Searching over 5,500,000 cases.

Buy This Entire Record For $7.95

Download the entire decision to receive the complete text, official citation,
docket number, dissents and concurrences, and footnotes for this case.

Learn more about what you receive with purchase of this case.

Elevator Supplies Co. v. Graham & Norton Co.

October 6, 1930


Appeal from the District Court of the United States for the District of Delaware; Hugh M. Morris, Judge.

Author: Woolley

Before BUFFINGTON and WOOLLEY, Circuit Judges, and SCHOONMAKER, District Judge.

WOOLLEY, Circuit Judge.

The bill charges the defendant with infringing certain claims of Re-issue Patent No. 13,932 to Wylde & Schenck and all claims of Letters Patent No. 1,105,053 issued to the same inventors. The District Court, having found the re-issue patent not infringed and the second patent invalid, dismissed the bill. 33 F.2d 146. The plaintiff appealed.

The inventions of the patents in suit relate to satety devices on elevators, particularly on passenger elevators.

The art know from experience that certain dangers lurk in high speed elevator operations and that elevator passengers develop, consciously or unconsciously, a habit of doing very foolish and very dangerous things. It sought by various devices to reduce the dangers inherent in elevator operations and to protect passengers from themselves. Accordingly devices were invented to prevent the starting of the car until the door is closed, or nearly closed, of which the invention of the second patent in suit is an example; and devices to prevent an unauthorized reopening or pushing back of the shaftway door on its closing movement and before it is entirely closed, and thus to prevent passengers from "rushing the door" and suffering the consequences of that very positive danger, in which class the device of the first patent falls.

Wylde & Schenck Re-issue Patent No. 13,932, Issued June 15, 1915.

The patent is for a "door controlling device." It provides mechanism for two main purposes; one, to open a shaftway door; the other, to close it and, particularly, to prevent it being reopened or pushed back when it is on its reverse closing movement, and incidentally to lock the door when finally closed. We shall assume that the device involves invention. On this assumption we necessarily must also assume that the invention is a combination, not an aggregation. While this is debatable because the device, by its several parts, performs one function in opening and closing the door and an entirely different and unrelated function in providing against pushing open the door on its reverse or closing movement, it follows necessarily, on our double assumption, that the structure is unitary, having dual functions to meet dual requirements which arise out of one problem.

The device consists of a toggle whose levers are employed as means for opening the door and for closing the door and, to a limited extent, for locking it. One lever of the toggle is mounted on the door at about midway its height and is manually operated by a handle also mounted on the door, which, when operated, breaks the aligned levers of the toggle and permits the door to be shoved back or opened, at the same time compressing a spring in a power chamber. The reverse movement of closing the door is effected by the release of the spring and the straightening out of the toggle levers which when fully straightened fasten and lock the door, for obviously the door cannot open solong as the levers or arms of the toggle remain rigidly straight. The mechanism for these purposes was old. Wylde & Schenck invented nothing new to produce these results. But they added to and connected with this mechanism two members known as wheel 11 and cam 14 placed on the handle at the end opposite that of the handhold. The wheel is grooved and the cam is so positioned in respect to the wheel that on opening the door by breaking the toggle the cam slips by the groove of the wheel and nothing happens. But if, on the reverse movement, that is, on the movement of the door towards its closed position, an attempt be made to push it back, the cam moves into the groove of the wheel and jams, thus preventing a reopening movement and safeguarding anyone trying to rush the door. Also, when the door is completely closed these elements hold the levers of the toggle immovable in their straightened position.This is the new or second part of the unitary mechanism which when called into play performs a distinct function that has no relation to the function of the toggle in opening and closing the door. This part is simply housed in the tggle and handle mechanism. Yet as the two parts are joined in one organization and together form one instrumentality, we have assumed, against the defendant's contention, that they are closely enough related to be a combination.

When Wylde & Schenck applied for a patent for this invention, the Patent Office rejected claim 4 on Berger, No. 503,782 and called for amendment of claim 3 because of fear of Fisher, No. 525,682. The applicants amended both claims (the two now here in suit) by adding these limitations: door mechanism "comprising a toggle one member of which is attached to the door and the other to a relatively stationary part, and a movable member mounted on the door and adapted to break the toggle and open the door"; and means "comprising two parts freely moved past each other but adapted to engage on a reverse movement of the door from any one of a plurality of points during the latter part of the closing movement of the door" for checking a reverse movement of the door when being closed.

These are limitations imposed by the Patent Office and voluntarily accepted by the applicants. They are not now to be read out of the claims or be given a meaning broader than was then intended. I.T.S. Rubber Co. v. Essex Rubber Co., 272 U.S. 429, 47 S. Ct. 136, 71 L. Ed. 335; Yates v. Smith (C.C.A.) 271 F. 33. With this statement of the invention and limitations of the claims we turn to the alleged infringing device.

The defendant says it is a plain aggregation of prior art elements. And we think it is. The defendant took the old toggle of the Norton patent, No. 773,413 granted in 1904 for opening and closing a shaftway door. Similar toggles for the same purpose are found in Jenkins, No. 518,408; Harkness, No. 553,807; Payne, No. 839,314 and Voight, No. 1,028,833; ranging from 1894 to 1912. These toggles with their door opening, door closing and door locking functions were, of course, just as free to the defendant as to Wylde & Schenck.

What next did the defendant do? It found that, while the wheel and cam of the Wylde & Schenck device with their jamming action are, on paper, a rather ingenious device, it has no proved advantages for it has never been used and it has certain suspected disadvantages. At all events, the defendant did not want it and has not used it. For its purpose of arresting or preventing an unauthorized and dangerous opening of a closing door, the defendant found and used as a more practical means the pawl and ratchet of the prior art which, though shown in Berger, No. 503,782; Fisher, No. 525,682; Herdman, No. 557,204 and Tobey, No. 762,455; ranging from 1893 to 1904, the plaintiff says is the equivalent of the invention of the patent in suit.

The pawl in the defendant's device is suspended from the bottom of the door and co-acts with a ratchet in the floor. In the opening movement it simply slides over the teeth of the ratchet. In the reverse or closing movemnt the pawl, on any attempt to push back the door, will catch in the teeth of the ratchet at points predetermined by their position. In the ratchet of each of two of the alleged infringing devices there was one tooth and in the ratchet of the third, three teeth. This, clearly, is not within the terms of the amended claims providing for an arrested movement at "any one of a plurality of points." Nor does it involve mechanism of "parts freely moved past each other." To apply that term to a pawl and ratchet, an ancient instrumentality in many arts, does not import invention. The toggle mechanism and arresting movement mechanism in the defendant's device do not come in contact not do they have any relation to each other. They are as far apart on the door as they were in the art. They are not co-acting parts as in Wylde & Schenck but are separate and distinct structures, functioning separately and differently. The pawl and ratchet function in the old way however the door is opened and closed and the toggle functions in the old way whether there is an arresting pawl and ratchet on or off the door; whereas in Wylde & Schenck the toggle functions in the old way to open the door and also to close and lock it, but is aided by the new parts to secure it in locked position. The toggle of the patent, with one member mounted on the door, is the carrier of the arresting mechanism. In the defendant's device the arresting parts (without any final locking function) are carried not on the toggle but on the door and the floor. Moreover, the defendant's construction is not one which by engagement of the pawl and ratchet prevents a reverse movement at "any one of a plurality of points." It prevents it at only one or three predetermined points just as a pawl will always prevent movement according to the number and location of teeth in the ratchet. That is its common function. ...

Buy This Entire Record For $7.95

Download the entire decision to receive the complete text, official citation,
docket number, dissents and concurrences, and footnotes for this case.

Learn more about what you receive with purchase of this case.