JPH0427721Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a cylinder lock for an ignition switch having a dustproof function.

<Prior art and its problems> Ignition switches for automobiles are generally placed around the steering shaft, but depending on the structure of the automobile, the end surface of the cylinder lock with the key insertion slot is almost always above the top. It may be installed in such a position that the

With this kind of structure, it is easy for dust to enter through the key insertion slot, but in the past, no special dust-proofing measures were taken, and dust could enter the inside of the cylinder inner and adversely affect the locking action of the cylinder lock. In addition, the rotary switch could reach the rotary switch, causing poor contact with the switch.

This invention was devised in view of these problems and aimed at providing a cylinder lock for an ignition switch that prevents dust from entering important parts such as the cylinder inner.

<Means for solving the problem> In order to achieve the above-mentioned purpose, in this invention,
A slide shutter is provided on the end face of the cylinder inner, which is supported by the cylinder inner so as to slide in the width direction of the key insertion slot to open and close the key insertion slot, and is biased in the direction of closing the key insertion slot. A cylinder cap having a key hole corresponding to the slide shutter is provided on the top surface of the slide shutter, and the key hole of this cylinder cap is provided at a position offset from the key insertion slot corresponding to the edge of the slide shutter in the closed state. A guide section for inserting the key is provided, and a dust reservoir is formed around the cylinder inner at a position lower than the end face of the cylinder inner, and the guide section is communicated with the outside through this dust reservoir when the key hole is closed. Equipped with a drain hole.

<Function> Since the cylinder lock of this invention is constructed as described above, the key insertion slot is covered with a slide shutter when no key is inserted, and almost no dust can enter. Since the dust on the top surface of the slide shutter is discharged from the guide section, dust hardly accumulates on the top surface of the slide shutter. When inserting the key, insert the key into the guide part formed in the key hole of the cylinder cap, and the edge of the slide shutter will be pushed by the key and slide to open the key insertion slot. It can be done without any trouble. Note that dust that has accumulated on the guide may fall inside, but since the guide is located at a position offset from the key insertion slot, it will not enter the inside of the cylinder inner and will fall onto the edge of the cylinder inner. It falls to areas lower than the surrounding area and collects in dust traps, and is naturally discharged from the dust exhaust hole due to vibrations of the car.

Therefore, almost no dust enters the inside of the cylinder from the key insertion opening, and almost perfect dustproof function is achieved.

<Example> Next, the illustrated embodiment will be described.

Figure 1 is a sectional view of the main parts, and Figures 4 and 5 are diagrams showing the overall appearance. 1 shows the ignition switch, which incorporates a cylinder lock, a rotary switch, a steering lock mechanism, etc. A key insertion part 2 is provided at the top, and a steering column attachment part 3 is provided at the side.
A rotary switch 4 is incorporated in the lower part.

In FIG. 1, 5 is a cylinder inner, and 6 is a cylinder outer, which are combined together to form a well-known cylinder lock. The cylinder inner 5 is provided with a key insertion opening 7 at a slightly raised center on its upper end surface, and a slide shutter 8 and a cylinder cap 9 for opening and closing the key insertion opening 7 are further provided on the end surface.

This slide shutter 8 is connected to the cylinder inner 5
It is supported between the cylinder cap 9 attached to the cylinder inner 5 so as to cover the end face of the cylinder inner 5, and the end face of the cylinder inner 5.As shown in FIG. It can be slid along the width direction of the key insertion slot 7, and is further biased in the direction of closing the key insertion slot 7 by a spring 10 compressed between the cylinder cap 9 and the cylinder cap 9. Therefore, when the key 11 is not inserted, the key insertion slot 7 is opened as shown in FIG.
is blocked. The cylinder cap 9 is provided with a key hole 12 in the center corresponding to the key insertion slot 7, and one side edge of the center part is further cut out in an approximately V-shape to close the key insertion slot 7. A guide portion 12a is formed in such a size that the end edge 8a of the slide shutter 8 can be seen from above when the slide shutter 8 is in this state.

Further, a dust hole 13 is formed around the end face of the cylinder inner 5 between it and the cylinder cap 9,
Furthermore, the cylinder outer 6 around the cylinder inner 5
A dust reservoir 14 is provided on the end face of the cylinder inner 5 by forming a recess so as to be lower than the end face of the cylinder inner 5. Dust discharge holes 15 and 15a are provided in the cylinder outer 6 and the body of the ignition switch 1, respectively, so that the dust reservoir 14 is communicated with the outside.

Note that 17 is a cap attached to the end face of the cylinder outer 6.

This embodiment is constructed as described above, and when inserting the key 11, first insert the tip of the key 11 into the guide portion 12a of the key hole 12 of the cylinder cap 9.
Insert into. As a result, the key 11 is guided by the edge of the inclined guide portion 12a, moves to the left in FIG. 2 while pressing the edge 8a of the slide shutter 8, and simultaneously opens the slide shutter 8 and automatically The key has reached a position where it can be inserted into the key hole 12, and insertion into the key insertion slot 7 is now possible. Also key 1
1 is removed, the slide shutter 8 is automatically returned by the biasing force of the spring 10, and the key insertion slot 7 is closed again.

Therefore, when the key 11 is not inserted,
The key insertion slot 7 is always closed by the slide shutter 8 to prevent dust from entering. Furthermore, when inserting the key 11, the slide shutter 8 automatically closes even if you do not particularly try to open the slide shutter 8. It can be opened and inserted without any problem. Further, even if dust enters from the gap between the cap 17 and the cylinder cap 9 or from the keyhole 12, most of it falls through the dust hole 13 into the dust reservoir 14, and is further removed from the dust discharge holes 15 and 15a. Therefore, dust hardly enters important parts inside the cylinder inner 5 through the key insertion opening 7.

FIG. 6 shows an embodiment in which the guide portion 12a of the keyhole 12 and the edge 8a of the slide shutter 8 are inclined downward to form a dome shape. The abutting portion with the edge 8a is shifted outward by a certain dimension A from the edge of the key insertion slot 7. Therefore, when the key 11 is inserted and the slide shutter 8 is opened, the dust accumulated here does not enter the key insertion opening 7 but falls outside, and does not enter the inside of the cylinder inner 5.

<Effects of the invention> As is clear from the above-mentioned embodiments, this invention provides a slide shutter on the end face of the cylinder inner that slides in the width direction of the key insertion slot to open and close the key insertion slot. A dust reservoir is provided around the cylinder inner at a position lower than the end face of the cylinder inner, and this dust reservoir is communicated with the outside through a dust discharge hole.

Therefore, in an ignition switch in which the end surface of the cylinder inner with a key insertion hole faces upward, it is rare for dust to enter the inside of the cylinder lock from the key insertion hole, and the dust that does enter is extremely important. It is discharged to the outside without reaching the inner part of the cylinder, and can enter the inside of the cylinder and have a negative effect on the locking action of the cylinder lock, and can even reach the rotary switch and cause poor contact with the switch. It is possible to prevent troubles that may occur. Further, since the slide shutter only needs to be slid a little in the width direction of the key insertion slot, it is advantageous in terms of space and has the advantage that it can be made compact.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a cross-sectional view of the main part, FIG. 2 is a front view of the key insertion part, FIGS. 3 a and b are operation explanatory views, and FIGS. FIG. 5 is a plan view and a side view showing the overall appearance, and FIG. 6 is a sectional view of a main part of another embodiment. 1...Ignition switch, 2...Key insertion part, 5...Cylinder inner, 6...Cylinder outer, 7...Key insertion slot, 8...Slide shutter, 8a...Slide shutter end Edge, 9...
Cylinder cap, 10... Spring, 11... Key, 12... Key hole, 12a... Guide part, 14
...Dust collection, 15, 15a...Dust discharge hole.

Claims (1)

[Claim for Utility Model Registration] In an ignition switch in which the end face of a cylinder inner with a key insertion slot is arranged upward, the cylinder inner is slid in the width direction of the key insertion slot to open and close the key insertion slot. A slide shutter supported and biased in the direction of closing the key insertion slot is provided on the end surface of the cylinder inner, a cylinder cap having a key hole corresponding to the key insertion slot is provided on the top surface of the slide shutter, and the cylinder A guide part for key insertion is provided in the key hole of the cap at a position offset from the key insertion slot corresponding to the edge of the slide shutter when it is in the closed state, and a guide part for key insertion is provided around the cylinder inner at a position that is lower than the end surface of the cylinder inner. A cylinder lock for an ignition switch, which is provided with a dust reservoir at a position and a dust discharge hole through which the guide portion communicates with the outside through the dust reservoir when the key hole is in the closed state.