High-low speed rotary drive mechanism
US4266444A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Jun 14, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1906
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
High-low speed rotary drive mechanism for rotatably driving driven elements of a tool, for example a hydraulic chuck, while permitting axial movement of the driven elements relative thereto, said mechanism including a housing, a tubular spindle rotatably mounted by the housing top and bottom walls, drive lugs joined to the spindle inner peripheral wall for driving the driven elements, an axially lower main drive gear fixed to the spindle to drive the spindle, a reversible hydraulic motor mounted on the housing for driving the main drive gear at high speed, low torque, an upper gear mounted on the spindle between the lower gear and the top wall for rotation relative the spindle, an elongated rack having teeth intermeshing with the upper gear for driving the upper gear at high torque, low speed, and a poppet type ratchet assembly mounted by the upper gear to rotate therewith. The ratchet assembly includes a ratchet member that in one angular position relative the upper gear is axially movable into a lower gear aperture to transmit a driving force from the upper gear when the upper gear is driven in one angular direction and permit the upper gear rotating relative the lower gear in th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.