US 6,062,118 AGranted

Speed change gear mechanism for lathes

OwnerChi-Nan Leeinventor

Life of this patent

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Abstract

A speed change gear mechanism for lathes includes a driving shaft having a number of first gears securely mounted thereon to rotate therewith, a driven shaft including a number of second gears each rotatably mounted thereon via a bearing, and a chuck shaft including a number of third gears securely mounted thereon to rotate therewith. The number of the second gears is a sum of the number of the first gears and the number of the third gears. Each second gear is meshed with a corresponding one of the first gears and the third gears. A camshaft includes a cam formed thereon, the cam having a number of angular positions that correspond to different speeds of the chuck shaft. A clutch device has a first end selectively engaged with two of the second gears that respectively meshed wvith an associated first gear and an associated third gear to thereby determine a rotational speed of the chuck shaft.

Claims9

Dependent claims

A speed change gear mechanism for lathes, comprising:

a rotatably supported driving shaft adapted to be driven by a power source, the driving shaft including a plurality of first gears securely mounted thereon to rotate therewith,
a rotatably supported driven shaft including a plurality of second gears each rotatably mounted thereon via a bearing,
a rotatably supported chuck shaft including a plurality of third gears securely mounted thereon to rotate therewith, the number of the second gears being a sum of the number of the first gears and the number of the third gears, and each of the second gears being meshed with a corresponding one of the first gears and the third gears,
a rotatably supported camshaft including a cam formed thereon, the cam having a plurality of angular positions that correspond to different speeds of the chuck shaft,
a follower guiding rod including a sleeve mounted therearound, the sleeve being slidable along the follower guiding rod, the sleeve including a follower securely attached to a first side thereof and a clutch securely attached to a second side thereof, the follower being engaged with and thus carried by the cam to cause sliding movement of the sleeve along tbe follower guiding rod, the clutch including a plurality of engaging teeth for selectively, releasably engaging with tvo of the third gears,
means for driving the camshaft, and
means for retaining the cam in one of the angular positions.

4 more elements

A speed change gear mechanism for lathes, comprising:

a rotatably supported driving shaft adapted to be driven by a power source, the driving shaft including a first gear securely mounted thereon to rotate therewith and a second gear securely mounted thereon to rotate therewith,
a rotatably supported driven shaft including a third gear, a fourth gear, a fifth gear, and a sixth gear each rotatably mounted thereon via a bearing, the third gear being meshed with the first gear and having a plurality of side teeth formed on a side thereof, the fourth gear being meshed with the second gear and having a plurality of side teeth formed on a side thereof,
a rotatably supported chuck shaft including a seventh gear securely mounted thereon to rotate therewith and an eighth gear securely mounted thereon to rotate therewith, the seventh gear being meshed with the fifth gear, and the eighth gear being meshed with the sixth gear,
a rotatably supported camshaft including a cam formed thereon, the cam including a first guiding groove and a second guiding groove defined in an outer periphery thereof, the first guiding groove and the second guiding groove being configured to provide a plurality of angular positions for the camshaft of the cam that correspond to different speeds of the chuck shaft;
a follower guiding rod including a first sleeve mounted therearound and a second sleeve mounted therearound, the first sleeve and the second sleeve being slidable along the follower guiding rod, the first sleeve including a first follower securely attached to a first side thereof and a first clutch securely attached to a second side thereof, the first follower being extended into and guided by the first guiding groove to thereby cause the first sleeve to slide along the follower guiding rod, the first clutch including a plurality of engaging teeth formed on each of two sides thereof for selectively, releasably engaging with one of side teeth of the third gear and the side teeth of the fourth gear, the second sleeve including a second follower securely attached to a first side thereof and a second clutch securely attached to a second side thereof, the second follower being extended into and guided by the second guiding groove to cause the second sleeve to slide along the follower guiding rod, the second clutch including a plurality of engaging teeth formed on each of two sides thereof for selectively, releasably engaging with one of side teeth of the fifth gear and the side teeth of the sixth gear,
means for driving the camshaft, and
means for controlling an angular position of the cam.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/137,093Filed 20 Aug 1998
Granted: 16 May 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F16H 63/18
The final output mechanisms being successively actuated by progressive movement of the final actuating mechanism: the final actuating mechanism…
F16H 3/091
Characterised by the disposition of the gears: including a single countershaft
F16H 59/68
Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion: inputs being a function of gearing status
F16H 61/32
With at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted: electric motors ,…