US 11,938,808 B2
Obstruction design
Matthew Rose, Blackpool (GB); Richard Forster, Blackpool (GB); and Ryan Wholey, Blackpool (GB)
Assigned to TISS LIMITED, Blackpool (GB)
Appl. No. 17/268,877
Filed by TISS LIMITED, Blackpool (GB)
PCT Filed Aug. 16, 2019, PCT No. PCT/GB2019/052312
§ 371(c)(1), (2) Date Feb. 16, 2021,
PCT Pub. No. WO2020/035702, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 1813462 (GB), filed on Aug. 17, 2018.
Prior Publication US 2021/0323398 A1, Oct. 21, 2021
Int. Cl. B60K 15/04 (2006.01); B60K 15/03 (2006.01)
CPC B60K 15/0403 (2013.01) [B60K 2015/03289 (2013.01); B60K 2015/03434 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An anti-siphon device for securing in a fluid tank inlet, the anti-siphon device defining a longitudinal axis and comprising:
a housing;
an inlet to the housing adapted to receive a fluid-dispensing nozzle, the inlet being at a proximal end of the housing;
an outlet at a distal end of the housing;
an obstruction disposed within the housing, an outer surface of the obstruction and an inner wall of the housing defining a first flow passageway between the inlet and the outlet;
the obstruction comprising:
a chamber disposed within the obstruction, configured to receive fluid,
an inlet aperture in a first portion of the obstruction;
an outlet aperture in a second portion of the obstruction;
a proximal portion having a generally curved outer surface terminating at an apex lying on the longitudinal axis;
a mid-portion defining an outer surface which runs parallel to the axis; and
a distal portion having an outer surface which is generally tapered, the taper increasing the diameter of the distal portion in a distal direction along the longitudinal axis;
the inlet aperture, chamber, and outlet aperture defining a second flow passageway between the inlet aperture and the outlet aperture, the second flow passageway being configured such that, in use, fluid can flow from the inlet aperture to the outlet aperture via the second flow passageway, whilst fluid flows from the inlet to the outlet via the first flow passageway.