squirting unit is powered to squirt washer fluid onto the headlamps only when the electrical wire exposed contact 54 is in contact with either of the conductive pawls 50b, 50d and 50e. The operation of the headlamp wiper/washer system will be described with reference to Figs. 4 to 8. It is first assumed that the actuating pin 30 is positioned in the cutout provided between the contact pawls 50a and 50b. When, at time t01 a driver actuates a headlamp wiper switch (not shown) installed on an instrument panel, the wiper motor 12 starts operating to rotate the worm gear 16. This rotation is transmitted through the gears 18 and 22 to rotate the worm wheel 24 in the indicated direction, causing the operation rod 34 pivoted on the worm wheel 24 to reciprocate so as to swing the wiper arms secured on the gear shaft 42. Such rotation also causes the actuating pin 32 to push the contact pawl 50b so as to rotate the contact plate 44 in the indicated direction. As a result, the conductive pawl SOf comes into contact with the electrical wire exposed contact 54 to start the washer fluid squirting unit squirting a washer fluid onto the headlamps. The washer fluid squirting unit continues to squirt the washer fluid onto the headlamps as long as the electrical wire exposed contact 54 is in contact with the conductive pawl 5Qf, as shown in Fig. 4. After the actuating pin 32 pushes to rotate the contact plate 44 through 60 degrees, it separates from the contact pawl 50b and the contact plate 44 stops it from rotating at the position where the electrical wire exposed contact 54 remains in contact with the conductive pawl 50e. This condition continues until the actuating pin 32 comes into abutment against the next contact pawl 50a at time tl. Therefore, this first cycle continues for a time interval from time tO to time tl during which the worm wheel 24 makes a full rotation, causing the wiper arms to swing one cycle and the washer fluid squirting unit to squirt the washer fluid onto the headlamp. As a result, the wiper blades wipe the transparent surfaces of the respective headlamps to clean the same with a washer fluid squirted thereon, as shown in Fig. 8. At time tl, the actuating pin 30 comes into abutment with the next contact pawl 50a and starts rotating the contact plate 44 again. In the second cycle, the electrical wire exposed contact is in contact with the conductive pawl 50d so that the washer fluid squirting unit operates to squirt the washer fluid onto the headlamps. As a result, the wiper blades wipe the respective headlamps to clean the stains with the washer fluid squirted thereon during the second cycle which continues for a time interval from time tl to time t2, as shown in Fig. 8. At time t2, the actuating pin 30 comes into abutment with the next contact pawl 50f and starts rotating the contact plate 44 again. In the third cycle, the electrical wire exposed contact is in contact with the insulating pawl 5Qc, as shown in Fig. 5, so that the washer fluid squirting unit stops squirting the washer fluid. As a result, the wiper blades wipe the transparent surfaces of the respective headlamps to remove the used washer fluid from the headlamps during the third cycle which continues for a time interval from time t2 to time t3, as shown in Fig. 8. At time t3, the actuating pin 30 comes into abutment with the next contact pawl 50e and starts rotating the contact plate 44 again. In the fourth cycle, the- electrical wire exposed contact 54 is in contact with the conductive pawl 50b, as shown in Fig. 6, so that the washer fluid squirting unit operates to squirt the washer fluid onto the headlamps. As a result, the wiper blades wipe the transparent surfaces of the respective headlamps to clean the residual stains therefrom with the washer fluid squirted thereon during the fourth cycle which continues for a time interval from time t3 to t4, as shown in Fig. 8. At time t4, the actuating pin 30 comes into abutment with the next contact pawl 50d and starts rotating the contact plate 44 again. In the fifth cycle, the electrical wire exposed contact 54 is in contact with the insulating pawl 50a, as shown in Fig. 7, so that the washer fluid squirting unit stops squirting the washer fluid. As a result, the wiper blades wipe the transparent surfaces of the respective headlamps to remove the used washer fluid during the fifth cycle which continues for an time interval from time t4 to time t5, as shown in Fig. 8. At time t5-, the actuating pin 30 comes into abutment with the next contact pawl 50c and starts rotating the contact plate 44 again. In the sixth cycle, the electrical wire exposed contact 54 is in contact with the insulating pawl 50f so that the washer fluid squirting unit stops squirting the washer fluid. As a result, the wiper blades wipe the transparent surfaces of the respective headlamps to remove the residual washer fluid during the sixth cycle which continues for a time interval from time t5 to time t6 at which the actuating pin 30 comes into abutment with the first contact pawl SOb. This six cycle operation may be repeated, if necessary, until the driver releases the headlamp wiper switch. Although the contact plate 44 has been described as having conductive pawls 50b, 50d and 50e, it will be appreciate that the invention is not limited in any way to such a contact plate arrangement as long as at least one insulating pawl is successive to one of the conductive pawls and at least one additional insulating pawl is successive to another one of the conductive pawls. For example, the contact pawls 50a, 50b and 50e may be conductive pawls with the other contact pawls being insulating pawls. In addition, although the contact plate 44 has been described as having six contact pawls to work the washer fluid squirting unit on a six cycle operation, the invention is limited in no way to such an arrangement. For example, the contact plate 44 may have five contact pawls to work the washer fluid squirting unit on a five cycle operation, as shown in Fig. 9. Fig. 10 shows a modified form of the contact plate which is substantially the same as the contact plate of Fig. 3 except that each of the conductive pawls 60b, 60d and 60e has a conductive film deposited on the circumferential surface thereof. In this modification, a contact 23 is provided for sliding movement on the circumferential surface of the contact plate. It is, therefore, apparent from the foregoing that the inventive headlamp wiper/washer system consumes far less washer fluid and requires a smaller-sized washer fluid tank than does the conventional system.

Claims: WHAT IS CLAIMED IS: 1. A headlamp wiperlwasher system for cleaning the surface area of at least one headlamp of an automotive vehicle, including a wiper mounted on said automotive vehicle for reciprocating motion to wipe the headlamp surface area, wiper drive means for producing a plurality of successive cycles of reciprocating motion of said wiper, a washer mounted on said automotive vehicle for squirting washer fluid onto the headlamp surface area, a washer drive means associated with said wiper drive means for driving said washer in synchronism with the reciprocating motion of said wiper, characterized in that said washer drive means includes control means for driving said washer on a multi-cycle operation including a plurality of washer enabling cycles, at least one washer disabling cycle successive to one of said washer enabling cycles, and at least one additional washer disabling cycle successive to another one of said washer enabling cycles, said control means enabling said washer to squirt washer fluid onto the headlamp surface area during said washer enabling cycles, said control means disabling said washer to stop squirting washer fluid during said washer disabling cycles. 2. The headlamp wiper/washer system as claimed in claim l, wherein said control means drives said washer on a six cycle operation including first, second, third, fourth, fifth and sixth cycles which occur successively in this order, said control means enabling said washer during said first, second and fourth cycles, said control means disabling said washer during said third, fourth and sixth cycles. 3. The headlamp wiper/washer system as claimed in claim 1, wherein said control means drives said washer on a six cycle operation including first, second, third, fourth, fifth and sixth cycles which occur successively in this order, said control means enabling said washer during said first, second and fifth cycles, said control means disabling said washer during said third, fourth and sixth cycles. 4. The headlamp wiper/washer system as claimed in claim 1, wherein said control means drives said washer on a five cycle operation including first, second, third, fourth and fifth cycles which occur successively in this order, said control means enabling said washer during said first, second and fourth cycles, said control means disabling said washer during said third and fifth cycles. 5. The headlamp wiper/washer system as claimed in claim l, wherein said control means includes a contact plate mounted for rotation, said contact plate having a plurality of conductive pawls, at least one insulating pawl successive to one of said conductive pawls, and at least one additional insulating pawl successive to another one of said conductive pawls, means for rotating said contact plate in synchronism with the reciprocating motion of said wiper, and contact means positioned with respect to said contact plate for successive contact with said pawls to enable said washer only when said contact means is in contact with said conductive pawls. 6. The headlamp wiper/washer system as claimed in claim l, wherein said control means including a contact plate mounted for rotation, said contact plate having first, second, third, fourth, fifth and sixth contact pawls arranged successively in this order, means for rotating said contact plate in synchronism with the reciprocating motion of said wiper, and contact means positioned with respect to said contact plate for successive contact with said contact pawls to enable said washer only when said contact means is in contact with said first, second and fourth pawls. 7. The headlamp wiper/washer system as claimed in claim 1, wherein said control means including a contact plate mounted for rotation, said contact plate having first, second, third, fourth, fifth and sixth contact pawls arranged successively in this order, means for rotating said contact plate in synchronism with the reciprocating motion of said wiper, and contact means positioned with respect to said contact plate for successive contact with said contact pawls to enable said washer only when said contact means is in contact with said first, second and fifth contact pawls. 8. The headlamp wiper/washer system as claimed in claim l, wherein said control means including a contact plate mounted for rotation, said contact plate having first, second, third, fourth and fifth contact pawls arranged successively in this order, means for rotating said contact plate in synchronism with the reciprocating motion of said wiper, and contact means positioned with respect to said contact plate for successive contact with said contact pawls to enable said washer only when said contact means is in contact with said first, second and fourth contact pawls.

Inventors: AOYAMA, MASUTOSHI, ONO, EIICHI
Applicants: NISSAN MOTOR CO., LTD.
Application year: 1987
Main classification: B60S1
IPC codes: B60S1