GB Patent: GB-191,503,600
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| Improvements in Lathes for Operating Upon Breech Screws and Bushes of Heavy Ordnance.
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Patentee:
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| James Henry Melloy (exact or similar names) - Manchester, Lancaster County, England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 06, 1915 |
| Granted: |
Oct. 14, 1915 |
Espacenet patent
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Joel Havens
Original patent document
"Vintage Machinery" entry for William Muir & Co.
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Description: |
| Note: Early English patents (pre 1916) were numbered by the year and started at patent #1 at the start of each year in January. The patent # used in DATAMP represents the year of issue and the patent #. This patent is #3,600 of the year 1915.
Abstract:
Breech screws and bushes having interrupted threads, as shown in Fig. 8, are cut in a lathe in which the tool adjustments are made automatically, the threads being cut in a continuous operation. The face-plate is driven by a pinion T, Fig. 1, on a shaft R driven by gearing Q or P from a shaft M connected by differential gearing K<1>, Fig. 2, with a shaft H driven at G, F from a motor E. The cross-slide feed-screw is driven for controlling the cut, through reversing gearing 4, hand set. according to whether screws or bushes are to be cut, from a shaft 2 change-geared to a shaft 1 driven slowly in one direction by gearing W from the casing V of the differential, and rapidly in the other direction by gearing 11, 12 from the shaft R, as controlled by a cam-disk 10 operating a clutch Z, positive for the gearing Y and frictional for the gearing 12, the tool slide being brought back by this gear against a dead stop. The cam - disk 10 is driven through change-gear from the wheel 7. Dogs 14 mounted on the cam-disk and the casing V co-operate with a sliding bolt 13 in the headstock. With the work rotating in the direction of the arrow, Fig. 8, and the clutch Z engaging the gearing Y, which is stationary, the tool commences at 20 and cuts to 21. A dog on the disk 10 has an inclined portion which slides the bolt 13 holding the casing V, to release the casing and contact with a stop-portion on the dog, thus arresting the cam and face-plate. The rotation of the casing withdraws the tool the required amount for the next cut, and a dog on the casing V returns the bolt to its original position when cutting takes place from 21 to 22. After a repetition of the dog action, the point 23 is reached. The cam 10 then shifts the clutch Z, engaging the friction drive and returning the tool slide while the work rotates over the unthreaded portion, and finally resetting the clutch for the gearing Y, thus completing the cycle. Backlash, preventing.-The cross-slide feed-screw is actuated by a rotary nut 6 made in two parts, as shown in Fig. 11, to take up back-lash.
H. B. Barlow & Gillett, Chartered Patent Agents |
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