Patent GB-301988-A (GB)
Title: Improvements in or relating to power driven ploughs
IPC: A01B3/66
Filed: 1927-09-27
Abstract: 301,988. Ford, A., and Wills, A. S. Sept. 27, 1927. Propelling by means other than adhesion driving-wheels and racks.-A reversible plough having two supporting wheels on the side near the ploughed land and provided with set-over mechanism for effecting relative movement between. the frame and both. wheels at the headlands transversely to the direction of travel is provided with power driven means for propelling it along an anchored cable. The plough is guided along the anchored cable H<4> by tubes G<5> connected to pivot pins B<6> and surrounding the cable. This cable passes under guide pulleys J, over V-type pulleys J<3>, and round a drum J<4>, being pressed into the V-pulleys by spring-controlled bevelled wheels J<5>. The drum J<4> is driven from a lay shaft N by chain gearing and is connected by bevel and ratchet gearing with the pulleys J<3> so as always to drive the rear pulley. Each pulley J<3>, Fig. 6, comprises a disc K<1> integral with a boss li and carrying one flange K<2>. The other flange K<3> is free to slide on the boss K but connected to the flange K<2> by bolts or pins K<4>, K<5>, some of which have springs K<6> to draw it towards the flange K<2>, while others have collars K' to limit its movement away from it. The springs K<6> tend to make the effective diameter of the pulleys J<3> greater than that of the drum J' so as to keep 'the cable taut. The lay shaft N is driven by a chain N<2> from another shaft 0 connected by two internal expanding clutches and reversing bevel gearing O<5>, P<1> to a shaft P driven through a clutch from the engine A<1>. The clutches are operated by levers O<8>, Fig. 8, linked to thrust bearings O<7> acting on collars O<17> engaging with the expanding-toggles O<6>. The levers O<8> are linked to a sliding rod Q carrying a slotted crosspin Q<2> engaging with a stud R on a rotatable plate R<1>. On the plate R<1> is a spring pawl normally held out of engagement with a continuously rotating ratchet wheel S by one of two plunger bars T, T<1>, the ratchet wheel being driven from the shaft P by bevel and spur gearing. The bars T, T<1> are linked to a pivoted bar T<4> by rocking which one may be raised and the other lowered, so as to allow the pawl to engage for half a revolution and then disengage it. This rotates the plate R<1> through half a revolution and reverses the drive of the shaft 0, N. The bar T<4> is rocked by the set-over mechanism through a. pivoted rod U having collars U<1>, U<2> to engage a bell-crank lever U<3>, Fig. 5. This lever is connected to the bar T' through a rod U<4>, lever U<5>, and link rod U<7>. The shaft. D for setting the wheels B<1>, B<2> over at the headlands is actuated by the epicyclic gearing shown in Fig. 7. One sun wheel V is rigid with the pinion C<3> and shaft D while a second sun wheel V<1> is freely mounted and carries a plate V<2>. The sun wheels mesh with planet wheel V<3>, V<4> rigidly mounted on shafts V<5> carried by a freely mounted spider V<6> connected by chain gearing with the lay shaft N. The plate V<2> carries pins W which can be engaged by either of two coupled pawls W<1> pivoted on a plate W<3>, Fig. 5, held against rotation by an arm W<4>. To bring the set-over mechanism into action one of the pawls is engaged so as to stop rotation of the plate V<2> and cause the epicyclic gear to rotate the shaft D. The set-over mechanism then reverses the drive of the shafts D, N and therefore of the epicyclic gear. The plate V<2> being free to rotate backwards, the sun wheels and shaft D then come to rest. The rocking of the pawls W<1> is effected by the engagement of an abutment member Y, Fig. 2, with a stop on the cable H<4>. The member Y is carried by a push rod actuating a bell-crank lever engaging a collar X<6>, Fig. 5, sliding on the pivot pin B<6>. The collar X<6> engages a bell-crank lever linked to a lever X<1> linked to the pawls W<1>. The stop on the cablemay be constructed to yield so as to allow the plough to travel a short distance after having. engaged it, to allow time for the reversing mechanism to operate. It consists of a fixed, sleeve Y<1> and a sliding sleeve Y<2> connected together by toggle links Y<3> acted on by a spring Y<4>. The lever- X<1> may be operated by hand. The arm W<4> isconnected through a link Z, bell-crank lever Z<1>, Z<2> and link Z<3> to a pivoted lever Z<4> which is slotted to engage a stud Q<4>, Fig. 8, on the member Q<2> to cause a slight rocking of the plate W<3> so as to disengage the operative pawl from the pins W when reversal has taken place. Springs Z<7> tend to maintain the rod U' and lever Z<1> in correct relative positions. According to the Provisional' Specification, a Bowden wire transmission may be actuated by the stop on the anchored cable to move the pawl connected with the epicyclic gearing.