Patent GB-780941-A (GB)
Title: Improvements in or relating to spraying apparatus for use with a tractor
Inventor: HODGES LEONARD SINCLAIR
IPC: A01M7/00
Filed: 1952-11-20
Abstract: 780,941. Crop sprayers. MASSEY-HARRISFERGUSON (SALES), Ltd. Nov. 20, 1953 (Nov. 20, 1952]. No. 29301/52. Class 69 (3). Spraying apparatus for use with a tractor having a power-operable hitch linkage and a power take-off shaft, includes a liquid tank 1, a pump 10 fixed to the underside of the tank and located for coupling with the power take-off shaft 29 when the tank is raised by the linkage, and connections on the tank and pump for the suction and delivery of the liquid from the tank to the spraying means. A stand 5 fixed to the underside of the tank supports it above ground when the tank is removed from the linkage. The linkage comprises hitch pins 3 secured to the side walls of the tank which are engaged by the power-operated hitch links of the tractor which pivot about 3B, Fig. 2, to raise the tank to its operating position. An upper hitch link 8 is pivoted at 8A to a vertical channel 6 secured to the front wall of the tank and its other end 8B is engaged by a hitch pin on the tractor. The link 8 has a cross member 8C, Fig. 4, providing a latch abutment and bars 8D providing a latch guideway which co-operates with a check link 9 pivoted to the channel 6 at 9A. The link 9 is guided between the bars 8D and has a hook member 9B which engages the abutment 8C when the apparatus is raised and thereby holds it in the raised position and relieves the load on the powerlifting system. During spraying the links 8 and 9 may additionally be locked by a pin passing through co-operating holes in the links. A central boom 41 and side booms 40 are secured to the tank and are fed with liquid by the pump via a main control valve operated by a handle 25. The supply to each side boom is further controlled by a cock 20, Fig. 2, which is automatically closed by a link 26 when the boom is raised to a vertical stowage position by a handle 28. The power take-off shaft 29 is detachably connected to the pump drive shaft by means of a socket 30 resiliently secured to a coupling sleeve 32 which is telescopically engaged with a shaft 33 resiliently connected to the pump shaft. To disconnect the shaft 29, the socket 30 is urged rearwards against a spring 35 and may be stowed against a projection 36 on a plate 37 through which the socket normally passes. The central boom 41 is secured to a transverse tube 42 attached to brackets 43 which can be bolted at various heights on vertical angle members 45, The end booms are pivotally mounted to the ends of the tube 42 and include spring hinge members which allow the end booms to swing fore and aft on encountering an obstruction. Each end boom pivots in a vertical plane about a pin 47 on which is pivoted a U-shaped member 47A, Fig. 14. The latter includes bars 54, 55 with hinge pins 56 and and or pins 57 for two tension springs 62. A complementary hinge member consists of plates 59, Fig. 16, between which the boom tube is clamped, the plates having anchor studs 60 for the springs and recesses 61 which co-operate with the pins 56. Stop pins 58 limit the swinging movement of the side booms. Each boom is swung into vertical position by a handle 28 acting through a line 28A passing over a pulley 48 on an extension of the member 45, and the boom is held in that position by a clip 53. Specification 780,942, [Group XXXI], is referred to.