Abstract: A forward/reverse rotation device of a pneumatic tool comprising a clutch switch that can be pressed towards the inside of a switching valve to separate a steering switch from its connection with a positioning element, and the steering switch is turned from a side of a handle of the pneumatic tool to the other opposite side, and the clutch switch is bounced to resume its original position by the support of an elastic element, so as to connect the steering switch with the positioning element again. A sleeve portion of the steering switch is coaxially and pivotally installed at a center rod of the clutch switch, and the steering switch is turned between both sides of the handle and maintained to be pivotally turned on the center rod.

Abstract: An impact wrench with an improved redirection switch includes a housing, a motor shell, an on/off bar set, and a redirection switch. The pushing bar of the redirection switch and the redirection valve are connected in tandem along the same horizontal line. The rotational axis of the rotating redirection valve is perpendicular to the penetrating axis of the on/off bar set, instead of the same penetrating axis line. Therefore, the invention achieves the redirection effect without increasing the volume of its handle.

Abstract: A rotation speed control device for air tools and the method thereof are disclosed. A shell base is disposed with a forward air inlet and a reverse air inlet. A back cover is connected to one side of the shell base. The back cover has a forward flow path in communications with the forward air inlet and a reverse flow path in communications with the reverse air inlet. The forward flow path has a rotation space whose one side has a pressure release hole in communications with the ambient space. A rotation speed control element having a stopping part that can close the pressure release hole is disposed in the rotation speed. The rotation speed control element rotates to control the aperture size of the pressure release hole, thereby adjusting the airflow entering the forward flow path.

Abstract: An improved structure of a pneumatic impact wrench includes a main body, a plastic casing provided for fixing a motor casing and a motor module, the motor module having a cylinder for installing a rotor, the rotor being extended from an axle and supported by a bearing, the motor casing having an external case with a hardness greater than that of the plastic casing, and the external case being hollow and penetrating both ends to form a chamber for accommodating and installing a cylinder, and the external case having a stop ring protruded from an internal wall of the chamber and provided for blocking the cylinder, and an external case cover installed at a rear end of the external case for coupling and covering the external case cover.

Abstract: An air tool handle includes a first bushing and a second bushing prepared by different molds as two independent objects. The first bushing and the second bushing have a first hollow part and a second hollow part, respectively, that are in communication. The first bushing has several through parts and concave areas. The second bushing has several thin parts complementary to the concave areas and several thick parts connected with the thin parts and filling the through parts outward. The first bushing and the second bushing are combined along the same axial line. The first hollow part and the second hollow part accommodate the first body of an air tool or hand tool.

Abstract: A pneumatic tool with an improved soundproof device includes a housing whose rear end has a screw hole for supplying a high-pressure gas. The input high-pressure gas drives a pneumatic motor before it leaves the rear end of the housing. A cover covers the rear end of the housing. The cover has a penetrating hole. A guiding element has a guiding section that gradually expands outwards. The guiding element goes through the penetrating hole. An annular ventilation space is formed between the guiding section of the guiding element and the penetrating hole. A gas inlet connector is disposed in the screw hole. The shoulder part of the gas inlet connector stops the guiding element, so that the gas in the ventilation space is guided by the guiding section of the guiding element to escape.

Abstract: In a pneumatic grinder with an improved air intake control apparatus, a press board is designed on the bottom of a handle of the grinder and disposed at a position proximate to a grinding head, and a force applying end of the press board is turned by fingers by means of a first lever-and-fulcrum pivoting method, so that a pulling end of the press board pulls a pull rod of the air intake control apparatus to move downward and allows air to circulate. The operation by fingers is easier than the operation by pressing a palm onto the top of a handle at the press board. A second lever design allows a speed adjusting knob of the air intake control apparatus to be situated at a position nearer to the grinding head.

Abstract: An improved grinding disc structure includes a support disc having first through holes and second through holes; a main disc body, with a distal surface connected onto the support disc, and having dust exhaust holes, a longitudinal guiding portion at the center, and a longitudinal guiding portion with outwardly extended transverse guiding portions and each dust exhaust hole corresponding to each first through hole, and each transverse guiding portion corresponding to each second through hole, and each transverse guiding portion being not interconnected with each dust exhaust hole; a grinding layer, disposed on another distal surface of the main disc body, and having through holes corresponding to each dust exhaust hole and the longitudinal guiding portion, such that each dust exhaust hole and the longitudinal guiding portion achieve the dust collection effect for the external portion and center of the grinding disc.

Abstract: A pneumatic tool with an improved soundproof device includes a housing whose rear end has a screw hole for supplying a high-pressure gas. The input high-pressure gas drives a pneumatic motor before it leaves the rear end of the housing. A cover covers the rear end of the housing. The cover has a penetrating hole. A guiding element has a guiding section that gradually expands outwards. The guiding element goes through the penetrating hole. An annular ventilation space is formed between the guiding section of the guiding element and the penetrating hole. A gas inlet connector is disposed in the screw hole. The shoulder part of the gas inlet connector stops the guiding element, so that the gas in the ventilation space is guided by the guiding section of the guiding element to escape.

Abstract: A pneumatic saw power transmission structure includes a main body, a first transmission module and a second transmission module installed adjacent with each other in a containing groove of the main body. The second transmission module includes a position limit device fixed at the main body for limiting the second transmission module in the containing groove of the main body to constitute the transmission structure of the present invention.

Abstract: In a pneumatic grinder with an improved air intake control apparatus, a press board is designed on the bottom of a handle of the grinder and disposed at a position proximate to a grinding head, and a force applying end of the press board is turned by fingers by means of a first lever-and-fulcrum pivoting method, so that a pulling end of the press board pulls a pull rod of the air intake control apparatus to move downward and allows air to circulate. The operation by fingers is easier than the operation by pressing a palm onto the top of a handle at the press board. A second lever design allows a speed adjusting knob of the air intake control apparatus to be situated at a position nearer to the grinding head.

Abstract: A pressure display device includes a body having an adjustment valve and a display unit connected thereto. The pressurized air enters into the body via paths and the display unit. The pressure detection member detects the pressure and displays the value of the pressure in the display screen. The display screen can be adjusted its position relative to the body by rotating the rotary part such that the user can check value easily.

Abstract: A grinding machine with a length-adjustable dust collecting structure includes a dust collecting structure, and the dust collecting structure includes a dust collecting pipe and a moving element, and the moving element is installed at a front end of the dust collecting pipe for collecting dusts produced after a grinding process, and the moving element can be pushed or retracted from the front end of the dust collecting pipe, such that the displacement of the moving element at the front end of the dust collecting pipe allows the dust collecting pipe to effectively suck the dusts produced during the grinding process.

Abstract: A grinding machine with a length-adjustable dust collecting structure includes a dust collecting structure, and the dust collecting structure includes a dust collecting pipe and a moving element, and the moving element is installed at a front end of the dust collecting pipe for collecting dusts produced after a grinding process, and the moving element can be pushed or retracted from the front end of the dust collecting pipe, such that the displacement of the moving element at the front end of the dust collecting pipe allows the dust collecting pipe to effectively suck the dusts produced during the grinding process.

Abstract: A pneumatic grinder with improved handle structure comprising a driving portion, a connecting portion, and a grinding portion wherein the connecting portion has a handle fixing portion at one side thereof that has an accommodating space to receive a pivot element wherein the handle fixing portion has a slot on the top thereof, and further, a handle is fixed with the pivot element by screwing so that the handle can be pivoted along the slot and the grip angle thereof can therefore be adjusted.

Abstract: A grinding wheel includes a grinder engaged between a front cover and a rear cover, and rough portions of the front cover and the rear cover press against the grinder tightly. After center rods and fixed rods of the front cover and the rear cover are passed through center holes and fixing holes of the grinder, a bolt is passed through the fixing hole and secured with the nut to form a grinding wheel.

Abstract: An air tool with two exhaust pipes has a case that holds an air inlet, an air motor, an inlet switch for controlling the operation of the air motor, and an action element driven by the air motor. Both sides of the air tool are provided with an exhaust pipe connecting to the air motor. During the operation of the air tool, the exhaust is expelled via the two exhaust pipes simultaneously.

Abstract: A pneumatic grinder with improved handle structure comprising a driving portion, a connecting portion, and a grinding portion wherein the connecting portion has a handle fixing portion at one side thereof that has an accommodating space to receive a pivot element wherein the handle fixing portion has a slot on the top thereof, and further, a handle is fixed with the pivot element by screwing so that the handle can be pivoted along the slot and the grip angle thereof can therefore be adjusted.

Abstract: A pneumatic tool including a cylindrical main body in which a speed-adjusting section is disposed and a hollow barrel-shaped plastic sleeve fitted around the main body. The speed-adjusting section has an end section which is radially connected with an inner annular wall. Two opposite pin seats are disposed on one side of the plastic sleeve. Each pin seat has a pinhole. A pin member is fitted through two lugs of a press lever and the pinholes of the pin seats to pivotally connect the press lever with the plastic sleeve. After the plastic sleeve is fitted around the main body, an annular receiving space is defined between an outer circumference of the annular wall of the main body and an inner circumference of the plastic sleeve. The annular receiving space is not occupied by any other component so that an annular muffling member can be accommodated in the annular receiving space.