Portable equipment check units

Claim 1

APPARATUS FOR TESTING AND CHECKING THE CONDITION AND OPERABILITY OF THE SERVICE AND EMERGENCY AIR LINES OF TRAILERS OF THE TYPE WHICH IN USE ARE NORMALLY TOWED BY SEPARATE TRACTOR ELEMENTS AND AT WHICH TIME THE SERVICE BRAKES ARE ACTUATED BY AIR PRESSURE FROM THE TRACTOR AND THE EMERGENCY BRAKES ARE RELEASED BY AIR FROM THE TRACTOR, AND WHICH EMERGENCY BRAKES ARE MOVED TO BRAKING POSITION BY AIR PRESSURE FROM A TRAILER CARRIED SOURCE OF AIR WHEN THE TRACTOR AND TRAILER ARE DISCONNECTED FROM EACH OTHER; SAID TESTING AND CHECKING APPARATUS COMPRISING A PORTABLE TRUCKLIKE BODY ADAPTED TO BE BROUGHT INTO TESTING RELATION TO A TRAILER, IN THE ABSENCE OF ITS TOWING TRACTOR, SAID PORTABLE BODY CARRYING A PRESSURE AIR TANK, AN EMERGENCY AIR LINE INCLUDING AN AIR HOSE, CONNECTED TO SAID AIR TANK, A SHUT OFF VALVE BETWEEN THE TANK AND EMERGENCY AIR HOSE, AN AIR PRESSURE GAUGE CONNECTED TO THE EMERGENCY AIR LINE AT A POINT TO HAVE THE AIR PRESSURE WHICH IS DELIVERED TO THE EMERGENCY AIR LINE INDICATED UPON SAID GAUGE, A MANUALLY OPERABLE TWO-WAY VALVE COMPRISING A CASING AND MANUALLY OPERABLE VALVE ELEMENT THEREIN, SAID CASING ALSO HAVING A VENT LEADING THEREFROM, A SERVICE BRAKE AIR LINE HAVING A FIRST BRANCH LEADING FROM THE AIR TANK TO THE VALVE CASING AND HAVING A SHUT OFF VALVE THEREIN, A SERVICE LINE AIR HOSE AND A SECOND BRANCH LINE LEADING FROM THE CASING OF THE TWO-WAY VALVE TO THE SERVICE LINE AIR HOSE, BOTH OF SAID HOSES CARRYING AT THEIR FREE ENDS AIR HOSE CONNECTIONS OF A NATURE TO MAKE AIR TIGHT CONNECTION WITH THE CONVENTIONAL SERVICE AND EMERGENCY AIR LINE CONNECTIONS OF THE TRAILER UNDER TEST, SAID TWO-WAY VALVE WHEN IN ONE POSITION ESTABLISHING COMMUNICATION BETWEEN THE SAID TWO BRANCHES AND SHUTTING OFF THE VENT AND WHEN IN ANOTHER POSITION SHUTTING OFF COMMUNICATION BETWEEN THE LAST NAMED BRANCH AND THE VENT, AN ELECTRIC BATTERY UPON THE TRUCK, A PLURALITY OF ELECTRICAL CIRCUITS CONNECTED TO SAID BATTERY, A MULTIPLE CIRCUIT ELECTRIC CABLE HAVING MEANS FOR CONNECTING ITS CIRCUITS TO THE ELECTRICAL CIRCUITS OF THE TRAILER AT THE CONVENTIONAL PLUG-IN CONNECTION OF SAID TRAILER AND HAVING ITS CIRCUITS CONNECTED TO THE ELECTRICAL CIRCUITS FROM SAID BATTERY, SAID LATTER CIRCUITS INCLUDING TEST LAMPS, CIRCUIT BREAKERS AND INDIVIDUAL CONTROLLING SWITCHES AND A PANEL UPON THE TRUCK UPON WHICH THE TEST LAMPS, AND SWITCHES ARE MOUNTED AND AT WHICH SAID TEST LAMPS ARE VISIBLE.