US3940644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural brush DC machine and commutator assembly
Assignee: Union Carbide Corp
•
Filing: 1974-10-15
•
Granted: 1976-02-24
•
Expires: 1994-10-15
Abstract
Abstract In a direct current machine having plural brushes arranged for sliding engagement over the surface of the commutator assembly along separate paths; wherein the commutator assembly comprises a multiple number of commutator bars with each bar having a current transfer surface divided into conducting and nonconducting sections, each section being located in one of the separate paths, and with the sections of adjacent commutator bars so arranged to provide a checkerboard pattern of conducting and nonconducting sections over the commutator assembly surface. The brushes are interconnected to the machine load through a predetermined circuit network which controls the short circuit current.
Inventors
- 👤 August Frederick Manz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:34
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/46; H02; H02K; H02K13/00; H02K13/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
In a direct current machine comprising: a field structure; an armature adapted for rotation within said field structure and having an armature winding consisting of a plurality of armature coils; a single commutator mounted for rotation with said armature and divided into a multiple number of commutator bars each insulated from one another; said armature coils being electrically coupled to said commutator bars; and at least two commutating brush sets arranged for relative sliding engagement against the current transfer surface of each commutator bar along separate paths respectively, the improvement comprising: wherein the current transfer surface of each commutator bar includes at least one conducting section and one nonconducting section respectively with each section lying in a separate path and with the abutting sections of adjacent commutator bars arranged so as to form a checkerboard pattern of conducting and nonconducting sections along the separate paths traversed by each brush set; and circuit means for electrically coupling said brush sets to one another.
Claim 2
Dependent Claim
162 words
In a direct current machine comprising: a field structure; an armature adapted for rotation within said field structure and having an armature winding consisting of a plurality of armature coils; a single commutator mounted for rotation with said armature and divided into a multiple number of commutator bars each insulated from one another; said armature coils being electrically coupled to said commutator bars; and at least two commutating brush sets arranged for relative sliding engagement against the current transfer surface of each commutator bar along separate paths respectively, the improvement comprising: wherein the current transfer surface of each commutator bar includes at least one conducting section and one nonconducting section respectively with each section lying in a separate path and with the abutting sections of adjacent commutator bars arranged so as to form a checkerboard pattern of conducting and nonconducting sections along the separate paths traversed by each brush set; and circuit means for electrically coupling said brush sets to one another.
Claim 3
Dependent Claim
57 words
In a direct current machine as defined in claim 1 wherein each brush set includes a positive and negative brush and wherein said circuit means includes a first circuit network for electrically coupling the positive brushes of the brush sets together and a second circuit network for electrically coupling the negative brushes of the brush sets together.
Claim 4
Dependent Claim
47 words
In a direct current machine as defined in claim 2 wherein said first circuit network comprises first and second resistor means adapted therebetween for connection to a load and wherein said second circuit network comprises first and second resistor means adapted therebetween for connection to the Load.
Claim 5
Dependent Claim
41 words
In a direct current machine as defined in claim 3 wherein said first and second resistor means of said first circuit network is equal to one another and to the corresponding first and second resistor means of said second circuit network.
Claim 6
Dependent Claim
43 words
In a direct current machine as defined in claim 3 wherein said brush sets are arranged to travel along said separate paths in unison such that when one set engages said conductive sections the other set engages said nonconductive sections and vice versa.
Claim 7
Dependent Claim
56 words
In a direct current machine as defined in claim 2 wherein each commutator bar is a composite structure containing a conductive body having at least one predetermined surface geometry representative of said conductive section and at least one detachable nonconductive section having a predetermined surface geometry substantially identical to the surface geometry of said conductive section.
Claim 8
Dependent Claim
57 words
In a direct current machine as defined in claim 6 wherein each commutator bar of said commutator is arranged to form a geometric cylinder with its longitudinal axis concentric with the longitudinal axis of the armature and wherein each nonconductive section of each commutator bar is alternately disposed with respect to the nonconductive sections of adjacent bars.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |