Patent GB-1300021-A (GB)
Title: Gang lawn mower
Inventor: AKGULIAN SAHAG C
IPC: A01B73/04
Filed: 1971-04-19
Abstract: 1300021 Gang Lawn mower JACOBSEN MFG CO 19 April 1971 [9 April 1970] 23260/71 Heading A1F [Also in Division F2]  A Gang Lawn Mower tractor 10 supports two front mowers 27 and 28, two side mowers 29 and 30, and a centre mower 31, Fig. 2. Front Mowers 27, 28 have a sleeve 32, Fig. 6, which receives a shaft 33 attached to a pivot arm 34 mounted on a pin 36 on tractor 10. Spring 37 connected to the arm 34 and tractor 10 transfers some weight of the front mowers to the tractor. Arm 36 has a pin 38 which swings in the path of latch 39 on tractor 10 which serves to hold the front mower in the raised position. Wing mowers 29 and 30 are pivotally supported on tractor 10 through support arm 42, Fig. 10, rigid with tractor 10 for providing a pivot shaft 43 for each mower 29, 30. Pivot arm 44 is piloted on shaft 43 and carries shaft 46 which is telescoped in sleeve 47 secured to the wing mower. A tension spring connected to the mower pivot arm 44 and tractor 10 aids the manual lifting of the mowers 29, 30 into the vertical position. Centre mower 31 is pivoted on tractor 10 by means of a shaft 43 supported on arm 42 and received within a sleeve. Mower pivot arm 51, Fig. 2, extends from a connection with the sleeve to a shaft 52 telescopically received within a sleeve 53 affixed to mower 31. Wing mowers 29, 30 and centre mower 31 are connected through an adjustable linkage 57, Fig. 10, the opposite ends of which are slidable in slots 58 on plates 59 mounted on each of two wing mowers and on the centre mower. On raising wing mowers 29, 30, linkage 57 forces upward on bracket 59 on the centre mower 31 and serves to raise the centre mower. Tension spring 61, Fig. 2, connected to tractor 10 and centre lift arm 51 takes some of the weight of the mower 31. The mowers, all of similar construction, include two side plates 62, 63, Fig. 6, which are connected by cross tubes 64, 66. Reels are rotatably mounted between the plates 62, 63, the plates having large openings to provide for the cutting reel shaft and reel bearings. Gear box 103 contains bevel gears at right angle relation for driving the cutting reel. Bearing member 106, Fig. 7, supported on mower plate 63, supports the adjacent end of the reel shaft. The position of member 106 is adjusted by movement of bolts 116 in slots 114 about pivot bolt 107 by means of a bolt and screw arrangement 108, 109, 112, attached to 62 by means of plate 111. A skid assembly is pivotally mounted on plates 62, 63 and has two spaced side shoes 73 and an intermediate torque tube 74 secured to skid shoes 73. An arm (76), fig 13 (not shown), affixed to the shoes 73 and held to the mower bed knife through a bracket allows pivotal movement of skid shoes 73.  Connector 79, Fig. 7, consists of an inner and outer sleeve, the outer sleeve is connected to the torque tube 74 by means of a pin and ear system and the inner sleeve connected to the mower tube 64 by means of ears 86 and an angle pin which is threaded into the inner sleeve of 79. The sleeves both have a series of holes which may be matched in aligning pairs for receiving a locking pin 91. The arrangement serves to provide adjustment for the distance between the bed knife and mower. Power shafts (26), (136), Fig. 1 (not shown), are connected by a chain and sprocket arrangement and a clutch and gearbox system. Final drive shaft (136) powers the mowers and extends to a forward location on the tractor 10 where it is rotatably supported on tractor 10 and carries a chain and sprocket system to transmit power to all shaft which connects a forwardly extending U-shaft which terminates at a universal joint (143), connected to another shaft extending into a gear box for driving front mower (103), Fig. 3 (not shown). Similar drive means are provided for the wing mowers 29, 30 and centre mower 31. A gearing attachment may be added to the main gearbox, clutch assembly to provide reversing motion of the mower shafts to provide for cutter blade sharpening.