Patent GB-190414983-A (GB)
Title: Improved Construction of Circular Saw Guard.
Inventor: HERRMANN LEONARD EDUARD
Filed: 1904-07-04
Granted: 1905-06-01
Abstract: 14,983. Herrmann, L. E. July 4. Sawing. - In an automaticallyacting saw-guard, the frame 4, on which the members of the guard are pivoted, is supported by a horizontal bar 3 placed at an angle to the saw and adjustably clamped in a vertical standard 2 fixed to the sawbed 1. The frame 4 may be adjusted, to suit the size of saw &c., by means of an intermediate slide piece 30 which guides the horizontal movement of the frame by ribs 28 thereon, and, with the frame, itself moves vertically by sliding between ribs 42 in the head-piece 31 of the supporting- arm 3. When adjusted, the three parts are clamped together by a lever 39 on a bolt 29 passing through a horizontal slot 40 in the frame 4, and a vertical slot in the headpiece 31. The guard proper consists of a linkwork of several members. At the lower end 11 of a lever 12 pivoted to the frame 4 is pivoted one member 7 of an articulated curved bar 9 ; this member is controlled by a spring 13 and is connected with the lower member 6 by a spring 8 and a rod 14. The rod 14 is pivoted to the lower member, and engages, in a notch, a pin 15 in the upper member, a spring 16 keeping it in position ; to the rod 14 is pivoted another rod 17, having a slot 18 sliding along a pin 19 in the frame 4. A rigid web 6<a> protects the saw. The wood being fed to the saw meets the toothed roller 20, and pushes the guard before it so that eventually the roller 20 rides on the upper surface of the wood. If the lower member 6 be moved before the pin 19 meets the end of the slot 18, it knocks the notch in the rod 14 away from the pin 15, allowing the jointed bar 9 to straighten itself. As the lower portion of the guard moves before the wood, the lever 12 is moved about its pivot, and the roller 21 at the upper end is raised off the end of a rocking lever 22, also pivoted to the frame. The other end of the rocking lever 22 is connected by a link 23 to a second member of the guard, in which a slotted bar 24 works on a pin 25. When the roller 21 is raised from one end of the rocking lever 22, preponderance of weight causes the other end to drop, until a roller 26 at the lower end of the slotted bar 24 rides along the surface of the wood, and at the end drops behind, when a handle 35 on the bar 24 may be gripped and a final push given to feed the wood, which is guided by the usual adjustable plate 33. A sawblade guard 27, slightly thicker than the saw 5, is employed to open out the wood after cutting. On withdrawal of the wood, the parts automatically return to their normal arrangement. In a modification, instead of the lever 12 with the articulated guard-parts pivoted thereto, a single, rigid, circular segment is substituted, pivoted in the same position on the frame 4, with straight sides terminating in rollers which would occupy the same positions as the rollers 20, 21 in the form described above, a connecting, circular, flanged web protecting the saw. Catches 37, 38 on the frame 4 serve to retain the linkwork in raised position when it is desired to withdraw or exchange the saw.