Patent ID: 7140597

Claim:
A carpet stretching device comprising: a housing having a front end, a rear end, and a receiving space between said front and rear ends; a handgrip connected to said housing; a piston unit including a piston member disposed in said receiving space for moving relative to said housing, a piston rod extending out of said housing through said front end, and a biasing member provided between said rear end of said housing and said piston member; a carpet gripping head connected to said housing; a fluid supply unit connected to said housing and including at least a main supply passage provided in said handgrip, a main valve assembly provided in said handgrip to control said main supply passage, a main trigger connected to said main valve assembly, an auxiliary passage connected fluidly to said main supply passage and said receiving space, and a safety valve assembly for controlling said auxiliary passage, said safety valve assembly permitting said auxiliary passage to supply fluid to said housing from said main supply passage only when said safety valve assembly is activated; and an anchor member attached to a front end of said piston rod in front of said carpet gripping head.