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US 5,293,685 AGranted
Method of making slide valves with tappets and the slide valves
AssigneeMannesmann Aktiengesellschaft
InventorsHans-Friedrich Meyer, Ernst A. Meyer
Life of this patent
Estimating the term…
Abstract
A tappet for slide valves, in particular for pneumatic multi-way valves, is generally made of steel and has a basic cylindrical shape with control segments located on the basic cylindrical shape and with smaller-diameter intermediate segments, whereby control edges are formed at the transitions between the segments. To be able to manufacture a lightweight tappet using more economical methods, the tappet body is made of plastic and is hollow all the way through, the outer control segments and the smaller-diameter segments between the outer control segments have wall thicknesses which are equal for each type of segment, and the plastic comprise polyoxymethylene or polyamide with a proportion of fillers.
Claims20
A method of making a slide valve with a tappet, said method comprising the steps of:
- a) providing a slide valve body;
- b) providing an injection molding machine;
- c) molding a tappet comprising the following steps:
- c1) providing a mold for the injection molding machine by forming the mold such that the mold is configured to form a body such that the body:
- has a cylindrical shape with two ends and end segments at the ends;
- has at least one intermediate segment between the end segments;
- and
- has a hollow interior space;
- the end segments being cylindrical, the end segments being coaxial with one another, the end segments having at least one diameter, and the end segments having walls which walls have thicknesses and which thicknesses are substantially equal;
- the at least one intermediate segment being cylindrical, the at least one intermediate segment being coaxial with the end segments, the at least one intermediate segment having a diameter which diameter is smaller than the at least one diameter of the end segments, and the at least one intermediate segment having a wall which wall has a thickness;
- c2) providing a plastic material;
- c3) inserting the mold in the injection molding machine;
- c4) inserting the plastic material in the injection molding machine;
- and
- c5) operating the injection molding machine to mold the tappet from the plastic material in the mold, which tappet comprises:
- two ends;
- end segments at the ends;
- and
- at least one intermediate segment between the end segments;
- the tappet having a cylindrical shape;
- the tappet having a hollow interior space;
- the end segments being cylindrical, the end segments being coaxial with one another, the end segments having at least one diameter, and the end segments having walls which walls have thicknesses and which thicknesses are substantially equal;
- the at least one intermediate segment being cylindrical, the at least one intermediate segment being coaxial with the end segments, the at least one intermediate segment having a diameter which diameter is smaller than the at least one diameter of the end segments, and the at least one intermediate segment having a wall which wall has a thickness;
- and
- d) assembling a slide valve comprising inserting the tappet into the slide valve body.
22 more elements
A slide valve with a tappet made by a method comprising the steps of:
- a) providing a slide valve body;
- b) providing an injection molding machine;
- c) molding a tappet comprising the following steps:
- c1) providing a mold for the injection molding machine by forming the mold such that the mold is configured to form a body such that the body:
- has a cylindrical shape with two ends and end segments at the ends;
- has at least one intermediate segment between the end segments;
- and
- has a hollow interior space;
- the end segments being cylindrical, the end segments being coaxial with one another, the end segments having at least one diameter, and the end segments having walls which walls have thicknesses and which thicknesses are substantially equal;
- the at least one intermediate segment being cylindrical, the at least one intermediate segment being coaxial with the end segments, the at least one intermediate segment having a diameter which diameter is smaller than the at least one diameter of the end segments, and the at least one intermediate segment having a wall which wall has a thickness;
- c2) providing a plastic material;
- c3) inserting the mold in the injection molding machine;
- c4) inserting the plastic material in the injection molding machine;
- and
- c5) operating the injection molding machine to mold the tappet from the plastic material in the mold, which tappet comprises:
- two ends;
- end segments at the ends;
- and
- at least one intermediate segment between the end segments;
- the tappet having a cylindrical shape;
- the tappet having a hollow interior space;
- the end segments being cylindrical, the end segments being coaxial with one another, the end segments having at least one diameter, and the end segments having walls which walls have thicknesses and which thicknesses are substantially equal;
- the at least one intermediate segment being cylindrical, the at least one intermediate segment being coaxial with the end segments, the at least one intermediate segment having a diameter which diameter is smaller than the at least one diameter of the end segments, and the at least one intermediate segment having a wall which wall has a thickness;
- and
- d) assembling a slide valve comprising inserting the tappet into the slide valve body.
22 more elements
Dependencies are inferred from the claim text.