US Patent: 2,245,471
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| Friction Clutch for Lathe Aprons
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Patentee:
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| George L. Garvin (exact or similar names) - South Bend, IN |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 10, 1940 |
| Granted: |
Jun. 10, 1941 |
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Patent Pictures:
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Joel Havens
South Bend Lathe History
"Vintage Machinery" entry for South Bend Lathe Works
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Description: |
| Oltsch & Knoblock - patent attorneys
This invention relates to improvements in friction clutches for lathe aprons, and more .particularly to a clutch on the lathe apron which is intended to establish a driving connection between two parts of a gear train which are normally free for relative movements. The gear train is driven by the lead screw of the lathe, and is selectively engageable by suitable gear shifting means with gearing associated respectively with a longitudinal rack on the lathe bed, and with a cress feed shaft controlling the position of a tool carrier transversely of the lathe bed. The gear shifting means requires the use of a clutch for releasing the gearing from driving engagement for its operation. The primary object of the invention is to provide a compact, powerful, simple and substantially wearproof clutch of this character. A further object is to provide a device of this character with an idler gear having a hollow portion and normally freely rotatable on a member constituting another part of a gear train, and a friction clutch including a toggle acting upon a sectional shoe fitting within the hollow portion of the idler gear for the purpose of selectively establishing a driving connection between the idler gear and the remainder of the gear train. A further object is to provide a friction clutch comprising toggle members fitting within a sectional shoe, and means for tilting said toggle members, whereby a slight movement of said toggle members effects expansion of said shoe with great force and power. A further object is to provide a device of this character which will not stick:, and which may be positively and instantly actuated to desired position. A further object is to provide a device of this character having a longitudinally shiftable actuating shaft engaging a pair of toggle members, with said shaft loose in its mounting to permit equalization of the force exerted by the operating toggle members. A further object is to provide a device of this character having a pair of plate segments fitting within a hollow two-piece clutch shoe with their inner ends received in a notch in a longitudinally shiftable actuating shaft.
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