Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
Improvement in handling conveyors moving in level and offlevel zones and equipped with self-propelled trolleys driven by means of two linear induction motors each including a field mounted on one of the side walls of each trolley and fed by a set of contacts adapted to slide on electric supply lines, and an armature mounted on the corresponding side wall of the conveyor, the two sets of contacts being spaced by a predetermined distance longitudinally of the trolley, comprising the steps of: a. replacing, in the off-level zones of the conveyor, said electric supply lines by auxiliary lines connecting the terminals of said field to variable impedances, and said armature by an auxiliary field which is placed along said offlevel zones and fed by an a.c. voltage source, so as to form an auxiliary linear motor having a variable speed and an increased power, and in which the regular field of the trolley now acts as a wound armature; and b. spacing, in the area of the off-level zones, the armature and the auxiliary field mounted on the side wall of the conveyor as well as the electric supply lines and the auxiliary lines by a gap slightly longer than the distance between the two sets of contacts.
Claim 2
Dependent Claim
208 words
Improvement in handling conveyors moving in level and offlevel zones and equipped with self-propelled trolleys driven by means of two linear induction motors each including a field mounted on one of the side walls of each trolley and fed by a set of contacts adapted to slide on electric supply lines, and an armature mounted on the corresponding side wall of the conveyor, the two sets of contacts being spaced by a predetermined distance longitudinally of the trolley, comprising the steps of: a. replacing, in the off-level zones of the conveyor, said electric supply lines by auxiliary lines connecting the terminals of said field to variable impedances, and said armature by an auxiliary field which is placed along said offlevel zones and fed by an a.c. voltage source, so as to form an auxiliary linear motor having a variable speed and an increased power, and in which the regular field of the trolley now acts as a wound armature; and b. spacing, in the area of the off-level zones, the armature and the auxiliary field mounted on the side wall of the conveyor as well as the electric supply lines and the auxiliary lines by a gap slightly longer than the distance between the two sets of contacts.
Claim 3
Dependent Claim
51 words
An improvement according to claim 1, wherein the gaps associated with each trolley auxiliary linear motor and located on opposite walls of the conveyor are offset from one another in the direction of travel by substantially twice the trolley length, whereby continuous driving and braking of the trolley can be provided.
Claim 4
Dependent Claim
27 words
An improvement according to claim 1, wherein the auxiliary field is also disposed in a level zone for improved retarding and starting of trolleys in such zone.
Claim 5
Dependent Claim
64 words
An improvement according to claim 1, wherein to equalize the speed of a number of trolleys disposed in any conveyor zone, only identical kinds of wound-armature auxiliary motors are used in such zone, the fields of such motors being connected in parallel to the same voltage source, the wound armatures of such motors being connected in parallel to a common system of variable impedances.