NL1036731C2

NL1036731C2 - Operating mechanism for umbrella.

Info

Publication number: NL1036731C2
Application number: NL1036731A
Authority: NL
Inventors: Chuan-Chin Yang; Chi-Sheng Huang
Original assignee: Chuan-Chin Yang; Chi-Sheng Huang
Priority date: 2009-03-19
Filing date: 2009-03-19
Publication date: 2010-09-21

Description

OPERATING MECHANISM FOR UMBRELLA

The present invention relates to umbrellas and more particularly, to an operating mechanism for umbrella, which uses screw rods and screw nuts to move the telescopic 5 umbrella shaft between the extended position and the received position, thereby moving the runner to open or close the umbrella canopy.

Many automatic umbrellas are commercially available. These conventional automatic umbrellas have drawbacks as follows: 10 1. When released the lock, the runner is suddenly forced by the spring force of the related spring member to push the umbrella stretchers against the umbrella ribs, opening the umbrella canopy in a rush. Sudden open of the umbrella canopy may injure other persons accidentally.

15 2. After the umbrella canopy is opened, the runner is not locked, and the umbrella canopy may be forced by a strong wind to collapse the umbrella stretchers and the umbrella ribs.

3. The spring member will start to deteriorate after a long use of the umbrella, affecting normal functioning of the umbrella.

20

The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide an operating mechanism for umbrella, which assures positive positioning and high safety when opening or closing the umbrella. It is another object of the present invention to provide an operating mechanism for umbrella, 25 which is durable in use.

To achieve these and other objects of the present invention, an operating mechanism is used in an umbrella comprising a hub and rib assembly, a runner, a plurality of stretchers pivotally connected between the ribs of the hub and rib assembly and the runner, 30 and a canopy stretched on the hub and rib assembly. The operating mechanism is operable to move the runner against the stretchers and to further force the ribs of the hub and rib assembly to open/close the canopy. The operating mechanism comprises a telescopic shaft, first and second screw nuts fixedly mounted in the telescopic shaft at different elevations, a third screw nut is fixedly mounted in the runner of the umbrella, a first screw rod threaded 35 through the first screw nut, a second screw rod threaded through the second screw nut and axially slidably connected to and rotatable with the first screw rod, a third screw rod threaded 1036731 2 through the third screw nut and axially slidably connected to and rotatable with the second screw rod, and a transmission mechanism connected to the first screw rod and operable to rotate the first screw rod.

5 Further, the transmission mechanism comprises a transmission gear set, and a drive member rotatable by a user to drive the transmission gear set, causing the transmission gear set to rotate the first, second and third screw rods and to further move the runner upwards or downwards.

In an alternate form of the present invention, a motor is provided for driving the io transmission gear set to rotate the first, second and third screw rods

The invention will now be further elucidated on the basis of the following figures, wherein: 15 FIG. 1 is an exploded view of an operating mechanism for umbrella in accordance with a first embodiment of the present invention.

FIG. 2 is a schematic assembly view of the operating mechanism for umbrella in accordance with the first embodiment of the present invention.

20 FIG. 3 is a schematic sectional view of the operating mechanism for umbrella in accordance with the first embodiment of the present invention.

FIG. 4 is a cross sectional view of the present invention, showing the first screw rod, second screw rod and third screw rod concentrically coupled together.

25 FIG. 5 is an exploded view of the transmission mechanism of the operating mechanism for umbrella in accordance with the first embodiment of the present invention.

FIG. 6 is a cross sectional view of the transmission mechanism of the operating 30 mechanism for umbrella in accordance with the first embodiment of the present invention.

FIG. 7 is a cross sectional view of a part of the first embodiment of the present invention, showing the gear of the first screw rod meshed with the transmission gears of the of the last gear holder of the transmission gear set.

FIG. 8 is a schematic drawing of the present invention, showing the runner moved 35 3 upwards and the stretchers extended outwards.

FIG. 9 is an exploded view of an operating mechanism for umbrella in accordance with a second embodiment of the present invention.

5 FIG. 10 is a schematic sectional view of the operating mechanism for umbrella in accordance with the second embodiment of the present invention.

FIG. 11 is an exploded view of the transmission mechanism of the operating 10 mechanism for umbrella in accordance with the second embodiment of the present invention.

Referring to FIGS. 1~8, an operating mechanism in accordance with a first embodiment is shown used in an umbrella comprising a hub and rib assembly 13, a runner 1, a plurality of stretchers 16 pivotally connected between the (ribs of the) hub and rib assembly 15 13 and the runner 1, and a canopy 10 stretched on the hub and rib assembly 13. When the runner 1 is moved upwards subject to the operation of the operating mechanism, the stretchers 16 are forced to move the hub and rib assembly in opening the canopy 10. On the contrary, when the runner 1 is moved downwards, the stretchers 16 are received together, causing the hub and rib assembly 13 to close the canopy 10.

20

The aforesaid operating mechanism comprises a plurality of hollow screw rods, i.e., the first screw rod 21, the second screw rod 22 and the third screw rod 23, a plurality of screw nuts, i.e., the first screw nut 31, the second screw nut 32 and the third screw nut 15, a telescopic shaft 4, and a transmission mechanism 6.

25

The first screw nut 31 and the second screw nut 32 are fixedly mounted inside the telescopic shaft 4 at different elevations. The third screw nut 15 is formed integral with or fixedly mounted in the inner diameter of the runner 1.

30 The first screw rod 21 is threaded through the first screw nut 31 and inserted into the second screw rod 22 (see FIG. 3), having a gear 211 fixedly located on its one end and meshed with the transmission mechanism 6 and a longitudinal sliding groove 212 for guiding axial movement of the longitudinal rib 221 the second screw rod 22 relative to the first screw rod 21. The second screw rod 22 is threaded through the second screw nut 32 (see FIG. 3), 35 having a longitudinal sliding groove 222 (see FIG. 4) for guiding axial movement of the third screw rod 23 relative to the second screw rod 22. The third screw rod 23 is threaded through 4 the inner thread 151 of the third screw nut 15 in the runner 1, having a longitudinal rib 231 axially slidably coupled to the longitudinal sliding groove 222 of the second screw rod 22.

The telescopic shaft 4 comprises a plurality of tubular shaft elements 41~45 that 5 slide one inside another, a cap 46. The bottom tubular shaft element, i.e., the first tubular shaft element 41 is fixedly connected to the transmission mechanism 6. The aforesaid first screw nut 31 is fixedly mounted in the first tubular shaft element 41 and meshed with the first screw rod 21 (see FIG. 3). The aforesaid second screw nut 32 is fixedly mounted inside the top tubular shaft element, the fifth tubular shaft element 45 and meshed with the second 10 screw rod 22. The fifth tubular shaft element 45 is inserted through the inner diameter 12 of the runner 1, having a longitudinal crevice 451, which receives a longitudinal rib 121 of the runner 1, and a top locating hole 452. The cap 46 is fastened to the top locating hole 452 of the top tubular shaft element 45 with a fastening device 453 for stopping the top end 232 of the third screw rod 23, having a top screw hole 462. Further, a holding down device 14 is 15 attached to the top side of the canopy 10 to hold down the canopy 10 on the cap 46 and the hub and rib assembly 13, having a threaded shank 141 threaded into the top screw hole 462 of the cap 46 (see FIGS. 1 and 3).

The transmission mechanism 6 comprises a transmission gear set 61, a drive 20 member 62, a housing 64 that houses the transmission gear set 61, a front cover 63 covered on one side of the housing 64, and a rear cover 65 covered on the other side of the housing 64. By means of rotating the drive member 62 clockwise or counter-clockwise, the transmission gear set 61 is driven to rotate the first screw rod 21 clockwise or counterclockwise.

25

When the drive member 62 is rotated clockwise or counter-clockwise, the transmission gear set 61 is driven to rotate the first screw rod 21 clockwise or counterclockwise, and the second screw rod 22 as well as the third screw rod 23 are rotated with the first screw rod 21, thereby causing the runner 1 to move upwards or downwards along the 30 third screw rod 23 to open or close the canopy 10. During rotation of the first screw rod 21, second screw rod 22 and third screw rod 23 of the operating mechanism, the third tubular shaft element 43 and the fifth tubular shaft element 45 are respectively moved with the first screw nut 31 and the second screw nut 32 to extend out or receive the telescopic shaft 4.

35 Further, as shown in FIGS. 5 and 6, the drive member 62 has a circular chamber 622 (see FIG. 6) and a plurality of teeth 6221 arranged around the inside wall of the circular 5 5 chamber 622.

The housing 64 is a tubular member having a plurality of longitudinal teeth 641 arranged around the inside wall.

The front cover 63 is fixedly mounted on the front side of the housing 64 with screws 66, having a center axle hole 631 (see FIG. 5), a plurality of pivot pins 632 perpendicularly extended from the front side thereof and equiangularly spaced around the center axle hole 631, and a plurality of gears 633 respectively pivotally mounted on the pivot I0 pins 632 and meshed with the teeth 6221 of the drive member 62..

The rear cover 65 is fixedly mounted on the rear side of the housing 64 with a screw 67, having an extension tube 652, an axial hole 6521 defined in the extension tube 652 for the passing of the first screw rod 21, and a locating block 6522 fastened to a 15 retaining hole 412 of the bottom tubular shaft element 41 of the telescopic shaft 4.

The transmission gear set 61 comprises a plurality of gear holders 611-614 each supporting a plurality of transmission gears 6112, 6121, 6131 and 6141. The gears 6112, 6121, 6131 and 6141 are meshed with the longitudinal teeth 641 of the housing 64. The first 20 gear holder 611 of the transmission gear set 61 further comprises an axle 610 pivotally coupled to the center axle hole 631 of the front cover 63, a driven gear 6111 fixedly mounted on the free end of the axle 610 and meshed with the gears 633 of the front cover 63, a front extension rod 6113 axially extended from the center of the driven gear 6111 and inserted through the drive member 62, and a retainer ring 6114 fastened to a locating groove 6115 25 around the periphery of the front extension rod 6113 to secure the front extension rod 6113 to the drive member 62. Further, the transmission gears 6141 of the last gear holder 614 are meshed with the gear 211 at the first screw rod 21 (see FIGS. 5 and 7).

When the drive member 62 of the transmission mechanism 6 is rotated clockwise 30 or counter-clockwise, the gears 633 of the front cover 63 are driven to rotate the driven gear 6111, causing the transmission gears 6112 to rotate the gear holders 612, 613 and 614, and therefore the transmission gears 6141 of the last gear holder 614 are forced to rotate the gear 211 and the first screw rod 21.

35 Referring to FIG. 3, the tubular shaft elements 41-45 of the telescopic shaft 4 have different diameters. Further, each of the tubular shaft element 41-45 has a tubular shaft 6 element body 415, 425, 435, 445 or 455, and a flange 414, 424, 434, 444 or 454 extending around the periphery of one end of the tubular shaft element body 415, 425, 435,445 or 455. The tubular shaft elements 41-45 are axially inserted through one another, allowing the telescopic shaft 4 to be alternatively set between the extended position and the received 5 position.

FIGS. 9~11 show an operating mechanism in accordance with a second embodiment of the present invention. According to this second embodiment, a motor 60 is used to substitute for the aforesaid drive member 62 of the transmission mechanism 6. The 10 motor 60 has a pinion 601 fixedly mounted on the output shaft (not shown) thereof. The transmission gear set 61 comprises a plurality of gear holders 612-614 each supporting a plurality of transmission gears 6121, 6131 and 6141. The gears 6121, 6131 and 6141 are meshed with the longitudinal teeth 641 of the housing 64. The gear holder 612 of the transmission gear set 61 further comprises a plurality of driven gear 6122 meshed with the 15 pinion 601 of the motor 60. Further, the transmission gears 6141 of the last gear holder 614 are meshed with the gear 211 at the first screw rod 21. Further, the motor 60, front cover 63, housing 64 and rear cover 65 of the transmission mechanism 6 are fixedly fastened together with a screw rod 68. Further, a battery (not shown) is installed to provide the motor 60 with the necessary working voltage. The battery can be a regular battery or storage battery.

20

As indicated above, the invention has the following features and advantages: 1. By means of manually rotating the drive member 62 or by means of controlling the motor 60, the transmission mechanism 6 is driven to rotate the screw rods 21-23, 25 causing the first screw nut 31 and the second screw nut 32 to move the telescopic shaft 4 and the third screw nut 15 to move the runner 1, and therefore the umbrella is opened or closed accurately. Because the screw rods 21-23 are disposed inside the telescopic shaft 4, they are kept from sight and well protected against outside dust.

30 2. When the screw rods 21-23 are rotated clockwise or counter-clockwise, the runner 1 is moved with the third screw nut 15 along the third screw rod 23 to close/open the umbrella. Therefore, a user can close/open the umbrella with less effort. 1

The invention assures high positioning stability and operation safety when 35 closing/opening the umbrella.

7 4. The invention has high structural strength against wind force, assuring high durability for long service.

5. The operating mechanism is practical for use in a folding umbrella.

5 .1 03673 1

Claims

1. Bedieningsmechanisme voor gebruik in een paraplu omvattende een naaf- en 5 baleinsamenstel, een loper, meerdere spanorganen scharnierbaar gekoppeld tussen baleinen van het naaf- en baleinsamenstel en de loper, en een op het naaf- en baleinsamenstel gespannen scherm, waarbij het bedieningsmechanisme bediend kan worden om de loper tegen de spanorganen aan te bewegen om de baleinen van het naaf- en baleinsamenstel verder te dwingen het scherm te openen/sluiten, welk 10 bedieningsmechanisme is voorzien van een eerste schroefstang, een tweede schroefstang, een derde schroefstang, een eerste schroefdraadmoer, een tweede schroefdraadmoer, een derde schroefdraadmoer, een telescopische steel en een transmissiemechanisme, waarin: de eerste schroefdraadmoer en de tweede schroefdraadmoer respectievelijk vast 15 gemonteerd zijn binnenin de telescopische steel op verschillende hoogtes; de derde schroefdraadmoer vast gemonteerd is in de loper; de eerste schroefstang door de eerste schroefdraadmoer heen geschroefd is en in 20 de tweede schroefstang is gestoken, waarin de eerste schroefstang voorzien is van een tandwiel dat vast geplaatst is op één uiteinde daarvan en ineengrijpt met het transmissiemechanisme en van een longitudinale schuifgleuf voor het geleiden van axiale beweging van de tweede schroefstang ten opzichte van de eerste schroefstang; 25 de tweede schroefstang door de tweede schroefdraadmoer geschroefd is, welke tweede schroefstang een longitudinale schuifgleuf omvat voor het geleiden van axiale beweging van de derde schroefstang ten opzichte van de tweede schroefstang; de derde schroefstang door de derde schroefdraadmoer geschroefd is, welke 30 derde schroefstang een longitudinale rib omvat die axiaal schuifbaar gekoppeld is met de longitudinale schuifgleuf van de tweede schroefstang; de telescopische steel meerdere buisvormige steelelementen omvat, die zijn genummerd als 1 tot en met 5 en geplaatst om in elkaar te schuiven, waarbij het vijfde 35 buisvormige steelelement van de telescopische steel door de loper wordt gestoken; 1036731 het transmissiemechanisme verbonden is met één uiteinde van de eerste schroefstang en bediend kan worden om de eerste schroefstang te roteren.A control mechanism for use in an umbrella comprising a hub and rib assembly, a runner, a plurality of tensioners pivotally coupled between ribs of the hub and rib assembly and the runner, and a screen tensioned on the hub and rib assembly, wherein the control mechanism is operated can be used to move the runner against the tensioning members to further force the ribs of the hub and rib assembly to open / close the screen, which operating mechanism is provided with a first threaded rod, a second threaded rod, a third threaded rod, a first threaded rod threaded nut, a second threaded nut, a third threaded nut, a telescopic handle and a transmission mechanism, wherein: the first threaded nut and the second threaded nut are respectively fixedly mounted inside the telescopic handle at different heights; the third threaded nut is fixedly mounted in the runner; the first threaded rod is screwed through the first threaded nut and is inserted into the second threaded rod, wherein the first threaded rod is provided with a gear fixedly mounted on one end thereof and engaging with the transmission mechanism and with a longitudinal sliding slot for guiding axial movement of the second threaded rod relative to the first threaded rod; The second threaded rod is screwed through the second threaded nut, which second threaded rod comprises a longitudinal slide slot for guiding axial movement of the third threaded rod relative to the second threaded rod; the third threaded rod is screwed through the third threaded nut, which third threaded rod comprises a longitudinal rib that is axially slidably coupled to the longitudinal sliding slot of the second threaded rod; the telescopic handle comprises a plurality of tubular handle elements which are numbered 1 to 5 and placed to slide into each other, the fifth tubular handle element of the telescopic handle being inserted by the runner; 1036731 the transmission mechanism is connected to one end of the first threaded rod and can be operated to rotate the first threaded rod.

2. Bedieningsmechanisme volgens conclusie 1, waarin het 5 transmissiemechanisme omvat: een huis, welk huis een buisvormig orgaan is dat meerdere longitudinale vertandingen omvat opgesteld rondom een binnenwand daarvan; ÏO een voorste afdekking, die vast is gemonteerd op een voorste zijde van het huis, welke voorste afdekking een centraal asgat omvat, meerdere scharnierpinnen die zich loodrecht uitstrekken vanaf een voorzijde daarvan en onder gelijke hoeken rondom het centrale asgat zijn geplaatst, en meerdere tandwielen die respectievelijk scharnierbaarzijn gemonteerd op de scharnierpinnen; 15 een achterste afdekking, die vast is gemonteerd op een achterzijde van het huis, welke achterste afdekking een als huls op de eerste schroefstang geschoven verlengingsbuis omvat, en een op het eerste buisvormige steelelement van de telescopische steel vastgemaakt richtstuk; 20 een transmissietandwielstel, waarin het transmissietandwielstel is voorzien van meerdere tandwielhouders, een veelvoud van stellen transmissietandwielen, die gemonteerd zijn op de tandwielhouders en ineengrijpen met de longitudinale vertandingen van het huis, waarin een eerste tandwielhouder van de tandwielhouders van het transmissietandwielstel 25 een as omvat, die scharnierbaar gekoppeld is met het centrale asgat van de voorste afdekking, en een aangedreven tandwiel, dat vast gemonteerd is op een distaai uiteinde van de as en ineengrijpt met de tandwielen van de voorste afdekking, waarin de transmissietandwielen van een laatste tandwielhouder van de tandwielhouders van het transmissietandwielstel ineengrijpen met het tandwiel bij de eerste schroefstang; en 30 een aandrijforgaan dat bediend kan worden om het transmissietandwielstel te roteren, waarin het aandrijforgaan een cirkelvormige kamer omvat en meerdere vertandingen, die zijn aangebracht in de cirkelvormige kamer en ineengrijpen met de tandwielen van de voorste afdekking. 35Operating mechanism as claimed in claim 1, wherein the transmission mechanism comprises: a housing, which housing is a tubular member comprising a plurality of longitudinal teeth arranged around an inner wall thereof; A front cover fixedly mounted on a front side of the housing, said front cover comprising a central shaft hole, a plurality of hinge pins extending perpendicularly from a front thereof and disposed at equal angles about the central shaft hole, and a plurality of gears respectively hinged to be mounted on the hinge pins; 15 a rear cover fixedly mounted on a rear side of the housing, which rear cover comprises an extension tube slid as a sleeve on the first threaded rod, and a guide piece fixed on the first tubular stem element of the telescopic stem; 20 a transmission gear set, in which the transmission gear set is provided with a plurality of gear holders, a plurality of sets of transmission gears mounted on the gear holders and engaging the longitudinal teeth of the housing, wherein a first gear holder of the gear holders of the transmission gear set 25 comprises an axis, which is pivotally coupled to the center shaft hole of the front cover, and a driven gear fixedly mounted on a distal end of the shaft and engaging with the gears of the front cover, wherein the transmission gears of a final gear holder of the gear holder of the transmission gear set engaging the gear at the first threaded rod; and a drive member that can be operated to rotate the transmission gear set, wherein the drive member comprises a circular chamber and a plurality of teeth arranged in the circular chamber and engaging with the gears of the front cover. 35

3. Bedieningsmechanisme volgens conclusie 2, waarin het transmissietandwielstel verder een voorste verlengingsbuis omvat, die zich axiaal uitstrekt vanaf het aangedreven tandwiel en door het aandrijforgaan is gestoken, en een zekeringring die is vastgemaakt aan een fixeergroef rondom de omtrek van de voorste verlengingsbuis om de voorste 5 verlengingsbuis aan het aandrijforgaan te borgen.The actuating mechanism of claim 2, wherein the transmission gear set further comprises a front extension tube axially extending from the driven gear and inserted through the drive member, and a fuse ring secured to a fixing groove around the perimeter of the front extension tube about the front extension tube 5 to secure the extension tube to the actuator.

4. Bedieningsmechanisme volgens conclusie 1, waarin de buisvormige steelelementen van de telescopische steel verschillende diameters hebben, waarin elk genoemd buisvormige steelelement een buisvormig steelelementlichaam omvat en een flens 10 die zich rondom de omtrek van één uiteinde van het buisvormige steelelementlichaam uitstrekt, waarbij de buisvormige steelelementen axiaal door elkaar heen zijn gestoken om het mogelijk te maken dat de telescopische steel afwisselend tussen een uitgetrokken stand en een ingeduwde stand wordt ingesteld.Operating mechanism according to claim 1, wherein the tubular stem elements of the telescopic stem have different diameters, wherein each said tubular stem element comprises a tubular stem element body and a flange 10 which extends around the circumference of one end of the tubular stem element body, the tubular stem elements be inserted axially through each other to allow the telescopic handle to be adjusted alternately between an extended position and a pushed-in position.

5. Bedieningsmechanisme volgens conclusie 1, waarin het vijfde buisvormige steelelement van de telescopische steel een longitudinale spleet omvat, die een longitudinale rib van de loper opneemt.The operating mechanism of claim 1, wherein the fifth tubular handle element of the telescopic handle comprises a longitudinal slit that receives a longitudinal rib of the runner.

6. Bedieningsmechanisme volgens conclusie 1, waarin de telescopische steel 20 verder een dop omvat die is vastgemaakt aan een bovenste uiteinde van het vijfde buisvormige steelelement voor het afstoppen van een bovenste uiteinde van de derde schroefstang, welke dop een bovenste schroefgat omvat, en een aan een bovenkant van het scherm vastgemaakte opsluitinrichting om het scherm op de dop en het naaf- en baleinsamenstel te houden, waarin de opsluitinrichting een van een schroefdraad voorziene 25 pen omvat die in het bovenste schroefgat van de dop wordt geschroefd. 30The operating mechanism of claim 1, wherein the telescopic handle 20 further comprises a cap fixed to an upper end of the fifth tubular handle element for plugging an upper end of the third threaded rod, which cap comprises an upper threaded hole, and an a retaining device attached to the top of the screen to hold the screen on the cap and the hub and rib assembly, wherein the retaining device comprises a threaded pin which is screwed into the upper screw hole of the cap. 30

7. Bedieningsmechanisme volgens conclusie 1, waarin het transmissiemechanisme omvat: een huis, welk huis een buisvormig orgaan is, omvattende meerdere longitudinale 5 vertandingen die zijn aangebracht rondom een binnenwand daarvan: een voorste afdekking, die vast is gemonteerd op een voorzijde van het huis; een achterste afdekking, die vast is gemonteerd op een achterzijde van het huis, 10 waarin de achterste afdekking een als huls op de eerste schroefstang geschoven verlengingsbuis omvat, en een op het eerste buisvormige steelelement van de telescopische steel vastgemaakt richtstuk; een transmissietandwielstel, welk transmissietandwielstel is voorzien van meerdere 15 tandwielhouders, waarin een veelvoud van stellen transmissietandwielen zijn aangebracht op de tandwielhouders en ineengrijpen met de longitudinale vertandingen van het huis, waarin de transmissietandwielstellen bij een laatste tandwielhouder van de tandwielhouders van het transmissietandwielstel ineengrijpen met het tandwiel bij de eerste schroefstang; en 20 een motor die is vastgemaakt aan de voorste afdekking en bediend kan worden om het transmissietandwielstel te roteren, waarin de motor een rondsel omvat dat ineengrijpt met een eerste stel transmissietandwielen van het transmissietandwielstel. 10367317. Operating mechanism as claimed in claim 1, wherein the transmission mechanism comprises: a housing, which housing is a tubular member, comprising a plurality of longitudinal teeth arranged around an inner wall thereof: a front cover fixedly mounted on a front of the housing; a rear cover fixedly mounted on a rear side of the housing, wherein the rear cover comprises an extension tube slid as a sleeve on the first threaded rod, and a guide piece secured to the first tubular stem element of the telescopic stem; a transmission gear set, which transmission gear set is provided with a plurality of gear holders, in which a plurality of sets of transmission gears are arranged on the gear holders and engage with the longitudinal teeth of the housing, wherein the transmission gear sets engage with the gear wheel at a final gear holder of the gear gear sets of the transmission gear set at the first threaded rod; and a motor attached to the front cover and operable to rotate the transmission gear set, wherein the motor comprises a pinion that engages a first set of transmission gear sets of the transmission gear set. 1036731