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Publication numberUS114782 A
Publication typeGrant
Publication dateMay 16, 1871
Publication numberUS 114782 A, US 114782A, US-A-114782, US114782 A, US114782A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in door-bolts
US 114782 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


. Improvement in Door-Bolts. No. 114,782. Pafente-dMay16,187l.


Letters Patent No. 114,782, dated. May It. 1871.-


The Schedule mien-ed to in these lletters Patent and making part of the same.

To all whom it may concern:

l3e it known that I, FEED. ENGELBRECHT, of Memphis,1 n the county of Shelby and State of Tennessee, have invented a new and useful Improvement in Doors Fastenings; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art'to make and use the same, referencebeing bad to the accompanying drawing forming part of this specification.

The figure is a side view of a pair of folding doors to which my improved fastening has been attached.

My invention has for its object to furnish a simple, convenient, strong, and efi'ective fastening for doors, which shall have greater strength and afford greater security than two locks, without rendering it necessary to carry around two large keys; and. e

' It consists in the construction and. combination of Ais the door-frame. B and O are the doors.

I) is an ordinary lock attached to the door B, and

the bolt d of which shoots into an open keeper, d,

attached to -the door 0.

E is a bolt attached to the upper part of l the door 0, and which shoots into a keeper, F, attached to the i door B.

G is a lever which is pivoted to the door 0, and the upper end of which is pivoted to the rear end of the bolt E by a 'pinor bolt passing through-a hole in the rear end of the said bolt E, and through a slot in the upper end of tbefsaid lever G. v

To the lower end of the lever G is rigidly attached an arm, g, which enters the keeper (1 of the look D, so that when thebolt d is pushed out-in locking the door it may strike against the rigid arm 9' of the lever G and push the lower end of said lever back, which moves the upper end of said lever forward, pushing the bolt E into its keeper F.

The lever G is pivoted below its middle point, so

that its upper end may move the bolt E through .a

greater-space than its lowerend is moved throughby the bolt (1 of the lock D, a

The lower side of the boltE isno'tcbed to receive the upper endof the lock-bolt H, which is heldup in proper position to. receive and catch upon the said bolt E, as itis pushed forward, by the spring I, one

end-of which is attached to the door B, and its other,

or free end presses against'the lower end of said bolt H. 4 The bolt H is drawn back to release the bolt E by a small key, the guard of which strikesagainst a projection formed upon or attached to the side of said bolt H, as shown in the figure.

J is a spring, one end of which is attached to the door 0 and its other or free end presses against the lever G-above the' pivot-ingpoint, so as soon as the bolt E is released from the catch-bolt H and the look D is unlocked to draw the said bolt'E out of the keeper E'and unfasten the door.

By this construction, as the lock D is looked its bolt d forces the lower end of the lever G back, which forces the bolt E forward soas to be caught and held by the catch-bolt H, so that, should the look D be unlocked the bolt E would still beheld by the said bolt H ,until said bolt His withdrawn, allowing the --bolt E to be draw'n back-by the action of the spring J.

I claim as new and desire to secure by Letters 1 L ent- The pivoted-'spring-lever G g J, notched bolt E, and

spring lock-bolt H I, combined, as described, with the lock D d d", for the'purpose-specified;

The above specification of my-in'vention signed by me this of March, 1868. FEED. EN GELBREOHT.

Witnesses 011s. A. DAMMANN, W nH. GLANTZEB.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3388938 *May 20, 1966Jun 18, 1968Francis C. PetersonCabinet door latch
US4582381 *Aug 28, 1984Apr 15, 1986International Business Machines CorporationElectrical interlock
Cooperative ClassificationE05B63/14, Y10S292/18, Y10S292/21