WO2008100167A2 - Pantograph extension arm for mounting a display screen, especially a flat television screen - Google Patents
Pantograph extension arm for mounting a display screen, especially a flat television screen Download PDFInfo
- Publication number
- WO2008100167A2 WO2008100167A2 PCT/PL2008/050004 PL2008050004W WO2008100167A2 WO 2008100167 A2 WO2008100167 A2 WO 2008100167A2 PL 2008050004 W PL2008050004 W PL 2008050004W WO 2008100167 A2 WO2008100167 A2 WO 2008100167A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- extension arm
- pantograph
- arm according
- axis
- hinges
- Prior art date
Links
- 230000000694 effects Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/08—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/2092—Undercarriages with or without wheels comprising means allowing depth adjustment, i.e. forward-backward translation of the head relatively to the undercarriage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
- F16M11/38—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by folding, e.g. pivoting or scissors tong mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M2200/00—Details of stands or supports
- F16M2200/06—Arms
- F16M2200/063—Parallelogram arms
Definitions
- Pantograph extension arm for mounting a display screen, especially a flat television screen
- the subject of the invention is a pantograph extension arm for mounting a display screen, especially a flat television screen.
- a flat display screen handle known from a patent description US 6 905 101 consists of two mounting elements, one of them is mounted In a fixed manner, another one holds the screen.
- One of the two interconnected mounting elements has a slideway. Alongside its horizontal axis a radially mounted screen can be moved. The screen rotational axis is located close to the screen gravity centre.
- the screen mounting plate, set as one element is connected by a handle support to the wall, The handle is the second element, through the set of two arms, hinge connected, with an option to move horizontally and parallel. The handle is manually moved in all dimensions.
- the aim of this invention is to introduce a motor drive into the above-described fixture, for all possible movements.
- the extension arm has a motor drive set that puts it in the required position - pulling it out, i.e. moving relative to the horizontal axis, and revolving it relative to the vertical axis.
- the extension arm has a head equipped with a motor that drives the element fitting the screen; the head puts the extension arm in a required position - through tilting it along the vertical axis.
- the extension arm has one electric motor, propelled with a screw-nut and through it - with a rack that works with gear wheels connected with the arms of the pantograph.
- the rack has the form of one Z-shaped raceway with two sections for the two gear wheels respectively.
- the extension arm has an electric motor propelled with a screw-nut, and through it - with a string working with the head.
- the string is spun onto a drum on the head, and connected rigidly to it, and is conducted through armouring and hinges to the rolls.
- the string has a tension-compensating element with which the screw's nut is connected.
- the head's axis is the axis of rotation of the two connectors and the axis of the drum.
- the extension arm has two electric motors driven with screws-nuts, and through them - racks working with gear wheels connected to the arms of the pantograph.
- the racks are in the form of two separate raceways for the two gears respectively.
- the two arms are connected with hinges to the two connectors, and between them there is a shackle, fitted with hinges, with the rigidly fitted head with the TV screen fitting element.
- the two electric motors are started at the same time.
- a string spun onto drums fitted on one of the gears and one of the hinges' axis, respectively.
- Another alternative is the use of a rigid arm to synchronize the unfolding of the arm and the connector during the pulling out motion.
- One end of the rigid arm is connected to a gear and the other end is fitted to the arm near its axis of rotation in the hinge.
- the advantage of the solution offered by this invention is a possibility to mechanize the extension arm completely and to introduce remote control of it.
- Fig. 1 - extension arm with one motor for the pull-out drive
- Fig. 2 cross section of the TV screen fitting set
- Fig. 3 a variant of the extension arm with two motors for the pull-out drive, with the head on an additional shackle and the string spun onto two drums
- Fig. 4 a variant of the extension arm with two motors for the pull-out drive, with the head on an additional shackle and the string connected to the gear wheel.
- the extension arm for fitting a display screen consists of a parallelogram formed by the two arms 1 , fitted into the fitting surface so as to rotate, and the two connectors 2, joined by hinges 3 to the arms 1.
- the arms 1 are set on axes 4.
- the two arms 1 and the two connectors 2 form the expandable pantograph set.
- connectors 2 opposite to their ends connected with hinges to the arms 1 , are joined together with hinges on axis 5, and in the area of their hinged joint a fixture for fitting the movable screen is situated, directly or with the use of a head.
- gear wheels 7 are placed, connected to arms 1 , working with racks 6 that are in the form of a common Z-shaped raceway.
- the electric motor 8 is used, which through the screw 9 and nut 10 drives racks 6 that work with gear wheels 7.
- the string 12 is used, spun onto drum 11 set on the axis 5.
- the string 12 through the armouring 13 goes through hinges 13 to rolls 14.
- the ends of string 12 are set in the pull compensating element 15.
- the string 12 is moved from motor 16 which through screw 17 drives nut 18 connected to the pull compensating element 15.
- the TV screen is set on the fitting element 19 of the head 20 that is driven by motor 21 and used to tilt the screen along the vertical axis.
- the head 20 forms the axis 5 of arms 2.
- Linear movement of racks 6 causes the gear wheels 7, working in tandem with the racks, and the arms 2 to rotate, which results in the expansion or contraction of the pantograph set and in pulling out or drawing in the TV screen.
- Linear movement of the pull compensating element 15 makes the string 12 move and the head 20 rotate around the axis 5, and as a result - the TV screen to rotate around the vertical axis.
- the pair of arms 101 are connected with hinges 3 to the pair of connectors 102, between which there is shackle 22, fitted with hinges 3, with a rigidly set head 20 and the TV screen fitting element 19.
- the two racks 106 working with the gear wheels 7 are separate elements driven with separate motors 8 and 8a.
- both motors 8 and 8a simultaneously drive both racks 106 through screws 9 and nuts 10.
- the string 12 is used, spun onto drums 111 fitted on one of the gears 7 and on the axis one of the hinges 3, respectively.
- starting motors 8 and 8 a at the same time results in a linear movement of racks 106, rotation of gears 7 and arms 101 , and in effect - expanding or contracting of the pantograph set and pulling out or drawing in the TV screen.
- Starting one motor, 8 or 8a causes the rotation of the pantograph's half formed by the arm 101 and the connector 102, and the rotation of the head 20, and in effect - rotation of the TV screen around the vertical axis.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The extension arm is characterized by a motor drive set (8), (8a), (16), which is operated to put the arm in the required position pulling it out, i.e. moving it relative to the horizontal axis and rotating relative to the vertical axis; it also has a head (20), equipped with a motor (21) driving the fitting element (19) of the screen, which is operated to put the extension arm in the required position tilting it along the vertical axis. To perform the pulling-out motion, the extension arm is equipped with one electric motor (8) driving through the screw (9) the nut (10), and through it the rack (6) working with gear wheels (7) connected to the arms (1) of the pantograph.
Description
Pantograph extension arm for mounting a display screen, especially a flat television screen
The subject of the invention is a pantograph extension arm for mounting a display screen, especially a flat television screen.
A flat display screen handle known from a patent description US 6 905 101 , consists of two mounting elements, one of them is mounted In a fixed manner, another one holds the screen. One of the two interconnected mounting elements has a slideway. Alongside its horizontal axis a radially mounted screen can be moved. The screen rotational axis is located close to the screen gravity centre. In a variant, the screen mounting plate, set as one element, is connected by a handle support to the wall, The handle is the second element, through the set of two arms, hinge connected, with an option to move horizontally and parallel. The handle is manually moved in all dimensions.
The aim of this invention is to introduce a motor drive into the above-described fixture, for all possible movements.
The essence of this solution is that the extension arm has a motor drive set that puts it in the required position - pulling it out, i.e. moving relative to the horizontal axis, and revolving it relative to the vertical axis. In addition, the extension arm has a head equipped with a motor that drives the element fitting the screen; the head puts the extension arm in a required position - through tilting it along the vertical axis.
For the pulling out motion, the extension arm has one electric motor, propelled with a screw-nut and through it - with a rack that works with gear wheels connected with the arms of the pantograph. The rack has the form of one Z-shaped raceway with two sections for the two gear wheels respectively.
For the revolving motion relative to the vertical axis, the extension arm has an electric motor propelled with a screw-nut, and through it - with a string working with the head.
The string is spun onto a drum on the head, and connected rigidly to it, and is conducted through armouring and hinges to the rolls.
The string has a tension-compensating element with which the screw's nut is connected.
The head's axis is the axis of rotation of the two connectors and the axis of the drum.
Alternatively, for the pulling out motion, the extension arm has two electric motors driven with screws-nuts, and through them - racks working with gear wheels connected to the arms of the pantograph.
The racks are in the form of two separate raceways for the two gears respectively.
The two arms are connected with hinges to the two connectors, and between them there is a shackle, fitted with hinges, with the rigidly fitted head with the TV screen fitting element.
For the pulling-out motion, the two electric motors are started at the same time. To synchronize the unfolding of the arm and the connector during the pulling out motion, there is a string, spun onto drums fitted on one of the gears and one of the hinges' axis, respectively.
Another alternative is the use of a rigid arm to synchronize the unfolding of the arm and the connector during the pulling out motion. One end of the rigid arm is connected to a gear and the other end is fitted to the arm near its axis of rotation in the hinge.
For the revolving motion relative to the vertical axis, the electric motors are started separately.
The advantage of the solution offered by this invention is a possibility to mechanize the extension arm completely and to introduce remote control of it.
The solution according to this invention is presented in the examples in the drawings, where the figures show:
Fig. 1. - extension arm with one motor for the pull-out drive,
Fig. 2 - cross section of the TV screen fitting set,
Fig. 3 - a variant of the extension arm with two motors for the pull-out drive, with the head on an additional shackle and the string spun onto two drums, Fig. 4 - a variant of the extension arm with two motors for the pull-out drive, with the head on an additional shackle and the string connected to the gear wheel.
The extension arm for fitting a display screen consists of a parallelogram formed by the two arms 1 , fitted into the fitting surface so as to rotate, and the two connectors 2, joined by hinges 3 to the arms 1. The arms 1 are set on axes 4. The two arms 1 and the two connectors 2 form the expandable pantograph set.
The ends of connectors 2, opposite to their ends connected with hinges to the arms 1 , are joined together with hinges on axis 5, and in the area of their hinged joint a fixture for fitting the movable screen is situated, directly or with the use of a head.
On axes 4 gear wheels 7 are placed, connected to arms 1 , working with racks 6 that are in the form of a common Z-shaped raceway.
To pull the extension arm out, that is to move the pantograph relative to the horizontal axis, the electric motor 8 is used, which through the screw 9 and nut 10 drives racks 6 that work with gear wheels 7.
To rotate the extension arm relative to the vertical axis, the string 12 is used, spun onto drum 11 set on the axis 5. The string 12 through the armouring 13 goes through hinges 13 to rolls 14. The ends of string 12 are set in the pull compensating element 15. The string 12 is moved from motor 16 which through screw 17 drives nut 18 connected to the pull compensating element 15.
The TV screen, not shown in the picture, is set on the fitting element 19 of the head 20 that is driven by motor 21 and used to tilt the screen along the vertical axis. The head 20 forms the axis 5 of arms 2.
Linear movement of racks 6 causes the gear wheels 7, working in tandem with the racks, and the arms 2 to rotate, which results in the expansion or contraction of the pantograph set and in pulling out or drawing in the TV screen.
Linear movement of the pull compensating element 15 makes the string 12 move and the head 20 rotate around the axis 5, and as a result - the TV screen to rotate around the vertical axis.
In the alternative presented in fig. 3, the pair of arms 101 are connected with hinges 3 to the pair of connectors 102, between which there is shackle 22, fitted with hinges 3, with a rigidly set head 20 and the TV screen fitting element 19. The two racks 106 working with the gear wheels 7 are separate elements driven with separate motors 8 and 8a.
To pull the extension arm out, i.e. to move the pantograph relative to the horizontal axis, both motors 8 and 8a simultaneously drive both racks 106 through screws 9 and nuts 10.
To synchronize the unfolding of the arm 101 and the connector 102, the string 12 is used, spun onto drums 111 fitted on one of the gears 7 and on the axis one of the hinges 3, respectively.
In this embodiment, starting motors 8 and 8 a at the same time results in a linear movement of racks 106, rotation of gears 7 and arms 101 , and in effect - expanding or contracting of the pantograph set and pulling out or drawing in the TV screen.
Starting one motor, 8 or 8a, causes the rotation of the pantograph's half formed by the arm 101 and the connector 102, and the rotation of the head 20, and in effect - rotation of the TV screen around the vertical axis.
In furher embodiment presented in fig. 4, instead of the string 112 an additional rigid arm 101a is used, one of its ends connected to the gear 7 and the other fitted to the arm 101 near its axis of rotation in the hinge 3.
Claims
1. Pantograph extension arm for mounting a display screen, especially a flat television screen, fitted onto a vertical back wall,
- consisting of a parallelogram formed by a pair of arms, set in the fitting surface so as to rotate, and a pair of connectors joined by hinges, forming the expandable pantograph set, in which the ends of connectors, opposite to their ends connected with hinges to the arms, are joined together with hinges, and in the area of their hinged joint a fixture for fitting the movable screen is situated characterized in that
- there is a motor drive set (8), (8a), (16), that puts the extension arm in the required position - pulling it out or moving relative to the horizontal axis and rotating it relative to the vertical axis,
- there is a head (20) equipped with a motor (20) driving the screen fitting element (19), which puts the extension arm in the required position - tilting it along the vertical axis.
2. Pantograph extension arm according to claim 1 , characterized in that there is one electric motor (8) to perform the pulling-out function, driven with a screw (9), a nut (10), and through it - a rack (6) working with gear wheels (7) connected to the arms (1) of the pantograph.
3. Pantograph extension arm according to claims 1 to 2, characterized in that the rack (6) has the form of one Z-shaped raceway with two sections for each of the two gears (7) respectively.
4. Pantograph extension arm according to claims 1 to 3, characterized in that there is an electric motor (16) for the rotating movement around the vertical axis, driven with a screw (17), a nut (18), and through it - a string (12) working with the head (20).
5. Pantograph extension arm according to claims 1 to 4, characterized in that the string (12) is spun on the drum (11 ) set on the head (20), and goes through armouring (13) through hinges (3) to rolls (14).
6. Pantograph extension arm according to claims 1 to 6, characterized in that the string (12) has a pull compensating element (15) with which the nut (18) of the screw (17) is connected.
7. Pantograph extension arm according to claims 1 to 5, characterized in that the axis of the head (20) at the same time is the axis of rotation (5) of the pair of connectors (2) and the axis of the drum (11 ).
8. Pantograph extension arm according to claim 1 , characterized in that there are two electric motors, (8) and (8a), to perform the pulling-out function, driven through screws (9) - nuts (10), and through them - racks (106) working with gears (7) connected to the arms (101 ) of the pantograph.
9. Pantograph extension arm according to claim 8, characterized in that the racks (106) are in the form of two separate raceways for each of the two gears (7).
10. Pantograph extension arm according to claims 8 to 9, characterized in that the pair of arms (101 ) is connected with hinges (3) to the pair of connectors (102) between which there is a shackle (22) put in place with hinges (3), with a rigidly set head (20) with the fitting element (19) of the TV screen.
11. Pantograph extension arm according to claims 8 to 10, characterized in that, to perform the pulling-out motion, the two electric motors (8) and (8a) are started simultaneously.
12. Pantograph extension arm according to claims 8 to 11 , characterized in that, to synchronize the unfolding of the arm (101 ) and the connector (102) during the pulling-out motion, there is a string (112) spun onto drums (111) set on one of the gears (7) and on the axis of one of the hinges (3), respectively.
13. Pantograph extension arm according to claims 8 to 11 , characterized in that, to synchronize the unfolding of the arm (101) and the connector (102) during the pulling-out motion, there is a rigid arm (101a) connected to the gear (7) with one end and fitted to the arm (101 ) with the other, near its axis of rotation in the hinge (3).
14. Pantograph extension arm according to claims 1 to 3, characterized in that, to perform the rotation relative to the vertical axis, the electric motors (8) and (8a) are started separately.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL381735A PL381735A1 (en) | 2007-02-12 | 2007-02-12 | Pantograph jib for fixing of a display screen, especially flat TV screen |
PLP381735 | 2007-02-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008100167A2 true WO2008100167A2 (en) | 2008-08-21 |
WO2008100167A3 WO2008100167A3 (en) | 2008-10-23 |
Family
ID=39671781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/PL2008/050004 WO2008100167A2 (en) | 2007-02-12 | 2008-02-12 | Pantograph extension arm for mounting a display screen, especially a flat television screen |
Country Status (2)
Country | Link |
---|---|
PL (1) | PL381735A1 (en) |
WO (1) | WO2008100167A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008100166A2 (en) * | 2007-02-12 | 2008-08-21 | Grabania, Bogdan | Extension arm for mounting of display screen, especially a flat television screen |
CN111520573A (en) * | 2020-06-29 | 2020-08-11 | 张小辉 | Laser induction alarm for entrance guard |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050110911A1 (en) * | 2003-11-25 | 2005-05-26 | Childrey Joseph B. | Remotely controlled wall-mounted television bracket |
JP2005202155A (en) * | 2004-01-15 | 2005-07-28 | Sony Corp | Video display device and video display method |
EP1662193A2 (en) * | 2004-11-30 | 2006-05-31 | Vogel's Holding B.V. | Device suitable for supporting a component |
WO2007062214A2 (en) * | 2005-11-21 | 2007-05-31 | Clo Systems, Llc | Motorized mount system for repositioning a monitor |
EP1845301A2 (en) * | 2006-04-13 | 2007-10-17 | Samsung Electro-Mechanics Co., Ltd | Display extension apparatus |
EP1852645A1 (en) * | 2006-05-02 | 2007-11-07 | Samsung Electro-Mechanics Co., Ltd | Display rotation and extension apparatus and control method thereof |
-
2007
- 2007-02-12 PL PL381735A patent/PL381735A1/en not_active IP Right Cessation
-
2008
- 2008-02-12 WO PCT/PL2008/050004 patent/WO2008100167A2/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050110911A1 (en) * | 2003-11-25 | 2005-05-26 | Childrey Joseph B. | Remotely controlled wall-mounted television bracket |
JP2005202155A (en) * | 2004-01-15 | 2005-07-28 | Sony Corp | Video display device and video display method |
EP1662193A2 (en) * | 2004-11-30 | 2006-05-31 | Vogel's Holding B.V. | Device suitable for supporting a component |
WO2007062214A2 (en) * | 2005-11-21 | 2007-05-31 | Clo Systems, Llc | Motorized mount system for repositioning a monitor |
EP1845301A2 (en) * | 2006-04-13 | 2007-10-17 | Samsung Electro-Mechanics Co., Ltd | Display extension apparatus |
EP1852645A1 (en) * | 2006-05-02 | 2007-11-07 | Samsung Electro-Mechanics Co., Ltd | Display rotation and extension apparatus and control method thereof |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008100166A2 (en) * | 2007-02-12 | 2008-08-21 | Grabania, Bogdan | Extension arm for mounting of display screen, especially a flat television screen |
WO2008100166A3 (en) * | 2007-02-12 | 2008-11-13 | Grabania Bogdan | Extension arm for mounting of display screen, especially a flat television screen |
CN111520573A (en) * | 2020-06-29 | 2020-08-11 | 张小辉 | Laser induction alarm for entrance guard |
Also Published As
Publication number | Publication date |
---|---|
PL381735A1 (en) | 2008-08-18 |
WO2008100167A3 (en) | 2008-10-23 |
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