KR940010613B1 - Watch for use as pendant or wristwatch - Google Patents

Abstract

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Description

Vehicle-mounted watch

1 to 6 show an embodiment of the present invention, Figure 1 is a partial side cross-sectional view of the minute hand shaft,

2 is a side cross-sectional view of the minute hand,

Top view of the 3rd minute hand,

4 is a partial side cross-sectional view of the hour hand shaft,

5 is a side cross-sectional view of the hour hand,

6th top view of the hour hand,

7 and 8 illustrate another embodiment of the present invention, and FIG. 7 is a plan view of the minute hand,

8th top view of the hour hand,

9 is a side cross-sectional view of a needle portion of a conventional vehicle-mounted watch,

10 is a perspective view of a conventional minute hand,

11 is a partial plan view of a conventional minute hand portion.

* Explanation of symbols for main parts of the drawings

1: Second hand drive shaft 2: Minute hand shaft

3: hour hand axis 4: second hand

5: minute hand 6: hour hand

7,8,9: boss portion 10,11,12: fitting hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted watch, and more particularly to a vehicle-mounted zero watch suitable for a tachograph.

Background Art [0002] A driving recorder has conventionally been known for managing the driving state of a vehicle so as to record the speed, the number of revolutions, and the like according to the actual time on a chart ground which rotates by a clock mechanism.

9 shows a conventional vehicle-mounted clock used for such a tachograph, and the minute hand shaft 2 and the hour hand shaft on the hollow pipe are located outside the second hand drive shaft 1 that rotates according to the driving force in a driving unit (not shown). 3) are arranged on the sequential coaxial axis, and the outer circumference of each of the second hand drive shaft 1, the minute hand shaft 2, and the clock shaft 3 is made of a resin second hand 4, minute hand 5, and hour hand ( The needles are fitted into the fitting holes 10, 11, and 12 formed in the bosses 7, 8, and 9 of 6, respectively, so that the needles are coaxially attached. It is supposed to be.

In addition, interlocking portions 13 and 14 are provided at each proximal end of the minute hand shaft 2 and the hour hand shaft 3 to transfer the driving force from the driving unit (not shown) to the respective shafts. The axis is rotated to display a predetermined time.

Here, the minute hand shaft 2, its engagement portion, and the hour hand shaft 3 and its engagement portion 14 are each integrally formed of resin in order to reduce the number of parts and lower the unit cost.

In the vehicle-mounted watch, in order to keep the second hand 4, the minute hand 5, and the hour hand 6 at the ends of the respective shafts, conventional fitting holes of the respective shafts (as shown in FIGS. 10 and 11) 10, 11, and 12 are formed, for example, as an octagonal polygonal shape, and accordingly, thick portions 7a in the bosses 7, 8, and 9 of each needle, respectively. Are alternately formed in the circumferential direction of the thinner portions 7b, 8b, and 9b.

Since the thin parts 7b, 8b, and 9b are deformed so as to extend during extrapolation of each of the bosses 7, 8, and 9 into the respective axes, a predetermined pressing force is applied. The second hand 4, the minute hand 5 and the hour hand 6 can be press-fitted, and the second hand drive shaft 1 and the minute hand shaft 2 are formed by the thick portions 7a, 8a and 9a. ) And a predetermined holding force for the hour hand axis 3.

However, since the second hand 4, the minute hand 5, and the hour hand 6 are coaxially arranged in the conventional vehicle-mounted watch as described above, it is desirable to improve the appearance without forming the center portion of the needle too large. The bosses 7, 8, 9, the minute hand shaft 2, and the hour hand shaft 3 of each hand cannot be sufficiently thick, so the second hand 4, the minute hand 5, and the hour hand ( 6) It is not possible to provide sufficient holding force, and since each of the above components is made of a resin material, the holding force of each of the needles 4, 5 and 6 decreases depending on the environmental conditions such as temperature. There may be a case.

The above structure secures a fitting holding force that can withstand practically enough, but is not preferable for safety reasons.

In addition, in the minute hand 5 located between the second hand 4 and the hour hand 6, the boss portion 8 and the minute hand shaft 2 cannot be thinned due to the structure thereof, which is particularly troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the present invention is to provide a vehicle-mounted watch which can reliably prevent the occurrence of needle misalignment under any environmental conditions and further increase safety.

In order to achieve the above object, the vehicle-mounted watch according to the present invention is made of a resin formed on an outer side of the second hand drive shaft, the engaging portion in which the driving force from the driving portion is transmitted to the base end is transferred to the outside of the base end. The minute hand shaft and the hour hand shaft on the pipe are arranged coaxially, and the periphery of each tip end of the hour hand shaft, the minute hand shaft and the second hand drive shaft is fitted to a fitting hole formed by a resin clock minute hand and a second hand, respectively. In this case, at least a serration portion engaged with each other is formed on the outer periphery of the tip of the minute hand shaft and the inner periphery of the fitting hole of the minute hand.

The serration portion may be provided at the entire circumference of the inner circumference of the fitting hole or may be provided only at a portion of the inner circumference.

According to the present invention, since the serrations are engaged with each other on at least the outer periphery of the tip of the minute hand shaft and the inner circumference of the fitting hole of the minute hand, the repair part of the minute hand and the minute hand shaft to which the repair part is fitted are thin in structure, thus providing sufficient fit and retaining force. Even if it cannot be obtained, it is possible to reliably prevent needle slippage without being influenced by the external environment such as temperature and vibration by engaging the serration part.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 through 8, and like reference numerals denote like parts.

1 to 3 show one embodiment of the minute hand part according to the present invention, wherein the serrated serration part 15 is integrally formed on the outer circumference of the tip of the minute hand shaft 2 on the resin hollow pipe. The fitting hole 11 of the boss portion 8 of the resin minute hand 5 attached to the minute hand shaft 2 is provided with a serration part engaged with the serration part 15 at an inner circumference thereof. 16) is formed.

In addition, the base portion of the minute hand shaft 2 is integrally formed with an engaging portion 13 for transmitting a driving force from a driving part (not shown) to the shaft. Accordingly, the minute hand shaft 2 is rotated and driven so that the tip end thereof is rotated. The minute hand 5 is to be rotated.

Here, when the minute hand 5 is attached, the number of gears of the serration parts 15 and 16 should be increased as much as possible so that the tip of the minute hand 5 points to the central portion of the character on the dial (not shown). In the present embodiment, the serration portions 15 and 16 are formed so that the number of gears is 45.

In addition, in order to easily assemble the minute hand 5, the fitting dimensions of the serration portions 15 and 16 are designed to loosely fit.

In addition, a protrusion 17 is formed on the lower outer surface of the serration portion 15 of the minute hand shaft 2, and the protruding portion 17 hangs on the inner circumferential surface of the boss portion 8 of the minute hand 5. The recessed groove 18 to be matched is formed.

The lower part of the protrusion 17 of the minute hand shaft 2 and the lower part of the concave groove 18 of the minute hand 5 corresponding thereto are designed to be fitted.

Similarly, the hour hand portion is also formed integrally with the serrated serration portion 19 and the protruding shape 20 on the outer circumference of the tip portion of the hour hand shaft 3 on the resin hollow pipe as shown in FIGS. 4 to 6. And the serration portion 21 engaged with the serration portion 19 on the inner circumference thereof in the fitting hole 12 of the repair portion 9 of the resin needle 6 attached to the hour hand shaft 3 at the same time. ) And a concave groove 22 engaged with the protrusion 20 are integrally formed.

In addition, the base portion of the hour hand shaft 3 is integrally formed with an engaging portion 14 for transmitting a driving force from a driving part (not shown) to the shaft. Accordingly, the hour hand shaft 3 is rotated and driven, The hour hand 6 is adapted to rotate.

In addition, when the hour hand 5 is attached, the serration portions 19 and 21 are formed in as many gears as possible so that the tip of the hour hand 6 points to the central portion of the predetermined letter. In this embodiment, the number of gears is formed to be 60, and the fitting dimensions of the serration portions 19 and 20 are designed to fit loosely, and the protrusion of the hour hand shaft 2 is provided. The lower part of 20 and the lower part of the recessed groove 22 of the hour hand 6 corresponding to this are designed with the dimension which can be fitted.

Therefore, in the present embodiment, the serration portions 15 and 19 are formed at the periphery of the tip end portions of the minute hand shaft 2 and the clock axis 3, respectively, and the respective fittings of the minute hand 5 and the hour hand 6 are fitted. Since the serration portions 16 and 21 which are engaged with the serration portions 15 and 19 are formed in the inner circumference of the holes 11 and 12, the minute hand shaft is formed on the outside of the second hand drive shaft 1. (2) and the minute hand shaft (2) and the hour hand shaft (3) and the bosses (8) and (9) engaged with them in a structure in which the hour hand shaft (3) is arranged in a sequential coaxial state have a thin thickness structure. Inevitably, even if it is unfavorable for the conventional so-called fitting support, engagement can be reliably prevented by engagement of the serration portion, and safety can be further improved.

In addition, since the engagement state is hardly influenced by external environment such as temperature vibration, it is possible to maintain an improved stable engagement state.

Also, the protrusions 17 and 20 of the minute hand shaft 2 and the hour hand shaft 3 are engaged with the concave grooves 18 and 22 of the minute hand 5 and the hour hand 6, respectively. This prevents movement and departure of the needles 5 and 6 attached to the respective shafts 2 and 3 in the axial direction, thereby providing a reliable visual display.

7 and 8 show embodiments other than the minute hand 5 and the hour hand 6 according to the present invention, both of which are formed on the inner circumferences of the bosses 8 and 9, respectively. Each of the serration portions 23 and 24 meshed with the serration portions 15 and 19 of the respective portions is partially formed, and the interlocking serration portions 15, 23 and 19 are ), 24 are designed to fit loosely as necessary for assembly, and the serrations 23, 24, and other portions 25, 26 are each shafts 2, 3 It is designed so that it fits tightly against the serration parts 15 and 19 of (), and the needles 5 and 6 are driven in relation to each axis 2 and 3, respectively.

In addition, this invention is not limited to the said Example, A various change is possible, It is sufficient to form a serration part only in the minute hand part in which the drift | part is a problem, especially in its structure, and denies forming a serration part in a second hand part. It is not.

As described above, the on-vehicle clock according to the present invention has formed a serration portion engaged with at least the outer circumference of the tip of the minute hand shaft and the inner circumference of the fitting hole of the minute hand, so that the boss of the minute hand and the minute hand shaft to which the boss is fitted are the same. Even if the thickness of the structure is thin and sufficient holding force cannot be obtained, the engagement of the serration part makes it possible to reliably prevent the needle slippage without being affected by the external environment such as temperature and vibration, thereby improving safety. Can walk.

Claims (4)

A second hand drive shaft (1), a hollow pipe-type minute hand shaft (2), and an hour hand shaft (3), both of which are made of plastic resin, each having engaging portions (13) and (14), It is formed integrally with the driving force, and the driving force is transmitted from the drive unit, the minute hand shaft and the hour hand shaft are sequentially disposed coaxially to the outside of the second hand shaft, and the outer circumference of the second hand driving shaft and the tip of the minute hand shaft and the hour hand shaft is made of resin, respectively. It is fitted in the fitting holes 10, 11, and 12 formed in the second hand 4, the minute hand 5, and the hour hand 6, and at least the outer periphery and the minute hand 5 of the minute hand shaft 2. In the vehicle-mounted clock engaged with each other on the inner circumference of the fitting hole 11, the first serration portion 15 and the protrusion 17 are integrally formed on the outer circumference of the tip end of the minute hand shaft. The second serration part 16 is engaged with the first serration part and the protrusion part. Being in engagement recessed groove 18 is the clock for a vehicle mounted, characterized in that which is integrally formed on the fitting hole 11 of the minute hand 5 The vehicle-mounted watch according to claim 1, wherein only a part of the inner circumference of the fitting hole (11) of the minute hand (5) has a serration portion (23). 2. The serration portion (19) and (21) engaged with each other are formed in the outer circumference of the distal end of the hour hand shaft (3) and the inner circumference of the fitting hole (12). Car-mounted watch. 2. The projections 20 and concave grooves 22 engaged with each other are formed in the outer periphery of the distal end of the hour hand shaft 3 and the inner circumference of the fitting hole 12 of the hour hand shaft 3, respectively. Car-mounted watch.