Screen aligning, tensioning and sealing structure for vibratory screening machine

A quick release draw bolt device comprising a bolt member having first and second end portions and a central portion therebetween, first and second members, an aperture in said first member for movably receiving said central portion of said bolt member, means on said first member for engaging an external member in abutting relationship, a cavity in said second member, a fixed end wall in said second member adjacent said first member defining a first wall of said cavity, a movable end wall in said second member spaced from said fixed wall, apertures in said fixed and movable end walls for movably receiving said central portion of said bolt member, a spring in said cavity between said fixed end wall and said movable end wall in encircling relationship to said central portion of said bolt member, means on said first end portion of said bolt member for engaging a member to be tensioned, a thread on said second end portion of said bolt member, a nut mounted on said threaded end portion of said bolt member for engaging said movable end wall to selectively effect an initial compression of said spring when said nut is tightened, coacting cam means and follower means between said first and second members for permitting said first and second members to assume a first relatively close position wherein said spring is permitted to expand from a compressed condition by permitting said movable end wall to move to an away position from said fixed end wall and for causing said first and second members to assume a second relatively spaced apart position wherein said nut forces said movable end wall toward said fixed end wall to compress said spring therebetween, and turning means for turning said second member relative to said first member to move said first and second members between said first and second positions.

A vibratory screening machine comprising a frame, side walls on said frame, a bed on said frame, a vibratory screen, end edge portions on said screen, channel means on said end edge portions, drawbar means located proximate the junction of said bed and said side walls for engaging said vibratory screen, flange means on said drawbar for entering said channel means, and interfitting means between said channel means and said flange means for aligning said channel means with said flange means for aligning said channel means with said flange means in a direction longitudinally thereof, quick release draw bolt means coupling said side walls and said drawbar means, each of said draw bolt means comprising a bolt member having first and second end portions and a central portion therebetween, first and second members mounted relative to said central portion of said bolt member, cam means and cam follower means effectively positioned between said first and second members for causing said first and second members to occupy relatively close and relatively remote positions with respect to each other, means on said first end portion of said bolt member for exerting a pulling force on said drawbar, and spring means mounted relative to said first and second members for causing said bolt means to exert said pulling force on said drawbar when said first and second members are in said relatively remote position and for releasing said pulling force when said first and second members are in said relatively close position.

A vibratory screening machine comprising a frame, first and second side walls on said frame, a bed on said frame, a vibratory screen, first and second end edge portions on said screen, channel means on said first end edge portion, drawbar means located at the junction of said bed and said first side wall for exerting a pulling force on said channel means, flange means on said drawbar means for entering said channel means, securing means for securing said second end edge portion to said second side wall, and quick release draw bolt means coupling at least said first side wall and said first drawbar means, said draw bolt means comprising a bolt member having first and second end portions and a central portion therebetween, first and second members mounted on said central portion of said bolt member, cam means and cam follower means effectively positioned between said first and second members for causing said first and second members to occupy relatively close and relatively remote positions with respect to each other, means on said first end portion of said bolt member for exerting a pulling force on said drawbar, and spring means mounted relative to said first and second members for causing said bolt means to exert said pulling force on said drawbar when said first and second members are in said relatively remote position and for releasing said pulling force when said first and second members are in said relatively close position.