Classifications

• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
  • E05F15/00—Power-operated mechanisms for wings
  • E05F15/60—Power-operated mechanisms for wings using electrical actuators
  • E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
  • E05F15/665—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for vertically-sliding wings
  • E05F15/668—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for vertically-sliding wings for overhead wings
  • E05F15/681—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for vertically-sliding wings for overhead wings operated by flexible elongated pulling elements, e.g. belts
  • E05F15/686—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for vertically-sliding wings for overhead wings operated by flexible elongated pulling elements, e.g. belts by cables or ropes
• • E—FIXED CONSTRUCTIONS
  • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
  • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
  • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
  • E06B9/02—Shutters, movable grilles, or other safety closing devices, e.g. against burglary
  • E06B9/08—Roll-type closures
  • E06B9/11—Roller shutters
  • E06B9/17—Parts or details of roller shutters, e.g. suspension devices, shutter boxes, wicket doors, ventilation openings
  • E06B9/171—Rollers therefor; Fastening roller shutters to rollers
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
  • E05Y2900/00—Application of doors, windows, wings or fittings thereof
  • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
  • E05Y2900/106—Application of doors, windows, wings or fittings thereof for buildings or parts thereof for garages

Definitions

• the present invention relates to an apparatus for preventing a wire from slipping off a drum around which the wire is wound to open and close an overhead door (hereinafter, abbreviated to "door"), and more particularly, to a wire separation preventer for an overhead door, wherein a wire wound around a drum is prevented from slipping off the drum in such a manner that the wire is pulled in proportion to an unwinding speed of the wire when an overhead door is lowered through unwinding of the wire, whereas the wire is allowed to be consistently tensioned so that it can be safely wound onto the drum when the door is lifted, and the wire can be moved laterally to be aligned with a winding groove of the drum.
• door an overhead door
• a conventional overhead door 10 comprises a driving gear 11 fixed to one end of a horizontal rotational shaft 92, a pair of drums 9 installed at both ends of the rotational shaft 92 so that the drums simultaneously rotate as the driving gear 11 rotates, and wires 91 wound around the drums 9.
• Leading ends of the wires 91 are connected to both side portions of a lower end of the door 10, and the door 10 is constructed to be opened and closed while being lifted or lowered along tracks 12 when the wires 91 are wound onto or unwound from the drums 9.
• the driving gear 11 receives a rotational force by mean of a selected one of a manual type using a conventional chain and a handle and an electric-powered type using a chain and a motor, which are not shown in the figure.
• the conventional overhead door 10 has an advantage in that the entrance is fully opened to ensure a maximum entry space.
• the wires 91 wound around the drums 9 are not stopped and are continuously unwound and thus slip off the drums 9 in a case where upon lowering of the door 10, the lowering of the door is stopped due to the presence of an object below the door 10 or contact of the door with the tracks.
• the separation of the wires 91 from the drums 9 occurs when the door 10 is lowered, but hardly occurs when the door 10 is lifted since the wires 91 to be wound onto the drums 9 are tensioned due to the weight of the door 10.
• a process of separation of the wires 91 from the drums 9 will be discussed.
• the rotational force transmitted to the driving gear 11 causes the rotational shaft 92 to rotate, and the drums 9 installed at both the ends of the rotational shaft 92 simultaneously rotate. Accordingly, the wires 91 are unwound from the drums. Since the leading ends of the wires 91 to be unwound from the drums 9 are fixed to the lower portions of the door 10, the wires are tensioned due to the weight of the door 10 acting thereon while the door 10 is lowered along the tracks.
• An object of the present invention is to provide a wire separation preventer for an overhead door, which is installed below each of drums of the door to allow each wire unwound from the drum for lowering of the door to be tensioned and to continuously maintain tension in the wire by pulling the wire unwound from the drum even when the door that is being lowered is stopped, so that the wire is prevented from slipping off the drum.
• Another object of the present invention is to provide a wire separation preventer for an overhead door, wherein each tensioning unit is constructed to guide a wire while moving in accordance with a position of the wire wound onto or unwound from a relevant drum, so that the wire can be safely wound onto the drum all the time, and in a case of an electric-powered type using a chain and a motor, if tension is removed from a portion of the wire positioned between the tensioning unit and the door, rotation of the motor is immediately stopped and the unwinding of the wire from the drum is stopped, thereby preventing the wire from slipping off the drum.
• the present invention provides a wire separation preventer for an overhead door, which prevents each wire from slipping off a relevant one of a pair of drums fixed to both ends of a horizontal rotational shaft when the overhead door is lifted or lowered through winding or unwinding of the wire wound around the relevant drum.
• the wire separation preventer comprises a power transmission unit including a main gear, and an idle gear and a driven gear which operate together with the main gear; a supporting unit including a supporting tube coupled to the center of the driven gear to penetrate therethrough, and a moving tube inserted into the supporting tube to move in the right and left direction; and a tensioning unit including a rotary rod installed rotatably to penetrate through the moving tube and the center of the driven gear, a driving roller fixed to a leading end of the rotary rod, and a pressing roller disposed close to the driving roller for bringing the wire into close contact with the driving roller.
• the main gear is fixed to the rotational shaft, and a bracket to which the idle and driven gears are rotatably attached is also coupled to the rotational shaft.
• a bracket to which the pressing roller of the tensioning unit is rotatably attached is fitted around and coupled to a leading end of the moving tube. Further, the wire separation preventer is installed to allow the wire to be tensioned upon winding or unwinding of the wire so that the wire wound around the relevant one of the pair of the drums cannot slip off the drum.
• FIG. 1 is a perspective view showing an installed state of a wire separation preventer for an overhead door according to the present invention.
• FIG. 2 is a sectional front view showing a portion of FIG. 1.
• FIG. 3 is a sectional view of a tensioning unit for feeding a wire.
• FIG. 4 is a perspective view showing a state where an electronic power control unit is installed in a wire separation preventer for an overhead door according to another embodiment of the present invention.
• FIG. 5 is a sectional front view of a portion of FIG. 4.
• FIG. 6 is a schematic view showing a conventional overhead door.
• FIGS. 1 and 2 are a perspective view showing an embodiment of the wire separation preventer for the overhead door according to the present invention, and a sectional front view showing a portion of thereof.
• Reference numeral 1 designates the wire separation preventer
• reference numeral 2 designates a power transmission unit coupled to a rotational shaft 92 to which a driving gear 11 and a drum 9 are fixed
• reference numeral 3 designates a supporting unit
• reference numeral 4 designates a tensioning unit
• reference numerals 5 and 6 designate brackets.
• Each wire separation preventer 1 is installed such that each wire 91 wound around a relevant one of a pair of drums 9 fixed to both ends of the horizontal rotational shaft 92 is prevented from slipping off the relevant drum 9 when the door is lifted or lowered through winding or unwinding of the wire 91.
• the power transmission unit 2 includes a main gear 21, and an idle gear 22 and a driven gear 23 which operate together with the main gear 21.
• the main gear 21 is fixed to and rotates together with the rotational shaft 92 which causes the drum 9 to rotate.
• the idle and driven gears 22 and 23 are rotatably attached to the plate-shaped bracket 5 of which an upper portion is coupled to the rotational shaft 92 so that it is suspended from and supported by the rotational shaft not to rotate together therewith.
• a ring 13 is fixed to one side of the upper portion of the bracket 5 coupled to the rotational shaft 92, as shown in FIG. 2, to be always positioned between the main gear 21 and the ring 13.
• the supporting unit 3 includes a hollow supporting tube 31 coupled to the center of the driven gear 23 to penetrate therethrough, and a hollow moving tube 32 inserted into the supporting tube 31 to move in the right and left direction.
• One end of the supporting tube 31 is coupled to the bracket 5 so that the driven gear 23 rotatably attached to the bracket 5 is prevented from escaping therefrom.
• the supporting tube has a predetermined length so that after inserted into the other end of the supporting tube, the moving tube 32 can be horizontally extended out of and retracted into the other end.
• the tensioning unit 4 includes a rotary rod 43 installed to penetrate through the moving tube 32 and the center of the driven gear 23 and to rotate together with the driven gear 23, a driving roller 41 fixed to a leading end of the rotary rod 43, and a pressing roller 42 disposed close to the driving roller for bring the wire 91 into close contact with the driving roller 41.
• the rotary rod 43 is constructed to have a rectangular cross section at a portion thereof inserted into the driven gear 23 so that after insertion into the driven gear 23, the rotary rod 43 can rotate together with the driven gear 23 while sliding in the right and left direction.
• the bracket 6 to which the pressing roller 42 of the tensioning unit 4 is rotatably attached is fitted around and coupled to a circumferential surface of the leading end of the moving tube 32.
• the pressing roller 42 always abuts on the driving roller 41 so that the wire 91 interposed therebetween comes into close contact with the rollers.
• the rotational speed of the driving roller 42 rotated by the power transmission unit 2 and the length of the wire 91 unwound from or wound onto the drum 9 are major factors for generating tension that allows the wire 91 to be in close contact with an outer periphery of the drum 9.
• the numbers of teeth of the main gear 21, idle gear 22 and driven gear 23 of the power transmission unit 2 are adjusted depending on the size of the drum 9 so that the tension is always maintained in the wire 91.
• each wire separation preventer 1 is installed to allow each wire 91 wound around the relevant one of the pair of drums 9 to be tensioned so that the wire 91 does not slip off the relevant drum.
• the moving tube 32 of the supporting unit 3 with the tensioning unit 4 fixed thereto moves in the right and left direction while being extended out of or retracted into the supporting tube 31.
• the wire separation preventer 1 when the driving gear 11 is manually rotated using a conventional chain and handle which are not shown, the wire 91 wound around the drum 9 is unwound or wound in accordance with the rotation direction of the driving gear.
• the tensioning unit 4 causes the driving roller 41 fixed to the leading end of the rotary rod 43 to rotate, and the rotational force from the rotating driving roller 41 causes the wire 91, which is in close contact with the driving roller 41 by the pressing roller 42, to be pulled downward or raised toward the drum 9.
• a portion of the wire 91 positioned between the pressing roller 42 and the drum 9 is always tensioned and thus the wire 91 is prevented from slipping off the drum. Furthermore, a guide roller 8 is installed at an upper portion of the bracket 6 so that the wire 91 is safely guided into between the driving roller 41 and the pressing roller 42 of the tensioning unit 4 even though there is a change in the position of the wire 91 where the wire is unwound from or wound onto the drum 9.
• an upper coupling portion of the bracket 5 and the main gear 21 of the wire separation preventer 1 according to the present invention are formed in a bisected state and then coupled to the rotational shaft 92.
• the wire separation preventer can be conveniently installed on the existing rotational shaft 92 that has been previously installed.
• the pressing roller 42 of the tensioning unit 4 is installed on a support 46 through a shaft, and the support 46 brings the wire into close contact with the rollers by means of an adjustment bolt 44 fastened to the bracket 6 and a spring 45 interposed between the bolt 44 and the bracket 6. Accordingly, even when the driving roller 41 and the pressing roller 42 are worn due to long-term use thereof and thus the pressing force acting on the wire 91 is reduced, the wire is allowed to be always in close contact with the rollers by means of the elastic force of the spring 45. Therefore, it is not necessary to additionally adjust the pressing force of the pressing roller 42 in the future.
• a clutch bearing 7 is installed in the center of the driven gear 23.
• the clutch bearing 7 transmits the driving force to the driving roller 41 fixed to the leading end of the rotary rod 43 only when the wire 91 wound around the drum 9 is unwound therefrom, so that the wire 91 is pulled downward to be tensioned and thus prevented from slipping off the drum.
• the driving force is not transmitted from the clutch bearing 7 to the driving roller 41 fixed to the leading end of the rotary rod 43, so that only tension naturally produced due to the weight of the door 10 acts on the wire 91 which is in close contact with the driving roller 41 and the pressing roller 42. Accordingly, the driving force for rotating the drum 9 can be reduced.
• a supporting member 15 is attached to the bracket 6 of the tensioning unit 4.
• a catcher 14 that has one end movably installed to penetrate through the supporting member 15, and guide rollers 141 at a leading end thereof by which the wire 91 is caught.
• the wire separation preventer is further provided with an electric power control unit 19 including a lever 17 fixed perpendicularly to a trailing end of the catcher 14 and a spring 16 interposed to resiliently urging the lever 17 in one direction.
• the catcher 14 If the wire 91 that is moving downward from the tensioning unit 4 is not pulled by the weight of the door 10 any longer and then becomes loose, the catcher 14 is moved by the elastic force of the spring 16 in a direction designated by an arrow in Fig. 5. Thus, the lever 17 operates a switch 18 to shut off the electric power supplied to the motor. Consequently, the electric power control unit 19 causes the wire 91 not to be further unwound from the drum 9 and thus allows a failure to be early settled.
• each wire wound onto or unwound from the relevant drum is moved in a state where it is interposed between and in close contact with the driving roller and the pressing roller of the tensioning unit so that the wire is always tensioned. Consequently, the wire is in close contact with the outer periphery of the drum and thus is prevented from slipping off the drum. Since the tensioning unit is constructed to guide the wire while moving in accordance with the position of the wire wound onto or unwound from the drum, the wire can be safely wound onto the drum all the time.

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• Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Power-Operated Mechanisms For Wings (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Electric Cable Installation (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=19713846

Family Applications (1)

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Cited By (1)

Families Citing this family (3)

Citations (3)

• 2001
  • 2001-08-31 KR KR20010053655A patent/KR100415894B1/ko not_active IP Right Cessation
• 2002
  • 2002-08-30 WO PCT/KR2002/001639 patent/WO2003018949A1/en not_active Application Discontinuation

Patent Citations (3)

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