Patent GB-769633-A (GB)
Title: Improvements in windshield washers for vehicles
IPC: B60S1/48
Filed: 1955-04-20
Abstract: 769,633. Windscreen cleaning systems. TRICO PRODUCTS CORPORATION. April 20, 1955 [April 20, 1954], No. 11431/55. Class 138(1) _[Also in Group XXVIII] A windshield washer comprises a foot operated pump, including a bellows 22, Fig. 5, having a discharge, stroke and an intake stroke, means for automatically setting, a windshield wiper in operation on the discharge stroke and arresting the wiper at the end of the intake stroke and means for retarding the initial portion of the intake stroke comprising a valve 30 which opens during the discharge stroke and closes during the intake stroke and a bleed passage 24<SP>1</SP> by-passing the valve 30. Referring to Fig. 1 the windshield cleaning system comprises, a wiper arm 3 and blade 2 oscillated by a suction motor 5, in known manner, a washer nozzle 10 connected by a pipe 12 to a liquid reservoir 13, and the pump bellows 22 connected by a pipe 15 to the reservoir 13. The pump bellows 22 is elastic having a distensible side wall and is generally the same as that disclosed in Specification 734,659, which is referred to. The control valve 6 of the motor 5 is connected by a cable 21 to a rocker arm 20 operable by a pedal 19 for actuating the pump 22. Independent operation of the motor valve 6 can be effected by a cable 7 and a hand knob 8. A second nozzle 10 (not shown) may be supplied with liquid through the agency of a T-branch 18 in the pipe 12. The pedal 19, Fig. 2, is pivotally mounted by a pin 46 on a bracket member 47, which serves to anchor the bellows 22 and also an adjacent and similar but valveless bellows 14, and is urged to its inoperative position by a spring 48. A lug 43 rigid with the pedal engages the bellows 14 and an abutment 45 overhanging from the lug 43 engages a lug 44 pivoted on the pin 46 and integral with the rocker arm 20, the pivoted lug 44 engaging the bellows 22. The bellows 22 communicates through a nipple, a tube 41 and T-connection 42 with the pipe 15, the bellows 14 serving to increase the capacity of the pump 22. Referring to Fig. 5, the bulb 22 device is anchored on the bracket 47 by a flange 36 of a sleeve 25. Between the pressure pad 26 of the bulb 22 and an internal. shoulder 24 in the sleeve 25 is a. bulb expansion spring 23, a wear plate 27 being interposed between the pad 26,arid, the end of the spring 23. The shoulder 24 serves as a seat for an annular outlet valve 30 urged to its closed 'position by a spring 31, bleed passages 24<SP>1</SP> being provided in the shoulder 24. Passing through the central opening 30<SP>1</SP> of the valve 30 is a stem 32 carrying an inlet valve 33 and a link 34, having a slidable connection with the wear plate 27 and provided within the wear plate with an enlarged head 35. A compression spring 38 acts between the valve 30 and a disc 37 on the end of the stem 32. When the pedal 19 is depressed the bulbs 14, 22 are compressed simultaneously. The. outlet valve 30 opens against its spring 31 and liquid is passed from the bulb 22 to the nipple and thus to the nozzle or nozzles 10. The stem 32 follows the movement of the pressure pad 26 under the action of the spring 38 until the valve 33 seats on the opening 30<SP>1</SP>, whereafter the, wear plate 27 slides relative to the link 34 until it abuts the flange 36. When. the pedal 19 is releasedthe valveless bulb 14 expands unhindered to recharge with liquid but the initial intake stroke of the pump bulb 22 is retarded since the valve 30 is reseated and the opening 30' is closed and liquid can only enter the bulb through the bleed passages 24<SP>1</SP>. When the bulb 22 has expanded slowly to a position in which the plate 27 re-engages the head 35, the spring 23 overcomes the spring 38 and the inlet valve 33 is opened. The pivoted lug 44 and rocker arm 20 are operable by the pad 26 in its outward movement and thus the operation of the cable 21 and motor valve 6 are also retarded until the inlet valve 33 is opened, and the wiper operates for a predetermined time after the cessation, of the washing operation. If desired the pedal may be redepressed before the inlet valve 33 is. opened to supply liquid from the bulb 14 to the nozzles. If desired the bellows 14 may be dispensed with 'in which case the rocker arm 20 will be fixed to the pedal 19 and the spring 48 omitted. Specification 736,380 also is referred to.