Patent GB-113335-A (GB)
Title: Improvements in or relating to Plows.
Inventor: CAMERON WILLIAM WALLACE
IPC: A01B63/18
Filed: 1917-02-27
Abstract: 113,335. Cameron, W. W. Feb. 27, 1917. Ploughs.-The plough beams of a multiplefurrow plough are raised by the rotation of an eccentric which can be clutched to a shaft carried by crank-webs from the supporting wheels of the plough, the movement of the beams due to the rotation of the eccentric being adapted to swing the crank members about the axes of the supporting wheels, thus increasing the vertical movement of the beams. The ploughs are attached to beams forming part of a plough-supporting frame 2 which is secured to casings 19 forming straps for eccentrics 19<b> mounted to rotate on the shaft 11 carried by crank members 7, 8, 9, 10 from the axles of the furrow and the land wheels 4, 5 respectively. The eccentrics are rotated to lift the casings 19 by the movement of a shaft 19<c> carried by a crank-arm on a sleeve adapted to be clutched to the shaft 11 which is constantly rotated by sprocket and chain connexions with the supporting-wheel axles. The clutch is thrown in by the movement of a lever 45 which forces an outwardly pressed member into a recess in the rotating part of the clutch. After the sleeve and the eccentrics have been moved through 180 degrees the clutch member frees itself, leaving the plough frame in the raised position with another clutch member in position for operation to lower the frame. The usual hand-levers 25, 26 and racks are provided to movo the cranks 7, 8; 9, 10, to adjust the positon of the shaft 11 relatively to the axes of the supporting-wheels, the racks being provided with rearwardly projecting lever arms 21 extending through slotted brackets 22 on the plough frame 2. As the frame 2 is lifted by the rotation of the eccentrics, the arms 21 are moved through their connexions with the racks, hand-levers, and cranks about the axes of the supporting-wheels thus causing an upward movement of the shaft 11 and so a lift of the plough frame in addition to that given by the eccentrics. The brackets 22 are arranged at different distances along the plough frame to give an equal lift at each end of the shaft 11 notwithstanding the difference in position of the axes of the wheels 4 and 5. The one rack is provided with an arm 23 which is connected by a link 24 to a bent lever 31 pivoted to a plate 30 carried at the rear of the plough frame. A link connects this lever to a bracket pivoted at 35 to the plate 30 and carrying a vertical bearing for the pin 6<a> of a rear supporting- wheel 6. The bearing and the pin 6<a> are provided with collars so that, on the movement of the link 24 due to the elevation or depression of the forward end of the plough frame, the rear end of the frame is correspondingly raised or lowered due to the movement of the pivoted bracket carrying the wheel 6. In other positions than the extreme elevated position of the plough frame, the plate 30 passes through a slot in the collar fixed to the pin 6<a> thus preventing the wheel 6 castoring and ensuring a straight furrow. In the extreme elevated position, the plate is clear of this slot and the machine may be turned freely.