| 摘要 |
Device for precisely concentrically aligning the openings in the base of the extension arm of a jib with the openings in the head of the outrigger element, especially in wheeled telescopic cranes and working machinery, characterised in that the front suspension of the extension arm (2) is hinged in two planes perpendicular to each other, where in one plane the hinge constitutes a rocker arm (13) rotating on a pin (21) of the bracket (14) of the stationary element (1) of the jib and supported in its lower part of the base with a control screw (16), which is placed in the stationary element (1) of the jib and countered with a nut (17), whereas in the other plane both hinges having a common axis of symmetry with a variable angle of inclination to the perpendicular constitute upper and lower forks (33 and 30) of the rocker arm (13), lower and upper eyes (32 and 31) of the extension arm (2) of the jig, lower and upper pins (11) with handles and cotters (12) and a control sleeve (15) placed in the lower fork (33) of the rocker arm (13), whereas the rear suspension of the extension arm (2) of the jib comprises a roller (18) with a regulated height of suspension on the extension arm (2) of the jib, two-segment race, whose stationary element (9) is on one end fixed with screws (27) with elastic washers (26) to the bracket (22) of the stationary element (1) of the jib and has a lock blocking the transport position of the extension arm (2) of the jib, which is made up of the catch (28) of the stationary element of the race (9), an eye (29) of the extension arm (2) of the jib, a pin (24) with a cotter (25), whereas the other end of the stationary element of the race (9) has eyes of vertical hinges (10)...<IMAGE>
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