Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
222 words
In a rack and pinion lift system, comprising a lift car, electro motor means for driving said car along a lift mast via rack and pinion means, a control unit in said car with a control buttons set including floor call buttons, call button units on landings along said mast, means connecting said call button units to said control unit via a ground level unit, the improvement comprising (A) sensor means associated with said lift car having means for sensing passage of teeth of said rack and pinion means and producing corresponding position impulses representative of the position of said lift car along said mast (B) a micro computer system comprising (a) a programmable micro computer unit in said lift car with means for receiving said position impulses, register means for position impulse numbers based upon said position impulses and representative of the positions of landings, means for collecting and storing call impulses from said call button units and destination impulses from said control button set, and output and control means for controlling operation of the electric motor as determined by received call and destination impulses. (b) a second micro computer unit associated with said ground level unit having means for scanning said call button units with respect to their state and sending corresponding call impulses to said programmable micro computer unit.
Claim 2
Dependent Claim
222 words
In a rack and pinion lift system, comprising a lift car, electro motor means for driving said car along a lift mast via rack and pinion means, a control unit in said car with a control buttons set including floor call buttons, call button units on landings along said mast, means connecting said call button units to said control unit via a ground level unit, the improvement comprising (A) sensor means associated with said lift car having means for sensing passage of teeth of said rack and pinion means and producing corresponding position impulses representative of the position of said lift car along said mast (B) a micro computer system comprising (a) a programmable micro computer unit in said lift car with means for receiving said position impulses, register means for position impulse numbers based upon said position impulses and representative of the positions of landings, means for collecting and storing call impulses from said call button units and destination impulses from said control button set, and output and control means for controlling operation of the electric motor as determined by received call and destination impulses. (b) a second micro computer unit associated with said ground level unit having means for scanning said call button units with respect to their state and sending corresponding call impulses to said programmable micro computer unit.
Claim 3
Dependent Claim
38 words
A system according to claim 1, in which a power cable leading from said ground level unit to said lift car is used as communication means between said programmable micro computer unit and said second micro computer unit.
Claim 4
Dependent Claim
33 words
A system according to claim 1, wherein the programmable micro computer unit includes programming means enabling re-programming of said register means in case of change of the number and positions of the landings.
Claim 5
Dependent Claim
15 words
A system according to claim 3, wherein said re-programming means includes a programming pushbutton set.
Claim 6
Independent Claim
93 words
A system according to any of claims 1-4, wherein the programmable micro computer unit includes registers for the number of teeth of said rack and pinion means before a landing where the lift car shall change speed from full to low, for the number of teeth before a landing that corresponds to stop distance, and for the number of teeth corresponding to maximum allowed brake distance, there being arranged that if the last-mentioned number of teeth is exceeded the lift shall make an emergency stop and error indication for brake error be given.
Claim 7
Dependent Claim
31 words
A system according to claim 1, wherein said programmable micro computer unit includes a register for service intervals in number of hours, and means for indicating when such service is due.
Claim 8
Dependent Claim
32 words
A system according to claim 2, wherein the communication via the power cable is carried through by means of capacitive transmission with a loop via two phase leaders of the power cable.
Claim 9
Dependent Claim
28 words
A system according to claim 1, wherein the sensor device includes two inductive sensors for sensing passage of teeth and spaces, respectively, of said rack and pinion means.