Woodworking – Special-work machine
Patent
1977-06-27
1979-02-06
Simpson, Othell M.
Woodworking
Special-work machine
83867, 83678, 144 2R, 144116, 144218, 144237, 407 31, 407 58, B27E 904
Patent
active
041379560
ABSTRACT:
A wood incisor for perforating the surfaces of a rectangularly cross-sectioned elongate board preparatory to preservative treatment is comprised of sets of paired horizontal and vertical drums arranged in a manner to provide a rectangular passageway of adjustable height and width for passing various sized boards, with each drum having a plurality of outwardly protruding cutting teeth. Each set of drums includes a fixed drum which is driven, and an idler drum which is slideable with respect to its associated fixed drum by actuation of positioning hydraulic cylinders to provide the adjustability of the passageway therebetween. Each of the positioning hydraulic cylinders is joined end-to-end with a cushioning hydraulic cylinder which is connected hydraulically to an accumulator tank containing pressurized hydraulic fluid and air. Thus the position of each idler drum relative to its associated fixed drum is responsive to the lateral force imparted to that set of drums by the board passing therebetween. Accordingly, when a hard spot is encountered into which the teeth will not penetrate fully, the drums separate slightly preventing damage to their teeth. In addition the vertical set of drums is mounted on a carriage which freely moves side-to-side with respect to the path of the board to accommodate warpage or curvature without binding or attempting to straighten the board. The drums are comprised of a plurality of separate thin annular tooth rings having angularly equi-spaced outwardly protruding teeth. Each tooth ring is interspaced by a selected number of thin annular spacer rings, with all of the tooth rings and spacer rings being clamped together on the core of a drum between removable end plates, and being fixed against rotation on the core by means of a key. Accordingly, the lateral spacing between teeth can be varied to that which is optimum for a selected board by placing the proper number of spacer rings between each tooth ring. Also the tooth rings can easily be replaced individually when a tooth is broken. The tooth rings each have a keyway, for receiving the key located on the core of the drum, which is offset from the centerline of one of the teeth by an angle equal to one-quarter of the angular spacing between adjacent teeth. Therefore by reversing every other tooth ring on the drum, the teeth of adjacent rings are interstitially arrayed.
REFERENCES:
patent: 1428308 (1922-09-01), Wiard
patent: 1646955 (1927-10-01), Edwards et al.
patent: 2582658 (1952-01-01), Tackett
patent: 3125141 (1964-03-01), Best et al.
patent: 3478790 (1969-11-01), Augustin
Bray W. D.
Simpson Othell M.
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