Synthetic plastic broom bristles

Claim 1

AS A NEW ARTICLE OF MANUFACTURE, A BROOM BRISTLE UNIT ADAPTED TO BE BENT UPON ITSELF INTO SUBSTANTIALLY U-FORM FOR ASSEMBLY IN A BROOM CORE OF THE TYPE HAVING A GROOVE TO RECEIVE THE BIGHT OF THE BENT BRISTLE WITH A RETAINING CABLE ENGAGED WITHIN SAID BIGHT, SAID BRISTLE UNIT COMPRISING A FILAMENT OF SYNTHETIC THERMOSPLASTIC MATERIAL IN WHICH THE FIBRES ARE LINEARLY ORIENTED TO IMPART STIFF SPRINGINESS TO SAID FILAMENT, AND INCLUDING A CENTRAL PORTION AND STIFF SPRINGY BRISTLE FORMING PORTIONS EXTENDING THEREFROM, SAID CENTRAL PORTION HAVING ITS LINEARLY ORIENTED FIBRES STRESS RELIEVED TO IMPART RELATIVELY GREATER BENDABILITY AND RELATIVELY LESS BEND RECOVERY TO SAID CENTRAL PORTION THAN SAID BRISTLE FORMING PORTIONS, WHEREBY SAID BRISTLE UNIT IS PREDISPOSED TO BENDING TO FORM A BIGHT WITHIN SAID CENTRAL PORTION WHEN SAID BRISTLE UNIT IS BENT UPON ITSELF PREPARATORY TO INSERTION IN SAID GROOVE OF SAID BROOM CORE.