CN102465662A - Telescoping ladder - Google Patents
Telescoping ladder Download PDFInfo
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- CN102465662A CN102465662A CN2010105339273A CN201010533927A CN102465662A CN 102465662 A CN102465662 A CN 102465662A CN 2010105339273 A CN2010105339273 A CN 2010105339273A CN 201010533927 A CN201010533927 A CN 201010533927A CN 102465662 A CN102465662 A CN 102465662A
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- Prior art keywords
- ladder
- pedal
- joint component
- stop pin
- higher level
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- 230000002687 intercalation Effects 0.000 claims description 26
- 238000009830 intercalation Methods 0.000 claims description 26
- 230000008602 contraction Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 210000003811 finger Anatomy 0.000 description 12
- 210000004247 hand Anatomy 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 210000005224 forefinger Anatomy 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 241000538562 Banjos Species 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 210000003813 thumb Anatomy 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
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- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000278713 Theora Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003042 antagnostic effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001574 biopsy Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
Images
Classifications
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- 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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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/003—Indicating devices, e.g. user warnings or inclinators
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
本发明提供一种伸缩梯子，能够可靠地防止梯子收缩时夹到手指，具有优良的梯子伸缩操作的安全性。将在左右一对筒状支柱(1)的上端部之间通过接头部件(2)横架有筒状的踏板(3)的多个门形梯子部件(10)，以使筒状支柱(1)彼此呈套管式嵌合的方式配置成上下多级，并且该接头部件(2)内置有将梯子伸展时的上级侧的门形梯子部件(10)保持为不能升降的锁定装置(5)，并且该锁定装置(5)的滑动操作片(53a)向踏板(3)的左右两侧的侧面(3a)外部露出。接头部件(2)是由外嵌固定在筒状支柱(1)上的环部(21)、向该踏板(3)内嵌插的嵌插框部(22)、从该环部(21)中的嵌插框部(22)侧向上方突出的上级承接部(23)一体化而成的。上级承接部(23)与上级侧的门形梯子部件(10)中的接头部件(2)的下表面侧抵接，由此，在梯子收缩时，在上下相邻的门形梯子部件(10)彼此的踏板(3)间、和在接头部件(2)的环部(21)中的梯子外侧部间，构成防夹手的间隙(t1、t2)。
The invention provides a telescopic ladder, which can reliably prevent fingers from being caught when the ladder is retracted, and has excellent safety in telescopic operation of the ladder. Between the upper ends of a pair of cylindrical pillars (1) on the left and right, a plurality of door-shaped ladder parts (10) with cylindrical pedals (3) are horizontally mounted on the joint part (2), so that the cylindrical pillars (1 ) are arranged in multiple stages up and down in a sleeve-fitting manner with each other, and the joint part (2) has a built-in locking device (5) that keeps the upper door-shaped ladder part (10) on the upper stage side when the ladder is extended. , and the sliding operation piece (53a) of the locking device (5) is exposed to the outside of the side surfaces (3a) on the left and right sides of the pedal (3). The joint part (2) is composed of a ring part (21) fixed on the cylindrical pillar (1), an inserting frame part (22) inserted into the pedal (3), and a ring part (21) from the ring part (21). The upper receiving part (23) protruding upward from the side of the inserting frame part (22) in the middle is integrally formed. The upper-stage receiving part (23) abuts against the lower surface side of the joint part (2) in the door-shaped ladder part (10) on the upper stage side, whereby when the ladder shrinks, the upper and lower adjacent door-shaped ladder parts (10) ) between the pedals (3) of each other, and between the outer parts of the ladder in the ring part (21) of the joint part (2), form a gap (t1, t2) for preventing hands from being pinched.
Description
Technical field
The present invention relates to the improvement of extension ladder, this extension ladder be between the upper end of pair of right and left tubular pillar crossbearer a plurality of shape ladder sections of pedal be the chimeric extension ladder that forms of bushing type each other with the tubular pillar.
Background technology
Generally; As shown in Figure 9; The structure of this extension ladder is following: will be between the upper end of each pair of right and left tubular pillar 1,1 through joint component 2 crossbearer pedals 3 and become a shape, a plurality of more little shape ladder sections 10 of the diameter of higher level's side neck shape pillar 1 more, be the chimeric mode of bushing type each other with tubular pillar 1 and constitute the ladder of multistage (among the figure being 12 grades) up and down.And; In such extension ladder; Through being built in joint component 2 or the locking device in the pedal 3 (omitting diagram), can the door shape ladder sections 10 of the higher level's side that stretches be locked as and can not go up and down, therefore except that each shape ladder sections 10 the higher level; Maximum extension state from the contraction state of this Fig. 9 (b) to this Fig. 9 (a) can carry out and the corresponding multistage height adjustment of quantity of door shape ladder sections 10.In addition, on the door shape ladder sections 10 of subordinate, be used for reinforcing, also crossbearer has pedal 4 between the bottom of two tubular pillars 1,1.
As above-mentioned joint component 2, use a kind of ring portion of the upper end that outer build-in is fixed on tubular pillar 1 and the hard resin shaping thing that the intercalation frame integrally of intercalation forms in pedal 3.In addition, as above-mentioned locking device, usually by constituting: the stop pin that the lock hole on the lower side of the tubular pillar 1,1 under lock-out state in the door shape ladder sections 10 of the higher level's side that penetratingly is located at stretching, extension inserts with lower component; The spring members that this stop pin is suppressed to locking direction; Engage and make the slidingtype that this stop pin slides to non-locking direction or the latch-release parts (for example, patent documentation 1,2) of rotary type rod-type with this stop pin.
Yet; In widely used extension ladder in the past, when the extended configuration when using shrinks it, through finger manipulation make successively in the door shape ladder sections 10 at different levels about suppressing of latch-release parts antagonistic spring parts slide; But tend to take place the door shape ladder sections 10 of higher level's side that banjo splint falls following this latch-release and the situation between the door shape ladder sections 10 in the operation; Especially, because the latch-release position of subordinate's side, the progression of the door shape ladder sections of upper side is many more; It is big more to fall weight, so abnormally dangerous.
Therefore; The applicant has proposed a kind of scheme in advance; Clamp operator's finger between the pedal of neighbouring door shape ladder sections when preventing that ladder from shrinking, the gap maintaining body (patent documentation 3) in the gap of guaranteeing to prevent that clip finger is used is set between the pedal of the door shape ladder sections up and down under contraction state.And; As the concrete example of this gap maintaining body, proposed with pedal install with short-tube component (ring portion of joint component) only with Len req to above or below the mode that prolongs and on this short-tube component or down the impact of setting-in Rack relax the mode of encircling.
Patent documentation 1: Japan special table 2004-522882 communique
Patent documentation 2: Japan special table 2008-542593 communique
Patent documentation 3: TOHKEMY 2007-186898 communique
The extension ladder that is provided with the gap maintaining body that above-mentioned the applicant's motion is related is compared with widely used extension ladder in the past; Safety during the ladder shrinkage operation significantly improves; But the operability under the behavior in service of reality is done can know after the further careful checking, have the further leeway of improvement.Promptly; When the ladder of the extended configuration of operator after use shrinks; Grip and to erect posture supporting ladder through the tubular pillar of both hands about the door shape ladder sections that is positioned at desired height; In common operation, under the ladder outer fix state of contact of the ring portion of both hands palm and joint component, the latch-release parts of the thumb press pedal side through both hands carry out the latch-release operation; Therefore, forefinger and middle finger also might be sandwiched between the ring portion of the door shape ladder sections of higher level's side of following this latch-release and descending and the door shape ladder sections in the operation.
Summary of the invention
The present invention In view of the foregoing, its purpose is to provide a kind of extension ladder, can prevent to clip to finger when ladder from shrinking, and has the safety of the flexible operation of good ladder.
The Reference numeral of the embodiment of stating behind the mark describes the means that are used to solve above-mentioned problem; The extension ladder of technical scheme 1 of the present invention is; A plurality of the shape ladder sections 10 that the pedal 3 of tubular will be between the upper end of pair of right and left tubular pillar 1,1 be arranged through joint component 2 crossbearers ... So that tubular pillar 1 ... Being the chimeric mode of bushing type each other is configured to multistage up and down; And the door shape ladder sections 10 of the higher level's side when this joint component 2 or pedal 3 are built-in with ladder stretched remains the locking device 5 that can not go up and down; And the latch-release operating portion of this locking device 5 (slide sheet) 53 exposes to the 3a outside, side of the left and right sides of pedal 3; It is characterized in that, joint component 2 be by outer build-in fix on the upper end of tubular pillar 1 ring portion 21, extend and from the intercalation frame portion 22 of openend 31 intercalation to this pedal 3 in of pedal 3, intercalation frame portion outstanding higher level's carrier 23 integrated the forming in side direction top from this ring portion 21 the lower face side butt of the joint component 2 in the shape ladder sections 10 of higher level's carrier 23 and higher level's side of shrinking to the side from this ring portion 21; Thus; When ladder shrinks, between neighbouring door shape ladder sections 10,10 3,3 on pedal and the ladder outside portion in the ring portion 21 at joint component 2 each other, constitute clearance t 1, the t2 of anti-tong respectively.
The extension ladder of technical scheme 2 is; In technique scheme 1; The clearance t 2 of the anti-tong that the ring portion of joint component 2,2 is 21,21 is formed in 1/3 all scopes in the outside of ladder at least in this ring portion 21, and the upside periphery 20 of this ring portion 21 is upwards gradient from the 20a of gap formation portion that prevents tong to higher level's carrier 23.
The extension ladder of technical scheme 3 is; In technique scheme 1 or 2, locking device 5 is by constituting with lower component: insertion penetratingly is located at the stop pin 51 in the lock hole 11 of lower side of the tubular pillar 1 in the door shape ladder sections 10 of higher level's side of stretching, extension under lock-out state; The spring members (disc spring) 52 that this stop pin 51 is suppressed to locking direction; The latch-release parts 53 that are fastened on this stop pin 51 and this stop pin is slided to non-locking direction as the latch-release operating portion.
The extension ladder of technical scheme 4 is; In technique scheme 3, stop pin 51 has the circular layer difference 51b of portion in the face of locking direction, on joint component 2, is formed with the relative stopper section 27 with this circular layer difference 51b of portion; Under the lock-out state of this stop pin 51; Through the butt of circular layer difference 51b of portion and stopper section 27, stop pin 51 is restricted to the length of charging into of lock hole 11, and the elastic force of spring members 52 does not apply load to latch-release parts 53.
The extension ladder of technical scheme 5 is; In each of technique scheme 1 to 4; Constitute; Side (front surface) 3a at the pedal 3 of each shape ladder sections 10 is last, shows the lock-out state and the latch-release state of locking device 5 with the colour-coded (green circle 6G, red circle 6R) of different tones.
The extension ladder of technical scheme 6, last at side (surface, the back) 3b of the pedal 3 of each shape ladder sections 10 in each of technique scheme 1 to 4, show the numerical value 7 of the ladder height when being stretched over this shape ladder sections 10.
The effect of invention
With reference to after the Reference numeral of the embodiment stated the effect based on the invention of above-mentioned solution mechanism is described; Extension ladder according to technical scheme 1; When the extension ladder that makes the extended configuration after being in use shrinks; Grip through both hands H, H the door shape ladder sections 10 that is positioned at desired height about tubular pillar 1,1 and to erect posture supporting ladder; The palm of these both hands H, H is ridden on the ladder outer fix of ring portion 21 of joint component 2; Under this state, the latch-release operating portion (slide sheet) 53 of the side 3a of the thumb F1 through both hands H, H, F1 pushing pedal 3 also carries out the latch-release operation, still; The lower face side butt of the joint component 2 of the door shape ladder sections 10 of the higher level's side that descends following this latch-release has higher level's carrier 23 of the joint component 2 in the door shape ladder sections 10 in this operation; Thus, be formed with the clearance t 1 of anti-tong, and also be formed with the clearance t 2 of anti-tong between the ladder outside portion in the ring portion 21,21 of joint component 2,2 up and down at 3,3 on the pedal of a neighbouring shape ladder sections 10,10.Therefore; Even carrying out operator's mistake of shrinkage operation rides over finger on the pedal 3 of the door shape ladder sections 10 in the latch-release operation; Owing to avoided banjo splint between the pedal 3 of the door shape ladder sections 10 of higher level's side of this pedal 3 and decline; Even so on the ring portion 21 that the forefinger F2 of the both hands H of the tubular pillar 1,1 about gripping, H or middle finger F3 ride over joint component 2; These forefingers F2 and middle finger F3 can not be clipped in two ring portions 21 yet, between 21, can operate safely and efficiently.
Extension ladder according to technical scheme 2; Because the clearance t 2 of the anti-tong that the ring portion of neighbouring joint component 2,2 is 21,21 is formed in 1/3 all scopes in the outside of ladder at least in this ring portion 21; And the upside periphery 21a of this ring portion 21 is upwards gradient from the both ends of the gap formation portion 20 of anti-tong to higher level's carrier 23; Therefore; Can prevent banjo splint reliably in two ring portions 21, between 21, and can prevent reliably that palm is clipped between the joint component 2 of higher level's carrier 23 and higher level's side.
According to the extension ladder of technical scheme 3, because locking device 5 is the simple structures that are made up of stop pin 51, spring members (disc spring) 52 and latch-release parts 53, therefore, its reliable in action, and have advantage with easy making of low cost and assembling.
According to the extension ladder of technical scheme 4, under the lock-out state of the stop pin 51 in locking device 5, through stopper section 27 butts of this circular layer difference 51b of portion and joint component 2 sides; The elastic force of spring members 52 does not apply load to latch-release parts 53, and therefore, these latch-release parts 53 are difficult to come off or damage from stop pin 51; Correspondingly; Durability as locking device 5 is good, though these latch-release parts 53 come off from stop pin 51 or situation about damaging under because this stop pin 51 does not enter in the tubular pillar 1 more deeply; Therefore, have through changing this stop pin 51 and just can easily repair the advantage of locking device 5.
Extension ladder according to technical scheme 5; Because on the side of the pedal 3 of each shape ladder sections 10; The colour-coded (green circle 6G, red circle 6R) of different tones under the lock-out state that is presented at locking device 5 and the latch-release state, therefore, before ladder being stretched rise; Can whether be locked reliably through the door shape ladder sections 10 at different levels that this colour-coded easily confirmed to stretch, and then the safety can guarantee that ladder uses the time.
Extension ladder according to technical scheme 6; Because on the side of the pedal 3 of each shape ladder sections 10; Show the height number 7 when making ladder be stretched over this shape ladder sections 10; Therefore, have and to operate the advantage that needed ladder spans are simply set through 7 pairs of this height numbers.
Description of drawings
Fig. 1 is the front view of contraction state of the extension ladder of expression an embodiment of the invention.
Fig. 2 is the figure of major part in the contraction state of this extension ladder of expression, and Fig. 2 (a) is a front view, and Fig. 2 (b) is that cross section along the A-A line of Fig. 2 (a) is to view.
Fig. 3 is the figure of major part in the extended configuration of this extension ladder of expression, and Fig. 3 (a) is the biopsy cavity marker devices front view, and Fig. 3 (b) is that cross section along the B-B line of Fig. 3 (a) is to view.
Fig. 4 is the sectional view along the C-C line of Fig. 3 (b).
Fig. 5 is the sectional view along the D-D line of Fig. 3 (b).
Fig. 6 is the front view of the major part of the shrinkage operation that from extended configuration begin of expression in this extension ladder.
Fig. 7 is the figure of the door shape ladder sections snap action each other of this extension ladder of expression, and Fig. 7 (a) is the vertical profile lateral view of the major part before the engaging, and Fig. 7 (b) is the vertical profile lateral view of the major part after the engaging.
Fig. 8 is the rear elevation of the major part of this extension ladder.
Fig. 9 representes the figure of widely used extension ladder in the past, and Fig. 9 (a) is the stereogram of extended configuration, and Fig. 9 (b) is the stereogram of contraction state.
The explanation of Reference numeral
1 tubular pillar
10 shape ladder sections
11 lock holes
2 joint components
20 upside peripheries
The gap formation portion of the anti-tong of 20a
20b rake (upwards gradient)
21 ring portions
22 intercalation frame portions
23 higher level's carriers
27 stopper sections
3 pedals
3a front surface (side)
Surface (side) behind the 3b
31 openends
5 locking devices
51 stop pins
The 51a leading section
51b circular layer difference portion
52 disc springs (spring members)
53 latch-release parts
53a slide sheet (latch-release operating portion)
The green circle of 6G (colour-coded)
The red circle of 6R (colour-coded)
The numerical value of 7 ladder height
The gap of t1, the anti-tong of t2
The specific embodiment
Below specify with reference to accompanying drawing with regard to an embodiment of extension ladder of the present invention.As shown in Figure 1; Its basic structure of this extension ladder was with widely used ladder was identical in the past; Between the upper end of each pair of right and left tubular pillar 1,1 through joint component 2 crossbearers a plurality of shape ladder sections 10 of pedal 3; Tubular pillar 1 is chimeric with telescopic mode each other, constitute the ladder of multistage (among the figure being 12 grades) up and down.And, in each shape ladder sections 10 the higher level, the slide sheet 53a of the latch-release parts 53 (with reference to Fig. 2 (b), Fig. 3 (b)) in the locking device of after the left and right sides of the front surface 3a of its pedal 3 disposes, stating 5.In addition, on the door shape ladder sections 10 of subordinate, be also used as reinforcing, also crossbearer has pedal 4 between the bottom of two tubular pillars 1,1.On the other hand, the rubber system cap 8 that buffering usefulness is housed in order to prevent to scratch upright object of offering sb. a chance to remedy a fault gracefully, is covered in the top of the tubular pillar 1,1 in higher level's door shape ladder sections 10 with the mode that covers joint component 2.
The tubular pillar 1 of door shape ladder sections 10 is made up of metal tubulation materials such as aluminium alloys or stainless steels, for bushing type chimeric and form lean on higher level's side more door shape ladder sections 10 in it external diameter more little.In addition, pedal 3 is made up of the aluminium extruded sections of rib tubular roughly, and is accordingly poor with the footpath of tubular pillar 1, leans on door shape ladder sections 10 its left and right sides width of higher level's side wide more more.
Like Fig. 2～shown in Figure 5, the joint component 2 of each shape ladder sections 10 is by the ring portion 21 of the upper end of hard zygostyle 1, extend and higher level's carrier of giving prominence to from the intercalation frame portion 22 of openend 31 intercalation to this pedal 3 in of pedal 3, intercalation frame portion side direction top from this ring portion 21 23 is integrated forms to the side from this ring portion 21.And; When ladder shrinks; As shown in Figure 2; The lower face side butt of the joint component 2 in the door shape ladder sections 10 of higher level's carrier 23 of the joint component 2 of each shape ladder sections 10 and higher level's side, thus, at each other pedal 3 of neighbouring door shape ladder sections 10,10, constitute clearance t 1, the t2 of anti-tong between 3 and between the ladder outside portion in the ring portion 21 at same joint component 2 respectively.As an example of the gap width of the clearance t 1 of anti-tong, t2, preferably in the scope of 10mm～30mm, its reason is, even point the minimum gap width that also needs 10mm of thin people; About the upper limit, owing to have the situation that gloves use of dressing, therefore; The gap width that needs 30mm, and, if the above gap width of this upper limit; Then when extension ladder flexible, gap width is excessive, may cause volume big.In addition, the clearance t 2 of the anti-tong of 21,21 of ring portions is set with the mode in the roughly half cycle scope that is formed on the ladder outside in this ring portion 21.In addition, the upside periphery 20 of ring portion 21 is the upwards rake 20b (with reference to Fig. 2) of gradient from the 20a of gap formation portion that prevents tong to higher level's carrier 23.
The ring portion 21 of joint component 2 ruptures along fore-and-aft direction with intercalation frame portion 22 radially opposite sides; And the ear 24,25 that has outwards outstanding and relative heavy wall in the both sides of the 21a of this fracture portion; Among the screwed hole 24a in the ear that is located at a side 24; Screw togather the hold-down screw 9 that the screw through hole 25a from the ear 25 that is located at opposite side passes, thus, binding should the 21a of fracture portion and is constituted ring.In addition, on the interior week of this ring portion 21, near upper limb, be formed with the downward circular layer difference 21b of portion (with reference to Fig. 3), and in upper edge, above-below direction centre position circumferentially equally spaced outstanding a plurality of (among the figure being four) the fastening projection 21c that is provided with.
And; Ring portion 21 is following with respect to the installation of the upper end of tubular pillar 1, at first, and under the non-connecting state of the 21a of fracture portion; The circular layer difference 21a of portion of this ring portion 21 is fastened on the upper end of tubular pillar 1; And each fastening projection 21c is embedded in each fastening hole 12 of penetratingly being located on the tubular pillar 1, then, gets final product through the fastening binding of screwing togather of hold-down screw 9 ear 24,25.Thus, ring portion 21 can not be fixed on the upper end of tubular pillar 1 with breaking away from.
The intercalation frame portion 22 of joint component 2 have be rib tubular roughly and in the two sides of length direction pars intermedia the 22a of window portion of opening, and form the rectangle fastening frame 22b of downward opening in the width both sides at rear portion, be assembled with locking device 5 in inside.And; As shown in Figure 4; This intercalation frame portion 22 is under the state of intercalation in pedal 3; Each fastening tab 33 through making bending to the inside is embedded in the rectangle fastening frame 22b from a pair of コ notched cut 34,34 on the diapire of being located at this pedal 3, and is fixed to and can not extracts from this pedal 3, and the 22a of window portion of its ladder front surface side faces the slotted hole 32 of the front surface 3a that is located at pedal 3.In addition, the reason that the 22a of window portion of intercalation frame portion 22 is positioned at two sides is, as about joint component 2 can to make the identical parts of structure put upside down 180 degree shared.
Higher level's carrier 23 of joint component 2, shown in Fig. 7 (a), the width that intercalation frame portion 22 is shown on its top greatly becomes level, and is formed with tab 23a upwards on its central portion.Shown in Fig. 7 (b), this tab 23a is embedded into when ladder shrinks among the 22d of embedded hole portion of downward opening of the joint component 2 in the door shape ladder sections 10 of higher level's side.
Locking device 5 is by constituting with lower component: the metal lockmaking rationed marketing 51 that is configured in the circular shaft shape on the central part of intercalation frame portion 22 of pedal 3 or joint component 2 along its length; The disc spring 52 that this stop pin 51 is suppressed to locking direction; The latch-release parts 53 that form by hard resin shaping thing that make that this stop pin 51 slides on non-locking direction.
The stop pin 51 of this locking device 5; The leading section 51a intercalation in its thin footpath is in pin inserting hole 26,13; This pin inserting hole 26,13 penetratingly is located on ring portion 21 and the tubular pillar 1 of joint component 2 and is communicated with; And the rear end side intercalation of this stop pin 51 keeps in the tube 54 at the spring of hard resin system, and this spring keeps tube 54 to be inlaid on the rearward end of intercalation frame portion 22; Keep the disc spring 52 in the tube 54 through being filled in this spring, this stop pin 51 always forwards is that the locking direction pushing is suppressed.In addition, be formed with the circular layer difference 51b of portion at the root of the leading section 51a of this stop pin 51, and be formed with stopper section 27 in the around openings of the pin inserting hole 26 of joint component 2, this stopper section 27 is the circular layer difference portion relative with this circular layer difference 51b of portion.In addition; Through will being integrally formed in the rectangle board 54a sliding gomphosis of periphery of length direction pars intermedia that spring keeps tube 54 between the fastening groove 22c on the both sides, rear end that are arranged at intercalation frame portion 22 in pairs, 22c, and keep tube 54 to remain in this intercalation frame portion 22 on spring.
The latch-release parts 53 of locking device 5 form the T font by the tabular slide sheet 53a of cocoon shape roughly with the incorporate angle of the back side central portion axial region 53b of this slide sheet 53a; As shown in Figure 5; The 22a of window portion of angle axial region 53b interspersed intercalation frame portion 22 and the slotted hole 32 of pedal 3 from the outside; And press inlay card to fix on the small diameter part 51c of centre of stop pin 51 the furcation 53c of the front of this angle axial region 53b; Thus, slide sheet 53a so that length direction becomes laterally and the form fastening in the outside that is configured in pedal 3 on this stop pin 51.
In addition, on the front surface 3a of pedal 3, on two side positions of each slotted hole 32, paste circular label, thus, show with near a side of tubular pillar 1 as redness circle 6R, will be away from a side of tubular pillar 1 colour-coded as green circle 6G.And this colour-coded shown in Fig. 3 (a), when the slide sheet 53a of locking device 5 is positioned at the latched position near tubular pillar 1, expose green circle 6G, and red circle 6R is hidden in the inboard of slide sheet 53a.On the other hand, shown in Fig. 2 (a), when slide sheet 53a is positioned at from non-locked position that tubular pillar 1 leaves, expose red circle 6R on the contrary, and green circle 6G is hidden in the inboard of slide sheet 53a.
And, as shown in Figure 8 on the back surperficial 3b of the pedal 3 of each shape ladder sections 10, show and make ladder be stretched over the numerical value 7 of the ladder height under the situation of this shape ladder sections 10.The numerical value 7 of the ladder height under this situation is the amplitude with the 0.3m corresponding with the elongation of door shape ladder sections 10 at different levels, has represented the ladder height when subordinate is elongated to this shape ladder sections 10.Promptly; For example; The numerical value 7 of 3.20m among Fig. 8, the door shape ladder sections 10 that is illustrated in than shows this numerical value 7 is positioned at upper door shape ladder sections 10 ... Do not extend and comprise the whole the next door shape ladder sections 10 of the door shape ladder sections 10 that shows this numerical value 7 ... Ladder height under the situation of elongation.
Under the contraction state of the extension ladder of said structure; Shown in Fig. 2 (a), Fig. 2 (b); In the locking device 5 of each shape ladder sections 10; The side butt of the tubular pillar 1 in the door shape ladder sections 10 of the leading section 51a of its stop pin 51 and higher level's side, and its circular layer difference 51b of portion is retained as the state that leaves from the stopper section 27 of joint component 2 sides, slide sheet 53a are configured on the non-locked position that leaves from tubular pillar 1; Thus, expose the promptly red circle 6R of the colour-coded that unlock state is warned.Then; Each shape ladder sections 10 is made progress pulling and makes its elongation; Then in the moment of the elongation (being illustrated as 0.3m) that arrives regulation, shown in Fig. 3 (a), Fig. 3 (b), the stop pin 51 of the locking device 5 in the joint component 2 of the door shape ladder sections 10 of subordinate's side is inserted in the lock hole 11 of bottom of the tubular pillar 1 that penetratingly is located at this shape ladder sections 10; Thereby the door shape ladder sections 10 of the pulling that made progress can not be locked with respect to the door shape ladder sections 10 of subordinate's side up and down.Under this lock-out state; Latch-release parts 53 slide with stop pin 51 one, expose the green circle 6G of the colour-coded of representing lock-out state, but because the circular layer difference 51b of portion of stop pin 51 and stopper section 27 butts of joint component 2 sides; So; The darker insertion of this stop pin 51 is prevented from, and the elastic force of disc spring 52 accepted prevention by stopper section 27, therefore; The angle axial region 53b of latch-release parts 53 is retained the state that leaves from the ora terminalis of the slotted hole 32 of pedal 3, and the load of this elastic force can not act on these latch-release parts 53.
Make the door shape ladder sections 10 of necessary progression extend successively and become under the situation of ladder of specified altitude in use; Carry out visuognosis through colour-coded before use, can confirm easily whether the door shape ladder sections 10 of extending becomes lock-out state really door shape ladder sections 10 at different levels.That is,, just can use ladder safely as long as whole colour-coded of the door shape ladder sections 10 of elongation all is green circle 6G.
Then; Return at the ladder that makes the elongation state after being in use under the situation of contraction state; As shown in Figure 6; Grip through both hands H, H the door shape ladder sections 10 that is in desired height about tubular pillar 1,1 and to erect posture supporting ladder; The palm of these both hands H, H is ridden on the ladder outer fix of ring portion 21 of joint component 2, under this state, thus the slide sheet 53a of the side 3a of the thumb F1 through both hands H, H, F1 pushing pedal 3 and carry out the latch-release operation to the pushing of ladder center side.At this moment; The lower face side of the joint component 2 of the door shape ladder sections 10 of the higher level's side that descends following latch-release; Butt has higher level's carrier 23 of the joint component 2 in the door shape ladder sections 10 in this operating process; Thus, at the pedal 3 of neighbouring door shape ladder sections 10,10, be formed with the clearance t 1 of anti-tong between 3, and also be formed with the clearance t 2 of anti-tong between the ladder outside portion in the ring portion 21,21 of joint component 2,2 up and down.
Therefore; Even carrying out operator's mistake of the shrinkage operation of ladder is placed on finger on the pedal 3 of the door shape ladder sections 10 in the latch-release operating process; Owing to can avoid banjo splint between the pedal 3 of the door shape ladder sections 10 of higher level's side of this pedal 3 and decline; Even the both hands H of the tubular pillar about gripping 1,1, the forefinger F2 of H or middle finger F3 ride over as illustrating on the ring portion 21 of joint component 2; These forefingers F2 and middle finger F3 can not be sandwiched in two ring portions 21 yet, between 21, can operate safely and efficiently.
In addition; Especially as the enforcement mode; The clearance t 2 of the anti-tong that the ring portion of neighbouring joint component 2,2 is 21,21 is formed in embodiment in the roughly half cycle scope in the ladder outside in this ring portion 21, but also can be formed in the scope in 1/3 week outside the ladder at least in this ring portion 21; If it is narrow that this forms the zone, the situation of then clamping forefinger F2 or middle finger F3 easily.In addition; Under the situation of stretching out along the circumference of ring portion 21 with mode that corner angle are arranged at the width two ends at the top of higher level's carrier 23; According to the both hands H that grips tubular pillar 1,1, the position of H; Also exist part between the root of the part of palm, especially thumb F1 and forefinger F2 to be sandwiched in the small possibility between the soffit of joint component 2 of vertex angle part and higher level's side of this higher level's carrier 23; But as the enforcement mode, form from the both ends of the 20a of gap formation portion of anti-tong through upside periphery 20 and to be the upwards rake 20b of gradient, can get rid of above-mentioned possibility of being pressed from both sides fully to higher level's carrier 23 with this ring portion 21.
On the other hand; As the locking device on the joint component that is assembled in each shape ladder sections 10 25; Can adopt various locking mechanisms; But in the structure that as the enforcement mode, constitutes by stop pin 51, spring members (disc spring 52) and latch-release parts 53, the advantage that has textural simple and reliable in action and can easily make and assemble with low cost.In addition, in illustrative locking device 5, under lock-out state; The circular layer difference 51b of portion of stop pin 51 and stopper section 27 butts of joint component 2 sides, the elastic force of spring members does not apply load to latch-release parts 53, therefore; These latch-release parts 53 are difficult to come off or damage from stop pin 51, can correspondingly obtain good durability as locking device 5, and; Even latch-release parts 53 come off from stop pin 51 or situation about damaging under; Because this stop pin 51 does not get in tubular pillar 1 more deeply, therefore, have through changing the advantage that stop pin 51 can easily be repaired locking device 5.In addition, be not limited to the such slidingtype that moves with stop pin 51 one of illustration, also can adopt other the mode such as rod-type of rotating as latch-release parts 53.In addition, the stopper section 27 of the circular layer difference 51b of portion of stop pin 51 and joint component 2 sides also can be the structure at the rear portion side butt of this stop pin 51.
As showing the lock-out state of locking device 5 and the colour-coded of latch-release state with different tones; Be not limited to embodiment such green circle 6G that passes through adhesive label and red circle 6R; For example; Can also print to the side of pedal 3, or come the painted demonstration of visuognosis stop pin itself or slide integratedly with this stop pin or the painted demonstration of the part that interlock rotates from the window portion on the pedal 3 of being located at.In addition, the tone of colour-coded, form, display position are enough set for various.
Be presented at the numerical value 7 of the ladder height on the side of pedal 3 of each shape ladder sections 10; The door shape ladder sections 10 that expression makes all subordinate's sides of comprising this shape ladder sections 10 in embodiment is the ladder height under the situation of elongation all; On the contrary, the door shape ladder sections 10 that also can represent to make all higher level's sides of comprising this shape ladder sections 10 is the ladder height under the situation of elongation all.But, as the method for using of extension ladder, because it is less and dangerous to ride near the situation of the enterprising line operate of pedal the top of ladder; And, can not guarantee the foothold near on the ground, can produce obstruction to upper and lower action in the mode of the door shape ladder sections 10 of the residual multistage not elongation of ladder lower side; Therefore; Preferably,, recommend the method for expressing of the such ladder height of embodiment for this respect in the door shape ladder sections 10 of the residual not elongation of ladder upper side.
In addition; Extension ladder of the present invention; For the progression of door shape ladder sections 10, in the joint component 2 ring portion 21 with respect to the structure of the fixed form of tubular pillar 1, intercalation frame portion 22 and with respect to the fixed form of pedal 3, in the locking device 5 latch-release parts 53 form and with respect to the structure of the detail sections such as latching structure of stop pin 51, can beyond embodiment, carry out various design alterations.
Claims (6)
1. extension ladder; A plurality of the shape ladder sections that the pedal of tubular will be between the upper end of pair of right and left tubular pillar be arranged through the joint component crossbearer; Be configured to multistagely up and down so that the tubular pillar is the chimeric mode of bushing type each other, and this joint component or the pedal door shape ladder sections that is built-in with the higher level's side when ladder stretched remains the locking device that can not go up and down, and the latch-release operating portion of this locking device exposes to the lateral outer of the left and right sides of pedal; It is characterized in that
Said joint component be by outer build-in fix on the upper end of tubular pillar ring portion, extend and from the intercalation frame portion of openend intercalation in this pedal of pedal, intercalation frame portion outstanding integrated the forming of higher level's carrier in side direction top from this ring portion to the side from this ring portion
The lower face side butt of the joint component in the door shape ladder sections of higher level's side of said higher level's carrier and contraction; Thus; When ladder shrinks; Between neighbouring door shape ladder sections pedal each other and between the ladder outside portion in the ring portion at joint component, constitute the gap of anti-tong respectively.
2. extension ladder as claimed in claim 1; It is characterized in that; The gap of the said anti-tong between the ring portion of joint component is formed in 1/3 all scopes in the outside of ladder at least in this ring portion, and the upside periphery of this ring portion is upwards gradient from the gap formation portion that prevents tong to said higher level's carrier.
3. according to claim 1 or claim 2 extension ladder; It is characterized in that said locking device is by constituting with lower component: insertion penetratingly is located at the stop pin in the lock hole of lower side of the tubular pillar in the door shape ladder sections of higher level's side of stretching, extension under lock-out state; The spring members that this stop pin is suppressed to locking direction; Be fastened on this stop pin and make the latch-release parts of the said latch-release operating portion of conduct that this stop pin slides to non-locking direction.
4. extension ladder as claimed in claim 3 is characterized in that, said stop pin has the circular layer difference portion in the face of locking direction, on said joint component, be formed with and this relative stopper section of circular layer difference portion,
Under the lock-out state of this stop pin, through the butt of said circular layer difference portion and stopper section, stop pin is restricted to the insertion length of said lock hole, and the elastic force of said spring members does not apply load to the latch-release parts.
5. like each the described extension ladder in the claim 1 to 4, it is characterized in that, constitute, on the side of the pedal of each shape ladder sections, show the lock-out state and the latch-release state of said locking device with the colour-coded of different tones.
6. like each the described extension ladder in the claim 1 to 5, it is characterized in that, on the side of the pedal of each shape ladder sections, show the numerical value of the ladder height when being stretched over this shape ladder sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105339273A CN102465662A (en) | 2010-10-29 | 2010-10-29 | Telescoping ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105339273A CN102465662A (en) | 2010-10-29 | 2010-10-29 | Telescoping ladder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102465662A true CN102465662A (en) | 2012-05-23 |
Family
ID=46069742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105339273A Pending CN102465662A (en) | 2010-10-29 | 2010-10-29 | Telescoping ladder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102465662A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555548A (en) * | 2015-09-25 | 2017-04-05 | 科尔销售有限责任公司 | Telescopic ladder with maintaining body |
| WO2017174602A1 (en) * | 2016-04-04 | 2017-10-12 | Telesteps Ab | An improved rung for a collapsible ladder |
| EP3613936A4 (en) * | 2017-04-20 | 2021-01-20 | Dongguan Prestige Sporting Products Co., Ltd. | LADDER UPRIGHT LOCKING DEVICE FOR SLIDING LADDER |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040195043A1 (en) * | 2001-06-13 | 2004-10-07 | Kjell Johansson | Collapsible ladder |
| CN2804355Y (en) * | 2005-06-24 | 2006-08-09 | 杨洪建 | Telescopic ladder |
| CN200985736Y (en) * | 2006-12-15 | 2007-12-05 | 王万兴 | Telescopic ladder having anti-hand clipping mechanism |
| CN201495980U (en) * | 2009-09-21 | 2010-06-02 | 应筱萍 | Telescopic ladder capable of preventing hands from clamping |
| US20100270106A1 (en) * | 2006-03-10 | 2010-10-28 | Mei-Hua Chen | Securing device for extending ladder |
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- 2010-10-29 CN CN2010105339273A patent/CN102465662A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040195043A1 (en) * | 2001-06-13 | 2004-10-07 | Kjell Johansson | Collapsible ladder |
| CN2804355Y (en) * | 2005-06-24 | 2006-08-09 | 杨洪建 | Telescopic ladder |
| US20100270106A1 (en) * | 2006-03-10 | 2010-10-28 | Mei-Hua Chen | Securing device for extending ladder |
| CN200985736Y (en) * | 2006-12-15 | 2007-12-05 | 王万兴 | Telescopic ladder having anti-hand clipping mechanism |
| CN201495980U (en) * | 2009-09-21 | 2010-06-02 | 应筱萍 | Telescopic ladder capable of preventing hands from clamping |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555548A (en) * | 2015-09-25 | 2017-04-05 | 科尔销售有限责任公司 | Telescopic ladder with maintaining body |
| CN106555548B (en) * | 2015-09-25 | 2020-04-21 | 科尔销售有限责任公司 | Telescopic ladder with retaining mechanism |
| WO2017174602A1 (en) * | 2016-04-04 | 2017-10-12 | Telesteps Ab | An improved rung for a collapsible ladder |
| US10718161B2 (en) | 2016-04-04 | 2020-07-21 | Telesteps Ab | Rung for a collapsible ladder |
| EP3613936A4 (en) * | 2017-04-20 | 2021-01-20 | Dongguan Prestige Sporting Products Co., Ltd. | LADDER UPRIGHT LOCKING DEVICE FOR SLIDING LADDER |
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Application publication date: 20120523 |