Patent GB-803502-A (GB)
Title: Improvements in or relating to carpet sweepers
Inventor: LUNDY ARTHUR JOSEPH
IPC: A47L11/33
Filed: 1954-05-29
Abstract: 803,502. Carpet sweepers. SHORT BROS. & HARLAND, Ltd. Dec. 30, 1955 [May 29, 1954], No. 15964/54. Class 138(1). A carpet sweeper comprises a casing 1, Figs. 1 and 2, provided with ground-engaging wheels 8, a rotary brush 16 located within the casing 1, means 17, 19, 23, for mounting the brush in the casing 1 and cam means 25A adapted to be slid horizontally into and out of engagement with the mounting means, so that the brush can be height adjusted relative to the wheels and casing 1 of the sweeper. Referring to Fig. 3, the sweeper includes a chassis 6 having end walls 13 pivotally supporting dust trays 34 and wheel spindles 9 formed as cranked ends of rods 10 carried by cross-members 11. The spindles at each end of the sweeper are urged together and downwards by a spring 14 the spindles being movable within enlarged hole 12 in the end walls 13. The sweeper casing 1, Fig. 1, fits over the chassis 6 and is secured thereto by screws. Each end wall of the casing 1 has an exterior central and vertical shallow groove to receive a vertically slidable lever 19. A pin 17 on the lever passes through an elongated slot 18 in the casing end wall and is engageable in a bearing in a driving drum of the rotary brush (not shown). At its upper end the lever 19 has a flange 20 which passes through vertical slots 21 in the casing end wall and a bracket 22 welded to the inside of the end wall, the flange 20 abutting the inner surface of the bracket. The lever 19 is urged upwardly by a spring 23 connected to the flange 20 and a tongue 24 on the bracket 22. Slidable horizontally and transversely of the bracket 22 is a bar 25 having a stud 26, Fig. 2, which passes through a horizontal slot 27 in the casing. A profiled projection constituting the cam means 25A on the bar 25 engages the flange 20 when the stud 26 is at one end of the horizontal slot 27 to urge the lever 19 downwardly and thus the brush to its lowest position. When the bar is moved so that the stud reaches the other end of its slot the lever rises and the brush rises therewith to its highest position. The brush may be retained in an intermediate position by a notch on the bar 25 engaging one of a pair of bar supporting lugs 28, Fig. 1, on the bracket 22. To adjust the brush the two levers 19 are operated together and to remove the brush the two levers are pulled outwardly so that the pins 17 disengage the driving drums and the flanges 20 engage the latter to urge the brush downwardly. When the bars 25 are in positions corresponding with the low or intermediate of the brush and the levers are moved outwards of the casing 1 the springs 23 cause the flanges to coact with the cams 25A and pivot the levers in planes parallel to the end walls of the casing so that the pins 17 then abut the outer faces of the casing end walls and remain in these positions until the brush is replaced and the levers remanipulated. The levers 19 are retained in their operative positions by a rubber beading 4 with surrounds the lower edge of the casing 1. The dust pans 34, Fig. 3, are provided at each end with slots 30 engaging pivots 29 fixed to the chassis walls 13. Bridge pieces 31 interconnect the ends of the tongs by having pins 32 thereon engaging in the slots 30. One bridge piece has a flange 31A to which is connected a push button which extends through the top of the casing. The trays are opened against the action of springs 33 by pushing down the bridge piece button.