Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A suction device comprising a suction conduit and a suction source connected thereto and further comprising a sleeve member (3) arranged at the front end of the suction conduit (1) and forming the suction opening (2) of the device, said sleeve member is limitedly displaceable in axial direction from a first position, in which it covers side passages (5,6;8,9;15) to the suction conduit (1), to a second position in which said side passages are exposed, characterized in, a resilient member (4) arranged to hold the sleeve member (3) in said first position in which suction is performed through the suction opening (2) and that the sleeve member against the action of the resilient member (4) due to a certain pressure difference immediately outside and inside the suction opening (2) is arranged to automatically be displaced to said second position, in which the side passages (5,6;8,9;15) to the suction conduit are opened, at which the suction force in the suction opening (2) is reduced.
Claim 2
Dependent Claim
163 words
A suction device comprising a suction conduit and a suction source connected thereto and further comprising a sleeve member (3) arranged at the front end of the suction conduit (1) and forming the suction opening (2) of the device, said sleeve member is limitedly displaceable in axial direction from a first position, in which it covers side passages (5,6;8,9;15) to the suction conduit (1), to a second position in which said side passages are exposed, characterized in, a resilient member (4) arranged to hold the sleeve member (3) in said first position in which suction is performed through the suction opening (2) and that the sleeve member against the action of the resilient member (4) due to a certain pressure difference immediately outside and inside the suction opening (2) is arranged to automatically be displaced to said second position, in which the side passages (5,6;8,9;15) to the suction conduit are opened, at which the suction force in the suction opening (2) is reduced.
Claim 3
Dependent Claim
24 words
A suction device as claimed in claim 1, characterized in. that the suction opening (2) of the sleeve member (3) is toothed or wavy.
Claim 4
Dependent Claim
54 words
A suction device as claimed in claim 1 or 2, characterized in , that the sleeve member (3) shows a portion having a reduced cross-section at the suction opening (2). so that in said second position side passages (15) are formed between the front edge of the suction conduit (1;12) and the sleeve member.
Claim 5
Dependent Claim
22 words
A suction device according to any of the preceding claims, characterized in, that the prestressing of the resilient element (4) is adjustable.