US Patent: 2,068,840
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| Milling Machine
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Patentees:
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| Arthur F. Bennett (exact or similar names) - West Barrington, Bristol County, RI |
| August L. Krause (exact or similar names) - Providence, Providence County, RI |
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Patent Dates:
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| Applied: |
Sep. 12, 1934 |
| Granted: |
Jan. 26, 1937 |
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Joel Havens
"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.
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Description: |
| Gary and Jenney - patent attorneys
We have seen this patent number, one of about 50 listed, on a No. 2B Plain Mill from Brown & Sharpe.
Abstract:
The present invention relates to improvements in milling machines, and is herein disclosed as embodied in a manufacturing type of milling machine including a work supporting table, electrically driven and mounted on ways on a fixed base, together with a cutter spindle which is also electrically driven and is mounted on a carriage for vertical adjustment toward and away from the table. It is a principal object of the present invention to provide novel and improved means for controlling the operation of the work supporting table and cutter spindle to permit a more efficient and safe manipulation of the machine by the operator, and also to insure a high degree of efficiency and accuracy in operation. It is a further object of the invention to provide certain novel and improved features of construction and operation of the several cooperating mechanisms of the machine to produce a better and more efficient machine. With these and other objects in view, as may hereinafter appear, certain features of the invention are concerned with the provision of a novel and improved electrical control mechanism for the machine, and more specifically with the provision of an improved switch mechanism for controlling the starting and stopping of the table and spindle motors. In order to secure a more accurate control in the stopping of the relatively high speed motors utilized, one feature of the invention consists in the provision of a novel and improved viscosity switch which may be mounted directly on the armature shaft of the motor, and is well adapted for consistent and efficient operation at the high speed of rotation developed by the motor shaft. Another feature of the invention consists in the provision of electrical control mechanism for controlling the operation of a viscosity plugging switch to prevent over-travel of the switch mechanism in plugging the motor to a stop, with a consequent tendency for the motor to kick in a reverse direction. Another feature of the present invention consists in the provision of a control mechanism for braking the cutter spindle to a stop which utilizes the braking force of the motor, and causes a mechanical brake to be applied only after the motor and spindle driven thereby have been appreciably slowed down to reduce so far as possible the wear on the brake linings. Certain other features of the invention consist In the provision of a novel safety stop switch for the table motor and a jog switch for the spindle motor which serve to permit a more versatile and complete control of the operation of the machine by the operator. Another feature of the present invention consists in the provision of a novel and improved g pick-off gear case which is well adapted to facilitate the changing of gears, and is so arranged as to prevent movement of the table driving connections including the gears under power with possible injury to the operator while the gear case is open. |
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