Patent GB-396473-A (GB)
Title: Improvements in, or relating to, boring, grinding, and the like machines
IPC: B23Q9/00
Filed: 1932-03-01
Abstract: 396,473. Boring-bar machines; grinding. SALMON, J., Ivy Cottage, Southfield Lane, Middlesbrough. March 1, 1932, No. 6209. [Class 83 (iii).] In a combined boring and grinding machine which is capable of being used on work such as engine cylinders, an inner spindle on which a grinding, buffing, &c. tool may be mounted is eccentrically carried by an outer hollow spindle to which a boring head &c. may be attached. The outer spindle 1 is splined within a driving gear 15 and is rotatable within cone bearings 5 in a quill 7 which is axially slidable in the frame 4 of the machine. The bore 17 of the spindle 1 is formed eccentric at the lower end 19 to support a rotatable sleeve 25, an eccentrically bored bush 23 being attached to the spindle 1 for supporting the upper end of the sleeve 25. Ball bearings 29, 65 carry a shaft 32 eccentrically within the sleeve 25, the arrangement being such that rotation of the sleeve within the spindle. 1, by means of a micrometer or vernier device 31, causes the shaft 32 to be coaxial with the spindle or adjustably eccentric thereto. A boring head 3, Fig. 2, may be attached to the spindle for giving a preliminary machining to a cylinder, and on removal of the head a grinding &c. disc 62, Fig. 1, may be attached to the shaft 32 for finishing the cylinder by grinding. The casing 66 for the bearings 65 and the extension spindle 63 for the disc 62 are removably attached to the spindle 1 and shaft 32 respectively. The driving gear 15 for the spindle 1 is rotated through worm gearing, a shaft 13 and a clutch 12 from an electric motor 10 carried by the frame 4. A worm 39 on the shaft 13 drives a pulley 42 adjustably supported by a bracket 46 and connected by a belt 43 to a pulley 44 which drives a feed screw 37 through a clutch and reversing gearing controlled by a lever 47. A nut 48 may also control the clutch. A nut 50 on the feed screw is attached by an axially adjustable clamp 58 to the quill 7 for feeding the boring or grinding tool axially and is guided in a slot 59 in the frame 4. The upper end of the feed screw is supported by a bracket 35 carried by two pillars 34 attached to the motor 10. A frame 36, slidable on the pillars 34, carries a driving pulley 54 and spring jockey pulley 57 for the belt drive 56 of the grinding-disc shaft 32, the bracket moving in unison with the quill 7 through a nut 49 thereon engaging the feed screw. The pulley 54 is splined on a shaft 51 connected at 52 to the shaft of the motor 10, the upper end of the shaft 51 being split so as to be capable of being expanded by a screw 53 within its bearing and thus secured either in engagement with the motor shaft, as shown, or in a raised disconnected position to prevent rotation of the shaft 32 during boring. The feed screw may be rotated by hand, for adjustment of the spindle 1, by means of a shaft 60 and bevel gearing 61, and the machine may be attached to the work by the base 67, centring being facilitated by the screws 68, Fig. 2. The machine may be used for producing an undercut recess in a bore, by increasing the eccentricity of the shaft 32 until the desired depth of cut has been obtained.