Patent ID: 8925452
Filing Date: 2015-01-06
Classification: B30B

Abstract:
1. A hand-held machine pressing apparatus for pressing workpieces supported on a supporting surface, comprising: a pressing assembly, comprising: a controlling valve which connecting to a pressure source, for controlling the gas pressure in the piston chamber; wherein the pressing head aims at the workpiece, the controlling valve controlling the piston chamber to pressurize the pressure cylinder assembly using pressurized gas from the pressure source, to drive the piston, the push rod and the tool to act on the workpiece; and wherein the controlling valve comprises a first flow path, a second flow path, and a switch, the switch controls the controlling valve to open the first flow path to supply the gas pressure to the piston chamber, or to open the second flow path to relieve the gas pressure in the piston chamber; and wherein when the controlling valve opens the first flow path, the piston cylinder is pressurized to drive the tool to act on the workpiece; when the controlling valve opens the second flow path, the tool moves away from the workpiece, the controlling valve further includes a gas path control valve, the controlling valve connects to the pressure source via the gas path control valve, which includes a first gas inlet, a first gas outlet, a first sealed port, a second gas inlet, a second gas outlet, and a second sealed port, both the first sealed port and the second sealed port keep sealed, when the controlling valve opens the second flow path, the second gas inlet is connected to the piston chamber, the second gas outlet is open, and the pressure source is connected to the second sealed port, the gas in the piston chamber is escaped through the second gas inlet and the second gas outlet.