Patent ID: 6842403

Claim:
A chronograph comprising: a chronograph hand stem which can be driven in rotation when a first actuating element is actuated manually, said chronograph hand stem carrying a chronograph hand, a seconds heart cam arranged on the chronograph hand stem for resetting the chronograph hand, a rattrapante hand stem, coaxial with the chronograph hand stem, carrying a rattrapante hand overlapping the chronograph hand, a rattrapante heart cam which can connect the chronograph hand stem to the rattrapante hand stem in a rotationally fixed manner, a rattrapante gripper having prestressed gripper arms which can grip a rattrapante wheel fixed on the rattrapante hand stem to block said rattrapante wheel against rotation, a switching element which can be rotated between a blocking position and an unblocking position when a second actuating element is actuated manually, said gripper arms being lifted from the rattrapante wheel so that said rattrapante wheel can rotate when said switching element is in said unblocking position, and a third actuating element which, when moved manually from an inactive position to an active position, causes said chronograph hand stem and said chronograph hand to be moved into their zero position, and causes said switching element in its blocking position to move into its unblocking position, and causes said switching element in its unblocking position to remain in its unblocking position.