CN101672336B - Deceleration mechanism - Google Patents
Deceleration mechanism Download PDFInfo
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- CN101672336B CN101672336B CN 200810213483 CN200810213483A CN101672336B CN 101672336 B CN101672336 B CN 101672336B CN 200810213483 CN200810213483 CN 200810213483 CN 200810213483 A CN200810213483 A CN 200810213483A CN 101672336 B CN101672336 B CN 101672336B
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- Prior art keywords
- slide block
- shell
- reducing gear
- section
- friction
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Abstract
The invention discloses a deceleration mechanism, which is applicable to a retractable screen. The deceleration mechanism comprises a shell, a mandrel, a friction blade and a reciprocating slide block. The shell is provided with a bearing hole and a guide screw thread. The mandrel is provided with a pivoting section, a mounting section and a sliding section. The pivoting section is inserted into the bearing hole. The mounting section is positioned in the shell. The friction blade is pivoted to the mounting section. The reciprocating slide block is glidingly arranged on the sliding section, and is provided with a guide protrusion. When the shell rotates relative to the mandrel along the first clock direction, the guide protrusion rounds along the guide screw thread so that the reciprocating slide block slides towards the friction blade to increase the friction force between the friction blade and the inner surface of the shell. When the shell rotates relative to the mandrel along the second clock direction opposite to the first clock direction, the guide protrusion rounds along the guide screw thread so that the reciprocating slide block is far away from the friction blade to reduce the friction force between the friction blade and the inner surface of the shell.
Description
[technical field]
The invention relates to a kind of reducing gear, particularly about a kind of reducing gear of retracting type screen.
[background technique]
Projecting apparatus can cooperate a projection screen as its image projection target usually.The common type of projection screen is the retracting type screen, because of it has the property of furling, thereby has increased the convenience of projecting apparatus on using.With regard to the retracting type screen, in order to make screen after winding device is drop-down, when needing to reclaim screen, avoid excessive because of the response force of winding device spring, cause screen moment impact winding device shell and cause damage.Therefore, usually a reducing gear can be set on the winding device, return back to speed in the winding device shell to slow down screen.
Existing a kind of reducing gear that is arranged at the retracting type screen has adopted complicated structure.This kind reducing gear comprises clutch structure, drive mechanism and brake structure, and wherein drive mechanism is constituted with planetary gear set.When power when planetary gear set is passed to brake structure, brake structure can produce centrifugal friction by high speed rotating, to reach the purpose of deceleration.Therefore, screen just can furl to winding device lentamente.Yet, the complex structure of this kind reducing gear, and the environment that need seal during transmission, and need often to add lubricant oil to be lubricated, safeguard with use all inconvenient.
[summary of the invention]
The present invention proposes a kind of reducing gear that is applicable to the retracting type screen, can simplify its preparation process and reduce fabricating cost.
The present invention proposes a kind of reducing gear, is applicable to a retracting type screen.Reducing gear comprises a shell, a mandrel, at least one friction blade and a reciprocal slide block.Shell has a bearing hole and a guiding threads.Mandrel has a pivot section, a construction section and a glissile segment, and the section that wherein pivots wears to bearing hole, and construction section is positioned at shell.The friction blade is arranged at construction section pivotly.Back and forth slide block is slidably disposed on glissile segment, and has a guide projections.Wherein when shell with respect to mandrel when one first clockwise rotates, guide projections detours along guiding threads, makes reciprocal slide block slide towards the friction blade, in order to the frictional force between the inner face that increases friction blade and shell.When shell with respect to mandrel along one during in contrast to the rotation of first conterclockwise second clockwise, guide projections detours along guiding threads and makes reciprocal slide block slide away from the friction blade, in order to the frictional force between the inner face of reduce friction blade and shell.
Reducing gear of the present invention, the shell of above-mentioned reducing gear comprise a bearing section, a guiding section and a closed section.The bearing section has bearing hole.Guiding section locks to the bearing section, and has guiding threads.Closed section locks to guiding section.
Reducing gear of the present invention, above-mentioned shell rotates around one first spin axis with respect to mandrel, and back and forth slide block slides along first spin axis with respect to glissile segment.
Reducing gear of the present invention, above-mentioned friction blade is parallel in fact but do not coincide with second spin axis rotation of first spin axis along one.Moreover an end of friction blade is arranged to construction section pivotly, and its other end inner face of contact shell.
Reducing gear of the present invention, above-mentioned reciprocal slide block has a conical surface, when reciprocal slide block towards the friction blade when axially sliding with respect to glissile segment, the conical surface with respect to glissile segment radially the application of force to the blade that rubs.On the other hand, back and forth slide block has at least one buffer substrate tablet, and the one end is fixedly arranged on an end of reciprocal slide block, buffer substrate tablet and extend to the conical surface with the friction blade between, be applied on the reciprocal slide block radial component in order to the buffering blade that rubs with respect to mandrel.Back and forth slide block has more a restraining groove, and glissile segment has a position limit pin, and it extends in the restraining groove, in order to define the sliding scale of reciprocal slide block with respect to glissile segment.
Reducing gear of the present invention, above-mentioned reducing gear more comprises an elastomer, for example is a helical spring, it is equipped between reciprocal slide block and the shell, moves towards guiding threads in order to order about guide projections.
The above embodiment of the present invention is because of adopting the reducing gear of friction type, therefore can adopt planetary simplified of reducing gear with having now, the deceleration effect that the gear train that making needs a plurality of complexity originally just can reach, can finish easily after replacing with a plurality of friction blades, thus so that manufacture cost is oversimplified and effectively reduced to manufacturing process.On the other hand, be difficult for compared to planetary gear set dismounting and replacing, the friction blade that the above embodiment of the present invention adopted provides the retracting type screen to go up many conveniences in maintenance because of simple in structure and easy processing.Therefore, the above embodiment of the present invention is in making and use the shortcoming of all having improved existing reducing gear.
For above-mentioned feature and advantage of the present invention can be become apparent, an embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
[description of drawings]
Figure 1A is the schematic representation of a kind of reducing gear of one embodiment of the invention.
Figure 1B is the explosive view of the reducing gear of Figure 1A.
Fig. 2 A is the generalized section of reducing gear when rolling up screen of Figure 1B.
Fig. 2 B is the part schematic representation of the reducing gear of Fig. 2 A.
Fig. 2 C is the side view of the reducing gear of Fig. 2 B.
Fig. 3 A is the generalized section of reducing gear when drill-down screens of Figure 1B.
Fig. 3 B is the part schematic representation of the reducing gear of Fig. 3 A
Fig. 3 C is the side view of the reducing gear of Fig. 3 B.
100: reducing gear 130: the friction blade
110: shell 140: reciprocal slide block
112: bearing section 142: guide projections
112a: bearing hole 144: buffer substrate tablet
114: guiding section 146: restraining groove
114a: guiding threads 150: elastomer
116: closed section C: the conical surface
120: mandrel Fr: radial force
122: the section that pivots F: first clockwise
124: construction section R: second clockwise
126: glissile segment S: first spin axis
126a: position limit pin T: second spin axis
126b: lock part
[embodiment]
Following each embodiment's explanation is graphic with reference to what add, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to annexed drawings.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
Figure 1A is the schematic representation of a kind of reducing gear of one embodiment of the invention.Figure 1B is the explosive view of the reducing gear of Figure 1A.Please refer to Figure 1A and Figure 1B, present embodiment discloses a kind of reducing gear 100 that is applicable to the retracting type screen, and it comprises a shell 110, a mandrel 120, at least one friction blade 130 and a reciprocal slide block 140.The quantity of at least one friction blade can be a plurality of, and look its required frictional force size and determine that in present embodiment, the quantity of at least one friction blade 130 is three, but not as limit.
Fig. 2 A is the generalized section of reducing gear when rolling up screen of Figure 1B, and Fig. 2 B is the part schematic representation of the reducing gear of Fig. 2 A, and Fig. 2 C is the side view of the reducing gear of Fig. 2 B.Can know and understand reducing gear 100 when the rolling up screen for asking, friction blade 130, the reciprocal situation of slide block 140 and the mutual start of bearing section 112 inner faces, so Fig. 2 B and Fig. 2 C display unit part.Please also refer to Fig. 2 A, Fig. 2 B and 2C, when the retracting type screen furls, shell 110 with respect to mandrel 120 around one first spin axis S, and rotate along one first clockwise F, this moment, guide projections 142 just can detour along guiding threads 114a, so that back and forth slide block 140 slides along the first spin axis S and towards friction blade 130 with respect to bearing hole 112a.
It should be noted that, one end of friction blade 130 is arranged at construction section 124 pivotly, and when reciprocal slide block 140 when friction blade 130 slides, a conical surface C who is positioned at reciprocal slide block 140 front ends can provide the radial force Fr with respect to glissile segment 126 to put on the friction blade 130, therefore the blade 130 that rubs can make its other end contact and produce friction with the inner face of shell 110 along one parallel in fact but do not coincide with the second spin axis T rotation of the first spin axis S.The increase of frictional force can reduce the rotating speed of shell 110 with respect to mandrel 120, and then slows down the speed that furls of retracting type screen.
In the present embodiment, back and forth slide block 140 more comprises at least one buffer substrate tablet 144, the one end is fixedly arranged on an end of reciprocal slide block 140, buffer substrate tablet 144 and extend to conical surface C and the friction blade 130 between, the material of its available rubber-like steel or other abrasion performances is made, be applied on the reciprocal slide block 140 with respect to the radial component Fr of mandrel 120 in order to buffering friction blade 130, make reciprocal slide block 140 avoid directly contacting and cause bearing radial component Fr and impaired with the blade 130 that rubs.
Refer again to Figure 1B, in the present embodiment, back and forth slide block 140 also has a restraining groove 146, then has a position limit pin 126a on the opposite position of glissile segment 126, and it extends in the restraining groove 146.Therefore, by cooperating of restraining groove 146 and position limit pin 126a, reciprocal slide block 140 can be locked part 126b with one and be defined on the glissile segment 126, reciprocal slide block 140 only is defined can be moved and can not rotate along the first spin axis S.Moreover, can be by the length of the restraining groove 146 and the first spin axis S parallel direction, limit the sliding scale of reciprocal slide block 140,, can control the frictional force scope of the inner face of friction blade 130 and shell 110 indirectly to control the stroke of reciprocal slide block 140 with respect to glissile segment 126.
Fig. 3 A is the generalized section of reducing gear when drill-down screens of Figure 1B, and Fig. 3 B is the part schematic representation of the reducing gear of Fig. 3 A, and Fig. 3 C is the side view of the reducing gear of Fig. 3 B.Can know and understand reducing gear 100 when the drill-down screens for asking, friction blade 130, the reciprocal situation of slide block 140 and the mutual start of bearing section 112 inner faces, so Fig. 3 B and Fig. 3 C display unit part.Please also refer to Fig. 3 A, Fig. 3 B and Fig. 3 C, when screen is drop-down, shell 110 with respect to mandrel 120 around the first spin axis S, but along the one second clockwise R rotation opposite with the first clockwise F, make guide projections 142 oppositely detour along guiding threads 114a, so as to reciprocal slide block 140 is slided along the first spin axis S and away from friction blade 130 with respect to bearing hole 112a, consequently withdraw from guiding threads 114a.Therefore, the contacting of the inner face of friction blade 130 removals and shell 110, the frictional force minimizing, screen is able to drop-down smooth-goingly.
Behind the drop-down segment distance of screen, the guide projections 142 of reducing gear 100 withdraws from guiding threads 114a fully.At this moment, when avoiding screen to furl once more, dislocation takes place with guiding threads 114a and causes reducing gear 100 to lose efficacy in guide projections 142.Therefore, in the present embodiment, reducing gear 100 also comprises an elastomer 150, it for example is a helical spring, it is equipped between reciprocal slide block 140 and the closed section 116, and wherein an end of elastomer 150 is embedded at reciprocal slide block 140, and the other end then is embedded at closed section 116.When reciprocal slide block 140 withdrawed from guiding threads 114a, elastomer 150 provided the elastic force opposite with exit axis, moved and contraposition towards guiding threads 114a so as to ordering about guide projections 142.
In sum, the reducing gear of the above embodiment of the present invention has replaced the mode of slowing down with the planetary gear set of complexity in the prior art in the mode that reciprocal slide block promotes the friction blade, thereby originally complexity and the higher manufacture process of difficulty have been simplified, wherein rub blade and other correlated parts because of simple structure be easy to processing, so making assembling or using in the maintenance, its degree of difficulty reduces many compared to the reducing gear that adopts planetary gear set.
On the other hand, the reducing gear with planetary gear set has fixing gear ratio, and the frictional force in the time of can't furling at screen is adjusted.Yet, the reducing gear of the above embodiment of the present invention owing to take the directly stressed mode of contact of blade that rubs, so needed buffering strength can furl according to screen the time, corresponding friction blade or the back and forth relevant position and the stroke of slide block adjusted.
Moreover, be different from the reducing gear that adopts planetary gear set and belong to the wet type structure, need be lubricated to avoid planetary gear set impaired with oiling agent in its start process, the reducing gear of the above embodiment of the present invention then is to belong to dry construction, except not needing the oiling agent, in when maintenance thereby can carry out dismounting and part exchanging easily, it is lower to add friction blade manufacture cost, with respect to the higher maintenance expenses of changing planetary gear set, the reducing gear of the above embodiment of the present invention has more the competitive ability on the market.
Though the present invention discloses as above with an embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (9)
1. a reducing gear is applicable to a retracting type screen, and this reducing gear comprises:
One shell has a bearing hole and a guiding threads;
One mandrel has a pivot section, a construction section and a glissile segment, and wherein this pivot section wears to this bearing hole, and this construction section is positioned at this shell;
At least one friction blade, an end of this friction blade is arranged at this construction section pivotly, and the other end of this friction blade is used for contacting the inner face of this shell; And
One reciprocal slide block is slidably disposed on this glissile segment, and has a guide projections, and this reciprocal slide block has a conical surface,
Wherein, when this shell with respect to this mandrel when one first clockwise rotates, this guide projections detours along this guiding threads, make that this reciprocal slide block axially slides with respect to this glissile segment towards this friction blade, this conical surface with respect to this glissile segment radially the application of force to this blade that rubs, in order to the frictional force between the inner face that increases this friction blade and this shell
When this shell with respect to this mandrel along one during in contrast to this first conterclockwise second clockwise rotation, this guide projections detours along this guiding threads, make this reciprocal slide block slide, in order to the frictional force between the inner face that reduces this friction blade and this shell away from this friction blade.
2. reducing gear as claimed in claim 1 is characterized in that: this shell comprises:
One bearing section has this bearing hole;
One guiding section locks to this bearing section, and has this guiding threads; And
One closed section locks to this guiding section.
3. reducing gear as claimed in claim 1 is characterized in that: this shell rotates around one first spin axis with respect to this mandrel, and this reciprocal slide block slides along this first spin axis with respect to this glissile segment.
4. reducing gear as claimed in claim 3 is characterized in that: this friction blade rotates along parallel in fact but second spin axis that do not coincide with this first spin axis.
5. reducing gear as claimed in claim 1, it is characterized in that: this reciprocal slide block has at least one buffer substrate tablet, the one end is fixedly arranged on an end of this reciprocal slide block, this buffer substrate tablet and extend to this conical surface and this friction blade between, be applied on this reciprocal slide block radial component in order to cushion this friction blade with respect to this mandrel.
6. reducing gear as claimed in claim 1 is characterized in that: this reciprocal slide block has a restraining groove, and this glissile segment has a position limit pin, and this position limit pin extends in this restraining groove, in order to define the sliding scale of this reciprocal slide block with respect to this glissile segment.
7. reducing gear as claimed in claim 1 is characterized in that: also comprise:
One elastomer is equipped between this reciprocal slide block and this shell, moves towards this guiding threads in order to order about this guide projections.
8. reducing gear as claimed in claim 7 is characterized in that: this elastomer comprises a helical spring.
9. reducing gear as claimed in claim 1 is characterized in that: the quantity of this at least one friction blade is three friction blades, and these friction blades are pivotally installed in this construction section respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810213483 CN101672336B (en) | 2008-09-08 | 2008-09-08 | Deceleration mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810213483 CN101672336B (en) | 2008-09-08 | 2008-09-08 | Deceleration mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101672336A CN101672336A (en) | 2010-03-17 |
| CN101672336B true CN101672336B (en) | 2011-12-14 |
Family
ID=42019689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810213483 Expired - Fee Related CN101672336B (en) | 2008-09-08 | 2008-09-08 | Deceleration mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101672336B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109292580B (en) * | 2018-11-21 | 2024-05-10 | 广州广日电梯工业有限公司 | Wind-pressure type adjustable speed limiter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513805A (en) * | 1982-04-30 | 1985-04-30 | Toso Kabushiki Kaisha | Decelerator for use in roller blinds |
| CN2720483Y (en) * | 2004-08-13 | 2005-08-24 | 广州美视晶莹银幕有限公司 | Projection screen speed-reducing mechanism |
-
2008
- 2008-09-08 CN CN 200810213483 patent/CN101672336B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513805A (en) * | 1982-04-30 | 1985-04-30 | Toso Kabushiki Kaisha | Decelerator for use in roller blinds |
| CN2720483Y (en) * | 2004-08-13 | 2005-08-24 | 广州美视晶莹银幕有限公司 | Projection screen speed-reducing mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101672336A (en) | 2010-03-17 |
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