CN105464578B - Stretchable ladder - Google Patents
Stretchable ladder Download PDFInfo
- Publication number
- CN105464578B CN105464578B CN201610011668.5A CN201610011668A CN105464578B CN 105464578 B CN105464578 B CN 105464578B CN 201610011668 A CN201610011668 A CN 201610011668A CN 105464578 B CN105464578 B CN 105464578B
- Authority
- CN
- China
- Prior art keywords
- ladder
- lock pin
- pin
- locking
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
- E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
- E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/06—Securing devices or hooks for parts of extensible ladders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
The invention discloses a stretchable ladder. A plurality of same-structure ladder units with gradually-changed sizes are sequentially nested in the length direction of the stretchable ladder. In every two adjacent ladder units, ladder legs of an upper ladder frame are sleeved with ladder legs of a lower ladder frame, and then the ladder legs of the upper ladder frame and the ladder legs of the lower ladder frame are detachably connected through locking devices of the same structures; the locking devices comprise locking pins, locking springs, locking pin sleeves, switch buttons, switch springs and switch boxes; the two ends of the locking springs are connected with the two locking pins respectively, the locking pins horizontally and sequentially penetrate through pin holes in the side walls of the upper ladder frames and the side walls of the lower ladder frames and extend out, the switch springs are installed in the switch boxes, and one ends of the switch springs are connected to the outer side walls of the lower ladder frames and arranged on extending parts of the locking pins in a sleeving mode. By means of the stretchable ladder, automatic locking and automatic unlocking can be achieved, and the structure is stable and reliable.
Description
Technical field
The present invention relates to a kind of extension ladder, in particular, provides a kind of safe and reliable with automatic locking, unblock, structure
Extension ladder.
Background technology
Extension ladder major part both domestic and external is, the terraced tuple of decreasing dimensions identical by structure at present, between adjacent ladder unit
Locking system is then combined by spring and steady pin.Stretching and the telescopic ladder period of the day from 11 p.m. to 1 a.m, staff needs manual operations to lock per one-level
Locking apparatus, considerably increase use time, reduce work efficiency.
The content of the invention
The purpose of the present invention is to improve existing extension ladder to be unable to automatic locking, realizes Quick extension and the problem shunk.This
Invention specifically provides a kind of extension ladder, can automatic locking, structure is safe and reliable, can realize ladder quick-expansion, fully saves
Between province, efficiency is improved.
The technical scheme adopted by the invention for realizing the object of the invention is：
Nested multiple structures are identical successively along its length, size gradation terraced unit in extension ladder for the present invention, and each is terraced
The ladder of unit is mainly formed by fixedly connecting with H type structures by the stull between two terraced lower limbs and two terraced lower limbs；It is arbitrary adjacent
In two terraced units, locking system, the terraced lower limb socket of upper ladder between the both sides ladder lower limb of lower ladder and the connection of upper ladder, are equipped with
It is separably attached by structure identical locking system after in the terraced lower limb of lower ladder.
Described locking system is arranged on stull close beneath, and described locking system includes lock pin, locking spring, lock
Shotpin set, shift knob, switch spring and switch enclosure, upper ladder and lower ladder side wall both sides are symmetrically provided with pin-and-hole, upper ladder
Both sides pin-and-hole between equipped with locking guide built with level locking spring, the two ends of locking spring respectively with two lock pins
Connection, the pin-and-hole that lock pin level is sequentially passed through on ladder and lower ladder side wall are stretched out；Lateral wall at lower ladder pin-and-hole sets
There is switch enclosure, built with switch spring, switch spring one end is connected to lower ladder lateral wall and is enclosed within stretching for lock pin switch enclosure
Go out portion, the other end is connected to the shift knob for pressing, and a shift knob part is located in switch enclosure, and another part stretches out switch
Box.
Described switch enclosure outer face is provided with through hole, and shift knob outer end portion stretches out through hole, and shift knob is located at switch
The side face of the inner end portion in box is provided with outward flange, the limited side wall for being stuck in switch enclosure through hole of outward flange side step surface,
Opposite side step surface is connected with switch spring.
Sealing ring is provided between described locking guide and upper ladder side wall, sealing ring extends to direction in the middle part of locking guide
Boss is provided with, boss is located between locking guide and lock pin, and the inner end of lock pin is provided with flange, lock pin flange step surface
Be connected to sealing ring raised head face locking guide flange is caused by sealing ring boss axial limiting；Locking guide is set in the middle part of medial wall
Have for the radially spacing inward flange of switch spring.
Interference fit between the outer wall side face and locking guide inwall of the sealing ring boss, sealing ring inwall side face and lock
Between shotpin, between the flange of lock pin and locking guide inwall side face and lock pin respectively with upper ladder and the pin of lower ladder
Gap cooperation is between hole.
The V-type panel beating of the terraced lower limb top both sides outwardly convex of other all terraced units in addition to uppermost terraced unit
Mouthful, the pin-and-hole on V-type panel beating mouth and terraced lower limb is on same paralleling to the axis.
Between the terraced lower limb of the terraced lower limb of described upper ladder and lower ladder, gap coordinates.
The end surface that stretches out of the lock pin is round end, and other end is tack；The extension ladder in lockup state, institute
The intersection of the round end curved surface and cylinder of stating lock pin is stretched out in outside the wall of lower ladder side.
The inner end portion that the shift knob is located in switch enclosure is the latch structure with blunt end.
, in lockup state, lock pin is through upper ladder ladder lower limb side wall pin hole and descending stair ladder lower limb side wall pin for the extension ladder
Hole, lock pin, upper ladder side wall pin hole, lower ladder side wall pin hole, lockup switch spring and shift knob are coaxial.
Compared with background technology, beneficial effects of the present invention：
1st, the present invention is simple to operation, can realize the function of automatic locking and unblock, Quick extension and contraction.At this
In invention, staff need to only lift certain ladder component, locking system automatic locking, you can realize Quick extension；Staff
Shift knob need to be only pressed, locking system can realize rapid desufflation according to level automatic unlocking.Can save
The trouble put, it is time-consuming, improve efficiency.
2nd, locking system structure of the present invention is safe and reliable.Using lock pin+locking spring+locking guide+gasket set
Realize that the V-type projection panel beating mouth of Bidirectional locking, lower ladder and upper ladder ladder lower limb top can stretch out ladder table lock pin is guaranteed
Remain to realize automatic unlocking function when the relatively long distance of face, whole device structure is safe and reliable.
Description of the drawings
Fig. 1 is the extended configuration structure diagram of the present invention；
Fig. 2 is the extended configuration CONSTRUCTED SPECIFICATION figure of the present invention；
Fig. 3 is the contraction state structure diagram of the present invention；
Fig. 4 is the contraction state mechanical details figure of the present invention.
In figure：1st, lower ladder, 2, upper ladder, 3, lock pin, 4, locking spring, 5, locking guide, 6, sealing ring, 7, switch
Button, 8, switch spring, 9, switch enclosure.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in figures 1 and 3, nested multiple structures are identical successively along its length, size gradation in extension ladder for the present invention
Terraced unit, the ladder of each terraced unit mainly fixed with H types structure by the stull between two terraced lower limbs and two terraced lower limbs and connected
Connect and form；In arbitrary two neighboring terraced unit, between the both sides ladder lower limb of lower ladder 1 and the connection of upper ladder 2, locking system is equipped with,
It is separably attached that the terraced lower limb of upper ladder 2 passes through structure identical locking system in being socketed in the terraced lower limb of lower ladder 1 afterwards.
As shown in Figure 2 and Figure 4, locking system be arranged on stull close beneath, described locking system include lock pin 3,
Locking spring 4, locking guide 5, shift knob 7, switch spring 8 and switch enclosure 9, upper ladder 2 and 1 side wall both sides of lower ladder it is right
Title is provided with pin-and-hole, and locking spring 4 of the locking guide 5 built with level, locking spring 4 are housed between the both sides pin-and-hole of upper ladder 2
Two ends be connected with two lock pins 3 respectively, the pin-and-hole that 3 level of lock pin is sequentially passed through on 1 side wall of ladder 2 and lower ladder is stretched
Go out；Lateral wall at lower 1 pin-and-hole of ladder is provided with switch enclosure 9, and switch enclosure 9 is built with switch spring 8, the connection of 8 one end of switch spring
To 1 lateral wall of lower ladder and the extension of lock pin 3 is enclosed within, the other end is connected to the shift knob 7 for pressing, shift knob 7
A part is located in switch enclosure 9, and another part stretches out switch enclosure 9.
9 outer face of switch enclosure is provided with through hole, and 7 outer end portion of shift knob stretches out through hole, and shift knob 7 is located at switch enclosure 9
The side face of interior inner end portion is provided with outward flange, the limited side wall for being stuck in 9 through hole of switch enclosure of outward flange side step surface, separately
Side step surface is connected with switch spring 8, and outward flange structure ensures shift knob 7 in 9 internal motion of switch enclosure, switch spring 8
Shift knob 7 can be made to reset.
Sealing ring 6 is provided between 2 side wall of locking guide 5 and upper ladder, sealing ring 6 extends to 5 middle part direction of locking guide
Boss is provided with, boss is located between locking guide 5 and lock pin 3, and the inner end of lock pin 3 is provided with flange, 3 flange platform of lock pin
Terrace is connected to 6 raised head face of sealing ring and causes 5 flange of locking guide by 6 boss axial limiting of sealing ring；On the inside of locking guide 5
It is provided with the middle part of wall for 8 radially spacing inward flange of switch spring, while 5 inward flange of locking guide limits monosymmetric locking
3 axial movement position of pin, it is ensured that when two 3 stress of lock pin are uneven symmetrical, remain to be retracted in locking guide 5.
Between the terraced lower limb of the terraced lower limb of upper ladder 2 and lower ladder 1, gap coordinates, it is ensured that can be along terraced lower limb side between ladder during contraction
To moving freely.Interference fit between 5 inwall of outer wall side face and locking guide of 6 boss of sealing ring, 6 inwall side face of sealing ring with
Between lock pin 3, between 5 inwall side face of the flange of lock pin 3 and locking guide and lock pin 3 respectively with upper ladder 2 and under
Be between the pin-and-hole of ladder 1 gap cooperation so that lock pin 3 can vertically locking guide 5, sealing ring 6, on ladder 2
Move freely and between the pin-and-hole of lower ladder 1, it is ensured that the motility of locking system, realize automatic locking and unlocking function.
The V-type panel beating of the terraced lower limb top both sides outwardly convex of other all terraced units in addition to uppermost terraced unit
Mouthful, V-type panel beating mouth is vertically corresponding with pin-and-hole, and with terraced lower limb on pin-and-hole on same paralleling to the axis.When ladder shrinks, V-type
Panel beating mouth is moved to and is stretched out at the lock pin 3 of ladder, and 3 round end curved surface of lock pin is along on the inside of V-type panel beating mouth towards on the inside of ladder
Shrink, realize automatic unlocking.
The end surface that stretches out of lock pin 3 is round end, and other end is tack；The extension ladder is in lockup state, described
The round end curved surface of lock pin 3 is stretched out in outside 1 side wall of lower ladder with the intersection of cylinder, and its extension length can improve extension ladder
The reliability of latch functions.The inner end portion that shift knob 7 is located in switch enclosure 9 is the latch structure with blunt end.
Extension ladder in lockup state, at the locking system be made up of lock pin, locking spring, locking guide and sealing ring
In lockup state, lock pin 3 is through 1 terraced lower limb side wall pin hole of 2 terraced lower limb side wall pin hole of upper ladder and lower ladder, lock pin 3, upper ladder
2 side wall pin holes, 1 side wall pin hole of lower ladder, lockup switch spring 7 and shift knob 7 are coaxial.
The present invention stretching, extension principle and process be：
When extension ladder needs to stretch in contraction state, the lower ladder of fixed lowermost end lifts certain ladder of upper end, ladder
Frame drives locking pin assembly to move up, and when lock pin reaches the pin-and-hole of ladder ladder lower limb upper end, locking spring stretches automatically, pushes away
Dynamic lock pin passes through pin-and-hole, realizes stretching locking.By that analogy, lock pin between the ladder being raised and lowermost end ladder
Automatic locking, realizes that extension ladder stretches, finally as depicted in figs. 1 and 2.
The present invention contraction principle and process be：
When extension ladder needs to shrink in extended configuration, need simultaneously to press and be fixed on opening for both sides on descending stair ladder lower limb
Button is closed, compression lock pin is moved to terraced inboard leg, locking spring-compressed.When lock pin round end curved surface and the intersection of Cylinder Surface
When place begins lower than descending stair ladder lower limb inner surface, lock pin and upper ladder can start to move down；In folding process, descending stair ladder
Lower limb inner surface extrudes lock pin, lock pin extruding locking spring to inner side along lock pin round end curved surface.When the round end of lock pin
When curved surface is less than descending stair ladder lower limb inner surface, upper ladder and its upper module can be moved down jointly, be shunk.
When the lock pin hole portion position of upper ladder ladder lower limb upper end is displaced downwardly to descending stair ladder lower limb top, descending stair ladder lower limb top is convex
The V-type panel beating mouth inner surface for rising extrudes lock pin to terraced inboard leg along the round end curved surface of lock pin, when lock pin round end curved surface
During with upper ladder ladder lower limb inner surface is begun lower than at the intersection of Cylinder Surface, upper ladder ladder lower limb wall continues to ladder along round end curved surface
Inboard leg is extruded；When the round end curved surface of lock pin is less than upper ladder ladder lower limb inner surface, upper end ladder unit can be moved down jointly,
Shunk.
By that analogy, device for upper end can be unlocked according to the method for above-mentioned unblock successively, realize ladder contractile function,
Finally as shown in Figure 3 and Figure 4.
Claims (9)
1. a kind of extension ladder, it is characterised in that：In extension ladder, nested multiple structures are identical, size gradation successively along its length
Terraced unit, the ladder of each terraced unit are mainly fixedly connected with H type structures by the stull between two terraced lower limbs and two terraced lower limbs
Form；In arbitrary two neighboring terraced unit, between the both sides ladder lower limb that lower ladder (1) and upper ladder (2) connect, locking dress is equipped with
Put, the terraced lower limb of upper ladder (2) is separably connected by structure identical locking system in being socketed in the terraced lower limb of lower ladder (1) afterwards
Connect；
Described locking system be arranged on stull close beneath, described locking system include lock pin (3), locking spring (4),
Locking guide (5), shift knob (7), switch spring (8) and switch enclosure (9), upper ladder (2) and lower ladder (1) side wall both sides it is equal
Pin-and-hole is symmetrically provided with, is locked built with the locking spring (4) of level equipped with locking guide (5) between the both sides pin-and-hole of upper ladder (2)
Only the two ends of spring (4) are connected with two lock pins (3) respectively, and lock pin (3) level sequentially passes through ladder (2) and lower ladder
(1) pin-and-hole on the wall of side stretches out；Lateral wall at lower ladder (1) pin-and-hole is provided with switch enclosure (9), and switch enclosure (9) is built with switch
Spring (8), switch spring (8) one end are connected to lower ladder (1) lateral wall and are enclosed within the extension of lock pin (3), and the other end connects
The shift knob (7) for pressing is connect, shift knob (7) part is located in switch enclosure (9), and another part stretches out switch enclosure
(9)。
2. a kind of extension ladder according to claim 1, it is characterised in that：Described switch enclosure (9) outer face is provided with through hole,
Shift knob (7) outer end portion stretches out through hole, and the side face of inner end portion of the shift knob (7) in switch enclosure (9) is provided with outer
Flange, the limited side wall for being stuck in switch enclosure (9) through hole of outward flange side step surface, opposite side step surface and switch spring
(8) connect.
3. a kind of extension ladder according to claim 1, it is characterised in that：Described locking guide (5) and upper ladder (2) side
Sealing ring (6) is provided between wall, sealing ring (6) is provided with boss to direction extension in the middle part of locking guide (5), and boss is located at lock pin
Between set (5) and lock pin (3), the inner end of lock pin (3) is provided with flange, and lock pin (3) flange step surface is connected to sealing
Circle (6) raised head face causes locking guide (5) flange by sealing ring (6) boss axial limiting；In the middle part of locking guide (5) medial wall
It is provided with for the radially spacing inward flange of switch spring (8).
4. a kind of extension ladder according to claim 3, it is characterised in that：The outer wall side face of sealing ring (6) boss with
Interference fit between locking guide (5) inwall, between sealing ring (6) inwall side face and lock pin (3), the flange of lock pin (3)
Between locking guide (5) inwall side face and lock pin (3) respectively between the pin-and-hole of upper ladder (2) and lower ladder (1)
Coordinate for gap.
5. a kind of extension ladder according to claim 1, it is characterised in that：Other all ladders in addition to uppermost terraced unit
The V-type panel beating mouth of the terraced lower limb top both sides outwardly convex of unit, the pin-and-hole on V-type panel beating mouth and terraced lower limb is in same parallel axes
On line.
6. a kind of extension ladder according to claim 1, it is characterised in that：The terraced lower limb of described upper ladder (2) and lower ladder
(1) between terraced lower limb, gap coordinates.
7. a kind of extension ladder according to claim 1, it is characterised in that：The end surface that stretches out of the lock pin (3) is circle
Head, other end are tack；The extension ladder in lockup state, the round end curved surface of the lock pin (3) and the intersection of cylinder
Stretch out in outside the wall of lower ladder (1) side.
8. a kind of extension ladder according to claim 1, it is characterised in that：The shift knob (7) is in switch enclosure (9)
Inner end portion be the latch structure with blunt end.
9. a kind of extension ladder according to claim 1, it is characterised in that：The extension ladder in lockup state, lock pin
(3) through upper ladder (2) ladder lower limb side wall pin hole and lower ladder (1) ladder lower limb side wall pin hole, lock pin (3), upper ladder (2) side wall pin
Hole, lower ladder (1) side wall pin hole, lockup switch spring (8) and shift knob (7) are coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610011668.5A CN105464578B (en) | 2016-01-08 | 2016-01-08 | Stretchable ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610011668.5A CN105464578B (en) | 2016-01-08 | 2016-01-08 | Stretchable ladder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105464578A CN105464578A (en) | 2016-04-06 |
| CN105464578B true CN105464578B (en) | 2017-04-12 |
Family
ID=55602687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610011668.5A Expired - Fee Related CN105464578B (en) | 2016-01-08 | 2016-01-08 | Stretchable ladder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105464578B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184543A (en) * | 2018-10-18 | 2019-01-11 | 国网山东省电力公司烟台供电公司 | A kind of pruning trees dedicated extension ladder |
| CN111809725B (en) * | 2020-08-17 | 2021-06-25 | 陈琇 | Building water-saving basement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2336187A1 (en) * | 1973-07-16 | 1975-02-13 | Alfred Voetsch | One or two sided ladder - has pairs of telescoping stringers locked in position and connected by spars |
| JPH10331559A (en) * | 1997-04-05 | 1998-12-15 | Nakao:Kk | Device for locking telescopic leg |
| CN201254945Y (en) * | 2008-05-05 | 2009-06-10 | 刘丰铭 | Portable ladder |
| CN201874438U (en) * | 2010-11-10 | 2011-06-22 | 金勇� | Telescopic stepladder |
| CN202348099U (en) * | 2011-10-26 | 2012-07-25 | 陈肖玲 | Extending ladder |
| CN205349214U (en) * | 2016-01-08 | 2016-06-29 | 浙江大学 | Telescopic ladder |
-
2016
- 2016-01-08 CN CN201610011668.5A patent/CN105464578B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2336187A1 (en) * | 1973-07-16 | 1975-02-13 | Alfred Voetsch | One or two sided ladder - has pairs of telescoping stringers locked in position and connected by spars |
| JPH10331559A (en) * | 1997-04-05 | 1998-12-15 | Nakao:Kk | Device for locking telescopic leg |
| CN201254945Y (en) * | 2008-05-05 | 2009-06-10 | 刘丰铭 | Portable ladder |
| CN201874438U (en) * | 2010-11-10 | 2011-06-22 | 金勇� | Telescopic stepladder |
| CN202348099U (en) * | 2011-10-26 | 2012-07-25 | 陈肖玲 | Extending ladder |
| CN205349214U (en) * | 2016-01-08 | 2016-06-29 | 浙江大学 | Telescopic ladder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105464578A (en) | 2016-04-06 |
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Granted publication date: 20170412 Termination date: 20200108 |