Connection to the threaded pin and box, box of backrest for the same seat, connection of pin and box, and method for changing a connection of the tool support conventional

摘要

"Connection to a threaded pin and box, box of backrest for the same seat, connection of pin and box, and method for changing a connection of the tool of conventional design.A connection of tubes with pin (11) and box (12) threaded (male and female), which has the support of the Constitution (15, 16) which contact when the pin and box threads are completely coupled.When the initial engatamento backrests, load flanks (36, 31) of the fillets of pin and box more out of touch with the support of the constitution.Pick up one another and begin to separate gradually each other for a quantity increasing, the length of the fillets coupled.In one direction from the tip of the pin to a point aferidor connection.When the application of torque to the constitution.The separation between the flanks of load distributes the forces of torque between the backrests of the constitution along the length of the fillets coupled to prevent concentration of stress forces pru00f3xiMo to the base of the thread of the pin.The separation of progressive load flanks is achieved by changing the pitch of the thread of the sidewall progressively loading pin and / or box, to vary the width of the thread.The separation of the flanks of loading is achieved without modifications of the step of the flank of the coup.The step of flank load is reduced uniformly along the length of the thread to, effectively, a step different per unit length.The amount of reduction in the step of fillet of flank load is equivalent to the constitution, for example, thirty degrees of four fillets per unit length.