CN206429184U

CN206429184U - A kind of extension ladder

Info

Publication number: CN206429184U
Application number: CN201720048670.XU
Authority: CN
Inventors: 潘跃进
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-01-10
Filing date: 2017-01-10
Publication date: 2017-08-22
Anticipated expiration: 2027-01-10

Abstract

A kind of extension ladder, including symmetrical two longitudinally disposed cleat stanchions and some steps laterally set, each cleat stanchion all descending pipes are socketed to form, step is set between the two tubes upper end of identical bore, first step in ladder bottom is arranged below the instep operated with instep and shrinks switch, instep shrinks switch and includes action bars, operation rubber cushion is fixed with action bars, the lower end in contact of the two ends of action bars respectively with a drive link, the end thereof contacts of the upper end of drive link then with the plug-in switch of second step, the other end of plug-in switch is then hinged on the middle part of latch by a round pin, the positioning hole of the front end of latch two cleat stanchions corresponding with second step coordinates, the rear end of latch is contacted on back-moving spring, back-moving spring is located in plug housing, plug housing is fixed in second step.The utility model provides a kind of extension ladder for being prevented effectively from and the potential safety hazard brought being operated with hand, security performance is lifted.

Description

A kind of extension ladder

Technical field

The utility model is related to ladder, especially a kind of extension ladder.

Background technology

Extension ladder be it is a kind of it is extensible use, the necessity of the operation of climbing of collapsible storage, stretching in current techniques Contracting ladder, it shrinks each one of the left and right ends that switch is arranged on second step in ladder bottom mostly, when switch is shunk in operation, The person's of needing to use bending, or even body of squatting down go operation, it is easy to cause because user helps the position of ladder is too low to cause Ladder is toppled over, and gently then damages ladder, heavy then injure oneself and other people；Moreover, extension ladder in the prior art shrinks at present Quickly, when shrinking switch with hand operation, the hand of user is easy to dodge not as good as and injured by a crashing object because keeping away reduction of speed degree.Therefore it is existing to stretch The terraced technology of contracting, can also be improved further.

The content of the invention

There is potential safety hazard, the utility model to shrink switch with hand operation when overcoming the shortcomings of that existing extension ladder is used A kind of extension ladder for being prevented effectively from and the potential safety hazard brought being operated with hand, security performance is lifted is provided.

The utility model solves the technical scheme that its technical problem used：

A kind of extension ladder, including symmetrical two longitudinally disposed cleat stanchions and some steps laterally set, Each cleat stanchion is all socketed to form by descending pipe, and the step is set between the two tubes upper end of identical bore, First step in ladder bottom is arranged below the instep operated with instep and shrinks switch, and the instep shrinks switch and included It is fixed with operation rubber cushion on action bars, the action bars, the lower end in contact of the two ends of the action bars respectively with a drive link, institute The end thereof contacts of the upper end of drive link then with the plug-in switch of second step are stated, the other end of the plug-in switch then passes through one Branch round pin is hinged on the middle part of latch, and the positioning hole of the front end of the latch two cleat stanchions corresponding with second step coordinates, The rear end of the latch is contacted on back-moving spring, and the back-moving spring is located in plug housing, and the plug housing is fixed on second In root step.

Further, the extension ladder also includes anti-misoperation insurance institution, and the anti-misoperation insurance institution includes protecting Dangerous block, fixes the safety block on the action bars, and discharge cock is set in the outside of step, provided with solid in the step Sliding block, relief spring, catch and torque spring are provided with fixed safety box, the safety box, wherein discharge cock joins with sliding block Dynamic, one end of the sliding block is contacted on relief spring, and the other end of the relief spring is fixed in safety box, the sliding block The other end and catch coordinate, the catch is installed in rotation on the fulcrum in safety box, and torsion is installed on the fulcrum Spring, the safety box at the sliding block and catch cooperation is provided with the hole stretched into for safety block；When unblock is not carried out, action bars On the hole that is opened up by step bottom surface of safety block contradict on sliding block；When implementing unblock, discharge cock band movable slider is acted, gear Piece is rotated by the torsion of torque spring immediately, so that propping up sliding block can not back move, action bars drives safety block to transport upwards It is dynamic to promote catch to rotate.

Further, the extension ladder also includes misoperation-proof mechanism, and the misoperation-proof mechanism includes support, described Action bars includes the left action bars being connected with left side cleat stanchion and the right action bars being connected with right side cleat stanchion, the left action bars and the right side Operation rubber cushion is respectively mounted on action bars, right-hand member and the support bottom left end of the left action bars are hinged, the right operation The left end of bar is hinged with support bottom right-hand member, and the top of the support is fixed on step.

Further, the ladder also includes slow descending mechanism, and the slow descending mechanism, institute are set between adjacent cleat stanchion pipe Stating slow descending mechanism includes a upper seal disc being located in pipe, and the upper seal disc is connected with the pipe sealing；Adjacent Lower seal disc is provided with the pipe of lower section, the lower seal disc is connected with adjacent lower section pipe sealing, is provided with the lower seal disc Bleeder port.

The bleeder port includes the breach of the aperture of lower seal disc bottom surface and the side of lower seal disc.

The periphery of the upper seal disc has that a circle is relatively thin, tapered inclined-plane, the upper end chi on the inclined-plane from top to bottom The very little inside dimension more than or equal to pipe, the inwall of the upper seal disc and pipe is brought into close contact；In the lower end of each tube by end The position in face is being radially provided with the inwardly protruded limited step of a circle；The periphery of the lower seal disc equally have a circle it is relatively thin, In the face of cylinder or the inclined-plane of taper, the size on the face of cylinder or inclined-plane is more than or equal to the interior chi of the adjacent larger pipe in bottom Very little, the inwall of the lower seal disc and the larger pipe is brought into close contact.

Provided with a terminal pad between upper seal disc and lower seal disc, the upper seal disc is provided with locating rod, described Terminal pad is provided with the positioning through hole passed through for the locating rod, and the lower seal disc is provided with for determining that the locating rod is inserted Position blind hole.

Technical concept of the present utility model is：The extension ladder for shrinking switch is operated with instep, because operating contraction with instep While switch, both hands can be vacateed and helped in the higher position of ladder, the center of gravity of ladder can be stably held on very much, significantly keep away Exempt from user's bending or body of squatting down is gone to operate when shrinking switch with hand, because helping the position of ladder is too low to cause ladder to be toppled over Potential safety hazard；And further providing for one kind can make ladder contraction decrease speed become slowly to delay drop technology, make the peace of ladder Full property further gets a promotion.

The beneficial effects of the utility model are mainly manifested in：It is prevented effectively from and the potential safety hazard brought, lifting peace is operated with hand Quan Xing.

Brief description of the drawings

Fig. 1 is the contraction state of extension ladder and the mode of appearance figure of extended configuration, and (a) is contraction state, and (b) is stretch-like State；

Fig. 2 is that instep operates the structure sectional view for shrinking switch；

Fig. 3 is that instep operates the structure for shrinking and switching and anti-misoperation insurance institution being added derived from the basis of Fig. 2 Sectional view；

Fig. 4 is Fig. 3 partial enlarged drawing, and (a), for released state is not carried out, (b) is the state after implementation unblock；(c) it is The state of the telescopic ladder period of the day from 11 p.m. to 1 a.m.

Fig. 5 is that instep operates the structural representation for shrinking and switching and having anti-misoperation to design derived from the basis of Fig. 2；

Fig. 6 is the Structure explosion diagram of slow descending mechanism；

Fig. 7 is the status architecture sectional view in the contraction process of slow descending mechanism；

Fig. 8 is partial enlarged drawing at Fig. 7 A.

Embodiment

The utility model is further described below in conjunction with the accompanying drawings.

1~Fig. 8 of reference picture, a kind of extension ladder, including symmetrical two longitudinally disposed cleat stanchions and some horizontal strokes To the step of setting, each cleat stanchion is all socketed to form by descending pipe, between the two tubes upper end of identical bore The step is set, and first step in ladder bottom is arranged below the instep operated with instep and shrinks switch, the instep Contraction switch, which includes, is fixed with operation rubber cushion on action bars, the action bars, the two ends of the action bars are respectively driven with one The lower end in contact of bar, the end thereof contacts of the upper end of the drive link then with the plug-in switch of second step, the plug-in switch The other end middle part of latch, the front end of the latch two ladders corresponding with second step are then hinged on by a round pin The positioning hole of post coordinates, and the rear end of the latch is contacted on back-moving spring, and the back-moving spring is located in plug housing, described to insert Key seat is fixed in second step.

The contraction state of the extension ladder of the present embodiment and the grown form figure of extended configuration are as illustrated, right including left and right The two longitudinally disposed cleat stanchions 1 claimed, some horizontal steps 2 set, if every cleat stanchion 1 is all by the descending pipe of the Heavenly Stems and Earthly Branches (n) is socketed to form for sub 1 (1)~1；It is the conventional structure of extension ladder above.

Referring to Fig. 2, it is that the structure sectional view of switch is shunk in the instep operation of the utility model embodiment, is included under ladder Provided with an action bars 3 below the step 2 (1) in portion, an operation foot pad 4, action bars 3 are fixedly arranged in the middle of in action bars 3 Two ends and the lower end in contact of drive link 5 that is located in cleat stanchion 1 (1), the upper end of drive link 5 and the plug-in switch 6 of step 2 (2) Lower end in contact, while outer surface of the lower end of the plug-in switch 6 also with cleat stanchion 1 (1) is contacted, the upper end of plug-in switch 6 then leads to Round pin 7 is crossed to be hinged with latch 8, when user with instep by operate rubber cushion 4 carry upwards, action bars 3 simultaneously drive drive link 5 make to Upper motion, the upper end of drive link 5 is by the plug-in switch 6 of second step 2 (2) of top pressure, the latch 8 being hinged with plug-in switch 6 Exit immediately to its end motion provided with spring 9 and from the positioning hole 10 on cleat stanchion 1 (2), step 2 (3) and its associated Cleat stanchion 1 (2) then immediately shrink fall.When these actions complete and removed the action that upwards proposes of the instep in operation rubber cushion 4 Afterwards, because being provided with spring 11 in drive link 5, one end of spring 11 is contradicted on drive link 5, and the other end, which is then contradicted, is being fixed on ladder On the spring fastening 12 of post 1 (2), after instep is removed in the action carried upwards of operation rubber cushion 4, drive link 5 will be by bullet The pressure of spring 11 makes drive link 3 fall reset after rise, that is, completes the action for once shrinking ladder.

Referring to Fig. 3 and Fig. 4, be on the architecture basics described in the utility model embodiment Fig. 2 it is derivative add it is anti-error Insurance institution is operated, its embodiment is that safety block 13 is secured on action bars 3, is added outside step 2 (1) Discharge cock 14, in the inside of step 2 (1) provided with fixed safety box 15, safety box 15 is interior provided with sliding block 16, spring 17, gear Piece 18, torque spring 19, wherein discharge cock 14 are connected with sliding block 16 by screw 20；Referring to Fig. 4 (a), unblock is being not carried out When, the hole 21 that the safety block 13 on action bars 3 is opened up by step bottom surface is contradicted on sliding block 16, and now, action bars 3 can not be made Motion upwards；Referring to Fig. 4 (b), when ladder is relied on wall after, first such as direction of arrow 1 of discharge cock 14 is pulled out, together When band movable slider 16 such as the direction of arrow 2 move, catch 18 immediately by torque spring 19 torsion such as the direction of arrow 3 rotation, from And prop up sliding block 16 and can not back move, now, no sliding block 16 is kept out, and action bars 3 can move upwards；Referring to Fig. 4 (c) direction for, now, making such as arrow 4 of action bars 3 with instep is moved, and ladder completes the ladder contractive action described in Fig. 2 immediately； Meanwhile, the safety block 13 being fixed on action bars 3 then rotates such as direction of arrow 5 of catch 18, and now, sliding block 16 is without catch 18 keep out, and sliding block 16 is rapid such as the motion of arrow 6 direction by the effect of spring 17 immediately, and Fig. 4 (a) state is reset into again, Complete the action for once shrinking ladder.

It is the derivative misoperation-proof mechanism on the architecture basics described in the utility model embodiment Fig. 2 referring to Fig. 5, its It by 3 points of an action bars described in embodiment Fig. 2 is two that embodiment, which is, --- action bars 3 (1) and action bars 3 (2) support 21, is fixed with step 2 (1), action bars 3 (1) and action bars 3 (2) are arranged on support by one end of ladder center line On 21, it is possible to rotate, operation rubber cushion 4 (1) and operation are fixed with by one end of cleat stanchion 1 in action bars 3 (1) and action bars 3 (2) Rubber cushion 4 (2), when ladder needs to shrink, with instep is in operation rubber cushion 4 (1) and operates rubber cushion 4 (2) is each to carry once upwards, that is, is completed Once shrink the action of ladder.

It is the sectional view of the slow descending mechanism structure of the utility model embodiment referring to Fig. 6~Fig. 8, the slow descending mechanism is installed It is each a set of in the bottom of each tube 1 (2)~1 (n) of socket composition cleat stanchion, including a upper sealing being located in pipe bottom Disk 22, the periphery of upper seal disc 22 has that a circle is relatively thin, tapered inclined-plane from top to bottom, the upper end size d1 on the inclined-plane with The inside dimension D1 of pipe is identical or bigger, can be brought into close contact with the inwall of pipe；The position of end face is leaned in the bottom of pipe in footpath To provided with an inwardly protruded limited step 23 of circle；Upper seal disc 22 loads from the upper end of pipe, when the lower end of upper seal disc 22 Stop when being resisted against on limited step 23, lower seal disc 24 be externally provided with pipe, the periphery of lower seal disc 24 equally have a circle compared with Inclined-plane thin, in the face of cylinder or taper, the size d2 on the face of cylinder or inclined-plane is interior with the larger pipe that is connected in pipe Dimension D 2 is identical or bigger, can be brought into close contact with the inwall of the larger pipe；Between upper seal disc 22 and lower seal disc 24 Provided with a terminal pad 25；Lower seal disc 24, terminal pad 25 and upper seal disc 22 are connected and fixed to every by screw 26 The lower end of pipe.Because upper seal disc 22 is brought into close contact with the inwall of less pipe in being connected, and lower seal disc is with being connected In larger tube wall be brought into close contact, so ladder shrink decline when, by compress the air between two tubes from Aperture 27 and breach 28 in lower seal disc are slowly discharged, so as to reach the effect that ladder slowly declines.

Claims

1. a kind of extension ladder, including symmetrical two longitudinally disposed cleat stanchions and some steps laterally set, often A piece cleat stanchion is all socketed to form by descending pipe, and the step is set between the two tubes upper end of identical bore, its It is characterised by：First step in ladder bottom is arranged below the instep operated with instep and shrinks switch, and the instep shrinks Switch includes operation rubber cushion is fixed with action bars, the action bars, the two ends of the action bars respectively with drive link Lower end in contact, the end thereof contacts of the upper end of the drive link then with the plug-in switch of second step, the plug-in switch it is another One end is then hinged on the middle part of latch by a round pin, the front end of the latch two cleat stanchions corresponding with second step Positioning hole coordinates, and the rear end of the latch is contacted on back-moving spring, and the back-moving spring is located in plug housing, the plug housing It is fixed in second step.

2. a kind of extension ladder as claimed in claim 1, it is characterised in that：The extension ladder also includes anti-misoperation and insured Mechanism, the anti-misoperation insurance institution includes safety block, the safety block is fixed on the action bars, in the outside of step Discharge cock is set, provided with fixed safety box in the step, sliding block, relief spring, catch are provided with the safety box And torque spring, wherein discharge cock and sliding block linked, and one end of the sliding block is contacted on relief spring, the relief spring The other end be fixed in safety box, the other end of the sliding block coordinates with catch, and the catch is installed in rotation on insurance On fulcrum in box, torque spring is installed on the fulcrum, the safety box at the sliding block and catch cooperation is provided with for insurance The hole that block is stretched into；When unblock is not carried out, the hole that the safety block on action bars is opened up by step bottom surface is contradicted on sliding block；It is real When applying unblock, discharge cock band movable slider is acted, and catch is rotated by the torsion of torque spring immediately, can not so as to prop up sliding block Back move, action bars drives the upward movement progress catch of safety block to rotate.

3. a kind of extension ladder as claimed in claim 1, it is characterised in that：The extension ladder also includes anti-misoperation machine Structure, the misoperation-proof mechanism includes support, and the action bars includes the left action bars being connected with left side cleat stanchion and terraced with right side Operation rubber cushion, the right-hand member of the left action bars are respectively mounted on the right action bars of post connection, the left action bars and right action bars Be hinged with support bottom left end, left end and the support bottom right-hand member of the right action bars are hinged, the support it is upper Portion is fixed on step.

4. a kind of extension ladder as described in one of claims 1 to 3, it is characterised in that：The ladder also includes slow descending mechanism, The slow descending mechanism is set between adjacent cleat stanchion pipe, and the slow descending mechanism includes a upper seal disc being located in pipe, The upper seal disc is connected with the pipe sealing；Lower seal disc, the lower seal disc and phase are provided with adjacent lower section pipe Bleeder port is provided with adjacent lower section pipe sealing connection, the lower seal disc.

5. a kind of extension ladder as claimed in claim 4, it is characterised in that：The bleeder port includes the small of lower seal disc bottom surface Hole and the breach of the side of lower seal disc.

6. a kind of extension ladder as claimed in claim 4, it is characterised in that：The periphery of the upper seal disc has a circle relatively thin , tapered inclined-plane from top to bottom, the upper end size on the inclined-plane is more than or equal to the inside dimension of pipe, the upper seal disc with The inwall of pipe is brought into close contact；In the lower end of each tube the inwardly protruded limiting stand of a circle is being radially provided with by the position of end face Rank；The periphery of the lower seal disc equally has that a circle is relatively thin, inclined-plane in the face of cylinder or taper, the face of cylinder or inclined-plane Size is more than or equal to the inside dimension of the adjacent larger pipe in bottom, and the inwall of the lower seal disc and the larger pipe is closely pasted Close.

7. a kind of extension ladder as claimed in claim 4, it is characterised in that：One is provided between upper seal disc and lower seal disc Individual terminal pad, the upper seal disc is provided with locating rod, and the terminal pad is provided with the positioning through hole passed through for the locating rod, The lower seal disc is provided with the Blind locating holes inserted for the locating rod.