JPH0329498Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device in which a key insertion opening in a rotor cover is closed by a shutter plate biased by a torsion coil spring when a key is not inserted.

Conventionally, this type of lock device has been designed to be waterproof and dustproof for the key slot, and is suitable for parts exposed to rain and wind such as car door locks, fuel intake locks, trunk lid locks, etc. It is commonly used, and its structure is as shown in FIGS. 1 and 2, in which a keyed rotor 2 is rotatable relative to the rotor case 1 by inserting a key (not shown) into the rotor case 1. A rotor cover 4 is housed therein and has a key insertion opening 3 on the end face of the key rotor 2, and is held by a case cover 5. A shutter plate 6 is rotatably provided on the inner surface of the rotor cover 4, and a torsion coil spring 7 is stored in a spring storage portion 8 provided on the key rotor 2 on the inner surface of the shutter plate 6. , the torsion coil spring 7 has a rotation stopper 7a provided at the center thereof fitted into an engagement recess 8a provided in the spring storage portion 8, while both end portions 7b, 7
b is brought into contact with the inner surface of the shutter plate 6, thereby urging the shutter plate 6 to rotate in the direction of closing the key insertion opening 3 when the key is not inserted, and by inserting the key, the shutter plate 6 is is rotated inward to permit opening of the key insertion port 3.

In order to assemble the locking device having the above-mentioned conventional structure, first, the detent portion 7a of the torsion coil spring 7 is fitted into the engagement recess 8a of the spring storage portion 8, and the torsion coil spring 7 is inserted into the spring storage portion 8. Store it in. Then, store the shutter plate 6 by pressing it with your fingertips against the force of the torsion coil spring 7, and in this state, while pressing the shutter plate 6 with your fingertips, move the dummy key 9 to the key rotor 2 as shown in FIG.
The shutter plate 6 is held in a state where it is rotated inward against the biasing force of the torsion coil spring 7. After that, the end face of the key rotor 2 is covered with the rotor cover 4 by inserting the key insertion hole 3 into the dummy key 9, and then the key rotor 2 is inserted into the rotor case 1.
and cover the rotor cover 4 with the case cover 5. In this state, the peripheral edge of the case cover 5 is caulked and attached to the flange 1a of the rotor case 1 to integrate the whole, and then the dummy key 9 is inserted. Complete extraction work.

However, in the assembly work described above, since the biasing force of the torsion coil spring 7 acts when assembling the shutter plate 6, the worker presses the dummy key 9 while pressing the shutter plate 6 with his fingertips against the biasing force of the torsion coil spring 7. You have to plug it in,
It is difficult to automate the assembly with a machine, the assembly work is troublesome, and in addition to the step of inserting the dummy key 9, a step of caulking the peripheral edge of the case cover 5 and then removing the dummy key 9 is required, which increases the number of steps.
Overall, there was a problem of high manufacturing costs.

In order to solve the above problem, the applicant first applied for
An application has been filed for the invention No. 57-166440 (Utility Model Application No. 59-69371). As shown in FIGS. 4 to 8, the center part of the torsion coil spring 10 is bent into a U shape to form an engaging part 10a, and the engaging part 10a is formed on the outer peripheral part of the key rotor 11. When attaching the rotor cover 4 to the key rotor 11, as shown in FIG.
is released outward from the relief portion 12 to nullify the urging force on the shutter plate 6 to facilitate attachment of the rotor cover 4, and after the rotor cover 4 is attached, the engagement portion 10a is elastically deformed. While passing through the narrow slit-like relief portion 12 from the outside to the inside (see the two-dot chain line in Fig. 8), after passing, the engaging portion 10a is restored to a wider width by its own restoring force to engage the engagement. The portion 10a is engaged with the holding portion 13 formed inside the key rotor 11 as shown by the solid line in FIG. It is rotated in the direction of closing.

However, in the above configuration, the engaging portion 10a of the torsion coil spring 10 is connected to the key rotor 1.
When pushing in the direction of arrow A as shown in FIG. 8 in order to pass through the relief part 12 of No. 1, both sides 10c of the engagement part 10a are simultaneously pushed inward by the opposing inner side surfaces of the relief part 12. Since they are elastically deformed, both sides 10c and 10c come into contact with each other and the elastic deformation is prevented, resulting in a state as if a wedge had been driven into the narrow relief portion 12, so that the engagement A large pushing force is required for the part 10a, making it difficult to push in, and the large pushing force may cause permanent deformation of both sides 10c of the engaging part 10a, resulting in insufficient engagement with the holding part 13. Therefore, when the torsion coil spring 10 is automatically assembled using an assembly machine, an unresolved problem arises in that the reliability of the assembly is lowered.

This idea was made in view of the above circumstances.
The purpose is to prevent the biasing force of the torsion coil spring from acting on the shutter plate when attaching the shutter plate and rotor cover to the key rotor, and to allow the biasing force of the torsion coil spring to be applied to the shutter plate after the rotor cover is attached. When the engaging part of the torsion coil spring is pressed into engagement with the holding part of the key rotor through the narrow relief part, the torsion coil spring can be pushed in with a small pushing force, and the torsion coil spring is permanently deformed. It is an object of the present invention to provide a locking device that can prevent the above problems and improve assembly workability by automating assembly while ensuring reliability of assembly.

The first embodiment of the present invention is shown in Figs. 9 to 12 below.
This will be explained with reference to the figures. Reference numeral 21 denotes a cylindrical rotor case, and one end thereof is provided with a large-diameter hole 22 having rotation regulating step portions 22a, 22a on the inner circumference side, and a flange portion 23 on the outer circumference side. Reference numeral 24 denotes a key rotor housed in the rotor case 21. A key insertion hole 25 is formed in the axial center of the key rotor, and a convex portion 26 and a large diameter portion are formed on the outer periphery of the key rotor 24 on the open end side of the key insertion hole 25. A portion 27 and a flange portion 27a are formed in this order, and the convex portion 26
is located between the rotation regulating step portions 22a and 22a, and the large diameter portion 27 and the collar portion 27a are located in the large diameter hole portion 2.
2. The key rotor 24 is provided with a locking mechanism (both not shown) consisting of a well-known locking mechanism that allows rotation relative to the rotor case 21 by inserting a key (not shown) and a spring that biases the locking mechanism. . When the key is inserted, the key rotor 24 is inserted into the convex portion 2.
6 can rotate within a range restricted by the rotation restriction step portions 22a, 22a. Reference numeral 28 denotes a rotor cover having a key insertion opening 29, and elastic claws 30, 30 are formed on the peripheral edge of the rotor cover 28, oriented substantially at right angles to the rotor cover 28. On the other hand, the flange 27a of the key rotor 24 is provided with grooves 27b, 27b into which the elastic claws 30, 30 of the rotor cover 28 are fitted. Reference numeral 31 denotes a rectangular shutter plate having shaft portions 32, 32 at both left and right corners, and this shutter plate 31 has both shaft portions 32, 32 rotated into shaft support recesses 33, 33 provided at the end surface of the key rotor 24, respectively. It is inserted so that it can be moved. 34 is a spring storage section provided on the end surface of the key rotor 24, and 35 is a spring storage section 34.
This is a torsion coil spring housed in a torsion coil spring, which has an engaging part 35a formed by bending the center part into a U-shape, and both ends which are working pieces extending from the rotation fulcrum which is the coil part. Parts 35b, 35b
is directed toward the front end of the key insertion hole 25 of the key rotor 24 so that it can come into contact with the inner surface of the shutter plate 31. Reference numeral 36 denotes a slit-like relief part formed in the center of the spring storage part 34, and side faces 36a, 3 facing each other form a parallel passage.
The width between the torsion coil springs 6b and 6b is slightly smaller than the width between the engaging portions 35a of the torsion coil spring 35. 37 are opposite sides 36 of the relief part 36
This is a holding portion formed at the inner part of the holding portions a and 36b, and the width thereof is larger than the width of the relief portion 36. In FIG. 11, reference numerals 38 and 39 denote a pair of first and second inclined guide surfaces formed to form an expanding passage at the inlet of the relief portion 36, and the engaging portion 35a of the torsion coil spring 35 is connected to the relief portion. It is designed to be guided to a holding part 37 via a holder 36 . Of these, the first inclined guide surface section 38 extends from the inlet section 36c of one side surface 36a of the relief section 36 to the side surface 36.
The second inclined guide surface portion 39 is formed to expand outward to form an angle A with respect to a, and the second inclined guide surface portion 39 extends from the entrance portion 36d of the other side surface 36b of the relief portion 36 at an angle A with respect to the side surface 36b. It is formed to expand outward so as to form an angle B different from A. Thus, the entrance portions 36c and 36d of the relief portion 36, that is, the inner end portions of the first and second inclined guide surface portions 38 and 39 have a step H in the inner and outer directions of the key rotor 24. As a result, the shapes of the opposing surfaces of the passages of the relief section 36, which are composed of a parallel passage and a widened passage, become asymmetrical. Reference numeral 40 denotes a case cover having a circular hole 40a in the center, and the key rotor 24, torsion coil spring 35, shutter plate 31, and rotor cover 28 can be attached to the key rotor 24, the torsion coil spring 35, the shutter plate 31, and the rotor cover 28 by caulking the peripheral edge to the flange 23 of the rotor case 21. This is to maintain the assembly in a predetermined state.

To assemble the lock device having the above configuration, first, the torsion coil spring 35 is placed in the spring storage part 34 with the engaging part 35a of the torsion coil spring 35 protruding from the release part 36 to the side of the key rotor 24. Store it (see Figure 12a). Then, the shaft parts 32, 32 of the shutter plate 31 are connected to the shaft support recesses 33, 33, respectively.
The shutter plate 31 is placed on both ends 35b, 35b of the torsion coil spring 35 while being fitted therein. Then, the engaging portion 3 of the torsion coil spring 35
5a is released and the biasing force on the shutter plate 31 is nullified, so the shutter plate 31 placed on both ends 35b, 35b of the torsion coil spring 35 as described above rotates downward due to its own weight. (See Figure 12b). After that, the elastic claws 30, 30 of the rotor cover 28 are attached to the flange 2 of the key rotor 24, respectively.
The rotor cover 28 is pushed toward the key rotor 24 by inserting it into the grooves 27b, 27b of 7a, and the tips of the elastic claws 30, 30 are elastically engaged with the flange 27a. In this way, the rotor cover 28
is attached to the end face of the key rotor 24. Thereafter, the engaging portion 35a of the torsion coil spring 35 is moved in the direction of arrow C along the first and second inclined guide surfaces 38 and 39 as shown in FIG. 11 against the elastic force of the torsion coil spring 35. A U-shaped extending piece 3 that is pressed and extended from the pivot point of the torsion coil spring 35
Relief part 3 while deforming 5c, 35c inward
Pass 6. In this process, the lines 35c and 35c are pushed along the first and second inclined guide surfaces 38 and 39 having different angles, so the strains and stresses generated in each line are different, so the two lines are shown in FIG. As shown by the dashed dotted line, they are in a twisted state and their relative positions shift in the inner and outer directions, and they pass through the relief portion 36 in a vertical line. When the engaging portion 35a of the torsion coil spring 35 passes through the relief portion 36 and retreats into the key rotor 24, the wires 35c, 35c are restored and engaged with the holding portion 37 (see Fig. 12c), and the torsion coil spring 35 is in the non-released state, and the urging force to the shutter plate 31 becomes effective, and the shutter plate 31
are both ends 35b, 35b of the torsion coil spring 35.
The key insertion port 29 is rotated and biased in the direction of closing the key insertion port 29. Then, the key insertion port 29 is connected to the shutter plate 3.
1, the biasing force of the torsion coil spring 35 is applied to the rotor cover 2 via the shutter plate 31.
8, the rotor cover 28 remains engaged with the end surface of the key rotor 24 against the urging force of the torsion coil spring 35 by the elastic claws 30, 30. Next, the key rotor 24 is inserted into the rotor case 21, and finally, the case cover 40 is placed over the rotor cover 28, and its peripheral portion is caulked to the flange portion 23 of the rotor case 21 to complete the assembly work.

As described above, according to this embodiment, the key rotor 24
The engaging portion 3 of the torsion coil spring 35 is provided until the attachment of the rotor cover 28 is completed.
5a is in the released state to nullify the urging force on the shutter plate 31, so when attaching the rotor cover 28 to the key rotor 24, the shutter plate 31
The biasing force of the torsion coil spring 35 does not act on the shutter plate 6, and therefore the shutter plate 6 is not blown outward by the biasing force of the torsion coil spring 7 unlike in the conventional structure. Inserting the dummy key 9 into the key rotor 2 while holding it with your fingertips eliminates the need for the troublesome work and improves assembly workability. The relief portion 3 is guided by a pair of first and second inclined guide surface portions 38 and 39 whose end portions have a step H in the inner and outer directions.
6, the engaging portion 35a of the torsion coil spring 35 can be easily engaged with the holding portion 37 with a small pushing force, and deformation of the engaging portion 35a can be prevented.

FIG. 13 shows a second embodiment of the present invention, in which the same parts as in the above embodiment are given the same reference numerals, and only the different parts will be explained. Reference numeral 41 denotes a relief portion, and each inlet portion 41 of the opposing side surfaces 41a and 41b
c and 41d are at the same position with respect to the inner and outer directions of the key rotor 24, and are located at the same position with respect to the inner and outer directions of the key rotor 24, and
8 and 39 expand outward at different angles A and B, respectively. FIG. 14 shows a third embodiment of the present invention, in which the first and second inclined guide surfaces 38 and 42 are opened at the same opening angle from the inlet parts 36c and 36d, which have a step H in the inner and outer directions of the relief part 36. It is expanded outward at A. The same effects as in the first embodiment can be obtained in the second and third embodiments as well.

As is clear from the above description, the present invention provides a relief part on the outer periphery of the key rotor, and has different opening angles at the inlet parts of the opposing faces of the relief part, or has a step in the inner and outer directions at the rear end. Since a pair of inclined guide surface portions having a shape of 100 mm is provided, the biasing force of the torsion coil spring is not applied to the shutter plate when the rotor cover is attached to the key rotor, and the biasing force of the torsion coil spring is not applied to the shutter plate after the rotor cover is attached. Furthermore, since the torsion coil spring can be pushed in with a small pushing force and the torsion coil spring can be reliably prevented from being permanently deformed, it is possible to improve assembly work while ensuring assembly reliability. This effect is achieved.

[Brief explanation of the drawing]

Figures 1 to 8 show the conventional structure; Figure 1 is a longitudinal sectional view, Figure 2 is an exploded perspective view, Figure 3 is a longitudinal sectional view for explaining the assembly procedure, and Figure 4 is a longitudinal sectional view. FIG. 5 is an exploded perspective view, FIG. 6 is a side view of the key rotor, FIG. 7 is a vertical side view for explaining the assembly process, and FIG. 8 is an enlarged cross section taken along the line - in FIG. 7. 9 to 12 show the first embodiment of the present invention, in which FIG. 9 is a longitudinal sectional side view, FIG. 10 is an exploded perspective view, and FIG.
FIGS. 12A to 12C are longitudinal sectional side views showing the assembly procedure; FIGS. 13 and 14 are FIGS. 11 and 11 showing the second and third embodiments of the present invention; This is a corresponding diagram. In the drawing, 21 is a rotor case, 24 is a key rotor, 28 is a rotor cover, 29 is a key insertion slot, 3
1 is a shutter plate, 35 is a torsion coil spring, 35
a is an engaging part, 36, 41 is a release part, 36a, 3
6b is a side part (opposing surface), 36c, 36d, 41
c, 41d are inlet parts, 37 are holding parts, 38 are first
The inclined guide surface portions 39 and 42 indicate the second inclined guide surface portions.

Claims (1)

[Scope of utility model registration request] a rotor case, a key rotor having a substantially slit-shaped relief part opened in the inner and outer directions formed in a part of the peripheral wall and inserted into the rotor case so as to be rotated by an inserted key; a rotor cover having a key insertion hole attached to an end surface; a shutter plate located inside the rotor cover and rotatably provided on the key rotor for opening and closing the key insertion hole; an operating piece portion which is rotatably disposed on the key rotor, extends from its rotational fulcrum, contacts the shutter plate, and biases the shutter plate to rotate in a direction to close the key insertion slot; and the operating piece; a torsion coil spring having a generally U-shaped extension piece extending in a direction different from the direction of the shutter plate; In the released state in which the extending piece portion is elastically deformed and passed through the relief portion outwardly, it is substantially disabled, and is caused to pass through the relief portion from the outside to the inside, retreat into the key rotor, and remain at that position. In the locking device, which is activated in an engaged and non-released state, a passage through which the extending piece of the relief part passes is formed in a shape in which a parallel passage and a widening passage are continuous from the inside to the outside of the key rotor. In addition, the locking device is characterized in that the shape of the opposing surface of the passage is asymmetrical.