US3313565A - Magnetic door catch - Google Patents

Magnetic door catch Download PDF

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Publication number
US3313565A
US3313565A US44414165A US3313565A US 3313565 A US3313565 A US 3313565A US 44414165 A US44414165 A US 44414165A US 3313565 A US3313565 A US 3313565A
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door
housing
pole pieces
magnet
head
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William J Brink
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William J Brink
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05CBOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16Devices holding the wing by magnetic or electromagnetic attraction
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/11Magnetic

Description

April 11, 1967 w. J. BRINK MAGNETIC noon CATCH Filed March 31, 1965 I NVEN TOR.

WILLIAM J. BRINK FIG ATTORNEYS United States Patent C) 3,313,565 MAGNETIC DOOR CATCH William J. Brink, Box 218, Bainbridge Island, Wash. 98110 Filed Mar. 31, 1965, Ser. No. 444,141 8 Claims. (Cl. 292-2515) This invention relates to a magnetic catch in which a permanent magnets magnetic attraction for an armature is relied upon to establish a latching hold. Magnetic catches find their greatest usefulness in securing swinging doors of cabinets and the like, with the pennanent magnet being carried by a housing which is usually attached to a stationary Wall of the cabinet and with the armature comprising a strike plate which is usually carried by the door.

If a magnetic catch is to perform its intended function to the best advantage it is necessary that the housing and the strike plate be so mounted upon the cabinet that the door is brought to bear against the edge of the outer wall of the cabinet precisely at the very moment that the strike plate contacts the permanent magnet. Should any gap remain between the strike plate and the magnet the effective magnetic attraction is perforce lessened and the magnet, which commonly is given a pivotal mounting within the housing, remains loose and can be subject to annoying vibration. When installing a magnetic catch it is usual to screw the housing piece to the underside of a shelf of the cabinet. Heretofore, the screws have 'been received through slots extending normal to the front edge of the shelf in order to permit fiore-and-aft adjustment of the housing and by means thereof positioning the magnet so that the same will protrude in the degree necessary to be engaged by the strike plate at precisely the right moment. A certain amount of trial and error is required, and it is perforce necessary to loosen the screws before and again tighten the screws after each adjustment. This conventional manner of mounting the housings is disadvantageous for several reasons. Repeated turning of a screw mutilates the holes in which the same are threaded. The grip becomes loose. The striker plate may then cause the housing to shift position and aggravate the looseness with each opening and closing of the door, pulling the magnet outwardly and pushing the same inwardly within the limits prescribed by the length of the slots.

The principal object of the present invention is to devise a magnetic catch in which the armature forming striker plate is formed as the flat head of a screw and produces the necessary adjustment by the degree to which it is threaded into the door of the cabinet. This advanced mode of adjustment permits the magnet housing to be secured by screws which pass through mating circular holes rather than the described slots. Impact between the striker plate and the magnet passes only an inconsequential shear force into the screws which firmly anchor the housing and a compressive force into the threaded stem of the striker plate.

It is a further object, and one which requires an elimination of the slots for its best realization, to provide a magnetic catch in which the magnet housing can be fixedly secured to the shelf of a cabinet in a single operation by pressure exerted from the jaws of clamping pliers.

As a yet additional and important object the invention aims to provide for the magnet a perfected housing which is of simple and inexpensive plastic composition, and one in which the magent can be assembled with greater ease and expedition than has been heretofore possible.

With the foregoing and other more particular objects and advantages in view the invention consists in the novel construction and in .the adaptation and combination of parts hereinafter described and claimed.

In the accompanying drawing:

FIGURE 1 is an exploded perspective view illustrating the several parts which comprise the magnetic catch of the present invention.

FIG. 2 is a fragmentary longitudinal vertical sectional view through the shelf and door of a cabinet and illustrating, in side elevation, the housed magnet and the striker plate of the present magnetic catch installed thereon.

FIGS. 3 and 4 are a fragmentary transverse vertical and a fragmentary longitudinal vertical sectional view showing the manner in which a special pair of clamping pliers are employed to install the housed magnet upon the underside of a cabinet shelf, the planes on which the sections are drawn being shown at 3-3 of FIG. 4 and 44 of FIG. 3, respectively; and

FIG. 5 is a perspective illustration of the striker plate viewed from a vantage point opposite that of FIG. 1.

The present invention follows the usual practice of employing a flat permanent magnet having parallel top and bottom faces and cut to a rectangular plan configmration, and sandwiched between upper and lower pole plates. The pole plates, which are identical, are similarly flat and of rectangular plan configuration but have a foreand-aft depth somewhat greater than the depth of the magnet. The numeral 1t) denotes the magnet, and 11 and 12 the pole plates. Each piece has corresponding registering circular holes, as 13, 14 and 15, cut in the substantial center thereof. Front and rear edges of the pole plates are ground fiat in a plane normal to the planes of the flat faces.

A housing which is molded from a suitable plastic material is formed to somewhat of a U-shape to provide a floor Wall 16 flanked by parallel side walls 17, producing for the sandwiched magnet a stall which is open at the top, the front, and the back. The fore-and-aft depth is less than that of the pole pieces. The width of the stall moderately exceeds the width of the sandwich. The sides of the stall rise to a height somewhat greater than the thickness of the sandwich. A hollow post 18 rises from the floor in a position centered both with respect to the width and the fore-and-aft depth of the stall. Other than for the post the floor of the stall is planar, and the parallel sides of the stall lie perpendicular to said planar face. The lower face of the door wall is or may be progressively thickened from both side edges toward a rib 21 located on the longitudinal median line of the housing.

Ears 20 project laterally from the outer face of each of the housings side walls. The ears are rearwardly olfset beyond the transverse median line of the housing land have their upper faces located flush with the upper edges of the side walls. Each ear is vertically pierced lay a circular hole 22. These holes are sized so as to provide a rather tight friction fit for wood mounting screws. The heads 23 of the screws are exposed below the ears. Threaded ends of shanks 24 protrude well above the ears.

The post 18 has a height greater than the thickness of the sandwich but less than the height of the side Walls 17. Its diameter, is less than the diameter of the center holes 13, 14 and 15 which are formed in the magnet 11 and said complementing pole pieces 11 and 12, thus to permit the components of the sandwich to float, so to speak, within the stall. The hollow center of the post, which is open at the top and closed at the bottom, receives the stem 25 of a fiat-headed rivet. The rivet is composed of a material not subject to magnetic attraction, brass by preference, and its stem has a friction fit in the post. The head of the rivet has the function of holding the sandwich against dislodgment from the stall, thus is larger in diameter than the holes 13-14-15, and has a length such that its flat head 26 lies flush with the upper edge of the side walls when the rivet occupies the position, bottomed within the post, in which it is shown in FIG. 4.

In assembling the parts the rivet can, but need not be, pressed fully home within the post. A special pliers, providing in one of its two jaws a slotted recess in which the housing seats, and having cupped openings at each side of the recess accommodating the exposed heads 23 of the mounting screws, permits the threaded shanks 24 of the screws to be driven into the wood shelf S of a cabinet While coincidently bottoming the rivet. Denoted by 27, said recessed jaw underlies the shelf while the other jaw 28 takes a bearing purchase upon the top face of the shelf. While not here illustrated, the pliers which I employ have a compound leverage which serves to maintain the floor of the recessed lower jaw parallel with the bearing face of the upper jaw throughout the opening and closing travel of the jaws.

The armature-forming striker plate 30 is formed as the head of a screw. The screw is made of magnetic material such as steel and its shank 31 is of the sheet-metal type, namely threaded throughout the length of a uniform diameter other than for a sharp point. A 12-thread shank of diameter, A" in length, is suitable. The head is circular with a large diameter, say A", is fiat on both faces, and in the outer face presents a socket 32 for the reception of a screw driver. The shank threads into the door D of the cabinet so that the head lies in paralleling spaced relation to the back face of the door in a position to engage the magnetic sandwich -1112 upon a closing of the door. Other than that the pole pieces of the sandwich should have a moderate exposure beyond the front edge of the shelf, the particular placement of the housing upon the shelf is unimportant in that the striker plate is enabled to be set at precisely adjusted positions by threading the same in or out. While not here illustrated it is thought to be self-evident that the striker plate, rather than being a single piece threading directly into the wood of the door, could be a Z-piece structure. The added piece would be immovably secured to the door and provide a socket into which the shank of the striker plate would thread. The shank would be a threaded bolt rather than a screw. An advantage in this Z-piece arrangement is that the threaded bolt, by the expedient of lining the socket in which it threads with a bolt-gripping sleeve of nylon, would be assured of holding a given setting over periods of long usage.

The invention and the manner of its use should be clearly understood from the foregoing detailed description of my now-preferred illustrated embodiment. Minor changes in the details of construction can be made without departing from the spirit of the invention and it is accordingly my intention that no limitations be implied and that the hereto annexed claims be given the broadest interpretation to which the employed language fairly admits.

What I claim is:

1. In a magnetic catch for holding the swinging door of a cabinet closed, a permanent magnet sandwiched between pole pieces and each formed from plate stock to a rectangular plan configuration, a housing of nonmagnetic material formed to provide an open-front stall in which said sandwich is received with portions of the pole pieces projecting through said front opening and having means for retaining the sandwich in loose relationship with the housing, means for non-adjustably mounting the housing with its retained sandwich upon a wall of the cabinet to have the front edges of said projecting portions of the pole pieces face outwardly proximal to and generally parallel with the inner surface of the closed door, and an armature plate for the magnet carried by the door in a position to strike said front edges of the pole pieces when the door is swung into said closed position, the armature plate being formed as the flat head of a screw having a comparatively long threaded shank of a uniform diameter throughout very nearly its entire length and; composed of a material attracted to the magnet and so threadably mounted upon said door that the act of turning the screw in one direction advances the head toward and in the other direction retracts the head from said inner surface of the door, thus to position the head in a selected position adjusted toward or from said inner surface.

2. A magnetic catch as claimed in claim 1 in which the means for retaining the sandwich comprises a post rigid with the housing and extending loosely through centrally placed holes formed in the two pole pieces and the magnet.

3. A magnetic catch as claimed in claim 1 in which the material composing the housing is plastic, the housing having a general U-shape producing a floor and side walls for the stall and leaving the top and the back as well as said front of the stall open, ears being provided extending laterally from said side walls each arranged to bear against said cabinet wall on which the housing is mounted and each pierced by a circular hole accommodating a respective mounting screw.

4. A magnetic catch as claimed in claim 3 in which the holes which pierce said ears are of a size to establish a' friction grip upon shanks of the related mounting screws.

5. A magnetic catch as claimed in claim 3 in which the two poles pieces and the magnet are formed with registering holes which fit loosely over a post which is made a rigid part of the housing and rises from the floor of the stall.

6. A magnetic catch as claimed in claim 3 in which the two pole pieces and the magnet are formed with registering holes which fit loosely over a post which is made a rigid part of the housing and rises from the floor of the stall, the post being hollow with an open top and having a headed pin of nonmagnetic material press-fitted in the hollow center, the head of the pin having a diameter larger than the diameter of said holes which are formed in the two pole pieces and the magnet.

7. In a magnetic catch, a permanent magnet sandwiched between pole pieces and each comprised of a flat plate of rectangular plan configuration with a hole in the center, a housing of nonmagnetic material formed to a general U-shape when viewed from the front to produce a stall in which the sandwich is received, the stall having a floor and side walls and being open at least at the front and the top, said housing having a rigid hollow post with an open top rising from the floor of the stall and fitting loosely through said center openings of the several components of the sandwich for holding the sandwich against dislodgment from the stall, and a headed pin of nonmagnetic material pressfitted in the hollow center of said post, the head of the pin having a diameter larger than the diameter of said holes which are formed in the two pole pieces and the magnet.

S. A magnetic catch as claimed in claim 7 in which the material of which said housing is composed is plastic, each of the side walls having an ear extending laterally therefrom and pierced with a circular hole, and screws for mounting the housing received through said holes in the ears and sized so that the shanks are frictionally gripped thereby.

References Cited by the Examiner UNITED STATES PATENTS 749,438 1/ 1904 Harrington 39 2,496,691 2/1950 Berry 292-2515 2,853,331 9/1958 Teetor 292-2515 3,003,802 10/1961 Wilson 292251.5 3,155,409 11/1964 Schlissel 292251.5 3,257,141 6/1966 Buus et a1 317-159 FOREIGN PATENTS 814,855 10/1951 Germany. 672,928 5/1952 Great Britain.

EDWARD C. ALLEN, Primary Examiner. RICHARD E. MOORE, Examiner.

Claims (1)

1. IN A MAGNETIC CATCH FOR HOLDING THE SWINGING DOOR OF A CABINET CLOSED, A PERMANENT MAGNET SANDWICHED BETWEEN POLE PIECES AND EACH FORMED FROM PLATE STOCK TO A RECTANGULAR PLAN CONFIGURATION, A HOUSING OF NONMAGNETIC MATERIAL FORMED TO PROVIDE AN OPEN-FRONT STALL IN WHICH SAID SANDWICH IS RECEIVED WITH PORTIONS OF THE POLE PIECES PROJECTING THROUGH SAID FRONT OPENING AND HAVING MEANS FOR RETAINING THE SANDWICH IN LOOSE RELATIONSHIP WITH THE HOUSING, MEANS FOR NON-ADJUSTABLY MOUNTING THE HOUSING WITH ITS RETAINED SANDWICH UPON A WALL OF THE CABINET TO HAVE THE FRONT EDGES OF SAID PROJECTING PORTIONS OF THE POLE PIECES FACE OUTWARDLY PROXIMAL TO AND GENERALLY PARALLEL WITH THE INNER SURFACE OF THE CLOSED DOOR, AND AN ARMATURE PLATE FOR THE MAGNET CARRIED BY THE DOOR IN A POSITION TO STRIKE SAID FRONT EDGES OF THE POLE PIECES WHEN THE DOOR IS SWUNG INTO SAID CLOSED POSITION, THE ARMATURE PLATE BEING FORMED AS THE FLAT HEAD OF A SCREW HAVING A COMPARATIVELY LONG THREADED SHANK OF A UNIFORM DIAMETER THROUGHOUT VERY NEARLY ITS ENTIRE LENGTH AND; COMPOSED OF A MATERIAL ATTRACTED TO THE MAGNET AND SO THREADABLY MOUNTED UPON SAID DOOR THAT THE ACT OF TURNING THE SCREW IN ONE DIRECTION ADVANCES THE HEAD TOWARD AND IN THE OTHER DIRECTION RETRACTS THE HEAD FROM SAID INNER SURFACE OF THE DOOR, THUS TO POSITION THE HEAD IN A SELECTED POSITION ADJUSTED TOWARD OR FROM SAID INNER SURFACE.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414309A (en) * 1966-06-30 1968-12-03 Nat Lock Co Magnetic catch assembly
US3425729A (en) * 1967-11-17 1969-02-04 Southco Magnetic latch fastener
US20100270817A1 (en) * 2009-04-28 2010-10-28 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Collapsible device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US749438A (en) * 1904-01-12 of southbridge
US2496691A (en) * 1948-06-19 1950-02-07 Harold H Pelzer Doorstop and holder
DE814855C (en) * 1950-02-05 1951-10-29 Max Baermann Device for retaining of lids, flaps, doors o. The like.
GB672928A (en) * 1949-06-07 1952-05-28 Jack Devereux Waters Improvements in stops for doors, gates and the like
US2853331A (en) * 1953-12-23 1958-09-23 Macy O Teetor Magnetic catch
US3003802A (en) * 1958-01-13 1961-10-10 Wilson Harry Carl Magnetic door latch
US3155409A (en) * 1960-09-23 1964-11-03 Penn Akron Corp Magnetic door catch
US3257141A (en) * 1963-06-17 1966-06-21 Indiana General Corp Magnetic transfer device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US749438A (en) * 1904-01-12 of southbridge
US2496691A (en) * 1948-06-19 1950-02-07 Harold H Pelzer Doorstop and holder
GB672928A (en) * 1949-06-07 1952-05-28 Jack Devereux Waters Improvements in stops for doors, gates and the like
DE814855C (en) * 1950-02-05 1951-10-29 Max Baermann Device for retaining of lids, flaps, doors o. The like.
US2853331A (en) * 1953-12-23 1958-09-23 Macy O Teetor Magnetic catch
US3003802A (en) * 1958-01-13 1961-10-10 Wilson Harry Carl Magnetic door latch
US3155409A (en) * 1960-09-23 1964-11-03 Penn Akron Corp Magnetic door catch
US3257141A (en) * 1963-06-17 1966-06-21 Indiana General Corp Magnetic transfer device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414309A (en) * 1966-06-30 1968-12-03 Nat Lock Co Magnetic catch assembly
US3425729A (en) * 1967-11-17 1969-02-04 Southco Magnetic latch fastener
US20100270817A1 (en) * 2009-04-28 2010-10-28 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Collapsible device

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