GB Patent: GB-574,859
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| Improvements in or relating to vices and like gripping devices
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Patentee:
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| Alan George Marshall (exact or similar names) - Frome, Somerset, England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 07, 1944 |
| Granted: |
Jan. 23, 1946 |
Espacenet patent
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Jeff Joslin
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Description: |
| The assignee is "J. Evans & Son (Portsmouth) Limited, a British Company, of Adderwell Works, Caxton Road, Frome, Somerset"."The invention is concerned with a vice of the type comprising two relatively movable jaws and a lead screw by means of which the clamping pressure is applied. Where, as is usual, the pressure of the lead screw is applied directly to the moving jaw the latter tends to rise and displace the object held in the jaws, especially when round objects are gripped and particularly when the bearing surfaces become worn. Vices are known wherein the bearing surfaces are provided with special means of adjustment to prevent the jaws rising but these require constant and skilled attention."An object of this invention is to provide an improved vice of the type described giving an effective grip while preventing the jaws from opening or rising under load and retaining this effective drip without adjustment even after considerable wear in the working surfaces has taken place."According to the present invention the effort of the lead screw is not directly transmitted to the moving jaw but is applied to a lever (or lever system) carried by the movable jaw and so arranged that the effective fulcrum reaction is taken by the vice body and the resultant of the effort transmitted to the movable jaw is in a direction extending forwardly (i.e., towards the fixed jaw) and downwardly..." |
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