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In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a dead bolt, and has a spindle coupling plate sleeved non-rotatably thereon, and a gear plate unit sleeved rotatably thereon. The spindle coupling plate is provided with a ball member which is biased to

In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a dead bolt, and has a spindle coupling plate sleeved non-rotatably thereon, and a gear plate unit sleeved rotatably thereon. The spindle coupling plate is provided with a ball member which is biased to project from the spindle coupling plate and engage one of a plurality of angularly displaced ball recesses formed in the gear plate unit. An electric driving motor has a transmission shaft engaging the gear plate unit. The ball member disengages the spindle coupling plate from the gear plate unit when the rotary knob is operated to rotate the spindle and the spindle coupling plate. The motor is operable to rotate the gear plate unit which rotates the spindle coupling plate by virtue of the engagement between the ball member and the ball recesses, thereby resulting in co-rotation of the spindle.

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In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a dead bolt, and has a spindle coupling plate sleeved non-rotatably thereon, and a gear plate unit sleeved rotatably thereon. The spindle coupling plate is provided with a ball member which is biased to

In an electric door lock, a spindle with a manually operable rotary knob is connected operably to a dead bolt, and has a spindle coupling plate sleeved non-rotatably thereon, and a gear plate unit sleeved rotatably thereon. The spindle coupling plate is provided with a ball member which is biased to project from the spindle coupling plate and engage one of a plurality of angularly displaced ball recesses formed in the gear plate unit. An electric driving motor has a transmission shaft engaging the gear plate unit. The ball member disengages the spindle coupling plate from the gear plate unit when the rotary knob is operated to rotate the spindle and the spindle coupling plate. The motor is operable to rotate the gear plate unit which rotates the spindle coupling plate by virtue of the engagement between the ball member and the ball recesses, thereby resulting in co-rotation of the spindle. d on a surface of said support member on the side where the support member is cantilevered by said holder, said electronic circuit section is sealed within said holder. 15. A thermal air flow sensor having a thermal element for measuring the air flow flowing through an intake passage, the thermal air flow measuring element having a heating resistor and being disposed within the intake passage, wherein an intake air temperature sensing element is provided for sensing air temperature in the intake passage, said intake air temperature sensing element and said air flow measuring element are respectively mounted in recesses formed each individually in a support member, are positioned within the intake passage and are electrically connected respectively to conductors disposed on the support member, and the resulting electric connections are sealed with resin.