| 摘要 |
Car washing apparatus including a primary arm pivotally supported at one end and extending rearwardly along the path of the car, a secondary arm pivotally supported on the free end of the primary arm and extending across the path of the car, and a rotary brush on the free end of the secondary arm. A secondary cylinder is connected between the primary and secondary arms, and the rod and blind ends of the cylinder are connected through flow controls to the control inlets of a 4-way valve. The 4-way valve controls a primary arm cylinder which retracts and extends the primary arm as required. When a car strikes the brush, the pressure increase at one end of the secondary arm cylinder pilots the 4-way valve, operating the primary arm piston and cylinder. When the brush passes the front corner of the car and the secondary arm begins to unfold under the influence of a bias spring, the pressure increase at the other end of the secondary arm cylinder pilots the 4-way valve oppositely, reversing the primary arm movement. The blind end flow control is provided with sufficient pressure relief to prevent, at low car speeds, false piloting thereof, but is restrictive enough to pilot the 4-way valve at car speeds above 10 feet per minute.
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