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Publication numberUS2255860 A
Publication typeGrant
Publication dateSep 16, 1941
Filing dateJun 28, 1940
Priority dateJun 28, 1940
Publication numberUS 2255860 A, US 2255860A, US-A-2255860, US2255860 A, US2255860A
InventorsRiedel Oscar E
Original AssigneeRiedel Oscar E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Door attachement
US 2255860 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

I Sept. 16, 1941. I o. E. RIEDEL DOOR ATTACHMENT Filed June 28, 1940 I v tilventor fliaai'llledql Patented Sept. 16, 1941 warren stares PATENT ore-ice.

1 Claim.

The present invention relates to improvements in attachments for doors and the like.

An object of the invention is the provision of a door attachment which is designed to prevent clandestine withdrawal of a door fastening bolt.

Another object of the invention is the provision of a guard-forming door attachment which can be quickly and easily fitted upon a door frame.

A further object of the invention is the provision of a guard-attachment for doors which can be readily fitted on doors of varying size.

Other objects and advantages of the invention will become apparent as the description progrosses.

In the accompanying drawing forming a part of this specification and in which like reference characters are employed to designate corresponding parts throughout the same:

Figure 1 is a perspective view of a preferred form of the attachment showing the sections in separated relation,

Figure 2 is a similar view showing the attachment sections operatively mounted on the frame of the door,

Figure 3 is an end view of the same showing a door latch associated therewith,

Figure 4 is an enlarged fragmentary section taken on the line 44 of Figure 3,

Figure 5 is a perspective View of a modified form of the attachment, and

Figure 6 is a transverse sectional view through the same attached to a door frame.

Referring to Figures 1 to 4 inclusive, wherein is illustrated a preferred embodiment of the invention, M generally designates the main section of the device, embodying a rigid plate formed of sheet metal or the like, shaped to provide a fastening plate In of elongated rectangular formation.

At one longitudinal edge of the plate I!) is formed an extension part, shaped to form a rectangular laterally protruding face portion I I having a rectangular central area struck and bent rearwardly to form a right angularly projecting medial flange I2. At the ends of the projecting portion II are provided approximately rectangular shaped end flanges I3 extending at right angles to the face portion II, as shown to advantage at Figure 1. At the outer longitudinal edge portion of the face part II is provided a right angularly extending side flange I 4 somewhat narrower than, and bent so that the ends are pressed against the outer edges of, the end flanges I3.

A section 0 complementary to the section M embodies a rigid strip of metal or the like bent longitudinally to form a relatively narrow flange I6 and a right angular generally wider flange II. This flange is cut to form therein a longitudinally elongated recess I8 in the outer portion, the length of which corresponds to the length of the plate I0 to slidably receive the latter therein. Intermediate the ends of the recess I8 the edge portion of the flange I1 is cut and bent in a direction opposed to the extension of the flange I6 to form a right angular narrow lip I9.

The device is fitted on the frame of the door by initially mounting the section 0 so that the flange I1 is arranged, in flush position, against the face of the door jamb, designated at J, while the right angular flange I6 is mounted in flush position against the side edge of a stop strip S, as shown at Figure 2. The section is firmly fastened in position by means of screws 2| extended through countersunk holes 22 while a groove is formed in the jamb to accommodate the inwardly projecting lip I9. The companion section M is disposed with the plate I0 fitted flush against the face of the jamb with the inner end portion in registration with the recess I8 in the section 0, screws 24 extending through holes 23 to fasten the plate in position. The laterally projecting portion of the plate I ll protrudes from the side edge of the frame jamb, forming a keeper frame having the face portion II co-planar with the plate l0 while the medial flange I2 fits against the side of the jamb and is secured thereto by a screw 25. The inner edges'of the end flanges I3 likewise fit against the side of the door frame so that these flanges, together with the outer flange I4, make a strong firmly mounmd keeper frame.

The modified form of the device, shown at Figures 5 and 6, provides a unitary structure formed of a metallic sheath shaped to provide an elongated body plate 26 having the inner longitudinal edge portion bent to form a right angular flange 2'! adapted to be fitted against the door frame stop. At the opposite outer edge of the plate 26, intermediate the ends, is formed a laterally projecting keeper frame F having the right angular flange structure corresponding to the frame shown and described in the preferred form of the attachment.

This construction presents an efficient guard plate which can be readily mounted on the frame jamb of the door to provide an effective guard which will prevent clandestine retraction of a locking bolt, as for instance the bolt B of the night-latch L, as by the insertion of an instrument for engaging and withdrawing the beveled head of the bolt. Furthermore, the attachment affords a very durable and efficient keeper frame. It will also be noted that the two-piece form of the device is conveniently adjustable in the as sembly of, the sections to fit door jambs of varying width, due to the engageable relation of the holder plate I 0 with the recess I 8 in the inner flange of the companion section 0.

It is to be understood that the forms of my invention herein shown and described are to be taken as preferred examples of the same, and that various changes as to the shape, size and arrangement of parts may be resorted 110 of the frame member to reinforce the said member.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2484024 *Jun 9, 1944Oct 11, 1949Garberding Waldo LLatch bolt guard
US2692158 *Jun 11, 1953Oct 19, 1954Tirschel Joseph CGuard for beveled locking bolts
US2964346 *Feb 26, 1958Dec 13, 1960Yale & Towne Mfg CoStrike
US3279840 *Sep 28, 1964Oct 18, 1966Anthony BaroneTamperproof and burglarproof shield for locks, latches and the like
US3392999 *Nov 17, 1966Jul 16, 1968Eugene L. ThompsonReversible lock guard for in-swinging doors
US3767245 *Mar 21, 1972Oct 23, 1973Keefe JJamb dead bolt plate
US4102546 *Sep 2, 1976Jul 25, 1978Michael CostelloBurglarproof guard for window lock
US4195870 *Aug 21, 1978Apr 1, 1980Jane PercocoSecurity striker plate
US4415191 *Jul 20, 1981Nov 15, 1983Thorp James BDoor locking mechanism
US4684160 *Aug 14, 1985Aug 4, 1987Nelson Gordon JDoor security device
US4770452 *Sep 19, 1986Sep 13, 1988Petree Jr Robert WConcealed door frame security device
US4861082 *May 4, 1988Aug 29, 1989Omni Systems, Inc.Door security system
US4865370 *May 23, 1988Sep 12, 1989John D. GassettKeeper for deadbolt locks
US5024475 *Jun 5, 1989Jun 18, 1991John D. GassettStrengthening door jamb
US5074606 *Oct 17, 1990Dec 24, 1991Priola James WDoor security system
US5127690 *Aug 9, 1991Jul 7, 1992Kenneth KimDoor safety striker plate assembly
US6082049 *Nov 14, 1997Jul 4, 2000Hudson; Justin RayMetal door frame reinforcements
US6318772 *Jul 17, 2000Nov 20, 2001Ferco International Ferrures Et Serrures De BatimentStriker and base and insert therefor
US6837527 *Sep 8, 2003Jan 4, 2005Michael T. LaurenzanaStrike plate assembly for a dead bolt
WO2011007192A1 *Sep 1, 2009Jan 20, 2011Canepa Llanos Victor RaulSingle-piece strike plate for externally mounted door locks
U.S. Classification292/340, 292/346
International ClassificationE05B17/20, E05B17/00
Cooperative ClassificationE05B17/2003
European ClassificationE05B17/20B