| 摘要 |
FIELD: electrical and radio engineering; cable and wire laying. ^ SUBSTANCE: proposed cable tray designed to first alternate has two open faceted spars joined together by means of crossbars whose ends are secured inside flat spars; faces of the latter inwardly directed to tray are disposed perpendicular to spars; each spar has at least one stiffening rib at least on intermediate face made in the from of groove deepened into spar; crossbars are provided with at least one depression in each of their ends whose shape follows that of groove and they are secured through their butt-ends on intermediate faces of spars so that mentioned butt-ends come in contact with the latter over their entire surface. Ladder-type tray designed to second alternate has two faceted spars joined together by means of crossbars each of whose ends is secured on at least one face of spar; three extreme faces of each spar enclose ends of crossbars, and its remaining faces form side wall of tray. Power line laying system of first design alternate has cable trays designed to first alternate and faceted joining members, each joining spars of adjacent trays; extreme faces of each joining member are disposed in same plane and in opposite directions, each joining member being disposed in planes of open faceted spars of adjacent trays. System of second design alternate has trays designed to second alternate and each of their faceted joining members is mounted on intermediate faces of spars being joined that follow its shape. ^ EFFECT: enlarged useful space for cable products, enhanced stiffness, eliminated occupational traumatism and injure to cable in its laying. ^ 15 cl, 18 dwg |
