Vapor recovery nozzle with mechanical flow interlock

• US 3,982,571 A
• Filed: 05/16/1975
• Issued: 09/28/1976
• Est. Priority Date: 05/16/1975
• Status: Expired due to Term

• Current Assignee: Emco Wheaton, Inc.
• Original Assignee: Emco Wheaton, Inc.
• Inventors: Swain, Leonard W., Fenton, David T.
• Primary Examiner(s): Knowles, Allen N.
• Assistant Examiner(s): Lane, Hadd
• Application Number:
  US05/578,044
• Time in Patent Office: 501 Days
• Field of Search: 222/52, 141/207, 141/208, 141/193, 141/225, 141/292
• US Class Current: 141/225
• CPC Class Codes: B67D 2007/545 Additional means for preventing dispensing of liquid by incorrect sealing engagement with the tank opening of the vapour recovering means, e.g. bellows, shrouds
• CPC Class Codes: B67D 7/54 with means for preventing escape of liquid or vapour or for recovering escaped liquid or vapour B67D7/44 takes precedence

Abstract

In a dispenser nozzle having, a main body portion, a filling tube projecting from one end of said main body portion, and a liquid flow passage extending through said main body and said filling tube, the filling tube being adapted to be located within the open end of a neck of a fuel storage tank of a vehicle or the like, a control valve mechanism for controlling the flow of liquid through said liquid flow passage, said mechanism including a valve operating mechanism and latching means for releasably engaging said valve operating mechanism to render said valve operating mechanism operative when engaged by said latching mechanism and inoperative when released by said latching mechanism, the improvement of sensor means mounted on said nozzle and disposed adjacent said filling tube, said sensor means communicating with said latch means to release said latch means with respect to said valve operating mechanism to render said valve operating mechanism inoperative when said filling tube is now disposed in a predetermined operative relationship within a fuel storage tank, said sensor means cooperating with said fuel storage tank when said filling tube is located in a predetermined operative relationship with respect to a fuel storage tank to permit said latch means to move to a position to engage said valve operating mechanism to render said valve operating mechanism operative to permit the flow of liquid through said liquid flow passage into said tank.

Claims

1. In a dispenser nozzle having, a main body portion, a filling tube projecting from one end of said main body portion, and a liquid flow passage extending through said main body and said filling tube, the filling tube being adapted to be located within the open end of a neck of a fuel storage tank of a vehicle or the like, a control valve mechanism for controlling the flow of liquid through said liquid flow passage, said mechanism including a valve operating mechanism and latching means for releasably engaging said valve operating mechanism to render said valve operating mechanism operative when engaged by said latching mechanism and inoperative when released by said latching mechanism, a vacuum chamber in said main body, a pressure sensitive diaphragm in the vacuum chamber, means connecting the diaphragm to the latching means for moving the latching means between its operative and inoperative positions, vacuum passage means communicating between the vacuum chamber and a vacuum generating source within the body which is operative in response to the flow of fluid therethrough and a vent passage having one end opening into the vacuum chamber, the other end of the vent passage opening adjacent the end of the filling tube whereby the vacuum chamber may be vented by way of the vent passage to permit the latching means to be retained in a position in which the valve operating mechanism is operative, vapour recovery passage means formed in said main body, an extensible vapour recovery shroud mounted on said main body and having one end communicating with the vapour recovery passage means of said main body and the other end urged towards the discharge end of the filling tube, the shroud extending substantially coaxially with respect to the filling tube and having a tight seal collar at said other end thereof for engagement with the end of the filling pipe of the gas tank in use to direct vapour expelled from the tank during filling to the vapour recovery passage by way of the shroud, the improvement of;

i. a normally closed check valve mounted in the main body and having a valve member in said vent passage for opening and closing said vent passage to release said latching means when the vent passage is closed thereby,

ii. resilient valve operating is disposed between said shroud and said filling tube and extending from said valve member to said tight seal collar for moving said valve member to said open position when said tight seal collar is moved a predetermined distance towards said body to form a seal with the end of the filling pipe of the gas tank or the like.