The upper and lower wall sections 187 and 188 are vertically spaced apart so as to define one of the access ports 51 (FIGS. 25, 33 and 35). To facilitate the connection of two housings 66, the lower wall section 188 has a greater horizontal thickness than the upper wall section 187 ...
The foot 19 may be height-adjustable and includes a cone-shaped support housing 48 which slidably receives the insert 47 within an upward opening chamber 49 thereof. The housing 48 is formed with a threaded bore 51 at the bottom of the chamber 49 which threadedly engages the shank 43 and...
the uppermost aperture 63 of the left side wall 14 is spaced downwardly from the flange 51 the distance d1 while the lowermost aperture 63 is spaced upwardly from the flange 52 the distance d2. As a result, the back wall 15 is connected to the left side wall 14 by moving the back ...
edging51and the frame side rail36connected thereto. The edgings51thereby define bull-nosed protective edges. When the edgings51are connected on the frame rails36, the edgings51preferably are formed of a material which is more deformable than the frame rail36so that each edging51serves as a ...