Title:
DROP PREVENTING SENSOR
Document Type and Number:
Japanese Patent JPS5987510
Kind Code:
A
Abstract:
PURPOSE:To obtain a drop preventive sensor which is applicable onto an uneven floor, too, by constituting so that a supporting part for supporting a wheel so as to be movable downward vertically, and also the wheel can be moved upward by a radius portion or more. CONSTITUTION:A small wheel 42 is supported by a rotatable bush 43, can move upward and downward, and the bush 43 is always kept horizontally by a spring 44. A motion of a wheel is transmitted to an arm 45, and only when the tip of the arm is in a position of a photoswitch 46, the switch becomes off. Even if a wheel 42 encounters a large projecting part, it can be avoided by its movement in the upper direction and a rotation of the bush 43. Also, only when the wheel 42 falls downward vertically, the tip of the arm 45 closes up an air-gap of the switch 46, the switch is changed over, and danger of a drop of a main wheel is detected beforehand.
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Inventors:
ICHIKAWA YOSHIAKI
SADAKANE KENICHIROU
SATOU CHIKARA
TOMIZAWA FUMIO
SADAKANE KENICHIROU
SATOU CHIKARA
TOMIZAWA FUMIO
Application Number:
JP19757982A
Publication Date:
May 21, 1984
Filing Date:
November 12, 1982
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G05D1/02; G01B21/00; (IPC1-7): G01B21/00; G05D1/02
Attorney, Agent or Firm:
Akio Takahashi