CN1123870A - Retractable ladder - Google Patents

Retractable ladder Download PDF

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Publication number
CN1123870A
CN1123870A CN95117319A CN95117319A CN1123870A CN 1123870 A CN1123870 A CN 1123870A CN 95117319 A CN95117319 A CN 95117319A CN 95117319 A CN95117319 A CN 95117319A CN 1123870 A CN1123870 A CN 1123870A
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CN
China
Prior art keywords
section
ladder
pillar
crossbeam
pin
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Granted
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CN95117319A
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Chinese (zh)
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CN1078925C (en
Inventor
寺本隆
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Individual
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Individual
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Publication of CN1123870A publication Critical patent/CN1123870A/en
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Publication of CN1078925C publication Critical patent/CN1078925C/en
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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • 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
    • E06C1/125—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic with tubular longitudinal members nested within each other

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Abstract

The invention provides a telescopic ladder which is provided with n sections (n is not less than 3). The invention is also provided with a clamping device and loosening device. Each clamping device is provided with a through hole which passes through a pillar overlapping position of the m-th section and the m plus1-th section when in stretching state, the joint of the transverse beam of the m-th section and the pillar, a pin which inserts into the through hole through the transverse beam of the m-th section, a sliding block which slides up and down in the transverse beam of the m-th section, and a thrust mechanism which pushes the sliding block to move downwards. The sliding block is matched with the rear of the pin. When the sliding block moves downwards, the sliding block guides the pin to be inserted into the through hole of the pillar between the m-th section and the m plus1st section; when the sliding block moves upwards, the pin is recovered into the transverse beam of the m-th section by the sliding block. The loosening device is a boss, which is arranged on the upper surface of the transverse beam of the first transverse beam. When the first section and the 1 plus 1st section are in contraction state, the sliding block at the 1 plus1st section is pushed upwards.

Description

Telescopic ladder
The present invention relates to a kind of ladder, relate to a kind of telescopic ladder in more detail.
In the past, telescopic ladder is disclosed in Japan Patent Publication Laid-Open the flat the 6-341281.As shown in Figure 1, this ladder has several sections section of ladders 2 1-2n, n are the step numbers of ladder.2 1Every section section of ladder of-2n all has the pillar 4 of a pair of hollow, and they are parallel to each other, the space.On pillar top parallel to each other, crossbeam 6 interconnects with pillar 4, is perpendicular to one another.Pillar 4 and crossbeam 6 for example, can be that metal is made.
The pillar thickness of every section section of ladder, (when pillar is circular cross section, being diameter) is all different.Bottom one section section of ladder 2 1Pillar thickness maximum, reduce in turn to the pillar thickness of uppermost one section section of ladder 2n.With section of ladder 2 2Pillar 4 bottoms from section of ladder 2 1Pillar upper end be inserted into section of ladder 2 1Relative pillar the inside is with section of ladder 2 3Pillar 4 bottoms from section of ladder 2 2Pillar upper end be inserted into section of ladder 2 3Relative pillar the inside.Equally, pillar 4 bottoms of top section of ladder are inserted into the inside of the relative pillar of below section of ladder.
If ladder is in contraction state, promptly section of ladder 2 1The crossbeam 6 adjacent one another are to the 2n section is in contact with one another, as the latter half of Fig. 1.If ladder is in stretched condition, promptly section of ladder 2 1Isolate mutually by predefined distance to the crossbeam that 2n is adjacent one another are, shown in Fig. 1 the first half.At contraction state, promptly when all adjacent beams 6 contact with each other, sell and the carrying ladder; At stretched condition, promptly when all adjacent beams are isolated mutually, use ladder.
Except the one section section of ladder 2n in the top, from 2 1To 2 N-1Every section section of ladder all be furnished with gripping mechanism 11, this device be located near the respective strut 4 crossbeam 6 in the groove of under shed, as shown in Figure 2, this clamping body is located near the two ends of crossbeams 6 pillar 4.(except that to the groove of under shed, crossbeam also forms whole U font sometimes).
Fig. 2 only expresses the gripping mechanism 11 that is contained in crossbeam one end, and the other end and other crossbeam also are equipped with same gripping mechanism 11 certainly.Hereinafter only explained, but this gripping mechanism also is fit to another with regard to one in a pair of gripping mechanism 11, and the gripping mechanism of other section section of ladder.
The section of ladder gripping mechanism has and inserts mechanism 10, and it is contained in the groove near the crossbeam 6 of pillar 4.Insert mechanism 10 and be furnished with thrust mechanism 12, it can promote to insert mechanism to pillar 4 motions.Each gripping mechanism also has a mating holes 8, and mating holes 8 is formed at above adjacent on the section of ladder pillar 4 ', and pillar 4 ' is inserted in the pillar 4.Insert mechanism 10 and advanced in the hole 8 by thrust device 12, this moment, ladder just remained on stretched condition.
Corresponding with each section of ladder gripping mechanism 11 is back-off assembly 14, when running it the time, it can be pulled out inserting in mechanism 10 holes 8.
It is bar-shaped to insert 10 one-tenth in mechanism, and it has main part 16, neck 18 and head 20.Main part 16 inserts through hole 24 slidably, and through hole 24 is formed on the abutment wall 22, and abutment wall 22 is located near two walls 25 of crossbeam 6.Thrust device 12 promotes main part 16, and the top of inserting mechanism is moved to pillar 4 by the guide hole on the wall 25 26.
Each thrust device 12 all has a helical spring 31, and helical spring 31 is contained between abutment wall 22 and the snap ring, and snap ring is fixed on the main part 16.
Back-off assembly 14 has a handle around axle 32 rotations, and axle 32 is fixed on the crossbeam.One end 34 of handle is hinged with the neck 18 that inserts mechanism 10, and the other end 36 is handles of control crank.Under the chimeric state in the hole 8 of inserting mechanism 10 and epimere section of ladder, as shown in Figure 3, handle faces down outstanding from crossbeam 6 following.When handle 36 is upwards promoted, when the soffit with crossbeam 6 flushes, insert mechanism 10 and just from hole 8, regain, as shown in Figure 2.As shown in Figure 1, at bottom one section section of ladder 2 1The bottom of pillar 4 anti-slip rubber plug 37 is housed, reinforcing crossmember 38 is located between the pillar 4.
For with ladder from complete stretched condition, (promptly all section of ladders all are in stretched condition) becomes complete contraction state (promptly all section of ladders are in contraction state), bottom one section section of ladder 2 1The outstanding downwards handles 36 of crossbeam 36, in the groove of the crossbeam 6 of boosting.So just with section of ladder 2 1Gripping mechanism from top section of ladder 2 2Pillar 4 ' in unclamp section of ladder 2 2Because deadweight and top 2 3To the weight of 2n section of ladder and glide, slide into section of ladder 2 1In.Therefore, section of ladder 2 2Pillar 4 ' enter the below section of ladder 2 1Pillar 4 in, up to section of ladder 2 2Crossbeam 6 and section of ladder 2 1Crossbeam 6 contact till.When section of ladder 2 2Crossbeam 6 and section of ladder 2 1Crossbeam 6 contact the time, stretch out below the crossbeam 6, section of ladder 2 2The handle 36 of disassemble device 14, by the section of ladder 2 of below 1Crossbeam 36 pushed away.Cause section of ladder 2 so in turn 3Gripping mechanism 11 unclamp section of ladder 2 3By deadweight and section of ladder 2 4Weight to 2n glides.Section of ladder 2 3Downslide 2 caused section of ladder 2 4Gripping mechanism unclamp.Equally, section of ladder 2 5To 2 N-1All gripping mechanisms unclamp section of ladder 2 1To 2 nGlide and shrink, last, ladder is in complete contraction state.
In order to use described this telescopic ladder, have to draw back all section of ladders, ladder could be upheld fully.During extension, the handle 36 of section of ladder gripping mechanism 11 stretches out from the soffit of crossbeam 6.This clothes and footgear that handle 36 tangles the ladder user can occur, jeopardizes the user.In addition, when factory assembling ladder, crossbeam 6 must be connected with the upper end of the pillar 4 of every section section of ladder, and what handle 36 must be with axle 32 is hinged.As seen existing artificial telescopic ladder needs many assembly processes.In addition, the pillar 4 and the crossbeam 6 of telescopic ladder are made of metal, even the crossbeam 6 that is made by relative lighter cast aluminium, it still is that the recuperation difficulty is removed.
One object of the present invention is exactly the defective that will reduce in the existing artificial telescopic ladder.
According to the present invention, telescopic ladder has n section section of ladder, every section section of ladder has the pillar of a pair of parallel to each other, each interval, hollow, pillar has certain thickness (being the diameter of every pillar circle section in the illustrated embodiment), also have a crossbeam that links to each other with the pillar upper end, n is the integer of n 〉=3 herein.Every pillar all has top-down axially extending bore.(topmost one section) reduces the thickness of pillar successively from first section section of ladder (bottom a section) to n section section of ladder, and the pillar of m+1 section section of ladder slides into or inserts the pillar through hole of m section section of ladder from the pillar top of m section section of ladder.Two sections section of ladders can be in contraction state and stretched condition, and the former is the state that the crossbeam of the crossbeam of m section section of ladder and M+1 section section of ladder contacts with each other; The latter is that the crossbeam each interval distance of m section and m+1 section section of ladder is the state of predetermined column length.
Every crossbeam can make groove near its two ends, also can be made up of for the parts of " U " type the cross section.
The section of ladder gripping mechanism is placed in the crossbeam groove of m section section of ladder, keep m and m+1 section section of ladder is in stretched condition, (1≤l≤n-2), lay back-off assembly, it can be thrown off l+1 and l+2 section section of ladder from stretched condition in l section section of ladder crossbeam groove.
Each gripping mechanism all has: through hole, and when m and m+1 section section of ladder were extended state, it vertically passed the overlapping part of enemy and m+1 section section of ladder pillar at m section section of ladder crossbeam place; Pin, it can stretch out the hole that penetrates on the pillar from enemy section section of ladder crossbeam; Slide block, it is placed in the enemy section section of ladder crossbeam groove, can slide up and down.The rear portion of slide block and pin is hinged.When slide block during, pin is stretched into to lower slider; When slide block upwards slides, pin is withdrawn in the m section section of ladder crossbeam.Gripping mechanism also has the thrust mechanism of pushing slide block downwards.
Each back-off assembly all has a boss, and it is located at the upper surface of l section section of ladder crossbeam.When l and l+1 section section of ladder were in contraction state, the boss of l section section of ladder beam surface upper upwards promoted the respective slide of l+1 section section of ladder gripping mechanism.
Each pin of gripping mechanism all has a neck and is connected the convex camber of neck rear end, and each slide block has first cam face, and it contacts with facing the convex camber that is connected to neck, and pin is retreated.Each slide block also has the 2nd shoe surface, and the another side contact of the convex camber that it is relative with neck promotes pin and inserts in the hole of pillar.
Above-mentioned convex camber can be spherical, and first, second shoe surface is the inner surface that is formed at the circular hole of above-mentioned slide block, and the diameter of its diameter and spherical convex camber is suitable.The slit (opening) that slide block also has the neck of supply and marketing nail to pass.
Crossbeam is made by synthetic resin and thermoplastic resin, and resin can be made desired shape.Best, resin can have hot expansibility after forming desired shape.
Every pillar all has a cannelure, and it forms along the outside, upper end of pillar.Every crossbeam all has a pillar pilot hole at its each end.Each pilot hole all has several boss, and it is arranged at certain intervals along the inner circumferential in hole, and charges in the cannelure of respective strut.The height of boss equals after resin is made crossbeam, the radial expansion volume of the pillar pilot hole when heat-treating for strengthening crossbeam.
Below in conjunction with figure embodiments of the invention are described.
The drawing brief description
Fig. 1 is the partial elevation view of original artificial telescopic ladder.
Fig. 2 is when two sections section of ladders are thrown off mutually, the local amplification profile of ladder among Fig. 1.
Fig. 3 is when two sections section of ladders block mutually, the local amplification profile of ladder among Fig. 1.
Fig. 4 is the partial elevation view about the telescopic ladder of one embodiment of the invention.
Fig. 5 a is an adjacent section of ladder when blocking mutually, and elevation cross-sectional view is amplified in the part of ladder shown in Figure 4.
Fig. 5 b is the sectional drawing of Fig. 5 a along A-A line.
Fig. 6 a is the sectional drawing of Fig. 5 a along B-B line.
Fig. 6 b is the sectional drawing of Fig. 5 a along C-C line.
Fig. 7 removes under the gripping orientation of two adjacent section of ladders, and front cross-sectional view is amplified in the part of ladder shown in Figure 4.
With reference to Fig. 4 to 7 one embodiment of the invention are described.According to this embodiment, telescopic ladder comprises 42 1To a plurality of gripping mechanisms 40 of 42n section section of ladder, a plurality of back-off assemblies 41.According to the telescopic ladder of making of this embodiment and Fig. 1 to major different between the existing ladder shown in Figure 3 be the structure of gripping mechanism, the structure of back-off assembly and the structure difference of crossbeam.
As shown in Figure 4,42 1Every section section of ladder to 42n has similar structure to existing ladder, promptly all has pair of posts 44 and a crossbeam 46, and every section section of ladder all has contraction and upholds two states.
42 1 Gripping mechanism 40 is all arranged to every section section of ladder of 42n, it is contained near the pillar 44 the groove that is formed at crossbeam 46.Replace the crossbeam of the groove of formation in the crossbeam, crossbeam also can be made up of the parts with U type cross section, and each gripping mechanism 40 and other member are contained in the U type space of each crossbeam 46.Back-off assembly 41 is contained in 42 1To 42 N-2Near the top pillar 44 of section section of ladder crossbeam 46, the structure of all gripping mechanisms 40 is identical, and the structure of all back-off assemblies 41 is also identical.Be simplified illustration, hereinafter only describe being contained in 42 2 Gripping mechanism 40 and back-off assembly 41 near the pillar of the section section of ladder left side.
Section of ladder gripping mechanism 40 comprises hole 47,48, pin 49, slide block 50 and spring 51.
Hole 47 is to run through section of ladder 42 2 Pillar 44 form, hole 48 is to run through section of ladder 42 3 Pillar 44 and form.When section of ladder 42 3When being in stretched condition, promptly section of ladder 42 3 Crossbeam 46 and section of ladder 42 2 Crossbeam 46 each interval preset distances the time, the hole 47 and 48 of Xing Chenging in this way toward each other, forms one and passes section of ladder 42 2With 42 3The through hole of both sides' pillar.
Pin 49 is placed in the length direction of crossbeam 46, and its top enters the mating holes 47 and 48 of alignment from the groove of crossbeam 46.One spherical convex camber 53 is arranged on the pin 49, and it is connected as a single entity by column neck 52 and pin 49 in the rear end of pin 49.The diameter of neck 52 is littler than the diameter of pin 49, and the diameter of spherical bellying 53 is bigger than the diameter of neck 52.Pin 49 has one section pars intermedia, and it passes the groove 54 of crossbeam 46 under shed.Locating snap ring 55 is fixed on the appropriate location of pin 49.When pin when pillar 44 directions move, locating snap ring contacts with the wall 100 of crossbeam 46, the restriction pin inserts the length of through hole 47 and 48.
Slide block 50 can slide up and down to be installed in the groove 56, and groove 56 is in crossbeam 46 and lays on the position at pin 49 rear portions under shed.Slide block 50 is square shapes, forms circular hole 57 thereon.It, is tiltedly stretched away from an edge of pillar 44 below to slide block near on one side of pillar 44 from slide block.The diameter of circular hole 57 is consistent with the diameter of the spherical bellying 53 of pin 49.Shown in Fig. 6 b, the width of opening (seam) 68 is littler than the diameter of circular hole 57, and it is on the one side near pillar 44, along the length direction extension of hole circle 57.The neck 52 of pin 49 passes opening 68, and 53 of heads are placed in the circular hole 57.Surface near the circular hole 57 of neck 52 is the first surface 58 of slide block, is the 2nd surfaces 59 of slide block away from the surface of the circular hole 57 of neck 52.When slide block 50 during in the position shown in Fig. 5 a and 5b, section of ladder is in gripping orientation, and the top of pin 49 was passed hole 47 and 48 and entered in the pillar 44 this moment.When slide block 50 upwards slided, the slide block first surface promoted spherical bellying 53 and moves backward, made pin 49 be withdrawn into as shown in Figure 7 releasing orientation.Under releasing orientation, if slide block 50 to lower slider, slide block the 2nd surface 59 acts on the globular part 53, promotes pin and moves forward, and forces pin 49 to move into the insertion state to pillar 44.
Spring 51 is compressed between the upper surface of the top of groove 56 and slide block 50 in advance, promotes slide block downwards.Spring can be a helical spring.The projection 60 of 50 upper surfaces of sliding is used for fixing spring 51 lower ends.
Cylindrical projection 61 is stretched downwards from the bottom surface of slide block 50.When pin 49 was in state shown in Fig. 5 a and the 5b, the lower surface of protuberance 61 was following roughly mutually neat with crossbeam 46.
Back-off assembly 41 is provided in a side of crossbeam 46 top cylindrical boss to upper process.As foregoing, at section of ladder 42 1To 42 N-2On the back-off assembly the same with the back-off assembly that illustrates is housed, section of ladder 42 2 Boss 41 face the preceding paragraph section of ladder 42 3The bottom face of protuberance 61 of slide block 50.
When section of ladder 42 2With 42 3When receiving compressive state as shown in Figure 7, section of ladder 42 1Back-off assembly 41 (shown in the chain-dotted line) and section of ladder 42 2The lower surface of protuberance 61 of slide block 50 contact, upwards promote section of ladder 42 2 Protuberance 61 because slide block 50 is moved upward, so removed the section of ladder 42 that constitutes by gripping mechanism 40 2With 42 3Chucking, result, section of ladder 42 2With 42 3Be in releasing orientation.
Pillar 44 can be the pipe that metal such as stainless steel are made.Crossbeam 46 and slide block 50 are to be made by synthetic resin, and expansive thermoplastic resin is made during preferably by the shaping after-baking, are more preferably by acetaldehyde resin to constitute.
Crossbeam 46 and being connected of pillar 44 are metals and being connected of synthetic resin, so undertaken by chimeric mode.Shown in Fig. 5 a and 5b, there is a cannelure 63 in the outside, the upper end of pillar 44; There is the pilot hole 64 of a chimeric pillar 44 at the two ends of every crossbeam 46.The inboard of pillar pilot hole 64 has a plurality of along circumference, be four boss 65 in the illustrated embodiment; See Fig. 5 b.Boss 65 is chimeric with groove 63.The height of boss 65 should equal after resin is made crossbeam, heat-treats for strengthening crossbeam, and for example crossbeam is heated 80 ℃ the time, the radial extent amount of crossbeam pillar pilot hole 64.
Shown in Figure 4, bottom one section section of ladder 42 1Column bottom anti-slip rubber pad 137 is arranged.At section of ladder 42 1The pillar two ends connect to strengthen with crossbeam 138.
Because uppermost section of ladder 42 1The top on do not had section of ladder, therefore gripping mechanism 40 just is not installed, again because uppermost section of ladder 42 in its crossbeam 46 1The top on difference made up with section of ladder again, so section of ladder 42 1With section of ladder 42 N-1Also just back-off assembly 62 need not be installed.
Though not shown, in order to prevent pillar slippage from the pillar of below section of ladder of top section of ladder, thereby below the inboard, upper end of every pillar of section of ladder all make an annular boss, on the lower end external surface of each pillar of section of ladder a snap ring is arranged in the above.Snap ring and annular protrusion contact with each other in case top pillar is drawn out.
When above-described ladder time spent not, all section of ladders are received the cripetura state.When preparing to use ladder, all section of ladders all are located at stretched condition, and they are tightened mutually, at first nethermost section of ladder 42 1From 42 of compression 2Pull out in-42n the section of ladder.Because back-off assembly does not act on section of ladder 42 1 Slide block 50, therefore act on the power of selling directly to households on the nail 49 and force them to move to the respective strut direction.When pulling out section of ladder 42 1The time, epimere section of ladder 42 2The hole 48 and hypomere section of ladder 42 of respective strut 44 1The hole 47 of respective strut 44 aim at, this moment section of ladder 42 1Be in extended state.At this moment section of ladder 42 1 Pin 49 be inserted through the hole 47 and 48 of mutual aligning, section of ladder 42 like this 1With 42 2Just tighten mutually.
In this state, at the 2nd section section of ladder 42 2 Slide block 50 and section of ladder 42 1Back-off assembly throw off because the effect of spring 51, section of ladder 42 2 Slide block 50 fall, act on second section section of ladder 42 2 Pin 49 on power force them to move to respective strut.Then, with the 3rd section and with epimere section of ladder 42 3-42n is from the 2nd section, section of ladder 42 2In pull out, in other words, the 1st and the 2nd section section of ladder 42 1, 42 2From the 3rd section and 3 with epimere section of ladder 42 3Pull out among-the 42n.Section of ladder 42 2 Pillar 44 on hole 47 and section of ladder 42 3 Pillar 44 on hole 48 aim at section of ladder 42 2 Pin 49 penetrate hole 47 and 48, two section of ladders are tightened.In the same way, the section of ladder of top is pulled out from the section of ladder that stretch out the below, or the section of ladder that stretch out the below is pulled out from the section of ladder of top, successively the section of ladder of top is stretched out and automatically with the section of ladder chucking of they and below.
For ladder is recovered to compressive state, so upwards promote hypomere section of ladder 42 1The protuberance 61 of slide block 50, it can be with section of ladder 42 2From section of ladder 42 1In unclamp.Because deadweight, the 2nd section to n section section of ladder 42 2-42n glides, and causes section of ladder 42 2 Crossbeam 46 and with section of ladder 42 1Crossbeam 46 be close together.So just cause section of ladder 42 1 Protuberance 41 be that back-off assembly upwards promotes section of ladder 42 2 Slide block 50, cause section of ladder 42 3With section of ladder 42 2Between fixedly be disengaged.In the same way, the section of ladder of top successively from the below section of ladder of their combinations unclamp, the top section of ladder slides successively, and is last, ladder just is in compressive state.
By device described above as can be seen, telescopic ladder of the present invention has many advantages.For example, when pulling out section of ladder 42 1During-42n, ladder just is in stretched condition, and all slide blocks 50 of section of ladder all are in extreme lower position.But the bottom surface of the protuberance 61 of slide block 50 does not exceed the base of crossbeam 46.Therefore, when the ladder that uses the present invention to make is in stretched condition, user's the clothes and the phenomenon at a certain position of health will never appear tangling.As seen this ladder is safe.
Because of each pin 49 all has neck 52 and is in the globular part 53 that the pin rear portion links to each other with neck 52, each slide block 50 all has the circular port 57 with first and second shoe surface 58 and 59, therefore utilize a simple mechanism, promptly slide block 50, just can cause that pin 49 inserts or extracts out from the hole of pillar.As seen, the chucking of section of ladder and back-off assembly are simple.In addition, bellying 53 uses the ball-type parts, and inner surface is the use of the cross section of first and second cam faces for circular hole 57, and cam that can simple structure is as slide block 50.
In addition, because crossbeam 46 is made by synthetic resin, the ladder that therefore uses the present invention to make is most of all lighter with metal ladder than original.The particularly use of thermoplastic resin, as acetaldehyde resin, the shock resistance of crossbeam and resistance to chemical attack improve.
Pillar 44 and crossbeam 46 can link in the following manner.At first, with 46 thermal expansions of every crossbeam,, pillar 44 is inserted in the pilot hole 64 at crossbeam two ends when it is in when swelling state.The height of each boss 65 is determined by aforesaid requirement in the groove 63, and protuberance 65 does not hinder pillar 44 to insert in the pilot hole 64.Afterwards, cooling cross beam 46 and pillar 44 are along with the contraction of crossbeam 46, in boss 65 embedded grooves 63.This combination is as intermetallic shrink fit, and in protuberance 65 embedded grooves 63, so can obtain very firm combination.After crossbeam and pillar binding were finished, the heat treatment of reinforcing crossmember was also just finished.Therefore, the assembling of ladder is simple being easy to, and assembling institute's time spent is not long yet.
Though the cross section of the pillar described in the figure is round, their cross section can be rectangle or other polygon in practice.In addition, if the weight of crossbeam and anti-chemical capacity have no problem, crossbeam also can be made of metal, as cast aluminium.Certainly, acetaldehyde resin, other resin, resembling nylon and FRP etc. can.

Claims (5)

1. telescopic ladder, comprise: n section section of ladder, n is the integer more than or equal to 3, every section section of ladder has a pair of parallel to each other and be separated with the pillar of the hollow of certain intervals, with a crossbeam that is connected with the pillar upper end, every pillar all has the pillar through hole that extends from the top down along its length, with certain thickness, the thickness of pillar reduces to n section section of ladder successively from first section section of ladder as hypomere, the pillar of m+1 section section of ladder injected be close to it and hang down in pillar through hole of one section than it, m is the integer of 1≤m≤n-1, enemy section and m+1 section section of ladder can be in compressive state and stretch out state, the former is the state that the crossbeam of m section and m+1 section section of ladder contacts with each other, and the latter is that the crossbeam of m section and m+1 section section of ladder is each other at a distance of the state of predefined column length;
Gripping mechanism, gripping mechanism are located in the crossbeam of m section section of ladder to be used for tightening m and m+1 section section of ladder is in stretched condition;
Back-off assembly is contained in the crossbeam of l section section of ladder, and l is the integer of 1≤l≤n-2, is contained in the back-off assembly in the l section section of ladder crossbeam, is to be used for l+1 and l+2 section joint are thrown off from stretched condition.
Gripping mechanism has through hole, and section of ladder is in when upholding, and in crossbeam and its pillar junction of m section section of ladder, it passes the overlapping part of m and m+1 section section of ladder pillar; Pin, it can stretch in the through hole of aforementioned overlapping part from m section section of ladder crossbeam; Slide block, it is installed in the crossbeam of m section section of ladder and can slides up and down; And promote the dipper crowding gear that slide block moves down; The tip engages of slide block and pin, when slide block moved downward, slide block promoted pin and stretches in the through hole at m and m+1 section section of ladder pillar overlapping part place, and when slide block moved upward, slide block forced in the crossbeam of pin withdrawal m section section of ladder;
Aforementioned each back-off assembly comprises a boss, and boss is in the beam surface upper of l section section of ladder, and when l and l+1 section section of ladder were in compressive state, the boss of l section section of ladder upwards headed on the slide block of l+1 section section of ladder.
2. telescopic ladder according to claim 1, each pin all comprises neck and the convex camber that is connected with neck at the pin rear portion, the size of this part is bigger than the size of neck, each slide block all contains first shoe surface, the neck side contacts of it and pin convex camber, pin is withdrawed from from the hole of the lap of two sections section of ladder pillars, each slide block also has the 2nd shoe surface, it bloats most another with pin and contacts with the neck opposite end, promotes pin and inserts in the hole of two sections section of ladder pillar laps.
3. telescopic ladder as claimed in claim 2, the convex camber of above-mentioned pin all are ball shapes, and first, second shoe surface is a part that forms the inner surface of circular hole in the slide block, and the diameter of the spherical portion of its cross section diameter and pin is suitable; Slide block has an opening, and from then on the neck of being convenient to pin passes.
4. as claim 1,2,3 described telescopic ladders is characterized in that: every crossbeam is made by synthetic resin.
5. telescopic ladder as claimed in claim 4, the upper end periphery of every pillar all has a cannelure; All there is a pillar pilot hole at the two ends of every crossbeam, it is used for mounting column, each pillar pilot hole is distributed with several boss at certain intervals along week in it, groove on boss and the pillar is chimeric, when the section of ladder crossbeam was heated to the reinforcement heat treatment temperature, the height of boss equaled the radial expansion volume of pillar pilot hole.
CN95117319A 1994-11-29 1995-09-11 Retractable ladder Expired - Fee Related CN1078925C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6321780A JPH08151882A (en) 1994-11-29 1994-11-29 Ladder
JP321780/94 1994-11-29

Publications (2)

Publication Number Publication Date
CN1123870A true CN1123870A (en) 1996-06-05
CN1078925C CN1078925C (en) 2002-02-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN95117319A Expired - Fee Related CN1078925C (en) 1994-11-29 1995-09-11 Retractable ladder

Country Status (3)

Country Link
JP (1) JPH08151882A (en)
KR (1) KR0162705B1 (en)
CN (1) CN1078925C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008064555A1 (en) * 2006-11-27 2008-06-05 Zhengping Su An auto-retractable extersion ladder
CN101096903B (en) * 2006-06-30 2010-05-12 科尔分配股份有限公司 Ergonomic extendable/retractable ladder
CN102031927A (en) * 2009-09-29 2011-04-27 特殊梯子制作所有限会社 Escaping ladder
CN102741494B (en) * 2008-09-25 2015-03-25 郭晶耀 An extension ladder
CN108437090A (en) * 2018-03-20 2018-08-24 湖州职业技术学院 A kind of carpenter's hole making drill

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JP5253342B2 (en) * 2009-09-28 2013-07-31 アルインコ株式会社 Telescopic ladder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101096903B (en) * 2006-06-30 2010-05-12 科尔分配股份有限公司 Ergonomic extendable/retractable ladder
WO2008064555A1 (en) * 2006-11-27 2008-06-05 Zhengping Su An auto-retractable extersion ladder
CN102741494B (en) * 2008-09-25 2015-03-25 郭晶耀 An extension ladder
CN102031927A (en) * 2009-09-29 2011-04-27 特殊梯子制作所有限会社 Escaping ladder
CN102031927B (en) * 2009-09-29 2014-11-12 特殊梯子制作所有限会社 Escaping ladder
CN108437090A (en) * 2018-03-20 2018-08-24 湖州职业技术学院 A kind of carpenter's hole making drill

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JPH08151882A (en) 1996-06-11
KR0162705B1 (en) 1998-12-15
KR960018141A (en) 1996-06-17
CN1078925C (en) 2002-02-06

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