Piston-rod scraping ring accommodated in a groove in a dashpot cap, and method of inserting such a ring in such a groove

Abstract

A piston-rod scraping ring ( 7 ) of elastic material accommodated in an inward opening groove ( 9 ) in a dashpot cap ( 2 ) and especially intended to scrape water and dirt off a piston rod ( 1 ). The object is to allow the ring to be easily inserted into the groove and secured there until the overall dashpot is assembled. The groove is accordingly higher at its outer circumference and its inner circumference ( 12 ) is deformed, compressing the rim ( 8 ) in place.

1 . Piston-rod scraping ring ( 7 ) of elastic material accommodated in an inward opening groove ( 9 ) in a dashpot cap ( 2 ) and especially intended to scrape water and dirt off a piston rod ( 1 ), characterized in that the groove is higher in the vicinity of its outer circumference and the rim ( 8 ) around the ring is axially compressed in the vicinity of the inner circumference ( 12 ) of the groove.  
     
     
         2 . Method of inserting the piston-rod scraping ring ( 7 ) into the groove ( 9 ) in a dashpot cap ( 2 ) recited in  claim 1 , characterized in that the rim ( 8 ), which is intended to occupy the groove ( 9 ), has a height that is more or less uniform and is inserted into the groove, which has the same height ( 10 ) as the rim, subsequent to which at least the wall ( 11 ) of the groove at its inner circumference ( 12 ) is deformed, decreasing the height of the groove in that vicinity.  
     
     
         3 . Method of inserting the piston-rod scraping ring ( 7 ) into the groove ( 9 ) in a dashpot cap ( 2 ) recited in  claim 1 , characterized in that the rim ( 8 ), which is intended to occupy the groove ( 9 ), has a height [that is more or less non uniform] and is inserted into the groove, which has a height ( 10 ) that decreases as it approaches the center, subsequent to which at least the wall ( 11 ) of the groove at its inner circumference ( 12 ) is deformed, decreasing the height of the groove in that vicinity  
     
     
         4 . Method of inserting the piston-rod scraping ring ( 7 ) into the groove ( 9 ) in a dashpot cap ( 2 ) recited in  claim 1 , characterized in that the rim ( 8 ), which is intended to occupy the groove ( 9 ), has a height that decreases as it approaches the center and is inserted into the groove, which has a uniform height ( 10 ), subsequent to which at least the wall ( 11 ) of the groove at its inner circumference ( 12 ) is deformed, decreasing the height of the groove-as it approaches the center and in that the original maximal height of the rim ( 8 ) around the ring ( 7 ) approximately equals the original height of the groove.