CN105464578A - Stretchable ladder - Google Patents
Stretchable ladder Download PDFInfo
- Publication number
- CN105464578A CN105464578A CN201610011668.5A CN201610011668A CN105464578A CN 105464578 A CN105464578 A CN 105464578A CN 201610011668 A CN201610011668 A CN 201610011668A CN 105464578 A CN105464578 A CN 105464578A
- Authority
- CN
- China
- Prior art keywords
- ladder
- locking
- pin
- lock pin
- 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.)
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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, provide one and there is automatic locking, unblock, the reliable extension ladder of structural safety.
Background technology
Current extension ladder major part both domestic and external is identical by structure, the terraced tuple of decreasing dimensions, and the locking system between adjacent terraced unit is then combined by spring and steady pin.At stretching, extension and the telescopic ladder period of the day from 11 p.m. to 1 a.m, staff needs the every one-level locking system of manual operations, considerably increases service time, reduces operating efficiency.
Summary of the invention
The object of the invention is to improve existing extension ladder can not automatic locking, realizes the problem of Quick extension and contraction.Invention especially provides a kind of extension ladder, can automatic locking, structural safety is reliable, can realize ladder quick-expansion, between fully saving, raises the efficiency.
The present invention realizes the technical scheme that its goal of the invention adopts:
The present invention is at the terraced unit of extension ladder identical, the size gradation of nested multiple structure successively along its length, and the ladder of each terraced unit is formed by fixedly connecting with H type structure primarily of the stull between two terraced legs and two terraced legs; In arbitrary adjacent two terraced unit, be equipped with locking system between the both sides ladder leg that lower ladder and upper ladder connect, the terraced leg of upper ladder is socketed in after in the terraced leg of lower ladder and is connected separably by the locking system that structure is identical.
Described locking system is arranged on stull close beneath, described locking system comprises lock pin, locking spring, locking guide, shift knob, switch spring and switch enclosure, the equal symmetry of upper ladder and lower ladder sidewall both sides has pin-and-hole, the locking spring of locking guide built with level is housed between the both sides pin-and-hole of upper ladder, the two ends of locking spring are connected with two lock pins respectively, and lock pin level is stretched out through the pin-and-hole on upper ladder and lower ladder sidewall successively; The lateral wall at lower ladder pin-and-hole place is provided with switch enclosure, switch enclosure is built with switch spring, and switch spring one end is connected to lower ladder lateral wall and is enclosed within the extension of lock pin, and the other end connects the shift knob for pressing, a shift knob part is positioned at switch enclosure, and another part stretches out switch enclosure.
Described switch enclosure outer face has through hole, shift knob outer end portion stretches out through hole, the side face that shift knob is positioned at the inner end portion of switch enclosure is provided with outward flange, and the limited sidewall 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 with between described locking guide and upper ladder sidewall, sealing ring extends to direction in the middle part of locking guide and is provided with boss, boss is between locking guide and lock pin, the inner end of lock pin is provided with flange, and lock pin flange step surface is connected to sealing ring raised head face and makes locking guide flange by sealing ring boss axial limiting; Be provided with in the middle part of locking guide inside wall for the radial spacing inward flange of switch spring.
Interference fit between the outer wall side face of described sealing ring boss and locking guide inwall, between sealing ring inwall side face and lock pin, between the flange of lock pin and locking guide inwall side face and lock pin be matched in clearance respectively and between the pin-and-hole of upper ladder and lower ladder.
Except uppermost terraced unit, all there is the V-type panel beating mouth of outwardly convex the both sides, terraced leg top of other all terraced unit, and the pin-and-hole on V-type panel beating mouth and terraced leg is on same paralleling to the axis.
Matched in clearance between the terraced leg of described upper ladder and the terraced leg of lower ladder.
The extension end face of described lock pin is round end, and other end is tack; Described extension ladder is when lockup state, and the round end curved surface of described lock pin and the intersection of cylinder stretch out in outside lower ladder sidewall.
The inner end portion that described shift knob is positioned at switch enclosure is the latch structure with blunt end.
Described extension ladder is when lockup state, and lock pin is through upper ladder ladder leg sidewall pin-and-hole and descending stair ladder leg sidewall pin-and-hole, and lock pin, upper ladder sidewall pin-and-hole, lower ladder side wall pin hole, lockup switch spring and shift knob are coaxial.
Compared with background technology, beneficial effect of the present invention:
1, the present invention is simple to operation, can realize the function of automatic locking and unblock, Quick extension and contraction.In the present invention, staff only need mention certain ladder assembly, and locking system automatic locking can realize Quick extension; Staff only need press shift knob, and locking system according to level automatic unlocking, can realize rapid desufflation.The trouble of operable lock locking apparatus step by step can be saved, save time, raise the efficiency.
2, locking system structural safety of the present invention is reliable.Lock pin+locking spring+locking guide+gasket set is adopted to realize Bidirectional locking, the protruding panel beating mouth of V-type on lower ladder and upper ladder ladder leg top can guaranteeing still can realize automatic unlocking function in lock pin stretches out the longer distance in ladder surface, and whole apparatus structure is safe and reliable.
Accompanying drawing explanation
Fig. 1 is extended configuration structure diagram of the present invention;
Fig. 2 is extended configuration CONSTRUCTED SPECIFICATION figure of the present invention;
Fig. 3 is contraction state structure diagram of the present invention;
Fig. 4 is contraction state mechanical details figure of the present invention.
In figure: 1, lower ladder, 2, upper ladder, 3, lock pin, 4, locking spring, 5, locking guide, 6, sealing ring, 7, shift knob, 8, switch spring, 9, switch enclosure.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in figures 1 and 3, the present invention is at the terraced unit of extension ladder identical, the size gradation of nested multiple structure successively along its length, and the ladder of each terraced unit is formed by fixedly connecting with H type structure primarily of the stull between two terraced legs and two terraced legs; In arbitrary adjacent two terraced unit, be equipped with locking system between the both sides ladder leg that lower ladder 1 and upper ladder 2 connect, the terraced leg of upper ladder 2 is socketed in after in the terraced leg of lower ladder 1 and is connected separably by the locking system that structure is identical.
As shown in Figure 2 and Figure 4, locking system is arranged on stull close beneath, described locking system comprises lock pin 3, locking spring 4, locking guide 5, shift knob 7, switch spring 8 and switch enclosure 9, the equal symmetry of upper ladder 2 and lower ladder 1 sidewall both sides has pin-and-hole, the locking spring 4 of locking guide 5 built with level is housed between the both sides pin-and-hole of upper ladder 2, the two ends of locking spring 4 are connected with two lock pins 3 respectively, and lock pin 3 level is stretched out through the pin-and-hole on upper ladder 2 and lower ladder 1 sidewall successively; The lateral wall at lower ladder 1 pin-and-hole place is provided with switch enclosure 9, switch enclosure 9 is built with switch spring 8, switch spring 8 one end is connected to lower ladder 1 lateral wall and is enclosed within the extension of lock pin 3, the other end connects the shift knob 7 for pressing, shift knob 7 part is positioned at switch enclosure 9, and another part stretches out switch enclosure 9.
Switch enclosure 9 outer face has through hole, shift knob 7 outer end portion stretches out through hole, the side face that shift knob 7 is positioned at the inner end portion of switch enclosure 9 is provided with outward flange, the limited sidewall being stuck in switch enclosure 9 through hole of outward flange side step surface, opposite side step surface is connected with switch spring 8, outward flange structure ensures that shift knob 7 is at switch enclosure 9 internal motion, and switch spring 8 can make shift knob 7 reset.
Sealing ring 6 is provided with between locking guide 5 and upper ladder 2 sidewall, sealing ring 6 extends to direction in the middle part of locking guide 5 and is provided with boss, boss is between locking guide 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 ring 6 raised head face and makes locking guide 5 flange by sealing ring 6 boss axial limiting; Be provided with for the radial spacing inward flange of switch spring 8 in the middle part of locking guide 5 inside wall, locking guide 5 inward flange limits monosymmetric lock pin 3 axial movement position simultaneously, ensure, when two stressed injustice of lock pin 3 are symmetrical, still can be retracted in locking guide 5.
Matched in clearance between the terraced leg of upper ladder 2 and the terraced leg of lower ladder 1, can move freely along terraced leg direction between ladder when ensureing to shrink.Interference fit between the outer wall side face of sealing ring 6 boss and locking guide 5 inwall, between sealing ring 6 inwall side face and lock pin 3, between the flange of lock pin 3 and locking guide 5 inwall side face and lock pin 3 be matched in clearance respectively and between the pin-and-hole of upper ladder 2 and lower ladder 1, make lock pin 3 can vertically locking guide 5, sealing ring 6, on ladder 2 and lower ladder 1 pin-and-hole between move freely, ensure the flexibility of locking system, realize automatic locking and unlocking function.
Except uppermost terraced unit, all there is the V-type panel beating mouth of outwardly convex the both sides, terraced leg top of other all terraced unit, and V-type panel beating mouth is vertically corresponding with pin-and-hole, and with the pin-and-hole on terraced leg on same paralleling to the axis.When ladder shrinks, V-type panel beating mouth moves to lock pin 3 place of stretching out ladder, and lock pin 3 round end curved surface shrinks inside ladder along V-type panel beating mouth medial surface, realizes automatic unlocking.
The extension end face of lock pin 3 is round end, and other end is tack; Described extension ladder is when lockup state, and the round end curved surface of described lock pin 3 and the intersection of cylinder stretch out in outside lower ladder 1 sidewall, and its extension length can improve the reliability of extension ladder latch functions.The inner end portion that shift knob 7 is positioned at switch enclosure 9 is the latch structure with blunt end.
Extension ladder is when lockup state, the locking system be made up of lock pin, locking spring, locking guide and sealing ring is in lockup state, lock pin 3 is through upper ladder 2 terraced leg sidewall pin-and-hole and lower ladder 1 terraced leg sidewall pin-and-hole, and lock pin 3, upper ladder 2 sidewall pin-and-hole, lower ladder 1 sidewall pin-and-hole, lockup switch spring 7 and shift knob 7 are coaxial.
Stretching, extension principle of the present invention and process are:
When extension ladder be in contraction state need to stretch time, the lower ladder of fixing lowermost end, mentions certain ladder of upper end, ladder drives lock pin device to move up, and when lock pin arrives the pin-and-hole of ladder ladder leg upper end, locking spring stretches automatically, promote lock pin through pin-and-hole, realize stretching locking.By that analogy, between the ladder be raised and lowermost end ladder, lock pin all can automatic locking, realizes extension ladder and stretches, finally as depicted in figs. 1 and 2.
Contraction principle of the present invention and process are:
When extension ladder be in extended configuration need shrink time, need to press the shift knob being fixed on both sides on descending stair ladder leg simultaneously, compression lock pin move to terraced inboard leg, locking spring-compressed.When the intersection place of lock pin round end curved surface and Cylinder Surface starts lower than descending stair ladder leg inner surface, lock pin and upper ladder can start to move down; In folding process, descending stair ladder leg inner surface extrudes lock pin to the inside along lock pin round end curved surface, lock pin extruding locking spring.When the round end curved surface of lock pin is lower than descending stair ladder leg inner surface, upper ladder and upper module thereof can move down jointly, shrink.
When the locking pin-and-hole position of upper ladder ladder leg upper end is displaced downwardly to descending stair ladder leg top, the V-type panel beating mouth inner surface of descending stair ladder leg top projection is along the round end curved surface of lock pin to terraced inboard leg extruding lock pin, when the intersection place of lock pin round end curved surface and Cylinder Surface starts lower than upper ladder ladder leg inner surface, upper ladder ladder leg wall continues to extrude to terraced inboard leg along round end curved surface; When the round end curved surface of lock pin is lower than upper ladder ladder leg inner surface, upper end ladder unit can move down jointly, shrinks.
By that analogy, device for upper end all can unlock according to the method for above-mentioned unblock successively, realizes ladder contractile function, finally as shown in Figure 3 and Figure 4.
Claims (10)
1. an extension ladder, is characterized in that: at the terraced unit of extension ladder identical, the size gradation of nested multiple structure successively along its length, the ladder of each terraced unit is formed by fixedly connecting with H type structure primarily of the stull between two terraced legs and two terraced legs; In arbitrary adjacent two terraced unit, be equipped with locking system between the both sides ladder leg that lower ladder (1) and upper ladder (2) connect, the terraced leg of upper ladder (2) is socketed in after in the terraced leg of lower ladder (1) and is connected separably by the locking system that structure is identical.
2. a kind of extension ladder according to claim 1, it is characterized in that: described locking system is arranged on stull close beneath, described locking system comprises lock pin (3), locking spring (4), locking guide (5), shift knob (7), switch spring (8) and switch enclosure (9), the equal symmetry of upper ladder (2) and lower ladder (1) sidewall both sides has pin-and-hole, the locking spring (4) of locking guide (5) built with level is housed between the both sides pin-and-hole of upper ladder (2), the two ends of locking spring (4) are connected with two lock pins (3) respectively, lock pin (3) level is stretched out through the pin-and-hole on upper ladder (2) and lower ladder (1) sidewall successively, the lateral wall at lower ladder (1) pin-and-hole place is provided with switch enclosure (9), switch enclosure (9) is built with switch spring (8), switch spring (8) one end is connected to lower ladder (1) lateral wall and is enclosed within the extension of lock pin (3), the other end connects the shift knob (7) for pressing, shift knob (7) part is positioned at switch enclosure (9), and another part stretches out switch enclosure (9).
3. a kind of extension ladder according to claim 2, it is characterized in that: described switch enclosure (9) outer face has through hole, shift knob (7) outer end portion stretches out through hole, the side face that shift knob (7) is positioned at the inner end portion of switch enclosure (9) is provided with outward flange, the limited sidewall being stuck in switch enclosure (9) through hole of outward flange side step surface, opposite side step surface is connected with switch spring (8).
4. a kind of extension ladder according to claim 2, it is characterized in that: between described locking guide (5) and upper ladder (2) sidewall, be provided with sealing ring (6), sealing ring (6) is provided with boss to the direction extension of locking guide (5) middle part, boss is positioned between locking guide (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 ring (6) raised head face and makes locking guide (5) flange by sealing ring (6) boss axial limiting; Be provided with in the middle part of locking guide (5) inside wall for the radial spacing inward flange of switch spring (8).
5. a kind of extension ladder according to claim 2, it is characterized in that: interference fit between the outer wall side face of described sealing ring (6) boss and locking guide (5) inwall, between sealing ring (6) inwall side face and lock pin (6), between the flange of lock pin (3) and locking guide (5) inwall side face and lock pin (3) be matched in clearance respectively and between the pin-and-hole of upper ladder (2) and lower ladder (1).
6. a kind of extension ladder according to claim 1, is characterized in that: except uppermost terraced unit, all there is the V-type panel beating mouth of outwardly convex the both sides, terraced leg top of other all terraced unit, and the pin-and-hole on V-type panel beating mouth and terraced leg is on same paralleling to the axis.
7. a kind of extension ladder according to claim 1, is characterized in that: matched in clearance between the terraced leg of described upper ladder (2) and the terraced leg of lower ladder (1).
8. a kind of extension ladder according to claim 2, is characterized in that: the extension end face of described lock pin (3) is round end, and other end is tack; Described extension ladder is when lockup state, and the round end curved surface of described lock pin (3) and the intersection of cylinder stretch out in outside lower ladder (1) sidewall.
9. a kind of extension ladder according to claim 2, is characterized in that: the inner end portion that described shift knob (7) is positioned at switch enclosure (9) is the latch structure with blunt end.
10. a kind of extension ladder according to claim 2, it is characterized in that: described extension ladder is when lockup state, lock pin (3) is through upper ladder (2) terraced leg sidewall pin-and-hole and lower ladder (1) terraced leg sidewall pin-and-hole, and lock pin (3), upper ladder (2) sidewall pin-and-hole, lower ladder (1) sidewall pin-and-hole, lockup switch spring (7) 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 true CN105464578A (en) | 2016-04-06 |
| CN105464578B 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) |
Cited By (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 |
| CN111809725A (en) * | 2020-08-17 | 2020-10-23 | 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 |
Cited By (3)
| 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 |
| CN111809725A (en) * | 2020-08-17 | 2020-10-23 | 陈琇 | Building water-saving basement |
| CN111809725B (en) * | 2020-08-17 | 2021-06-25 | 陈琇 | Building water-saving basement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105464578B (en) | 2017-04-12 |
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