CA1038118A - Electromagnetic door holder - Google Patents
Electromagnetic door holderInfo
- Publication number
- CA1038118A CA1038118A CA210,464A CA210464A CA1038118A CA 1038118 A CA1038118 A CA 1038118A CA 210464 A CA210464 A CA 210464A CA 1038118 A CA1038118 A CA 1038118A
- Authority
- CA
- Canada
- Prior art keywords
- flange
- bushings
- armature
- bolt
- leg portions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
- E05C17/56—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by magnetic or electromagnetic attraction or operated by electric or electromagnetic means
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T292/00—Closure fasteners
- Y10T292/11—Magnetic
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/32—Articulated members
- Y10T403/32606—Pivoted
- Y10T403/32631—Universal ball and socket
- Y10T403/32681—Composite ball
- Y10T403/32704—Stud extends into ball
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
ELECTROMAGNETIC DOOR HOLDER
Abstract An adjustable door mounted armature for cooperating with a wall-mounted electromagnet and which provides for move-ment of the armature in substantially any direction. The arm-ature element includes an apertured flange; and a door mounted support plate includes a bifurcated portion with apertures. A
pair of apertured bushings is employed, one on either side of the aperture in the flange, and each of the bushings has a gen-erally spherical outer configuration. The flange, and associ-ated bushings, are received between the bifurcated portions of the support plate with all apertures in alignment. A fastening bolt passes through the aligned apertures. By this means, the flange is supported between the bifurcated elements of the mount-ing plate to permit substantially unrestricted rotation of the flange in any direction relative to the support plate over at least a predetermined range of motion. The frictional resistance to movement of the armature element may be adjusted by the ten-sion in the fastening bolt which is tensioned so that the arma-ture will tend to retain the position to which it was last moved, thereby permitting adjustment of the armature element so that it will lie perfectly flush against the wall-mounted electromagnet.
Abstract An adjustable door mounted armature for cooperating with a wall-mounted electromagnet and which provides for move-ment of the armature in substantially any direction. The arm-ature element includes an apertured flange; and a door mounted support plate includes a bifurcated portion with apertures. A
pair of apertured bushings is employed, one on either side of the aperture in the flange, and each of the bushings has a gen-erally spherical outer configuration. The flange, and associ-ated bushings, are received between the bifurcated portions of the support plate with all apertures in alignment. A fastening bolt passes through the aligned apertures. By this means, the flange is supported between the bifurcated elements of the mount-ing plate to permit substantially unrestricted rotation of the flange in any direction relative to the support plate over at least a predetermined range of motion. The frictional resistance to movement of the armature element may be adjusted by the ten-sion in the fastening bolt which is tensioned so that the arma-ture will tend to retain the position to which it was last moved, thereby permitting adjustment of the armature element so that it will lie perfectly flush against the wall-mounted electromagnet.
Description
1~)3t31~3 Background of the Invention It is well-known in the art to provide automatic door closure systems for public buildings whereby fire doors inter-connecting various parts of a building are normally in the open position and retained in that position by means of an electro-magnetic device comprising a wall-mounted electromagnet and an armature means for the electromagnet which is mounted on the door. With the door in the open position, the armature element on the door is brought into juxtaposition with the electromagnet on the wall, and the door is held open as long as the electro-magnet remains energized. In the event of a fire, for example, the electromagnets for the various doors can be selectively or all de-energized, thereby permitting the corresponding doors to swing shut by means of associated door closure means.
It is necessary, of course, that the door, when held in the open position, provide for the armature element to be brought into a position where it is exactly flush with an element forming a part of the wall-mounted electromagnet. often this is accomplished by providing that the armature element itself be, in effect, loosely supported on a mounting bracket secured to the door. As a result, whenever the door is opened, the armature element is brought into physical contact with the electromagnet, and the loose fitting of the armature element upon its associated mounting bracket then permits it to assume a position where it is flush with the associated element on the wall. It has been found, however, that the manufacture of such devices entails a considerable amount of cost, resulting principally from the difficulty of properly assembling the various elements so as to -1- ~ ,~
1~3~
provide the desired degree of freedom of the armature element relative to its supporting bracket.
Summary of the Invention It is the object of the present invention to provide a door-mounted armature means for an electromagnetic door closure apparatus comprising a door-mounted bracket and with a pivotally mounted armature element secured thereto. The securing means for the armature element comprises a flange on the armature element defining therein an aperture and a bifurcated portion on the door-mounted bracket capable of receiving the flange between the opposing legs of the bifurcated portion. The distance between the opposing faces of the leg portions of the bifurcated portion is substantially greater than the thickness of the flange so that the leg portions do not restrict the freedom of movement of the armature element.
The fastening means for the armature element comprises a threaded bolt passing through aligned apertures in the opposing legs of the bifurcated portion and with such bolt passing through the aperture in the flange comprising a part of the magnet arma-ture. A pair of nylon bushing elements each having a generallyhemispherical outer surface is provided to permit a substantial degree of freedom of movement of the armature element while yet permitting adjustment of the frictional resistance so that the armature element will retain the position to which it is last operated and thereby maintain its flat outer surface perfectly flush against the wall-mounted electromagnet.
Brief Description of the Drawings In describing the invention, reference will be made to 1Q38~8 the accompanying drawing in which:
Figure 1 diagrammatically illustrates an electromagnetic door system employing the door-mounted armature means of the present invention;
Figure 2 illustrates in perspective form the door-mounted armature means of the present invention and also the wall-mounted electromagnet;
Figure 3 illustrates in perspective the several elements comprising the door-mounted armature means;
Figure 4 is a plan view of the armature means of this invention; and Figure S is a side view of the apparatus of Figure 4.
Detailed Description of the Preferred Embodiment Figure l comprises a diagrammatic illustration of an electromagnetic system for the control of various doors in a building. A plurality of doors 10 is shown, each provided with a closure means 12 normally acting to urge each door 10 to a closed position with respect to the door frame provided in wall 14. Mounted on each door 10 is a magnet armature means 16 which i8 in juxtaposition with an electromagnet means 18 securely mounted to wall 20. A power supply 22 provides energization over wires 24 for normally energizing each of the electromagnet means 18 to thereby retain each door 10 in the open position. However, in the event of the detection of, for example, a fire by the fire detection system 26, the power supply 22 de-energizes wires 24, thereby releasing electromagnet means 18 so that each door can then be swung to its closed position.
The wall-mounted electromagnet means of the invention is shown at 26 in Figure 2. This electromagnet means 26 is 1~38~8 provided with a flat circular outer surface forming opposed magnetic poles 28 and 29 of an electromagnetic clrcuit. The door-mounted armature means of the invention i~ also shown ln Figure 2 and comprises a mounting bracket 30 as well as an armature element 31.
Figure 3 illustrates in greater detail the door-mounted bracket 30 as comprising a bifurcated portion including two opposed leg portions 32 and 34. Both of the leg portions define axially aligned through bores 36 and 38 respectively, the upper bore 36 belng threaded so as to threadably engage with the threaded end of a bolt 40 which can be inserted into the aligned apertures by passing such bolt together with the cooperating unit 42 upwardly through the bottom of bore 38 and then screwing the bolt 40 into the threaded aperture 36. The nut 42 is provided with a central aperture therein which is sufficiently large so as to be slidable along the shaft of bolt 40. Thus, preferably the nut 42 does not have internal threads engaging with the threaded end Or bolt 40 but iB rather readily slidable along the bolt.
The armsture element 31 is provlded with a flange portion 44 having a cylindrical aperture 46 formed therein. The diameter Or this aperture 46 is slightly in excess of that of the cylindrical portion 48 Or each bushing 50. In addition to having the dylindrical portion 48, each bushing is provided with a generally hemispherical outer surface 52 and also deflnes a central bore 54 therethrough which is tapered as shown in the cross-sectional view of Figure 5, having a diameter at its cylindrical end which is only slightly larger than the diameter of bolt 40 but having a significantly larger dlameter at its other hemispherical end.
1~3~
The assembly of the variou~ parts of the armature means is shown in Figure~ 4 and 5. To assemble the mechanism, the two bushings 50 are inserted into opposlte sides of the aperture 46 in flange 44, and thls assembly 1~ then placed between the two opposed legs ~2 and 34~ Thereafter, the nut 42 ls placed upon bolt 40, and thls combination of elements is lnserted into the aperture 38 from below and with the threaded end of bolt 40 then screwed into the threads of aperture 36.
As the bolt is threaded further into the threaded aperture 36, greater pressure is exerted by the upper end of nut 42 against the lower one of the bushings 50 80 that both of these bushings are squeezed together and the frictlonal resistance to movement of flange 44 is thereby increased. The tapered diameter of the bushings 50 permits a substantial degree of movement of armature element 31 about an axis at right angles to bolt 40, and of course there is an even greater degree of freedom of movement of armature element 31 about the axls Or bolt 40 as is more clearly illustrated in Figure 4.
It will thus be apparent that the pre~ent inventlon provides a means whereby an armature element may be ad~usted to any deslred position and yet be frictionally restralned from moving rrom that posltlon once adJusted. Thls ad~ustablllty is provlded by a very simple arrangement of parts which facilitates thelr convenlent and qulck assembly.
~A ~5~
It is necessary, of course, that the door, when held in the open position, provide for the armature element to be brought into a position where it is exactly flush with an element forming a part of the wall-mounted electromagnet. often this is accomplished by providing that the armature element itself be, in effect, loosely supported on a mounting bracket secured to the door. As a result, whenever the door is opened, the armature element is brought into physical contact with the electromagnet, and the loose fitting of the armature element upon its associated mounting bracket then permits it to assume a position where it is flush with the associated element on the wall. It has been found, however, that the manufacture of such devices entails a considerable amount of cost, resulting principally from the difficulty of properly assembling the various elements so as to -1- ~ ,~
1~3~
provide the desired degree of freedom of the armature element relative to its supporting bracket.
Summary of the Invention It is the object of the present invention to provide a door-mounted armature means for an electromagnetic door closure apparatus comprising a door-mounted bracket and with a pivotally mounted armature element secured thereto. The securing means for the armature element comprises a flange on the armature element defining therein an aperture and a bifurcated portion on the door-mounted bracket capable of receiving the flange between the opposing legs of the bifurcated portion. The distance between the opposing faces of the leg portions of the bifurcated portion is substantially greater than the thickness of the flange so that the leg portions do not restrict the freedom of movement of the armature element.
The fastening means for the armature element comprises a threaded bolt passing through aligned apertures in the opposing legs of the bifurcated portion and with such bolt passing through the aperture in the flange comprising a part of the magnet arma-ture. A pair of nylon bushing elements each having a generallyhemispherical outer surface is provided to permit a substantial degree of freedom of movement of the armature element while yet permitting adjustment of the frictional resistance so that the armature element will retain the position to which it is last operated and thereby maintain its flat outer surface perfectly flush against the wall-mounted electromagnet.
Brief Description of the Drawings In describing the invention, reference will be made to 1Q38~8 the accompanying drawing in which:
Figure 1 diagrammatically illustrates an electromagnetic door system employing the door-mounted armature means of the present invention;
Figure 2 illustrates in perspective form the door-mounted armature means of the present invention and also the wall-mounted electromagnet;
Figure 3 illustrates in perspective the several elements comprising the door-mounted armature means;
Figure 4 is a plan view of the armature means of this invention; and Figure S is a side view of the apparatus of Figure 4.
Detailed Description of the Preferred Embodiment Figure l comprises a diagrammatic illustration of an electromagnetic system for the control of various doors in a building. A plurality of doors 10 is shown, each provided with a closure means 12 normally acting to urge each door 10 to a closed position with respect to the door frame provided in wall 14. Mounted on each door 10 is a magnet armature means 16 which i8 in juxtaposition with an electromagnet means 18 securely mounted to wall 20. A power supply 22 provides energization over wires 24 for normally energizing each of the electromagnet means 18 to thereby retain each door 10 in the open position. However, in the event of the detection of, for example, a fire by the fire detection system 26, the power supply 22 de-energizes wires 24, thereby releasing electromagnet means 18 so that each door can then be swung to its closed position.
The wall-mounted electromagnet means of the invention is shown at 26 in Figure 2. This electromagnet means 26 is 1~38~8 provided with a flat circular outer surface forming opposed magnetic poles 28 and 29 of an electromagnetic clrcuit. The door-mounted armature means of the invention i~ also shown ln Figure 2 and comprises a mounting bracket 30 as well as an armature element 31.
Figure 3 illustrates in greater detail the door-mounted bracket 30 as comprising a bifurcated portion including two opposed leg portions 32 and 34. Both of the leg portions define axially aligned through bores 36 and 38 respectively, the upper bore 36 belng threaded so as to threadably engage with the threaded end of a bolt 40 which can be inserted into the aligned apertures by passing such bolt together with the cooperating unit 42 upwardly through the bottom of bore 38 and then screwing the bolt 40 into the threaded aperture 36. The nut 42 is provided with a central aperture therein which is sufficiently large so as to be slidable along the shaft of bolt 40. Thus, preferably the nut 42 does not have internal threads engaging with the threaded end Or bolt 40 but iB rather readily slidable along the bolt.
The armsture element 31 is provlded with a flange portion 44 having a cylindrical aperture 46 formed therein. The diameter Or this aperture 46 is slightly in excess of that of the cylindrical portion 48 Or each bushing 50. In addition to having the dylindrical portion 48, each bushing is provided with a generally hemispherical outer surface 52 and also deflnes a central bore 54 therethrough which is tapered as shown in the cross-sectional view of Figure 5, having a diameter at its cylindrical end which is only slightly larger than the diameter of bolt 40 but having a significantly larger dlameter at its other hemispherical end.
1~3~
The assembly of the variou~ parts of the armature means is shown in Figure~ 4 and 5. To assemble the mechanism, the two bushings 50 are inserted into opposlte sides of the aperture 46 in flange 44, and thls assembly 1~ then placed between the two opposed legs ~2 and 34~ Thereafter, the nut 42 ls placed upon bolt 40, and thls combination of elements is lnserted into the aperture 38 from below and with the threaded end of bolt 40 then screwed into the threads of aperture 36.
As the bolt is threaded further into the threaded aperture 36, greater pressure is exerted by the upper end of nut 42 against the lower one of the bushings 50 80 that both of these bushings are squeezed together and the frictlonal resistance to movement of flange 44 is thereby increased. The tapered diameter of the bushings 50 permits a substantial degree of movement of armature element 31 about an axis at right angles to bolt 40, and of course there is an even greater degree of freedom of movement of armature element 31 about the axls Or bolt 40 as is more clearly illustrated in Figure 4.
It will thus be apparent that the pre~ent inventlon provides a means whereby an armature element may be ad~usted to any deslred position and yet be frictionally restralned from moving rrom that posltlon once adJusted. Thls ad~ustablllty is provlded by a very simple arrangement of parts which facilitates thelr convenlent and qulck assembly.
~A ~5~
Claims (4)
1. In an electromagnetic door holder for retaining a door in an open position and being of the type which comprises an electromagnetic flux generating means and an armature means one of which is secured to the door while the other is disposed at a selected position, the improvement comprising:
said armature means comprising a bracket member and an armature member supported on said bracket member by a pivot-al support means, said pivotal support means including a bifurcated portion having axially aligned apertures in its opposed leg portions and also including an apertured flange disposed be-tween said leg portions with the aperture of said flange aligned with the apertures of said opposed leg portions, a pair of apertured bushings each having at least in part a generally spherical portion and respectively dis-posed on opposite sides of said flange with the apertures of said bushings aligned with said aforementioned apertures, a bolt passing through said aligned apertures and means for adjusting the position of said bolt axially rela-tive to said opposed leg portions, each bushing being secured to one of said two mem-bers while its part spherical portion bears against and ro-tates relative to the other said member to permit thereby substantially unrestricted rotation of said flange in any direction relative to said bracket over at least a predetermined range of motion, said bolt adjusting means comprising a threaded end portion of said bolt which threadably engages with one of said opposed leg portions and further including means on said bolt which is forcibly urged against one of said bushings as said bolt is threaded into said one opposed leg portion, said bolt adjusting means controlling the frictional restraining force exerted between said flange and said opposed leg portions through said bushings.
said armature means comprising a bracket member and an armature member supported on said bracket member by a pivot-al support means, said pivotal support means including a bifurcated portion having axially aligned apertures in its opposed leg portions and also including an apertured flange disposed be-tween said leg portions with the aperture of said flange aligned with the apertures of said opposed leg portions, a pair of apertured bushings each having at least in part a generally spherical portion and respectively dis-posed on opposite sides of said flange with the apertures of said bushings aligned with said aforementioned apertures, a bolt passing through said aligned apertures and means for adjusting the position of said bolt axially rela-tive to said opposed leg portions, each bushing being secured to one of said two mem-bers while its part spherical portion bears against and ro-tates relative to the other said member to permit thereby substantially unrestricted rotation of said flange in any direction relative to said bracket over at least a predetermined range of motion, said bolt adjusting means comprising a threaded end portion of said bolt which threadably engages with one of said opposed leg portions and further including means on said bolt which is forcibly urged against one of said bushings as said bolt is threaded into said one opposed leg portion, said bolt adjusting means controlling the frictional restraining force exerted between said flange and said opposed leg portions through said bushings.
2. In an electromagnetic door holder for retaining a door in an open position and being of the type which comprises an electromagnetic flux generating means and an armature means one of which is secured to the door while the other is disposed at a selected position, the improvement comprising:
said armature means comprising a bracket member and an armature member supported on said bracket member by a pivot-al support means, said pivotal support means including a bifurcated portion having axially aligned apertures in its opposed leg portions and also including an apertured flange disposed be-tween said leg portions, a pair of apertured bushings each having at least in part a generally spherical portion, said bushings being secured to said flange one on each side thereof and with the apertures of said bushings aligned with the aperture of said flange and with one of said bushings being urged against a respective one of said opposed leg portions, bolt means passing through said aligned apertures and through the aperture in said bushings and concomitantly the aperture of said flange for adjustably compressing said bushings and said flange between at least one of said leg portions and a means responsive to axial adjustment of said bolt means for adjusting the frictional resistance to rotation of said flange relative to said bracket, said part spherical portions on said bushings permitting substantially unrestricted rotation of said flange in any direction relative to said bracket and to said bolt over at least a predetermined range of motion.
said armature means comprising a bracket member and an armature member supported on said bracket member by a pivot-al support means, said pivotal support means including a bifurcated portion having axially aligned apertures in its opposed leg portions and also including an apertured flange disposed be-tween said leg portions, a pair of apertured bushings each having at least in part a generally spherical portion, said bushings being secured to said flange one on each side thereof and with the apertures of said bushings aligned with the aperture of said flange and with one of said bushings being urged against a respective one of said opposed leg portions, bolt means passing through said aligned apertures and through the aperture in said bushings and concomitantly the aperture of said flange for adjustably compressing said bushings and said flange between at least one of said leg portions and a means responsive to axial adjustment of said bolt means for adjusting the frictional resistance to rotation of said flange relative to said bracket, said part spherical portions on said bushings permitting substantially unrestricted rotation of said flange in any direction relative to said bracket and to said bolt over at least a predetermined range of motion.
3. The improvement of claim 2 wherein said bifurcated portion is integral with said bracket member and said flange is integral with said armature member.
4. The improvement of claim 2 wherein each said bush-ing includes a cylindrical portion fitting within said aperture in said flange and said generally spherical portion extending outwardly on each side of said flange, at least one of said spherical portions bearing against a respective one of said opposed leg portions.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US436774A US3913958A (en) | 1974-01-25 | 1974-01-25 | Electromagnetic door holder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1038118A true CA1038118A (en) | 1978-09-12 |
Family
ID=23733783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA210,464A Expired CA1038118A (en) | 1974-01-25 | 1974-10-01 | Electromagnetic door holder |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3913958A (en) |
| CA (1) | CA1038118A (en) |
| GB (1) | GB1489472A (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4440428A (en) * | 1981-09-01 | 1984-04-03 | Jessup Frank L | Apparatus for delaying the closing of a door |
| US4957316A (en) * | 1989-04-19 | 1990-09-18 | Harrow Products, Inc. | Armature for electromagnetic lock |
| US5139293A (en) * | 1991-11-08 | 1992-08-18 | Von Duprin, Inc. | Armature assembly for electromagnetic door holder |
| DE4213298A1 (en) * | 1992-04-23 | 1993-10-28 | Scharwaechter Gmbh Co Kg | Handrail mounting for motor vehicle door locks |
| US5555484A (en) * | 1994-04-04 | 1996-09-10 | Von Duprin, Inc. | Electromagnetic door holder system |
| US5741034A (en) * | 1995-10-02 | 1998-04-21 | General Signal Corporation | Electromagnetic door holder apparatus |
| FR2760485B1 (en) * | 1997-03-07 | 1999-04-23 | Seva | ADJUSTABLE AND NEUTRALIZABLE LOCKING DEVICE OF AN OPEN DOOR AND DOOR COMPRISING SUCH A DEVICE |
| US20030205953A1 (en) * | 2002-05-01 | 2003-11-06 | Fox Robert N. | Electromagnetic locking system for cabinet doors and drawers |
| US20060279091A1 (en) * | 2005-06-06 | 2006-12-14 | Rhyneer George S | Shock-actuated lock |
| US20060238287A1 (en) * | 2004-12-11 | 2006-10-26 | Rsg/Aames Security, Inc. | Explosion proof door holder |
| US20060125247A1 (en) * | 2004-12-11 | 2006-06-15 | Andrea Furia | Moisture resistant wall mounted door holder |
| US7819441B1 (en) * | 2005-06-17 | 2010-10-26 | Ronald E Coman | Magnetic open door retainer for a motor vehicle conveyance component |
| US20140300118A1 (en) * | 2014-06-24 | 2014-10-09 | Caterpillar Inc. | Door system for machine |
| US9890572B2 (en) * | 2014-11-04 | 2018-02-13 | Haier Us Appliance Solutions, Inc. | Latch assembly |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2394276A (en) * | 1943-03-17 | 1946-02-05 | Thompson Prod Inc | Swivel joint |
| US3261631A (en) * | 1964-03-11 | 1966-07-19 | Frank G Alessi | Magnetic latching mechanism |
| US3287051A (en) * | 1964-08-10 | 1966-11-22 | Amerock Corp | Magnetic catch |
| DE1255518B (en) * | 1965-12-28 | 1967-11-30 | Rheinstahl Henschel Ag | Joint for steering or tie rods of vehicles with several rods |
| US3533652A (en) * | 1967-08-14 | 1970-10-13 | Rixson Inc | Apparatus for overcoming the residual magnetism in an electromagnetic door holder |
-
1974
- 1974-01-25 US US436774A patent/US3913958A/en not_active Expired - Lifetime
- 1974-10-01 CA CA210,464A patent/CA1038118A/en not_active Expired
-
1975
- 1975-01-03 GB GB310/75A patent/GB1489472A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1489472A (en) | 1977-10-19 |
| US3913958A (en) | 1975-10-21 |
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