CN202970427U

CN202970427U - Locking device for telescopic leg of ladder shaped supporting leg

Info

Publication number: CN202970427U
Application number: CN 201220654891
Authority: CN
Inventors: 小林拓也
Original assignee: AROKU INYASU Co Ltd
Current assignee: AROKU INYASU Co Ltd
Priority date: 2012-11-26
Filing date: 2012-11-26
Publication date: 2013-06-05
Anticipated expiration: 2022-11-26

Abstract

The utility model provides a locking device for a telescopic leg, which can definitely fix the telescopic leg (4) on a supporting post body (2). The locking device comprises the following components: a rack (8), a locking component (11), an operating component (15), a spring (16) and a clamping layer difference part (18), wherein the rack (8) is arranged on the telescopic leg (4), the locking component (11) is mounted at the side of a lower side pedal through a pivot and provided with a tooth (9) meshed with the rack (8), a recess part (10) which is opened downwards is formed at the back part of the tooth (9), the operating component (15) is borne at the end part of the pedal (3) in a manner of being capable of advancing, retreating and moving along the length direction of the pedal (3) and being capable of being lifted, a protruded body (14) which is composed of a high protruded part (12) and a lower protruded part (13) is arranged at the front end part of the operating component (15), the high protruded part (12) protrudes to the recess part (10) of the locking component (11), the lower protruded part is located at a lower position in comparison with the high protruded part, the spring (16) elastically presses the operating component (15) in a heading direction in a manner of keeping a locking position at which the tooth (9) of the locking component (11) is clamped with the rack (8), and the clamping layer difference part (18) causes the low protruded part (13) of the protruded body (14) to be arranged at the lower surface side of the end part of the pedal (3) in a clamped manner when the operating component (15) is in a forward lean state.

Description

The Retractive leg locking device of ladder shape supporting leg

Technical field

The utility model relates to the supporting leg (hereinafter referred to as ladder shape supporting leg) that makes step stool, ladder, operation post etc. flexible and, Retractive leg locking device ladder shape supporting leg fixing with the leg length of regulation.

Background technology

As the Retractive leg locking device of in the past ladder shape supporting leg, the device that known for example following patent documentation 1 is put down in writing.As Figure 11 roughly as shown in, in this patent documentation 1, the Retractive leg locking device of record is the leg length stationary device of Retractive leg 4 to stipulate with ladder shape supporting leg, this ladder shape supporting leg is by the pedal 3 willfully of multilayer ground, up and down between the

pillar

2,2 of pair of right and left, and above-mentioned Retractive leg 4 is formed in the bottom of each pillar 2 with the mode intercalation that can slide, this Retractive leg locking device is by consisting of as lower component: be arranged on the tooth bar 8 on Retractive leg 4; Lock Part 11 is pivotally mounted in the end of lower layer side pedal 3, has the tooth 9 with tooth bar 8 engagement, and has the recess section 10 of downwardly facing opening at the back of this tooth 9; Functional unit 21, at the leading section of above-mentioned pedal 3 can be only to be supported in the mode of the mobile fixed journey system of advance and retreat under the flat-hand position of tread length direction, and having prominent shape sheet 29 at leading section, this prominent shape sheet 29 is charged into to the recess section 10 of Lock Part 11 from the below; With helical spring 22, be installed between the end of this functional unit 21 and above-mentioned pedal 3, and so that the mode that the tooth 9 of Lock Part 11 engages with tooth bar 8 functional unit 21 forward direction are suppressed.

Figure 11 (a) expression functional unit 21 suppressed by helical spring 22 forward direction, and the lock-out state that engaged with tooth bar 8 of the tooth 9 of Lock Part 11.If in the mode of opposing helical spring 22 elastic force pressures, functional unit 21 direction of drawing back is pulled as shown in (b) from this lock-out state, via prominent shape sheet 29, Lock Part 11 is rotated in the mode that rotates counterclockwise shown in this figure, and tooth 9 is broken away from from tooth bar 8, thereby become the latch-release state

Under this latch-release state, Retractive leg 4 can slide with respect to support-column main body 2.If under the latch-release state shown in this (b), make functional unit 21 repositions, become the lock-out state shown in (a), Retractive leg 4 is fixed with respect to support-column main body 2.

Technical literature formerly

Patent documentation 1: TOHKEMY 2009-121130 communique

In Retractive leg locking device as described above, Retractive leg 4 is, so-called monolock fixed structure cofree at bearing of trend, thus, if applied operation or impact as step stool etc. is moved up and down and so on tempestuously when mobile, Retractive leg 4 may be because deadweight stretches, also might be when carrying step stool etc., in the situation that the end pieces of Retractive leg 4 partly waits and contacts with other article etc., Retractive leg 4 also can stretch.Figure 11 (c) represents the stretching due to such Retractive leg 4, the state that Lock Part 11 is unlocked to the rotation of latch-release direction.

The utility model content

In view of above-mentioned problem, the purpose of this utility model is, even a kind of operation or impact that step stool etc. is moved up and down and so on tempestuously that applied when mobile step stool etc. is provided, perhaps occured from step stool etc. is loaded in state on vehicle etc. with the multilayer shape, Retractive leg is pulled out such action, Retractive leg can not stretch yet, thereby can be with Retractive leg with respect to the support-column main body Retractive leg locking device of fixing ladder shape supporting leg positively.

If mark the reference marker of embodiment described later, the scheme that is used for solving above-mentioned problem is described,

Technical scheme one is a kind of Retractive leg locking device of ladder shape supporting leg, it is multilayer between two

pillars

2,2 ground crossbearer to be had pedal 3 and the described Retractive leg 4 of ladder shape supporting leg that Retractive leg 4 intercalation is sliding freely formed in the bottom of each pillar 2, with the fixing Retractive leg locking device of regulation leg length, it is characterized in that

By consisting of as lower component: be arranged on the tooth bar 8 on Retractive leg 4; Lock Part 11 is pivotally mounted in the end of lower layer side pedal 3, has the tooth 9 with tooth bar 8 engagement, and has recess section 10 in the back of tooth 9 side; Functional unit 15, support in the mobile mode of can advancing and retreat along pedal 3 length directions in described pedal 3 sides, and can lifting on progressive position, described functional unit 15 has the protuberant shape body that is made of high protruding part 12 and low protruding part 13 at leading section, described high protruding part 12 is charged into to described recess section 10 from the below, and described low protruding part 13 is compared with described high protruding part 12 and is positioned on lower position; Spring 16 is so that the mode that Lock Part 11 maintains on latched position is suppressed functional unit 15 forward direction; With the poor section 18 of engaging layer, so that the mode of low protruding part 13 engagings of the protuberant shape body 14 of the functional unit 15 of toe lateral lifting is arranged on described pedal 3 sides, described Retractive leg locking device is by retreating functional unit 15, unlock and via high protruding part 12, Lock Part 11 is rotated, when Lock Part 11 is positioned at latched position, boost by the toe lateral with functional unit 15, and low protruding part 13 engagings that make protuberant shape body 14 are in described engaging layer poor section 18, thereby with Lock Part 11 double locking.

technical scheme two is, in the Retractive leg locking device of ladder shape supporting leg described according to technical scheme 1, it is characterized in that, the front inner wall face 10a that the recess section 10 of described Lock Part 11 has from the nearly side of tooth 9, with the rear inside wall face 10b relative with this front inner wall face, front and back two

internal face

10a, 10b forms the shape that is inclined upwardly on the direction that approaches to tooth 9, near the bottom of front inner wall face 10a and the inlet portion that is formed on recess section 10, be the lead-in chamfered 11a of the section adjacency of downward-sloping shape on the direction that approaches to tooth 9, and be in during for flat-hand position at functional unit 15 under the state of guiding projecting strip part p on the front face side bottom that makes the outstanding high protruding part 12 that is arranged on protuberant shape body 14 and the described downward-sloping shape lead-in chamfered 11a of section Elastic Contact, boost by the toe lateral with functional unit 15, and make guiding projecting strip part p from the downward-sloping shape lead-in chamfered 11a of section cross with recess section 10 in the boundary portion 11o of the shape front inner wall face 10a that is inclined upwardly, and move to the front inner wall face 10a of described recess section.

Technical scheme three is, in the Retractive leg locking device of ladder shape supporting leg described according to technical scheme 1 or 2, it is characterized in that, described Lock Part 11, functional unit 15 and spring 16 are assembled in lock box 19 in the end that is mounted on described pedal 3, and described engaging layer poor section 18 is arranged on the bottom of this lock box 19.

technical scheme four is, Retractive leg locking device at ladder shape supporting leg described according to technical scheme 3, it is characterized in that, be arranged on the engaging layer poor section 18 of bottom of described lock box 19 by being formed on from described tooth bar 8 to horizontal direction apart from the locational first poor 18a of section of engaging layer of specific length, with the next side of the first poor 18a of section of engaging layer from described tooth bar 8 to away from direction form stair-stepping the second poor 18b of section of engaging layer poor 18a of section of these two engaging layers at least, 18b and consisting of, in the medial surface of the pillar 2 at least two kind ladder shape supporting legs different from the relative angle of the upper side of pedal 3, a side little in angle uses the first poor 18a of section of engaging layer, a side large in angle uses the second poor 18b of section of engaging layer.

The utility model effect

if mark the reference marker of embodiment described later, utility model effect to above-mentioned solution describes, according to the utility model of technical scheme one, when Lock Part 11 is positioned at latched position, boost by the toe lateral with functional unit 15, and low protruding part 13 engagings that make protuberant shape body 14 are in the engaging layer of described pedal 3 sides poor section 18, rotation stopping with Lock Part 11, and with Lock Part 11 double locking on latched position, owing to consisting of in this wise, even so be applied with operation or the impact that step stool etc. is moved up and down and so on tempestuously when mobile, perhaps occured Retractive leg 4 is loaded in the multilayer shape action that the state on vehicle etc. is pulled out from step stool etc., can not make the unexpected stretching of Retractive leg 4 yet, thereby can make Retractive leg positively fixing with respect to pillar 2.

in addition, only by with functional unit 15 from double locking the state of Lock Part 11, with the mode of the elastic force pressure of antagonistic spring 16 to from tooth bar 8 away from direction pull, will make functional unit 15 want to be back to original posture and protuberant shape body 14 is descended, make simultaneously this low protruding part 13 from poor section 18 disengaging of engaging layer and the double locking of Lock Part 11 is removed, and, because the mode of rotating with the direction that Lock Part 11 is left by the high protruding part 12 that is positioned at recess section 10 at its tooth 9 from tooth bar 8 unlocks, so the operation of the latch-release of double locking state is also very simple, in addition, after this latch-release, if hand is decontroled from functional unit 15, functional unit 15 is based on the elastic force pressure of spring 16 and the movement of advancing, thereby can make Lock Part 11 become common lock-out state (monolock is decided state).

Utility model according to technical scheme two, functional unit 15 is positioned at common latched position at Lock Part 11, is the monolock timing, can effectively keep parallel posture, and, after making functional unit 15 become forward lean, the guiding projecting strip part p of protuberant shape body 14 on the direction that approaches to tooth 9 with the front inner wall face 10a Elastic Contact of the shape that is inclined upwardly, thus, only however with functional unit 15 to from tooth bar 8 away from direction pull, just can not remove double locking, safety.In addition, when guiding projecting strip part p cross the top of the downward-sloping shape lead-in chamfered 11a of section, namely with the boundary portion 10o of the front inner wall face 10a of the shape that is inclined upwardly, and the shape front inner wall face that the is inclined upwardly 10a in the recess section 10 are when moving, the striking sense (sending click) of appropriateness can be produced on functional unit 15, the double locking state of Lock Part 11 can be confirmed thus.

Utility model according to technical scheme three, Lock Part 11, functional unit 15 and spring 16 are assembled in lock box 19 in the end that is mounted on pedal 3, the poor section 18 of engaging layer is formed on the bottom of lock box 19, lock box 19 is arranged on pedal 3 gets final product, therefore, become simple and easily with respect to the setting of the Retractive leg locking device of pedal 3.

utility model according to technical scheme four, be arranged on the engaging layer poor section 18 of bottom of lock box 19 by being formed on from described tooth bar 8 to horizontal direction apart from locational the first poor 18a of section of engaging layer of specific length, with the next side of the first poor 18a of section of engaging layer from described tooth bar 8 to away from direction form stair-stepping the second poor 18b of section of engaging layer poor 18a of section of these two engaging layers at least, 18b consists of, in the medial surface of the pillar 2 at least two kind ladder shape supporting legs different from the relative angle of the upper side of pedal 3, a side little in angle uses the first poor 18a of section of engaging layer, a side large in angle uses the second poor 18b of section of engaging layer.In this case, the Retractive leg locking device of the utility model of technical scheme three can be used in two kinds of ladder shape supporting legs by a kind of component parts at least, thus cheapization that can seek cost.

Description of drawings

Fig. 1 means the stereogram of the step stool that is also used as ladder.

Fig. 2 means the front view of the Retractive leg locking device of the present utility model in the step stool that is applicable to Fig. 1.

Fig. 3 (a) is the A-A line sectional view of Fig. 2, and Fig. 3 (b) is the B-B line sectional view of Fig. 2.

Fig. 4 (a) means the front view of Lock Part, and Fig. 4 (b) is lateral view.

Fig. 5 (a) is the front view of lock box, and Fig. 5 (b) is left view, and Fig. 5 (c) is upward view.

Fig. 6 (a) is the front view of functional unit, and Fig. 6 (b) is left view, and Fig. 6 (c) is right view, and Fig. 6 (d) is top view, and Fig. 6 (e) is upward view, and Fig. 6 (f) is the C-C sectional view of (b).

Fig. 7 (a)～(d) is the key diagram that the effect to the same Retractive leg locking device describes.

Fig. 8 (a) is the enlarged drawing by part shown in the arrow D of Fig. 7 (a), and Fig. 8 (b) is the enlarged drawing by part shown in the arrow E of Fig. 7 (c).

Fig. 9 (a) means the front view of the part of extension ladder, Fig. 9 (b) is its lateral view, Fig. 9 (c) is the enlarged drawing by part shown in the arrow F of Fig. 9 (a), means the front view of the Retractive leg locking device of the present utility model that is applicable to this extension ladder.

Figure 10 (a) means by the same Retractive leg locking device and makes Lock Part by the key diagram of the state of double locking, and Figure 10 (b) is the enlarged drawing by part shown in the arrow G of Figure 10 (a).

Figure 11 (a)～(c) is the key diagram that the effect in the past Retractive leg locking device describes.

Description of reference numerals

1 step stool

2 pillars

3 pedals

3A orlop pedal

4 Retractive legs

5 ladder shape supporting legs

7 Retractive leg locking devices

8 tooth bars

9 teeth

10 recess sections

10a front inner wall face

10b rear inside wall face

11 Lock Parts

The high protruding part of 12 protuberant shape bodies

The low protruding part of 13 protuberant shape bodies

14 protuberant shape bodies

The guiding projecting strip part of p protuberant shape body

15 functional units

16 helical springs

18 engaging layer poor section

18a the first engaging layer poor section

18b the second engaging layer poor section

19 lock box

The specific embodiment

Below, describe being suitable for an embodiment of the present utility model with reference to the accompanying drawings.Fig. 1 represents to be also used as the step stool 1 of ladder, and Fig. 2 represents to be arranged on the Retractive leg locking device on step stool 1.this step stool 1 is by being formed as follows: expand the hollow form pillar 2 of the pair of right and left of shape configuration what be made of the aluminum extrudate with end, between 2, multilayer ground crossbearer has the hollow form pedal 3 that is made of the aluminum extrudate equally, and with Retractive leg 4 with the mode intercalation that can the slide bottom at each pillar 2, form thus ladder shape supporting leg 5, and pass through two ladder shape supporting legs 5, 5 upper end is carried out the pivot suspension link and is formed this step stool 1 with rotating metallic spare 6 each other, pillar 2 bottoms at each ladder shape supporting leg 5, between the end of undermost pedal 3A and Retractive leg 4, be provided with for each Retractive leg 4 being fixed as the Retractive leg locking device 7 of regulation leg length.As shown in Figure 2, the relative angle of pillar 2 medial surfaces of ladder shape supporting leg 5 and pedal 3 upper sides is for example 85 °.In addition, in the lower end of the pillar 2 of ladder shape supporting leg 5, end cap 35 is installed.In addition, in Fig. 1, represent a side's of each ladder shape supporting leg 5 Retractive leg 4 with contraction state, represent the opposing party's Retractive leg 4 with extended state.

as shown in Figures 2 and 3, this Retractive leg locking device 7 is by consisting of as lower component: be arranged on the tooth bar 8 on Retractive leg 4, Lock Part 11 is pivotally mounted in the end of lower layer side pedal 3, and has the tooth 9 with tooth bar 8 engagement, and has the contrary U font recess section 10 of downwardly facing opening at the back of this tooth 9, functional unit 15, in the end of above-mentioned pedal 3 to support in can the advance and retreat mode of mobile fixed journey system of flat-hand position on pedal 3 length directions, and can make the toe lateral lifting on progressive position, this functional unit 15 has the protuberant shape body 14 that is made of high protruding part 12 and low protruding part 13 at leading section, this high protuberant shape body 12 is charged into to the recess section 10 of Lock Part 11 from the below, and this low protruding part 13 is compared with this high protruding part 12 and is positioned on lower position, helical spring 16 is installed between the rear portion side and above-mentioned pedal 3 ends of this functional unit 15, and the mode of the latched position that engages with tooth bar 8 with the tooth 9 of keeping Lock Part 11, and functional unit 15 forward direction are suppressed, with the poor section 18 of engaging layer, be arranged on above-mentioned pedal 3 sides, so that toe lateral lifting and become low protruding part 13 engagings of protuberant shape body 14 of the functional unit 15 of forward lean, the high protruding part 12 of protuberant shape body 14 is charged into usually to the recess section 10 of Lock Part 11, by functional unit 15 is retreated, and Lock Part 11 is rotated so that its tooth 9 breaks away from from tooth bar 8 via high protruding part 12, thereby unlock, and by when Lock Part 11 is positioned at latched position, the toe lateral of functional unit 15 is boosted and becomes forward lean, thereby low protruding part 13 engagings that make protuberant shape body 14 are in the engaging layer poor section of above-mentioned pedal 3 end side, and with Lock Part 11 double locking on latched position.

If the structure to above-mentioned Retractive leg locking device 7 illustrates further, as shown in Figures 2 and 3, the end of orlop pedal 3A is under the state that makes its end face near the medial surface of pillar 2, and under the state in a pair of

carriage

37,37 in the both sides on being held on the two sides that are arranged on pillar 2 with

rivet

38,38, be fixed on pillar 2 by rivet shaft 20 described later, 40.In addition, end at orlop pedal 3A, lateral incision has lock box to install with peristome 39 (with reference to Fig. 3) in its lower section, the end portion that is inserted in the lock box 19 in the end of this pedal 3A is outstanding downwards from this peristome 39, and lock box 19 is fixed in pedal 3A by above-mentioned

rivet shaft

20,36,40.

As shown in (a), (b) and Fig. 5 of Fig. 3 (a)～(c), lock box 19 consists of and comprises: upper wall portions 30; The upper portion

side wall section

31,31 that both sides are a pair of, respectively to downward-extension, and relative spacing is wider from the two side ends of this upper wall portions 30; With a pair of

lower sides section

33,33 in both sides, from the lower end of this upper portion

side wall section

31,31 via inside

inclined wall portion

32,32 and to downward-extension, and relative spacing is narrower, the bottom 33a of each lower sides section 33 forms the inside L font in cross section, and the leading section of the bottom 33a of inside L font cuts the engaging layer poor section 18 of being formed with in this cross section.The poor section 18 of this engaging layer is made of two the poor 18a of section of engaging layer, 18b at least, the first poor 18a of section of engaging layer is arranged in lock box 19 under state on the end of orlop pedal 3A, be positioned at from tooth bar 8 to horizontal direction on the position apart from specific length, the second poor 18b of section of engaging layer is in the next side of the poor section of this first engaging layer, to from described tooth bar 8 away from direction form stepped, the poor 18a of section of these engaging layers, 18b as described later, in the situation that pillar 2 and the different difference use of the setting angle of pedal 3.

And, as (b) of Fig. 5 and (c), the rearward end of bottom 33a, the 33a of the

lower sides section

33,33 that both sides are a pair of is by linking part sheet 34 and one links, the outstanding spring support 41 that is provided with the rearward end side of the above-mentioned helical spring 16 of supporting on this linking part sheet 34, in addition, each inner face top in

lower sides section

33,33, be formed with the

guide rail

42,42 of cross section L font, this

guide rail

42,42 supports functional unit 15 in the mode of can slide and can boost on the tread length direction.In addition, in each upper portion side wall section 31, be provided with for above-mentioned

rivet shaft

36,20,40 inserting holes 43,44,45 that intert.

As shown in Fig. 4 (a), (b), Lock Part 11 has: hole 47, can intert for the Lock Part support column 46 (with reference to Fig. 3 (a)) that is embedded in outward on above-mentioned rivet shaft 36; A plurality of teeth 9 are with above-mentioned tooth bar 8 engagements; Recess section 10, so that the mode that the protuberant shape body 14 of functional unit 15 is charged into to the rear side suitable section of these teeth 9 forms, and under shed; With the prominent shape sheet 17 in rear portion, form along the rear inside wall face 10b of this recess section 10.

In addition, as shown in Fig. 4 (a), the recess section 10 of Lock Part 11 has from the front inner wall face 10a of the nearly side of tooth 9 and the rear inside wall face 10b relative with this front inner wall face 10a almost parallel ground.Front and back two

internal face

10a, 10b are forming the shape that is inclined upwardly on the direction that approaches to tooth 9, and, the bottom of front inner wall face 10a and the lead-in chamfered 11a of section adjacency, this lead-in chamfered 11a of section is formed on the inlet portion of recess section 10 and is downward-sloping shape on the direction that approaches to tooth 9 in the lower surface of Lock Part 11 side.In figure, the boundary portion (top of the lead-in chamfered 11a of section of downward-sloping shape) of the front inner wall face 10a that represents recess section 10 with Reference numeral 10o and the lead-in chamfered 11a of section of the downward-sloping shape in the outside that is positioned at recess section 10.

As Fig. 2, Fig. 3, Figure 6 and Figure 7, functional unit 15 at one end section's (leading section) has the protuberant shape body 14 of charging into from the below to the recess section 10 of Lock Part 11, distolaterally has a helical spring maintaining part 48 that compression helical spring 16 is kept at another.As shown in Fig. 6 (a)～(f), the protuberant shape bodies 14 of charging into to the recess section 10 of Lock Part 11 consist of and comprise: a pair of low protruding

part

13,13 that is positioned at its both ends, left and right in an end (front end) side of functional unit 15; And between two low protruding

parts

13,13 and compare with low protruding part 13 the high protruding part 12 of giving prominence to, and protuberant shape body 14 is provided with along the left and right horizontal direction with being strip and guides projecting strip part p on the front face side bottom of this high protruding part 12 with exceeding one deck.

in addition, as shown in Fig. 6 (a)～(f), be provided with a pair of abutment wall in both sides 49 in the part from the protuberant shape body 14 of functional unit 15 leading sections to helical spring maintaining part 48, 49, the abutment wall 49 that these both sides are a pair of, 49 with across the both end sides of high protruding part 12 and the mode that forms the two side of helical spring maintaining part 48 extend continuously, in this two abutment wall 49, 49 upper end is formed with supporting guiding piece 50, 50, this supports guiding piece 50, 50 lower sides sections 33 being formed at lock box 19, guide rail 42 on 33 inner surface top, the mode of sliding on 42 and can boost supports.In addition, be provided with handle in the bottom of functional unit 15 with protruding layer difference section 51, at the front end face of this protruding layer difference section 51, namely on the end face of a side relative with tooth bar 8, handle section 52 forms concave shape, on the soffit of this handle with protruding layer difference section 51, with the direction of the glide direction quadrature of functional unit 15 on be provided with the jog 53 of anti-skidding use with being strip, in addition, on the two sides of handle with protruding layer difference section 51, be formed with to upward arrow mark 54 operation that expression boosts the toe lateral of functional unit 15.

when the component parts that carries out above-mentioned Retractive leg locking device 7, it is Lock Part 11, functional unit 15, during the assembling of compression helical spring 16 and lock box 19, at first, front configuration locking parts 11 in lock box 19, in addition, (a) as Fig. 3, (b) shown in, to take in the functional unit 15 of compression helical spring 16 in helical spring maintaining part 48, supporting guiding piece 50 via functional unit 15 sides, 50 and the guide rail 42 of lock box 19 sides, 42, be arranged on the bottom of lock box 19 in the mode that can slide, and, the high protruding part 12 of the protuberant shape body 14 of functional unit 15 is charged into to the recess section 10 of Lock Part 11.

in addition, by Fig. 2, Fig. 3, Fig. 5 and Fig. 6 are as can be known, helical spring 16 is accommodated in the helical spring maintaining part 48 of functional unit 15 in the integral body of spring 16, and be inserted into the lower sides section 33 of lock box 19, under state between 33, make end wall 48a in an end of helical spring 16 and helical spring maintaining part 48 (with reference to (a) of Fig. 6, (d), (f)) butt supporting, and, make the other end of helical spring 16 become to be embedded into state that the mode on the spring support 41 of lock box 19 sides keeps (with reference to Fig. 3 (b), Fig. 5 (c)).

the lock box 19 of functional unit 15 will as above be installed in the bottom like that, be inserted in the end of orlop side pedal 3A, and, the lock box of the bottom of lock box 19 and functional unit 15 side below pedal 3A end is installed with under the outstanding state of peristome 39, the mode in the hole 47 of the rivet inserting hole 43 of the upper portion side wall section 31 that the rivet shaft 36 of the outer embedding of Lock Part support column 46 (with reference to Fig. 3 (a)) is arrived lock box 19 with the rivet inserting hole (omitting diagram) from pedal 3A and Lock Part 11 is interted and fastening, thus, Lock Part 11 is pivotally mounted on lock box 19, and, make rivet shaft 20, the 40 rivet inserting holes 44 with the upper portion side wall section 31 that arrives lock box 19 from the rivet inserting hole of carriage 37 and pedal 3A (omitting diagram), 45 mode is interted and is fastening, thus, complete the assembling of above-mentioned Retractive leg locking device 7.

Complete in this wise Retractive leg locking device 7 under the state of assembling as Fig. 2, Fig. 3, Fig. 7 and shown in Figure 8, but in the state shown in these figure, Lock Part 11 is embedded in beyond being centered by Lock Part support column 46 (with reference to Fig. 3 and Fig. 8) on rivet shaft 36 and freely rotates, usually, as shown in Fig. 7 (a) and Fig. 8 (a), pushed by the protuberant shape body 14 of the functional unit 15 that is suppressed by compression helical spring 16 forward direction, thereby remain on the latched position of tooth bar 8 engagements that make tooth 9 and Retractive leg 4.At this moment, owing to being positioned at the guiding projecting strip part p that charges into to the front face side bottom of the high protruding part 12 of the protuberant shape body 14 of the recess section 10 of Lock Part 11, as shown in Fig. 8 (a) with the lead-in chamfered 11a of the section Elastic Contact of the downward-sloping shape of the back side that is formed on Lock Part 11, so functional unit 15 can be kept flat-hand position effectively under the state of supporting guiding piece 50 by guide rail 42 (with reference to Fig. 3) supporting.

when the lock-out state of the parts 11 that unlock, as shown in Fig. 7 (b), if hand is placed on the handle that is formed on functional unit 15 with in the handle section 52 in protruding layer difference section 51, and the mode of functional unit 15 with the elastic force pressure of opposing compression helical spring 16 pulled to the direction (with the direction of arrow of figure) away from tooth bar 8, charge into the high protruding part 12 of the protuberant shape body 14 of the functional unit 15 to the recess section 10 of Lock Part 11, rear inside wall face 10b with recess section 10, be prominent shape sheet 17 butts in rear portion of Lock Part 11, and this Lock Part 11 is rotated in the mode that rotates counterclockwise shown in Fig. 7 (b), tooth 9 is broken away from from tooth bar 8, and the locking of the parts 11 that unlock.After this latch-release, if the handle section 52 of hand from functional unit 15 decontroled, functional unit 15 is keeping due to the elastic force pressure of helical spring 16 movement of advancing under the state of flat-hand position, and Lock Part 11 returns to common latched position as shown in Fig. 7 (a).

and, when functional unit 15 is in latched position with flat-hand position as shown in Fig. 7 (a), if exert oneself the toe lateral of functional unit 15 by hand, the bottom that is arrow mark shown in Figure 2 54 positions boosts, as shown in Fig. 7 (c) and Fig. 8 (b), the guiding projecting strip part p of protuberant shape body 14 crosses the top 10o of the lead-in chamfered 11a of section of the downward-sloping shape of Lock Part 11, the recess 10 interior shape that is inclined upwardly (shape that is inclined upwardly that approaches to tooth 9 one sides gradually) the front inner wall face 10a of section to Lock Part 11 move, and with this shape front inner wall face 10a Elastic Contact that is inclined upwardly, and, on the first poor 18a of section of engaging layer of the engaging layer poor section 18 of low protruding part 13 engagings of protuberant shape body 14 in being located at lock box 19, thereby with Lock Part 11 double locking on latched position.

if (a) with reference to Fig. 8, (b) further at this moment state is described, at first, the toe lateral of the functional unit 15 by firmly being in flat-hand position boosts, functional unit 15 becomes forward lean, resist helical spring 16 on one side simultaneously and retreat a little, one side makes the guiding projecting strip part p of protuberant shape body 14 cross the top 10o of the downward-sloping shape lead-in chamfered 11a of section, afterwards, guide projecting strip part p to move to the recess 10 interior shape front inner wall face that the is inclined upwardly 10a of section based on the elastic force pressure of helical spring 16, the high protruding part 12 of protuberant shape body 14 is charged into to the deep inside of recess section 10, and, low protruding part 13 engagings are on the first poor 18a of section of engaging layer of lock box 19.At this moment, the low protruding part 13 of protuberant shape body 14 becomes the state that is clipped by the front inner wall face 10a of recess section 10 and the poor 18a of section of the first engaging layer, because the rotation of Lock Part 11 is prevented from, so even want Retractive leg 4 is pulled out downwards, the locking of the parts 11 that also can't unlock.Namely, the Lock Part 11 that will be positioned at latched position due to the low protruding part 13 by the protuberant shape body 14 of engaging on the first poor 18a of section of engaging layer of lock box 19 further locks, realized thus double locking, so want to pull out and to pull out even Retractive leg 4 is pulled downwards.In addition, when guiding projecting strip part p crosses the top 10o of the downward-sloping shape lead-in chamfered 11a of section and the shape front inner wall face that the tilts 10a in the recess section 10 and moves, the striking sense (sending click) of appropriateness can be produced on functional unit 15, the double locking state of Lock Part 11 can be confirmed thus.

if from making functional unit 15 become forward lean as shown in Fig. 7 (c) and Fig. 8 (b), and the low protruding part 13 by protuberant shape body 14 with Lock Part 11 double locking state, as shown in Fig. 7 (d), hand is placed in handle section 52, and with functional unit 15 with the mode of the elastic force pressure of opposing helical spring 16 to from tooth bar 8 away from direction (with the direction of arrow of figure) pull, functional unit 15 will be back to flat-hand position and protuberant shape body 14 is descended from forward lean, break away from the first poor 18a of section of engaging layer of its low protruding part 13 from lock box 19 simultaneously, and after having removed the double locking of Lock Part 11, the rear inside wall face 10b butt of the high protruding part 12 that is positioned at recess section 10 and recess section 10, and Lock Part 11 is rotated, become the latch-release state identical with Fig. 7 (b) as shown in Fig. 7 (d), thereby functional unit 15 is back to flat-hand position.So, after this latch-release, if the handle section 52 of hand from functional unit 15 decontroled, functional unit 15 movement of advancing under the state that keeps flat-hand position based on the elastic force pressure of helical spring 16, Lock Part 11 is back to the common latched position as shown in Fig. 7 (a) and Fig. 8 (a).

as mentioned above, according to this Retractive leg locking device 7, when functional unit 15 is in flat-hand position and Lock Part 11 and is positioned at latched position, boost by the toe lateral with functional unit 15 and become forward lean, the low protruding part 13 of protuberant shape body 14 is charged into to the recess section 10 of Lock Part 11, and make its engaging in the engaging layer of lock box 19 poor section 18, thereby with Lock Part 11 double locking on latched position, therefore, not can due to carrying during step stool ladder shape supporting leg rock, perhaps from the state that is loaded in the multilayer shape on vehicle etc., step stool is pulled out such action, and Retractive leg 4 accidents are unlocked, thereby can make Retractive leg 4 with respect to support-column main body 2 and positively fix.

in addition, in this Retractive leg locking device 7, the front inner wall face 10a that the recess section 10 of Lock Part 11 has from the nearly side of tooth 9, with the rear inside wall face 10b relative with its almost parallel ground, front and back two internal face 10a, 10b forms the shape that is inclined upwardly on the direction that approaches to tooth 9, the bottom of front inner wall face 10a and the lead-in chamfered 11a of section adjacency, this lead-in chamfered 11a of section is formed near the inlet portion of recess section 10, and be downward-sloping shape on the direction that approaches to tooth 9, when functional unit 15 is flat-hand position, guiding projecting strip part p on the front face side bottom of the outstanding high protruding part 12 that is arranged on protuberant shape body 14 is in the state with the above-mentioned downward-sloping shape lead-in chamfered 11a of section Elastic Contact, so, boost by the toe lateral with functional unit 15, can make guiding projecting strip part p from the downward-sloping shape lead-in chamfered 11a of section, cross the boundary portion 10o of the shape front inner wall face 10a that is inclined upwardly in itself and recess section 10, and move to this front inner wall face 10a, therefore, functional unit 15 is positioned at common latched position at Lock Part 11, it is the monolock timing, can effectively keep parallel posture, and, after making functional unit 15 become forward lean, the guiding projecting strip part p of protuberant shape body 14 on the direction that approaches to tooth 9 with the front inner wall face 10a Elastic Contact of the shape that is inclined upwardly, thus, only otherwise with functional unit 15 rearward, namely to from tooth bar 8 away from direction pull, just can not remove double locking, will be safe.In addition, when guiding projecting strip part p crosses the top 10o of the shape lead-in chamfered 11a of section that has a down dip and the shape front inner wall face that the is inclined upwardly 10a in the recess section 10 and moves, can produce the striking sense (sending click) of appropriateness on functional unit 15, can confirm that thus Lock Part 11 is the double locking state.

In addition, in this Retractive leg locking device 7, due to the handle of functional unit 15 with protruding layer difference section 51 on, be formed with handle section 52 on the end face of a side relative with tooth bar 8, so, if hand is placed in this handle section 52 and pulls, can simply and easily carry out the latch-release operation of functional unit 15.

In addition, according to this Retractive leg locking device 7, because Lock Part 11, functional unit 15 and spring 16 are assembled in lock box 19 in the end that is mounted on pedal 3A, the poor section 18 of engaging layer is formed on the bottom of lock box 19, so, setting with respect to the Retractive leg locking device of pedal 3A is easy, and the installation of pillar 2 and above-mentioned pedal 3A also becomes easy.In addition, in the above-described embodiment, the Retractive leg locking device is arranged on orlop pedal 3A, but is not limited to undermost pedal 3A, also can be arranged on from orlop and count on the pedal 3 of the second layer.

Fig. 9 means the figure that Retractive leg locking device of the present utility model is applied to the embodiment of extension ladder, Fig. 9 (a) means the front view of the part of extension ladder, Fig. 9 (b) is its lateral view, Fig. 9 (c) is the enlarged drawing by part shown in the arrow F of Fig. 9 (a), means the outward appearance front view of the Retractive leg locking device 7 in the utility model.this extension ladder is with lower layer side ladder shape supporting leg 5A and upper layer side ladder shape supporting leg 5B, freely link slidably up and down via operation rope and pulley (omitting diagram), the pair of right and left hollow form pillar 2 that this lower layer side ladder shape supporting leg 5A is being parallel to each other, between 2, multilayer ground crossbearer has hollow form pedal 3, and in the intercalation slidably of the bottom of each pillar 2, Retractive leg 4 is arranged, the pair of right and left hollow form pillar 2 that this upper layer side ladder shape supporting leg 5B is being parallel to each other equally, between 2, multilayer ground crossbearer has hollow form pedal 3, pillar 2 bottoms at lower layer side ladder shape supporting leg 5A, between the end and Retractive leg 4 of its orlop pedal 3A, be provided with for each Retractive leg 4 being fixed as the Retractive leg locking device 7 of regulation leg length.Pillar 2 medial surfaces of lower layer side ladder shape supporting leg 5A and relative angle such as Fig. 9 (c) of pedal 3A upper side are depicted as 90 °.

The Retractive leg locking device 7 of the extension ladder that this is shown in Figure 9 is identical with the Retractive leg locking device of the aforesaid step stool that is also used as ladder, the explanation of omission to its structure and effect, but as shown in Figure 10 (a), (b), this extension ladder boosts and during with Lock Part 11 double locking, low protruding part 13 engagings of protuberant shape body 14 are on the second poor 18b of section of engaging layer of the poor section 18 of engaging layer in the toe lateral with functional unit 15.

Namely, in with the step stool of Retractive leg 4 and the ladder with Retractive leg 4, pillar 2 is different from the angle of pedal 3, in the situation that the step stool with Retractive leg 4 shown in Figure 2, the relative angle of pillar 2 medial surfaces and pedal 3 upper sides is for example 85 °, on the other hand, in the situation that the ladder with Retractive leg 4 shown in Figure 9, due to the pillar 2, the 2nd of pair of right and left, parallel, so the relative angle of pillar 2 medial surfaces and pedal 3A upper side is 90 °.Therefore, generally, as the device in the utility model, by Lock Part 11, functional unit 15 and spring 16 being assembled in lock box 19 inside, and in the situation of the Retractive leg locking device 7 that engaging layer poor section 18 is formed on the bottom of lock box 19 and consists of, because needs are set applicable respectively latched position, so need two kinds of different Retractive leg locking devices of desired location of the poor section 18 of engaging layer.

so, in Retractive leg locking device 7 of the present utility model, as Fig. 2, Fig. 5 and shown in Figure 8, make the poor section 18 of engaging layer of the bottom of being located at lock box 19, by at the first poor 18a of section of engaging layer that forms apart from the specific length part from tooth bar 8 to horizontal direction, with the next side direction of the poor 18a of section of this first engaging layer from tooth bar away from direction form stair-stepping the second poor 18b of section of engaging layer and consist of, in the situation that pillar 2 is different from the angle of pedal 3, with the poor 18a of section of these first and second engaging layers, the 18b difference is used in in the step stool of Retractive leg 4 and the ladder with Retractive leg 4, namely, the first poor 18a of section of engaging layer is used in step stool with Retractive leg 4, the second poor 18b of section of engaging layer is used in the ladder with Retractive leg 4 shown in Figure 9.

if with the relative angle of pillar 2 medial surfaces and pedal 3 upper sides be the situation with the step stool of Retractive leg 4 of 85 °, be that the situation with the ladder of Retractive leg 4 of 90 ° is compared with its relative angle, in the situation that ladder, pillar 2 is with respect to the horizontal plane vertical as illustrated in fig. 9, situation lower supporting rod 2 at step stool tilts to the inside, tooth bar 8 also tilts to the inside thereupon, thus, by comparison diagram 8 (b) and Figure 10 (b) as can be known, front and back internal face 10a with the recess section 10 of the Lock Part 11 of tooth bar 8 engagement, the gradient of 10b is in the situation (Figure 10 (b)) of ladder, compare with the situation (Fig. 8 (b)) of step stool 2 and become large.Like this, with Lock Part 11 double locking the time, the high protruding part 12 of protuberant shape body 14 protrudes into the charge into height of recess section 10 when interior and compares step-down with the situation (Fig. 8 (b)) of step stool 2 the situation (Figure 10 (b)) of ladder is lower.Therefore, in the situation that ladder, becoming for the engaging layer poor section 18 of low protruding part 13 engagings of protuberant shape body 14 can't be by in the situation that the first poor 18a of section of engaging layer of step stool 2 comes engaging, thus, the next at the poor 18a of section of this first engaging layer, to from tooth bar 8 away from direction stepped position form the second poor 18b of section of engaging layer, in the situation that ladder, make low protruding part 13 engagings of protuberant shape body 14 on the poor 18b of section of this second engaging layer, thereby with Lock Part 11 double locking.

By in this wise by in the situation that the first poor 18a of section of engaging layer that step stool 2 uses and in the situation that the second poor 18b of section of engaging layer that ladder uses consists of engaging layer poor section 18, thereby get final product with a kind of necessary part, can seek cheapization of cost.In addition, in this embodiment, be to consist of engaging layer poor section 18 by the first and second two the poor 18a of section of engaging layer, 18b, but also can be in before engaging layer poor section the next, to from tooth bar 8 away from the engaging layer poor section of the stepped formation of direction more than three.

Claims

1. the Retractive leg locking device of a ladder shape supporting leg, it is multilayer between two pillars ground crossbearer to be had pedal and the described Retractive leg of ladder shape supporting leg that Retractive leg intercalation is sliding freely formed in the bottom of each pillar, with the fixing Retractive leg locking device of regulation leg length, it is characterized in that

By consisting of as lower component: be arranged on the tooth bar on Retractive leg; Lock Part is pivotally mounted in the end of lower layer side pedal, has the tooth with tooth bar engagement, and has recess section in the back of tooth side; Functional unit, be supported in the mobile mode of can advancing and retreat along the tread length direction at described pedal side, and can lifting on progressive position, described functional unit has the protuberant shape body that is made of the prominent shape sheet of height and low prominent shape sheet at leading section, the prominent shape sheet of described height is charged into to described recess section from the below, and described low prominent shape sheet is compared with the prominent shape sheet of described height and is positioned on lower position; Spring is so that the mode that Lock Part maintains on latched position is suppressed the functional unit forward direction; With the poor section of engaging layer, so that the mode of the low prominent shape sheet engaging of the protuberant shape body of the functional unit of toe lateral lifting is arranged on described pedal side, described Retractive leg locking device is by retreating functional unit, and make Lock Part rotate to unlock via the prominent shape sheet of height, when Lock Part is positioned at latched position, boost by the toe lateral with functional unit, and the low prominent shape sheet engaging that makes protuberant shape body is in described engaging layer poor section, thereby with the Lock Part double locking.

2. the Retractive leg locking device of ladder shape supporting leg according to claim 1, it is characterized in that, the recess section of described Lock Part has from the front inner wall face of the nearly side of tooth, with the rear inside wall face relative with this front inner wall face, front and back two internal faces form the shape that is inclined upwardly on the direction near to toe joint, near the bottom of front inner wall face and the inlet portion that is formed on recess section, it is the lead-in chamfered section adjacency of downward-sloping shape on the direction near to toe joint, and when being flat-hand position, functional unit is under the state of guiding projecting strip part on the front face side bottom that makes the outstanding prominent shape sheet of height that is arranged on protuberant shape body and described downward-sloping shape lead-in chamfered section Elastic Contact, boost by the toe lateral with functional unit, and make the guiding projecting strip part from downward-sloping shape lead-in chamfered section cross with recess section in the boundary portion of the shape front inner wall face that is inclined upwardly, and move to the front inner wall face of described recess section.

3. the Retractive leg locking device of ladder shape supporting leg according to claim 1 and 2, it is characterized in that, in described Lock Part, functional unit and the spring assembling lock box in being mounted on the end of described pedal, described engaging layer poor section is arranged on the bottom of this lock box.

4. the Retractive leg locking device of ladder shape supporting leg according to claim 3, it is characterized in that, be arranged on the engaging layer poor section of bottom of described lock box by locational the first engaging layer poor section that is formed on from described tooth bar to horizontal direction apart from specific length, with the next side of the first engaging layer poor section from described tooth bar to away from direction form this two poor sections of engaging layer and consisting of at least of stair-stepping the second engaging layer poor section, in the medial surface of the pillar at least two kind ladder shape supporting legs different from the relative angle of the upper side of pedal, use the first engaging layer poor section the little side of angle, use the second engaging layer poor section the large side of angle.