Stop devices for overhead conveyors

• US 4,062,428 A
• Filed: 11/24/1976
• Issued: 12/13/1977
• Est. Priority Date: 12/23/1975
• Status: Expired due to Term

• Current Assignee: FATA European Group SPA
• Original Assignee: Fata S.p.A. (SIND International SPA)
• Inventors: Di Rosa, Gaetano
• Primary Examiner(s): Reger, Duane A.
• Application Number:
  US05/744,554
• Time in Patent Office: 384 Days
• Field of Search: 188/1 B, 188/85, 188/266, 188/271, 188/275, 188/284, 188/286, 74/821-823, 193/35 A
• US Class Current: 188/275
• CPC Class Codes: B61B 10/025 Coupling and uncoupling means between power track abd vehicles
• CPC Class Codes: B61K 7/16 Positive railway stops

Abstract

A blocking device for an overhead conveyor having a combined limit stop and shock absorber which acts to define the end positions of a drive device which moves the blocking device between an operative and an inoperative position. The combined shock absorber and limit stop device comprises a body having two parallel plungers sliding in parallel bores of the body, the bores being linked at their closed ends by a passage having a restrictor throttle therein, the interior passage and the chambers are filled with oil which, upon its passage through the restrictor throttle, when one of the plungers is depressed, dissipates energy causing the depression and also serves to push out the other plunger ready for a subsequent depression when the device moves from one position to the other.

Claims

1. A combined shock absorber and limit stop device for a driven shaft which is adapted to be rotated about 180°

in opposite directions comprising a driven shaft having a radially extending projection secured thereto for engagement with said combined shock absorber and limit stop device and means for driving said shaft in opposite directions, said combined shock absorber and limit stop device being disposed adjacent said shaft and comprising first and second parallel plungers disposed orthogonally to said shaft with each plunger having an end disposed substantially diametrically opposite the end of the other plunger for engagement by said projection, housing means defining first and second plunger chambers within which said first and second plungers are slidable respectively between first and second end positions, a conduit interconnecting said first and second chambers, a restrictor throttle in said conduit to restrict the flow of a fluid between said chambers and means for limiting the movement of said plungers in opposite directions between said first and second end positions.