Hardware checklist

Checkpoint 1.1: Controls and Latches

Controls and latches should be reachable and operable with one hand and minimal dexterity.


Rationale

Users with little or no use of their hands or with limited reach can have difficulty accessing and manipulating some controls. System controls which are located at the rear of the system cannot be operated by a user in a wheel chair or with limited reach. A user with limited dexterity cannot use latches or controls which require a tight grasping or twisting motion to activate them. A user with one hand cannot open laptop computers which require two latches to be released simultaneously.


Required development techniques

The following techniques are the minimum required to meet Checkpoint 1.1 from the IBM Hardware Accessibility Checklist:

  1. The position of any operable control or any media access shall be determined with respect to a vertical plane, which is 48 inches in length, centered on the operable control, and at the maximum protrusion of the product within the 48 inch length.
    View diagram
  2. Any operable control or media access which is 10 inches or less behind the reference plane, should be between 15 and 54 inches above the floor.
  3. Any operable control or media access which is more than 10 inches and not more than 24 inches behind the reference plane, should be between 15 and 46 inches above the floor.
  4. Operable controls or media access should not be more than 24 inches behind the reference plane.
    View diagram

Recommended development techniques

The above techniques are required; the following techniques are recommended to enhance accessibility.


Required test techniques

Test the hardware to ensure that it complies with accessibility requirements.

Tools

You will need the following tools to test this checkpoint:

Techniques


The following techniques are required to verify this checkpoint:
Action Result

1

Check that each control can be activated with only one hand, requires no tight grasping, pinching, no twisting of the wrist, and requires no more than 5lbs of force to activate. Use a force or torque gauge to measure the force required to activate the control.

Pass:

Fail:

2

The position of any operable control shall be determined with respect to a vertical plane, which is 48 inches in length, centered on the operable control, and at the maximum protrusion of the product within the 48 inch length.

Use a tape measure to determine the vertical plane location.

Measure 24 inches on each side of the control. Move from the control toward the front of the product until the 48 inch plane can be placed directly adjacent to the front.

Measure the distance from each control to the vertical plane.

Measure the distance from each control to the floor.

Pass:

Fail:


©2009 IBM Corporation

Last updated July 01, 2009.