Abrégé

A pneumatic saw includes a housing, a piston casing, a piston, and an air guide assembly. The air guide assembly is in the housing, and includes a reversing brake block, an air guide base, a spacer plate on the air guide base, and an air blocking ring on the air guide base. The air guide base includes an air inlet duct for accommodating the reversing brake block, and primary working air ducts communicated with the air inlet duct, and secondary working air ducts communicated with the air inlet duct. The primary and secondary working air ducts respectively includes a longitudinal hole parallel to the air inlet duct, and a transverse through hole communicated with the air inlet duct and the longitudinal hole. The transverse through hole is shielded by the air blocking ring, and the air blocking ring is fixed to the air guide base by a pin member.

Classes IPC  ?

• B23D 51/18 - Machines à scier ou dispositifs de sciage à lames droites, caractérisés uniquement par la structure d'organes particuliersMoyens de support ou d'attache des outils qui, couverts par le présente sous-classe, sont fixés à leur monture à leurs deux extrémités de l'entraînement ou des mécanismes d'avance des outils droits, p. ex. des lames de scies, des archets actionnés hydrauliquement ou pneumatiquement

Abrégé

A pneumatic machine tool comprises a handle with one end being a first pivot connecting end, and a tool head. The handle comprises a main flow channel extending to the first pivot connecting end, and a switch assembly provided in the main flow channel. The tool head comprises a main body, a tool driving assembly disposed in the main body, and two pivot connecting arms formed on the main body and disposed side by side. The two pivot connecting arms are served as a second pivot connecting. The main body is formed with a chamber provided for disposing the tool driving assembly, and at least one secondary flow channel communicating with the chamber and extending to the two pivot connecting arms. The pivot shaft comprises a transfer flow channel and two transfer ports communicating with the channel.

Classes IPC  ?

• B24B 23/02 - Machines de meulage portatives, p. ex. à guidage manuelAccessoires à cet effet comportant des outils de meulage rotatifsAccessoires à cet effet
• B25F 5/02 - Structure des boîtiers, corps ou poignées

Abrégé

A protective cover assembled on an abrasive belt hand tool. The protective cover comprises an annular base and a tightening component. The annular base comprises a notch, a first clamping arm positioned on one side of the notch, and a second clamping arm positioned on the other side. The first clamping arm is formed with a through hole, the second clamping arm is formed with an assembly hole, the assembly hole does not penetrating through the second clamping arm. The annular base comprises a first state for tightening a protective cover mounting portion when the first clamping arm and the second clamping arm narrow the notch, and the annular base comprises a second state that the first clamping arm and the second clamping arm do not narrow the notch. The tightening component comprises a pull rod penetrating through the through hole and a piece arranged on the pull rod.

Classes IPC  ?

• B24B 21/18 - Accessoires
• B24B 23/06 - Machines de meulage portatives, p. ex. à guidage manuelAccessoires à cet effet avec des courroies abrasives, p. ex. avec des courroies sans finAccessoires à cet effet

Abrégé

A pneumatic reciprocating saw comprises a housing, a saw extending into the housing, a pneumatic motor assembled with the housing and a transmission assembly. The pneumatic motor comprises an output shaft, the transmission assembly comprises a driving bevel gear arranged on the output shaft, a transmission bevel gear engaged with the driving bevel gear, a driven rod being arranged on the transmission bevel gear, a pushing block being eccentrically arranged on the driven rod, a transmission rod assembled with the saw, and a thermal insulator sleeved on the transmission rod without being shifting along with the transmission rod. The transmission rod comprises a groove for placing the pushing block to slide therein, when the transmission rod is driven to reciprocate in a linear track, a tail end of the transmission rod not connected with the saw being limited by the thermal insulator to only move in the linear track.

Classes IPC  ?

• B23D 49/00 - Machines à scier ou dispositifs de sciage à lames animées d'un mouvement rectiligne alternatif
• B23D 49/16 - Dispositifs de sciage tenus à la main ou entraînés manuellement à lames droites tenues à leurs deux extrémités entraînés par des moteurs, p. ex. par des moteurs électriques ou magnétiques
• B23D 51/18 - Machines à scier ou dispositifs de sciage à lames droites, caractérisés uniquement par la structure d'organes particuliersMoyens de support ou d'attache des outils qui, couverts par le présente sous-classe, sont fixés à leur monture à leurs deux extrémités de l'entraînement ou des mécanismes d'avance des outils droits, p. ex. des lames de scies, des archets actionnés hydrauliquement ou pneumatiquement