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 numberUS1010365 A
Publication typeGrant
Publication dateNov 28, 1911
Filing dateJul 18, 1911
Priority dateJul 18, 1911
Publication numberUS 1010365 A, US 1010365A, US-A-1010365, US1010365 A, US1010365A
InventorsGeorge Hensle
Original AssigneeGeorge Hensle
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Burglar-proof attachment for doors.
US 1010365 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)



Patented Nov. 28, 1911.



Specification of Letters Patent.

1911. .Serial llo. 639,171.

States of America, have invented certain new and useful Improvements in Burglar-Proof Door Attachments, of which the following is a specification.

My invention relates to burglar-p vide a simple and inexpensive device which may be readily attached to doors for effectively preventing opening a door by jimone of its ends, against which the door mying.

I will describe my invention in the following specification and point out the novel features thereof in the appended claim.

Referring to the .'drawings, Figure 1 is a sectional plan view of a door casing and a swinging door with a' spring latch and with my novel attachment shown thereon. Fig. 2 is a similar view of the end portion of the door and a part of its casing with a modified form of .my invention shown in conjunction therewith. Another modification of the inventionis illustrated in a similar view in Fig. 3. Fig. 4 is a perspective view of the two parts of my attachment, and in Fig. 5 a still further modification is illustrated.

Like characters of reference designate cor responding parts in all of the figures.

10 designates a. door which is hinged at 11 to a casing 12. On this door is shown an ordinary sprmg latch 13.

20 is a metallic plate or door fixture which is provided with a slot 21. This plate in Fig. 1 is shown. under the-latch 13 and affixed to the door by the screws which hold the latch in place. 22 is another plate which is to be afiixed to the door casing on the side opposite the hinges 11 and in line-with the door fixture plate 20. This casing fixture is preferably constructed with a shoulder 23 projecting at right angles from abuts when closed; and with another shoulder 24- projecting at ri ht angles from its opposite side to aid in fastening it securely to the door casing. Its other end 25 is somewhat narrower and is so designed and arranged that it will project through the slot 21 in the Application filed July 18,

of the door latch.

Before specifically describing the other figures of the drawings I will point out the portion of this form of my invention. The two plates are afiixed to the door and to the door casing, respectively. When the Patented Nov. 2%, 32ftfor the reception of the sliding bolt or catch I door is closed the end 25 of plate 22 will,

. project through the slot 21. This end of roof at tachments for doors and its object is --to.;pr}o;-;-

\ 'catch of which will enter the casing fixture will then act .as a strik ing plate iort the slot 26 and ne springlatch, the bolt or holdthe.;do0r closed. Now, if an attempt is made toforce the door away from the casing on the unhinged edge of the door by inserting a jimmy or other pry, these attachments will prevent such an operation because the end 25 of the plate 22 cannot move longitudinally in respect of the plate 29 on the door. The shoulder 23 insertion of a jimmy or other tool at the prevents the latch. If a prying pressure is applied sufiicient to bend the end of the casing fixture plate, the attachments will still prevent the releasing of the door latch because that portion of the plate which engages the latch will then be forced farther on to thedoor latch, bolt or catch.

The common form of spring latch-which is shown is only chosen as illustrative of the invention, and it is to be understood, of

course, that any form of latch or look may 13' is shown with anthe reception of the end 25 of the door casing fixture. In this case no plate 20 is required, butthe operation is sim'lar to that already described.

In the modification shown in Fig. 3, a

short projection 27 is provided on one sideof the plate 22 parallel with the shoulder 24. The slot 21 in plate 22 is made wider so that this projection may pass through it freely when the door is closed. With this construction, if the door is pried over, the projection 27 will catch on the plate 20 outside of the slot 21 and will act as a hook to hold the door closed, even if therspring latch is moved out of the part of plate 22 which forms its striking plate.

The parts shown in Fig. 5 are purpose,

for a similar but may be used, as might also the plates 20 and 22, without being associated plate outside of this slot if the door is forced with the door latch or lock. In this case the'plate 20 is made with an offset so that the part inwhich is the slot 21 is out of line withthe part which is to be secured to the door. The end of plate 22 is bent over as at 27 to form a short hook which may pass through the slot Ql freely, but will be brought'into engagement with the door back, to hold the door closed. v

I have illustrated several modifications of my invention to show that I do not limit myself to any specific form or construction.

What Iclaim is.- v A swinging door, a latch therefor having a sliding catch, a plate on the door under said catch projecting beyond the edge of the door, said plate being provided with a slot, a door casing, and a plate aflixed to said casing having a portion adapted to pass 20 door latch, and being provided with a slot I for the reception 'of the catch of the door 25 latch.

In testimony whereof I have signed my name to this application in the presence of two subscribing witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2898659 *Sep 9, 1955Aug 11, 1959Simplex Forms System IncConcrete form locking means
US3963269 *Jul 25, 1974Jun 15, 1976Rosenberg Sheldon RSecurity device
US4078836 *Apr 6, 1977Mar 14, 1978Wilson Delmar FSecurity device for a door
US4171836 *May 10, 1978Oct 23, 1979Lst CorporationSecurity strike plate assembly
US4854621 *Jan 19, 1988Aug 8, 1989Baldwin Robert LReinforced door security assembly
US5586796 *Feb 21, 1995Dec 24, 1996Fraser; Paul E.Reinforcing devices for doors and door frames
US6971322Mar 14, 2003Dec 6, 2005Delaware Capital Formation Inc.Protective enclosure
US7726751 *Nov 11, 2005Jun 1, 2010Rockwell Automation Technologies, Inc.Common structure and door for multiple door electrical enclosure latching systems
US7752982 *Jul 13, 2010Maxchief Investments, Ltd.Latching mechanism for foldable table
US20040177794 *Mar 14, 2003Sep 16, 2004Dubois Clay AllenProtective enclosure
US20070108877 *Nov 11, 2005May 17, 2007Herberto BergmannCommon structure and door for multiple door electrical enclosure latching systems
US20080072804 *Oct 17, 2007Mar 27, 2008Wen-Sheng LinLatching mechanism for foldable table
U.S. Classification292/302, 292/340, 49/394, 292/346
Cooperative ClassificationE05B65/087