Patent GB-798992-A (GB)
Title: Method of and apparatus for removing carbon from the inner wall surfaces of a cylinder of an internal combustion engine
IPC: F02B77/04
Filed: 1956-02-21
Abstract: 798,992. Abrasive blasting. KENT-MOORE ORGANIZATION, Inc. Feb. 21, 1956 [Sept. 15, 1955], No. 5313/56. Class 60. [Also in Group XXVIII] Apparatus for removing carbon from the inner wall surfaces of a cylinder of an internal combustion engine without first taking off the cylinder head comprises a wheeled stand 10 supporting a blasting unit 12 connected by blast and exhaust hoses 14, 16 with a nozzle assembly 18. ably secured by thumb screws 28 in a band 26 mounted between the upper ends of spaced frame members 20 of the stand 10 so as to pivot about a horizontal axis the frame members 20 carry an arcuate strut 24 which limits the swinging movement of the unit 12 in one direction. The blasting unit 12 comprises a casing 30 within the upper and lower ends of which are telescoped a blast granule storage receptacle 32 and a filter pad 34. A skirt 36 welded to the receptacle 32 is secured by screws 38 to the inner wall of the casing 30. The receptacle 32, which is airtight, has a filling cap 40 and at the bottom communicates through a port 54, controlled by a rotary valve 56, with a passageway 50 to one end of which compressed air is supplied through an adjustable air pressure regulator valve 78 ; flow of air through the passageway 50 is controlled by a rotary valve 66. The other end of the passageway 50 is connected by hose 14 to the nozzle 124 which is inserted through the sparking plug opening. The spent abrasive and loosened carbon pass by exhaust hose 16 into the interior of the filter pad 34 which comprises a casing 90 containing primary and secondary filter bags 106, 102. The passageway 50 is connected by line 70 to an air pressure gauge 72 mounted on a panel 128 on the outside of casing 30, the panel also carrying a timer 126 which gives audible warning of the expiry of a predetermined time interval. The stem 67 of the air control valve 66 is provided with a knob 68 co-operating with " OFF " " BLAST " and " CLEAN " markings on the panel 128; an arm 74 mounted on the valve stem 67 has a pin 76 adapted to be received within the slot of a bifurcated arm 60 mounted on the free end of the granule control valve 56. When the knob 68 is turned to " OFF " position, both valves 66 and 56 are closed. The timer 126 is started and the knob 68 turned to " BLAST " position, thus rotating the valve 66 clockwise to open position ; during clockwise movement of arm 74 the pin 76 rides up the slot in arm 60 so swinging the arm in a counterclockwise direction to open the granule control valve 56 slightly after the valve 66 opens. When the timer indicates the expiry of the preselected time interval, the knob 68 is turned to " CLEAN " position, thus moving the valve 66 counterclockwise through 180 degrees to a second open position ; as the arm 74 swings counterclockwise it closes the granule control valve 56 by the interaction of the pin 76 and the slot in the arm 60. After a suitable period, the knob 68 is moved to " OFF " position. When it is desired to replace the primary or secondary filters, the blast unit 12 is rotated about the horizontal axis until the storage receptacle 32 and filter pad 34 are disposed substantially horizontally. The blast granules may be crushed walnut shells. Specification 684,905 [Group XXII] is referred to.