Patent GB-110206-A (GB)
Title: Improved Machine for Grinding, Smoothing or Polishing Surfaces.
Inventor: O'BRYEN REGINALD
IPC: B24B7/18
Filed: 1916-10-18
Abstract: 110,206. O'Bryen, R. Oct. 18, 1916. Floors and like surfaces, treating.-In machines of the kind in which an internal-combustion or other motor drives a rotary grinding, smoothing, or polishing tool, and also propels the machine over the surface to be tested, the reducing-gear by which the travelling wheels are driven from the main shaft is arranged to permit the travel to be reversed or stopped without affecting the rotation of the tool. The main shaft 77 is coupled to the motor shaft by a clutch 78, 79, and drives the tool shaft 118 by bevel-gearing. The travelling wheels 4 are fixed on an axle 102 which is driven by spiral wheels 101, 98, 97; the wheel 97 is secured on the hub of an annular wheel 90 coaxial with the shaft 77 and forming the driven member of an epicyclic train, of which the driving-member is a pinion 81 secured on the shaft; a compound pinion having three rings of teeth is mounted in a cage 86, the central ring of teeth gears with the pinion 81 and with an annular wheel 93, the right-hand ring gears with the annular wheel 90 and the lefthand ring with an annular wheel 94. The wheel 93 is slightly larger and the wheel 94 slightly smaller than the wheel 90; both wheels 93, 94 are fitted with brake bands bv which they may be locked. The wheel 90, and hence the travelling wheels, is driven in one direction or the other according to which of the wheels 93, 94 is locked. If both are free, no movement is transmitted. The brake bands are each controlled by an eccentric on a shaft 110; one end of each band is linked to an eye-bolt fixed in the casing, and the other is jointed to the rod of its eccentric; the shaft is coupled by gearing and linkwork to a hand-lever 59. The machine shown in Fig. 1 is driven by an internal-combustion engine 7 provided with a petrol tank 17, a casing 19 for the radiator and a fan which is driven by a chain 50, a magneto driven by a chain 48 and spur gearing 48<a>, and a folding starting-handle 40 connected by chain gear to a sleeve movable axially on the engine shaft and having a cam slot to engage a pin fixed therein. The machine is supported at the front by the driving-wheels 4 and at the rear by a pair of steering-wheels 5, the axle of which runs in a sleeve secured to the lower end of a vertical shaft 34; the upper end of this shaft is geared by worm and wheel to the spindle of a hand-wheel 76, the casing for the gearing forms on its upper surface a dial acting in conjunction with a pointer on the shaft to indicate the direction of steering. The front section 11 of the casing which encloses the gearing for driving the tool shaft is formed with a large opening, the cover of which carries the toolshaft bearings; by liberating its fastenings, the cover together with the shaft, its bearings, the bevel-wheel 117, and the tool may be removed bodily. Similarly, the bearing 123 for the front end of the shaft 77 may be drawn out bodily leaving an opening through which the pinion may be removed. On the front end of the shaft 77 is a pulley 13 for driving a wall-dressing or other tool. Fenders 14 to prevent contact of the machine with walls &c. may be fitted at the front and sides. The tool consists of a boss 124 secured to the shaft 118 to which the holders 126 of the abrading &c. blocks 127 are coupled by links 125.