US Patent: 1,800,982
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| Hydraulic Change-Speed Gear Mechanism
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Patentees:
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| Frank H. Mussler (exact or similar names) - Bridgeport, Fairfield County, CT |
| Edward C. Bullard (exact or similar names) - Southport, Fairfield County, CT |
| Assignees: |
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Bullard Co. - Bridgeport, Fairfield County, CT |
| Manufacturer: |
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Bullard Co. - Bridgeport, Fairfield Countyu, CT |
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Patent Dates:
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| Applied: |
Nov. 21, 1925 |
| Granted: |
Apr. 14, 1931 |
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Joel Havens
Vintage Machinery entry for Bullard Machine Tool Co.
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Description: |
| Abstract:
The present invention relates to speed change mechanism and particularly a power operated mechanism for use in vertical turret lathes and other forms of machine tools and also with any other type of mechanism where the speed of the moving parts are adapted to be changed by shifting gears, for 'the purpose of increasing the speed or power as applied to the machine. The present disclosed embodiment of the invention is adapted for hydraulic operation. An object of the invention is to provide a mechanism of this character by means of which change speed gears may be selectively shifted without the necessity of the operator actually moving the gears, and to this end it is proposed to provide a machine in which a dial or other suitable indexing means is provided, containing indications of the varying speeds and ratios of the gears, and which may be set at any desired position, whereupon the automatic means of the invention is adapted to shift the gears into the relation selected upon the dial. A further object is to provide a mechanism which will be substantially instantaneous in operation and in which a plurality of gears may be simultaneously moved without interfering with each other. A still further object is to provide a fluid pressure gear change means in which the flow of the fluid will be accurately controlled, and effectually retained against leakage, and to this end it is proposed in the present embodiment to provide a rotatable cylindrical valve member having a substantially fluid type bearing in a cylindrical valve chamber.
Claim:
In a change speed gear mechanism, transmission gearing including a plurality of gears mounted coaxially and adapted to be shifted, a plurality of parallel fluid pressure cylinders, a piston in each of said cylinders, means connecting said respective pistons to said respective gears whereby the latter are shifted upon movement of said pistons, said cylinders having ports at each end, a cylindrical valve chamber, a cylindrical rotary valve therein having an inlet passage, a plurality of longitudinally spaced radial ports connected with said inlet ports, and a plurality of longitudinal fluid pressure outlet passages having a plurality of longitudinally spaced radial ports connected with said piston cylinders whereby upon rotative adjustment of said valve means the pistons are adapted to be selectively moved in either direction. |
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