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1. 发明授权

US3733794A Safe starting system for lawn and garden equipment 失效
标题翻译：安全起动系统用于法律和庭院设备
公开(公告)号：US3733794A
公开(公告)日：1973-05-22
申请号：US3733794D
申请日：1972-03-22
申请人： DEERE & CO
发明人： ALLEN D
IPC分类号： A01D69/00 , A01D75/18
CPC分类号： A01D34/828 , A01D34/6818 , Y10S56/15
摘要： A riding mower has an internal combustion engine with a magneto type ignition system. A mower is suspended from the tractor and driven from the engine through a belt drive, which includes a clutch, while the traction wheels are driven through a different drive system, which also includes a clutch. A pair of series connected switchs are respectively connected to the clutches, so that they are open when the clutches are engaged, and closed only when the clutches are disengaged. The ignition system generates a sine wave voltage in the primary winding, the positive voltage excursion being utilized to generate the high voltage spike in the secondary winding which fires the spark plug. However, the positive voltage excursion in the primary coil can be shorted to ground through a diode and a relay, when the relay is deenergized. The relay is energized when both the safety switches are closed during the negative voltage excursion, so that the primary winding short is interrupted and the engine can be started only when both the clutches are disengaged. After the relay is energized, it completes a circuit in parallel with the safety switches, so that the clutches may be engaged once the engine is started without shorting out the primary winding.

2. 发明授权

US3732671A Electric drive riding mower 失效
标题翻译：电动驾驶台
公开(公告)号：US3732671A
公开(公告)日：1973-05-15
申请号：US3732671D
申请日：1971-08-31
申请人： DEERE & CO
发明人： ALLEN D , APPLE D
IPC分类号： A01D34/64 , A01D69/02 , A01D69/04
CPC分类号： A01D34/64 , A01D34/78 , A01D69/02 , A01D2101/00 , B60L3/0061 , B60L11/1805 , B60L2240/36 , Y02T10/646 , Y02T10/648 , Y02T10/7005 , Y10S56/15
摘要： An electric drive riding mower has a mobile main frame mounted on a pair of rearward drive wheels and steerable front wheels and a rotary mower unit suspended from the main frame between the front and rear wheels. The drive wheels are driven by a direct current motor through a belt drive and a change speed mechanical transmission, and the mower unit includes a pair of rotary blades respectively driven and directly connected to a pair of direct current motors. The traction and mower motors are connectible to a series of batteries carried on the main frame through an electric control system, which includes a main switch and a mower switch actuatable by the operator for controlling relays, which control the connection of the motors to the battery.
摘要翻译：电动牵引割草机具有安装在一对后驱动轮和可转向前轮上的可移动主框架以及从主框架悬挂在前后轮之间的旋转割草机单元。驱动轮由直流电动机通过皮带驱动和变速机械传动驱动，割草机单元包括分别驱动并直接连接到一对直流电动机的一对旋转叶片。牵引和割草机电机通过电气控制系统可连接到主机架上的一系列电池，该电控系统包括主开关和操作者可操作的用于控制继电器的割草机开关，该继电器控制电动机与电池的连接。

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