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A hand pump system for pressurizing and de-pressurizing a pneumatic cylinder on a traction device. The hand pump system includes a hand pump having a pump head with a vent hole. A flow control assembly has a stem portion extending into the pump head. The stem portion has a primary chamber fluidly co

A hand pump system for pressurizing and de-pressurizing a pneumatic cylinder on a traction device. The hand pump system includes a hand pump having a pump head with a vent hole. A flow control assembly has a stem portion extending into the pump head. The stem portion has a primary chamber fluidly coupled to the pneumatic cylinder and a stem passageway extending through the stem portion. The housing is rotatable within the pump head between a pump position fluidly coupling the stem passageway with the pump; to a release position fluidly coupling the stem passageway with the vent hole; and to a positive shut off position to seal the vent hole with a vent seal and to seal the stem passageway with a pump seal. A pressure gauge is included in the flow control assembly fluidly coupled to the primary chamber.

대표청구항 ▼

[ What is claimed is:] [1.] A hand pump system for pressurizing and de-pressurizing a pneumatic cylinder on a traction device, the hand pump system comprising:a hand pump having a pump head with a vent hole; anda flow control assembly having a stem extending into the pump head, the stem having a pri

[ What is claimed is:] [1.] A hand pump system for pressurizing and de-pressurizing a pneumatic cylinder on a traction device, the hand pump system comprising:a hand pump having a pump head with a vent hole; anda flow control assembly having a stem extending into the pump head, the stem having a primary chamber for fluidly coupling to the pneumatic cylinder and a stem passageway extending through the stem and fluidly coupled with the primary chamber, the place pump head being rotatably to a pump position fluidly coupling the stem passageway with the pump, to a release position fluidly coupling the stem passageway with the vent hole, and to a positive shut-off position sealing the vent hole with a vent seal and sealing the stem passageway with a pump seal.