HANDHELD WORK APPARATUS HAVING A PUMP, SAID PUMP AND PUMP BELLOWS THEREFOR

摘要

A handheld work apparatus has a fuel supply system and a pump for delivering fuel from the fuel supply system. The pump has an elastic pump bellows which can be actuated by the operator. The pump bellows has a fastening section at which the pump bellows is fastened to a housing. The pump bellows has a main section and a roof section, wherein the roof section has a dome-shaped section adjoining the main section and a cap which adjoins the dome-shaped section and closes off the dome-shaped section. In order to achieve a rapid return of the pump bellows from the actuated position into the unactuated position, even at low temperatures, it is provided that the smallest wall thickness (g) of the main section is at least 10% greater than the smallest wall thickness (h) of the dome-shaped section.

主权项

1. A handheld work apparatus comprising:
a housing; a fuel tank; a fuel supply system; a pump configured to convey fuel from said fuel supply system; said pump having an elastic pump bellows configured to be actuated by a user; said pump bellows defining an interior space and having an attachment section configured to connect said pump bellows to said housing; a first valve configured to open into said interior space in a flow direction; a second valve configured to open out of said interior space in said flow direction; an intake line connected to said interior space via said first valve; an outflow line connected to said interior space via said second valve; said pump bellows further having a base section and a roof section; said roof section having a dome-shaped section adjoining said base section and a cap adjoining and capping said dome-shaped section; said pump bellows having an outer wall and an outer diameter (c, d, e) configured so as not to increase at any locations of said outer wall extending from the region of said base section adjoining said attachment section up to said cap in a direction of said cap; said dome-shaped section has a dome-shaped section wall thickness having a wall minimum thickness (h); said base section has a base section wall thickness having a minimum wall thickness (g); and, said minimum wall thickness (g) being at least 10% greater than said minimum wall thickness (h).