US4878000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved trigger-type control switch for D.C. motors
Assignee: Individual
•
Filing: 1988-06-21
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Granted: 1989-10-31
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Expires: 2008-06-21
Abstract
Abstract An improved triggering switch for DC motors having a base support, a pressing member operatively mounted over the base support, a coupling stand with an open section installed in an upper portion of the base support, a set of motor terminals and power source terminals combined with a contact shaft respectively disposed in the open section of the coupling stand, and a selection button adjustably installed at the base support and movably connected to the contact shaft. The improvement includes a braking member having an elongated terminal connected to a negative terminal of the motor terminals and a C-shaped contact portion formed at a rear end thereof fixedly disposed around the motor and the power source terminals in the open section of the coupling stand with the C-shaped contact portion being positioned in line with a rear end of a positive terminal of the motor terminals; thereby, when the contact shaft is moved back with the power source being cut off, the C-shaped contact portion and the positive terminal of the motor terminals will be connected by the contact shaft to short-circuit the motor and immediately stop it.
Inventors
- 👤 Shang-Hsieh Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:07
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/02; H01H9/06; H02; H02P; H02P7/00; H02P7/06; H02P7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
184 words
An improved triggering switch having a base support, a pressing member operatively attached to the base support, a non-conductive coupling stand with an open section disposed in an upper portion of the base support, a set of DC motor and power source terminals combined with a contact shaft installed in the open section of the coupling stand, and a selection button adjustably installed on the base support and movably coupled with the contact shaft, comprising: a braking means made of conductive material and including an elongated terminal portion connected to a negative terminal of the motor terminals and a C-shaped contact portion disposed at a rear end of the coupling stand and aligned with a rear end of a positive motor terminal; so that, when the contact shaft is moved backward with the power source of the DC motor being turned off, a pair of contact points of the contact shaft will be connected between said C-shaped contact portion of said braking means and the positive motor terminal so as to short-circuit the motor terminals and effect an immediate stop to the DC motor.
Claim 2
Dependent Claim
184 words
An improved triggering switch having a base support, a pressing member operatively attached to the base support, a non-conductive coupling stand with an open section disposed in an upper portion of the base support, a set of DC motor and power source terminals combined with a contact shaft installed in the open section of the coupling stand, and a selection button adjustably installed on the base support and movably coupled with the contact shaft, comprising: a braking means made of conductive material and including an elongated terminal portion connected to a negative terminal of the motor terminals and a C-shaped contact portion disposed at a rear end of the coupling stand and aligned with a rear end of a positive motor terminal; so that, when the contact shaft is moved backward with the power source of the DC motor being turned off, a pair of contact points of the contact shaft will be connected between said C-shaped contact portion of said braking means and the positive motor terminal so as to short-circuit the motor terminals and effect an immediate stop to the DC motor.
Claim 3
Dependent Claim
136 words
In an improved triggering switch of the type having a base support, a pressing member operatively attached to the base support, a non-conductive coupling stand with an open section disposed in an upper portion of the base support, a set of motor terminals and power source terminals, together with a contact shaft, installed in the open section of the coupling stand, and a selection button adjustably disposed on the upper portion of the base support and movably engaged with the contact shaft, the improvement comprising a braking means integrally formed together with a negative terminal of the motor terminals for being connected to a positive terminal of the motor terminals through a backward movement of the contact shaft so as to cause a short-circuit to the motor terminals and effect an immediate stop of the motor.
Claim 4
Dependent Claim
136 words
In an improved triggering switch of the type having a base support, a pressing member operatively attached to the base support, a non-conductive coupling stand with an open section disposed in an upper portion of the base support, a set of motor terminals and power source terminals, together with a contact shaft, installed in the open section of the coupling stand, and a selection button adjustably disposed on the upper portion of the base support and movably engaged with the contact shaft, the improvement comprising a braking means integrally formed together with a negative terminal of the motor terminals for being connected to a positive terminal of the motor terminals through a backward movement of the contact shaft so as to cause a short-circuit to the motor terminals and effect an immediate stop of the motor.
Claim 5
Dependent Claim
54 words
The improved triggering switch according to Claim 2 wherein said braking means comprises a C-shaped contact portion integrally formed at a rear end of the negative terminal of said motor terminals and positioned in line with a rear end of the positive terminal of said motor terminals so as to short-circuit the connection therewith.
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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |