Peck feed drilling machine
AssigneeDoler Inc.
InventorsDanny R. Jinkins, Douglas D. Doeden
Life of this patent
Estimating the term…
Abstract
A peck feed drilling machine incorporates a pneumatically operated vane motor and peck feed components. The vane motor drives a conventional drill bit through a speed reducing gear train. The peck feed assembly includes a plurality of multi-state shuttle valves which cooperate with a drilling feed piston, a peck piston and a clutch assembly to incrementally advance and fully retract the drill bit to peck drill an aperture. The drilling machine also includes a dashpot which adjusts the feed rate of the drill bit, a second dashpot for slowing the drill bit as it breaks through the workpiece and countersinks, a threaded mechanism for adjusting the depth of drilling and a spring mechanism for slowing the advance of the drill bit just before it engages the workpiece.
Claims40
A peck feed drilling apparatus comprising, in combination,
- means for rotating a drill bit,
- means for advancing and retracting said drill bit, including
- a feed rate control having a translating rod,
- a feed piston disposed for translation within a chamber and defining a peck cylinder,
- a peck piston disposed for translation within said peck cylinder,
- a clutch operably disposed between said translating rod and said peck piston, and
- control means for cycling said advancing and retracting means.
A peck feed machine comprising, in combination,
- means for rotating a tool,
- means for advancing and retracting said tool rotating means relative to a workpeice, including
- a feed piston operably coupled to said means for rotating and disposed for translation within a housing defining a feed cylinder,
- a peck piston defining an aperture and disposed for translation within a peck cylinder,
- a feed control dashpot operably disposed between said housing and said tool rotating means and having a rod extending through said aperture and
- clutch means for selectively coupling said peck piston to said rod and
- fluid control means for cycling said advancing and retracting means.
A peck feed drilling apparatus comprising, in combination,
- pneumatic drive means for receiving and rotatably driving a drill bit, said drive means having a first housing,
- a feed rate control having a second housing coupled to said first housing,
- a feed piston coupled to said second housing and disposed in a feed cylinder and a rod extending from said feed rate control into said feed cylinder,
- said feed piston defining a peck cylinder having a peck piston disposed therein, said peck piston defining an opening for receiving said feed control rod,
- a pneumatically operated clutch for selectively coupling and decoupling said peck feed piston and said feed control rod, and
- pneumatic control means for cyclically advancing and retracting said drill bit.
A peck feed tool operating on a repeating advance, machine by distance, retract cycle comprising, in combination,
- means for rotating a tool, and
- means for advancing and retracting said tool rotating means including,
- a feed rate control,
- a feed piston disposed for translation within a feed cylinder,
- a peck piston disposed for translation within a peck cylinder,
- an on-off valve having a first, operating position and a second, non-operating position, manually engageable means for selectively positioning said on-off valve in said first or said second position and means for translating said on-off valve to said second position in response to a pneumatic signal,
- a control valve in fluid communication with said on-off valve and movable between a first, tool advancing position and a second, tool retracting position,
- peck valve means for sensing the completion of the machining step of said repeating cycle and providing a pneumatic signal to said control valve to move said control valve to said first, tool retracting position,
- retract valve means for sensing completion of the retract step of said repeating cycle and providing a signal to said control valve to move said control valve to said first, tool advancing position,
- means for sensing attainment of desired machining depth by said tool, and
- shut off valve means in fluid communication with said attainment sensing means for providing said pneumatic signal.
In a peck feed drilling machine having a motor output for coupling to a drill bit or other machining tool and a reciprocating drive mechanism for cyclically advancing and retracting said machining tool, the improvement comprising,
- a feed rate control having an axially translating rod extending therefrom,
- peck piston means for establishing the distance of the machining step of each peck cycle,
- clutch means for selectivley coupling said peck piston to said rod, and
- spring means engageable by said rod for retarding translation of said machining tool prior to the commencement of said machining step of a peck cycle.
A peck by distance machine comprising, in combination,
- a machine housing,
- drive means slidably received in said machine housing for receiving and rotating a tool,
- translating means disposed in said machine housing and coupled to said drive means for bi-directionally translating said drive means relative to said machine housing,
- peck by distance means disposed in said housing and coupled to said drive means for controlling said bi-directional translation of said drive means,
- said peck by distance means including
- a feed control operably disposed between said drive means and said machine housing and having a housing and a translating rod extending therefrom,
- peck means disposed in said machine housing for advancing said drive means a preselected peck distance each peck cycle,
- clutch means for selectively coupling said peck means to said translating rod and
- control means operatively associated with said translating means and said peck by distance means for cyclically, bi-directionally translating said drive means relative to said machine housing.
Dependencies are inferred from the claim text.