USERY SEEKS END TO TRUCK STRIKE
Labor Sec W J Usery Jr presses both sides in trucking strike to compromise and reach agreement, in hope of avoiding ct injunction to end walkout that began on Mar 31 ; hints that Pres Ford will seek injunction under Taft Hartley Act, news conf; sources close to negotiations say that tentative settlement appears to be imminent; strike is beginning to be felt in industries such as auto and other major mfrs as movement of goods and parts is cut; significant force in bargaining has been Chicago Teamsters official Louis Peick and Fenner; illus (M)