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US 3,978,701 AGranted
Power roll mill guarding device
AssigneeAlfred L. Burden
InventorCharles W. Rhodes
Life of this patent
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AssigneeAlfred L. Burden
InventorCharles W. Rhodes
Estimating the term…
A guard is disclosed for guarding the nip between a pair of rolls in a power roll mill to prevent the mill operator's fingers from being crushed between the rolls. The guard comprises an upstanding plate pivotally mounted transversely between the opposite side frame members of the rolling mill in front of the pair of rolls being guarded. The top of the guard is flat and is located adjacent and below the normal path for the infeed of a sheet of material being formed between the rolls in order that an operator's fingers which support the underside of the sheet will engage the guard and be prevented from entering the roll nip. The guard plate is depressibly supported at its opposite ends by a pair of upright tubular rocker arms which are pivoted at their base and are biased to a central neutral position. At least one microswitch is provided adjacent one of the rocker arms which is in electric circuit with an electric motor which drives the power rolls to turn the motor on and off. An actuator for the switch projects into contact with the rocker arm and is actuated by pivotal movement of the rocker arm to either side of its neutral position in order to open the microswitch and thus to stop the electric motor.
A guarding device for a roll mill having a pair of parallel, superimposed, counter rotating driven rolls forming a nip between the rolls comprising an elongated guard plate spaced in front of and substantially parallel and coextensive in length with the lower most of said rolls, means for pivotally supporting said guard plate to move toward and away from a neutral position, resilient means biasing said guard plate to said neutral position, and means for stopping said rolls responsive to the pivotal movement of said guard plate a pre-set distance away from said neutral position, said guard plate having a top edge which is normally positioned adjacent the level of the nip between said rolls, said means for pivotally supporting said guard plate including resilient means for normally holding the top edge of said guard plate adjacent the level of said nip and for allowing said plate to be depressed downwardly from the level of said nip.
Dependencies are inferred from the claim text.