초록 ▼

An electronic thermostat tester monitors the heat rise of the coolant in the radiator of an internal combustion engine as a function of time and provides “defect”signals if the heat does not reach a preselected level (160°F.) in a predetermined time period (eight minutes). The electronic thermostat

An electronic thermostat tester monitors the heat rise of the coolant in the radiator of an internal combustion engine as a function of time and provides “defect”signals if the heat does not reach a preselected level (160°F.) in a predetermined time period (eight minutes). The electronic thermostat tester can also be used with bulldozers, buses, tractors and other heavy-duty equipment. When use with heavy-duty engines, the time intervals will be longer. If the preselected heat range is reached within the time period a light indicates that the thermostat is functioning properly. The tester further includes a plurality of indicating lights for thermostat levels (180°F. and 190°F.) above the preselected heat level (160°F.) for engines having different ratings. By using this thermostat tester one does not have to remove the thermostat from an engine to test the thermostat. In addition, the tester may be used to detect clogged engine blocks, radiators and defective automatic fans.

대표청구항 ▼

An apparatus for testing the condition of liquid cooling systems of internal combustion engines, wherein a thermostat is disposed in coolant of a cooling system between a radiator and an engine, the device comprising: a heat sensor for placement in the coolant between the radiator and thermostat; ti

An apparatus for testing the condition of liquid cooling systems of internal combustion engines, wherein a thermostat is disposed in coolant of a cooling system between a radiator and an engine, the device comprising: a heat sensor for placement in the coolant between the radiator and thermostat; time counting means for counting a preselected time interval selected to correspond to the time interval in which the coolant should reach a first preselected heat level; means connected to the time counting means for starting operation thereof upon commencing testing of the cooling system; an under-range switch means connected to the heat sensor for detecting when the cooling system reaches the first preselected temperature; a first indicating means for indicating that the coolant has reached the first preselected heat level; relay means connected to the under-range switch, the time counting means and the first indicating means for interrupting operation of the first indicating means if the time counting means signals an end to the time interval before the under-range switch detects that the sensor has reached the preselected heat level; second indicating means for providing a defect signal when the time counting means signals the end of the first preselected time interval; first connecting means for connecting the second indicating means to the time first connecting means, said counting means including second relay means connected between the second indicating means and time counting means and being connected to the under-range switch for interrupting transmission of the time interval signal to the second indicating means to prevent issuance of a defect signal; outer-range switch means connected to the heat sensor for detecting when the coolant reaches at least one upper heat level limit higher than the first preselected temperature; at least one additional indicating means for indicating that the upper temperature limit has been reached, second connecting means for connecting the outer range switch means to the additional indicating means; said second connecting means including third relay means connected between the additional indicating means and outer-range switch means for interrupting operation of the addition indicating means if the outer-range switch means does not detect that the coolant has reached the upper heat level limit, whereby the first, second and third relay means enable the associated indicating means to indicate a condition of the cooling system if that condition is indicative of the true state of the cooling system and interrupt an associated indicating means if the condition indicated by the indicating means is not indicative of the true state of the cooling system.