Patent GB-191002214-A (GB)
Title: Improved Portable Saw Mill.
IPC: B27B15/02
Filed: 1910-01-28
Granted: 1910-06-02
Abstract: 2214. Marks, E. C. R., [Watkins, B. F.]. Jan. 28. Portable bandsaw machines; tables. - A portable saw-mill comprises a saw - carriage running on rails 4, Fig. 1, secured to a logcarriage which consists of wooden side sills 1, intermediate beams 2, Fig. 3, and I- iron cross-beams 3 and is mounted on wheels 6<1>, 7<1> in such a manner as to allow it to be lowered on to the ground when in position. In the middle of the front axle 6 is fixed a casting having lugs 11, Fig. 4, to which the shaft 9 is hinged, and formed with a projection 12, to which is hinged a part 13 having a circular head seated in a casting 14<1> provided with arms 16, which, when the log-bed is held up for transportation, are secured to the beam 2 by bolts 18, 19 passing through slots 20. The back axle 7 is provided with arms 22, Fig. 6, by which it may be secured to the logbed by bolts 23 passing through slots 24 in the side sills. When the log-bed is in position for sawing, the bolts 18 are removed and the bolts 19, 23 slackened and allowed to slide in the slots 20, 24 so as to lower the bed gradually on to the ground as shown in Figs. 4 and 6. The construction of saw - carriage preferably used comprises (1) two trucks, running on the rails 4 and composed of channel-irons 26, yokes 27, and axles 28, (2) vertical channel-iron posts 31 secured to the yokes 27 and braced by a crossbeam 33 and guy-rods 35; and (3) a band-saw 56 carried by wheels 55, 59 mounted on collars 37, 38 which are connected by a cross-beam 39 and carry pinions 37<1>, 38<1> engaging racks 32, 32<1> mounted on the posts 31. The pinions 37<1>, 38<1> are keyed to a shaft 40 extending through the collars 37, 38, and provided with a hand-wheel 41 by which the frame carrying the band saw can be raised and lowered on the posts 31. The frame is held in position by gravity pawls 42, 43 engaging ratchet-wheels 44, 45 on the shaft 40. The pawls may be disengaged when adjusting the height of the frame by chains 46 attached to a rotatable shaft 47 provided with hand-levers 48. A steam or other motor 49 may be secured to the collar 38 so as to drive the wheel 55; and the saw-wheel 59 is mounted on a stud axle 60 carried by a plate 63, which is seated in the face of a dovetailed block 61 sliding laterally on the collars 37. The band saw is put in tension by the pressure on the blocks 61 of a spring 70 arranged between the block and an adjustable nut 66 carried by a rotatable bolt 67. The saw-carriage may be moved along the rails 4 either by power or by means of cranks or handles 76 on the shaft of sprocket-wheels 74 arranged on each side of the carriage and connected by operating-chains 79 to sprocket-wheels 78<1> on the axles of the front wheels 28. The logs to be cut are held in position against the stress of the saw by knees and dogs arranged opposite to one another. The knee may consist of a holding-part 86 attached by a removable pin 87 to a base-part 83, which is secured to an I-beam 3 by a pin 88. The dog may consist of a pointed dog member 95 attached by a pivot pin 96 to a base-part 92, which is secured to the I-beam 3 by a set-screw. When the log has been cut to a low level it may be elevated for further cutting by means of a bar 98 sliding freely in the upper face of the base-parts 92 and fixed in the base part 83 by a removable pin.