US2209809A - Magnetic holding means - Google Patents

Description

July 30, 1940.

W. E. BURTON MAGNETIC HOLDING MEANS Filed Jan. 16, 1937 ATTORNEY Patented July 30, 1940 UNITED STATES PATENT OFFICE 2,209,809 MAGNETIC HOLDING MEANS Walter E. Burton, Akron, Ohio I Application January 16, 1937, Serial No. 120,975 4 Claims. (Cl. 175 21) This invention relates to improvements in mag- Figure 7 is a sectional view showing a portion netic means for yieldably holding a closure memof a metallic structure and illustrating the manber in an operative position. While the invenner of securing my improved holding means tion is intended for use wherever it may be adthereto.

vantageously employed, to hold any type of clo- Figure 8 is a cross sectional view taken as indi- 5 Sure member in a, closed position, it is illustrated cated by the lines 8 8 of Figure 7,

in the drawing and hereinafter described as ap- Figure 9 is a central, vertical, sectional view plied to a door adapted to be used for bookcases. taken as indicated by the lines 9 9 of Figure cupboards, cabinets or similar structures. 10 and illustrating a modified form of magnet 10 Objects of the invention are to provide animwhich may be used in reducing the invention to 10 proved magnet of simple construction which may practice, be quickly and conveniently secured to a struc- Figure 10 is a front, elevational view of same. ture having a closure member and used in con- 'I'he invention will now be described with refernection with an armature whereby the member ence to the particular adaptation thereof illusl5 when closed will be maintained in that position trated. The numeral II denotes a permanently l5 under normal conditions and which can be easily magnetlzed horseshoe magnet which is of cylin` and conveniently opened when desired. drical form and which is provided with a dia- Further objects are to provide magnetic door metrically extending cut l2 which extends thereholding means which can be quickly and securely in from the executive face thereof and termi- K n mounted in an operative position on a structure nates adjacent the rear end thereof, thus proby positioning the same in a. bore formed in the viding a horeshoe magnet having two prongs I3 door or a portion of the structure adjacent thereand I4. The walls of the cut I2 diverge inwardly to to provide an exteriorly threaded cylindrical from the executive face of the magnet to a transmagnet having means for forming threads in verse plane adjacent the rear end thereof and g5 the wall of such bore whereby the same may be terminate in a rounded end wall.

threaded in a Wooden structure and adjustably The magnet II is provided with external screw retained therein and to provide additional means threads I5 which are preferably interrupted at for securing the magnet in an operative position. circumferentially spaced intervals with the lon- The above objects are accomplished and addigitudinal grooves I6. The grooves I6 are potional advantages are obtained by the novel consitioned therein to form sharp ends on the threads 30 struction hereinafter described with reference to I5 which facilitate the cutting of threads in the the accompanying drawing wherein there is wall of the bore formed in a wooden structure as shown an illustrative embodiment of the invenhereinafter described. The slot I2 forms a gap tion, it being understood that the invention may between the prongs of the magnet and serves as be adapted in various ways to various structures a kerf in which a screw driver blade may be in- 35 and that changes and modifications may be made serted to operatively position the magnet in a which come within the scope of the claims herebore. 'I'he rear end portion of the magnet II unto appended. is provided with an axial bore Il which extends Inthe drawing: therethrough from the cut I2 to the rear end Figure 1 is a side elevational view ,of a permathereof and which is designed to receive a screw nent magnet constructed in accordance with this I8 or other fastening means adapted to hold the invention, magnet in an operative position. At the forward Figure 2 is a plan view of same, face of the magnet the middle portion of the cut Figure 3 is a. central, vertical, sectional view I2 is enlarged to form an opening I'Ib which is 4. taken as indicated by the lines 3 3 of Figure 2, in coaxial alinement with the bore Il and is 45 Figure 4 is a cross sectional view of a door adapted to receive a screw driver blade which frame having a door operatively positioned theremay be used to operate the screw I8. in and showing one manner of 'operatively at- In Figure 4 there is shown the forward portion taching my improved holding means thereto, of a structure in which a door I9 is hingedly se- Figure 5 is'a sectional view showing a portion cured between the stiles 20 and 2l by means of 5 of a door and a portion of a stile with holding the hinges 22. In this particular structure the means constructed in accordance with this invenfree edge of the door I9 closes against a strip 23 tion operatively attached thereto, which overlaps the free edge of the door when Figure 6 is a similar view illustrating another the door is in a closed position. u manner of using my improved holding means, The overlapping portion of the strip 23 is provided-'with a here 24 which is formed therein from the forward side thereof. A magnet II is secured in the bore 24 with the executive face thereof ush with the forward face of the strip B 23. The armature 25 is secured to the inner face of the door I9 by means of the screws 26 or other suitable fastening means whereby the door when closed will position the armature 25 in operative relation to the poles of the magnet II.

It will be seen that the armature 25 will be attracted by the magnet Il and that the door will be yieldably held in a closed`A position with suilcient force to prevent its being unintentionally opened.

In Figure there is shownl a portion of a frame member 21 in which is mounted a door 28 which is shown in a closed position. Themember 21 is provided with a bore 29 in which there is mounted a magnet II which may be of the type'illustrated 90 in Figure 1 but which asshown is provided with a smooth exterior surface. In this'adaptation of the invention the magnet I I is secured in the bore 23 by means ofthe screw I8 with the executive face of the magnet flush with the face of the member 21.

'I'he door 28 is provided on the contacting edge thereof with an armature 38 which is formed of a plurality of layers of magnetically permeable material. vThe layers 30 are secured to the edge of the door 28 where the armature will be in an operative rposition to the magnet II when the door is closedby means of the screw 3l. The armature 30 is thus constructed of a plurality of layers so thatone vor more layers may be selectively employed to regulate the force with which the door is held in a closed position.

In Figure 6 there is shown a frame member 21 and a door 28 with one magnet I I positioned in the member 21 and the other magnet I I positioned in the door. The magnets II are thus arranged with each pole of each magnet presented to the opposite pole of the other magnet, thus providing a strong magnetic pull which will normally hold the door in 'a closed position.

In Figure 'I there is shown a portion of a metallic structure 32 having a metal door 33. A holding member 34 is secured to the structure 32 by means of the screws 35 or any suitable means. The holding member 34 is constructed of rubber, Bakelite, 50 brass or any suitable material.

The holder is provided with a suitable bore 36 in which is snugly received' a permanent magnet IIa. The holding member 34 thus presents the magnet to the edge ofthe door 33 which 55 forms an armature for the magnet and holds the ldoor in a closed position.

InvFigures 9 and 10 I have shown a bar magnet I Ia having a kerf I2a in the forward face thereof.

The magnet IIa is provided with an axial bore 80 I1a in which a'screW or othergfastening member may be inserted. The bar magnet Ila may be provided with screw threads I5 and a screw driver blade inserted in the kerf I2a to operatively position it in a bore:

In the particular adaptation of the invention shown, the bore I1a is enlarged at the forward end thereof to receive the head of a screw or other fastening means and the bore I1a is enlarged adjacent the rear end thereof to form a shoulder 31 which may be engaged by a tool to pull the magnet Ila from a bore in which it is mounted.

While I have illustrated and described an improved form of horseshoe magnet adapted to be threaded into a bore, it will be understood that the magnet I I may be made of any suitable, cross sectional shape adapted to be fitted in a seat formed in either the closure member or the frame member.

It will thus be seen that I have provided a door holding means which may be quickly and conveniently applied to a door, door frame or other part of a door structure which will not project in the door opening or present any protruding parts and which will be very eiilcient in yieldably` holding a door in a closed position.

Having thus illustrated my invention and de-A scribed the same in detail, what I claim as new and desire to secure by Letters Patent is:

1. In a permanent magnet, a cylindrical magnetized body, external screw threads on said body, said threads being interrupted at circumferentially spaced intervals to provide edges for cutting a thread in the wall of a bore.

2. In a permanent magnet, a cylindrical magnetized body, external screw .threads being interrupted at circumferentially spaced intervals to provide edges for cutting a thread in the wall of a bore, said body provided with a central bore for receiving a securing screw. A

3. In a permanent magnet, a cylindrical magnetized body, external screw threads being interrupted at circumferentially spaced intervals to provide edges for cutting a thread in the wall of a bore, said body provided with a central bore for receiving a securing screw; the central bore being enlarged at both ends to provide shoulders i whereby the securing screw may be wholly recessed into the magnet'and whereby hook means may be engaged with' the inner shoulder to facilitate removal of the magnet from a recess. 4. In a permanent magnet, a cylindrical, magnetized body, external screw threads on said body, said body provided with a central bore for receiving a securing screw, the central bore being enlarged'at both ends to provide shoulders where- 4 by the securing screw may be wholly recessed in said body and whereby hook means may be engaged with the inner shoulder to facilitate removal of the magnet from a recess. f

WALTER E. BURTON.

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