Browse Prior Art Database

Positioning of Shafts

IP.com Disclosure Number: IPCOM000098926D
Original Publication Date: 1958-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Lyncott, JJ: AUTHOR

Abstract

The depicted fluid actuator has at least four discrete shaft displacements, It comprises a cylinder with a pair of beveled pistons A and B mounted for lengthwise displacement, each piston being mounted on the end of shafts X and Y, respectively. Three fluid connections are made to the cylinder, each of which allows fluid to flow selectively either into or out of the cylinder. The fluid connections are controlled by valves V and V2 (not shown), and also V3, Each is a closed, center spool type of valve. The four shaft displacements are achieved by operating these valves as follows:

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Positioning of Shafts

The depicted fluid actuator has at least four discrete shaft displacements, It comprises a cylinder with a pair of beveled pistons A and B mounted for lengthwise displacement, each piston being mounted on the end of shafts X and Y, respectively. Three fluid connections are made to the cylinder, each of which allows fluid to flow selectively either into or out of the cylinder. The fluid connections are controlled by valves V and V2 (not shown), and also V3, Each is a closed, center spool type of valve. The four shaft displacements are achieved by operating these valves as follows:

1. Adjust V(1) to exhaust, V(2) to pressure, and V(3) to its

closed, center position. This causes pistons A and B to

move as a unit to the cylinder position designated by

the numeral 1.

2. Reverse the conditions of V(1) and V(2) from that of

situation 1, with V(3) remaining closed. Pistons A and B

move as a unit to position 2.

3. Adjust both V(1) and V(2) to pressure and V(3) to

exhaust. Pistons A and B move to the port position for

V(3) position 3 (the situation shown in the drawing).

4. Reversal of all valves V(1), V(2) and V(3), after

performing 3, causes pistons A and B to separate so that

piston A travels to position 1 and piston B travels to

position 2 to achieve the maximum combined displacement

of shafts X and Y.

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