Patent ID: 8104138

Claim:
A portable handheld suction/blower apparatus comprising: a motor-driven blower; an air guide tube for conducting a flow of air therethrough generated by said motor-driven blower; said motor-driven blower and said air guide tube conjointly defining a connecting interface whereat said air guide tube is connected to said motor-driven blower; said connecting interface defining a periphery and being configured as at least a two-thread thread connection; said thread connection including a number of pairs of outer thread sections of an outer winding and inner thread sections of an inner winding; one of said thread sections of each one of said pairs extending over an angular extent (α) and the other one of said thread sections of said one pair extending over an angular extent (β); said periphery of said connecting interface being subdivided into a number of angular segments corresponding to the number of said pairs with each of said angular segments extending over an angular extent (γ); the sum of the angular extents (α, β) of a pair of individual ones of said outer and inner thread sections being overall less than the angular extent (γ) of the angular segment corresponding to said pair; said connecting interface including a latching protective device to prevent separation of said air guide tube from said motor-driven blower; said protective device including at least one latch spring on one side of said connecting interface and at least one spring receptacle on the opposite-lying other side of said connecting interface; and, the number of said spring receptacles corresponding to the number of threads of said thread connection.