JPH0677837U - Centrifuge door lock mechanism - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an automatic door lock having the same operability as the conventional one, using an inexpensive and small DC solenoid. [Structure] A bar 16 of a solenoid is installed so as to be movable in the vertical direction, a convex portion 10 is provided on a door hook fixed to a door 3 ', and the inclination of the convex portion is utilized to pull in one direction by a spring 8'. Make the lock lever 14 rotatable,
When locked, the bar 16 of the solenoid falls under its own weight, making it impossible to rotationally move the lock lever 14. As a result, the suction force required by the solenoid is only the weight of the solenoid bar 16 and can be made small and inexpensive.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifuge having an automatic door lock mechanism.

[0002]

[Prior art]

 The conventional automatic door lock mechanism has a structure as shown in FIGS.

That is, a door hook 1 having a hook portion 2 such as a hole is fixed to a door 3. The lock bar holder 4 is fixed to the table 5 of the centrifuge, the lock bar 6 is mounted in the hole of the lock bar holder 4, and one end thereof is connected to the solenoid 7. The lock bar 6 is pressed by the spring 8 in the direction opposite to the arrow A.

When the power of the centrifuge is turned on, the solenoid 7 is energized and attracted, the lock bar 6 moves in the direction of the arrow A while pushing the spring 8, and the lock bar 6 separates from the hook 2 of the door hook 1 so that the door 3 Can be opened and closed. When the door 3 is closed and the rotating body 9 starts to rotate, the power of the solenoid 7 is cut off in response to the rotation signal, the lock bar 6 is moved in the direction opposite to the arrow A by the spring 8, and the hook portion 2 of the door hook 1 is moved. to go into. When the rotating body 9 stops, the stop signal is received and the solenoid 7 is attracted, so that the door 3 can be opened and closed.

[0005]

[Problems to be solved by the device]

 The conventional mechanism requires a strong solenoid to attract against the spring force and is expensive in price. When a relatively inexpensive AC solenoid is used, if the door is forcibly opened when the door is unlocked, the door hook will come into contact with the lock bar, and the lock bar will not move in the direction of arrow A even if the solenoid tries to suck the solenoid. Could lead to an accident.

A DC solenoid that is not susceptible to burnout has a weak attraction force, and therefore must be large in appearance and expensive in price.

An object of the present invention is to provide an automatic door lock having the same operability as conventional ones by using an inexpensive and small DC solenoid.

[0008]

[Means for Solving the Problems]

 The above object is achieved by changing the operation direction of the solenoid from the horizontal direction to the vertical direction, and utilizing the force of the bar of the solenoid dropping by its own weight.

[0009]

[Action]

 The door lock mechanism constructed by the above method is a door hook that has a convex portion and a concave portion that pull the lock lever in one direction with a weak spring to move the lock lever in the opposite direction when opening and closing the door. Install the solenoid vertically so that the solenoid bar that falls freely is located at one end of the lever.When the solenoid is not energized, the lock lever contacts the solenoid bar and the lock lever does not move. The solenoid bar is sucked and the lock lever can move.

[0010]

【Example】

 1 to 7 show an automatic door lock mechanism of the present invention.

The door hook 1 ′ fixed to the door 3 ′ has a shape having a convex portion 10 and a concave portion 11 as shown in FIG. 3, and the angle of the convex portion 10 is 90 degrees or more. The lock lever holder 12 and the table 5 ′ are fixed via a distancer 13 with a gap of δ. The gap δ is set to the thickness of the lock lever 14 plus about 0.5 mm so that the lock lever 14 can move about the fulcrum 15 in the direction of arrow B. The lock lever 14 is pulled by the spring 8'in the direction opposite to the arrow B. A solenoid 7'is vertically fixed to the bent portion of the lock lever holder 12 so that the solenoid bar 16 can move vertically. The lock lever 14 is bent into a Z shape and passes through the square hole 17 of the lock lever holder 12 so that the end face thereof is located at a position apart from the side face of the bar 16 of the solenoid by about 0.5 mm. The roll pin 18 is press-fitted into the hole at the tip of the solenoid bar 16, and one end of the roll pin 18 is passed through the long hole 19 of the lock lever holder 12 to serve as a stopper when the solenoid bar 16 falls freely.

When the power of the centrifuge is turned on, the solenoid 7'is energized, and the solenoid bar 16 is sucked upward. When the door 3'is closed in this state, the lock lever 14 rotates in the direction of arrow B around the fulcrum 15 by the convex portion 10 of the door hook 1'fixed to the door 3'to the concave portion 11 of the door hook 1 '. The door 3'is lowered, and the lock lever 14 is moved in the direction opposite to the arrow B by the force of the spring 8 '. When the rotating body 9 is rotated in this state, the solenoid 7'is de-energized in response to the rotation signal, the solenoid bar 16 falls by its own weight, and as shown in FIGS. Disable 14 in the direction of arrow B. If the lock lever 14 cannot move, the recess 11 of the door hook 1'is sandwiched between the square hole 20 of the lock lever holder 12 and the lock lever 14, and the door 3'cannot be opened. When the solenoid 7'is energized in response to the stop signal of the rotor 9, the solenoid bar 16 is attracted and the lock lever 14 moves in the direction of arrow B. When the door 3'is opened in this state, the lock lever 14 moves due to the inclination of the convex portion 10 'of the door hook 1'and the door 3'is opened.

[0013]

[Effect of device]

 With the automatic door lock mechanism according to the present invention, it is sufficient for the solenoid to have a force to suck the own weight of the solenoid bar, so a small and inexpensive DC solenoid can be used.

Further, since it is not necessary to use an AC solenoid because a weak suction force is sufficient, there is no fear of burning accident of solenoid.

In addition, by opening a small hole in the outer case at a position facing the roll pin, a thin rod, such as a screwdriver, can be inserted into the hole of the case from the outside to push the roll pin upward to open and close the door in the event of a power failure. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a door of an auto lock mechanism according to the present invention can be opened and closed.

FIG. 2 is a cross-sectional view showing a state in which the door of the auto lock mechanism according to the present invention can be opened and closed.

FIG. 3 is a view from below showing a state in which the door of the auto lock mechanism according to the present invention can be opened and closed.

FIG. 4 is a sectional view showing a state in which the door of the auto lock mechanism according to the present invention cannot be opened and closed.

FIG. 5 is a cross-sectional view showing a state in which the door of the auto lock mechanism according to the present invention cannot be opened and closed.

FIG. 6 is a view of the automatic lock mechanism according to the present invention from the bottom, showing a state in which the door cannot be opened and closed.

FIG. 7 is a perspective view of an auto lock mechanism according to the present invention.

FIG. 8 is a cross-sectional view showing the entire conventional centrifuge.

FIG. 9 is a cross-sectional view showing a conventional auto-lock mechanism.

[Explanation of symbols]

1 and 1'is a door hook, 2 is a hook part of a door hook, 3 and 3'is a door, 4 is a lock bar holder, 5 and 5'is a table, 6 is a lock bar, 7 and 7'is a solenoid, 8 and 8 ' Is a spring, 9 is a rotating body, 10 is a protrusion of a door hook, 11 is a recess of a door hook, 12 is a lock lever holder, 13 is a distancer, 14 is a lock lever, 15 is a fulcrum, 16 is a solenoid bar, and 17 is a lock lever. The holder is a square hole, 18 is a roll pin, 19 is a long hole of the lock lever holder, and 20 is a square hole of the lock lever holder.

Claims (1)

[Scope of utility model registration request] 1. A structure in which a hook is attached to the door after the centrifuge door is closed, and a lock lever and a lock device for fixing the lock lever by a solenoid are fixed to the centrifuge body, and the door hook has a convex portion. A direction in which the lock bar has a concave portion, the angle of the convex portion is 90 degrees or more, and the lock bar pressed by the contact of the convex portion of the door hook when the door hook is inserted into the lock device is attracted by the spring; A solenoid bar is provided at a position that can rotate in the opposite direction about its fulcrum and that prevents the lock lever from rotating within the maximum outer shape around the fulcrum of the lock lever. The door lock mechanism of the centrifuge, wherein the lock lever is rotatable when sucked, and is not rotatable when not sucked.