×

Watch having a case formed at least partially from a hard material

  • US 4,956,830 A
  • Filed: 10/26/1987
  • Issued: 09/11/1990
  • Est. Priority Date: 10/07/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. A watch, comprising:

  • a case at least partially formed from a hard material incapable of establishing a reliable fluid tight seal, said case including a continuous and uninterrupted, closed outer caseband (3) formed of said hard material, and an inner caseband (16) housing a watch movement (18) and formed of a rigid but easily machinable metallic material capable of establishing a reliable fluid tight seal, said inner caseband including a first cylindrical bore (29) extending radially therethrough for accommodating a setting stem (27) disposed therein and extending therethrough, said stem being engaged therein in a fluid tight manner by a packing (31) lodged in a peripheral annular groove (30) on the stem so as to be sealingly applied against an inner circumferential wall of said first cylindrical bore, said outer caseband including a second cylindrical bore (28) extending radially therethrough and axially aligned with the first cylindrical bore in the inner caseband, and the stem passing through said second cylindrical bore and having an outer end portion extending to an exterior of the watch, the diameter of the second bore being larger than the diameter of the first bore to enable the insertion of the stem through said bores and into the movement, and the thickness of the inner caseband being greater than the thickness of the movement to establish a sufficient strength of the inner caseband surrounding the first bore to prevent any cross-sectional flattening thereof and an attendant disruption of the stem seal therewith, wherein the outer caseband is fashioned integrally with a central hub portion (4) defining a dial (5), and wherein a cavity (6) bounded by the outer caseband and the central hub portion and intended to house the watch movement includes a recessed annular sump surrounding a thickened stiffening portion (15) provided in a central part of the hub portion, the inner caseband being seated against said sump, and the radial length of said annular sump corresponding approximately to the radial length of the inner caseband.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×