Plunger seal assembly and method of making the same

In a method of making an assembly of a seal means and a plunger movable relative to said seal means, the improvement comprising the steps of forming said seal means with a relatively thin and substantially flat washer-like resilient seal member having an opening therethrough, forming said seal means from a cup-like member through which said plunger extends, disposing said washer-like member in said cup-like member to be carried thereby, disposing a plurality of ring-like seal members in stacked relation in said cup-like member so as to receive said plunger therethrough, causing one of said ring-like seal members to abut said washer-like seal member, disposing a ring-like keeper in said cup-like member to sandwich said washer-like seal member between said keeper and said one ring-like seal member, and press-fitting said plunger through said opening in such a manner that an inner peripheral portion of said washer-like member is turned into substantially parallel sealing and wiping engagement with said plunger while being substantially transverse to the remainder of said washer-like member, said washer-like seal member initially extending radially inboard of said ring-like seal members and said keeper and said step of press-fitting said plunger through said opening of said washer-like seal member taking place after said washer-like seal member, said ring-like seal members and said keeper are disposed in said cup-like member.