Boots – shoes – and leggings
Patent
1989-09-27
1991-11-12
Lall, Parshotam S.
Boots, shoes, and leggings
36442407, 36442404, 318490, 180 651, 180 658, 307 91, G06F 770, B60K 100, B60L 100, G01R 3102
Patent
active
050653202
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a battery powered vehicle such as a forklift truck, and particularly, to a control and display system for a battery powered vehicle by which the operator can operate an electric control device built in the vehicle body to change the operational characteristic of the vehicle and to display data, such as respective setting values or parameters of the operational characteristic of the vehicle, a cumulative total of the hours operated by the vehicle, and a cumulative total of the distance travelled by the vehicle, on a display panel.
2. Background Art
Conventionally, forklift trucks, for example, are designed so that the operator can arbitrarily set parameters for controlling the characteristic of an acceleration during starting and running (hereafter called "travelling power") or parameters for cargo handling power, such as the tilt speed and lift speed of the forklift, according to the kind of cargoes handled and the operating conditions, since forklift trucks are used in various operating environment, handle various types of cargoes and are driven by operators having various degrees of skill.
FIGS. 14(a), (b) are schematic illustrations of a circuit for adjusting the travelling power and a cargo handling power, respectively, of a conventional type forklift truck. The travelling power is adjusted, as shown in FIG. 14a, by using a variable resistance 110 disposed on a control panel of the vehicle, and the cargo handling power is adjusted, as shown in FIG. 14(b), by using a plurality of trimmers 120 disposed on a control board. This adjustment by using trimmer disposed on the control board, however, is cumbersome and time consuming, since the control board is accommodated inside the vehicle body. Further, the trimmer system is inconvenient in that it is difficult for the operator to frequently adjust the system, even though such adjustments must be often made to obtain settings appropriate to the kind of work to be carried out and the degree of skill of the operator. The variable resistance for adjusting the travelling power is disposed in front of the operators seat and is easy to operate, but it is difficult to determine an exact acceleration value setting by using a scale of the variable resistance, and this causes problems for operators with a lower degree of skill. Also, it is difficult to make the variable resistance system watertight.
Therefore, the object of the present invention is to provide a control system for a battery powered vehicle by which an operator can easily, quickly and accurately adjust the travelling power and the cargo handling power, to settings appropriate for the current working conditions and degree of skill of the operator.
A vehicle such as a forklift truck is used for various types of work under various travelling or cargo handling operating conditions, and thus it is necessary to obtain operating data for each operating condition, such as the hours of operation by the vehicle to arrange the working hours and schedule maintenance for parts replacement and battery charging, etc.
Conventionally, industrial vehicles such as forklift trucks are equipped with hour meters which measure the hours of operation of batteries as a rough indication of hours of operation by the vehicle, but the conventional hour meter measures only the hours for which a key switch of the vehicle is in the ON state, namely, it measures only the ON time of the key switch. Consequently, the indications of the hour meter are the same for when the forklift is used for travelling or for cargo , and when the forklift is not used but the key switch is left in the ON state. In practice, these two conditions cause great difference in the electric consumption of the battery, wear of parts, and working volume, etc., and therefore, it is not appropriate to schedule maintenance or working hours on the basis of the indication of the hourmeter.
Therefore, another object of the present invention is to provide a display system which can measure the various hours
REFERENCES:
patent: 4258421 (1981-03-01), Juhasz et al.
patent: 4462079 (1984-07-01), Ito et al.
patent: 4612623 (1986-09-01), Bazarnik
patent: 4613939 (1986-09-01), Paine
patent: 4739482 (1988-04-01), Wrigge
Hayashi Takashi
Hida Junichi
Kurata Yoshikazu
Suga Kenji
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Lall Parshotam S.
Pipala E. J.
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