| 摘要 |
The positioning control device of a hand welder helmet visor (9) comprises a control being fitted on the welding tool handle (2) and manageable by its holding user's hand, and insures that the welding tool only will be put in operation if the visor is brought down. One of its embodiments includes lever means (1), a flexible wire (4) slidable inside a sheath (5), a spring (6) fitted on the hinge of the visor (8) and blocking means (3) which hinders the welding tool operation whenever the visor is brought up. It will be also possible to use a pneumatical, hydraulic, electrical and electromagnetical radiation transmission between the tool handle and the visor. The technical field of the invention embraces the operator protection helmets for welding operations and similar ones. <IMAGE> |
