Specifications

MIL-STD- 1472E
5.4.2.2,5 Handwheels (two-hand operated).
5.4.2 .2.5.1 & Handwheels, designed for nominaI two-hand operation, should be used when
the bmkout or rotational forces are too high to be easily overcome with a one-handed control,
provided that two hands are available for this task. Typical applications are steering, latch securing,
valve opening/closing, and direct-linkage adjustment.
5.4.2 .2.5.2 Turning aids. Knurling, indenting, high-friction covering, or a combination of
these shall be built into the handwheel to facilitate operator grasp for applying maximum torque and to
reduce the possibility of the wheel’s being
jerked from the operator’shands.
5.4.2 .2,5.3 Spinner handles For applications where the wheel may be rotated rapidly through
several revolutions, a spimer handle may be added, except where it is vulnerable to inadvertent
displacement of a critical wheel setting or if it creates a safety hazard.
5.4.2 .2.5.4 Direction of movement. Except for valves (see 5.4.1.2.4), handwheels shall rotate
cldcwise for ON or INCREASE and counterclockwise for OFF or DECREASE. The direction of
motion shall be indicated on the handwhed, or immediately adjacent thereto, by means of arrow and
appropriate legends.
5.4.2 .2.5.5 Dimensions. resistance, displacement and separation. Control dimensions,
resistance, displacement and separation between edges of adjacent handwheels shall conform to the
criteria in Table IX.
5.4.2 .2.5.6 Steering wheel
Sk~.
Except for established uses in submarines, armored combat
vehicles, aircrz&$and other applications where maximum wheel deflection does not exceed
120°, all steering wheels shall be round.
5.4.2 .2.5.7
Powerstuxing faihm. Steering systems shall provide sufficient mechanical
advantage to meet the force requirements of Table IX, even when the primary operating mode is power
assisted, i.e., the operator shall be able to steer the vehicle to a safe stop if power fails.
5.4.2 .2.5.8 Steering ratio. Maximum turning limits of vehicles shall be achieved with not more
than 31/2 turns of the steering wheel if consistent with fome iimits of Table IX.
5.4.3 Linear controls.
5.4.3.1 Discrete linear controis.
5,4.3.1.1 Push buttons (finger or hand operated).
5.4.3 .1.1.1 ~. Push buttons should be used when a control or an array of controls is needed
for momentary contact or for actuating a locking circuit, particularly in high-frequency-of-use
situations, Push buttons should not be used for discrete control where the functions status is
determined exclusively by a position of the switch, e.g., an on-off push button that is pressed in and
retained to turn a circuh on and pressed again to release the push button and turn the circuit off.
S 4 1 I I.2 Shap The pllsl) hlttl(m sllrface 4WUIMhe c(mcave (’inden[e(i)((l fit th(’fin~cl
WIW [h]sISimprw..t]~al,[he surl’ac.eshall provide a high degree of frictional resistance,