A valve cap (10) comprising a unitary body (18), and a sealing ring (19) nested within the body (18), the body comprising a round tubular wall portion (20) defining a central passage (15) with an opening at the bottom end of the body and a roof portion (21) which closes off the passage (15) at the top end of the body (18), the sealing ring (19) internally contacting the roof portion (21) thereabove, the body (18) having an external portion or surface (27) for gripping, internally the body (18) having a threaded section (23) comprising a spiraling internal thread (25) and threadless section (24) beneath the threaded section (23) comprising a smooth inner surface (26) extending down from the threaded section (23) to the base of the body (18), the internal thread (25) being of standard dimension 5/16 UNEF and having a pitch of around 0.794 mm, the thread (25) winding internally between one and four revolutions, the distance, 'd', between the bottom of the internal thread (25) and the bottom of the seal (19) being between 0.5 and 3.0 mm, the arrangement being such that the cap (10) is screwable onto a valve (11) in between one and three full rotations before it is halted by abutment with the sealing ring (19), resulting in a sealed engagement. krIn at
IMPROVEMENTS IN OR RELATING TO CAPS OR PRODUCTS WITH CAPS
2018-04-26
Patent
Electronic Resource
English
Online Contents | 1994
Shipping Caps, Torque Caps, and Body Plugs Ergonomic Design Criteria
SAE Technical Papers | 2015