JPS63198395U

JPS63198395U -

Info

Publication number: JPS63198395U
Application number: JP1987088609U
Authority: JP
Priority date: 1987-06-10
Filing date: 1987-06-10
Publication date: 1988-12-21

Description

[Brief explanation of the drawing]

第１図Ａ，Ｂ及びＣは本考案一実施例の主要構
成とその動作を説明するための部分拡大正面図、
第２図Ａ，Ｂは該実施例における直流モータの制
御を説明するための回路図、第３図は本考案の変
形例として交流モータを制御するための回路図、
第４図は従来の電動リニアアクチエータの概略構
成を示す一部破断断面図であり、第５図Ａ，Ｂは
第４図の電動リニアアクチエータを応用した電動
ベツドの概略構成及び動作を説明するための正面
図及び斜視図である。１……直流モータ、２……減速機部、３……推
進軸、４……雄ねじ、５……雌ねじ、６……ロツ
ド、７……シリンダー、８，９……取付部、１０
……電動アクチエータ、１１……背もたれ部、１
２……リンク、１３……長孔、１４……ピン、１
５……リミツトスイツチ、１６……操作スイツチ
、１７……リレー、１８……タイマ、１９……直
流電源、２０……交流電源、２１……交流モータ
、ＭＣ１〜ＭＣ７……リレー接点。 FIGS. 1A, B, and C are partially enlarged front views for explaining the main structure and operation of an embodiment of the present invention;
2A and 2B are circuit diagrams for explaining the control of the DC motor in this embodiment, and FIG. 3 is a circuit diagram for controlling the AC motor as a modification of the present invention.
FIG. 4 is a partially cutaway sectional view showing the schematic structure of a conventional electric linear actuator, and FIGS. 5A and 5B explain the schematic structure and operation of an electric bed to which the electric linear actuator of FIG. 4 is applied. FIG. 2 is a front view and a perspective view. 1...DC motor, 2...Reducer section, 3...Propulsion shaft, 4...Male thread, 5...Female thread, 6...Rod, 7...Cylinder, 8, 9...Mounting part, 10
...Electric actuator, 11...Backrest portion, 1
2... Link, 13... Long hole, 14... Pin, 1
5... Limit switch, 16... Operation switch, 17... Relay, 18... Timer, 19... DC power supply, 20... AC power supply, 21... AC motor, MC1 to MC7... Relay contact.

Claims

[Claims for Utility Model Registration] (1) A safety mechanism for an electric linear actuator that moves a rod forward or backward by driving a propulsion shaft having a male screw with a motor, which is driven by the electric linear actuator. A pin provided at the tip of the rod is accommodated in a long hole provided on the side of the driven object, and is at a predetermined position in the long hole during normal operation of the driven object. The pin is provided with a switch that detects the movement of the pin moving within the elongated hole when an abnormal state occurs in the driven object, and when the switch is turned on, reverses the current flowing to the motor; A safety mechanism for an electric linear actuator, characterized in that the driven object is automatically returned to the state before the abnormality occurred. (2) In paragraph 1 of the claims for utility model registration,
A safety mechanism for an electric linear actuator, wherein the reversal of the motor current is performed by switching a relay contact activated by an ON operation of the switch. (3) Utility model registration Claims 1 or 2, wherein a timer is provided that starts operation when the switch is turned on, and the reversal of the motor current is caused by the operation of the timer. A safety mechanism for an electric linear actuator that automatically stops after a preset time. (4) The safety mechanism for an electric linear actuator according to claim 1, 2, or 3 of the utility model registration claim, characterized in that the power source for driving the motor is a DC power source. (5) The safety mechanism for an electric linear actuator according to claim 1, 2, or 3 of the utility model registration claim, characterized in that the power source for driving the motor is a direct current.