A pneumatic screwing device includes a spindle for rotatably supporting a screwing tool, a pneumatically drivable rotor for rotating the spindle and a stator for housing the rotor. A gap is defined between the rotor and the stator to receive pressurized air and a supply conduit in the stator deliver
A pneumatic screwing device includes a spindle for rotatably supporting a screwing tool, a pneumatically drivable rotor for rotating the spindle and a stator for housing the rotor. A gap is defined between the rotor and the stator to receive pressurized air and a supply conduit in the stator delivers pressurized air to the gap. Discharge conduits in the stator discharge pressurized air from the gap. In order to make the pneumatic screwing device more efficient than known devices, there is provided an expansion chamber in communication with the discharge conduits for expanding the pressurized air, the expansion chamber being positioned on an opposite side of the spindle with respect to the rotor and being in communication with the atmosphere. A switch for switching a screwing direction of the pneumatic screwing device includes seats arranged for engaging with locking elements that are slidably associated with the screwing device for maintaining the switch in an operating position corresponding to a desired screwing direction of the device. In order to make the switch more reliable and easier to handle, three seats are provided that are arranged in sequence, the locking elements engaging in the operating position with two of the three seats.
대표청구항▼
1. A pneumatic screwing device, comprising a main body;a spindle for rotatably supporting a screwing tool, said spindle projecting from a first end portion of said main body;a rotor that is pneumatically rotatable for rotating said spindle;a stator for housing said rotor, a gap being defined between
1. A pneumatic screwing device, comprising a main body;a spindle for rotatably supporting a screwing tool, said spindle projecting from a first end portion of said main body;a rotor that is pneumatically rotatable for rotating said spindle;a stator for housing said rotor, a gap being defined between said rotor and said stator for receiving pressurized air;a supply conduit element arranged in said stator for delivering said pressurized air into said gap;a discharge conduit arranged in said stator for discharging said pressurized air from said gap;a cover positioned in a second end portion of said main body opposite said first end portion;a handle connected with said second end portion of said main body;a switch for switching a screwing direction of said screwing device, said switch comprising a cylindrical slider which is slidable within said main body between an operating position in which said screwing device operates in a first screwing direction and a further operating position in which said screwing device operates in a further screwing direction, said slider containing three spaced seats arranged for engaging with a locking device slidably associated with said main body for maintaining said switch in said operating position corresponding to a desired screwing direction of said screwing device, wherein said three seats are arranged in sequence along said cylindrical slider and said locking device engages, in each operating position, two of said three seats; and said cover containing an expansion chamber positioned on an opposite side of said spindle with respect to said rotor and in flowing communication with said discharge conduit for expanding said pressurized air, at least one first opening arranged on one side of said handle, and at least one second opening arranged on a side of said handle opposite said first opening, said at least one first and second openings affording flowing communication between said expansion chamber and the atmosphere. 2. A screwing device according to claim 1, wherein said discharge conduit comprises a first discharge conduit obtained in an upper portion of said stator and a second discharge conduit obtained in a lower portion of said stator. 3. A screwing device according to claim 2, wherein said main body includes a manifold facing said first discharge conduit and arranged for at least partially expanding said pressurized air and for conveying said pressurized air from said first discharge conduit towards said expansion chamber. 4. A screwing device according to claim 3, wherein said manifold comprises a pair of internally hollow protrusions. 5. A switch for switching a screwing direction of a pneumatic screwing device, comprising a cylindrical slider which is slidable in a body of the screwing device between an operating position in which the screwing device operates in a first screwing direction and a further operating position in which the screwing devices operates in a further screwing direction, said cylindrical slider containing three seats for engaging with a locking device slidably associated with the body of said screwing device for maintaining said switch in the operating position corresponding to a desired screwing direction of said screwing device, wherein said three seats are arranged in sequence along said cylindrical slider, said locking arrangement engaging, in each operating position, two of said three seats. 6. A switch according to claim 5, wherein said three seats have different depths. 7. A switch according to claim 5, wherein two of said three seats have the same depth which is greater than the depth of the remaining seat. 8. A switch according to claim 7, wherein said three seats are arranged with said remaining seat interposed between the other two seats, said locking device engaging, in each operating position, said remaining seat and one of the other two seats. 9. A switch according to claim 5, wherein said three seats have concave abutting surfaces, respectively. 10. A switch according to claim 5, wherein said locking device is pressed against said seats by an elastic device. 11. A switch according to claim 10, wherein said elastic device comprises a first spring and a second spring. 12. A switch according to claim 11, wherein said first spring and said second spring have a different stiffness. 13. A pneumatic screwing device comprising a switch as claimed in claim 5. 14. A switch for switching a screwing direction of a pneumatic screwing device, comprising a cylindrical slider which is slidable in a body of the screwing device between a first operating position in which the screwing device is operated in a first screwing direction and a second operating position in which the screwing device is operated in a second screwing direction, said cylindrical slider containing first, second and third seats arranged in sequence along said cylindrical slider; anda locking device which is slidable in the body of the screwing device for maintaining the switch in an operating position, said locking device engaging said first and second seats to retain said cylindrical slider in one of said first and second operating positions and said locking device engaging said second and third seats to retain said cylindrical slider on another of said first and second operating positions.
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이 특허에 인용된 특허 (5)
Chang An-Mei,TWX, Multistage push button for a pneumatic tool.
Chang,Hsin Ho, Pneumatic motor including a rotor in a cylinder between two covers in a shell from which air travels into the cylinder through the covers.
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