Horology: time measuring systems or devices – Chronological – With significant casing or mounting support structure
Patent
1987-12-21
1989-08-29
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With significant casing or mounting support structure
G04C 2302
Patent
active
048624322
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a securing construction for timepieces, and more particularly, a construction of securing analogue electronic timepieces provided with frames, trains, motors, circuit members and the like.
BACKGROUND ART
It is known from prior arts that members of analogue timepieces are secured by screws.
FIG. 1 shows a construction for securing stators and coil blocks in a prior electronic timepiece. Guide screw pins 16 and 16' are driven in the opening of a plate 11 to be secured by an interference. A stator 12 and a coil block 13 are positioned at guide pins 16 and 16', and secured to the plate 11 by tightening screws 17 and 17'.
Further, as a construction for securing members of timepieces without utilizing screws, the securing construction utilizing heat caulking is known.
However, such a prior securing construction utilizing screws has the following problems:
(1) Screws and screw pins are required, so that cost-up occurs according to the increase of the members;
(2) The control of torque is not stabilized when screws are tightened in assembly, therefore, such a construction has a disadvantage that when the tightened torque is small, looseness of screws may occur and when the tightened torque is large, screws may be broken off.
(3) When a frame of a timepiece is made of a low strength material such as plastic, such a construction has disadvantages in quality or after-sale services, since the frames of the timepieces may be broken by driving the screw pins, or the frame of the timepiece may be broken or the fixing power of the screw pins may be reduced by secular change because some stress is always added to the frame due to the interference between the screw pins and frame. Next, with respect to the method for securing members in utilizing heat caulking, the following problems occur in the magnetic connecting portion between a core of a coil block and a stator, and an electroconductive portion.
(1) When a core of the coil block and the stator is in magnetically contacted with each other with heat caulking, a sufficient heat caulking is required in order to obtain a sufficient contact and a sufficient contact load between them. When the heat caulking is conducted by utilizing some jigs, it is difficult to control the sufficient contact and the contact load in view of the dimensional variation of respective members. As a result, an additional process for the heat caulking is required.
Further, in the heat caulking, it is difficult to give the contact load between the coil block and the stator. (As the reaction is always given to the plastic, the plastic is modified easily till the stress becomes zero by secular change. In particular, the plastic is modified easier under a high temperature.) Consequently, spaces are generated between the core of the coil block and the stator, and the property is inferior due to the reduction of the magnetic connection.
(2) With regard to an electric conductor, the same thing as the above is mentioned. Namely, it is necessary to always press the electric conductors toward each other under a contact load of at least 50g. However, as mentioned above, as the strees is always added to plastic, the heat calking portion is modified by secular change and there is danger that any problem such as incomplete conduction occurs in quality.
(3) When the coil block is brought in contact with the stator by only a heat caulking, it is not possible to give after-sale service at all, and as a result, a problem, occurs, for example, the value of the product is lost.
Thereupon, to eliminate the above problems, the object of the present invention is to provide a securing construction for an analogue timepiece wherein a plate, that is, a timepiece frame, is secured to a timepiece members supported by a supporting member without any screws, to decrease the number of the members, and to provide a low cost timepiece having a high quality and reliability.
DISCLOSURE OF INVENTION
Namely, a securing construction of timepieces in accordance with the present inv
REFERENCES:
patent: 4437768 (1984-03-01), Miyasaka
patent: 4453833 (1984-06-01), Saitoh
patent: 4555184 (1983-01-01), Fujimori
Hiraga Imao
Kubota Masaru
Okakura Yojiro
Shimura Noriaki
Takashi Osamu
Kaplan Blum
Miska Vit W.
Seiko Epson Corporation
Shiojiri Kogyo Kabushiki Kaisha
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