Horological display mechanism with elastic hand

Patent metadata

Field	Value
Publication number	US-11841685-B2
Application number	US-202117168504-A
Country	US
Kind code	B2
Filing date	Feb 5, 2021
Priority date	Jul 31, 2018
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

A horological display mechanism (10) with elastic hand (1), including means for driving barrels (2; 4) coaxial at the ends of a flexible blade (3), including a differential mechanism with an input frame (180) including an input toothing (182), free to rotate and carrying an intermediate wheel (103) and a satellite (101) meshing with each other, this satellite (101) including an eccentric finger (1010) traveling the track (105) of a fixed cam (104), and returned against it by the elasticity of the elastic hand (1), the input frame (180) including a shaft (185) carrying, coaxially, a first cannon-pinion (1020) including the first barrel (2) and a second cannon-pinion (1040) including the second barrel (4), the toothing (1049) of one of which meshes with the toothing (1039) of the intermediate wheel (103), and the toothing (1029) of the other one of which meshes with the toothing (1019) of the satellite (101).

First claim

The invention claimed is:

1. A variable-geometry horological display mechanism ( 10 ), including at least one elastic hand ( 1 ) that includes a first drive barrel ( 2 ) secured to a first end of a flexible blade ( 3 ), and a second drive barrel ( 4 ) secured to another end of said flexible blade ( 3 ), and including a display index which, in a non-constrained free state of said elastic hand ( 1 ) in which both said first barrel ( 2 ) and said second barrel ( 4 ) are not subjected to any stress and are distant from each other, is distant from said first barrel ( 2 ) and from said second barrel ( 4 ), the service position of said elastic hand ( 1 ) being a constrained position where said first barrel ( 2 ) and said second barrel ( 4 ) are coaxial with each other around an output axis (D), said display mechanism ( 10 ) including first means for driving said first barrel ( 2 ) about said output axis (D), and second means for driving said second barrel ( 4 ) about said output axis (D), said first drive means and second drive means being arranged to deform said flexible blade ( 3 ), and varying the angular position of said second barrel ( 4 ) with respect to the angular position of said first barrel ( 2 ) around said output axis (D), and to vary the radial position of said display index with respect to said output axis (D), wherein said display mechanism includes a mechanism of the differential type including an input frame ( 180 ) mounted so as to be free to rotate about said output axis (D), said input frame ( 180 ) includes a first pivot ( 183 ) and a second pivot ( 181 ) carrying respectively an intermediate wheel ( 103 ) and a satellite ( 101 ) meshing with each other through their toothings ( 1039 ; 1019 ), said satellite ( 101 ) including an eccentric finger ( 1010 ) that is arranged to travel a track ( 105 ) of a fixed cam ( 104 ), and which is returned against said track ( 105 ) by the elasticity of said elastic hand ( 1 ), said input frame ( 180 ) including an input toothing ( 182 ), and a shaft ( 185 ) that carries, coaxial along said output axis (D), a first cannon-pinion ( 1020 ) including said first barrel ( 2 ) and a second cannon-pinion ( 1040 ) including said second barrel ( 4 ), the toothing ( 1049 ) of one of which meshes with the toothing ( 1039 ) of said intermediate wheel ( 103 ), and the toothing ( 1029 ) of the other one of which meshes with the toothing ( 1019 ) of said satellite ( 101 ).

2. The display mechanism ( 10 ) according to claim 1 , wherein said track ( 105 ) is an internal track.

3. The display mechanism ( 10 ) according to claim 1 , wherein said cam ( 104 ) is the only one.

4. The display mechanism ( 10 ) according to claim 1 , wherein said cam ( 104 ) is arranged to feel the information of an angular delta ⊖ to be applied, said information being directly transmitted to a first cannon-pinion ( 1020 ) and indirectly to a second cannon-pinion ( 1040 ) via an intermediate wheel ( 103 ) for reversing the direction of said angular delta ⊖ to be applied to said first barrel ( 2 ) and to said second barrel ( 4 ) of said elastic hand ( 1 ).

5. The display mechanism ( 10 ) according to claim 4 , wherein said input frame ( 180 ) forming a satellite-holder plate includes a candle ( 185 ) for guiding said first cannon-pinion ( 1020 ) and said second cannon-pinion ( 1040 ), and an external toothing ( 182 ) or a pinion for driving thereof by a horological movement, and pivots ( 181 ; 183 ) for guiding said satellite ( 101 ) and said intermediate wheel ( 103 ), said satellite ( 101 ) including a satellite toothing ( 1019 ) that meshes firstly with a first toothing ( 1029 ) of said first cannon-pinion ( 1020 ) and secondly with an intermediate-wheel toothing ( 1039 ) of said intermediate wheel ( 103 ), which meshes with a second toothing ( 1049 ) of said second cannon-pinion ( 1040 ).

6. The display mechanism ( 10 ) according to claim 1 , wherein said satellite ( 101 ) is the only one, carried by said input frame ( 180 ) forming a satellite-holder plate, and is arranged to feel, on a single said cam track ( 105 ), a single said angular delta ⊖.

7. Horological movement ( 900 ) including at least one display mechanism ( 10 ) according to claim 1 , and arranged to drive said input frame ( 180 ).

8. A watch ( 1000 ) including at least one movement ( 900 ) according to claim 7 .

9. A watch ( 1000 ) including at least one display mechanism ( 10 ) according to claim 1 .

Assignees

• Montres Breguet Sa

Inventors

• Stranczl Marc

Classifications

• G04B19/02 Primary

  Back-gearing arrangements between gear train and hands {(transmissions in general G04B13/00)} · CPC title

• G04B9/005

  by optical indication of the amount of winding · CPC title

• G04B13/001 Primary

  with the choice of adjustable or varying transmission ratio · CPC title

• G04B13/007

  with differential work · CPC title

• G04B13/008

  Differentials · CPC title