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Publication numberUS1737414 A
Publication typeGrant
Publication dateNov 26, 1929
Filing dateApr 21, 1926
Priority dateApr 21, 1926
Publication numberUS 1737414 A, US 1737414A, US-A-1737414, US1737414 A, US1737414A
InventorsParis R Forman
Original AssigneeNat Pneumatic Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Door lock
US 1737414 A
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Description  (OCR text may contain errors)

Nqv. 26, 1929. .P. R. FORMAN DOOR LOCK Filed April 21, 1926 2 Sheets-Sheet n 2 E. R a mm m. m a v 1 9 2 m MANUALLY OPERATED TH REE. WAY VALVE Y Nov. 26, 1929.



This invention relates broadly to door locks.

One of the objects of the invention is the provision of a novel lock structure for use on the doors of vehicles, especially cars, such as are used by railways.

One of the objects of theinvention is the provision of a lock adapted to be used in connection with the axle generator of vehicles.

One of the objects of the invention is the production of a lock which is adapted to maintain the door locked during the motion of the vehicle to which it is applied but which may be opened by means of a special key by r the conductor when he so desires.

A still further object of theinvention is to provide a lock for vehicle doors which is adapted to be free for opening when the vehicle is at a standstill.

A still further object of the invention is the provision of a lock structure which is adapted to be maintained locked when the car is not in motion when this is desirable.

The invention resides substantially in the r construction combination arrangement and relative location of parts, all as will be more fully indicated in the following specification. These and other objects, as will appear in the following description, are obtained by means of the construction shown in the figures of the drawings,'in which the same reference numerals will be used throughout to indicate the same or similar parts. l

parts broken away, for purposes-of illustration of my novel lock structure.

F ig. 2 shows a side elevational View of this look. If

Fig. 3 is a view of my lock structure as ap'} plied to the framework of a vehicle looking down on the device.

arrangement of the lock in connection with the axle generator and Fig. 1 shows a top plan view with some I 1926. Serial Nb. 103,437.

Fig. 5 is an enlarged detailed view showing a modification of the device. Fig. '6 is a diagrammatic arrangement showing the use of either a battery or the axle generator and a method of controlling more than one lock at a single point.

Fig. 7 shows the same arrangement as Fig.

6, but applied to one lock magnet only. In Fig. 1, the casing 1 and cover 5v are shown. The casing, which contains the lock structure, is shown in'Fig. 3 attached to the vestibule framework of. the vehicle in cooperative relation with the door 2 of the vehicle, on which is mounted the member 4 for receiving the latch bolt. This device is particularly adapted for use with doors of the cylindertype such as are found on vehicles and which are adapted to be opened before the trap door is lifted.

Within the casing 1' is shown an inlet coupling 6 to which is connected the conduit for enclosing or protecting the lead wires which are to be connected to the terminals 7 within the casing. Wires are led from these terminals to the electro-magnet 8 in the usual and well known. manner. The electro-magnet 8 is mounted within the casing on a suitable bracket adjacent the support 9 forming part of the casing on which is pivoted a short armature 10 adapted to rest in its normal position against the stop 11. Mounted on a transverse shaft 12 journalled in, the casing and cover is a handle 13, and keyed to the shaft within the casing is a lever 14 having a small projecting end 14:. Abovethe magnet 8 is mounted the rod 16 having at one end a short plate 15 and on its other end the latch bolt 17 The rod 16 slides in a bracket 16 at one end, and at the other the latch bolt 17 slides through an opening in the casing and maintains the bolt 17 extended through the casing I 1. At the upper end of the casing is pro Fig. 4 is a diagrammatic view of the clrcuit vided an opening 19 to receivea key which operates the short lever 18.

As is shown in Fig. 4, the electro-magnet 8 is connected in series with the axle generator 27 which is of the usual type found on the axle of each car comprising a train, and is adapted to generate electricity whenever the car is in motion. Thus it will be seen that whenever the car is moving, the electro-inagnet 8 will be energized and the armature 10 will rest upwardly against the core of the magnet so as to be in the path of the projection 14 on the lever 14. Thus it will be impossible to move the handle 13 to the right (Fig. 1) to withdraw the latch bolt 17. By this arrangement, it will be seen that a pas senger will be unable to unlock'the door of the vehicle while the train is in motion. Thusby this arrangement possible injury to a pas senger who might otherwise open the door will be prevented. In case the conductor should desire to open the door for any reason, he may insert the proper key in theopening lihand by rotating the. lever 18 to the left, withdraw thelatch bolt so that the door may be opened even though. thetrai-n is in motion. It willyalso be evident that as soon as thegtraia i comes to a standstill the armature. 1Q wi-llreturn to its position against thestop; 1.1, that,

the handle 13 may be. operated to withdraw the latch bolt. 5 g

I have shown a modification in Fig. 5 by '30 means of which it is possible to maintain the doors locked even though the train isnot in motion, To the lock structure as disclosed above may be added a small cylinder 20 having monnted therein piston 2 1jwhich may be. forced upwardly against the action'o-f the spring 22 when airpressure is supplied in v backof the piston through the pipe 23. A small rodv projecting through the casing and attached to the piston may cooperate with the end. of the armature 10 to force it upwardly sothat thelower, end. of the lever 14 maynot be moved to the right becauseit is. set against a projection on the arm 10. Fluid pressure from any suitable'source,either the braking system, orthefluid pressure source used for supplying water to the basins in the vehicle wash rooms will be supplied by the pipe 26 tothe valve 24 which. in one position will supply fluid pressure to the pipel23 and in its other position may exhaust the fluid: pres surefrom the cylinder 20 through the pipe 25. Thus it will be seen that the doors may be maintained in locked; position even when the vehicleis at rest whenfthis isdesirable."

It is, of course, possible to apply this in vention. to a vehiclefhavingl both an axle. gen.- erator and a battery,as shown in Figs; 6 and 7, This canbeaccomplished in one formby means of a double pole, double throw switch adaptedin oneposition to connect the magnet 8 to the. axle generator and in the other t0,a battery orother current source 52, By this arrangement, the invention can be adapted to lock thedoors ona vehicle, should in). the generatorgo bad, or tolook the doors by ator 27 or the battery 52. Thus the doors may be locked when the vehicle is at rest or V in motion, either by the pneumatic; means or by the electro-magnetic means, using either current source. 1

- It is evident from-the foregoingdescription that I have provided a novel lock-'particularly adapted for use on vehicles supplied with axle generators. I do not, however, de sire to be limited to, the particular embodiments of the invention shown in the drawings, but rather to the scopeand spirit of my invention as defined in the -appended claims I am well aware that, many changes in the details. of construction and; arrangement'of parts ay readily suggest hem elve to one skilled in the art. Thu's'flfdesired, only one axle generator could be used, and all, the'electrormagnets could; beconnec'ted in series; and the single valve 24in themodi'fication of Fig. 5 might be arranged to control the pistons associated with any number of locks Having. now described my invention What I seek o c re. ay-Uni ed. States. Letters Patentisz 'j 1. In a vehicle door safety 'liocltfthe combination with a vehicle havingdoors thereon, of ep ate electrical. meanscn-ca hdoor. er rendering the doors normally locked when the vehicle is in motion, and. separate'pneumatic means associated witheanhogf said electrical means, -to lock the ,doors Whether the vehicle is in motion or not.

2. In a vehicle door safety lock the combinationwith a vehicle havingdoors'thereon and an axle generator, of electrormagnetic means connected to said generator for locking said doors when the vehicle is in motion, a

and manually controlled pneumatic means for locking the doors.

,3. In a vehicle doorsa fety lock the combination, with a vehicle'having doors thereon and an axle generator, of a bolt for'normally engaging a door when closed,electro-"magnetic means for preventi ng'the movement of the bolt, said means being connected t-o the-gen,- erator to prevent'movement of the bolt when the vehicle is in. motion, manual means: for

moving said bolttwhen the vehicle-isin motion, and manually controlled pneumatic means for preven ng;themc m n QztF a bolt whetherthe vehicleis stationary or not.

4. In a vehicle door saiety lock; thecomibination with, a 'vehiclehaving doors thereon and an axle driven generator, of. means connected to the generator for'locking the doors when the vehicle is in motion, manual means for operating said first mentioned means when the vehicle is stationary, said first mentioned means being rendered operative While the vehicle is in motion to lock the doors against operation by said manual means, and manually controlled pneumatic means for locking the doors when the vehicle is stationary or in motion.

In testimony whereof I have hereunto set my hand on this 19th day of April, A. D.,


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4665727 *Dec 30, 1985May 19, 1987Alan K. UyedaManually operated lock mechanism for bypass of customer operated electronic digital safe lock
U.S. Classification105/395, 70/465, 292/DIG.650, 70/145, 70/279.1
International ClassificationE05B65/42
Cooperative ClassificationY10S292/65, E05B77/54
European ClassificationE05B77/54