JP2006218587A5 - - Google Patents

Claims (7)

A housing that defines a pressure accumulating chamber for storing compressed air;
A cylindrical cylinder provided in the housing;
A piston provided in the cylinder so as to be slidable back and forth from top dead center to bottom dead center;
A driver blade fixed integrally or separately to the bottom surface of the piston, extending from the bottom surface of the piston to the outside lower part of the cylinder at the bottom dead center of the piston, and striking a nail by the reciprocating motion of the piston;
An air passage from the piston upper chamber to the pressure accumulating chamber or the air passage to the atmosphere, which is provided so as to be vertically movable with respect to the upper peripheral edge of the cylinder and is partitioned by a wall portion including the upper surface of the piston, is alternatively selected. A head valve to be formed;
An exhaust valve rubber made of an elastic material attached to a part of the casing at an upper portion of the cylinder, wherein the lower surface of the exhaust valve rubber is disposed so as to face the upper surface of the piston, and the piston upper chamber The upper surface of the exhaust valve rubber defines an exhaust expansion chamber together with a part of the housing, and the outermost peripheral edge portion of the exhaust valve rubber contacts or does not contact the vertical movement of the head valve, In a nailing machine having an exhaust valve rubber that forms an air passage from the piston upper chamber to the atmosphere in cooperation with the head valve,
The lower surface of the exhaust valve rubber is to have a convex lower surface that forms a protrusion extending downward toward the upper surface of said piston,
The upper surface of the exhaust valve rubber forms a groove in the convex lower surface portion.
A nailing machine having a concave upper surface.   The convex lower surface portion of the exhaust valve rubber is positioned in the direction of the bottom dead center of the piston.
The nailing machine according to claim 1, wherein the nailing machine has a shape depending on a position below the outermost peripheral edge.   The convex bottom surface of the exhaust valve rubber is located at the top dead center of the piston.
The nailing machine according to claim 1 or 2, wherein the nailing machine contacts an upper surface of the piston.   The upper surface of the piston has a protruding upper surface portion, and the convex upper surface portion of the piston is
The bottom surface portion of the exhaust valve rubber other than the convex bottom surface portion at the top dead center of the stone
The nail driver according to any one of claims 1 to 3, wherein the nailer is in contact with the nail driver.   The exhaust valve rubber has a central part centered on the same central axis as the piston.
It has an umbrella-shaped cross-sectional shape extending to the outermost peripheral edge portion, and the convex lower surface portion has the central portion and the outermost portion.
It is formed in an intermediate part with a peripheral part, and the central part is attached to a part of the casing.
The nail driver according to any one of claims 1 to 4.   The upper surface of the piston has a convex upper surface protruding at the center thereof, and the convex upper surface of the piston
Is located at the center of the exhaust valve rubber at the top dead center of the piston.
The nailing machine according to claim 5, wherein the nailing machine is in contact with a lower surface portion to be placed.   The convex lower surface portion of the exhaust valve rubber has the piston at the top dead center.
The nailing machine according to claim 6, wherein the nailing machine is in contact with a peripheral upper surface portion of the nailing machine.