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US3589503A Expired / Lapsed US ⏱️ 0.0 years remaining

Material handling conveyors

Assignee: Individual
•
Filing: 1969-06-09
•
Granted: 1971-06-29
•
Expires: 1989-06-09
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Abstract

Abstract The present invention relates to endless conveyors frequently used for carrying objects overhead and of the enclosed track type in which the track is a four-sided box in cross section usually square or slightly rectangular. The trolleys which run inside the track are alternately provided with vertical wheels and horizontal wheels considered when the track is running horizontally. Hooks extend from the vertical wheel trolleys through a slot formed usually in the bottom section of the track and support the objects conveyed. The horizontal wheels contact one or the other of the vertical sections of the track and eliminate excessive rubbing friction between the trolleys and the track. The horizontal wheel trolleys are provided with at least two horizontal wheels positioned one after the other or in tandem in the direction of the trolley travel for sequential contact with the track which on horizontal curves cause the ends of these trolleys to move away from the convex side of the curved track on the inside of the track, which action forces each vertical wheel trolley connected between two two-wheeled trolleys to be bodily moved away from and held out of contact with the convex side which eliminates all rubbing friction completely.

Inventors

  • 👤 John M Leach

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 13:13
CPC Classifications
B; B65; B65G; B65G17/00; B65G17/30; B65G17/38; B65G17/385; B65G2201/00; B65G2201/02

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 203 words
A conveyor comprising a track having in cross section approximately right angularly disposed trolley guide areas, said track also having curved sections, two rigid frame trolleys, two wheels carried at points spaced inwardly of the ends of the rigid frame by each of said trolleys and positioned in tandem for sequential contact with one of said track guide areas in the direction of trolley travel when said guide area makes a convex turn to guide said trolleys around said convex turn while positively moving both ends of the rigid frame of each of said trolleys away from the convex turn area, a third trolley disposed between adjacent ends of said rigid frames of said two aforementioned trolleys, at least one wheel carried by said third trolley to guide said third trolley along said track guide area which in cross section of the track is substantially at right angles to saId convex turn guide area, and an articulation connection between said adjacent ends of said rigid frames of said two first-mentioned trolleys and the ends of said third trolley, whereby the third trolley is moved away from and positively held out of contact with said convex turn area by said two first mentioned trolleys.
Claim 2
Dependent Claim 203 words
A conveyor comprising a track having in cross section approximately right angularly disposed trolley guide areas, said track also having curved sections, two rigid frame trolleys, two wheels carried at points spaced inwardly of the ends of the rigid frame by each of said trolleys and positioned in tandem for sequential contact with one of said track guide areas in the direction of trolley travel when said guide area makes a convex turn to guide said trolleys around said convex turn while positively moving both ends of the rigid frame of each of said trolleys away from the convex turn area, a third trolley disposed between adjacent ends of said rigid frames of said two aforementioned trolleys, at least one wheel carried by said third trolley to guide said third trolley along said track guide area which in cross section of the track is substantially at right angles to saId convex turn guide area, and an articulation connection between said adjacent ends of said rigid frames of said two first-mentioned trolleys and the ends of said third trolley, whereby the third trolley is moved away from and positively held out of contact with said convex turn area by said two first mentioned trolleys.
Claim 3
Dependent Claim 23 words
A conveyor as specified in claim 1 further characterized in that one of said track guide areas has a continuous slot extending therealong.
Claim 4
Dependent Claim 24 words
A conveyor as specified in claim 2 further characterized in that said third trolley is provided with a load support extending through said slot.
Claim 5
Dependent Claim 23 words
A conveyor as specified in claim 1 further characterized in that each of said two first-mentioned trolleys are longer than said third trolley.
Claim 6
Dependent Claim 25 words
A conveyor as specified in claim 4 in which each of said two first-mentioned trolleys is more than 50 percent longer than said third trolley.
Claim 7
Dependent Claim 77 words
A conveyor as specified in claim 1 in which said articulation connection is of the two, substantially perpendicular axis of articulation type in which the axes are mutually displaced and joined ends of the trolleys are overlapped so as to increase the effective length of all trolleys, which enables a guiding trolley always to move an adjacent nonguiding trolley further away from the convex guiding area than would be possible if the trolley ends were not overlapped.
Claim 8
Dependent Claim 21 words
A conveyor as specified in claim 6 further characterized in that a perpendicularly drilled joint block is positioned between adjacent trolleys.

References Cited (Backward Citations)

US2893540A Cited
US3266620A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-06-28 1974-12-28 1975-06-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-06-28 1978-12-28 1979-06-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-06-28 1982-12-28 1983-06-29 $7700.00 Window Closed / Lapsed

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