| 摘要 |
<p>An ensemble of frame-holder devices is made up by three elements. A frameholder (1) is constituted by a runner (19) provided at least with two claws (2,3) and a fixing device (13) of same on the frame, and an upper spring (6) liable to contract by the action of a chain or rod tightener (9,10). A second element is an extending one which allows the frame holder (1) to be placed at a lower level and made up by a claw (25) and a body (26) provided with a lodging (27) for the claw (2,3) of the above mentioned runner (19). A third element is constituted by an inverted U-shaped piece (29) provided with a device (36,37) to adjust the width of its way, and having each grooves (32,33) subject to lodge the claws (2,3;25) of the runner (19) and or of the extending element (26).</p> |
