US3803832A - Dial for wrist watch and a method of making the same - Google Patents

Dial for wrist watch and a method of making the same Download PDF

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Publication number
US3803832A
US3803832A US00326023A US32602373A US3803832A US 3803832 A US3803832 A US 3803832A US 00326023 A US00326023 A US 00326023A US 32602373 A US32602373 A US 32602373A US 3803832 A US3803832 A US 3803832A
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United States
Prior art keywords
dial
pin
head portion
recess
cross sectional
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Expired - Lifetime
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US00326023A
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English (en)
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N Shimizu
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Individual
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Individual
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Priority to US412290A priority Critical patent/US3924791A/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/12—Selection of materials for dials or graduations markings
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0069—Watchmakers' or watch-repairers' machines or tools for working materials for working with non-mechanical means, e.g. chemical, electrochemical, metallising, vapourising; with electron beams, laser beams

Definitions

  • a dial for a wrist watch comprises a dial body formed of a flat plate of aluminum and rivet like pin members made of aluminum material and for securing supporting the dial plate body to a time-keeping mechanism.
  • the head portion of each pin member is formed so as to fit into a recess formed on the reverse surface of the body and being integrally fixed to the recess by means of ultrasonic wave welding.
  • a method of making the dial for the wrist watch is characterized in that when the head portion of the pin member is joined to the recess, a chip of the ultrasonic wave welding machine is pressure bonded to the head portion to provide the ultrasonic wave vibration so as to integrally join the head portion to the recess.
  • the present invention relates to a dial structure for a wristwatch and to a method of making the same, and
  • the dial for the wrist watch comprises a dial body and a pin bonded to its reverse surface.
  • the pin is in serted into a hole formed in the timekeeping mechanism and a set screw is urged against the pin in a right angle direction whereby the dial is fixed on the upper surface of the timekeeping mechanism.
  • the conventional dial is made of brass and a hollow pin in bonded by means of a soldering means.
  • the pin is soldered on the dial by soldering; for example, silver solder is sealed inside of the hollow pin and this pin is tack welded to the dial by spot welding. Thereafter the silver solderis melted by a burner or furnace, and the joint is formed by the application of the silver solder.
  • the brass which is the material of the conventional. dial has disadvantages such as it is more expensive than aluminum, its weight is heavier and also it has the difficulty of requiring forming work or surface treating and the like. Also, when the dial making involves electroplating with nickel, cyanide is used which is poisonous and which therefore is potentially harmful to the human body. Also, the residue therefrom may eventually flow to rivers which will become a public hazard.
  • the dial can be made of a light weight; (2) the post or succeeding processing or treatment such as forming, surface coating and printing and the like can be easily performed; (3) desirable designs can be provided and (4') the dial can be constructed at low cost.
  • the present invention is characterized in that the dial body is formed of aluminum material a recess is formed at a predetermined position on the body; a rivet like pin member is formed of aluminum or similar material; a head portion of the pin member fits into the recess; and the head portion and the recess are joined by the welding energy of an ultrasonic wave.
  • FIGS. 5 and 10 are cross sectional views of the condition where the pin'is welded to the dial by the chip of the ultrasonic wave welding machine;
  • FIGS. 6 and 111 are bottom plan views, partially in section, of the dial body and the pin integrally welded together;
  • FIG. 7 is a cross sectional view showing one adverse example where the pin is welded to the dial body by the chip of the ultrasonic wave welding machine;
  • FIG. 8 is a perspective view of the second embodiment of the pin
  • FIG. 12 is a cross sectional view of the chip used for welding the pin of the second embodiment to the dial plate.
  • FIG. 13 is a cross sectional view of a structural arrangement wherein the dial is welded by the conventional method to the pin and the dial-pin unit is fixed to the time-keeping mechanism.
  • a circular flat dial plate 10 is provided with a circular center hole 11 and a rectangular aperture 12.
  • a circular recess 13 is formed in the vicinity of the periphery of the reverse surface of the dial body 10.
  • the recess 13 is formed by measuring a predetermined position on the dial with the use of a jig for accurately positioning and by boring the recess with an endmill or dia.
  • the pin 15 and the dial body 10 are secured to a time-keeping mechanism.
  • the pin 15 is formed with a rivet like shape as shown inFIG.
  • the diameter of the head portion l4 is slightly smaller than the diameter of the recess 13, and also its wall thickness is equal to the depth of the recess 13 or is slightly shallower than the depth.
  • the pin 15 that is welded to the dial body 10 is employed for securing the dial to the time-keeping mechanism, it is required to have a high tensile strength and bending strength.
  • a thickness of the head portion 14 was made 0.18 mm, its diameter was 0.9 mm, a diameter of the pin 15 was 0.65 mm,; the pressure of the chip 16 for the head portion 14 was kg, and its pressure contact time was 0.25 sec., the current of the ultrasonic wave welding machine was 2.5A, and the ultrasonic wave welding machine whose oscillating frequency was 19.5 KI-I was used; the pin 15 whose recess 13 was welded to the head portion 14 could withstand the tensile strength of 6 kg and also could withstand the bending strength (angle of 20) of 15 times in the right and left directions or forward and backward directions, and such tensile strength and the bending strength having such values to substantially surpasses the tensile strength and bending strength ordinarily required for welding of the the pin to the dial plate body.
  • the saliant features are that, as mentioned in the foregoing, the recess 13 being provided in the dial plate body 10, the head portion of the pin 15 being fitted and ultrasonically welded into the recess 13 wherebythe joint surface of both elements can be made larger thus stronger. Also, with the foregoing arrangement, when the above-mentioned joining is made, there are advantages in that the erection of the pin 15 on the surface of-the dial body and the application of the pressure of the chip 16 to the pin become extremely easy.
  • FIG. 6 illustrates the joining structure of 13 and the head portion 14. It can be recognized that a welded portion 17 is formed in ring shape and the reason for such form is that the tip portion of the chip 16 is formed in ring shape and thusly is made to correspond to the portion that is that to be urged against.
  • the pressure contacting portion produces a strong abrading action as compared with the other portion.
  • the pressure of the chip 16 against the head portion 14 can be made greater and its pressure contacting time can be prolonged. However the pressure and the pressure contacting time should not exceed certain maximum values. As shown in FIG.
  • the pin 115 is provided with an enlarged diameter tapered neck portion 115a at the joint of the stem portion and the head portion 114.
  • This enlarged neck portion does not become a problem when the dial body is fixed to the time-keeping mechanism.
  • the neck portion a plays a role of preventing the shearing off the pin 115 from the stem portion of the pin 115 from the head portion 114 when the force of a fixed tensile and/or bending strength is applied to the pin 115. Namely, when the pin 115 is being welded to the dial body 10 the stem portion of the pin 115 may be sheared off from the head portion 114 when the an excess tensile and/or the bending force is applied to the pin 115.
  • the dial body 110 is provided with a different shaped surface in the recess, according to the second embodiment.
  • a recess 113 is provided with a surface 113a whose center or medial section is elevated and is tapered from the me dial section to the periphery of the recess.
  • the projecting surface 113a produces abrading action that is necessary for its joining to the center surface of the head portion 114. Therefore when the required tensile and- /or bending force is applied to the pin 115, it plays a role of preventing the shearing off of the head portion 114 from the concave portion 113.
  • the head portion 14 for the recess 13 may be sheared off from the recess 13 when an excess tensile and/or bending force is applied to the pin as the ring like portion 17 along is being integrally welded thereto.
  • the recess 113 is provided with the surface 113a the necessary abrading action is produced on recess 113 and the center surface of the head portion 114 when the tip portion of the chip 116 is pressure contacted with the head portion 114. Therefore, as shown in FIG. 11, in addition to a welded portion 117, the welded portion 119 is formed on the center surface.
  • the tensile and/or bending strength for the pin 115 becomes remarkably improved as compared with a recess that has not been provided with the projecting surface 113a.
  • the head portion 114 of the pin 115 being provided with an enlarged neck portion 115a can be welded to the recess 113. Also, the head portion of the pin 115 can be welded to the recess 113 that is provided with the surface 113a. Therefore, various structural arrangements of the elements can be effected.
  • the chip 116 has a structure which is substantially identical with that of the chip 16, with the exception that a tapered expanded portion lll6b is provided at the tip of the hole whose shape is adapted to engage with the enlarged neck portion 1115a.
  • the conventional dial 210 is provided with a pin 2115.
  • the pin 215 is made with a hollow shape, and inside thereof is sealed with silver solder 300.
  • the pin 215 is welded to the dial 210 by means of the silver solder 300 the disadvantage of which has already been explained.
  • the dial 210 having been mounted in contact with pin 215, as shown in FIG. 13, is then inserted in a time-keeping mechanism 301.
  • a set screw 302 is pressure contacted with the pin 215 at right angles from the lateral direction whereby the pin is fixed to the time-keeping mechanism 301.
  • dial bodies It) and 110 may be made of an alloy whose prin- 1 cipal component is aluminum which alloy can be welded by ultrasonic welding. Also instead of providing the tapered surface 113a on the recess 113, a portion whose shape is similar to the tapered surface 1130 may be provided on the center surface of the head portion 114. Also, the present invention is not to be limited to the numerical values described in the foregoing description.
  • a dial structure for a wrist watch comprising in combination:
  • dial body formed of a flat plate of aluminum and having front and rear surfaces, said dial body having a plurality of circular recesses positioned on its rear surface adjacent the periphery thereof, each of said recesses having an inner surface continuously tapering from an elevated medial section to the periphery thereof;
  • each of said pin members formed of an aluminum material and having elongated stem and flat head portions, said stem portion integrally joined with said flat head portion and adapted to engage with a time keeping mechanism, said stem portion having an enlarged neck portion at the joint of said stem portion and said flat head portion, said enlarged tapered neck portion adapted to engage withan ultrasonic welding machine, said flat head portion of each of said pin members fixedly joining in a perpendicular manner with said elevated medial section of each of said inner surfaces of said recesses, respectively, of said dial body, said joint between said flat head portion and said elevated medial section adapted to be accomplished by the welding of said ultrasonic welding machine.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
US00326023A 1972-02-01 1973-01-23 Dial for wrist watch and a method of making the same Expired - Lifetime US3803832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US412290A US3924791A (en) 1972-02-01 1973-12-27 Method of making a dial for a wrist watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47011541A JPS4881565A (en:Method) 1972-02-01 1972-02-01

Publications (1)

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US3803832A true US3803832A (en) 1974-04-16

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JP (1) JPS4881565A (en:Method)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1538493A1 (fr) * 2003-12-03 2005-06-08 Asulab S.A. Cadran émaillé avec pieds chassés et son procédé de fabrication
EP1538492A1 (fr) * 2003-12-03 2005-06-08 Asulab S.A. Cadran émaillé avec pieds et son procédé de fabrication
US20130148484A1 (en) * 2010-06-22 2013-06-13 The Swatch Group Research And Development Ltd Dial foot of a timepiece
EP3339970A1 (fr) * 2016-12-21 2018-06-27 Rubattel et Weyermann S.A. Cadran d'horlogerie dont le matériau est un alliage léger

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708293A (en) * 1925-07-31 1929-04-09 Waltham Watch Co Dial with yielding foot for timepieces
CH348363A (fr) * 1958-02-22 1960-08-15 Liss S A Cadran
US3523845A (en) * 1966-06-27 1970-08-11 Cavitron Corp Method and apparatus for joining a series of elements to a workpiece by ultrasonic energy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708293A (en) * 1925-07-31 1929-04-09 Waltham Watch Co Dial with yielding foot for timepieces
CH348363A (fr) * 1958-02-22 1960-08-15 Liss S A Cadran
US3523845A (en) * 1966-06-27 1970-08-11 Cavitron Corp Method and apparatus for joining a series of elements to a workpiece by ultrasonic energy

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1538493A1 (fr) * 2003-12-03 2005-06-08 Asulab S.A. Cadran émaillé avec pieds chassés et son procédé de fabrication
EP1538492A1 (fr) * 2003-12-03 2005-06-08 Asulab S.A. Cadran émaillé avec pieds et son procédé de fabrication
US20130148484A1 (en) * 2010-06-22 2013-06-13 The Swatch Group Research And Development Ltd Dial foot of a timepiece
EP3339970A1 (fr) * 2016-12-21 2018-06-27 Rubattel et Weyermann S.A. Cadran d'horlogerie dont le matériau est un alliage léger
WO2018114500A1 (fr) 2016-12-21 2018-06-28 Rubattel Et Weyermann S.A. Cadran d'horlogerie dont le materiau est un alliage leger
CN110178093A (zh) * 2016-12-21 2019-08-27 鲁巴特和韦尔曼股份有限公司 轻合金材质的钟表表盘
CN110178093B (zh) * 2016-12-21 2021-03-09 鲁巴特和韦尔曼股份有限公司 轻合金材质的钟表表盘

Also Published As

Publication number Publication date
JPS4881565A (en:Method) 1973-10-31

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