AU2011200835B2 - Operating device for rotating a winding roller of a window blind - Google Patents

Abstract

OPERATING DEVICE FOR ROTATING A WINDING ROLLER OF A WINDOW BLIND An operating device for rotating a winding roller (14) 5 of a window blind (1), includes an upright rotating shaft (2) rotatable to cause rotation of the winding roller (14) and having thread segments (241,242), a sleeve shell (31) surrounding the rotating shaft (2) , upper and lower coupling members (34, 37) anchored on the sleeve shell 10 (31) andeachhavinggripends (344,374) andcammedsurfaces (345, 375) confronting the thread segments (241,242) and the sleeve shell (31), and an actuating member (32) having a camming surfaces (326, 327) disposed to be moved upward or downward to make an upper or lower friction engagements 15 between the upper coupling member (34) and rotating shaft (2), and between the lower coupling member (37) and the rotating shaft (2) for rotating the rotating shaft (2) [--343 (345) 313 317,314 "322 1--314 334 335 32 34 318 32 19 331 316 3 8 (375) 3

Description

AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant(s): SHIH-MING LIN Invention Title: Operating device for rotating a winding roller of a window blind The following statement is a full description of this invention, including the best method for performing it known to me/us: 1 OPERATING DEVICE FOR ROTATING A WINDING ROLLER OF A WINDOW BLIND This invention relates to a window blind, more particularly to an operating device for rotating a winding 5 shaft of a window blind to wind up or winding down a curtain cloth. A conventional window blind generally includes a winding roller, a curtain cloth extending downwardly from the roller, and a ring chain (or cord) disposed on an end 10 portion of the roller and extending downwardly. A user can pull the ring chain to rotate the winding roller such that the curtain cloth can be wound upwardly or downwardly. However, it is of no rare occurrence that the ring chain might wrap around a child' s neck if the child sticks his/her 15 head in the loop formed by the ring chain, thereby causing strangling incident. Another window blind such as those disclosed in EP Application No. 10157918. 3 and U.S. Patent Application No. 12/696173, is provided with an operating rod to replace the ring chain. The operating rod extends 20 vertically and has an upper end coupled with a winding roller by a rotation transmitting mechanism such that vertical rotation of the operating rod results in horizontal rotation of the winding roller, and a lower end coupled with a hinged handle that is manipulated to 25 rotate the operating rod. Since the hinged handle is disposed remote from the winding roller, a force applied to the handle is hard to be transmitted to the rotation 5937438_1 (GHMatters) P86523.AU DENISET 2 transmitting mechanism, thereby rendering the operation laborious and inefficient. An embodiment of the present invention may provide an operating device for rotating a winding roller of a window 5 blind which is operable easily and smoothly, and which is suitable for winding a relatively long curtain cloth. According to a first aspect of the invention there is provided an operating device for rotating a winding roller of a window blind, the winding roller being rotatable 10 relative to a headrail about a horizontal axis for winding up or winding down a curtain cloth, said operating device comprising: a rotating shaft which is adapted tobe coupled with a winding roller of a window blind such that a counterclockwise or clockwise rotation of the rotating 15 shaft about an upright axis results in horizontal rotation of the winding roller for a corresponding winding-up or winding-down of a curtain cloth. The rotating shaft has a shaft body having upper and lower thread segments. A sleeve shell is disposed to surround and permit the shaft 20 body to be rotatable relative thereto so as to cooperatively define an accommodation space, and extends in a direction of the upright axis to terminate at upper and lower peripheral ends. Upper and lower coupling members are disposed in the accommodation space. Each of the upper 25 and lower coupling members includes an anchored end anchoredonthe sleeve shell, andat least one fingerportion which extends from the anchored end to terminate at a grip 5937438_1 (GHMatters) P86523.AU DENISET 3 end, andwhich has a cammed surface that radially confronts the sleeve shell. The grip end has an engageable region which radially confronts a corresponding one of the upper and lower thread segments such that an upper friction 5 engagement between the engageable region of the upper coupling member and the upper thread segment permits the counterclockwise rotation of the rotary shaft when a manual force is applied to move the sleeve shell upward, and such that a lower friction engagement between the engageable 10 region of the lower coupling member and the lower thread segment permits the clockwise rotation of the rotary shaft when a manual force is applied to move the sleeve shell downward. An actuating member is disposed in the accommodation space, is movable relative to the upper and 15 lower coupling members in the direction of upright axis, and has upper and lower inner tubular wall portions, each of which has a camming surface that is configured to mate with the cammed surface of a respective one of the upper and lower coupling members such that, when the actuating 20 member is moved upward from a non-actuating position to an upper actuating position, the engageable region of the upper coupling member is pressed to make the upper friction engagement with the upper thread segment as a result of an upper cam action between the upper camming and cammed 25 surfaces, and such that, when the actuating member is moved downward from the non-actuating position to a lower actuating position, the engageable region of the lower 5937438_1 (GHMatters) P86523.AU DENISET 4 coupling member is pressed to make the lower friction engagement with the lower thread segment as a result of a lower cam action between the lower camming and cammed surfaces. 5 In an embodiment, a control member having an actuating end which is configured to axially move said actuating member among the non-actuating position, the upper actuating position and the lower actuating position, and an operating end which is radially opposite to said 10 actuating end, and which is disposed externally of said sleeve shell to be manually operable. In an embodiment, said sleeve shell has a shell wall defining said accommodation space, and having an elongated slot extending in the direction of upright axis to terminate 15 at upper and lower retaining ends that extend circumferentially, said control member having a guided portion which is configured to extend through, and be slidable relative to said elongated slot so as to permit said actuating end to move axially, said guided portion 20 being further configured to be angularly displaceable to an upper locked position, where said guided portion is retained in said upper retaining end to hold said actuating member at the upper actuating position, and to a lower locked position, where said guided portion is retained 25 in said lower retaining end to hold said actuating member at the lower actuating position. In an embodiment, said guided portion is configured 5937438_1 (GHMatters) P86523.AU DENISET 5 to be a nut which is disposed between said upper and lower inner tubular wall portions, and which extends radially from said actuating member and into said elongated groove, said control member including a bolt which has a first 5 end that is threadedly engaged in said nut, and a second end radially opposite to said first end, and a knob which is connected to said second end and which is configured to cover said elongated slot. In an embodiment, each of said upper and lower 10 coupling members includes a plurality of said finger portions which are angularly displaced from each other about the upright axis, and which are configured such that said grip ends of each of said upper coupling member are vested with a biasing force that urges said corresponding 15 engageable regions to move away from a corresponding one of said upper and lower thread segments. In an embodiment, device further comprises first and second biasing springs disposed to brace said actuating member inthe directionof upright axis byvirtue of downward 20 and upward biasing forces exerted upon upper and lower tubular ends of said actuating member, respectively. In an embodiment, said anchored end of each of said upper and lower coupling members is in frictional engagement with and slidable relative to said sleeve shell, 25 said operating device further comprising a third biasing spring disposed to bias said anchored end of said upper coupling member toward said upper tubular end of said 5937438_1 (GHMatters) P86523.AU DENISET 6 actuating member while counteracting the biasing action of said first biasing spring, and a fourth biasing spring disposed to bias said anchored end of said lower coupling member toward said lower tubular end of said actuating 5 member while counteracting the biasing action of said second biasing spring. In an embodiment, said first and second biasing springs are respectively disposed between said anchored end of said upper coupling member and said upper tubular 10 end, and between said anchored end of said lower coupling member and said lower tubular end, said third and fourth biasing springs being respectively disposed between said upper peripheral end and said anchored end of said upper coupling member, and between said lower peripheral end 15 and said anchored end of said lower coupling member. In an embodiment, said sleeve shell has an inner shell wall surface which confronts said shaft body, and which is interposedbetweensaidupper andlowerperipheralends, and upper and lower abutment ledges which are disposed 20 on said inner shell wall surface and respectively between said anchored end of said upper coupling member and said upper tubular end, and between said anchored end of said lower coupling member and said lower tubular end, so as to restrict movement of said upper and lower coupling 25 members in the direction of upright axis. Other features and advantages of embodiments of the present invention will become apparent in the following 5937438_1 (GHMatters) P86523.AU DENISET 7 detailed description of the preferred embodiment of the invention, withreference to the accompanyingnon-limiting drawings, in which: Fig. lis afragmentaryperspectiveviewofthepreferred 5 embodiment of an operating device incorporated in a window blind according to this invention; Fig. 2 is a fragmentary exploded perspective view of the preferred embodiment; Fig. 3 is a fragmentary sectional view of the preferred 10 embodiment when an actuating member is in a non-actuating position; Fig. 4 is a sectional view taken along lines 4-4 of Fig. 3; Fig. 5 is a fragmentary sectional view of the preferred 15 embodiment when the actuating member is in an upper actuating position; Fig. 6 is a sectional view taken along lines 6-6 of Fig. 5; and Fig. 7 is a fragmentary sectional view of the preferred 20 embodimentwhen the actuatingmemberis ina lower actuating position. Referring to Figs. 1 to 3, the preferred embodiment of an operating device according to the present invention is shown to be mounted on a window blind 1 for rotating 25 a winding roller 14 of the window blind 1. The window blind 1 includes a horizontal extending headrail 11, two mounts 12 (only one is shown in Fig. 1) spacedly disposed on the 5937438_1 (GHMatters) P86523.AU DENISET 8 headrail 11, two rotary sleeves 13 (only one is shown in Fig. 1) rotatablymountedbetweenthemounts 12, thewinding roller 14 operatively coupled with the rotary sleeves 13 to be rotatable relative to the headrail 11 about a 5 horizontal axis for winding up or winding down a curtain cloth 15, and a coupling mechanism 16 operatively coupled with one of the rotary sleeves 13, and having a connecting end 161. The operating device of an embodiment of this invention is connected to the connecting end 161, and is 10 shown to comprise arotating shaft 2 and adrivingmechanism 3 mounted on the rotating shaft 2. The rotating shaft 2 has an upper shaft end 22 which is adapted to be connected to the connecting end 161 of the coupling mechanism 16 such that a counterclockwise 15 or clockwise rotation of the rotating shaft 2 about an upright axis transverse to a direction of the horizontal axis results in horizontal rotation of the winding roller 14 for a corresponding winding-up or winding-down of the curtain cloth, a shaft body 24 extending from the upper 20 shaft end 22 along the upright axis to terminate at a lower shaft end. The shaft body 24 has upper and lower thread segments 241, 242 which are disposed on an outer shaft surface thereof and which are proximate to the upper shaft end 22 and the lower shaft end, respectively. In this 25 embodiment, the shaft body 24 has external threads on its entire outer surface. The driving mechanism 3 includes a sleeve shell 31, 5937438_1 (GHMatters) P86523.AU DENISET 9 upperandlowercouplingmembers 34, 37, anactuatingmember 32, a control member 33, and first, second, third, and fourth biasing springs 35, 38, 36, 39. The sleeve shell 31 includes two shell halves matingly 5 connected to each other to have a barrel wall 311 which surrounds and permits the shaft body 24 to be rotatable relative thereto so as to cooperatively define an accommodation space 310, and which has an inner shell wall surface that confronts the shaft body 24, and that extends 10 in a direction of the upright axis to terminate at upper andlowerperipheral ends 312, 319. Upperandlowerabutment ledges 313, 314 aredisposedonthe inner shellwall surface. Further, the shell wall 311 has an elongated slot 316 extending in the direction of upright axis to terminate 15 at upper and lower retaining ends 317, 318 that oppositely extend circumferentially. The upper and lower coupling members 34, 37 disposed in the accommodation space 310 and proximate to the upper and lower peripheral ends 312, 319, respectively. Each 20 of the upper and lower coupling members 34, 37 includes an anchored end 343, 373 which is in frictional engagement with and slidable relative to the inner shell wall surface of the sleeve shell 31, and a plurality of finger portions 342, 372 which extend from the anchored end 343, 373 away 25 from a respective one of the upper and lower peripheral ends 312, 319 to terminate at grip ends 344, 374, which are angularly displaced from one another about the upright 5937438_1 (GHMatters) P86523.AU DENISET 10 axis, and which cooperatively have a cammed surface 345, 375 that radially confronts the sleeve shell 31. Each of the grip ends 344, 375 has an engageable region 346, 376 which radially confronts a corresponding one of the upper 5 andlower thread segments 241, 242. Thus, anupper friction engagement between the engageable regions 346 of the upper coupling member 34 and the upper thread segment 241 permits the counterclockwise rotation of the rotary shaft 2 when amanual force is applied tomove the sleeve shell 31 upward. 10 Alower friction engagement between the engageable regions 376 of the lower coupling member 37 and the lower thread segment 242 permits the clockwise rotation of the rotary shaft 2 when a manual force is applied to move the sleeve shell 31 downward. 15 The actuatingmember32 is disposed in the accommodation space 310 and has two sliding flange portions 322 which are slidable along the inner shell wall surface of the sleeve shell 31 to be movable relative to the upper and lower coupling members 34, 37 in the direction of upright 20 axis. The actuating member 32 has upper and lower inner tubular wall portions 324, 325 respectively extending from the sliding flange portions 322 to terminate at upper and lower tubularends. Eachoftheupperandlowerinner tubular wall portions 324, 325 has a camming surface 326, 327 that 25 is configured to mate with the cammed surfaces 345, 375 of a respective one of the upper and lower coupling members 34, 37. In this embodiment, the camming surfaces 326, 327 5937438_1 (GHMatters) P86523.AU DENISET 11 are configured to be conical that is diverged to the respective one of the upper and lower tubular ends. Therefore, when the actuating member 32 is moved upward fromanon-actuatingposition (Fig. 3) to anupper actuating 5 position (Fig. 5) , the engageable regions 346 of the upper coupling member 34 are pressed to make the upper friction engagement with the upper thread segment 241 as a result of an upper cam action between the upper camming and cammed surfaces 326, 345. When the actuating member 32 is moved 10 downward from the non-actuating position to a lower actuating position (Fig. 7) , the engageable regions 376 of the lower coupling member 37 are pressed to make the lower friction engagement with the lower thread segment 242 as a result of a lower cam action between the lower 15 camming and cammed surfaces 327, 375. The control member 33 has a nut 333, a bolt 331, and a knob 332. The nut 333 is disposed between the upper and lower inner tubular wall portions 324, 325, and extends radially from the actuating member 32 to be slidable in 20 the elongated groove 316 so as to serve as a guided portion 333. The nut 333 is further configured to be angularly displaceable to an upper locked position, where the nut 333 is retained in the upper retaining end 317 to hold the actuating member 32 at the upper actuating position, 25 and toalowerlockedposition, where thenut 333 is retained in the lower retaining end 318 to hold the actuating member 32 at the lower actuating position. The bolt 331 has a 5937438_1 (GHMatters) P86523.AU DENISET 12 first end 335 which is threadedly engaged in the nut 333 to serve as an actuating end 335, and a second end 334 radially opposite to the first end 335. The knob 332 is connected to the second end 334 and is configured to cover 5 the elongated slot 316 and to be disposed externally of the sleeve shell 31 to be manually operable. The first biasing spring 35 is disposed between the anchored end 343 of the upper coupling member 34 and the upper tubular end of the actuating member 32 while the 10 second biasing spring 38 is disposed the anchored end 373 of the lower coupling member 37 and the lower tubular end of the actuating member 32 so as to brace the actuating member 32 in the direction of upright axis by virtue of downward and upward biasing forces exerted upon upper and 15 lower tubular ends of the actuating member 32, respectively. The third biasing spring 36 is disposed between the upper peripheral end 312 and the anchored end 343 of the upper coupling member 34 to bias the anchored end 343 toward 20 the upper tubular end while counteracting the biasing action of the first biasing spring 35. The fourth biasing spring 39 is disposed between the lower peripheral end 319 and the anchored end 373 of the lower coupling member 37 to bias the anchored end 373 toward the lower tubular 25 end while counteracting the biasing action of the second biasing spring 38. Referring to Figs. 1, 3 and 4, when the actuating member 5937438_1 (GHMatters) P86523.AU DENISET 13 32 is in the non-actuating position, the grip ends 344, 374 of the upper and lower coupling members 34, 37 are loosely engaged with the upper and lower tubular ends of the actuating member 32 by the biasing action of the first 5 and second biasing springs 35, 38 so that the engageable regions 346, 376 are disengaged from the upper and lower thread segments 241, 242. Referring to Figs. 1, 2, 5 and 6, when it is desired to counterclockwise rotate the rotating shaft 2, the user 10 grips the driving mechanism 3 and pushes the control member 33 upward and angularly to permit the nut 333 to be retained in the upper retaining end 317 so as to hold the actuating member 32 at the upper actuating position. At this stage, by an upper cam action between the upper camming and cammed 15 surfaces 326, 345, the engageable regions 346 of the upper coupling member 34 are frictionally engaged with the upper thread segment 241, and the grip ends 344 are vested with a biasing force that urges the corresponding engageable regions 344 to move away from the upper thread segment 20 241. Subsequently, the user pushes the driving mechanism 3 upwardly to permit counterclockwise rotation of the rotating shaft 2 to thereby rotate the winding roller 14 for winding up the curtain cloth 15. It is noted that when the actuating member 32 is in the upper actuating position 25 as shown in Fig. 5, the lower coupling member 37 is disengaged from the actuating member 32, andmay be movable upward by the biasing action of the fourth biasing spring 5937438_1 (GHMatters) P86523.AU DENISET 14 39. By virtue of the lower abutment ledge 314, an excess upward movement of the lower coupling member 37 can be prevented. After the driving mechanism 3 is moved to reach a 5 predetermined height position, the user can push the control member 33 away from the upper locked position to permit the actuating member 32 back to the non-actuating position (Fig. 3) . The user pulls the driving mechanism 3 downward to a relatively low position, and pushes the 10 control member 33 again to the upper locked position for upwardly moving the driving mechanism 3 to counterclockwise rotate the rotating shaft 2. Specifically, during winding of the curtain cloth 15, the driving mechanism 3 is reciprocate upward and downward 15 along the rotating shaft 2 to continuously rotate the rotating shaft 2 in the same direction. Such operating device is conveniently and easily operated, particularly for winding a quite long curtain cloth 15 without the need to elongate the length of the rotating shaft 2. 20 Referring to Figs. 1, 2 and 7, similarly, when it is desired to wind down the curtain cloth 15, the actuating member 32 is moved downward and angularly displaced to permit the nut 333 to be retained in the lower retaining end 318 to hold the actuating member 32 at the lower 25 actuating position. Subsequently, the driving mechanism 3 is pushed downward to clockwise rotate the rotating shaft 2. 5937438_1 (GHMatters) P86523.AU DENISET 15 As illustrated, the operating device according to an embodiment of this invention is operable smoothly and conveniently, particularly being used for winding a relatively long curtain cloth. 5 For thepurposesofthisspecificationitwillbeclearly understood that the word "comprising" means "including but not limited to", and that the word "comprises" has a corresponding meaning. It is tobeunderstood that, ifanyprior artpublication 10 is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country. 15 5937438_1 (GHMatters) P86523.AU DENISET

Claims (9)

1. An operating device for rotating a winding roller of a window blind, the winding roller being rotatable relative to a headrail about a horizontal axis forwinding 5 up or winding down a curtain cloth, said operating device comprising: a rotating shaft having an upper shaft end which is adapted to be coupled with the winding roller such that acounterclockwiseorclockwise rotationofsaidrotating 10 shaft about an upright axis transverse to a direction of the horizontal axis results in horizontal rotation of the winding roller for a corresponding winding-up or winding-down of the curtain cloth, a shaft body extending from said upper shaft end along the upright axis to 15 terminate at a lower shaft end, said shaft body having upper and lower thread segments which are disposed on an outer shaft surface thereof and which are proximate to said upper and lower shaft ends, respectively; a sleeve shellwhichis disposedto surround andpermit 20 said shaft body to be rotatable relative thereto so as to cooperativelydefine an accommodation space, andwhich extends in a direction of the upright axis to terminate at upper and lower peripheral ends; upper and lower coupling members disposed in said 25 accommodation space and proximate to said upper and lower peripheral ends, respectively, each of said upper and lower coupling members including 5937438_1 (GHMatters) P86523.AU DENISET 1 7 an anchored end which is anchored on said sleeve shell and proximate to a respective one of said upper and lower peripheral ends, and at least one finger portion which extends from 5 said anchored end away from the respective one of said upper and lower peripheral ends to terminate at a grip end, and which has a cammed surface that radially confronts said sleeve shell, said grip end having an engageable region which radially 10 confronts acorrespondingoneof saidupper and lower thread segments such that an upper friction engagement between said engageable region of said upper coupling member and said upper thread segment permits the counterclockwise rotation of said 15 rotary shaft when a manual force is applied to move said sleeve shell upward, and such that a lower friction engagement between said engageable region of said lower coupling member and said lower thread segment permits the clockwise rotation of said 20 rotary shaft when a manual force is applied to move said sleeve shell downward; and an actuating member disposed in said accommodation space and movable relative to said upper and lower coupling members in the direction of upright axis, and 25 having upper and lower inner tubular wall portions, each of which has a camming surface that is configured to mate with said cammed surface of a respective one of said upper 5937438_1 (GHMatters) P86523.AU DENISET 1 8 and lower couplingmembers such that, when saidactuating member is moved upward from a non-actuating position to an upper actuating position, said engageable region of said upper coupling member is pressed to make the upper 5 friction engagement with said upper thread segment as a result of an upper cam action between said upper camming and cammed surfaces, and such that, when said actuating member is moved downward from the non-actuating position to a lower actuating position, said engageable region 10 of saidlower couplingmember ispressed tomake the lower friction engagement with said lower thread segment as a result of a lower cam action between said lower camming and cammed surfaces.

2. The operating device according to Claim 1, further 15 comprising: a control member having an actuating end which is configured to axially move said actuating member among the non-actuating position, the upper actuating position and the lower actuating position, and an operating end 20 which is radially opposite to said actuating end, and which is disposed externally of said sleeve shell to be manually operable.

3. The operating device according to Claim 1 or 2, wherein said sleeve shell has a shell wall defining said 25 accommodation space, and having an elongated slot extending in the direction of upright axis to terminate at upper and lower retaining ends that extend 5937438_1 (GHMatters) P86523.AU DENISET 1 9 circumferentially, said control member having a guided portion which is configured to extend through, and be slidable relative to said elongated slot so as to permit said actuating end to move axially, said guided portion 5 being further configured to be angularly displaceable to an upper locked position, where said guided portion is retained in said upper retaining end to hold said actuating member at the upper actuating position, and to a lower locked position, where said guided portion 10 is retained in said lower retaining end to hold said actuating member at the lower actuating position.

4. The operating device according to Claim 3, wherein said guided portion is configured to be a nut which is disposed between saidupper and lower inner tubularwall portions, 15 and which extends radially from said actuating member and into said elongated groove, said control member including a bolt which has a first end that is threadedly engaged in said nut, and a second end radially opposite to said first end, and a knob which is connected to said 20 secondendandwhichis configuredtocoversaidelongated slot.

5. The operating device according to any one of Claims 1 to 4, wherein each of said upper and lower coupling members includes a plurality of said finger portions 25 which are angularly displaced from each other about the upright axis, and which are configured such that said grip ends of each of said upper coupling member are vested 5937438_1 (GHMatters) P86523.AU DENISET 20 with a biasing force that urges said corresponding engageable regions to move away from a corresponding one of said upper and lower thread segments.

6. The operating device according to any one of Claims 5 1 to 5, further comprising first and second biasing springs disposed to brace said actuating member in the direction of upright axis by virtue of downward and upward biasing forces exerted upon upper and lower tubular ends of said actuating member, respectively. 10

7. The operating device according to any one of Claims 1 to 6, wherein said anchored end of each of said upper and lower coupling members is in frictional engagement with and slidable relative to said sleeve shell, said operating device further comprising a third biasing 15 spring disposed to bias said anchored end of said upper coupling member toward said upper tubular end of said actuating member while counteracting the biasing action of said first biasing spring, and a fourth biasing spring disposed to bias said anchored end of said lower coupling 20 member toward said lower tubular end of said actuating member while counteracting the biasing action of said second biasing spring.

8. The operating device according to Claim 6 or 7, wherein said first and second biasing springs are respectively 25 disposedbetween saidanchoredendofsaidupper coupling member and said upper tubular end, and between said anchored end of said lower coupling member and said lower 5937438_1 (GHMatters) P86523.AU DENISET 2 1 tubular end, said third and fourth biasing springs being respectively disposed between said upper peripheral end and said anchored end of said upper coupling member, and between said lower peripheral end and said anchored end 5 of said lower coupling member.

9. The operating device according to any one of Claims 1 to 8, wherein said sleeve shell has an inner shell wall surface which confronts said shaft body, and which is interposed between said upper and lower peripheral ends, 10 and upper and lower abutment ledges which are disposed on said inner shell wall surface and respectively between said anchored end of said upper coupling member and said upper tubular end, and between said anchored end of said lower coupling member and said lower tubular end, so as 15 to restrict movement of said upper and lower coupling members in the direction of upright axis. 1O.An operating device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings. 20 5937438_1 (GHMatters) P86523.AU DENISET