Combo Trays

What purpose does a combo tray serve?

One of the most common problems with using a computer keyboard is that if the keyboard or mouse is too high or far away, typing on it can require an uncomfortable posture which can lead (over time) to pain and even injury.

A combo tray allows adjustment of the input work surface (where your keyboard and mouse are located) to the appropriate height, rotation and tilt to accomodate an individual's ideal neutral posture. It can also be used to accomodate multiple neutral postures which are required in sit/stand workstations. In many circumstances, a tray can allow an individual to bring the keyboard and mouse to a much closer, more comfortable and convenient distance from the body than would be possible if the input devices is on the desk.

A palm rest built into a combo tray can offer support for the palms during periods of rest from typing.

How should my combo tray be adjusted?

For most people the ideal height of the combo tray is just below the height of your elbows, as this allows a slightly downward slope (10 degrees) of the forearm to the work surface. The orientation of the tray itself should be tilted negatively (i.e. to match the slope of your forearm) and the rotation should be such that the combo tray is perpendicular to the arm position.

What should I look for in a combo tray?

There are several different types of trays available which vary in quality and design. One of the most important indications of tray quality is rigidity. If a tray is flexible, it will have a tendency to bounce or bend when an individual types on a keyboard which is placed on the tray. Any movement of the keyboarding surface while typing is not advisable.

Trays which are made of thin plastic or particle board will often flex, whereas MDF or heavier duty materials will retain their form even with the weight of your hand or arm resting on one side. Of course, it is important to have a stable arm to support the tray, as an unstable arm will result in a similar 'bouncing' effect when typing.

Palm or wrist rests can serve a useful purpose, however it is important to never rest your wrists on a surface (as this can reduce circulation). Always use your palms to provide contact with any resting surface to ensure an ergonomic neutral resting position.

Some special trays can accomodate unique workstations (such as right angle corner workstations) and trays are available in a wide range of shapes and sizes - make sure to look around to find the right tray for you.