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US RE32,783 EGranted
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 consisting of a stationary pole piece of ferromagnetic material which has a radially externally facing frusto-conical section surrounding a cylindrical recess in the stationary pole piece. Both the stationary pole piece and armature are fitted into the bore of a guide tube. Thus, the bore of the guide tube provides the required concentricity between the movable armature and the stationary pole piece. The movable armature is provided with an integral reduced diameter cylindrical nose that is complimentary to the cylindrical recess of the stationary pole piece.
Claims29
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 complimentary to said recess;
- (e) said one member having a [radially externally facing] frusto-conical surface surrounding said recess and facing radially externally into an air gap in said chamber, said air gap extending [into said chamber] from said frusto-conical surface to said armature tube in a region of said chamber not entered by said other member ;
- (f) said armature tube having a non-magnetic section defining a reduced magnetic gap extending coaxially with said air gap and 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 complimentary to said recess;
- (e) said one member having a [radially externally facing] frusto-conical surface surrounding said recess and facing radially externally into an air gap in said chamber, said air gap extending [into said chamber] from said frusto-conical surface to said armature tube in a region of said chamber not entered by said other member ;
- (f) said armature tube having a non-magnetic section means providing a reduced magnetic gap extending coaxially with said air gap and 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 end portion adapted to be received in and complimentary to said recess;
- (e) said one member having [a radially externally facing] an annular concentric frusto-conical surface surrounding said recess and facing radially externally into an air gap in said chamber, said air gap extending [into said chamber] from said frusto-conical surface to said armature tube in a region of said chamber not entered by said other member ;
- (f) said armature tube having a non-magnetic section means providing a reduced magnetic gap extending coaxially with said air gap and 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 reces therein and the other member with a reduced in cross-section end portion adapted to be received in and complimentary to said recess;
- (e) providing said one member with [an externally facing] a frusto-conical surface surrounding said recess and facing radially externally into an air gap in said chamber, said air gap extending [into said chamber] from said frusto-conical surface to said armature tube in a region of said chamber not entered by said other member ;
- (f) providing said armature tube with a non-magnetic section [definiug] means providing a reduced magnetic gap extending coaxially with said air gap and 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.