Stop pawl for horological movement
A stop pawl for a horological movement, including a body provided on the periphery with a lug for latching with the toothing of a ratchet; a hub intended to cooperate freely in rotation with a fixed rod according to an angular displacement between an active position meshing the lug with the toothing of the ratchet and an inactive position, via intermediate positions; wherein the pawl includes at least one device for returning the pawl during its angular displacement, from the inactive position to the active position; and wherein the return device and the body are made in one piece. A horological movement and timepiece can include such a pawl.
1 . A stop pawl for a horological movement, comprising:
a body provided with a lug for latching with the toothing of a ratchet, and a hub configured to cooperate freely in rotation with a fixed rod according to an angular displacement between an active position meshing said lug with the toothing of said ratchet and an inactive position, via intermediate positions; and
one means for returning said stop pawl during its angular displacement, from the inactive position to the active position,
wherein:
said return means and said body are made in one piece,
said return means comprises at least one elastic blade with one end integral with said body and a free opposite end,
the body includes a groove extending between an inner face of said elastic blade and said body from the end integral with said body and to the free end of said elastic blade,
the free end of said elastic blade includes an overhang protruding on the inner face,
said groove includes, facing the overhang, a notch for receiving said overhang,
the lug is located on an outer peripheral surface of the body at a position spaced apart from the at least one elastic blade.
2 . The stop pawl according to claim 1 , wherein said body comprises:
protruding at the periphery of said body and located facing the opposite end, a hooking means in abutment with said opposite end.
3 . The stop pawl according to claim 1 , wherein:
said hub is closed and is in the shape of a circular bore.
4 . The stop pawl according to claim 1 , wherein:
said hub is open, said body having an overall U-shape.
5 . The stop pawl according to claim 1 , wherein:
said body is made of a metallic material.
6 . The stop pawl according to claim 1 , wherein:
said body is made of a nickel-phosphorus alloy.
7 . The stop pawl according to claim 1 , wherein:
said body is manufactured by a LIGA-type method.
8 . A horological movement, comprising:
a supporting structure in the shape of a blank;
a ratchet mounted on said blank in a rotary movement, said ratchet being provided with toothing;
a mechanism for latching with the toothing of said ratchet, said latching mechanism being rotatably mounted inside a housing formed within said blank;
a rod for free rotation of said latching mechanism within the housing of said blank, said rod fixedly cooperating with a bore formed within the housing of said blank; wherein:
said latching mechanism comprises the stop pawl according to claim 1 .
9 . The horological movement according to claim 8 , wherein:
in the upper portion, the rod comprises a head, ensuring the upper retention of the pawl along said rod.
10 . The horological movement according to claim 8 , wherein:
said bore is tapped;
said rod is in the shape of a screw.
11 . The horological movement according to claim 8 , wherein:
said rod is in the shape of a nail driven into said bore.
12 . The horological movement according to claim 8 , wherein:
said housing comprises an inner wall cooperating with an outer face of the elastic blade of said pawl.
13 . A timepiece comprising a horological movement according to claim 8 .