Patent attributes
A press pump (1) comprises a press pump body 10) in which a spring tube (20) is provided, a spring (21) is contained within the spring tube (20); a cylinder head (30) mounted on the press pump body 10) and including a internal bore (31); a press head (40) including a pressing portion (41) and a rod portion (42), the rod portion (42) is fit within the internal bore (31) of the cylinder head (30), and a lower portion of the rod (42) engages with the spring (21), so that the spring (21) applies an upward bias force on the press head (40); and a piston (50) connected to the press head (40) and is slidably and sealingly engaged with the internal circumference of the press pump body 10). The press pump (1) can use a spring (21) with relatively small size, while meet the requirement of large displacement, thus reducing manufacturing cost, and also can prevent contact between the product and the spring (21), avoiding negative effects between them.
