Snusber for vibsating screens

Claim 1

IN A VIBRATING SCREEN, THE COMBINATION COMPRISING: A STATIONARY FRAME INCLUDING A FRAME MEMBER; A SCREEN BOX INCLUDING A SCREEN BOX MEMBER; RESILIENT MEANS MOUNTING THE SCREEN BOX ON THE FRAME FOR LIMITED RELATIVE MOVEMENT IN A FIRST PLANE AND ALSO TRANSVERSELY THERETO; DRIVE MEANS VIBRATING THE SCREEN BOX RELATIVE TO THE FRAME IN SAID FIRST PLANE; AND SNUBBER MEANS AT EACH OF TWO OPPOSED POSITIONS SPACED APART TRANSVERSELY OF THE FIRST PLANE, EACH SNUBBER MEANS INCLUDING A RESILIENT ENERGY ABSORBER ON ONE OF SAID MEMBERS AND RIGID BUMBER MEANS ON THE OTHER OF SAID MEMBERS; SAID ABSORBER AND SAID BUMPER MEANS COMPRISING A PAIR OF ELEMENTS MOUNTED ON ONE OF SAID MEMBERS AND A SINGLE ELEMENT MOUNTED ON THE OTHER OF SAID MEMBERS AT A POSITION BETWEEN AND ALIGNED WITH THE PAIR OF ELEMENTS IN THE DIRECTION OF SAID RELATIVE MOVEMENT IN SAID PLANE; THE SPACING BETWEEN SUCCESSIVE ONES OF SAID ELEMENTS IN THE DIRECTION OF THE RELATIVE MOVEMENT IN SAID PLANE BEING GREATER THAN THE NORMAL RELATIVE MOVEMENT BETWEEN SAID ABSORBER AND SAID BUMPER MEANS AT ORDINARY OPERATING SPEEDS OF THE SCREEN BOX BUT LESS THAN THE RELATIVE MOVEMENT SAID ABSORBER AND SAID BUMPER MEANS AT A RESONANT SPEED OF THE SCREEN BOX; EACH ABSORBER AND BUMPER MEANS HAVING MUTUALLY ENGAGING SURFACES INCLINED TO THE DIRECTION OF RELATIVE MOVEMENT OF THE ABSORBER AND BUMPER MEANS WHEREBY ENGAGEMENT OF THE ABSORBER WITH THE ASSOCIATED BUMPER MEANS PRODUCES A THRUST TRANSVERSELY OF THE PLANE AND THE THRUSTS PRODUCED AT SAID TWO POSITIONS ARE OPPOSITELY DIRECTED AND SUBSTANTIALLY NEUTRALIZE ONE ANOTHER.