by a shoulder 61 a disposed at the end of extension piece 61 cooperating with a collar or neck 60 a formed at the end of body 60 body 60 of device 6 also has a locking system permitting extension piece 61 to be immobilized or locked or latched in a retracted position in which the major part of extension piece 61 is located within body 60 as shown most clearly in fig4 b the locking system is constituted by a latch 67 a carried by a button 67 mounted for pivotal movement about a pivot axis 68 carried by body 60 button 67 is biased by a spring 69 toward a rest position in which latch 67 a projects into body 60 and cooperates with shoulder 61 a of extension piece 61 in order to retain extension piece 61 in the rest position latch 67 a is carried by the part of button 67 that is closer to pivot element 62 while spring 69 is located at the opposite side of button 67 with respect to pivot axis 68 thus in order to unlatch extension piece 61 it is sufficient for the user to rock button 67 against the action of spring 69 in a manner to displace latch 67 a away from shoulder 61 a this allows extension piece to automatically move to its deployed position by the action of spring 66 in an advantageous manner the resulting cord guide device can be dimensioned to guide the cord over a length portion of between 60 and 120 mm such a cord guide device presents the advantage of simplifying storage of the iron as a result of the reduced amount of space occupied by cord.