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US 4,604,600 AGranted
Solenoid construction and method for making the same
AssigneeG. W. Lisk Company, Inc.
InventorBruce D. Clark
Life of this patent
Estimating the term…
Abstract
A proportional solenoid has a fixed pole piece 39 and a movable armature 45, both fitted into the bore 52 of a guide tube 36 that provides the required concentricity between the fixed and movable pole pieces 39 and 45. One of the pole pieces has a cylindrical recess 56 and the other pole piece has a reduced diameter cylindrical nose 62 that is complementary to cylindrical recess 56. A radially inwardly facing frusto-conical surface 95 is formed in cylindrical nose 62 to be disposed within recess 56 of the other pole piece and provide a frusto-conical pole piece section producing a linear force-stroke curve.
Claims33
An assembly for use in a solenoid comprising:
- a. a hollow solenoid armature tube adapted to be received in a solenoid coil, said tube having an armature chamber therein;
- b. a stationary pole piece member fixed in and defining one end of said armature chamber;
- c. an armature member positioned in said armature chamber of said tube for axial sliding movement relative to and defining an armature stroke relative to said pole piece member;
- d. one of said members having an axially extending recess therein and the other member having a reduced in cross section end portion adapted to be received in and complementary to said recess;
- e. said other member having a radially internally facing frusto-conical surface formed on said reduced in cross section end portion and disposed within said recess;
- f. said armature tube having a non-magnetic section defining a reduced magnetic gap extending coaxially with at least a portion of said armature stroke sufficient to permit selected magnetic forces to be produced on said armature;
- and
- g. said armature tube providing concentricity of said two members.
5 more elements
An assembly for use in a solenoid comprising:
- a. a hollow solenoid armature tube adapted to be received in a solenoid coil, said tube having an armature chamber therein;
- b. a stationary pole piece member fixed in and defining one end of said armature chamber;
- c. an armature member positioned in said armature chamber of said tube for axial sliding movement relative to and defining an armature stroke relative to said pole piece member;
- d. one of said members having an axially extending recess therein and the other member having a reduced in cross section end portion adapted to be received in and complementary to said recess;
- e. said other member having a radially internally facing frusto-conical surface formed on said reduced in cross section end portion and disposed within said recess;
- f. said armature tube having a non-magnetic section means providing a reduced magnetic gap extending coaxially with at least a portion of said armature stroke sufficient to permit selected magnetic forces to be produced on said armature;
- and
- g. said armature tube providing concentricity of said two members.
5 more elements
An assembly for use in a solenoid comprising:
- a. a one-piece cylindrical metal hollow solenoid armature tube adapted to be received in a solenoid coil, said tube having a cylindrical armature chamber therein;
- b. a stationary pole piece member fixed in and defining one end of said armature chamber;
- c. a cylindrical armature member positioned in said armature chamber of said tube for axial sliding movement defining a stroke gap relative to and defining an armature stroke relative to said pole member;
- d. one of said members having an axial concentric cylindrical recess therein and the other cylindrical member having a reduced in cross section axial cylindrical concentric and portion adapted to be received in and complementary to said recess;
- e. said other member having a radially internally facing frusto-conical surface formed on said reduced in cross section end portion and disposed within said recess;
- f. said armature tube having a non-magnetic section means providing a reduced magnetic gap extending coaxially with at least a portion of said armature stroke sufficient to permit selected magnetic forces to be produced on said armature;
- and
- g. said armature tube providing concentricity of said two members.
5 more elements
A method of providing an assembly for use in a solenoid comprising the steps of:
- a. providing a hollow solenoid armature tube adapted to be received in a solenoid coil, said tube having an armature chamber therein;
- b. providing a stationary pole piece member fixed in and defining one end of said armature chamber;
- c. providing an armature member positioned in said armature chamber of said tube for axial sliding movement relative to and defining an armature stroke relative to said pole piece member;
- d. providing one of said members with a recess therein and the other member with a reduced in cross section end portion adapted to be received in and complementary to said recess;
- e. providing said other member with an internally facing frusto-conical surface formed on said reduced in cross section end portion and disposed within said recess;
- f. providing said armature tube with a non-magnetic section defining a reduced magnetic gap extending coaxially with at least a portion of said armature stroke sufficient to permit selected magnetic forces to be produced on said armature;
- and
- g. said armature tube providing concentricity of said two members.
5 more elements
Dependencies are inferred from the claim text.