US2663991A - Anchor escapement for timepieces - Google Patents

Description

Dec. 1953 M. HUGUENIN 2,663,991

ANCHOR ESCAPEMENT FOR TIMEPIECES Filed June 14, 1952 ATTOKA EV Patented Dec, 29, 1953 ANtCHOR ESCAPEMENT FOR. TIMEPIECES .l'arc i-iuguenin, Geneva, Switzerland, assignor to Montres Rolex S. 1%., Geneva, Switzerland,

a firm of Switzerland Application June 14, 1952, Serial No. 293,502

Claims priority, application Switzerland August 13, 1951 2 Claims.

The present invention has for its object an anchor escapement for he-pieces. This escapement is characterized the fact the edges of each anchor pallet or arch ciece project with reference to the upper and lo er oi the anchor so to provide between the projecting parts of the pallet walls and sai upper and lower surfaces of the anchor longi and trans vers l dihedral angles forming lary for a provision oil. The longitudinal passages along one sur ace of the such r are furthermore connected v the longitudinal along the second rces by further passages constituted by the dihedral angles formed one hand between the transverse surface of the anchor and the abutment surface of the pallet on the other he: d. between s "'d transverse surface of the anchor the ii; pact surface of the pallet, this latter "ihedral angle being equal at a maximum to 90.

i ccompanyiug drawings illustrate by way or example a preiea'ed embodiment of the object of my invention. In said drawings;

Fig. 1 is perspective view of a section of an anchor escapement.

2 illustrates dia rammatically the passages provided for the lubricating oil.

The anchor illustrated is designated by l and the escape wheel b 2. pallets or arch-pieces of the anchor shown at 3 have their longitudinal ridges 5, 5 and l projecting with reference to the upper and lower surfaces 8 and i of the anchor. Dihedral angles are thus formed between the said surfaces 8, t of the anchor and the projecting portions of the pallet walls. These d1- hedral angles form capillary passages l0, ll, i2 and 93, it, for a provision of oil as illustrated diagrammatically in Fig. 2.

The passages l2 and is on the opposite surfaces of the anchor are interconnected by a passage it formed by the dihedral angle defined by the abutment surface ll of the corresponding pallet and the transverse surface I8 of the anchor. Similarly a passage l9 connects the passages it and to, said passage i9 being constituted by the dihedral angle defined by the transverse surface of anchor and the impact surface of the pallet. It should be remarked that bevelled surfaces such as 2i: are provided in the transverse surface of the anchor so that the dihedral angles forming the passages [9 may be acute and thereby the oil may be prevented from spreading over the transverse surface of the anchor.

The different abovecnentioned passages form thus a closed circuit. illustrated in dot and dash lines in Fig. 2 and through which the provision of oil is adapted to flow. The abutment surface ii of each pallet is comparatively short so that the teeth 2a of the escapement wheel may enter the meniscus formed by the oil inside the passage it at each abutment stage. i'he tooth is then laden with oil that lubricates the li pulse surface 25 of the pallet. it may occur that a certain amount of oil left by the tooth to the moment at which it leaves the pallet, collects on the impact surface. This oil moves gr towards the bevel and it then engages the latter and collects with the oil in the passage 'l'his oil removed by the teeth oi the escape wheel follows thus the path shown as an interrupted line in Fig. 2.

What I claim is:

i. In a time-piece, the provision of an anchor escapement comprising an anchor having two parallel outer surfaces and a transverse surface and provided with pallet recesses opening into said transverse surface, a pallet fitted in each oi said recesses and provided with outer surfaces that project beyond the corresponding outer surfaces of the anchor, said pallet including a ter minal operative section projecting beyond the transverse surface of the anchor, said pallet fining between its lateral and terminal engaging the recess surfaces and each outer surface of the anchor, dihedral angles at the utmost equal to 99 forming interconnected capillary paths adapted to receive a provision of oil, the terminal section of the pallet forming w th the transverse surface of th anchor further 0 edra-l angles defining capillary paths connecting the first mentioned paths corresponding to the two outer surfaces of the anchor, and a toothed escape wheel cooperating with the anchor pallets.

2. In a timepiece, including an anchor escapement, comprising an anchor having two parallel outer surfaces transverse suiiacc and providcd with pallet recesses opening into said transverse surface, two pallets fitted in said recesses, and a toothed escape Wheel cooperating with said pallets, each pallet being provided with outer surfaces that project beyond the corresponding outer surfaces of anchor, and including a terminal operative section projecting beyond the transverse surface of the anchor, each pallet defining, between its lateral and terminal surfaces engaging the recess surfaces and each outer sur- 3 face of the anchor, dihedral angles, and the terminal section of the pallet forming with the transverse surface of the anchor further dihedral angles; the feature that said dihedral angles are at the utmost equal to 90, that they define interconnecting capillary paths, and that oil is provided in said paths, whereby the teeth of said escape Wheel enter the oil meniscus in one of said paths, take drops of said oil with them, and leave at least a part of said oil in another of said paths, the whole in such a way that, as said paths MARC HUGUENIN.

References Cited in the file of this patent FOREIGN PATENTS Number Country Date 115,558 Switzerland July 1, 1926 216,458 Switzerland Dec. 1, 1941

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