| 主权项 |
1. System for assembling a temporary surface with the use of a crane, the system comprising:
a plurality of mats configured to be placed on the ground and interconnected to form the temporary surface, each said mat being configured to withstand the load of a vehicle passing over it, each said mat having at least first, second, third and fourth spaced-apart holes extending therethrough and at least first and second sides opposite one another, each said mat further having a stepped-configuration that includes a first projection extending at least partially along at least said first side of said mat and a second projection extending at least partially along at least said second side of said mat, said first and second projections being offset height-wise relative to one another so that said first projection is lower than said second projection when said mat is upright, wherein said first and second holes are formed in said first projection and said third and fourth holes are formed in said second projection; and a grab head including
a central portion engageable with the crane,at least first and second elongated telescoping supports extending linearly from and in opposite lateral directions relative to said central portion, each of said first and second supports having a central longitudinal axis, anda first jaw disposed proximate to the end of said first support opposite said central portion and a second jaw disposed proximate to the end of said second support opposite said central portion,each said jaw including at least first and second spaced-apart teeth extending downwardly therefrom, each said tooth of each said jaw having at least one flange projecting in the direction of the other said jaw, each said tooth of said first jaw being engageable with one among said first and second holes in said mat and, concurrently, each said tooth of said second jaw being engageable with one among said third and fourth holes in said mat, wherein, at least when said central longitudinal axis of said first and second supports is oriented generally horizontally, said flange of each said tooth of said first jaw is configured to be positioned farther downwardly relative to said central portion of said grab head than said flange of each said tooth of said second jaw,wherein when said teeth are engaged in said respective associated holes in said mat and said jaws are moved toward one another, said grab head is configured to selectively grab and lift said mat, position it on the ground adjacent to another said mat for interconnection therewith and release said mat. |
