JPH0542210Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric lock, and particularly to a drive device for moving a dead bolt of a locking device provided on a door forward and backward for locking or unlocking.

[Conventional technology]

A locking device installed on a door through which people enter and exit, such as an entrance, usually has a so-called latch bolt for temporary tightening, and a so-called dead bolt for final tightening in addition to the latch bolt.

To temporarily tighten the latch bolt, operate the rotatable knob provided on the door to retreat the latch bolt into the space formed in the door.
The door can be opened and closed.

On the other hand, the dead bolt can be moved in the locking or unlocking direction by rotating the thumb turn provided on the inside of the door, and can be similarly moved from the outside by operating the cylinder lock key. can.

Among the above-mentioned lock devices, it is known that a thumb-turn shaft driving device that combines a motor and a reduction gear train is attached to form an electric lock as shown in FIGS. 6 and 7. In the figure, a thumbturn shaft 2 has a connecting portion 3 connected to a cam for driving a dead bolt at its tip, and a thumbturn 1 fixedly attached to its rear end. On the other hand, a reduction gear train 9 is connected to the motor shaft 8' of the motor 8, and meshes with a gear 17 fixed to the thumbturn shaft attached to the thumbturn shaft 2. The thumb turn shaft 2 has a notched flat surface 2c, and a limit switch 16 is provided opposite to this, and a movable element of the limit switch is in contact with the flat surface 2c. Reference numeral 12 is a connector connected to a power source.

When the switch installed in the remote part is operated and the power is turned on, the motor 8, which rotates forward or reverse, rotates, rotating the gear 17 via the reduction gear train, and at the same time, the thumb turn shaft 8 also rotates to lock the lock. Unlock it. When the thumb turn shaft 8 rotates and reaches a predetermined position, the mover 16' of the limit switch 16 detects this and issues a command to the motor 8 to stop.

[Problem that the invention attempts to solve]

However, in the electric lock having the above configuration, even if a stop command is issued from the limit switch 16, the motor 8 continues to rotate due to inertia. Therefore,
This has the disadvantage that unnecessary force or impact is applied to the surrounding members such as the dead bolt, the dead bolt drive cam, the connecting portion 3 with the cam, and the motor 8, resulting in damage to these members.

The present invention aims to eliminate the above-mentioned drawbacks of the prior art.In electric locks that use a motor, even if the motor cannot stop immediately after receiving an instruction to stop, there is no possibility of damaging surrounding components. The aim is to provide an electric lock that does not require an electric lock.

[Means for solving problems]

In order to achieve the above object, the present invention includes a thumb turn shaft having a connection part with a dead bolt drive cam at one end and a thumb turn attached to the other end; a protrusion formed in the middle of the thumb turn shaft; a ratchet holding member having a groove into which the protrusion is fitted, and rotating the thumb turn shaft in the locking and unlocking directions by reciprocating; a base portion rotatably supported by the ratchet holding member; The tip is urged in the direction of expansion and pressed into a fixed position by the ratchet, which faces each other at a predetermined distance, and is connected to the motor via a reduction gear train, allowing circular motion in both forward and reverse directions. and a drive pin that rotates one ratchet against a spring, fits into the gap between the ratchets, presses the other ratchet, and moves the ratchet holding member.

[Effect]

The operation of the present invention will be explained with reference to FIGS. 2 to 5. In these figures, a is a sectional view of the electric lock driving device, and b is a front view from the thumb turn side. In FIG. 2, when a locking instruction is given, the motor rotates and the drive pin 10, which is connected to the motor through a reduction gear train, rotates in the direction of the arrow in the figure. When it comes into contact with the back surface of the ratchet 7 on the left side of the figure, it rotates that ratchet against the spring, retracts the ratchet, and then enters between the ratchets 7 and 7, as shown in Figure 3a. It comes into contact with the ratchet 7 on the right side of the figure and is pressed by the rotation of the motor, moving the ratchet holding member 6 to the right in the figure to the state shown in FIG. 4a. Once it is locked, slip past the corner of the ratchet on the right side of the diagram and escape through the gap between the ratchets. At this position, it receives a stop signal, but due to the inertia of the motor, it continues to move in a circular motion, and if the inertia is large, it will make one more turn as shown in Figure 5a. However, after rotating the left ratchet 7 against the spring 7b and retracting it, the ratchet 7 approaches the right ratchet.
As shown in FIG.
No matter how much the ratchet holding member 6 continues to move circularly due to inertia, the ratchet holding member 6 cannot be moved, and there is no fear of damaging other members. To unlock it, do the opposite of the above.

〔Example〕

Next, embodiments of the present invention will be described.

Fig. 1a is a longitudinal sectional view of an electric lock driving device A showing one embodiment of the present invention, Fig. 1b is a partial view of the locking device B, and Figs. 2 to 5 are each stage of locking. , in which a is a cross-sectional view and b is a diagram showing the position of the thumb turn. In these figures, a connecting portion 3 is formed at the tip of the thumbturn shaft 2 and can be fitted into a connecting hole 15 of a cam 14 that drives a dead bolt 13. A thumb turn 1 is fixed to the rear end of the thumb turn shaft 2, and when an electric lock is attached, it is attached so as to be located on the indoor side, so that it can be manually locked and unlocked from inside the room. A notch 4 is formed in the middle of the thumb turn shaft 2, and a protrusion 5 is formed in the notch 4 parallel to the axis. There is a ratchet holding member 6 that can be fitted into the notch 4, and has a groove 6a formed therein into which the above-mentioned protrusion fits. The ratchet holding member 6 has a hollow rectangular parallelepiped shape, and a pair of ratchets 7,
7 is pivotally supported at its base by a shaft 7a. Further, the latches 7, 7 are urged in a direction in which both ends of the latches 7 are expanded by the spring 7b, and are prevented from rotating by a latchet locking portion 6b provided on the latchet holding member 6. A gap is provided between the ratchets 7, 7 so that a drive pin 10, which will be described next, can be inserted therein.

The drive pin 10 is eccentrically fixed to a drive plate 11, and the drive plate 11 is connected to the motor 8 via a reduction gear train 9.
It is connected to the. Therefore, when the motor 8 rotates, the drive pin 10 moves in a circular motion.

The ratchets 7, 7 are one-way clutches with opposite directions, and the opposing surfaces are provided approximately parallel to each other with a gap between them, and the back side is a slope, so that when the drive pin 10 comes into contact with it from the back side. , Figure 5a
As shown, it has a shape that allows it to easily rotate against the spring 7b. By the way, if the spring 7b is too strong, a large load may be applied to the ratchet holding member 6 and the drive pin 10, so it is better to make the spring 7b as weak as possible so that the ratchet 7 can be locked to the locking portion 6b.

Further, the length of the ratchet 7 is such that it comes out of contact with the drive pin 10 at the position where unlocking or locking is completed.

Note that the shaft of the notch 4 has a fan-shaped cross section, and the fan-shaped ends 2a and 2b abut against the ratchet holding member 6 after locking and unlocking, thereby preventing the ratchet holding member 6 from overrunning. is prevented.

Note that the notch portion may not be provided, and the protrusion portion 5 and the groove 6a may be in a relationship like the dead bolt and drive cam shown in FIG. 1B.

[Effect of idea]

As explained above, according to the present invention, in an electric lock, a protrusion is formed in the middle of the thumbturn shaft, the ratchet has a groove into which the protrusion fits, and rotates the thumbturn shaft by reciprocating. The holding member and the ratchet, which is biased by a spring and pressed into a fixed position, and which face each other while maintaining a predetermined distance, move in a circular direction in both forward and reverse directions, and one ratchet is moved against the spring. The drive pin rotates, fits into the gap between the ratchets, presses the other ratchet, and moves the ratchet holding member.
No overload is applied to the motor, improving the durability of the motor. Further, there is an effect that no extra force or impact is applied to other members, and damage to these members can also be prevented.

[Brief explanation of the drawing]

Figure 1 a is a longitudinal cross-sectional view of the electric lock drive device, b is a cross-sectional view of the main parts of the same lock device, and Figures 2 to 5 show the drive device in Figure 1 from the start to the end of locking. In the figures, a is a sectional view taken along the line C-C in FIG. 1, b is a sectional view taken as seen from D in FIG. 1, and FIG.
FIG. 7 is a sectional view taken along line E--E in FIG. 6. DESCRIPTION OF SYMBOLS 1...Thumb turn, 2...Thumb turn shaft, 3...Connection part, 5...Protrusion part, 6...Ratchet holding member, 6a...Concave groove, 7...Ratchet, 7a...Ratchet shaft, 7b... Spring, 8...
...Motor, 9...Reduction gear train, 10...Drive pin, 13...Dead bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] A thumbturn shaft having a connection part with a dead bolt drive cam at one end and a thumbturn attached to the other end, a projection formed in the middle of the thumbturn shaft, and a projection into which the projection is fitted. a ratchet holding member having a concave groove and rotating the thumb turn shaft in the locking and unlocking directions by reciprocating; a base portion rotatably supported by the ratchet holding member; The parts are biased in the direction of expansion and pressed into a fixed position, and are connected to a motor through a reduction gear train and a ratchet that faces each other at a predetermined distance, making circular motion in both forward and reverse directions. An electric lock comprising a drive pin which rotates one ratchet against a spring, fits into a gap between the two ratchets, presses the other ratchet, and moves the ratchet holding member.