CN102635681A - Coaxial movable side plate double-pulley device and manufacturing method thereof - Google Patents
Coaxial movable side plate double-pulley device and manufacturing method thereof Download PDFInfo
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- CN102635681A CN102635681A CN201110038710XA CN201110038710A CN102635681A CN 102635681 A CN102635681 A CN 102635681A CN 201110038710X A CN201110038710X A CN 201110038710XA CN 201110038710 A CN201110038710 A CN 201110038710A CN 102635681 A CN102635681 A CN 102635681A
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Abstract
The invention discloses a coaxial movable side plate double-pulley device and a manufacturing method thereof. The coaxial movable side plate double-pulley device comprises a first movable side plate, a second movable side plate, a middle baffle, a connecting shaft and two pulleys, wherein the first movable side plate and the second movable side plate are oppositely arranged, the middle baffle is positioned between the first movable side plate and the second movable side plate, the connecting shaft penetrates through the middle baffle, two ends of the connecting shaft are respectively fixed on the first movable side plate and the second movable side plate, the two pulleys are respectively and rotatably arranged on the connecting shaft between the first movable side plate and the middle baffle and on the connecting shaft between the second movable side plate and the middle baffle, the first movable side plate, the second movable side plate and the middle baffle are all provided with locking holes which are corresponding to one another, and a lockset or a rope can pass through the locking holes in a fastening manner. The coaxial movable side plate double-pulley device is light in weight and high in sliding efficiency, can be fast combined with the rope, thus being convenient to operate and use, and saving time and improving the safety property in rescue activities.
Description
Technical field
The present invention relates to a kind of pulley gear, particularly a kind of coaxial double pulley device of movable side plate that is used for activities such as high-lift operation, outdoor expansion, rescue and preparation method thereof.
Background technique
Pulley gear has application widely in production and sphere of life.It can be used for changing the direction of power, or is used to utilize the less power heavier object of slinging.In addition, because the characteristics of the rolling friction between pulley and the object (rope, guide rail etc.), pulley can be used for carrying object and move apace along rope, track etc.Existing pulley gear comprises that pulley is fixed on the biside plate through axle by base plate and two supporting frames that take the shape of the letter U basically that side plate constitutes, and pulley is positioned at opening one side of supporting frame.The base plate of supporting frame is provided with hook, and when using as static pulley, hook is used for suspended in the somewhere; When using as movable pulley, hook is used for the hook object.Existing pulley gear need penetrate from an end of rope, and can not pulley be arranged on the rope from the arbitrary position of rope in use, uses very inconvenient.Particularly the rescue and the climbing field, more need with pulley apace with cable tie altogether so that race against time.This just makes existing pulley gear more impracticable.Existing pulley gear also exists quality to weigh simultaneously, pulley blocks, slides problem ineffective and the radiating effect difference easily.The heat that produces during the pulley friction can not in time distribute, and the heat of accumulation can quicken the damage of pulley, reduces the working life of pulley.
Because the defective that above-mentioned existing pulley gear exists, the inventor actively studies innovation, in the hope of founding a kind of pulley gear of new structure, makes it have more safe, practical property.
Summary of the invention
Technical problem to be solved by this invention provides the coaxial double pulley device of a kind of movable side plate; The coaxial double pulley device of this activity side plate can combine with rope apace; Thereby saved the time, and light weight, intensity are high, slip efficient is high, Safety performance is good.
In order to solve the problems of the technologies described above, the present invention has adopted following technological scheme:
The coaxial double pulley device of movable side plate; Comprise the first movable side plate and the second movable side plate, the central diaphragm between the first movable side plate and the second movable side plate, coupling shaft and two pulleys of being oppositely arranged; Said coupling shaft passes said central diaphragm; Its two ends are separately fixed on the said first movable side plate and the second movable side plate; Said two pulleys rotate on the coupling shaft that is arranged between the first movable side plate and the central diaphragm respectively and on the coupling shaft between the second movable side plate and the said central diaphragm, all offer the corresponding locking holes that is used to wear padlock tool or rope on the first movable side plate and the second movable side plate and the central diaphragm.
As preferably; Said coupling shaft is a rivet; Said two pulleys are assemblied on the said rivet through bearing; The end that said rivet has ailhead holds out against on the outer side surface of the said first movable side plate or the second movable side plate, and the other end of said rivet is riveted tightly with it after passing the said second movable side plate or the first movable side plate.
As preferably, the opposite side that said central diaphragm is provided with locking holes protrudes from the first movable side plate and the second movable side plate, and has the connection button hole.
As preferably, all have radiation hole on the said first movable side plate, the second movable side plate and the central diaphragm, the radiation hole on the first movable side plate, the second movable side plate and the central diaphragm all distributes around coupling shaft.
As preferably, the radiation hole on the said first movable side plate, the second movable side plate and the central diaphragm is 2～6, and is that the center of circle evenly distributes with said coupling shaft.
As preferably, said pulley adopts No. 6061 aluminiums to process.
As preferably, the said first movable side plate and the distance between the second movable side plate that said locking holes place is set are less than the distance between the first movable side plate that said pulley place is set and the second movable side plate.
As preferably, the width at position that the said first movable side plate and the second movable side plate at said locking holes place are set is provided with the width at the position of said pulley less than the said first movable side plate and the second movable side plate.
The present invention provides the making method of the coaxial double pulley device of a kind of movable side plate simultaneously, may further comprise the steps:
1) chooses No. 6061 aluminium of raw material, and strike out the blank of the first movable side plate, the second movable side plate and pulley respectively;
The blank of the said first movable side plate, the second movable side plate and the pulley that 2) step 1) is obtained carries out T6 heat treatment, and solid solubility temperature is 480～550 ℃, and solution time is 2～3 hours, and aging temp is 150～180 ℃, and aging time is 5～8 hours;
3) will pass through step 2) the said first movable side plate, the second movable side plate after the heat treatment and the pulley blank is cut edge respectively, punching, surface finish and anodizing, form the first movable side plate, second movable side plate and the pulley;
4) the said first movable side plate, the second movable side plate and the pulley that step 3) are obtained are assembled together through coupling shaft, pad and bearing, form the coaxial double pulley device of described movable side plate.
As preferably, the constituent of the said first movable side plate, the second movable side plate and pulley that step 3) obtains is:
Si：0.3-0.8％； Fe：0.1-0.5％； ?Cu：0.1-0.6％；
Mn：0.02-0.08％； Mg：0.8-1.5％； Zn：0.02-0.05％；
Nl：0.003-0.009％；?Cr：0.08-0.15％； Ti：0.01-0.04％；
B：0.001-0.008％； Ga：0.01-0.03％； Al：96-98％。
As preferably, the constituent of the said first movable side plate, the second movable side plate and pulley that step 3) obtains is:
Si：0.5656％； Fe：0.1763％； Cu：0.2394％；
Mn：0.0337％； Mg：0.9069％； Zn：0.0309％；
Nl：0.0056％； Cr：0.1047％； Ti：0.0165％；
B：0.0014％； Ga：0.0118％； Al：97.8892％。
Compared with prior art, beneficial effect of the present invention is:
1, the coaxial double pulley device of movable side plate of the present invention can be in the arbitrary position of rope quick mounting, pulley is combined with rope, thereby has saved the time of installing, and easy to use.
2, the coaxial double pulley device of movable side plate of the present invention has splendid slip efficient; Main force bearing point is on tiing a little; And can buckle into a plurality of fall-prevention fasteners simultaneously in the locking holes; Therefore conveniently set up the sheave block of various functions and dissimilar pulley systems, like rescue sheave block or lifting weight sheave block.
3, the coaxial double pulley device of movable side plate of the present invention can use in the high-altitude is rescued; When the indicator of trapped personnel that also has consciousness during at building or working platform; The rescue team of top can set up a sheave block that promotes the trapped person fast, upwards evacuates indicator of trapped personnel fast.
4, the coaxial double pulley device of movable side plate of the present invention promptly can be used as quiet pulley, also can be used as movable pulley.
Description of drawings
Fig. 1 is the perspective view of the coaxial double pulley device of movable side plate of the present invention.
Fig. 2 is the side view of the coaxial double pulley device of movable side plate of the present invention.
Fig. 3 rotates to the structural representation of another position for the central diaphragm of the coaxial double pulley device of movable side plate of the present invention.
Fig. 4 is the decomposition texture schematic representation of the coaxial double pulley device of movable side plate of the present invention.
Fig. 5 is the structural representation of the central diaphragm of the coaxial double pulley device of movable side plate of the present invention.
Fig. 6 is provided with the schematic representation of lockset for the coaxial double pulley device of movable side plate of the present invention.
Fig. 7 is used the user mode figure that sets up pulley system for the coaxial double pulley device of movable side plate of the present invention and other pulley gears.
Fig. 8 is the user mode figure that the coaxial double pulley device of movable side plate of the present invention uses as movable pulley.
Fig. 9 is the making flow chart of the coaxial double pulley device of movable side plate of the present invention.
Description of symbols
The coaxial double pulley device of the movable side plate of 100-
The 1-locking holes 2-first movable side plate
The 3-radiation hole 4-second movable side plate
5-rope mounting groove 6-rivet
8-pulley 9-ball bearing
10-plastic spacer 11-stainless steel gasket
12-ailhead 13-rope
14-safety button 15-central diaphragm
16-connects button hole
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail, but not as to qualification of the present invention.
Fig. 1 is the perspective view of the coaxial double pulley device of movable side plate of the present invention.Fig. 2 is the side view of the coaxial double pulley device of movable side plate of the present invention.Fig. 3 rotates to the structural representation of another position for the central diaphragm of the coaxial double pulley device of movable side plate of the present invention.Fig. 4 is the decomposition texture schematic representation of the coaxial double pulley device of movable side plate of the present invention.Extremely shown in Figure 4 like Fig. 1; The coaxial double pulley device of movable side plate; Comprise the first movable side plate 2 that is oppositely arranged and the second movable side plate 4 (structure of first side plate 2 and second side plate 4 is identical), central diaphragm 15, coupling shaft and two pulleys 8 between the first movable side plate 2 and the second movable side plate 4; Said coupling shaft passes central diaphragm 15, and its two ends are separately fixed on the first movable side plate 2 and the second movable side plate 4, and central diaphragm 15 can rotate around coupling shaft.Two pulleys 8 rotate on the coupling shaft that is arranged between the first movable side plate 2 and the central diaphragm 15 respectively and on the coupling shaft between the second movable side plate 4 and the central diaphragm 15, all offer the corresponding locking holes 1 that is used to wear padlock tool or rope on the first movable side plate 2 and the second movable side plate 4 and the central diaphragm 15.
In the present embodiment; As a kind of preferred version; Said coupling shaft is a rivet 6, and each pulley 8 is assemblied on the rivet 6 through a ball bearing 9 respectively, and two ball bearings 9 are provided with plastic spacer 10 respectively respectively and between the first movable side plate 2 and the second movable side plate 4.The end that rivet 6 has ailhead 12 holds out against on first movable side plate 2 outer side surfaces, between the ailhead 12 and the first movable side plate 2 stainless steel gasket 11 is set, and the other end of rivet 6 passes and stainless steel gasket 11 is set and punching press is riveted tightly behind the second movable side plate 4 above that.Fig. 5 is the structural representation of the central diaphragm of the coaxial double pulley device of movable side plate of the present invention.As another preferred version of present embodiment, as shown in Figure 5, the opposite side that central diaphragm 7 is provided with locking holes 1 protrudes from the first movable side plate 2 and the second movable side plate 4, and has connection button hole 16.As shown in Figure 3, central diaphragm 15 is approximate ellipticity.Connect button hole 16 and can be used for wearing padlock tool, bandlet or safety and buckle etc., further improve the safe, practical property of the coaxial double pulley device of movable side plate of the present invention.
Another preferred version as present embodiment; For the coaxial double pulley device of movable side plate is in use distributed rapidly because of the heat that friction produces; Thereby improve its usability; Prolong its working life, effectively reduce the weight of the first movable side plate 2 and the second movable side plate 4 simultaneously.Have a plurality of radiation holes 3 on the first movable side plate 2 and the second movable side plate 4, in the present embodiment, radiation hole 3 is three, and three radiation holes 3 are that the center of circle evenly distributes with rivet 6.Locking holes 1 extend to rivet 6 near, play the effect of heat radiation simultaneously.
In order to improve the intensity and the wear resistance of the coaxial double pulley device of movable side plate, two pulleys 8 all adopt No. 6061 aluminium manufacturings.And the spacing of the first movable side plate 2 and the second movable side plate 4 that said locking holes 1 place is set is less than the spacing that pulley 8 places are set.That is to say that the first movable side plate 2 and the second movable side plate 4 are provided with the position of locking holes 1 and are provided with between the position of pulley 8 has inside kink.Be provided with like this first movable side plate 2 and the second movable side plate 4 are locked together in together with being more prone to, near the pulley 8 between the first movable side plate 2 and the second movable side plate 4, be formed for rope mounting groove 5 ccontaining and that rope is passed simultaneously.The width at the position that locking holes 1 is set of the first movable side plate 2 is less than the width at the position that pulley 8 is set; The width at the position that locking holes 1 is set of the second movable side plate 4 is less than the width at the position that pulley 8 is set.Be provided with like this and can save material.The first movable side plate 2 and the second movable side plate 4 are symplex structure.
Fig. 6 is provided with the schematic representation of lockset for the coaxial double pulley device of movable side plate of the present invention.As shown in Figure 6; The coaxial double pulley device of movable side plate of the present invention can be arranged on wire rope or the rope etc. from any position between the first movable side plate 2 and central diaphragm 15 and the second movable side plate 4 and the central diaphragm 15; Pass locking holes 1 corresponding on first movable side plate 2, the second movable side plate 4 and the central diaphragm 15 with lockset, band button or safety button 14 etc. then, thereby the coaxial double pulley device of movable side plate of the present invention is combined with track rapidly.In addition, pull for ease, lockset, band button or safety button 14 etc. also can be set in the connection button hole 16 on the central diaphragm 15.Can slide fast along rope through corresponding objects of connection such as lockset, band button or safety buttons 14.
Fig. 7 is used the user mode figure that sets up pulley system for the coaxial double pulley device of movable side plate of the present invention and other pulley gears.As shown in Figure 7; The coaxial double pulley device 100 of movable side plate of the present invention adopts large diameter No. 6061 aluminiums to make pulley 8; And cooperation ball bearing 9; Have high slip efficient, main stressed on tiing a little, make the coaxial double pulley device 100 of movable side plate of the present invention can set up dissimilar pulley systems.
Fig. 8 is the user mode figure of the coaxial double pulley device of movable side plate of the present invention as the movable pulley function.As shown in Figure 8, when the indicator of trapped personnel that also has consciousness on building or during working platform, the rescue team of top can set up a sheave block that promotes the trapped person fast, upwards evacuates indicator of trapped personnel fast.The coaxial double pulley device 100 of movable side plate as can be seen from the figure of the present invention can use separately, or uses with other pulley combinations, has application fields.Fig. 9 is the making flow chart of the coaxial double pulley device of movable side plate of the present invention.As shown in Figure 9, the making method of the coaxial double pulley device 100 of movable side plate comprises the steps:
1, chooses No. 6061 aluminium of raw material, and strike out the blank of first movable side plate 2, the second movable side plate 4 and pulley 8 respectively;
2, to carrying out T6 heat treatment through first movable side plate 2, the second movable side plate 4 of step 1 acquisition and the blank of pulley 8, solid solubility temperature is 480～550 ℃, is preferably 530 ℃; Solution time is 2～3 hours, is preferably 2 hours; Aging temp is 150～180 ℃, is preferably 180 ℃; Aging time is 5～8 hours; Be preferably 8 hours;
The blank that 3, will pass through first movable side plate 2, the second movable side plate 4 and pulley 8 after step 2 heat treatment is cut edge respectively, punching, surface finish and anodizing, forms first movable side plate 2, second movable side plate 4 and the pulley 8;
4, first movable side plate 2, the second movable side plate 4 and the pulley 8 that step 3 are obtained are assembled together through rivet 6, plastic spacer 10, stainless steel gasket 11 and ball bearing 9, promptly form the coaxial double pulley device 100 of movable side plate of the present invention.
The present invention carries out T6 heat treatment to first movable side plate 2, the second movable side plate 4 and pulley 8; Improved the defective of the die castings internal loose that other heat treatment modes of available technology adopting exist, the stability that pore and aeration die castings internal structure are arranged etc., made the internal structure of of the present invention first movable side plate 2, the second movable side plate 4 and pulley 8 more stable.T6 heat treatment is a kind of heat treatment process of wrought aluminium alloy (being different from cast aluminium alloy); It is the process of " solution treatment (being called " quenching ")+artificial aging " for this process of iron and steel; Wherein principal element is solid solubility temperature, solution time, aging temp, constant temperature time.The T6 heat treatment process is to solve intensity, the plasticity reasonably combined (high intensity and enough plasticity) of material and the key of corrosion resistance.
First movable side plate 2, the second movable side plate 4 that step 3 obtains and the constituent of pulley 8 are:
Si：0.3-0.8％； Fe：0.1-0.5％； Cu：0.1-0.6％；
Mn：0.02-0.08％； Mg：0.8-1.5％； Zn：0.02-0.05％；
Nl：0.003-0.009％； Cr：0.08-0.15％； Ti：0.01-0.04％；
B：0.001-0.008％； Ga：0.01-0.03％； Al：96-98％。
Preferred as further, first movable side plate 2, the second movable side plate 4 that step 3 obtains and the constituent of pulley 8 are:
Si：0.5656％； Fe：0.1763％； Cu：0.2394％；
Mn：0.0337％； Mg：0.9069％； Zn：0.0309％；
Nl：0.0056％； Cr：0.1047％； Ti：0.0165％；
B：0.0014％； Ga：0.0118％； Al：97.8892％。
Anodic oxidation in the said method of the present invention can form the aluminium oxide thin layer on the surface of first movable side plate 2, the second movable side plate 4 and pulley 8, its thickness is 5～20 microns, and horniness anode oxide film can reach 60～200 microns.Its hardness and wear resistance have been improved; Can reach 250～500 kilograms/square millimeter, good heat resistance, the horniness anode oxide film fusing point is up to 2320 ℃; Good insulating properties; Breakdown voltage resistant up to 2000V, strengthened corrosion resistance, in ω=0.03NaCl salt fog, do not corrode in thousand hours through 3000-4000.
Claims (10)
1. the coaxial double pulley device of movable side plate; It is characterized in that; Comprise the first movable side plate and the second movable side plate, the central diaphragm between the first movable side plate and the second movable side plate, coupling shaft and two pulleys of being oppositely arranged; Said coupling shaft passes said central diaphragm; Its two ends are separately fixed on the said first movable side plate and the second movable side plate, and said two pulleys rotate on the coupling shaft that is arranged between the first movable side plate and the central diaphragm respectively and on the coupling shaft between the second movable side plate and the said central diaphragm, all offer the corresponding locking holes that is used to wear padlock tool or rope on the first movable side plate and the second movable side plate and the central diaphragm.
2. the coaxial double pulley device of movable side plate according to claim 1; It is characterized in that; Said coupling shaft is a rivet; Said two pulleys are assemblied on the said rivet through bearing, and the end that said rivet has ailhead holds out against on the outer side surface of the said first movable side plate or the second movable side plate, and the other end of said rivet is riveted tightly with it after passing the said second movable side plate or the first movable side plate.
3. the coaxial double pulley device of movable side plate according to claim 1 is characterized in that, the opposite side that said central diaphragm is provided with locking holes protrudes from the first movable side plate and the second movable side plate, and has the connection button hole.
4. according to the coaxial double pulley device of each described movable side plate in the claim 1 to 3; It is characterized in that; All have radiation hole on the said first movable side plate, the second movable side plate and the central diaphragm, the radiation hole on the first movable side plate, the second movable side plate and the central diaphragm all distributes around coupling shaft.
5. the coaxial double pulley device of movable side plate according to claim 4 is characterized in that, the radiation hole on the said first movable side plate, the second movable side plate and the central diaphragm is 2～6, and is that the center of circle evenly distributes with said coupling shaft.
6. according to the coaxial double pulley device of each described movable side plate in the claim 1 to 3, it is characterized in that said pulley adopts No. 6061 aluminiums to process.
7. according to the coaxial double pulley device of each described movable side plate in the claim 1 to 3; It is characterized in that the said first movable side plate and the distance between the second movable side plate that said locking holes place is set are less than the distance between the first movable side plate that said pulley place is set and the second movable side plate.
8. according to the coaxial double pulley device of each described movable side plate in the claim 1 to 3; It is characterized in that the width at position that the said first movable side plate and the second movable side plate at said locking holes place are set is provided with the width at the position of said pulley less than the said first movable side plate and the second movable side plate.
9. the making method of the coaxial double pulley device of each described movable side plate in the claim 1 to 8 is characterized in that, comprises the steps:
1) chooses No. 6061 aluminium of raw material, and strike out the blank of the first movable side plate, the second movable side plate and pulley respectively;
The blank of the said first movable side plate, the second movable side plate and the pulley that 2) step 1) is obtained carries out T6 heat treatment, and solid solubility temperature is 480～550 ℃, and solution time is 2～3 hours, and aging temp is 150～180 ℃, and aging time is 5～8 hours;
3) will pass through step 2) the said first movable side plate, the second movable side plate after the heat treatment and the pulley blank is cut edge respectively, punching, surface finish and anodizing, form the first movable side plate, second movable side plate and the pulley;
4) the said first movable side plate, the second movable side plate and the pulley that step 3) are obtained are assembled together through coupling shaft, pad and bearing, form the coaxial double pulley device of described movable side plate.
10. the making method of the coaxial double pulley device of the described movable side plate of claim 9 is characterized in that, the constituent of the said first movable side plate, the second movable side plate and pulley that step 3) obtains is:
Si：0.3-0.8％
Fe：0.1-0.5％
Cu：0.1-0.6％
Mn：0.02-0.08％
Mg：0.8-1.5％
Zn：0.02-0.05％
Nl：0.003-0.009％
Cr：0.08-0.15％
Ti：0.01-0.04％
B：0.001-0.008％
Ga：0.01-0.03％
Al：96-98％。
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| CN201110038710XA CN102635681A (en) | 2011-02-15 | 2011-02-15 | Coaxial movable side plate double-pulley device and manufacturing method thereof |
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| CN201110038710XA CN102635681A (en) | 2011-02-15 | 2011-02-15 | Coaxial movable side plate double-pulley device and manufacturing method thereof |
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| CN102635681A true CN102635681A (en) | 2012-08-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI652422B (en) | 2013-12-27 | 2019-03-01 | 法商熱德公司 | Improved pulley device |
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| GB918785A (en) * | 1959-09-29 | 1963-02-20 | Wilfred Charles Julian Halford | Improvements in or relating to block and tackle apparatus |
| US5927438A (en) * | 1996-09-30 | 1999-07-27 | Ostrobrod; Meyer | Personnel lifting-lowering system |
| US6189867B1 (en) * | 1998-10-23 | 2001-02-20 | Surety Manufacturing & Testing Ltd. | Load-handling device |
| US20060091369A1 (en) * | 2004-10-29 | 2006-05-04 | Thompson Rocke P | Snatch block, snatch block assembly and method of use |
| CN201982620U (en) * | 2011-02-15 | 2011-09-21 | 刘文辉 | Coaxial double-pulley device with movable side plates |
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2011
- 2011-02-15 CN CN201110038710XA patent/CN102635681A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB918785A (en) * | 1959-09-29 | 1963-02-20 | Wilfred Charles Julian Halford | Improvements in or relating to block and tackle apparatus |
| US5927438A (en) * | 1996-09-30 | 1999-07-27 | Ostrobrod; Meyer | Personnel lifting-lowering system |
| US6189867B1 (en) * | 1998-10-23 | 2001-02-20 | Surety Manufacturing & Testing Ltd. | Load-handling device |
| US20060091369A1 (en) * | 2004-10-29 | 2006-05-04 | Thompson Rocke P | Snatch block, snatch block assembly and method of use |
| CN201982620U (en) * | 2011-02-15 | 2011-09-21 | 刘文辉 | Coaxial double-pulley device with movable side plates |
Non-Patent Citations (2)
| Title |
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| 中华人民共和国国家发展和改革委员会: "《中华人民共和国有色金属行业标准》", 25 May 2006 * |
| 中华人民共和国国家质量监督检验检疫总局: "《变形铝及铝合金化学成分》", 17 June 2008 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI652422B (en) | 2013-12-27 | 2019-03-01 | 法商熱德公司 | Improved pulley device |
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Application publication date: 20120815 |