US Patent: 1,018,222
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| Tail-stock-clamping mechanism
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Patentee:
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| Alonzo W. Whitcomb (exact or similar names) - Worcester, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 27, 1909 |
| Granted: |
Feb. 20, 1912 |
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Joel Havens
"Vintage Machinery" entry for Whitcomb-Blaisdell Machine Tool Co.
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Description: |
| Southgate & Southgate - patent attorneys
This invention relates to improved mechanism for clamping the tail-stock of a lathe to the shears or ways of a lathe bed. One usual clamping mechanism employed for this purpose consists of a strap bearing against the under side of the inside lips of the shears or ways of the bed, which strap is carried by two bolts which project up through the tail-stock and which are provided with nuts which can be turned by means of a wrench to tighten one nut and then the other. This arrangement has the disadvantage that the clamp is applied at the middle of the tail-stock so that as the tail-stock receives the thrust from the tool (the resultant action of which gives an upward strain), the pressure is apt to lift or spring the front of the tail-stock upwardly and thus to distort the work on the centers. This common arrangement also has the disadvantage that one side of the clamp is tightened before the other and often with a different degree of pressure which may throw the tail-stock out of accurate position on the ways of the bed. To overcome these objections, I have provided a new and improved tail-stock clamping mechanism which consists of a lever fulcrumed to the tail-stock and having engagement under the lathe bed and of means for applying pressure for operating said lever to lock the tail-stock to the bed. The engaging faces of the lever are preferably arranged under or near the front face of the tail-stock so as to clamp the same to the lathe bed at the most advantageous position to resist strain from the cutting tool. In addition to providing a single locking lever, I usually provide another lever which is arranged to engage under the shears of the lathe bed near the rear face of the tail-stock and I arrange the operating mechanism so that the pressure is applied to lock the tail-stock to the ways at practically the four corners thereof. When two levers are employed, I arrange the ends thereof to bear on each other and apply the operating means directly or through a compounding lever thereto so that one hand-wheel or lever will operate all the locking faces at the same time. The locking levers are arranged with a certain amount of play or lost motion so that they can adapt themselves to their engagement whereby the same will yield so that the locking or clamping strain will be practically the same at all four corners of the tail-stock. Thus by manipulating one handle, the tail-stock can be rigidly locked to the bed at all four corners.
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