|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||91/392 ; 91/402 ; 91/417A ; 92/85R|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 13 인용 특허 : 0|
A warning system for pneumatic fastener driving tools that acceptable bumper deterioration has been exceeded thereby to warn against further use of a tool prior to replacement of the bumper. A piston carrying a driver blade moves from an upper position of rest to lower fastener driven positions. The piston sealingly engages the cylinder wall via a sealing ring. As the bumper deteriorates, the piston moves to lower and lower fastener driven positions. When the piston reaches a predetermined lower position, the effectiveness of the sealing ring is impaired...
In a driving tool having a cylinder and a piston in said cylinder movable relative to said cylinder between an upper rest position and lower positions therein and wherein said piston carries at least one sealing ring sealingly engaging said cylinder, and a shock absorbing bumper against which said piston moves to progressively lower positions as said bumper deteriorates, means for impairing the effectiveness of said sealing ring when allowable bumper deterioration has been exceeded by engaging and dislodging said sealing ring when said piston reaches a p...