US3562452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlock between circuit interrupters and drawout fuse drawers of indoor power center
Assignee: Allis Chalmers Corp
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Filing: 1968-10-18
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Granted: 1971-02-09
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Expires: 1988-10-18
Abstract
Abstract An interlock between fuse drawout drawers and circuit interrupters of an indoor power center has cams rotatable by the circuit interrupter operating members to actuate cam followers having enlarged diameter portions, a rocking bar operatively connected adjacent its ends to the cam followers, and a stationary stop positioned intermediate the ends of the rocking bar to permit pivoting of the rocking bar by a cam follower when either operating member is actuated to close a circuit interrupter but to interfere with transverse translation of the rocking bar and thus prevent displacement of both cam followers when the operating members are actuated in an attempt to close both switches simultaneously. Ganged interfering arms are rotatable between positions wherein they obstruct withdrawal of the fuse drawers and wherein the fuse drawers may be withdrawn, and means for preventing closure of either circuit interrupter when a fuse drawer can be withdrawn and for preventing withdrawal of a fuse drawer when either circuit interrupter is closed includes a longitudinally reciprocable interlocking bar having keyhole openings receiving said cam followers and parallel crank linkage means operatively connecting said interfering arms and said interlocking bar.
Inventors
- 👤 Thomas H Keogh
- 👤 Adolph E Krupit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:07
CPC Classifications
H; H02; H02B; H02B11/00; H02B11/12; H02B11/127; H02B11/133; H01; H01H; H01H9/00; H01H9/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
240 words
An interlock for a pair of circuit interrupters each having a rotatable shaft for actuating it between open and closed positions comprising, in combination: a pair of eccentric cams each of which is operatively connected to and adapted to be rotated by one of said rotatable shafts; a pair of generally parallel elongated rod cam followers; means for resiliently urging each of said cam followers against one of said cams, said cam upon rotation displacing said cam follower rod longitudinally and effecting maximum displacement of said cam follower rod when said interrupter is in closed position and minimum displacement thereof when said interrupter is in open position; an elongated rocking bar pivotally connected adjacent its ends to said cam follower rods; stationary stop means intermediate the ends of said rocking bar for permitting said rocking bar to pivot when either cam follower rod is displaced by the corresponding cam and for preventing translation of said rocking bar in a direction transverse to its length when either cam follower rod is at said maximum displacement, whereby both of said circuit interrupters cannot be closed simultaneously; means for resiliently urging said cam follower rods against said cams; and adjusting means extending longitudinally of and threaded to one end of said cam follower rods and engaging said cams for selectively changing the length of said cam follower rods, whereby the position of said rocking bar relative to said stop means may be adjusted.
Claim 2
Dependent Claim
240 words
An interlock for a pair of circuit interrupters each having a rotatable shaft for actuating it between open and closed positions comprising, in combination: a pair of eccentric cams each of which is operatively connected to and adapted to be rotated by one of said rotatable shafts; a pair of generally parallel elongated rod cam followers; means for resiliently urging each of said cam followers against one of said cams, said cam upon rotation displacing said cam follower rod longitudinally and effecting maximum displacement of said cam follower rod when said interrupter is in closed position and minimum displacement thereof when said interrupter is in open position; an elongated rocking bar pivotally connected adjacent its ends to said cam follower rods; stationary stop means intermediate the ends of said rocking bar for permitting said rocking bar to pivot when either cam follower rod is displaced by the corresponding cam and for preventing translation of said rocking bar in a direction transverse to its length when either cam follower rod is at said maximum displacement, whereby both of said circuit interrupters cannot be closed simultaneously; means for resiliently urging said cam follower rods against said cams; and adjusting means extending longitudinally of and threaded to one end of said cam follower rods and engaging said cams for selectively changing the length of said cam follower rods, whereby the position of said rocking bar relative to said stop means may be adjusted.
Claim 3
Dependent Claim
207 words
An interlock for a pair of circuit interrupters each having an operating member for actuating it between open and closed positions comprising, in combination: a pair of cams each of which is operatively connected to and adapted to be rotated by one of said operating members; an elongated cam follower rod engaging each said cam, said cam upon rotation displacing said cam follower lOngitudinally and having a limit position thereon providing maximum displacement of said cam follower when said interrupter is in closed position; an elongated rocking bar pivotally connected adjacent its ends to said cam followers; and means including a stationary defeater pin stop member positioned adjacent said rocking bar intermediate its length on the side thereof away from said cams for permitting said rocking bar to pivot about said stop member when either cam follower is displaced by the corresponding cam and for preventing transverse translation of said rocking bar when either cam follower is at said maximum displacement, whereby both of said circuit interrupters cannot be closed simultaneously, said defeater pin stop member being manually retractable to a position wherein it does not interfere with movement of said rocking bar, whereby both of said circuit interrupters can be closed when it is so desired.
Claim 4
Dependent Claim
207 words
An interlock for a pair of circuit interrupters each having an operating member for actuating it between open and closed positions comprising, in combination: a pair of cams each of which is operatively connected to and adapted to be rotated by one of said operating members; an elongated cam follower rod engaging each said cam, said cam upon rotation displacing said cam follower lOngitudinally and having a limit position thereon providing maximum displacement of said cam follower when said interrupter is in closed position; an elongated rocking bar pivotally connected adjacent its ends to said cam followers; and means including a stationary defeater pin stop member positioned adjacent said rocking bar intermediate its length on the side thereof away from said cams for permitting said rocking bar to pivot about said stop member when either cam follower is displaced by the corresponding cam and for preventing transverse translation of said rocking bar when either cam follower is at said maximum displacement, whereby both of said circuit interrupters cannot be closed simultaneously, said defeater pin stop member being manually retractable to a position wherein it does not interfere with movement of said rocking bar, whereby both of said circuit interrupters can be closed when it is so desired.
Claim 5
Dependent Claim
188 words
An interlock for a pair of circuit interrupters each having an operating member for actuating it between open and closed positions and between said circuit interrupters and a fuse drawer reciprocable between open and closed positions comprising, in combination; a pair of cams each of which is operatively connected to and adapted to be rotated by one of said operating members; a pair of cam followers each of which engages one of said cams, said cam upon rotation displacing said cam follower and effecting maximum displacement thereof when said interrupter is in closed position; an elongated rocking bar operatively connected adjacent its ends to said cam followers; stop means intermediate the ends of said rocking bar for permitting said rocking bar to pivot when either cam follower is displaced by the corresponding cam and for preventing transverse translation of said rocking bar when either interrupter is closed and the corresponding cam follower is at said maximum displacement, whereby both of said circuit interrupters cannot be closed simultaneously, and means responsive to said maximum opening displacement of either of said cam followers for preventing opening of said fuse drawer.
Claim 6
Dependent Claim
188 words
An interlock for a pair of circuit interrupters each having an operating member for actuating it between open and closed positions and between said circuit interrupters and a fuse drawer reciprocable between open and closed positions comprising, in combination; a pair of cams each of which is operatively connected to and adapted to be rotated by one of said operating members; a pair of cam followers each of which engages one of said cams, said cam upon rotation displacing said cam follower and effecting maximum displacement thereof when said interrupter is in closed position; an elongated rocking bar operatively connected adjacent its ends to said cam followers; stop means intermediate the ends of said rocking bar for permitting said rocking bar to pivot when either cam follower is displaced by the corresponding cam and for preventing transverse translation of said rocking bar when either interrupter is closed and the corresponding cam follower is at said maximum displacement, whereby both of said circuit interrupters cannot be closed simultaneously, and means responsive to said maximum opening displacement of either of said cam followers for preventing opening of said fuse drawer.
Claim 7
Dependent Claim
88 words
An interlock in accordance with claim 3 wherein said means for preventing opening of said fuse drawer includes a member operable manually between a first position wherein said fuse drawer can be opened and a second position wherein it obstructs opening of said fuse drawer, and wherein said interlock also includes means responsive to said member being in said first position for preventing displacement of either of said cam followers by its associated cam, whereby neither of said interrupters can be closed when said fuse drawer is open.
Claim 8
Dependent Claim
84 words
An interlock in accordance with claim 3 between said pair of circuit interrupters and a plurality of drawout fuse drawers reciprocable in a common claim wherein said cams are eccentric and said cam followers are generally parallel elongated rods and are displaced longitudinally by said eccentric cams and are pivotally connected adjacent the ends of said rocking bar and also including means responsive to said maximum displacement of either of said cam follower rods for obstructing opening of said plurality of drawout fuse drawers.
Claim 9
Dependent Claim
125 words
An interlock in accordance with claim 5 wherein said means for obstructing opening of said plurality of fuse drawers is operable manually between a first position wherein said fuse drawers can be opened and a second position wherein opening thereof is obstructed, said cam follower rods have enlarged diameter portions and said interlock also includes means responsive to said fuse drawer obstructing means being in said first position for preventing displacement of either of said cam follower rods by its associated cam and including a reciprocable interlocking bar having keyhole opening receiving said cam follower rods, said enlarged diameter being greater than the width of the rectangular portion of said keyhole openings and less than the diameter of the circular portion of said keyhole openings.
Claim 10
Dependent Claim
109 words
The interlock of claim 3 between said pair of circuit interrupters and a plurality of drawout fuse drawers reciprocable in a common plane and including a plurality of mechanically ganged members operable manually between a first position wherein they prevent reciprocation of said drawers and a second position wherein said drawers can be reciprocated, and means responsive to said ganged members being in said second position for preventing displacement of either of said cam followers by its associated cam, said last-named means also being responsive to said maximum displacement of either of said cam followers for preventing movement of said ganged members from said first to said second position.
Claim 11
Dependent Claim
80 words
The interlock of claim 7 wherein each of said cam followers has an enlarged diameter portion and said means for preventing displacement of either of said cam followers includes said enlarged diameter portions of said cam followers and an elongated reciprocable interlocking bar having keyhole openings therein receiving said cam followers, said enlarged diameter being greater than the width of the rectangular portion of said keyhole openings and less than the diameter of the circular portion of said keyhole openings.
Claim 12
Dependent Claim
75 words
The interlock of claim 8 and including parallel crank linkage means operatively connecting said ganged members and said interlocking bar for reciprocating said interlocking bar between a position wherein said cam followers are in said circular portion of said keyhole openings when said ganged members are in said first position and a position wherein said cam followers are in said rectangular portion of said keyhole openings when said ganged members are in said second position.
Claim 13
Dependent Claim
82 words
The interlock of claim 9 wherein said ganged members are interfering arms rotatable about parallel shafts between said first position wherein they obstruct withdrawal of said fuse drawers and said second position wherein they do not interfere with withdrawal of said fuse drawers, and said parallel crank linkage means includes a connector rod affixed to said interlocking bar, and a plurality of first parallel crank arms pivotally connected at spaced points to said connector rod and operatively connected to said parallel shafts.
Claim 14
Dependent Claim
84 words
The interlock of claim 10 and including means for guiding said interlocking bar so that it can only reciprocate longitudinally, and wherein said parallel crank linkage means also includes a plurality of second crank arms each of which is affixed at one end to one of said parallel shafts and is pivotally connected at its other end to one of said first crank arms, whereby actuation of said ganged members between said first and second positions results in longitudinal movement of said interlocking bar.
Claim 15
Dependent Claim
71 words
The interlock of claim 8 wherein said operating members are rotatable shafts and said cams are eccentric and affixed to said operating members and including threaded adjusting means extending longitudinally of and affixed by screw threads to one end of said cam followers and engaging said cams for selectively changing the length of said cam followers, whereby the position of said rocking bar relative to said stop member may be adjusted.
Claim 16
Dependent Claim
49 words
The interlock of claim 12 wherein said cam followers are generally parallel elongated rods and are displaced longitudinally by said eccentric cams and also including means for resiliently urging said cam follower rods against said cams, and means for pivotally connecting said rocking bar to said cam follower rods.
Claim 17
Dependent Claim
48 words
The interlock of claim 8 wherein said cam followers are generally parallel elongated rods and are displaced longitudinally by said cams and also including means for resiliently urging said cam follower rods against said cams, and means for pivotally connecting said rocking bar to said cam follower rods.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |