Safety lock-off throttle device
AssigneeThe Stanley Works
InventorHarry S. Jorgensen, Jr.
Life of this patent
Estimating the term…
Abstract
A safety device for a fluid operated tool features a throttle lever which is always freely movable but is normally rendered inoperable to effect tool actuation except in response to a consciously deliberate two step action wherein a first valve control must be actuated before an on-off valve controlling fluid flow may be operated by a second valve control in response to throttle lever operation to drive the on-off valve from a normally closed position to an open position establishing an open fluid flow condition for tool start-up.
Claims18
In a power tool including a fluid operated motor, a housing having a fluid supply passageway for supplying fluid to the motor and an on-off valve mounted in the housing for movement between a normally closed position and an open position for establishing closed and open fluid flow conditions in the passageway, a safety device for controlling the on-off valve comprising first and second independently operable valve controls respectively movable between starting and actuated positions, means in the housing supporting the second valve control for movement in non-interfering relation to the first valve control, the second valve control being freely movable from its starting position toward its actuated position regardless of the position of the first valve control, a selectively operable interlock for drivingly connecting the second valve control in its starting position to the on-off valve solely when the first valve control is in its actuated position for moving the on-off valve between its closed and open positions responsive to movement of the second valve control between its starting and actuated positions, the first valve control in its starting position rendering the second valve control ineffective for moving the on-off valve from its normally closed position.
In a power tool including a fluid operated motor, a housing having a fluid supply passageway for supplying fluid to the motor and an on-off valve mounted in the housing for movement between a normally closed position and an open position for establishing closed and open fluid flow conditions in the passageway, a safety device for controlling the on-off valve comprising first and second independently operable valve controls respectively movable between starting and actuated positions, the second valve control being freely movable from its starting position toward its actuated position regardless of the position of the first valve control, the second valve control in its starting position being drivingly connected to the on-off valve solely when the first valve control is in its actuated position for moving the on-off valve between its closed and open positions responsive to movement of the second valve control between its starting and actuated positions, the first valve control in its starting position rendering the second valve control ineffective for moving the on-off valve from its normally closed position, and releasable locking means operable in response to movement of the first valve control into its actuated position for selectively interlocking the second valve control to the on-off valve.
In a power tool including a fluid operated motor, a housing having a fluid supply passageway for supplying fluid to the motor and an on-off valve mounted in the housing for movement between a normally closed position and an open position for establishing closed and open fluid flow conditions in the passageway, a safety device for controlling the on-off valve comprising first and second independently operable valve controls respectively movable between starting and actuated positions, the second valve control being freely movable from its starting position toward its actuated position regardless of the position of the first valve control, the second valve control in its starting position being drivingly connected to the on-off valve solely when the first valve control is in its actuated position for moving the on-off valve between its closed and open positions responsive to movement of the second valve control between its starting and actuated positions, the first valve control in its starting position rendering the second valve control ineffective for moving the on-off valve from its normally closed position, and releasable locking means movable between engaged and disengaged positions, the locking means in engaged position securing the on-off valve and the second valve control for simultaneous movement with one another upon moving the first valve control into its actuated position with the second valve control in starting position and the on-off valve in normally closed position.
In power tool including a fluid operated motor, a housing having a fluid supply passageway for supplying fluid to the motor and an on-off valve having a tubular body mounted in the housing for movement between a normally closed position and an open position for establishing closed and open fluid flow conditions in the passageway, a safety device for controlling the on-off valve comprising first and second independently operable valve controls respectively movable between starting and actuated positions, the first valve control comprising a lock button supported in the housing in coaxial telescopically surrounding relation to the tubular valve body, the second valve control comprising a valve pin supported in the housing and extending into a longitudinally extending central opening of the tubular valve body in coaxial relation to the valve body and to the lock button, the valve pin being freely movable from its starting position toward its actuated position regardless of the position of the lock button, the valve pin in its starting position being drivingly connected to the on-off valve solely when the lock button is in its actuated position for moving the on-off valve between its closed and open positions responsive to movement of the valve pin between its starting and actuated positions, the lock button in its starting position rendering the valve pin ineffective for moving the on-off valve from its normally closed position, and releasable locking means mounted on the valve body between the valve pin and lock button for selectively interlocking the valve body in its normally closed position to the valve pin in its actuated position whereby the valve body is conditioned for movement between its closed and open positions responsive respectively to operating movements of the valve pin between its starting and actuated positions.
Dependencies are inferred from the claim text.