Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS775402 A
Publication typeGrant
Publication dateNov 22, 1904
Filing dateJul 30, 1904
Priority dateJul 30, 1904
Publication numberUS 775402 A, US 775402A, US-A-775402, US775402 A, US775402A
InventorsDwight A Hitchcock
Original AssigneeThomas H Simpson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Actuating device for swinging doors of reight-cars.
US 775402 A
Previous page
Next page
Description  (OCR text may contain errors)

No. 775,402. PATENTED NOV. 22, 1904.





UNITED STATES Patented November 22, 1904..




SPECIFICATION forming part of Letters Patent No. 775,402, dated November 22, 1904.

Application filed July 30, 1904. Serial No. 218,829. (No model.)

To all whowt it may concern.-

Be it known that I, DWIGHT A. HI'roHoooK, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Actuating Devices for Swinging Doors of Freight-Cars, of which the following is a specification, reference being bad therein to the accompanying drawings.

The invention relates to an improved actuating device for swinging doors of freightcars, and particularly for that class of swinging doors which are used in hopper-bottoms or dump-cars.

The invention consists in the construction, arrangement, and combination of parts, as more fully hereinafter described, and particularly pointed out in the claims.

In the drawings, Figure 1 is a vertical section through the lower part of the body of the car, showing the swinging doors and the actuating devices therefor. Fig. 2 is a plan view of the car-bottom, show'ing partially in dotted and partially in full lines the actuating mechanism in different positions. Fig. 3 is a longitudinal section showing in full and dotted lines the different positions of the parts. Fig. 4 is a detail elevation illustrating the lock for the crank-shaft.

My improvement is shown as applied to a form of actuating device for car-doors which is described in United States Letters Patent No. 686,902, of November 19,1901, and the parts described in that patent are the car-body A, having a double hopper-bottom and having the doors B B for opening and closing the discharge from the hoppers. The doors are opened and closed by means of the reciproeating actuator-bar O,which has connected to opposite sides the arms D, these arms being connected at their inner ends to the actuatorbar and at their outer ends to the doors and are adapted to be moved to close the door by being moved into their straight horizontal position (shown at E in Fig. 2) or by opening the door, as shown in their oblique position in Fig. 2.

G is a crank-shaft journaled transversely of the car and having a crank-arm H at its inner end, which has awrist or crank pin I engaging a link J, which in turn is connected to the actuator-bar C.

When this device is in use, the car being loaded with ore or coal, for instance, if the operator turns the crank-shaft and unlocks the car-doors the weight resting thereon will tend to revolve the crank-shaft very rapidly, and there is grave danger that the operator may be seriously injured. Many efforts have been made to overcome this difiiculty, and my improvement is designed to and does obviate this danger and makes it quite safe for the man to open the doors when the car is loaded.

I lengthen the link J, and in the extension thereof I form a slot K, which the pin or wrist I engages. When the door is to be shut and locked, the crank H is turned at the right hand, Fig. 3, and that will move the actuatorbar C from the position shown in dotted lines to the position shown in full lines, the wrist I being at the right-hand end of the slot K. To unlock the doors, the crank H is turned to the left, as shown in dotted lines, Fig. 3, and it first travels the whole length of the slot-K before it begins to actuate the link J. When it has reached the end of the slot, the further movement of the crank will draw with it the actuator-bar O, and then when the load upon the doors forcibly opens them the link will travel upon the crank-pin I without actuating it, as shown in dotted lines at the left hand of Fig. 3.

It will be understood that the actuator-bar O is supported upon suitable links L and that I may provide the suitable lock for the crankshaft by placing on the outer end thereof a toothed wheel M, with which the pawl or dog N is adapted to engage, and I may also provide the locking-cam O to positively hold the dog in engagement with the wheel, so that it may not become accidentally unlocked during the travel of the car.

What I claim as my invention is 1. The combination with a car, of a swinging door, an oscillatory operating-bar, hori- Zontally-swinging arms engaged at their inner ends with the bar and at their outer ends with the door, and means for actuating the the door, a slotted link connected to the bar, and an operating crank-shaft having its crank engaging the slot in the link, for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3343725 *Jun 9, 1965Sep 26, 1967Hoover Ball & Bearing CoBottom discharge bin
US3581672 *Dec 27, 1968Jun 1, 1971Pullman IncHopper closure actuating and latching mechanism
US3596608 *Nov 20, 1968Aug 3, 1971Pullman IncHopper door actuating mechanism
US4077329 *Jul 19, 1976Mar 7, 1978Pullman IncorporatedOpening and closing means for hinged trough covers on hopper cars
US4194450 *Dec 27, 1977Mar 25, 1980Pullman IncorporatedRailway hopper car door operating mechanism
US6955126 *Oct 29, 2004Oct 18, 2005Taylor Fred JRailroad hopper car longitudinal door actuating mechanism
US7681507May 4, 2006Mar 23, 2010Trn Business TrustRailcar with discharge control system
US7735426Oct 17, 2006Jun 15, 2010Trinity Industries, Inc.Hopper cars with one or more discharge control systems
US7891304Jun 12, 2008Feb 22, 2011Trinity Industries, Inc.Railcar with discharge control system
Cooperative ClassificationB61D7/26