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 system and a method for audio adjustment are provided. The method includes following steps. A first output audio signal generated from the under-test audio playback device according to a frequency response test signal is received. The first output audio signal is analyzed to generate a set of suggested equalization parameter. A set of equalization parameters are adjusted according to the suggested equalization parameters, and a sound test signal is generated from an original sound signal according to the equalization parameters and output to the under-test audio playback device. A second output audio signal is generated from the under-test audio playback device in response to the sound test signal. Whether the auditory effect of the second output audio signal is close to the original sound signal or matches the user's need is determined.

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.

Abstract: A grinding machine with a dust collector includes a driving portion, a transmitting portion, a dust-collecting tube, a fender, an air intake connector and a grinding wheel. The dust produced by the rotation of the grinding wheel is sucked by the dust-collecting tube having an inner tube. The inner tube is interconnected with an exhaust vent of the driving portion and the dust-discharging opening. An outlet of the inner tube is parallel to an airflow passage of the dust-discharging opening, such that when an exhaust gas is discharged from the inner tube, a siphon effect is produced at the airflow passage of the dust-collecting tube to suck and collect the dusts produced by the grinding wheel.

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 is connected with an inner annular wall axially extending from one end of the speed-adjusting section and outwardly protruding from the main body. Two opposite pin seats having pinholes are disposed on of the plastic sleeve. 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. 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. An additional annular muffling member can be fitted in the annular receiving space to enhance the muffling effect.

Abstract: An abrasive wheel with improved structure comprises: an abrasive component, an adapting ring received by the combining hole in the central region of the abrasive component, two covers which are posited about both mounting surfaces respectively, wherein each cover at the surface thereof facing to the corresponding mounting surface has a pressing segment and a blocking segment, wherein each pressing segment comprises a plurality of teeth so that after the disclosed abrasive wheel is assembled, the blocking segment leans against the inner wall of the combining hole and the teeth of the pressing segment lean against the corresponding mounting surface, and further, a plurality of raised columns provided at the surface of each cover facing to the corresponding mounting surface and each opening defined by each two adjacent raised columns which is complementary to the shape of the raised columns so that after the disclosed abrasive wheel is assembled, the raised columns of either the cover can be engaged by the openi

Abstract: A pneumatic grinder with improved muffling structure primarily comprises a driving portion, a grinding wheel fixing portion provided at one end of the driving portion, a first housing connected to the other end of the driving portion by means of a combining portion, a second housing mounted onto the first housing, and a plurality of first and second exhaust openings arranged in staggered fashion respectively on the first and second housings. Said structure allows the pneumatic grinder to discharge waste air through foresaid two layers of exhaust openings in staggered fashion arranged in order to reduce noise during air exhaust.