DAEDALUS TECHNOLOGIES, INC.
MAKING TECHNOLOGY MORE ACCESSIBLE
Fitting the DAESSY Locking Swing-away Mount - DLSA7
Measuring Tube Length and Offsets
Background
The Right Angle Tube supports the DAESSY Locking Swing-Away Mount with the vertical arm of the tube in the Locking Swing Away Outer Piece (LSAOP). This vertical arm must be truly vertical and the LSAOP must be located in the same front-to-back position on the wheelchair as the mounted device. One Offset Link (O3L) is always used with this mount and this allows the Outer Piece to be positioned 3 inches in any direction from the location of the Frame Clamp Inner Piece. An additional Offset Link may be used for greater offset distance.
When the DAESSY Quick Release System is used to attach the device to the Horizontal Tube the centreline of most devices is between 1" and 3" forward of the tube. For very precise horizontal positioning contact Daedalus Technologies, Inc. for more information.
The required offset distance should be measured, the position of the outer piece determined and possible interference with the Vertical Tube identified before the tube length is measured.
Determining the number of required Offset Links, and orientations
X is the front-back offset distance between the location of the Frame Clamp Inner Piece and the LSAOP. T is the required length for the Vertical Tube.
One Offset Link (O3L) provides three inches of offset between the location of the Frame Clamp Inner Piece and the position of the Locking Swing-Away Outer Piece (LSAOP). The Offset Link may be set at any angle, thus the horizontal distance between the Inner Piece and LSAOP may be any measure between zero and 3 inches. With an additional Offset Link in the Frame Clamp Assembly the maximum offset is 6".
Adjusting the angle of the Offset Link to set the required horizontal offset to achieve the correct device location will also affect the vertical distance between the LSAOP and Inner Piece. This may affect the length of Vertical Tube that is required to place the device at the correct height and avoid interference with wheelchair fittings, wheels or the ground.
When the Inner Piece is located low on the wheelchair frame the Offset Link (O3L) would be oriented to place the Outer Piece (LSAOP) higher, particularly if the required location for the for the LSAOP is in line with the front caster wheel.
When the Inner Piece is attached high on the wheelchair frame and the mounted device is positioned for direct access it may be preferable to place the LSAOP lower because the Release Cable and Locking Swing-Away Index Clamp require that the Vertical Tube length be at least 12".
When the mounted device is positioned for scanning or head pointer access the LSAOP may be positioned above the Inner Piece to minimize the required Vertical Tube length.
Avoiding Interference between the Vertical Tube and Fittings on the Wheelchair
When fittings on the wheelchair obstruct the vertical arm of the Right Angle Tube a Frame Clamp Spacer (UFCSPCR) can be used to move the Locking Swing Away Outer Piece (LSAOP) further away from the wheelchair frame. This will increase the clearance width of the wheelchair, which is a consideration for manoeuvring in tight spaces.
When the obstruction is not avoided by the use of a UFCSPCR it will be necessary to compromise on the position of the mounted device and move the LSAOP forward or backward using the Offset Link (O3L).
Caution:
The Vertical Arm of the Right Angle Tube must be truly vertical, not leaning to avoid obstructions.
Determining the Vertical distance and Tube length
The required length for the Vertical Tube is the distance from the Locking Swing-Away Outer Piece (LSAOP) to the bottom of the mounted device. When the Offset Link (O3L) within the Frame Clamp Assembly is at an angle other than horizontal the Vertical Tube Length – T – will not be the same as the distance from the Inner Piece to the bottom of the device. This distance is illustrated in the figure above.
If there are no obstructions with wheelchair components below the LSAOP the Vertical Tube Length can include several inches of vertical adjustment length that will extend below the LSAOP.
There must be a minimum of 12 inches of vertical extent on the Tube to have enough room for the Cable Release Assembly.
Steps in the Fitting procedure
Fitting the DLSA7 has the following steps:
- Selecting a Frame Clamp location
- Measuring and Specifying the Frame Clamp size
- Determining the Offset Links required and the Vertical Tube length
Locking Swing Away Mount