Back to results
US 6,283,008 B1Granted
Shock-proof hydraulic cylinder
AssigneeSTILL GmbH
InventorsPeter Schönewald, Christian Baerwolff, Heniz Gaffke
Life of this patent
Estimating the term…
Abstract
The invention relates to a shockproof hydraulic cylinder that has a cylinder housing (1), in which a plunger (4) that is driven via a plunger shaft (10) is arranged to move axially, and optionally a hollow-cylinder damping plunger (11). Using different embodiments, an end-position damping is carried out on one or both sides. Plunger shaft (10), plunger (4) and damping plunger (11) can be designed in a hollow-cylinder form.
Claims10
A shockproof hydraulic cylinder comprising
- a) a cylinder housing (1), in which a plunger (4) that is connected to a plunger shaft (10) is arranged to move axially, and
- b) an annular cylinder chamber (7), defined by the inner surface of cylinder housing (1), the outer surface of plunger shaft (10), the bottom side of the plunger shaft guide of cylinder head (20) and the top side of plunger (4), and said cylinder chamber 7 is connected to a hydraulic medium reservoir via a defined choke site,
- c) whereby in its lower area, plunger shaft (10) has at least one opening that connects the outside of the plunger shaft with a hydraulic medium reservoir and that is sealed by the plunger shaft guide of cylinder head (20) shortly before the upper plunger end position is reached, and
- d) a hollow-cylinder damping plunger (11), which is arranged to move axially in cylindrical bore (8) of plunger (4), which is prestressed by means of a spring (15).
1 more element
Dependencies are inferred from the claim text.