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Publication numberUS2497697 A
Publication typeGrant
Publication dateFeb 14, 1950
Filing dateSep 8, 1947
Priority dateSep 8, 1947
Publication numberUS 2497697 A, US 2497697A, US-A-2497697, US2497697 A, US2497697A
InventorsMerrill H Smith
Original AssigneeMerrill H Smith
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Doorstop
US 2497697 A
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Description  (OCR text may contain errors)

M. H. SMITH DOOR STOP Feb. 14, 1950 Filed Sept. 8, 1947 mum I N VEN TOR.

m Z m 4 ma lllllllll ATTEI RN EYS Patented Feb. 14, 1950 UNITED STATES PATENT OFFICE 2 Claims. 1

This invention relates to door stops.

It is an object of the present invention to provide a door stop which is retractible into the floor when the door is closed and which is automatically raised or lifted for engagement with the door as the door reaches the station where it is to be retained.

Other objects of the present invention are to provide a door stop unit which can be easily installed in the floor and upon the door which is of simple construction, durable, inexpensive to manufacture and efiicient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which Fig. l is a fragmentary and sectional View taken through the door stop with the armature raised for connection with the door to retain the door.

Fig. 2 is a fragmentary sectional view taken on line 2--2 of Fig. 1.

Fig. 3 is a fragmentary and bottom plan View of the door with the magnet mounted in it.

Fig. 4 is a fragmentary and top plan view of the floor and of the armature mounted in the same.

Fig. 5 is a fragmentary side elevational view of a modified form of armature which is provided with a raised center portion for added holding capacity.

Referring now to the figures of the drawing, Ill represents a floor about which there is swung a door II. In the floor I!) there is located an opening into which is extended a sleeve l3. This sleeve is flanged as shown at M to limit its downward movement through the floor. At the top of the floor there is a large diameter recess [5 adapted to receive the flange forming the top it of a plunger ll' slidable in the sleeve l3. The top IB and plunger I I is formed of magnetic material and serves as an armature to be lifted by a permanent magnet is fitted in the door H and retained therein by a long wood screw l9. The magnet may be of U-shape and is made sufiiciently strong so that it will automatically lift the top l 6 and the plunger I! whereby to provide a connection between the door and the floor to retain the door at the particular station to which it has been moved. The screw extends through a block 2| and through a hole 22 in the magnet [8. The block 2| may be made of brass or other non-magnetic material.

As shown in Fig. 2, the top l6 and the plunger are preferably of integral formation. The magnet is sufficiently strong to retain the door but can be separated from the armature by applying added pressure to the door. When the door moves away from the armature automatically the same will drop downwardly into the fioor and be concealed therein flush with the floor surface.

In Fig. 5 there is shown a modified form of armature and plunger wherein a cone formation 24 is provided in the center of the top plate so as to give added holding capacity. In this instance the head of the screw 19 is seated in a counterhored opening formed in piece 2| to receive the cone formation 24.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

I claim:

1. A door stop comprising a sleeve adapted to be fitted into a door, an armature vertically movable in the sleeve and adapted to lie flush with the floor surface when lowered, a magnet adapted to be fitted into a door at its bottom edge, said magnet having its end faces lying flush with the bottom of the door and adapted to elevate the armature from the floor when the door is extended thereover, said armature having a large diameter top portion adapted to fit a recess in the floor as the armature is lowered, said magnet being of U-shape and having a central opening adapted to receive a single Wood screw, a piece fitted between the ends of the magnet and having a hole aligned with the opening in the magnet, and a wood screw extending through the piece and the magnet and adapted to be extended into the door to retain the magnet therein.

2. A door stop comprising a sleeve adapted to be fitted into a fioor, an armature vertically movable in the sleeve and adapted to lie flush with the floor surface when lowered, a magnet adapted to be fitted into a door at its bottom edge, said magnet having its end faces lying flush with the bottom of the door and adapted to elevate the armature from the floor when the door is extended thereover, said armature having a large diameter top portion adapted to be lowered into a recess on the floor and a raised formation in the center of the top portion adapted to enter the magnet to provide added holding capacity between the door and the armature.

MERRILL H. SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Number Country Date 145,325 Germany Dec. 30, 1902 278,523 Great Britain Oct. 13, 1927

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
*DE145325C Title not available
GB278523A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2673755 *Apr 1, 1950Mar 30, 1954Asp Howard LMagnetic door catch
US2719050 *Aug 30, 1951Sep 27, 1955Teetor Macy OMagnetic catch
US2894778 *Oct 6, 1953Jul 14, 1959Lundholm Josef EMagnetic door latch
US3070289 *Dec 11, 1958Dec 25, 1962Coffee Charles WCoin depository for parking meter
US3131012 *Feb 7, 1961Apr 28, 1964Hubbell Inc HarveySafety locking electrical cable connector body and cap
US3258285 *Oct 1, 1964Jun 28, 1966Smith Roy KDoor stop and holder
US3791687 *Jun 19, 1972Feb 12, 1974H SchroederPop up magnetic door stop and holder
US4194771 *May 15, 1978Mar 25, 1980Biggs Ronald LMagnetic door stay retainer
US4293154 *Sep 28, 1979Oct 6, 1981Cassells Melvin KSafety lock for window sashes and the like
US4306744 *Dec 3, 1979Dec 22, 1981Krehbiel V DwightDoor retainer and alarm device
US4343500 *May 21, 1980Aug 10, 1982Thunderbolt CorporationFloor imbedded door bolt
US4487439 *Oct 27, 1981Dec 11, 1984Dynametric, Inc.Magnetic shear locking methods and apparatus
US4840411 *Feb 13, 1987Jun 20, 1989Harrow Products, Inc.Electromagnetic shear lock
US5944368 *Jun 12, 1997Aug 31, 1999Hastings; Mark S.Door knob holding device
US7367596 *Jan 6, 2006May 6, 2008Chi Pang LeungGround lock fitting
US7651140 *Nov 17, 2008Jan 26, 2010Richard LeggioDoor security device
US8403382 *Nov 12, 2008Mar 26, 2013Delta Tursysteme AgRetractable door stopper
US20110101711 *Nov 12, 2008May 5, 2011Givaudan SaRetractable door stopper
DE942494C *Jun 14, 1952May 3, 1956Harry SanderFeststeller fuer die Fluegel von Tueren
EP0903458A1 *Sep 8, 1998Mar 24, 1999Saint Genis, S.A.Retaining stop for doors and the like
Classifications
U.S. Classification292/74, 292/144, 16/82, 292/251.5, 292/DIG.150
International ClassificationE05C17/56
Cooperative ClassificationE05C17/56, Y10S292/15
European ClassificationE05C17/56