Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
In an electrically operated transport vehicle system, the combination comprising: a ground conductor, sensing circuit means including an inductive reactance element for providing magnetic circuits, movable contact means providing spaced apart physical and electrical contact elements engageable with said ground conductor and adapted to be moved along said ground conductor, said movable contact means providing a safety ground connection of the transport vehicle with said ground conductor, means for operatively connecting said sensing circuit with said movable contact means to change the state of the magnetic circuits within said sensing circuit when a break in continuity is sensed between said ground conductor and said contact means, and indicator means responsive to said sensing circuit means to indicate that an ungrounded condition exists.
Claim 2
Dependent Claim
122 words
In an electrically operated transport vehicle system, the combination comprising: a ground conductor, sensing circuit means including an inductive reactance element for providing magnetic circuits, movable contact means providing spaced apart physical and electrical contact elements engageable with said ground conductor and adapted to be moved along said ground conductor, said movable contact means providing a safety ground connection of the transport vehicle with said ground conductor, means for operatively connecting said sensing circuit with said movable contact means to change the state of the magnetic circuits within said sensing circuit when a break in continuity is sensed between said ground conductor and said contact means, and indicator means responsive to said sensing circuit means to indicate that an ungrounded condition exists.
Claim 3
Dependent Claim
124 words
The electrically operated transport vehicle system according to claim 1 wherein said inductive reactance element includes a transformer having first, second and third magnetic circuit portions, said first magnetic circuit portion receiving an excitation voltage for producing magnetic circuits within said transformer, said second magnetic portion receiving a load winding responsive to the magnetic circuit associated therewith for producing an output voltage, and said third circuit portion receiving a short circuit loop which is connected to said contact means for providing a high magnetic impedance of said second magnetic portion when said short circuit loop is in a closed loop condition, and for providing a low magnetic impedance of said second magnetic portion when said short circuit loop is in an open circuit condition.
Claim 4
Dependent Claim
76 words
The electrically operated transport vehicle system according to claim 2 wherein said load winding is connected to a conductive switching element for operating the same during conditions when said closed loop path is maintained, said current conductive means operatively connected to said indicator means to maintain said indicator in an off condition when said short circuit loop is maintained closed and automatically to render said indicator means operative when said short circuit loop path is opened.
Claim 5
Dependent Claim
130 words
The electrically operated transport vehicle system according to claim 1 wherein said reactance means includes a magnetic frame providing two spaced apart magnetic circuits, each magnetic circuit having a common leg therebetween, An excitation winding positioned on said common leg for inducing magnetic flux paths through said two spaced apart magnetic circuits, a load winding connected to one of said two spaced apart magnetic circuits outwardly of said central portion for providing an output voltage sufficient to energize a transistor circuit when the impedance of the other of said two spaced apart magnetic circuits is maintained in a high state, and disconnection of said movable contact means with said ground conductor will cause a change in impedance of said magnetic circuit automatically to indicate the absence of a safety ground.