Patent GB-649837-A (GB)
Title: Improvements in rumbling drums for treating nails, rivets or the like
IPC: B24B31/023
Filed: 1948-06-11
Abstract: 649,837. Rumbling barrels. WARBUR- 'TON, J. W. June 11, 1948, No. 15786. [Class 60] A rotary rumbling drum for treating nails, rivets and like articles, is furnished with at least one perforated screen in its peripheral wall and a baffle plate within the drum extending over such screen at a predetermined distance therefrom and so constructed and arranged that nails and unwanted material can fall on to the screen for the latter to pass through the screen, :said baffle preventing the mass of nails in the drum from falling on to the screen' and damaging any nails held thereby whilst .also serving to facilitate the screening off of said material. A rotary drum 1 of cylindrical or other formation has an inlet 2 in one end wall and a delivery outlet 3 at the other end; the drum wall 10 has three openings 11 each covered by a detachable perforated screen 12, the perforations preferably being smaller than the head of the nails but larger than the diameter of the shank. Associated with each screen 12 is a perforated baffle plate 13, secured by its leading edge (in relation to the direction of rotation of the drum) to the drum wall and free at its other edge. The baffle 13 is spaced from the screen preferably by a distance greater than the length of the nails; the perforations in the baffle plate are preferably relatively large compared with the diameter of the nails but smaller than the length of the nails. The baffle plate may be adjustably secured to the screen. More than one baffle plate may be associated with each screen. The drum may have axial stub shafts, but preferably has friction rings 4 supported, by grooved wheels 6, 6a, in a framework 5. The drum is rotated by an electric motor 7 through belt or chain 8 passing round pulleys or sprockets 9 which drive the two lower friction driving wheels 6a. In order to permit tilting of the drum for discharge of the contents through outlet 3 to a delivery shoot, the drum-supporting framework 5 is supported on a fixed frame 17 by trunnions 18. A toothed quadrant 19, mounted on the axis of the trunnions 18 but fixed to the framework 17, is engaged by a worm 20 on a shaft 21 which is driven through reversing gear from the shaft 26 carrying the friction wheels 6a. The reversing gear is operated by solenoids 32, 33; a lever 34 cooperates with micro-switches to cut off the current and with fixed stops to reset the solencids and put the reversing gear in neutral. Hopper means 40 are provided for discharging a load of nails through hopper shoot 41 into the drum through its inlet opening. The hopper shoot may be mounted so that it can be moved clear of the drum to allow the latter to be tilted, e.g. the short runs on side rails 42 and has a pair of rollers 43 on each side engaging a guide track 44 carried by the drum framework so that the shoot is caused to withdraw from the drum and return automatically as the drum tilts. While the drum contents are being discharged the hopper discharge outlets can be sealed off by a shutter or like means. The drum may have a discharge outlet in its cylindrical wall instead of in the end wall.