CN204021281U - A kind of draw off gear of chain - Google Patents
A kind of draw off gear of chain Download PDFInfo
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- CN204021281U CN204021281U CN201420340670.3U CN201420340670U CN204021281U CN 204021281 U CN204021281 U CN 204021281U CN 201420340670 U CN201420340670 U CN 201420340670U CN 204021281 U CN204021281 U CN 204021281U
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Abstract
The utility model provides a kind of draw off gear of chain, belongs to field of mechanical technique.Unsafe problem while unclamping chain that it has solved existing hand chain strainer.The draw off gear of this comprises that an inside is the housing of cavity, in housing, be provided with a rotating shaft, rotating shaft one end is fixed with sprocket wheel, on sprocket wheel, be wound with chain, these chain two ends are all stretched out housing and in wherein one end of chain, are fixed with hook one, in housing, be also axially fixed with worm screw, worm screw outer end is stretched out housing and is connected with one handle, the rotating shaft other end is fixed with ratchet, in rotating shaft, be arranged with worm gear and this worm gear and worm mesh, this sidepiece that is positioned at ratchet on worm gear is hinged with ratchet, between ratchet and worm gear, be provided with the elastic component that makes ratchet be embedded into the ratchet trend of ratchet, ratchet place is also provided with a shifting part, by external force, stir the ratchet that this shifting part can make ratchet overcome the elastic force of elastic component and depart from ratchet.That the draw off gear of this chain has is simple in structure, chain unclamps the advantages such as safety.
Description
Technical field
The utility model belongs to field of mechanical technique, relates to a kind of draw off gear of chain.
Background technology
In logistics operation, need Goods binding, prevent that the goods betransporteding from causing cargo damage or loss with jolt, vibrations etc. in transportation.Chain tensioner is exactly so a kind of instrument for restraint of loads.
As the driver train [application number: 201220367023.2 of a kind of hand chain strainer proposing before applicant; Granted publication number: CN202783850U], comprise that inner is the housing of cavity, in housing, there is the sprocket wheel that can rotate and be wound around for chain, this driver train comprises rotation handgrip, worm screw, worm gear and guide, rotating handgrip is axially fixed on housing, worm gear and sprocket wheel are connected, and worm screw is circumferentially fixed with rotating handgrip, and when worm screw departs from or meshes with worm gear, guide is all embedded on the wrom tooth of worm screw.
In the driver train of this hand chain strainer, when turbine and worm screw disengaging, can realize and manually pull fast chain to carry out chain pretension, then rotate handgrip chain is further strained; When needs unclamp chain, by reversion handgrip, worm and wheel is departed from.Because worm and worm wheel in the driver train of this hand chain strainer are mesh under the effect of guide or depart from, and can there is not sway in guide.The stroke that drives worm and wheel to depart from when handle reversion is changeless.With time by this hand chain strainer upper and lower two hook fixedly come goods to strain, the further tensioning chain of turning handle again after manual tensioning chain, and in this course, chain fixed end produces a power of pointing to housing, and this power slowly becomes large in the process of tensioning chain; When needs unclamp chain, reversion handle departs from worm and wheel, and the power of sensing housing is slow consumption in this course, but because the stroke of worm and worm wheel is changeless, when worm and wheel departs from completely, the power of pointing to housing may not be consumed, and now chain fixed end can rush building or have the trend of rushing building to housing direction to housing direction, has larger potential safety hazard.
Summary of the invention
The purpose of this utility model is to have the problems referred to above for existing technology, has proposed the draw off gear of the chain that a kind of chain can decontrol safely.
The purpose of this utility model can realize by following technical proposal: a kind of draw off gear of chain, comprise that an inside is the housing of cavity, in described housing, be provided with a rotating shaft, described rotating shaft one end is fixed with sprocket wheel, on described sprocket wheel, be wound with chain, these chain two ends are all stretched out housing and in wherein one end of chain, are fixed with hook one, in described housing, be also axially fixed with worm screw, described worm screw outer end is stretched out housing and is connected with one handle, it is characterized in that, the described rotating shaft other end is fixed with ratchet, in described rotating shaft, be arranged with worm gear and this worm gear and worm mesh, this sidepiece that is positioned at above-mentioned ratchet on described worm gear is hinged with ratchet, between described ratchet and worm gear, be provided with the elastic component that makes above-mentioned ratchet be embedded into the ratchet trend of ratchet, described ratchet place is also provided with a shifting part, by external force, stir the ratchet that this shifting part can make ratchet overcome the elastic force of above-mentioned elastic component and depart from ratchet.
When the draw off gear of this chain is used, first by pulling down one end of not linking up with one in chain, chain-driving sprocket rotation, because ratchet and rotating shaft are connected, therefore sprocket wheel drives ratchet realization to clockwise rotate by rotating shaft, the ratchet of ratchet is resisted against on ratchet and thereby the elastic force that overcomes elastic component makes ratchet rotate and be separated with ratchet around hinge-point, and chain is strained, after manually cannot tensioning chain, due to elastic component act under ratchet have in the ratchet that is embedded into ratchet, prevent that ratchet from taking a turn for the worse, now turning handle drives worm screw and worm gear is clockwise rotated, being fixed in the ratchet that ratchet on worm gear is pressed into ratchet and being meshed with it drives ratchet one-way to rotate, ratchet drives sprocket rotation chain drive-belt to move by rotating shaft, and now by the auto-lock function between worm gear and worm screw, prevent the reversing of worm gear, improved stability and safety, when needs unclamp chain, reversion handle rotates counterclockwise worm gear, due to ratchet ratchet when driving ratchet to clockwise rotate can produce a larger reaction force acts on ratchet and this antagonistic force with in background technology, mention chain tension time generation the power of sensing housing be identical in essence, when reversion handle, ratchet can drive chain to come up along with ratchet rotates counterclockwise together under the effect of antagonistic force, and antagonistic force is slow consumption in this course, until ratchet is when stop operating, the complete approach exhaustion of this antagonistic force, the process that chain is unclamped is safer.Now stir shifting part ratchet and ratchet are departed from completely, chain can arbitrarily pull.
In the draw off gear of above-mentioned chain, this sidepiece that is positioned at above-mentioned ratchet on described worm gear is also connected with case, described case is cylindric and coaxially arranges with worm gear, above-mentioned shifting part is the external toothing being set in case outer rim, described external toothing inner side has projection, in above-mentioned case outer rim, offer otch, above-mentioned projection is passed otch and is positioned at above-mentioned case and can slides at otch, described external toothing inner side has plush copper, in above-mentioned case outer rim, offer the recess one matching with plush copper shape, when plush copper is positioned at recess one, described projection is away from above-mentioned ratchet.
When the quick pull of chain or tension, with hand, stir external toothing and make the plush copper of external toothing inner side be positioned at recess one, and now, the projection on external toothing is away from ratchet; By plush copper, be positioned at recess one, when worm gear rotate to drive case to rotate, external toothing is also along with rotation, thereby avoids projection to affect the normal use of the draw off gear of this chain.
In the draw off gear of above-mentioned chain, in above-mentioned case outer rim, also offer the recess two matching with protruding two shapes, this recess two distributes along circumferential with above-mentioned recess one, the contact part two that there is contact part one on above-mentioned ratchet and be meshed with the ratchet of ratchet, when above-mentioned plush copper is positioned at recess two, described projection two makes contact part two depart from the ratchet of above-mentioned ratchet completely.
With hand, stirring external toothing rotates, projection two on external toothing overcome elastic component to the power of ratchet by contact part one to pressing down, drive ratchet and ratchet to depart from, when plush copper is positioned at recess two, ratchet and ratchet depart from completely, and now, recess two also plays positioning action, avoid external toothing to reverse under the effect of elastic component, affect the normal use of the draw off gear of this chain.
In the draw off gear of above-mentioned chain, the contact part two that there is contact part one on described ratchet and be meshed with the ratchet of ratchet, above-mentioned shifting part is pressing plate, this pressing plate is hinged on worm gear and with ratchet and is positioned at being same as on a sidepiece of worm gear, and above-mentioned pressing plate could lean and overcome above-mentioned elastic component around hinge-point rotation elastic force away from above-mentioned contact part one or with contact part one makes contact part two depart from the ratchet of above-mentioned ratchet.
When the quick pull of chain or tension, by external force, rotate pressing plate it is rotated away from contact part two around hinge-point; When reversion handle is when more painstaking, thereby rotate pressing plate by external force, make it around hinge-point, rotate and be resisted against on contact part one and make contact part two away from the ratchet of ratchet.
In the draw off gear of above-mentioned chain, described worm gear sidepiece is fixed with gear tooth axle, and above-mentioned ratchet is hinged on gear tooth axle, described elastic component is torsion spring, torsion spring set is located on gear tooth axle, and this torsion spring one end acts on ratchet, and the other end is connected on worm gear sidepiece.Under the effect of torsion spring, ratchet has the trend in the ratchet that is embedded into ratchet all the time.
In the draw off gear of above-mentioned chain, above-mentioned elastic component is that case is positioned at the flexure strip that incision bends inwards and forms.
When worm gear rotates, drive case to rotate, flexure strip is resisted against on ratchet all the time, thereby ratchet can be stably meshed with the ratchet of ratchet; When sprocket wheel drives ratchet to rotate, the ratchet of ratchet is resisted against on ratchet and overcomes the elasticity of flexure strip, makes ratchet rotate with ratchet and be separated around hinge-point; Under the effect of flexure strip, ratchet has the trend in the ratchet that is embedded into ratchet, prevents that ratchet takes a turn for the worse and chain is unclamped after manually quick tensioning chain.
In the draw off gear of above-mentioned chain, described surface of shell has curved opening, and the opening direction of this opening is relative with aforementioned external teeth circle side.When needs are stirred external toothing, hand is stretched into opening and can stir external toothing rotation, have advantages of easy to use.
In the draw off gear of above-mentioned chain, the bore of described opening is greater than the thickness of aforementioned external teeth circle.Preferably the bore of opening is slightly larger than external toothing thickness, in convenient rotation external toothing, can reduce dust and enter into enclosure interior.
At the hand of above-mentioned chain, put in device, described surface of shell has rounded opening, and above-mentioned pressing plate comprises handshake part and the butting section for contacting with the ratchet of ratchet, and described handshake part part is stretched out opening.Handshake part part is stretched out opening, holds handshake part and is positioned at the part outside housing, facilitates the rotation of pressing plate.
In the draw off gear of above-mentioned chain, described worm gear sidepiece is fixed with gear tooth axle, above-mentioned ratchet is hinged on gear tooth axle, above-mentioned gear tooth axle passes above-mentioned case and is connected by flush fit and case, above-mentioned gear tooth axle outside has annular gear edge, and above-mentioned ratchet and case are all between annular gear edge and worm gear.
Case is fixed on gear tooth axle, with respect to case, is fixed on worm gear, can reduce the procedure of processing of this hand strainer and cut down finished cost; Gear tooth axle outside is provided with annular gear edge, prevents that case and gear tooth plate from coming off from gear tooth axle in rotation process.
In the draw off gear of above-mentioned chain, described worm gear is between ratchet and sprocket wheel.If ratchet is between worm gear and sprocket wheel time, ratchet place need to arrange extra structure and prevent that sprocket wheel from affecting between ratchet rotation or ratchet and sprocket wheel gap is set; Adopt such design, can time this chain draw off gear structure compacter.
In the draw off gear of above-mentioned chain, between the engaging piece that described housing and worm screw are used for and worm gear meshes, be respectively arranged with bearing, bearing described in two is connected on housing by fastener, described worm screw one end is axially connected on above-mentioned bearing, the other end is connected with housing and with handle through another bearing, between described engaging piece and two bearings, be respectively arranged with some balls, and between engaging piece and two bearings, be respectively arranged with for the fixing location structure of ball.
Fastener can be the machanical fasteners such as screw, bolt; Between worm mesh portion and bearing, be fixed with some balls, when ratchet handle drives worm screw to rotate, ball also, along with rotating and can playing rotary action, reduces the friction between worm screw and bearing.
In the draw off gear of above-mentioned chain, above-mentioned location structure comprises that engaging piece one end offers on ball grooves one that shape matches with ball and bearing and offers the ball grooves two that shape matches with ball, described ball grooves one is relative with ball grooves two positions, above-mentioned ball by and ball grooves one and ball grooves two inwalls lean and be fixed between engaging piece and bearing.
When handle drives worm screw to rotate, ball also rotates along ball grooves two inside faces, reduces the friction between ball and bearing, thereby reduces the friction between worm screw and bearing.
In the draw off gear of above-mentioned chain, above-mentioned location structure comprises that engaging piece one end offers the groove that shape matches with ball, and above-mentioned ball is positioned at groove and part is stretched out groove and leans with bearing.
In the draw off gear of above-mentioned chain, described sprocket wheel arranged outside has cover plate and cover plate to be connected in housing, and the contact site that above-mentioned chain is used for contacting with sprocket wheel is between cover plate and sprocket wheel.By cover plate, the contact part of chain is covered, can effectively prevent that foreign material or dust from entering.
In the draw off gear of above-mentioned chain, above-mentioned rotating shaft is connected and is fixed by key with ratchet.This connection mode can make worm gear and sprocket wheel circumferentially fixing, transmission campaign and torque that simultaneously can be stable.
In the draw off gear of above-mentioned chain, above-mentioned rotating shaft and ratchet fix by spline joint.Its connection of spline joint is more firm.
In the draw off gear of above-mentioned chain, the other end that described chain stretches out housing is connected with draw ring.The chain other end is connected with draw ring, facilitates the pull of chain.
In the draw off gear of above-mentioned chain, above-mentioned handle is ratchet handle.Handle is used ratchet handle, can control very easily the rotation direction of worm screw.
Compared with prior art, the draw off gear of this chain has the following advantages:
1, by manually pulling draw ring and rotating ratchet handle to realize the conversion between the quick pull of chain and tension, there is rapid operation, simple advantage;
While 2, unclamping chain by reversion handle, the antagonistic force that ratchet produces can slowly digest chain is unclamped safely in handle reverses this process, by stirring external toothing, the ratchet of ratchet and ratchet being departed from completely, have advantages of that simple to operate, chain unclamps safe;
3, by the auto-lock function between worm gear and worm screw, prevented the reversing of worm gear, improved stability and safety.
Accompanying drawing explanation
Fig. 1 is the axle geodesic structure schematic diagrams such as draw off gear of this chain.
Fig. 2 is the left TV structure schematic diagram of the draw off gear of this chain.
Fig. 3 is the backsight structural representation that the draw off gear of this chain is removed housing and hook two.
Fig. 4 is the right TV structure schematic diagram that the draw off gear of this chain is removed housing and hook two.
Fig. 5 is the forward sight structural representation that the draw off gear of this chain is removed housing and hook two.
Fig. 6 is the structural representation that case is connected with external toothing.
Fig. 7 is the structural representation of external toothing.
Fig. 8 is the structural representation of case.
Fig. 9 is the structural representation that ratchet is connected with gear tooth axle.
Figure 10 is the blast structural representation that worm screw is connected with bearing.
Figure 11 is the structural representation that draw off gear chain when tension ratchet of this chain is connected with ratchet.
The structural representation that when Figure 12 is the quick pull of chain, ratchet is connected with ratchet.
Figure 13 is the chain structural representation that ratchet is connected with ratchet while unclamping.
In figure, 1, housing; 1a, upper shell; 1b, middle shell; 1b1, opening; 1c, lower house; 2, worm screw; 2a, engaging piece; 2b, ball grooves one; 3, worm gear; 4, rotating shaft; 5, handle; 6, bearing; 7, hook two; 8, ball; 9, bearing pin; 10, ratchet; 11, lining; 12, sprocket wheel; 13, chain; 14, hook one; 15, draw ring; 16, ratchet; 16a, contact part one; 16b, contact part two; 17, gear tooth axle; 17a, annular gear edge; 18, case; 18a, flexure strip; 18b, otch; 18c, recess one; 18d, recess two; 19, external toothing; 19a, projection; 19b, plush copper; 20, cover plate.
The specific embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
Embodiment mono-
As shown in Figure 1, Figure 2 and Figure 3, the housing 1 that the draw off gear of this chain is cavity by inside, worm screw 2, worm gear 3, rotating shaft 4, ratchet 16, elastic component, ratchet handle 5{ refer to: bidirectional ratchet 10 spanners [application number: 201120164696.3; Granted publication number: CN202129748U] } etc. composition.
Wherein, as shown in Figure 1, housing 1 comprises that upper shell 1a, the middle shell 1b and the lower house 1c that are mutually connected form.Middle shell 1b upper end inner side is provided with bearing 6, the quantity of bearing 6 be 2 and position relative.Fastener is through upper shell 1a, middle shell 1b be fixed on bearing 6, and bearing 6 opposite sides are also fixed on middle shell 1b upper end by fastener, and fastener can be the machanical fasteners such as bolt, screw.Upper shell 1a top is connected with hook 27, and middle shell 1b lower end is by being tightly fixed in lower house 1c.
Worm screw 2 is positioned at inner side, middle shell 1b upper end and is axially connected with middle shell 1b, and specifically, worm screw 2 one end are stretched in one of them bearing 6 and are axially connected with this bearing 6, and worm screw 2 other ends are connected with housing 1 and with ratchet handle 5 through another bearing 6.Worm screw 2 for and the engaging piece 2a of worm gear 3 engagement and two bearings 6 between be respectively arranged with some balls 8, and between engaging piece 2a and two bearings 6, be respectively arranged with for the fixing location structure of ball 8.As shown in figure 10, this location structure comprises that engaging piece 2a one end offers on ball grooves one 2b that shape matches with ball 8 and base and offers the ball grooves two that shape matches with ball 8, and ball grooves one 2b is relative with ball grooves two positions, ball 8 by and ball grooves one 2b and ball grooves two inwalls lean and be fixed between engaging piece 2a and base 6, by worm screw 2, driving ball 8 to rotate makes ball 8 rotate along ball grooves two inside faces, reduces the friction between worm screw 2 and base 6.Nature, location structure also can be for engaging piece 2a one end offers the groove that shape matches with ball 8, and above-mentioned ball 8 is positioned at groove and part is stretched out groove and leans with bearing 6.
Rotating shaft 4 is arranged in middle shell 1b, and rotating shaft 4 two ends are all stretched out middle shell 1b and are connected with bearing pin 9, and countershaft 4 carries out axial limiting and prevents that rotating shaft 4 from coming off from middle shell 1b in rotation process simultaneously.Rotating shaft 4 one end are fixed with ratchet 10 and this ratchet 10 is a single direction ratchet 10, and ratchet 10 is positioned at middle shell 1b.In the present embodiment, ratchet 10 fixes by spline joint with rotating shaft 4.Preferably between ratchet 10 and rotating shaft 4, lining 11 is set, this lining 11 comprises that body and lining 11 body outside portions that are column type have annular convex shoulder, and during use, annular convex shoulder is positioned at outside middle shell 1b and is resisted against on middle shell 1b outer wall.By lining 11 is set, not only can reduces ratchet 10 and directly contact with rotating shaft 4 wearing and tearing that cause, and can make in rotating shaft 4 is more stably axially fixed in housing.
As shown in Figure 4, rotating shaft 4 other ends are fixed with sprocket wheel 12 and sprocket wheel 12 is positioned at middle shell 1b.On sprocket wheel 12, be tied with chain 13, lower house 1c is all stretched out at chain 13 two ends and chain 13 is wherein fixed with hook 1 in one end, and the other end is fixed with draw ring 15.In the present embodiment, ratchet 10 also fixes by spline joint with rotating shaft 4.Between ratchet 10 and rotating shaft 4, lining 11 is set, during use, annular convex shoulder is positioned at outside middle shell 1b and is resisted against on middle shell 1b outer wall.By lining 11 is set, not only can reduces sprocket wheel 12 and directly contact with rotating shaft 4 wearing and tearing that cause, and can make rotating shaft 4 more stably be axially fixed in middle shell 1b.
Worm gear 3 is set in rotating shaft 4 and can freely rotates with respect to rotating shaft 4, and worm gear 3 can not directly drive rotating shaft 4 rotations or rotating shaft 4 can not directly drive worm gear 3 to rotate.Preferential selection worm gear 3 meshes between ratchet 10 and sprocket wheel 12 and with worm screw 2, makes this chain draw off gear structure compacter.Nature, ratchet 10 is also fine between worm gear and sprocket wheel 12.
As shown in Figure 3, this sidepiece that is positioned at above-mentioned ratchet 10 on worm gear 3 is hinged with ratchet 16, in the present embodiment, is also fixed with the same side that gear tooth axle 17 and gear tooth axle 17 and ratchet 10 are positioned at worm gear 3 on worm gear 3, and ratchet 16 is hinged on gear tooth axle 17.
Elastic component is between ratchet 16 and worm gear 3, and preferred elastomeric part and ratchet 10 are positioned at the same side.Under the effect of elastic component, ratchet 16 has the trend in the ratchet that is embedded into ratchet 10 all the time.
In the present embodiment, between ratchet 10 and worm gear 3, be also provided with and be case 18 cylindraceous and case 18 and coaxially arrange with worm gear 3.The preferential gear tooth axle 17 of selecting passes case 18 and is connected by flush fit and case 18.Nature case 18 is fixed on worm gear 3 and is also fine.Gear tooth axle 17 outsides have annular gear along 17a, and gear tooth plate 16 and case 18 all keep off along between 17a and worm gear 3 in annular.Case 18 is made by elastomeric material, such as plastics, rubber etc.
As shown in Fig. 3 and Fig. 8, in case 18 outer rims, also offer otch 18b, elastic component is that case 18 is positioned at the flexure strip 18a that otch 18b place bends inwards and forms, this flexure strip 18a is resisted against and on ratchet 16, makes to keep off tooth plate 16 and have the trend being embedded in ratchet 10.
As shown in Fig. 3, Fig. 6 and Fig. 7, ratchet place is also provided with a shifting part, by external force, stirs the ratchet that this shifting part can make ratchet overcome the elastic force of above-mentioned elastic component and depart from ratchet.In the present embodiment, shifting part is the external toothing 19 being set in case 18 outer rims, and external toothing inner side has protruding 19a, and protruding 19a passes otch 18b and is positioned at case 18.The length of otch 18b is greater than the width of protruding 19a, and protruding 19a can be along circumferentially sliding in otch 18b.
As shown in Figure 9, on ratchet 16, have contact part one 16a and with contact part two 16b of the ratchet engagement of ratchet 10, the elastic force that projection 19a could lean and overcome flexure strip 18a away from contact part one 16a or with contact part two 16b when protruding 19a slides in otch 18b makes contact part two 16b depart from the ratchet of ratchets 10.
Further optimize, external toothing 19 inner sides have plush copper 19b, in case 18 outer rims, offer recess one 18c and recess two 18d that match with plush copper 19b shape, when plush copper 19b is positioned at recess one 18c, two 19a are away from contact part one 16a for projection, stirring gear ring makes plush copper 19b depart from recess one 18c and move to recess two 18d, now plush copper 19b contacts with contact part one 16a and contact part one 16a is pressed down, when plush copper 19b is positioned at recess two 18d, contact part two 16b are complete and ratchet 10, and ratchet departs from, and now, recess two 18d can position plush copper 19b, avoid external toothing 19 under the effect of flexure strip 18a away from contact part one 16a.
As shown in Figure 2, middle shell 1b offers arc opening 1b1 on surface, and the opening direction of opening 1b1 is relative with external toothing 19 sides.Preferably the bore of opening 1b1 is greater than the thickness of gear ring.
In the draw off gear of this chain, sprocket wheel 12 arranged outside have cover plate 20 and cover plate 20 both sides to be connected in middle shell 1b by fastener, have the guide frame that chain 13 is led in moving process on cover plate 20.Guide frame is mounting hole and two chain communicating with mounting hole 13 grooves that run through on cover plate 20, two chain 13 grooves lay respectively at the both sides of mounting hole, sprocket wheel 12 is positioned at mounting hole place, and chain 13 is through at two chains, 13 groove places for the contact part contacting with sprocket wheel 12.In the present embodiment, chain 13 grooves are cross bore.
During work, first will link up with one fixes with hook two, rotating external toothing 19 makes plush copper 19b be positioned at recess one 18c, manually pull draw ring 15 band movable sprockets 12 to rotate, chain 13 band movable sprockets 12 rotate, because spline joint is passed through in ratchet 10 and rotating shaft 4, therefore sprocket wheel 12 drives ratchet 10 to realize rotation by rotating shaft 4, as described in Figure 12, ratchet 10 is along clockwise rotating, now the ratchet of ratchet 10 is resisted against on ratchet and thereby the elastic force that overcomes flexure strip 18a makes ratchet rotate and be separated with ratchet 10 around hinge-point, by chain 13 tensions; When by manually again after tensioning chain 13, rotating ratchet handle 5 drives worm gear 3 to rotate, as described in Figure 11, worm gear 3 drive ratchets 16 clockwise rotate in the ratchet that makes ratchet embed ratchet 10 and are meshed with it and drive ratchet 10 to rotate, further tensioning chain 13; When needs unclamp chain 13, rotate backward ratchet handle 5, worm gear 3 drive ratchets 16 to rotate counterclockwise and now ratchet 10 from along with ratchet 16 rotates counterclockwise together, chain is unclamped safely; As shown in figure 13, now stirring external toothing 19 makes plush copper 19b be positioned at recess two 18d to make ratchet 16 depart from the ratchet of ratchet 10 completely, can arbitrarily pull chain 13.
This chain hand is put draw off gear and be can be used as strainer use, and goods is played to tensioning function; Can be used as again cucurbit and use, play the effect of cargo lifting.
Embodiment bis-
The present embodiment is basic identical with structure and the principle of embodiment mono-, and difference is: elastic component is torsion spring, and torsion spring set is located on gear tooth axle 17, and torsion spring one end acts on ratchet 16, and the other end is connected on worm gear 3 sidepieces.And ratchet 16 has the trend in the ratchet that is embedded into ratchet 10 all the time under the effect of torsion spring.
Embodiment tri-
The present embodiment is basic identical with structure and the principle of embodiment mono-, difference is: shifting part is pressing plate, this pressing plate is hinged on this sidepiece that is positioned at ratchet 10 on worm gear 3, and pressing plate could lean and overcome elastic component around hinge-point rotation elastic force away from contact part one 16a or with contact part one 16a makes contact part two 16b depart from ratchets 10.Housing 1 surface has rounded opening, and pressing plate comprises handshake part and the butting section contacting for the ratchet with ratchet 16, and described handshake part part is stretched out opening.Handshake part part is stretched out opening, holds handshake part and is positioned at the part outside housing, facilitates the rotation of pressing plate.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (10)
1. the draw off gear of a chain, comprise that an inside is the housing of cavity (1), in described housing (1), be provided with a rotating shaft (4), described rotating shaft (4) one end is fixed with sprocket wheel (12), on described sprocket wheel (12), be wound with chain (13), this chain (13) two ends are all stretched out housing (1) and in wherein one end of chain (13), are fixed with hook one (14), in described housing (1), be also axially fixed with worm screw (2), described worm screw (2) outer end is stretched out housing (1) and is connected with one handle (5), it is characterized in that, described rotating shaft (4) other end is fixed with ratchet (10), in described rotating shaft (4), be arranged with worm gear (3) and this worm gear (3) and worm screw (2) engagement, this sidepiece that is positioned at above-mentioned ratchet (10) on described worm gear (3) is hinged with ratchet (16), between described ratchet (16) and worm gear (3), be provided with the elastic component that makes above-mentioned ratchet (16) be embedded into the ratchet trend of ratchet (10), described ratchet (16) locates to be also provided with a shifting part, by external force, stir the ratchet that this shifting part can make ratchet (16) overcome the elastic force of above-mentioned elastic component and depart from ratchet (10).
2. the draw off gear of chain according to claim 1, it is characterized in that, this sidepiece that is positioned at above-mentioned ratchet (10) on described worm gear (3) is also connected with case (18), described case (18) is cylindric and coaxially arranges with worm gear (3), above-mentioned shifting part is for being set in the external toothing (19) in case (18) outer rim, described external toothing (19) inner side has projection (19a), in above-mentioned case (18) outer rim, offer otch (18b), above-mentioned projection (19a) is passed otch (18b) and is positioned at above-mentioned case (18) and can slides at otch (18b), described external toothing (19) inner side has plush copper (19b), in above-mentioned case (18) outer rim, offer the recess one (18c) matching with plush copper (19b) shape, when plush copper (19b) is positioned at recess one (18c), described projection (19a) is away from above-mentioned ratchet (16).
3. the draw off gear of chain according to claim 2, it is characterized in that, in above-mentioned case (18) outer rim, also offer the recess two (18d) matching with projection (19a) shape, this recess two (18d) circumferentially distributes with above-mentioned recess one (18c) edge, the contact part two (16b) that there is contact part one (16a) on above-mentioned ratchet (16) and be meshed with the ratchet of ratchet (10), when above-mentioned plush copper (19b) is positioned at recess two (18d), the ratchet that described projection (19a) makes contact part two (16b) depart from above-mentioned ratchet (10) completely.
4. the draw off gear of chain according to claim 1, it is characterized in that, the contact part two (16b) that there is contact part one (16a) on described ratchet (16) and be meshed with the ratchet of ratchet (10), above-mentioned shifting part is pressing plate, it is upper and be positioned at being same as on a sidepiece of worm gear (3) with ratchet (10) that this pressing plate is hinged on worm gear (3), and above-mentioned pressing plate rotates and can away from above-mentioned contact part one (16a) or with contact part one (16a), lean and overcome the ratchet that the elastic force of above-mentioned elastic component makes contact part two (16b) depart from above-mentioned ratchet (10) around hinge-point.
5. according in the draw off gear of the chain described in claim 2 or 3 or 4, it is characterized in that, described worm gear (3) sidepiece is fixed with gear tooth axle (17), above-mentioned ratchet (16) is hinged on gear tooth axle (17), described elastic component is torsion spring, it is upper that above-mentioned torsion spring set is located at gear tooth axle (17), and it is upper that this torsion spring one end acts on ratchet (16), and the other end is connected on worm gear (3) sidepiece.
6. according in the draw off gear of the chain described in claim 2 or 3, it is characterized in that, above-mentioned elastic component is that case (18) is positioned at the flexure strip (18a) that otch (18b) is located to bend inwards and formed.
7. the draw off gear of chain according to claim 6, it is characterized in that, described worm gear (3) sidepiece is fixed with gear tooth axle (17), above-mentioned ratchet (16) is hinged on gear tooth axle (17), described gear tooth axle (17) passes above-mentioned case (18) and is connected by flush fit and case (18), above-mentioned gear tooth axle (17) outside has annular gear along (17a), and above-mentioned ratchet (16) and case (18) are all positioned at annular gear along between (17a) and worm gear (3).
8. according to the draw off gear of the chain described in claim 2 or 3, it is characterized in that, described housing (1) surface has curved opening (1b1), and the opening direction of this opening (1b1) is relative with aforementioned external teeth circle (19) side.
9. the draw off gear of chain according to claim 1, it is characterized in that, described housing (1) and worm screw (2) for and the engaging piece (2a) of worm gear (3) engagement between be respectively arranged with bearing (6), bearing described in two (6) is connected on housing (1) by fastener, described worm screw (2) one end is axially connected on above-mentioned bearing (6), the other end is connected with housing (1) and with handle (5) through another bearing (6), between described engaging piece (2a) and two bearings (6), be respectively arranged with some balls (8), and between engaging piece (2a) and two bearings (6), be respectively arranged with for the fixing location structure of ball (8).
10. the draw off gear of chain according to claim 9, it is characterized in that, above-mentioned location structure comprises that engaging piece (2a) one end offers on ball grooves one (2b) that shape matches with ball (8) and bearing (6) and offers the ball grooves two that shape matches with ball (8), described ball grooves one (2b) is relative with ball grooves two positions, above-mentioned ball (8) by and ball grooves one (2b) and ball grooves two inwalls lean and be fixed between engaging piece (2a) and bearing (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420340670.3U CN204021281U (en) | 2014-06-24 | 2014-06-24 | A kind of draw off gear of chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420340670.3U CN204021281U (en) | 2014-06-24 | 2014-06-24 | A kind of draw off gear of chain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204021281U true CN204021281U (en) | 2014-12-17 |
Family
ID=52061179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420340670.3U Withdrawn - After Issue CN204021281U (en) | 2014-06-24 | 2014-06-24 | A kind of draw off gear of chain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204021281U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058121A (en) * | 2014-06-24 | 2014-09-24 | 浙江双友物流器械股份有限公司 | Retracting and releasing device for chain |
| CN106081213A (en) * | 2016-08-05 | 2016-11-09 | 浙江双友物流器械股份有限公司 | A kind of chain tensioner |
-
2014
- 2014-06-24 CN CN201420340670.3U patent/CN204021281U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058121A (en) * | 2014-06-24 | 2014-09-24 | 浙江双友物流器械股份有限公司 | Retracting and releasing device for chain |
| CN104058121B (en) * | 2014-06-24 | 2016-03-02 | 浙江双友物流器械股份有限公司 | A kind of draw off gear of chain |
| CN106081213A (en) * | 2016-08-05 | 2016-11-09 | 浙江双友物流器械股份有限公司 | A kind of chain tensioner |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141217 Effective date of abandoning: 20160302 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |