US 8,783,943 B2 · Detent escapement and manufacturing method thereof

Abstract

A detent escapement for a timepiece has an escape wheel and an actuating lever. A balance is mounted to undergo pivotal movement about a pivot axis and is configured to contact a wheel tooth of the escape wheel and an unlocking stone. The actuating lever has a locking stone configured to contact the wheel tooth of the escape wheel, a locking stone support arm that supports the locking stone, an actuating spring having a contact portion capable of contacting the unlocking stone, and an actuating spring support arm for determining a position of the contact portion of the actuating spring. At least two of the locking stone support arm, the actuating spring, and the actuating spring support arm are formed of the same material and have the same thickness in a direction along the pivot axis of the balance.

Claims20

Dependent claims

A detent escapement for a timepiece comprising:

an escape wheel;
a balance pivoted about a balance staff and having an impulse pallet which can contact a wheel tooth of the escape wheel and an unlocking stone;
and
a blade having a locking stone which can contact the wheel tooth of the escape wheel, a locking stone support arm that supports the locking stone, a one side actuating spring having a portion capable of contacting the unlocking stone, and a one side actuating spring support arm which determines a position of an unlocking stone contact portion which is positioned in a tip of the one side actuating spring,
wherein at least two of the one side actuating spring, the one side actuating spring support arm, and the locking stone support arm of the blade are formed of the same material and have the same thickness in a direction along an axis of the balance staff.

2 more elements

A method of manufacturing a detent escapement for a timepiece which includes an escape wheel, a balance pivoted about a balance staff and having an impulse pallet which can contact a wheel tooth of the escape wheel and an unlocking stone, and a blade having a locking stone which can contact the wheel tooth of the escape wheel, a locking stone support arm that supports the locking stone, a one side actuating spring having a portion capable of contacting the unlocking stone, and a one side actuating spring support arm which determines a position of an unlocking stone contact portion which is positioned in a tip of the one side actuating spring, the method comprising:

a step of forming a resin layer on a conductive layer;
and
a blade forming step of simultaneously forming at least two of the one side actuating spring, the one side actuating spring support arm, and the locking stone support arm of the blade by using a portion of the resin layer formed on the conductive layer.

Dependencies are inferred from the claim text.

Detent escapement and manufacturing method thereof

Life of this patent

Detent escapement and manufacturing method thereof

Life of this patent

Abstract

Claims20