EP1312748B1 - Light alloy die-cast shaft for tubular reduction gears used for roller shutters and blinds - Google Patents

Light alloy die-cast shaft for tubular reduction gears used for roller shutters and blinds Download PDF

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Publication number
EP1312748B1
EP1312748B1 EP02425663A EP02425663A EP1312748B1 EP 1312748 B1 EP1312748 B1 EP 1312748B1 EP 02425663 A EP02425663 A EP 02425663A EP 02425663 A EP02425663 A EP 02425663A EP 1312748 B1 EP1312748 B1 EP 1312748B1
Authority
EP
European Patent Office
Prior art keywords
flange
shaft
housing
light alloy
steel
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 - Lifetime
Application number
EP02425663A
Other languages
German (de)
French (fr)
Other versions
EP1312748A2 (en
EP1312748A3 (en
Inventor
Dante Postacchini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gaposa SRL
Original Assignee
Gaposa SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gaposa SRL filed Critical Gaposa SRL
Publication of EP1312748A2 publication Critical patent/EP1312748A2/en
Publication of EP1312748A3 publication Critical patent/EP1312748A3/en
Application granted granted Critical
Publication of EP1312748B1 publication Critical patent/EP1312748B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/68—Operating devices or mechanisms, e.g. with electric drive
    • E06B9/72—Operating devices or mechanisms, e.g. with electric drive comprising an electric motor positioned inside the roller
    • 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
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/68—Operating devices or mechanisms, e.g. with electric drive
    • E06B9/72—Operating devices or mechanisms, e.g. with electric drive comprising an electric motor positioned inside the roller
    • E06B2009/725—Operating devices or mechanisms, e.g. with electric drive comprising an electric motor positioned inside the roller with epicyclic or planetary gear train

Definitions

  • the present patent application relates to a die-cast shaft made of light alloy, such as aluminium or zinc alloy, designed for use on tubular reduction gears for roller shutters and blinds.
  • roller shutters are externally fixed on a tubular shaft that is dragged into rotation by means of a multistage epicyclic reduction gear, whose shaft is coupled to one end of the shaft, usually with the interposition of ad adapter housed and engaged inside the tubular shaft.
  • the shaft normally ends with a circular flange with three, regularly spaced peripheral holes, in which the three support pins of the three planetary gears of the epicyclic reduction gear are inserted and fixed.
  • the transversal cross-section of the pin cannot be increased as desired because the diameter of the corresponding housing on the planetary gears-holding flange must be lower than the diameter of the circumference internally tangent to the three holes where the pins are inserted. Moreover, the diameter of the steel flange cannot be increased, since this would involve the new dimensioning of the entire epicyclic reduction gear, with a cost increase not balanced by the cost reduction derived from using die-cast light alloy instead of steel for the shaft.
  • the purpose of the present invention is to find a solution to the constructive difficulties illustrated above by realising a light alloy die-cast shaft capable of being mounted on epicyclic reduction gears of standard dimensions that are commonly used for roller shutters and blinds.
  • the coupling pin externally has a series of three regularly spaced teeth or radial lobes designed to be housed inside corresponding notches located on the edge of the housing.
  • the presence of the three teeth or radial lobes on the coupling pin represents the overdimensioning of the pin both as regards the size of its transversal cross-section and the extension of its lateral walls, with consequent reduction of the torsional stresses and surface pressures affecting the pin because of the torque transmitted to the shaft by the reduction gear.
  • the shaft (1) of the invention is designed to be coupled with a steel flange (2) that holds the planetary gears, of standard type and dimensions, which features a series of three regularly spaced holes (3) for the introduction of three steel pins (4) that support the planetary gears (5) that form part of a standard epicyclic reduction gear.
  • the shaft (1) has a coupling pin (6) that externally features a series of three regularly spaced teeth or radial lobes (6a) housed inside corresponding notches (7a) along the edge of the housing (7) located in the centre of the flange (2).
  • the notches (7) are regularly spaced with respect to the three holes (3) on the flange (2).
  • the coupling pin (6) is made of light alloy and die-cast from one single piece with the shaft (1).
  • the shaft (1) has a flange (8) with a housing (9) capable of housing the coupling pin (10) that projects from the steel flange (2) that holds the planetary gears in opposite position to the planetary gears (5).
  • the flange (8) is made with light alloy and die-cast from a single piece with the shaft (1), while the pin (10) is made of steel, like the flange (2) and the pins (4) that support the planetary gears (5).
  • the steel pin (10) externally features a series of three regularly spaced teeth or radial lobes (10a) housed inside corresponding notches (9a) along the edge of the housing (9) located in the centre of the flange (8).

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Retarders (AREA)
  • General Details Of Gearings (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Continuous Casting (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

The present invention relates to a die-cast shaft (1) made of light alloy, such as aluminium or zinc alloy, designed for use on tubular reduction gears for roller shutters and blinds. The coupling pin (6) to be inserted into a suitable housing has a series of three regularly spaced external teeth or radial lobes (6a). <IMAGE>

Description

  • The present patent application relates to a die-cast shaft made of light alloy, such as aluminium or zinc alloy, designed for use on tubular reduction gears for roller shutters and blinds.
  • As it is known, roller shutters are externally fixed on a tubular shaft that is dragged into rotation by means of a multistage epicyclic reduction gear, whose shaft is coupled to one end of the shaft, usually with the interposition of ad adapter housed and engaged inside the tubular shaft.
  • The shaft normally ends with a circular flange with three, regularly spaced peripheral holes, in which the three support pins of the three planetary gears of the epicyclic reduction gear are inserted and fixed.
  • Such a shaft is shown in EP-1098063.
  • Some manufacturers prefer to use steel both for the shaft and the flange that holds the planetary gears. Others prefer to produce the shaft and the flange from a single monolithic steel part.
  • In order to reduce production costs of the shaft, it has been suggested and attempted to produce die-cast shafts of light alloy, such as aluminium or zinc alloy. This solution, however, has proved to be unreliable since the alloy parts that come in contact with the steel parts tend to suffer surface wear due to high pressures, thus impairing the correct operation of the mechanisms. In particular, it has been noted that the housings of the flange for the steel pins that hold the planetary gears tend to ovalise, if the flange is made of light alloy.
  • To overcome this inconvenience the flange was produced with steel and the shaft with light alloy; this solution, however, was not feasible since the aforementioned problem caused by the surface wear of alloy parts affected the pin, which forms an integral part of the shaft. In this case, the pin did not resist the torsional stress received from the planetary gears-holding flange to which it is matched.
  • On the other hand the transversal cross-section of the pin cannot be increased as desired because the diameter of the corresponding housing on the planetary gears-holding flange must be lower than the diameter of the circumference internally tangent to the three holes where the pins are inserted. Moreover, the diameter of the steel flange cannot be increased, since this would involve the new dimensioning of the entire epicyclic reduction gear, with a cost increase not balanced by the cost reduction derived from using die-cast light alloy instead of steel for the shaft.
  • The purpose of the present invention is to find a solution to the constructive difficulties illustrated above by realising a light alloy die-cast shaft capable of being mounted on epicyclic reduction gears of standard dimensions that are commonly used for roller shutters and blinds.
  • This objective has been achieved thanks to the present invention, which provides for the non-circular cross-section of the pin designed to transmit the twisting moment between the steel flange that holds the planetary gears and the light alloy die-cast shaft.
  • More precisely, the coupling pin externally has a series of three regularly spaced teeth or radial lobes designed to be housed inside corresponding notches located on the edge of the housing.
  • The presence of the three teeth or radial lobes on the coupling pin represents the overdimensioning of the pin both as regards the size of its transversal cross-section and the extension of its lateral walls, with consequent reduction of the torsional stresses and surface pressures affecting the pin because of the torque transmitted to the shaft by the reduction gear.
  • For major clarity the description of the shaft according to the present invention continues with reference to the enclosed drawings, which are intended for purposes of illustration and not in a limiting sense, whereby:
    • Fig. 1 is an exploded axonometric view of the shaft of the invention in a first preferred embodiment, in which the coupling pin is made of light alloy and moulded with the shaft from a single piece, and the pin housing is located on the steel flange that holds the planetary gears.
    • Fig. 2 is an exploded axonometric view of the shaft of the invention in a second preferred embodiment, in which the coupling pin is made of steel and projects from the flange that holds the planetary gears, and the pin housing is located on the light alloy die-cast shaft.
  • With reference to Fig. 1 the shaft (1) of the invention is designed to be coupled with a steel flange (2) that holds the planetary gears, of standard type and dimensions, which features a series of three regularly spaced holes (3) for the introduction of three steel pins (4) that support the planetary gears (5) that form part of a standard epicyclic reduction gear.
  • In the first preferred embodiment, the shaft (1) has a coupling pin (6) that externally features a series of three regularly spaced teeth or radial lobes (6a) housed inside corresponding notches (7a) along the edge of the housing (7) located in the centre of the flange (2).
  • In other words it can be said that the notches (7) are regularly spaced with respect to the three holes (3) on the flange (2).
  • The coupling pin (6) is made of light alloy and die-cast from one single piece with the shaft (1).
  • In the constructive version illustrated in Fig. 2 the shaft (1) has a flange (8) with a housing (9) capable of housing the coupling pin (10) that projects from the steel flange (2) that holds the planetary gears in opposite position to the planetary gears (5).
  • The flange (8) is made with light alloy and die-cast from a single piece with the shaft (1), while the pin (10) is made of steel, like the flange (2) and the pins (4) that support the planetary gears (5).
  • The steel pin (10) externally features a series of three regularly spaced teeth or radial lobes (10a) housed inside corresponding notches (9a) along the edge of the housing (9) located in the centre of the flange (8).
  • In other words it can be said that the teeth or radial lobes (10a) are regularly spaced with respect to the three holes (3) located on the flange (2).

Claims (3)

  1. A shaft designed for use on tubular epicyclic reduction gears of standard dimensions for roller shutters and blinds, of the type comprising a coupling pin (6, 10) to be introduced inside a suitable housing (7, 9), designed to transmit the torque from the flange (2) that holds the planetary gears to the shaft (1), characterised in that it is made of die-cast light alloy and the coupling pin (6, 10) externally features a series of three regularly spaced teeth or radial lobes (6a, 10a) housed inside corresponding notches (7a, 9a) located on the edge of the housing (7, 9); the teeth or radial lobes (6a, 10a) extending beyond the imaginary circumference that is internally tangent to the three holes (3) that are traditionally located on the flange (2) to house the steel pins (4) that support the planetary gears (5) of the epicyclic reduction gear, of which the flange (2) is an integral part.
  2. A shaft according to the preceding claim, characterised in that it is made of die-cast light alloy together with the pin (6), which externally features a series of three regularly spaced teeth or radial lobes (6a) housed inside corresponding notches (7a) located on the edge of the housing (7) in the centre of the flange (2).
  3. A shaft according to claim 1, characterised in that it incorporates a flange (8), which is die-cast from one single light alloy piece together with the shaft, featuring a housing (9) capable of housing the steel coupling pin (10) that projects from the steel flange (2) that holds the planetary gears in opposite position to the planetary gears (5); the steel pin (10) externally featuring a series of three regularly spaced teeth or radial lobes (10a) housed inside corresponding notches (9a) along the edge of the housing (9) located in the centre of the flange (8).
EP02425663A 2001-11-20 2002-10-30 Light alloy die-cast shaft for tubular reduction gears used for roller shutters and blinds Expired - Lifetime EP1312748B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMC20010113 2001-11-20
IT2001MC000113A ITMC20010113A1 (en) 2001-11-20 2001-11-20 DIE CAST FORCE IN LIGHT ALLOY FOR TUBULAR GEAR MOTORS FOR THE HANDLING OF ROLLING SHUTTERS AND ROLLING AWNINGS.

Publications (3)

Publication Number Publication Date
EP1312748A2 EP1312748A2 (en) 2003-05-21
EP1312748A3 EP1312748A3 (en) 2003-06-18
EP1312748B1 true EP1312748B1 (en) 2005-03-16

Family

ID=11443476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425663A Expired - Lifetime EP1312748B1 (en) 2001-11-20 2002-10-30 Light alloy die-cast shaft for tubular reduction gears used for roller shutters and blinds

Country Status (4)

Country Link
EP (1) EP1312748B1 (en)
AT (1) ATE291147T1 (en)
DE (1) DE60203239T2 (en)
IT (1) ITMC20010113A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMC20050133A1 (en) * 2005-12-13 2007-06-14 Gaposa Srl EPICYCLOIDAL REDUCER WITH MORE MODULAR STAGES FOR TUBULAR GEARED MOTORS OF ROLLER SHUTTERS, ROLLERS AND THE LIKE.
EP2196601A1 (en) * 2008-12-12 2010-06-16 Unicum Transmission de Puissance Device for fixing a motor immersed in a swimming pool for moving roller shutters
US10337243B2 (en) 2017-04-10 2019-07-02 Mechoshade Systems, Llc Geared bracket for a window shade

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3207909C2 (en) * 1982-03-05 1992-04-16 Standard Elektrik Lorenz Ag, 7000 Stuttgart Device for coupling a drive motor to a drive shaft of a device
DE3536160A1 (en) * 1985-10-10 1987-04-23 Starcke Zuendwarenfab SIDE TRAIN ROLLER
WO1998009045A1 (en) * 1996-08-28 1998-03-05 De Groot, Willem Electrical blind control
DE19953200A1 (en) * 1999-11-05 2001-05-10 Valeo Auto Electric Gmbh Tubular motor
DE29921077U1 (en) * 1999-12-01 2001-04-12 Roma Rolladensysteme Gmbh Device for closing building openings

Also Published As

Publication number Publication date
EP1312748A2 (en) 2003-05-21
EP1312748A3 (en) 2003-06-18
DE60203239T2 (en) 2006-02-09
ATE291147T1 (en) 2005-04-15
ITMC20010113A1 (en) 2003-05-20
DE60203239D1 (en) 2005-04-21

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