CN207064412U

CN207064412U - Telescopic rod

Info

Publication number: CN207064412U
Application number: CN201720323023.5U
Authority: CN
Inventors: 覃平
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-03-29
Filing date: 2017-03-29
Publication date: 2018-03-02
Anticipated expiration: 2027-03-29

Abstract

The utility model discloses a kind of telescopic rod, from at least two Guan You little toward connecting together successively greatly, can upper and lower telescopic adjustment between adjacent tubes, by first sleeve, second sleeve pipe, locking device, sealing ring forms, wherein, first sleeve is locked or unscrewed with the second sleeve pipe by locking device, sealing ring is provided with the top of locking device, sealing ring is equipped with locking device, so that in the case of locking device will not be held improperly because of power, lock sleeve is easy to back-out from expansion link, so that the part of the inside drops out, influence support normal use, and sealing ring can play dustproof and waterproof sand prevention effect, first sleeve of the present utility model and the structure of the second sleeve pipe can be realized and avoid pipe decrease speed too fast, for adjusting the problem that brings some inconvenience；Before the second sleeve pipe is not locked, can avoid because the pipe of the inside is easy to fall down, decrease speed is too fast, and causes to impact bottom, damage correlation component the problem of.

Description

Telescopic rod

Technical field

Expansion link technical field is the utility model is related to, more particularly to a kind of dust-proof, anti-dropout telescopic rod.

Background technology

Support, the framework to play a supportive role, the application of support is extremely extensive, can meet everywhere in Working Life, support Flexible modulation height typically is realized by using the structure of expansion link, such as installing the equipment such as video camera, projecting apparatus Support, such as camera mount can adjust the shooting height of video camera and avoid the shake in shooting, so as to improve shooting Machine machine stability, further enhances the shooting effect of video camera, and current camera mount mainly has single pin and tripod type to stretch Two kinds of bar, every expansion link are all from least two Guan You little toward connecting together successively greatly, can be stretched up and down between adjacent tubes Contracting regulation, is tightened after the completion of regulation by turning locking device.It will image when in use on the head of camera frame, Adjusting camera stand height come the length of that section of adjacent tubes corresponding to it of stretching by unscrewing lock sleeve again whenever necessary, adjusting Locking device is tightened after the completion of section again.

Then there is problems with common Telescopic shaft type support,

First, because the place for using support is a lot, have interior also has the more special place of environment certainly, such as Seashore, high mountain, deep valley etc., these local environment are more changeable, are likely to encounter strong wind or rainstorm weather, at this moment A-frame Just it is easy into water, enters sand, if not paying attention to maintaining, it is easy to causes the breakage and aging of support, reduce service life, mesh Before, expansion link is generally to use structure as shown in Figure 1, and the expansion link in Fig. 1 is mainly by first sleeve 1, the second sleeve pipe 2, locking Device 3 is formed, and by turning locking device, realizes the flexible of expansion link and fixed, using this structure sand dust, water, very It is easily accessible to expansion link, so as to cause breakage to support, and in the case of power is held improperly, lock sleeve is easy to from stretching Back-out in contracting bar, so that the part of the inside drops out, influence support normal use, when by expansion link and other components When mutually assembling, installation fixed routine is complicated, safeguards inconvenience；

Second, during installation video camera or projecting apparatus, because expansion link is during lifting, before not locking, The pipe of the inside is easy to fall down, and decrease speed is too fast, and bottom is impacted, and may damage the component of correlation；

3rd, adjust in high process, pipe decrease speed is too fast, is brought some inconvenience for adjustment；So that adjustment , it is necessary to which more people operate during height；

4th, when due to neglecting not by flexible rod locking, then the second sleeve pipe in expansion link is easy to slide from inside, It can then cause the projecting apparatus after assembling, video camera unstable, influence its using effect；

5th, finished in use, support is withdrawn, now, after video camera or projecting apparatus are disassembled, then will be flexible Second sleeve pipe of bar support is accommodated in inside first sleeve, now, when the second sleeve pipe is not locked, is quickly entered to first sleeve Portion, due to excessive velocities, easily the lock sleeve of the second sleeve pipe is impacted to the lock sleeve of first sleeve, usage time is long Afterwards, can influence in the life-span, misoperation, may accidentally hurt hand.

Therefore, it is badly in need of a kind of telescopic rod to solve the above problems.

Utility model content

The deficiency for more than, the utility model provide can dust-proof anti-dropout, and what can slowly be stretched a kind of new stretches Toward connecting together successively greatly, the second sleeve pipe is slidably installed in first set by contracting bar, a kind of telescopic rod, including at least two Guan You little Inside pipe, adjacent two pipes are connected by locking device, and the locking device includes retaining ring, locking knob, the lock Tight ring set is located between adjacent two pipes, and the locking knob is set between the first sleeve and locking knob, in addition to Sealing ring, the sealing ring are fixed and are set in first sleeve, and the bottom of the annulus of the sealing ring is convexly equipped with downwards more Individual limiting section, the locking knob are arranged with the second groove corresponding to limiting section, and the limiting section bottom is in barb shape, described The bottom of limiting section is spacing in the second groove.

In order to further realize the utility model, the first sleeve is provided with the first sealing close to apical position, described The side of the madial wall of first sleeve is longitudinally provided with passage, and the passage is communicated with first sleeve inner chamber, and the passage is provided with Compression relief cock, lower single position of the passage are provided with the second sealing, and the centre position of second sealing is provided with to be passed through up and down Logical through hole, the top of second sleeve pipe are provided with piston structure, and the piston structure includes piston and piston rod, the piston It is slidably installed on the inwall of first sleeve, the piston moves in the first sealing with the second sealing, and the piston rod passes through Through hole simultaneously stretches out through hole.

In order to further realize the utility model, the lower end position that the first sealing is located in first sleeve inwall, Inwardly it is convexly equipped with first stop part, the upper end position that the second sealing is located in first sleeve inwall, inside projection There is second stop part.

In order to further realize the utility model, the lower end position that the first sealing is located in first sleeve inwall, Inwardly symmetrically it is convexly equipped with two the first stop parts, the upper end position that the second sealing is located in first sleeve inwall, inwardly Symmetrically it is convexly equipped with two the second stop parts.

In order to further realize the utility model, the passway on the passage top is arranged on the first stop part and first close Between envelope portion.

In order to further realize the utility model, the passway of the passage bottom is arranged on the second stop part and the second envelope Between portion.

In order to further realize the utility model, the bottom outer wall of the first sleeve is circumferentially with external screw thread, first set The inside at ttom of pipe end is provided with an inclined-plane, and the top of retaining ring is provided with corresponding with the corresponding matching on the inclined-plane of first sleeve inwall oblique Face, the inclined surface of retaining ring are fastened at the inclined-plane of first sleeve, the corresponding external screw thread with first sleeve of the locking knob Provided with internal thread.

In order to further realize the utility model, locking device also includes lock sleeve, and the lock sleeve is set in locking rotating On button, the outer surface of the lock sleeve is provided with anti-slip tank.

In order to further realize the utility model, the expansion link is socketed to form by least three-level sleeve pipe, in the second sleeve pipe Madial wall side longitudinally be provided with second channel, the second channel is communicated with the second sleeve pipe, and the second channel is provided with Second compression relief cock, the bottom of second sleeve pipe are provided with the 3rd sealing, and the 3rd sealing is provided with the logical of up/down perforation Hole, the 3rd cannula tip are provided with second piston structure, and the second piston structure includes second piston and second piston bar, described Second piston is slidably installed on the inwall of the second sleeve pipe, and the piston rod is through through hole and stretches out through hole.

In order to further realize the utility model, second sleeve pipe is inwardly convexly equipped with the 3rd close to the inwall of apical position Stop part, it is described to be inwardly convexly equipped with the 4th stop part on the inwall of the upper end of the 3rd sealing on the second sleeve pipe.

Beneficial effect：

1st, one of goal of the invention of the present utility model, when needing to adjust height, turn winding device, the second sleeve pipe to Lower movement, when being moved to the position of needs, winding device screws, and by provided with sealing ring, and sealing ring is provided with locating part, lock Tight knob is provided with the second groove, then the part of the second groove upper end of locking knob is connected between locating part and annulus, The bottom part of sealing ring locating part is caught in the second groove so that during turn knobs, will not move up and down, and locking device Also will not fall off, while the particle such as extraneous dust, sand will not be also entered to inside locking device, so as to so as to be made to support Into breakage.

2nd, the two of goal of the invention of the present utility model, by being provided with the first sealing close to apical position in first sleeve Portion, the side of the madial wall of first sleeve are longitudinally provided with passage, and passage is communicated with first sleeve inner chamber, and passage is opened provided with pressure release Close, the lower end position of passage is provided with the second sealing, through hole of the centre position provided with up/down perforation of the second sealing, second set The top of pipe is provided with piston structure, and piston structure includes piston and piston rod, and piston is slidably installed on the inwall of first sleeve, piston Moved in the first sealing with the second sealing, piston rod is through through hole and stretches out through hole, when needing to adjust height, passes through Locking device is turned, under piston effect, piston slowly glides the second sleeve pipe in closed containing cavity, can avoid pipe decrease speed It is too fast, for adjusting the problem that brings some inconvenience；And during adjustment height, it is not necessary to which more people's operations can be achieved to adjust It is whole, before the second sleeve pipe is not locked, it can avoid because the pipe of the inside is easy to fall down, decrease speed is too fast, and causes pair Bottom impacts, may damage correlation component the problem of.

3rd, the three of the purpose of the present utility model, reason can be avoided in carelessness not by flexible rod locking, then in expansion link The second sleeve pipe be easy to slide from inside, and cause the projecting apparatus after assembling, video camera unstable, influence its and use effect The problem of fruit；Finished in use, support is withdrawn, now, after video camera or projecting apparatus are disassembled, then by expansion link branch Second sleeve pipe of frame is accommodated in inside first sleeve, now, can solve because the second sleeve pipe do not lock when, quickly enter to first set Inside pipe, due to excessive velocities, easily the lock sleeve of the second sleeve pipe is impacted to the lock sleeve of first sleeve, usage time Long afterwards, the life-span can be influenceed, misoperation, the problem of may accidentally hurting hand.

4th, the four of the purpose of the present utility model, inwardly stop is convexly equipped with by being provided with the inwall of first sleeve Portion, it is avoided that piston excessively moves down or up and props up the first sealing or the second sealing, keeps closed containing cavity by living Plug is divided into the state in two sections.

Brief description of the drawings

Fig. 1 is the structural representation of conventional telescopic bar；

Fig. 2 is the structure sectional view of the expansion link of the utility model embodiment one；

Fig. 3 is the Telescopic rod structure schematic diagram of the utility model embodiment one；

Fig. 4 is the enlarged diagram being connected with the second sleeve pipe, first sleeve of locking device in the utility model Fig. 2；

Fig. 5 is seal ring structure schematic diagram；

Fig. 6 this seal ring structure schematic diagrames；

Fig. 7 is the overall structure sectional view of embodiment two；

The first sleeve of Fig. 8 the utility model embodiments two and the second sleeve pipe original state structure sectional view；

Fig. 9 is the pressure release face structural representation of compression relief cock；

Figure 10 is that compression relief cock is arranged on first sleeve sectional view；

Figure 11 is the structure sectional view that the sleeve pipe of the utility model embodiment 2 second stretches out first sleeve；

After Figure 12 has used expansion link for embodiment two, when expansion link is withdrawn, oppositely positioned first sleeve and second The structure sectional view of sleeve pipe；

Figure 13 is a state diagram during Fig. 9 is withdrawn；

Figure 14 is the internal structure sectional view of triode.

Embodiment

The utility model is further described in detail below in conjunction with the accompanying drawings, these accompanying drawings are simplified signal Figure, only illustrates basic structure of the present utility model, the direction of this specific implementation is using Fig. 2 directions as standard in a schematic way.

Embodiment one

As in Figure 2-4, present embodiment discloses a kind of waterproof, dust-proof, sand prevention and the expansion link of anti-dropout, this reality With new expansion link from least two Guan You little toward connecting together successively greatly, between adjacent tubes can upper and lower telescopic adjustment, The present embodiment is mainly made up of by taking two sections as an example first sleeve 1, the second sleeve pipe 2, locking device 3, sealing ring 4, wherein,

The diameter of second sleeve pipe 2 is slightly less than first sleeve 1, and the second sleeve pipe 2 is slidably installed in inside first sleeve 1, first sleeve 1 bottom outer wall is circumferentially with external screw thread, and the inside of the bottom of first sleeve 1 is provided with an inclined-plane 11；

First sleeve 1, the second sleeve pipe 2 can upper and lower telescopic adjustment, by locking device 3 by the sleeve pipe 2 of first sleeve 1 and second Locking, locking device 3 include retaining ring 31, locking knob 32, lock sleeve 33, wherein, retaining ring is set in first sleeve 1 and the Between two sleeve pipes 2, and it is located at the bottom of first sleeve 1, the second cannula tip position, the top of retaining ring 31 is provided with and first sleeve The inclined surface 311 of the corresponding matching on the inclined-plane 11 of 1 inwall, the inclined surface 311 of retaining ring 31 are fastened on the oblique of first sleeve 1 At face 11, first sleeve 1 is stretched out in the bottom of retaining ring 31, and the outer wall convex of the close bottom position of retaining ring 31 is provided with convex Ring 312, the bottom end of bulge loop 312 dip down ramp-like.

The inwall of locking knob 32 is provided with internal thread, and locking knob 32 is threaded in the outside of first sleeve 1, locking The bulge loop 312 that the bottom of knob 32 corresponds to retaining ring 31 is arranged with the first annular groove 321 of corresponding matching, so that revolving The bottom of tight knob 32 engages with the bottom of retaining ring 31 so that can promote when screwing locking knob 32 and be moved down in retaining ring 31 Dynamic, the inwall of the close top end of locking knob 32 is also arranged with the second groove 322.

Lock sleeve 33 is set in the outside of locking knob 32, and the outer surface of lock sleeve 33 is provided with anti-slip tank, prevents rotation lock Tight knob 32 skids.

Sealing ring 4 is arranged between locking knob 32 and first sleeve 1, and positioned at the top end of locking knob 32, sealing Ring 4 is set in first sleeve 1, and the diameter of sealing ring 4 enables sealing ring 4 to be tightly fitted in first sleeve 1, close Seal ring 4 includes annulus 41, limiting section 42, and for limiting section to be formed by the downward projection of annulus, the bottom of limiting section 42 is class Like triangle barb shape, the upper surface of triangle barb 43 suppresses the upper surface of the second groove 322 of locking knob 32, Triangular barb engaging is arranged in the second groove 322, and the tip portion of locking knob 32 is connected to ring 41 and fallen with triangle Between hook 43, the second groove is set corresponding to limiting section 42, so as to avoid locking knob 32 from holding improper, lock due to strength Tight device is easy to back-out downward turn from expansion link and come off, while sealing ring 4 is closely set in first sleeve 1, then The materials such as the dust, water, sand of outside can be avoided to enter to inside locking device, so as to cause breakage to support.

The operation principle of the present embodiment：When needing to adjust height, winding device is turned, the second sleeve pipe moves down, When being moved to the position of needs, winding device screws, and by provided with sealing ring, and sealing ring is provided with locating part, locking knob Provided with the second groove, then the part of the second groove upper end of locking knob is connected between locating part and annulus, sealing ring The bottom part of locating part is caught in the second groove so that during turn knobs, will not move up and down, and locking device also will not Come off, while the particle such as extraneous dust, sand will not be also entered to inside locking device, so as to so as to be caused brokenly to support Damage.

Embodiment two

As illustrated in figures 6-10, the present embodiment is mainly filled by taking two-stage sleeve pipe as an example by first sleeve 1, the second sleeve pipe 2, locking 3, sealing ring 4 is put to form, wherein,

The bottom outer wall of first sleeve 1 is circumferentially with external screw thread, and the inside of the bottom of first sleeve 1 is provided with an inclined-plane 11, such as Shown in Fig. 6-10, first sleeve 1 is provided with a sealing 12 close to apical position, sealing 12 by the end sealing of first sleeve 1, So as to avoid the inner chamber of first sleeve 1 from being communicated with the external world, it is located at the lower end position of the first sealing 12 in the inwall of first sleeve 1, to The first stop part 13 is inside convexly equipped with, stop part 13 is used to avoid piston from excessively down or up moving, preferably two, symmetrically set Put the inwall in first sleeve 1, longitudinally passage 14 be provided with the side of the madial wall of first sleeve 1, the present embodiment using left side as Example, the passway of the apical position of passage 14 is between the first sealing 12 and the first stop part 13, and passway and first Communicated inside sleeve pipe 1, passage 14 is provided with compression relief cock 141, there is the through hole that left and right penetrates, compression relief cock 141 at passage left end It is arranged in through hole；

Compression relief cock 141 includes pressure release face 1411, and bar 1412, pressure release face 1411 is fitted on the outer wall of first sleeve, let out Pressure surface 1411 is preferably provided with male member 1413, the material of male member 1413 using the material of elasticity, the both ends convex in pressure release face 1411 Using rigid, the groove for being provided with and being adapted on male member 1413, the area ratio of the bottom of bar 1412 are corresponded on outer tube Through hole is big, and the shape of bottom can be bonded with outer tube, and the size of bar 1412 is slightly identical with through hole, and bar 1412 is in through hole Mobile, pressure release face top is provided with draw ring 1414, corresponding to the place of draw ring 1414, provided with groove 1415 so that draw ring 1414 is fixed In in groove, when needing pressure release, draw ring 1414 is pulled out, pull bar driven rod 1412 is pulled out outside passage so that at passage 14 In opening state, after pressure release is complete, then it will press inward, male member 1413 is caught in groove, in order to avoid convex compression relief cock departs from the Sleeve, magnetic part and magnetic absorption member can be provided with male member 1413 and groove so that more firm, set pipe of the present utility model There is certain thickness, therefore, the setting of compression relief cock does not influence the intensity of sleeve pipe.

The lower end of first sleeve 1 is provided with the second stop part 15, the lower end of the second stop part 15 corresponding to the first stop part 13 Provided with the second sealing 16, first sleeve 1 is formed a confined space 17 by the first sealing 12 and the second sealing 16, and second The centre position of sealing 16 is provided with the first through hole 161 of up/down perforation；Passage 14 communicates with sealed volume 17, the passage of bottom Mouth is preferably provided between the second stop part 15 and the second sealing 16；

The diameter of second sleeve pipe 2 is slightly less than first sleeve 1, and the second sleeve pipe 2 is slidably installed in inside first sleeve 1, the second sleeve pipe 2 top is provided with piston structure 21, and piston structure 21 is slidably installed in inside first sleeve, and piston structure 21 includes piston rod 211, lived Plug 212, the bottom of piston rod 211 is fixedly connected with the top of the second sleeve pipe, during Fig. 6 is shown, by by the top of the second sleeve pipe 2 For enclosed construction, piston rod 211 is fixedly connected with enclosed construction or integral structure, piston rod 211 and and piston 212 are arranged on the top of piston rod 211, and piston 212 is structure as a whole with piston rod 211, and piston rod 211 passes through the second sealing 16 Through hole 161 and stretch out through hole 161, and the size of piston rod 211 is slightly equal with through hole, and sealed volume 17 is divided into by piston 212 Cavity volume 171, lower cavity volume 172, the second sleeve pipe 2 slide up and down, and can be slided up and down with piston 212 in first sleeve 1；

First sleeve 1 and the second sleeve pipe 2 are locked by locking device 3, locking device 3 includes retaining ring 31, locking rotating Button 32, lock sleeve 33, wherein, retaining ring is set between the sleeve pipe 2 of first sleeve 1 and second, and is located at the bottom of first sleeve 1, Second cannula tip position, the top of retaining ring 31 is provided with corresponding oblique with the corresponding matching on the inclined-plane 11 of the inwall of first sleeve 1 Face 311, the inclined surface 311 of retaining ring 31 are fastened at the inclined-plane 11 of first sleeve 1, and first set is stretched out in the bottom of retaining ring 31 Pipe 1, the outer wall convex of the close bottom position of retaining ring 31 are provided with bulge loop 312, and the bottom end of bulge loop 312 dips down ramp-like.

The inner arm of locking knob 32 is provided with internal thread, and locking knob 32 is threaded in the outside of first sleeve 1, locking The bulge loop 312 that the bottom of knob 32 corresponds to retaining ring 31 is arranged with the first annular groove 321 of corresponding matching, so that revolving The bottom of tight knob 32 engages with the bottom of retaining ring 31 so that can promote when screwing locking knob 32 and be moved down in retaining ring 31 Dynamic, the inwall of the close top end of locking knob 32 is also arranged with the second groove 322.

As seen in figs. 5-6, sealing ring 4 is arranged between locking knob 32 and first sleeve 1, and positioned at locking knob 32 Top end, sealing ring 4 are set in first sleeve 1, and the diameter of sealing ring 4 enables sealing ring 4 to be tightly fitted in first On sleeve pipe 1, sealing ring 4 includes ring 41, limiting section 42, and the bottom of annulus 41 is convexly equipped with downwards multiple limiting sections 42, spacing The bottom of portion 42 is similar triangle barb shape, and the upper surface of triangle barb 43 suppresses the second groove of locking knob 32 322 upper surface, triangular barb engaging is arranged in the second groove 322, and the tip portion of locking knob 32 is connected to ring Between 41 and triangle barb 43, the second groove is set corresponding to limiting section 42, and locking knob 32 can be avoided due to power from two It is improper that amount is held, and locking device is easy to back-out downward turn from expansion link and come off, while sealing ring 4 is close is set in the On sleeve 1, then the materials such as the dust, water, sand of outside can be avoided to enter to inside locking device, so as to so as to be made to support Into breakage.

Utility model works principle：First, when adjusting height, locking device is turned to the left first, as shown in fig. 7, the Two sleeve pipes slowly move down in the presence of the drive of piston 212 in sealed volume 17, and the second sleeve pipe 2 will not decline rapidly, Now, target location is reached, as shown in figure 8, locking device 3 is tightened to the right, the second sleeve pipe is fixed in first sleeve；Its It is secondary, when needing to pack up expansion link, reversely pack up, now, by the way that compression relief cock 141 is opened, then lived by original passage plugging It is changed into passage open mode, gas rises to upper cavity volume 171 by lower cavity volume 172 by passage 14, and the pressure of upper and lower cavity volume reaches One balance, then passage 14 is closed, now unscrew locking device 3 again, as the process as shown in Fig. 9 to Figure 10, the second sleeve pipe 2 are slow It is slow then when being down to correct position, then can be locked toward declining by locking device 3, and now gas is compressed into cavity volume 171 It is interior so that pressure is bigger, carries out pressure release to upper cavity volume 142 by compression relief cock 141 so that pressure balance, need to stretch when next time When contracting, principle is the same as above-mentioned.

Embodiment three

As shown in figure 11, the present embodiment uses three-level sleeve structure, wherein, first sleeve 1 as the structure of embodiment two, For second sleeve pipe 2 on the architecture basics of embodiment two, its apical position is additionally provided with the 3rd stop part 22, in the second sleeve pipe 1 The side of side wall is longitudinally provided with second channel 23, and the present embodiment is by taking left side as an example, the passway of the apical position of second channel 23 Between the 3rd stop part 22, and passway, with being communicated inside the second sleeve pipe 2, second channel 23 is opened provided with the second pressure release 231 are closed, the second compression relief cock 231 uses structure identical with the first compression relief cock.

The lower end of second sleeve pipe 2 is provided with the 4th stop part 24, the lower end of the 3rd stop part 22 corresponding to the 3rd stop part 22 Provided with the 3rd sealing 25, the piston 212 on the top of the 3rd sealing 25 and the second sleeve pipe forms closed containing cavity 26, the 3rd sealing The centre position in portion 25 is provided with the second through hole 251；Second channel 23 is communicated with sealed volume 26, and the passway of bottom is preferably provided with Between the 4th stop part 24 and the 3rd sealing 25；

The structure of 3rd sleeve pipe 5 is consistent with the structure of embodiment two, and the top of its 3rd sleeve pipe 3 is provided with second piston structure 51, second piston structure 51 is slidably installed in the second inside pipe casing, and second piston structure 51 includes second piston bar 511, second piston 512, the bottom of second piston bar 512 is fixedly connected with the top of the 3rd sleeve pipe, by the way that the top of the 3rd sleeve pipe 5 is tied for closing Structure, second piston bar 511 is fixedly connected with enclosed construction or integral structure, and second piston 512 is arranged on second The top of piston rod 511, second piston 512 are structure as a whole with second piston bar 511, and second piston bar 511 seals through the 3rd The through hole 251 in portion 25 simultaneously stretches out through hole 251, and sealed volume 26 is divided into upper cavity volume 261, lower cavity volume 262 by second piston 512, the Three sleeve pipes 2 are slided up and down, and second piston 512 can be driven to be slided up and down in the second sleeve pipe 2；

By that analogy, the series of sleeve pipe does not limit, then its structure can also be analogized.

Better embodiment of the present utility model is the foregoing is only, the utility model is not limited to above-mentioned embodiment party Formula, local small structural modification is there may be in implementation process, if various changes or modifications to the utility model are not Depart from spirit and scope of the present utility model, and belong within the scope of the claims and equivalents of the utility model, then originally Utility model is also intended to comprising these changes and modification.

Claims

1. a kind of telescopic rod, including at least two Guan You little toward connecting together successively greatly, the second sleeve pipe is slidably installed in first Inside pipe casing, adjacent two pipes are connected by locking device, and the locking device includes retaining ring, locking knob, described Retaining ring is set between adjacent two pipes, and the locking knob is set in the first sleeve, it is characterised in that：Also include Sealing ring, the sealing ring are fixed and are set between first sleeve and locking knob, the bottom of the annulus of the sealing ring Multiple limiting sections are convexly equipped with downwards, and the limiting section bottom is in barb shape, and the locking knob is arranged with corresponding to limiting section Second groove, the bottom of the limiting section are spacing in the second groove.

A kind of 2. telescopic rod according to claim 1, it is characterised in that：The first sleeve is set close to apical position There is the first sealing, the side of the madial wall of the first sleeve is longitudinally provided with passage, the passage and first sleeve inner chamber phase Logical, the passage is provided with compression relief cock, and the lower end position of the passage is provided with the second sealing, in second sealing Meta installs the through hole of up/down perforation, and the top of second sleeve pipe is provided with piston structure, and the piston structure includes piston With piston rod, the piston is slidably installed on the inwall of first sleeve, and the piston moves in the first sealing with the second sealing Dynamic, the piston rod is through through hole and stretches out through hole.

A kind of 3. telescopic rod according to claim 2, it is characterised in that：It is described to be located at first in first sleeve inwall The lower end position of sealing, first stop part is inwardly convexly equipped with, it is described to be located at the second sealing in first sleeve inwall Upper end position, inwardly it is convexly equipped with second stop part.

A kind of 4. telescopic rod according to claim 2, it is characterised in that：It is described to be located at first in first sleeve inwall The lower end position of sealing, two the first stop parts are inwardly symmetrically convexly equipped with, it is described to be sealed in first sleeve inwall positioned at second The upper end position in portion, inwardly symmetrically it is convexly equipped with two the second stop parts.

A kind of 5. telescopic rod according to claim 2, it is characterised in that：The passway on the passage top is arranged on Between first stop part and the first sealing.

A kind of 6. telescopic rod according to claim 2, it is characterised in that：The passway of the passage bottom is arranged on Between second stop part and the second envelope portion.

A kind of 7. telescopic rod according to claim 1, it is characterised in that：The bottom outer wall of the first sleeve is circumferential Provided with external screw thread, the inside of first sleeve bottom is provided with an inclined-plane, and the top of retaining ring is provided with the inclined-plane with first sleeve inwall Corresponding matching inclined surface, the inclined surface of retaining ring is fastened at the inclined-plane of first sleeve, and the locking knob is corresponding Internal thread is provided with the external screw thread of first sleeve.

A kind of 8. telescopic rod according to claim 1, it is characterised in that：Locking device also includes lock sleeve, described Lock sleeve is set on locking knob, and the outer surface of the lock sleeve is provided with anti-slip tank.

A kind of 9. telescopic rod according to claim 2, it is characterised in that：The expansion link covers pipe sleeve by least three-level Connect and form, be longitudinally provided with second channel in the side of the madial wall of the second sleeve pipe, the second channel communicates with the second sleeve pipe, institute State second channel and be provided with the second compression relief cock, the bottom of second sleeve pipe is provided with the 3rd sealing, the 3rd sealing Through hole provided with up/down perforation, the 3rd cannula tip are provided with second piston structure, and the second piston structure includes second piston With second piston bar, the second piston is slidably installed on the inwall of the second sleeve pipe, and the piston rod is through through hole and stretches out through hole.

A kind of 10. telescopic rod according to claim 9, it is characterised in that：Second sleeve pipe is close to apical position Inwall be inwardly convexly equipped with the 3rd stop part, it is described on the second sleeve pipe on the inwall of the upper end of the 3rd sealing to convex Provided with the 4th stop part.