US2690644A - Winding stem - Google Patents

Winding stem Download PDF

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Publication number
US2690644A
US2690644A US25074151A US2690644A US 2690644 A US2690644 A US 2690644A US 25074151 A US25074151 A US 25074151A US 2690644 A US2690644 A US 2690644A
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Prior art keywords
stem
crown
winding
case
winding stem
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Vermot Henri Edmond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hamilton Watch Co
Original Assignee
Hamilton Watch Co
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Publication date
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    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B3/00Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/04Rigidly-mounted keys, knobs or crowns
    • G04B3/041Construction of crowns for rotating movement; connection with the winding stem; winding stems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/955Locked bolthead or nut
    • Y10S411/974Side lock
    • Y10S411/991Transversely sliding

Description

Oct. 5, 1954 H. E. vERMoT 2,690,644

WINDING STEM Filed Oct. lO, 1951 FIG.2

lllllllll-l.l

i I6 INVENTOR HENRI E. vERMor ATTORNEY Patented Oct. 5, 1954 U TE TENT OFFICE WINDING STEM Henri Edmond Verniot, Lancaster Township,

Lancaster County, Pa., assignor to Hamilton Watch Company, Lancaster, Pa.

1 Claim.

This invention is directed to an improved winding stem for watches.

The object of the invention is to provide a one piece winding stem which may be held to permit the crown to be assembled or removed without the use of special tools.

Heretofore, where a watch is cased in a solid back case and the movement is inserted from the dial side, it is necessary to have a two piece stem in order to 'be able to insert the movement without damaging the stem. With the two piece stem it is necessary to increase the distance from the edge of the movement to the inside rim of a case, thus making it necessary to have a larger watch.

It is the object of the present invention to provide a one piece stern which having been affixed to the movement may be inserted in the opening of a solid back case and the crown afterwards aixed to the threaded end of the stem.

It is a further object of the present invention to provide a collar on said stem having flattened opposed surfaces which may be engaged by any ordinary jewelers tool, such as a screw driver, so that the stem may be firmly held to attach or remove the crown.

The invention is shown in the accompanying drawing in which:

Figure 1 is an enlarged perspective view of the stem.

Figure 2 is an enlarged view showing the :function of the flattened opposed surfaces.

Figure 3 is a perspective view of the particular type of watch-case to which the invention is applicable.

Referring particularly to the drawing, the winding stem for a watch is formed with the ordinary screw threaded end 5 for the reception of the crown. The other end of the stem is formed with a bearing 6, a squared section 'I for the reception of the clutch and the winding arbor, a collar B and bearing 9.

Adjacent the bearing 9 a collar Il) is formed with two iiat opposed sides II. The crown I2 is threaded on the end 5 until it abuts the tip I3. This crown must be turned tightly on the screw threaded end 5 so that the watch may be set in a counter-clockwise motion and to permit the back turning of the crown during the winding operation without turning the crown oi the stem. It would be, of course, possible to turn the crown on the threaded end 5 until the mainspring was completely wound, and using the wound mainspring as a stop to continue turning the crown until it engaged the tip I3. This, however, would put a tremendous strain on the winding gears and the mainspring which would probably rupture one or the other before the crown was tightened sui'liciently. It is, therefore, necessary in a one piece stem that some means be provided to securely hold the stem while the crown is threaded thereon, The forming of the flats Il 0n the collar I0 permits the insertion of a screw driver I4 within a slot I5 of the case I6, the screw driver binding against the edge I'I of the slot and the at side II of the collar Ill. Figure 2 shows the screw driver inserted to hold the stem to permit removal of the crown. This construction permits the crown to be securely tightened on the stem without the addition of special tools for holding the stem and allows the dial I8 to be brought closer to the upstanding rim I9 of the case I6, thus permitting an overall smaller watch.

Referring particularly to Figure 3 a watchcase I6 of the type used with this one piece winding stem is shown. The watch-case is formed with a solid back, an upper rim I9 and a movement supporting annular shoulder 20. A hole 2l formed in the side permits the insertion of the one piece winding stem while lugs 22 receive a v strap or band.

What is claimed is:

The combination of a watch-case with a one piece winding stem, said case being formed with a solid back and an unbroken'rim and with a well between the edge of the dial and the rim of the case, said winding stem being formed with a collar projecting into said well, said collar having hat opposing surfaces whereby a screw driver may be inserted between the edge of the well and one of the hat surfaces of the stem to prevent the stem from turning.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,480,511 Colomb Jan. 8, 1924 1,661,232 Perret Mar. 6, 1928 1,976,064 Fink Oct. 9, 1934 2,372,771 Drescher Apr. 3, 1945

US2690644A 1951-10-10 1951-10-10 Winding stem Expired - Lifetime US2690644A (en)

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US2690644A US2690644A (en) 1951-10-10 1951-10-10 Winding stem

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US2690644A US2690644A (en) 1951-10-10 1951-10-10 Winding stem

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US2690644A Expired - Lifetime US2690644A (en) 1951-10-10 1951-10-10 Winding stem

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1480511A (en) * 1921-05-13 1924-01-08 Colomb Henri Timepiece
US1661232A (en) * 1925-10-30 1928-03-06 Hans Wilsdorf Keyless watch
US1976064A (en) * 1932-08-31 1934-10-09 Waltham Watch Co Watch
US2372771A (en) * 1940-12-07 1945-04-03 Hamilton Watch Co Watch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1480511A (en) * 1921-05-13 1924-01-08 Colomb Henri Timepiece
US1661232A (en) * 1925-10-30 1928-03-06 Hans Wilsdorf Keyless watch
US1976064A (en) * 1932-08-31 1934-10-09 Waltham Watch Co Watch
US2372771A (en) * 1940-12-07 1945-04-03 Hamilton Watch Co Watch

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