Inwardly opening mechanical vent system
AssigneeJ. C. Carter Company, Inc.
InventorsTak-Yiu Wong, James Turvey
Life of this patent
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Abstract
An inwardly opening mechanical vent system is provided for use in a fluid tank having a bottom loading valve and a vent formed in an upper tank surface. The vent system includes a spring interposed between a vent valve and a body extending downwardly into the tank to bias the vent valve upwardly into a closed position. A shaft extends downwardly from the vent valve and is connected to a lever mechanism. The lever mechanism includes a scissor-hinge assembly connected to a trunnion of the body. A linkage rod extends upwardly from the bottom loading valve and is capable of actuating the lever mechanism to lower the shaft and vent valve into the tank to open the vent when the bottom loading valve is opened.
Claims21
An inwardly opening mechanical vent system for use in a fluid tank having a bottom loading valve and a vent formed in an upper tank surface, the vent system comprising:
- a vent valve positioned within the tank and biased upwardly to seal the vent;
- a shaft extending downwardly from the vent valve;
- a lever mechanism operably connected to the shaft generally opposite the vent valve;
- and
- a linkage rod extending upwardly from the bottom loading valve and capable of actuating the lever mechanism to lower the shaft and vent valve into the tank to open the vent when the bottom loading valve is opened.
An inwardly opening mechanical vent system for use in a fluid tank having a bottom loading valve and a vent formed in an upper tank surface, the vent system comprising:
- a body extending downwardly into the tank from the upper tank surface;
- a vent valve associated with the body and configured to seal the vent;
- a spring interposed between the vent valve and the body to bias the vent valve upwardly into a closed position;
- a shaft extending downwardly from the vent valve;
- a lever mechanism including a scissor-hinge assembly operably connected to the shaft generally opposite the vent valve and a trunnion of the body;
- and
- a linkage rod extending upwardly from the bottom loading valve and capable of actuating the lever mechanism to lower the shaft and vent valve into the tank to open the vent when the bottom loading valve is opened.
An inwardly opening mechanical vent system for use in a fluid tank having a bottom loading valve and a vent formed in an upper tank surface, the vent system comprising:
- a body extending downwardly into the tank from the upper tank surface;
- a vent valve associated with the body and configured to seal the vent;
- a spring interposed between the vent valve and the body to bias the vent valve upwardly into a closed position;
- a shaft extending downwardly from the vent valve;
- lever mechanism operably connected to the shaft generally opposite the vent valve and a trunnion of the body, the lever mechanism comprising a scissor-hinge assembly including a counter lever pivotally attached to the trunnion intermediate first and second ends thereof, an upper hitch connected at one end thereof to the shaft and pivotally connected at the other end thereof to the first end of the counter lever, and a lower hitch connected at one end thereof to a slide associated with a guide extending from the body, the lower hitch being pivotally attached at the other end thereof to the second end of the counter lever;
- and
- a linkage rod extending upwardly from the bottom loading valve and capable of actuating the lever mechanism by engaging the slide to lower the shaft and vent valve into the tank to open the vent when the bottom loading valve is opened.
Dependencies are inferred from the claim text.