초록 ▼

A pneumatic tool has a housing with an external surface and defining a plurality of cavities therein to hold components of the pneumatic tool. The housing defines a motor cavity wherein a pneumatic motor is disposed. Two spaced-apart vents extend from the motor cavity to the external surface of the

A pneumatic tool has a housing with an external surface and defining a plurality of cavities therein to hold components of the pneumatic tool. The housing defines a motor cavity wherein a pneumatic motor is disposed. Two spaced-apart vents extend from the motor cavity to the external surface of the housing, and a muffler is mounted adjacent to one vent. A tubular sleeve, which includes a radially extended discharge portion from which exhaust may escape, is mounted on the external surface of the housing and cooperates with it to define an annular exhaust passageway. The sleeve is rotatable between muffled and unmuffled positions wherein the discharge portion is respectively adjacent to the one vent or the other.

대표청구항 ▼

A pneumatic tool has a housing with an external surface and defining a plurality of cavities therein to hold components of the pneumatic tool. The housing defines a motor cavity wherein a pneumatic motor is disposed. Two spaced-apart vents extend from the motor cavity to the external surface of the

A pneumatic tool has a housing with an external surface and defining a plurality of cavities therein to hold components of the pneumatic tool. The housing defines a motor cavity wherein a pneumatic motor is disposed. Two spaced-apart vents extend from the motor cavity to the external surface of the housing, and a muffler is mounted adjacent to one vent. A tubular sleeve, which includes a radially extended discharge portion from which exhaust may escape, is mounted on the external surface of the housing and cooperates with it to define an annular exhaust passageway. The sleeve is rotatable between muffled and unmuffled positions wherein the discharge portion is respectively adjacent to the one vent or the other. qual to a diameter of a length of coiled tubing supported by the roller assembly. 4. The drive module of claim 1, wherein the drive motor is a reversible hydraulic motor. 5. An individual drive module for use in a traction drive unit for imparting axial loads to tubing engaged by said traction drive unit, said drive module comprising: (a) an independent drive motor with an output shaft; (b) a roller having a circumferential annular groove, the roller supported by rotary bearings and driven by the output shaft of said drive motor; and (c) a housing having a first housing segment to which the drive motor is mounted and a second housing segment selectably attachable to the first housing segment, wherein the second housing segment in cooperation with the first housing segment retains the roller and the support bearings in engagement with the drive motor. 6. The drive module of claim 5, wherein the roller comprises an independently rotatable central roller section and two independently rotatable coaxial outer roller sections, one outer section on each side of the central roller section. 7. The drive module of claim 5, wherein the annular groove has an arc diameter substantially equal to an outer diameter of a tubing supported by the roller. 8. A traction drive unit for imparting axial loads to tubing, said drive unit comprising: (a) a pair of drive modules, each drive module comprising (i) a housing having a central window, (ii) an independent drive motor with an output shaft, and (iii) a roller having a circumferential annular groove aligned with the central window of the housing, the roller supported by rotary bearings and driven by the output shaft of said drive motor, wherein the rollers of the pair of drive modules are opposed and independently driven; and (b) biasing means for independently urging the roller of each drive module into engagement with a tubing supported by the opposed rollers. 9. The traction drive unit of claim 8, wherein the roller has a semi-toroidal annular groove with an arc diameter substantially equal to the outer diameter of the tubing supported by the roller. 10. The traction drive unit of claim 8, wherein the pair of opposed rollers are mounted in an alternating pattern 90° apart from adjacent pairs of opposed rollers along the axis of the tubing. 11. The traction drive unit of claim 8, wherein the drive motor is a reversible hydraulic motor. 12. A traction drive unit for imparting axial loads to tubing, said drive unit comprising: (a) a plurality of pairs of drive modules, each drive module comprising (i) a housing, (ii) an independent drive motor with an output shaft, and (iii) a bearing-supported roller in contact with a tubing, the roller driven by the output shaft of the drive motor, wherein each pair of drive modules have opposed and independently driven rollers and are mounted in an alternating pattern 90° apart from adjacent pairs of drive modules along the axis of the tubing; and (b) tensioning means for independently controlling the axial load applied to the tubing by each roller. 13. The traction drive unit of claim 12, wherein each roller comprises an independently rotatable central roller section and two independently rotatable coaxial outer roller sections, one outer section on each side of the central roller section. 14. The traction drive unit of claim 12, wherein the roller has a semi-toroidal annular groove with an arc diameter substantially equal to the outer diameter of the tubing supported by the roller. 15. The traction drive unit of claim 12, wherein the tensioning means is a spring. 16. The traction drive unit of claim 15, wherein the spring is a coil spring, a Bellville spring, or a wave spring. 17. The traction drive unit of claim 12, wherein the tensioning means is a double-acting hydraulic cylinder. 18. A tubing injector comprising: (b) a traction drive unit for imparting axial loads to tubing, said drive unit comprising: (i) a pluralit