CA1188465A - Locking hinge - Google Patents
Locking hingeInfo
- Publication number
- CA1188465A CA1188465A CA000430857A CA430857A CA1188465A CA 1188465 A CA1188465 A CA 1188465A CA 000430857 A CA000430857 A CA 000430857A CA 430857 A CA430857 A CA 430857A CA 1188465 A CA1188465 A CA 1188465A
- Authority
- CA
- Canada
- Prior art keywords
- pin member
- sleeve
- pin
- hinge
- sleeve member
- 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
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- Hinges (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
Self closing lockable hinge system comprising: a pin member and a sleeve member adapted for rotation about the pin member. The pin member and the sleeve member have associated therewith complementary ramped surfaces such that upon rotation of one of the members relative to the other, at least limited axial separation between them is caused by engagement of the respective ramped surfaces; and a first lock to selectively prevent relative rotation between the pin member and the sleeve member.
Self closing lockable hinge system comprising: a pin member and a sleeve member adapted for rotation about the pin member. The pin member and the sleeve member have associated therewith complementary ramped surfaces such that upon rotation of one of the members relative to the other, at least limited axial separation between them is caused by engagement of the respective ramped surfaces; and a first lock to selectively prevent relative rotation between the pin member and the sleeve member.
Description
6~
The present inventlon is concerned wi-th a hinge inCorporating a locking mechanism and a self-closing mechanism for a door, gate or the like.
Of recent years, there has been a ~rowing concern over the increasing incidence of child drowningsl particularly in backyard swimming pools. As a consequence, many State Government and Local Government Authorities now require domestic swimming pools to be fenced and provided with an adequate locking means for access gates.
The present invention aims to provide a simple, inexpensive self-closing lockable hinge system for a gate, door or the like which obviates the need for a separate latch.
According to the inven-tion there is provided a lockable hinge system including:
a pin member and a sleeve member rotatable about said pin member, said pin member and said sleeve member having associated therewith cooperating cam surfaces such that upon rotation of one of said members relative -to the other, at least limited axial separation between said pin member and said sleeve member is caused by movement of the respective cam surfaces over each other; and locking means to selectively prevent axial separation between said pin member and said sleeve member whereby in a locked position relative rotation between said pin member and said sleeve member is prevented by engagement between said cam surfaces.
Preferably said means to selectively prevent axial separation between said pin member and said sleeve member comprises register means movable between a first aligned positionwhereby axial separation between said members is permitted and a second misaligned position whereby axial separation between said members is prevented.
.,~
Preferably said register means comprises a slotted sleeve adapted for rotation about said pin member, said slotted sleeve being adapted in a first position to slidably engage with an abutmen-t on said pin member to permit relative axial movement between said sleeve member and said pin member and in a second position to prevent relative axial movement between said pin member and said sleeve member.
Preferably, said locking means comprises complementary engageable surfaces formed respectively on the co-operating cam surfaces of said pin member and said sleeve member, said engageable surfaces being movable between an engaged state whereby relative rotation of said pin member and said sleeve member is prevented and a disengaged s-tate ~hereby relative rotation between said pin member and said sleeve member is permitted.
The hinge system preferably includes attach-ment means for attachment to a first and second body to permit hingeable connection therebetween.
Preferably again, said lockable hinge system comprises two hinge elements, wherein one of said hinge elements includes said locking means and -the other of said hinge elements includes said co-operating cam surfaces.
Various preferred embodiments of the invention will now be described with reference to the accompanying drawings in which:
Fig. l illustrates an exploded view of a top hinge _ _ ._~
member adapted for a safety sate.
FIG. 2 illustrates an exploded view oE a bottom hinge member for the gate, the top and bottom hinges together operatively comprising the hinge system according to the invention.
FIG. 3 illustrates an exploded view of a most preferred embodiment of the invention.
FIG~ 4 illustrates a cross-sectional view of the assembled embodiment shown in FIG. 3.
FIG. 5 illustrates one embodiment of a universal mounting arrangement for the invention.
In FIG. 1, -the top hinge member comprises a hinge pin 1 adapted to be fitted to a gate post by threaded projection 2. A sleeve member 3 is adap~ed for rotational mounting on pin 1 and is provided with a strap or like member 4 for attachment to gate member 5 by any suitable means such as by welding, bolting, screwing etc.
A slotted sleeve 6 comprising a substantially cylindrical member with a slotted aperture 7 is adapted to rotate about hinge pin 1 between sleeve member 3 and a dowel pin 8 extending radially from hinye pin 1 adjacent the upper end thereof. With the aperture 7 in alignment with dowel pin 8, limited axial movemen-t of sleeves 3 and 6 relative to hinge pin 1 is possible and the extent of movement is limited by the depth of the slotted aper-ture 7. When aperture 7 and dowel pin 8 are misaligned, substantially no axial separating movement between the pin and sleeve members is possible. A cover cap 9 is provided to fit neatly over sleeve 6 and is secured thereto by a grub screw lOo In FIG. 2, the lower hinge comprises a hinge pin 11 with a threaded projection 12 for attachment to a gate post.
Formed about the lower end of hinge pin 11 is a ramped surface 13 and projections 14 and 15 extending axially from surface 13 on opposed sides of the pin at the lowest and highest positions respectively of the ramped surface 13.
About pin 11 is fitted a substantially cylindrical sleeve 16 with a strap or like member 17 for attachment to gate member 18. The lower part of sleeve mem~er 16 is shaped with a ramped surface 19 to complement ramped surface 13 on hinge pin 11, Apertures 20 (not shown) and 21 are formed in the ramped surface 19 to correspond with projections 14 and 15 respectively. A cap 22 is formed on the top of sleeve member 16.
The operation of the hinge system of FIGS. 1 and 2 will now be described, As will be readily evident, the ramped surfaces 13 and 19 are aligned such that under the ac~ion of gravity, a gate, door or like member will swing to a normally closed position whereupon projections 14 and 15 will engage with corresponding apertures 20 and 21 respectively. In this position, openiny of the gate by pushing or pulling will be prevented. In order to open the gate, the gate must first be lifted to disengage projec-tions 14 and 15 from corresponding apertures 20 and 21 whereupon the gate may be swung in either direction with the ramped surfaces 13 and 19 engaging to further lift the gate as it is swung to a fully open position. On releasing the yate, it will swing under the action of gravity back to a central position locked by the engagement of projections 14 and 15 in apertures 20 and 21 respectively. Further locking for the gate is effected by rotating cap 9 on the top hinge to misalign slotted aperture ~ and dowel pin 8. With the second locking means thus engaged, it is not possible to lift the gate to disengage projections 14 and 15 from their respective corresponding apertures on the lower hinge and accordingly swinging of the gate in either direction is prevented.
FIG. 3 illustrates a most preferred emhodiment of the invention in which the ramped surfaces and the slotted sleeve locking means are combined in a single hinge element.
Hinge pin 23 is formed with a ramped surface 24 6~
adjacent its lower end. A threaded projection 25 is provided for attachment to a gate post or the like. Adjacent the upper end of pin 23 is a hollow dowel pin 26 or the like. Pin 26 is preferably a friction fit in hinge pin 23 but it could other-wise be fixed by screw threaded engagement or the like~
A substantially cylindrical sleeve member 26,with a ramp surface 28 complementary ramped surface 24, is adapted for rotation about hinge pin 23. Ramped surface 28 may be formed integrally with outer sleeve 29 or as a sleeve insert 27 as shown. Outer sleeve 29 is attached to a mounting bracket 30 shown attached to portion of a tubular gate member 31.
A slotted sleeve 32, also adapted for rotation on hinge pin 23, is provided with a slot 33 which in use is adapted to engage dowel pin 26. A cap 34 is adapted to engage over sleeve 32 and may be firmly affixed thereto by a grub screw 35 or the like. An aperture 36 is provided in the wall of cap 34 for reasons explained below and also to provide access for lubrication purposes.
FIG. 4 illustrates the various components shown in FIG. 3 in an assembled state. Further illustrated is a grub screw or the like 37 communicating at one end with the hollow aperture in dowel pin 26. As shown in phantom outline, grub screw 37 is advancable into the cavity between the inner wall of cap 34 and the outer surface of hinge pin 23. The end of the grub screw thus extends over the upper edge of slotted sleeve 32. This grub screw provides additlonal locking means for the hinge assembly in that even when aper-ture 33 is aligned wi-th pin 26 it is not possible to axially move or separate the componen-ts due to the engagement of one end of grub screw 37 with the top edge of slotted sleeve 32~
The operation of the hinge assem~ly is o-therwise as described above except that an initial upward lift of the gate is not essential due to the absence of engaging projections and apertures on the ramped surfaces.
The single hinge element shown in FIGSo 3 and 4 adequately fulfils the objects of the invention but in hinging of a gate,door or the like~ it is common practice to employ an upper and lower hinge element to distribute load more evenly. In such an arrangement it would be preferable to employ an upper hinge comprising the assembly shown in FIGS. 3 and 4 and a lower hinge comprising a simple pin and sleeve or operatively equivalent hinge.
FIG. 5 illustrates a modification suitabl~ for use as a lower hinge. A pin 38 and a sleeve 39 are formed with complementary engagable surfaces 40 and 41 on complementary shoulder portions. Thus a hinge assembly comprising an upper hinge element as shown in FIGS. 3 and 4 and a lower hinge element as shown in FIG. 5 provides an even load distribution on the gate, door or the like and on the post or surface to which it is hinged. In operation, the gate must first be lifted to disengage surfaces 40 and 41 in a manner similar to the embodiment shown in FIGS. 1 and 2. Use of an additional locking means on the lower hinge element not only adds the security and strength of a locked gate, door or the like but prevents damage to the upper hinge system if forced entry is attempted. Without the additional locking at the lower hinge, great compressive force may be applied between the upper edge of the slotted sleeve and the dowel pin which could cause burring.
Yet a further feature of the invention is illustrated in FIG. 5. The lower end of pin 38 is formed as a box-like base 42. In this manner, a variety of a-ttachment means may be employed. For example, the base 42 may be drilled and/or tapped to receive a pin, bolt or the like or a mounting strap may be attached by welding. The base readily lends itself to universal-type mounting arrangements such as that shown in phantom. The bracket 43 includes a shaped portion 44 for attachment to say a circular cross-section gate member or gate post~ Substantially parallel arms 45 are adapted to selectively locate and engage the base 40 under the compressive forces of bolts located in apertures 46.
It will be readily apparent that the hinge sys-tem of the present invention provides a very eEfective child-proof lock as not one, ~ut two locking devices must be deactivated before the gate or door can be swung.
The present invention contemplates a hinge system wherein one or more locking devices are comprised in a single hinge. For example, the hinge as illustrated in FIG~ 2 could ~e formed with a longer hinge pin 11 to which a dowel pin 8 could be fitted adjacent the top to locate sleeve 6 and cap 9. Cap 22 on sleeve 16 would of course be omi~ted in this embodiment.
In any embodiment of the invention, it is preferred that the second locking means comprising cap 9, sleeve 6 and dowel pin 8, be fitted to the top hinge of the gate out of reach of small children. Suitable markings could be made on the upper surface of cap 9 to indicate an unlocked position. In a further alternative embodimen-t, a key operated cylinder lock could be fitted to cap 9 or cap 34 to selectively permit rotation thereof.
Although the invention has been described with reference to safety gates, it is equally applicable to other items such as safety screen doors, medicine cupboard doors, house gates etr.
The hinge system according to the invention would be most beneficial in a rural environment for use on stock gates and the like where self-closing and self-locking (by the first lock means at least) features would prevent stock from straying.
It will be readily apparent that many modifications may be made to the hinge system without departing from -the spirit and scope of the invention.
The present inventlon is concerned wi-th a hinge inCorporating a locking mechanism and a self-closing mechanism for a door, gate or the like.
Of recent years, there has been a ~rowing concern over the increasing incidence of child drowningsl particularly in backyard swimming pools. As a consequence, many State Government and Local Government Authorities now require domestic swimming pools to be fenced and provided with an adequate locking means for access gates.
The present invention aims to provide a simple, inexpensive self-closing lockable hinge system for a gate, door or the like which obviates the need for a separate latch.
According to the inven-tion there is provided a lockable hinge system including:
a pin member and a sleeve member rotatable about said pin member, said pin member and said sleeve member having associated therewith cooperating cam surfaces such that upon rotation of one of said members relative -to the other, at least limited axial separation between said pin member and said sleeve member is caused by movement of the respective cam surfaces over each other; and locking means to selectively prevent axial separation between said pin member and said sleeve member whereby in a locked position relative rotation between said pin member and said sleeve member is prevented by engagement between said cam surfaces.
Preferably said means to selectively prevent axial separation between said pin member and said sleeve member comprises register means movable between a first aligned positionwhereby axial separation between said members is permitted and a second misaligned position whereby axial separation between said members is prevented.
.,~
Preferably said register means comprises a slotted sleeve adapted for rotation about said pin member, said slotted sleeve being adapted in a first position to slidably engage with an abutmen-t on said pin member to permit relative axial movement between said sleeve member and said pin member and in a second position to prevent relative axial movement between said pin member and said sleeve member.
Preferably, said locking means comprises complementary engageable surfaces formed respectively on the co-operating cam surfaces of said pin member and said sleeve member, said engageable surfaces being movable between an engaged state whereby relative rotation of said pin member and said sleeve member is prevented and a disengaged s-tate ~hereby relative rotation between said pin member and said sleeve member is permitted.
The hinge system preferably includes attach-ment means for attachment to a first and second body to permit hingeable connection therebetween.
Preferably again, said lockable hinge system comprises two hinge elements, wherein one of said hinge elements includes said locking means and -the other of said hinge elements includes said co-operating cam surfaces.
Various preferred embodiments of the invention will now be described with reference to the accompanying drawings in which:
Fig. l illustrates an exploded view of a top hinge _ _ ._~
member adapted for a safety sate.
FIG. 2 illustrates an exploded view oE a bottom hinge member for the gate, the top and bottom hinges together operatively comprising the hinge system according to the invention.
FIG. 3 illustrates an exploded view of a most preferred embodiment of the invention.
FIG~ 4 illustrates a cross-sectional view of the assembled embodiment shown in FIG. 3.
FIG. 5 illustrates one embodiment of a universal mounting arrangement for the invention.
In FIG. 1, -the top hinge member comprises a hinge pin 1 adapted to be fitted to a gate post by threaded projection 2. A sleeve member 3 is adap~ed for rotational mounting on pin 1 and is provided with a strap or like member 4 for attachment to gate member 5 by any suitable means such as by welding, bolting, screwing etc.
A slotted sleeve 6 comprising a substantially cylindrical member with a slotted aperture 7 is adapted to rotate about hinge pin 1 between sleeve member 3 and a dowel pin 8 extending radially from hinye pin 1 adjacent the upper end thereof. With the aperture 7 in alignment with dowel pin 8, limited axial movemen-t of sleeves 3 and 6 relative to hinge pin 1 is possible and the extent of movement is limited by the depth of the slotted aper-ture 7. When aperture 7 and dowel pin 8 are misaligned, substantially no axial separating movement between the pin and sleeve members is possible. A cover cap 9 is provided to fit neatly over sleeve 6 and is secured thereto by a grub screw lOo In FIG. 2, the lower hinge comprises a hinge pin 11 with a threaded projection 12 for attachment to a gate post.
Formed about the lower end of hinge pin 11 is a ramped surface 13 and projections 14 and 15 extending axially from surface 13 on opposed sides of the pin at the lowest and highest positions respectively of the ramped surface 13.
About pin 11 is fitted a substantially cylindrical sleeve 16 with a strap or like member 17 for attachment to gate member 18. The lower part of sleeve mem~er 16 is shaped with a ramped surface 19 to complement ramped surface 13 on hinge pin 11, Apertures 20 (not shown) and 21 are formed in the ramped surface 19 to correspond with projections 14 and 15 respectively. A cap 22 is formed on the top of sleeve member 16.
The operation of the hinge system of FIGS. 1 and 2 will now be described, As will be readily evident, the ramped surfaces 13 and 19 are aligned such that under the ac~ion of gravity, a gate, door or like member will swing to a normally closed position whereupon projections 14 and 15 will engage with corresponding apertures 20 and 21 respectively. In this position, openiny of the gate by pushing or pulling will be prevented. In order to open the gate, the gate must first be lifted to disengage projec-tions 14 and 15 from corresponding apertures 20 and 21 whereupon the gate may be swung in either direction with the ramped surfaces 13 and 19 engaging to further lift the gate as it is swung to a fully open position. On releasing the yate, it will swing under the action of gravity back to a central position locked by the engagement of projections 14 and 15 in apertures 20 and 21 respectively. Further locking for the gate is effected by rotating cap 9 on the top hinge to misalign slotted aperture ~ and dowel pin 8. With the second locking means thus engaged, it is not possible to lift the gate to disengage projections 14 and 15 from their respective corresponding apertures on the lower hinge and accordingly swinging of the gate in either direction is prevented.
FIG. 3 illustrates a most preferred emhodiment of the invention in which the ramped surfaces and the slotted sleeve locking means are combined in a single hinge element.
Hinge pin 23 is formed with a ramped surface 24 6~
adjacent its lower end. A threaded projection 25 is provided for attachment to a gate post or the like. Adjacent the upper end of pin 23 is a hollow dowel pin 26 or the like. Pin 26 is preferably a friction fit in hinge pin 23 but it could other-wise be fixed by screw threaded engagement or the like~
A substantially cylindrical sleeve member 26,with a ramp surface 28 complementary ramped surface 24, is adapted for rotation about hinge pin 23. Ramped surface 28 may be formed integrally with outer sleeve 29 or as a sleeve insert 27 as shown. Outer sleeve 29 is attached to a mounting bracket 30 shown attached to portion of a tubular gate member 31.
A slotted sleeve 32, also adapted for rotation on hinge pin 23, is provided with a slot 33 which in use is adapted to engage dowel pin 26. A cap 34 is adapted to engage over sleeve 32 and may be firmly affixed thereto by a grub screw 35 or the like. An aperture 36 is provided in the wall of cap 34 for reasons explained below and also to provide access for lubrication purposes.
FIG. 4 illustrates the various components shown in FIG. 3 in an assembled state. Further illustrated is a grub screw or the like 37 communicating at one end with the hollow aperture in dowel pin 26. As shown in phantom outline, grub screw 37 is advancable into the cavity between the inner wall of cap 34 and the outer surface of hinge pin 23. The end of the grub screw thus extends over the upper edge of slotted sleeve 32. This grub screw provides additlonal locking means for the hinge assembly in that even when aper-ture 33 is aligned wi-th pin 26 it is not possible to axially move or separate the componen-ts due to the engagement of one end of grub screw 37 with the top edge of slotted sleeve 32~
The operation of the hinge assem~ly is o-therwise as described above except that an initial upward lift of the gate is not essential due to the absence of engaging projections and apertures on the ramped surfaces.
The single hinge element shown in FIGSo 3 and 4 adequately fulfils the objects of the invention but in hinging of a gate,door or the like~ it is common practice to employ an upper and lower hinge element to distribute load more evenly. In such an arrangement it would be preferable to employ an upper hinge comprising the assembly shown in FIGS. 3 and 4 and a lower hinge comprising a simple pin and sleeve or operatively equivalent hinge.
FIG. 5 illustrates a modification suitabl~ for use as a lower hinge. A pin 38 and a sleeve 39 are formed with complementary engagable surfaces 40 and 41 on complementary shoulder portions. Thus a hinge assembly comprising an upper hinge element as shown in FIGS. 3 and 4 and a lower hinge element as shown in FIG. 5 provides an even load distribution on the gate, door or the like and on the post or surface to which it is hinged. In operation, the gate must first be lifted to disengage surfaces 40 and 41 in a manner similar to the embodiment shown in FIGS. 1 and 2. Use of an additional locking means on the lower hinge element not only adds the security and strength of a locked gate, door or the like but prevents damage to the upper hinge system if forced entry is attempted. Without the additional locking at the lower hinge, great compressive force may be applied between the upper edge of the slotted sleeve and the dowel pin which could cause burring.
Yet a further feature of the invention is illustrated in FIG. 5. The lower end of pin 38 is formed as a box-like base 42. In this manner, a variety of a-ttachment means may be employed. For example, the base 42 may be drilled and/or tapped to receive a pin, bolt or the like or a mounting strap may be attached by welding. The base readily lends itself to universal-type mounting arrangements such as that shown in phantom. The bracket 43 includes a shaped portion 44 for attachment to say a circular cross-section gate member or gate post~ Substantially parallel arms 45 are adapted to selectively locate and engage the base 40 under the compressive forces of bolts located in apertures 46.
It will be readily apparent that the hinge sys-tem of the present invention provides a very eEfective child-proof lock as not one, ~ut two locking devices must be deactivated before the gate or door can be swung.
The present invention contemplates a hinge system wherein one or more locking devices are comprised in a single hinge. For example, the hinge as illustrated in FIG~ 2 could ~e formed with a longer hinge pin 11 to which a dowel pin 8 could be fitted adjacent the top to locate sleeve 6 and cap 9. Cap 22 on sleeve 16 would of course be omi~ted in this embodiment.
In any embodiment of the invention, it is preferred that the second locking means comprising cap 9, sleeve 6 and dowel pin 8, be fitted to the top hinge of the gate out of reach of small children. Suitable markings could be made on the upper surface of cap 9 to indicate an unlocked position. In a further alternative embodimen-t, a key operated cylinder lock could be fitted to cap 9 or cap 34 to selectively permit rotation thereof.
Although the invention has been described with reference to safety gates, it is equally applicable to other items such as safety screen doors, medicine cupboard doors, house gates etr.
The hinge system according to the invention would be most beneficial in a rural environment for use on stock gates and the like where self-closing and self-locking (by the first lock means at least) features would prevent stock from straying.
It will be readily apparent that many modifications may be made to the hinge system without departing from -the spirit and scope of the invention.
Claims (6)
1. A self closing lockable hinge system including:-a pin member and a sleeve member rotatable about said pin member, said pin member and said sleeve member having associated therewith cooperating cam surfaces such that upon rotation of one of said members relative to the other, at least limited axial separation between said pin member and said sleeve member is caused by movement of the respective cam surfaces over each other; and locking means to selectively prevent axial separation between said pin member and said sleeve member whereby in a locked position relative rotation between said pin member and said sleeve member is prevented by engagement between said cam surfaces.
2. A hinge system as claimed in claim 1 wherein said means to selectively prevent axial separation between said pin member and said sleeve member comprises register means movable between a first aligned position whereby axial separation between said members is permitted and a second misaligned position whereby axial separation between said members is prevented.
3. A hinge system as claimed in claim 2 wherein said register means comprises a slotted sleeve adapted for rotation about said pin member, said slotted sleeve being adapted in a first position to slidably engage with an abutment on said pin member to permit relative axial movement between said pin member and said sleeve member.
4. A hinge system as claimed in claim 1 wherein said logging means comprises complementary engagable surfaces formed respectively on the co-operating cam surfaces of said pin member and said sleeve member, said engagable surfaces being movable between an engaged state whereby relative rotation of said pin member and said sleeve member is prevented and a disengaged state whereby relative rotation between said pin member and said sleeve member is permitted.
5. A hinge system as claimed in any one of claims 1-3 including attachment means for attachment to a first and second body to permit hingable connection therebetween.
6. A hinge system as claimed in any one of claims 1-3 wherein said lockable hinge system comprises two hinge elements, wherein one of said hinge elements includes said locking means and the other of said hinge elements includes said co-operating cam surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000430857A CA1188465A (en) | 1983-06-21 | 1983-06-21 | Locking hinge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000430857A CA1188465A (en) | 1983-06-21 | 1983-06-21 | Locking hinge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188465A true CA1188465A (en) | 1985-06-11 |
Family
ID=4125521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000430857A Expired CA1188465A (en) | 1983-06-21 | 1983-06-21 | Locking hinge |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1188465A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992020181A1 (en) * | 1991-05-06 | 1992-11-12 | Motorola, Inc. | Hinge apparatus having a self-latching hinge shaft for foldable radiotelephones |
-
1983
- 1983-06-21 CA CA000430857A patent/CA1188465A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992020181A1 (en) * | 1991-05-06 | 1992-11-12 | Motorola, Inc. | Hinge apparatus having a self-latching hinge shaft for foldable radiotelephones |
| GB2260572A (en) * | 1991-05-06 | 1993-04-21 | Motorola Inc | Hinge apparatus having a self-latching hinge shaft for foldable radiotelephones |
| AU658657B2 (en) * | 1991-05-06 | 1995-04-27 | Motorola, Inc. | Hinge apparatus having a self-latching hinge shaft for foldable radiotelephones |
| GB2260572B (en) * | 1991-05-06 | 1995-09-06 | Motorola Inc | Hinge apparatus having a self-latching hinge shaft for foldable radiotelephones |
| US5629979A (en) * | 1991-05-06 | 1997-05-13 | Motorola, Inc. | Hinge apparatus having a self-latching hinge shaft for foldable radiotelephones |
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|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |