Control cable self-adjustment device

A control cable self-adjusting device fitted to an intermediate point on a control cable, said control cable (2) comprising a steel cable (3) and a sheath (4) for the steel cable (3), said sheath (4) having sheath ends (21,23) attached to respective fixed points (22,24) and intermediate ends (13,14) between the sheath ends (21,23) so that said sheath (4) is in two separate portions, wherein said self-adjusting device comprises:

• a hollow base body (5) of a longitudinally extended cylindrical shape, having a closed end (10) and an open end (9) remote from said closed end (10) and provided with a throughgoing passage (11) through which said steel cable (3) passes with free play, said closed end (10) of said base body (5) being attached to one (13) of said intermediate ends of said sheath (4);
• a regulating stem (6) held axially movable in an interior of said hollow base body (5), said regulating stem (6) having a rear end (27) facing said closed end (10) of said base body (5) and a front end (15) facing said open end (9) of said base body (5), said front end (15) of said regulating stem (6) being connected to another (14) of said intermediate ends of said sheath and said regulating stem (6) being provided with a throughgoing passage (12) through which said steel cable (4) passes;
• and
• retaining means (7) for fixing said stem (6) in a position relative to said base body (5), said retaining means (7) including a retaining coil (26) arranged on said rear end (27) of said stem (6) and having a circular cross-section with respective ends (28,29) spaced a distance from each other, a substantially saw-tooth shaped threaded section (25) provided in said interior of said base body (5) and having an orthogonal side (43) facing said open end (9) of said base body (5), said retaining coil being engaged in said threaded section (25) and said threaded section (25) having a pitch substantially the same as that of said retaining coil (26), and linking means for connecting said rear end (27) of said stem (6) and said retaining coil (26) with each other so that said stem (6) is movable in one direction in said base body (5) from inside to outside by successive double elastic deformations of said retaining coil or in either said one direction from inside to outside or in another direction from outside to inside by screwing action of said retaining coil (26) in said threaded section (25) of said base body (5).