CN207194800U - The practical safe three-leg ladder in orchard - Google Patents

Abstract

The practical safe three-leg ladder in orchard, the three-leg ladder include pedal ladder leg, supporting ladder leg, trample tread and foot of ladder pad；The upper end of pedal ladder leg and supporting ladder leg links together in which can adjust with trampling tread angle, the lower end of pedal ladder leg and supporting ladder leg all padded by foot of ladder with orthogonal shaft coupling, foot of ladder turn now to, upper and lower translation connection；Two pedal ladder legs and a supporting ladder leg are collectively forming the triangular support configurations relation to trampling tread.The utility model is simple for structure, reliable, reasonable, multiple functional, not only remain the original effect of simple three-leg ladder, characteristic, and increased newly trample tread maintain an equal level adjustment, supporting ladder leg rotates constraint, foot of ladder pad gross area contacts to earth and informed with the warning that may topple, so as to by fundamentally having taken precautions against the personal injury event generation because of the initiation that slides, topples, different crowd safe handling limitation is significantly improved, is additionally greatly expanded various geographical environment adaptability.

Description

The practical safe three-leg ladder in orchard

Technical field

A kind of practical safe three-leg ladder in orchard is the utility model is related to, it both can be applied to orchard, can also apply to room Interior or other common environmentals are ascended a height, climbed.

Background technology

At present, be widely used in all kinds of orchard environment ascend a height, the simple three-leg ladder hidden danger climbed it is numerous, especially prominent is Personal safety for user, which lacks, to be effectively ensured.Different age group, sex and the people of social experience are in the normal both hands in orchard Operation simultaneously, and needed according to actual conditions to change self-position, posture frequently, once occur that center of gravity is unbalance to cause ladder to topple Easily there is actual bodily harm.Operator often stands on ladder top, periphery difficulty is looked for by visitors such as the soft skiddings of object and soil Reality is seen, ladder event of toppling more is facilitated and frequently changes, branch is dense, random growth easily causes ladder and toppled process again It can not effectively hide and aggravate extent of injury.If using simple three-leg ladder instead other occasions, with the mutual not phase of terraced leg folding angle Together, first tread is trampled with pedal ladder leg because being fixed angle welding in top, cannot then maintain an equal level according to needing to be adjusted, and two Then terraced leg low side is only welded with angle bar so that is generally contacted to earth with point and is more easy to sliding occur, topples.Lifting platform, double ladder and pull ladder Deng because of many restrictions such as cost, space requirement, trivial operations, it is difficult to be widely used in orchard.

The content of the invention

Purpose of utility model：A kind of practical safe three-leg ladder in orchard is the utility model is related to, it is simple its object is to solve Three-legged ladder can not adjust, maintain an equal level and trample the problem of tread, and it will both trample tread using spine ring, spine cup, slide plate, spring and bolt It is closely coupled to together with pedal ladder leg, enough desirably adjustment maintains an equal level to meet user's demand and can every now and then；In order to subtract Less, prevent sliding, topple, ground is on the one hand contacted by orthogonal shaft coupling foot of ladder pad moment gross area, another side Further strengthen skidproof effect among pricking mellow soil deeply by the nail on anti-skidding sole in face.Except this, with dynamometry potentiometer Constantly detection foot of ladder pad provides ladder in good time with respect to foot of ladder distance change, by one-chip computer foundation distribution of force may topple police Show.The personal safety of orchard application is not only effectively ensured since then, while can also relievedly apply to other all kinds of fields Institute.

Technical scheme：The utility model is achieved through the following technical solutions：

The practical safe three-leg ladder in orchard, it is characterised in that：The three-legged ladder includes pedal ladder leg, supporting ladder leg, tramples ladder Face and foot of ladder pad；The upper end of pedal ladder leg and supporting ladder leg with linking together with trampling tread adjustable angle, pedal ladder leg All padded with the lower end of supporting ladder leg by foot of ladder with orthogonal shaft coupling, foot of ladder turn now to, upper and lower translation connects；Two pedal ladders Leg and a supporting ladder leg are collectively forming the triangular support configurations relation to trampling tread.

Bolt fixing axle is provided with pedal ladder leg top, spine ring is welded with bolt fixing axle coaxial line, tramples tread and wear More spine ring is realized with the connection and rotation between pedal ladder leg；Spine cup is withheld on spine ring end face, spine ring is with spine cup by end face Ratchet reaches engagement, positioning；Spine cup bottom outside is connected with slide plate, and the another side pressure of slide plate has holddown spring, and slide plate another end passes through two The individual bearing pin parallel to bolt fixing axle axis is spacing and is connected to and tramples on tread, and bolt fixing axle passes through Ji Bei bottom centre Circular hole, slide plate and holddown spring, are locked using nut, so as to accomplish the rotation between spine ring and spine cup and lock-bit.

The cross bolts rotating shaft passed through and trample tread is all provided with left and right sides of the supporting ladder leg top, its outside is with nut Realize that lock-bit compresses.

The pedal ladder leg is all configured with foot of ladder with supporting ladder leg bottom, and foot of ladder is cut with scissors using orthogonal shaft coupling with foot of ladder pad Chain, foot of ladder contact ground with being always ensured that foot of ladder pad gross area with foot of ladder pad on-link mode (OLM).

Foot of ladder 11 is provided with the vertical horizontal strip hole of eccentric axis, i.e., horizontal circular hole upper and lower on terraced leg center side line To continuation, bearing pin passes through foot of ladder strip hole and orthogonal shaft coupling（12）, realize foot of ladder and orthogonal connecting shaft internode rotation, up and down Translation is be hinged；Foot of ladder strip hole bias axial plane is orthogonal to be provided with connectivity circular hole upwards, and inspection position bar is inserted with the circular hole, examines position bar Upper end is fixed with spacer, and spacer is promoted on tight against bearing pin by holddown spring, is driven when spacer acts and is fixed on support Slidingtype dynamometry potentiometer above determines the carrying change of foot of ladder pad, dynamometry potentiometer connection one-chip computer indirectly.

Dynamometry potentiometer at any time becomes foot of ladder pad stress check calculation into resistance parameter, one-chip computer according to each leg distribution of force Change, informed when surmounting predetermined threshold value warning of then being toppled in time.

Orthogonal shaft coupling lower end is rotatably connected on foot of ladder pad by rotating shaft, realizes that rotation is be hinged according to this.

The rebasing end of foot of ladder is provided with anti-skidding sole.

Anti-skidding sole bottom is provided with anti-skidding nail.

Advantage and effect：The utility model provides a kind of orchard practical safe three-leg ladder, and the three-leg ladder mainly includes stepping on Plate ladder leg, supporting ladder leg, trample tread, foot of ladder, orthogonal shaft coupling, foot of ladder pad and optional anti-skidding sole；The tread of trampling leads to Cross cross bolts rotating shaft to connect with supporting ladder leg, while utilize bearing pin, slide plate, spine cup, spine ring, holddown spring and bolt fixing axle Connected with pedal ladder leg；The terraced leg pad is connected with pedal ladder leg, supporting ladder leg bottom respectively by orthogonal shaft coupling, foot of ladder, Under the help of orthogonal shaft coupling, terraced leg pad remains that achieving full-area contact is realized on same ground, optional anti-skidding sole further weakens, Avoid orchard soft terrain and use the sliding being likely to occur, event of toppling；The foot of ladder is same by bearing pin using strip hole Orthogonal shaft coupling circular hole hinge, the orthogonal interpolation of the insertion circular hole upwards inspection position bar of foot of ladder strip hole bias axial plane, in holddown spring Under promotion, the linkage slidingtype dynamometry potentiometer moment reflects the gravity that foot of ladder pad carried with resistance Parameters variation indirectly, finally By one-chip computer according to each leg distribution of force, the warning that may topple is provided in good time by default or training threshold value.

The utility model under the premise for inheriting simple three-leg ladder many advantages, by introduce trample tread through slide plate, Spine cup, spine ring, bolt fixing axle overcome with the connection of pedal ladder leg and trample tread and can not be adjusted with terraced leg folding angle difference The drawbacks of whole, fair；Meanwhile original folding, rotation were both remained by means of the cross bolts rotating shaft trampled between tread and supporting ladder leg Characteristic freely, again limit and rotate random degree, and then improve guarantee safe to use；Orthogonal shaft coupling, foot of ladder pad, non-slip feet The collective effect of plate, slidingtype dynamometry potentiometer and one-chip computer etc., increased newly simple three-leg ladder never have it is anti-skidding, anti- Topple and topple warning effect, can not only safely be used in variety classes environment, can also be widely applicable for each age Stage, physical efficiency, agility crowd, even suffer from certain slight handicapped person and open with possible.

The utility model is simple for structure, reliable, reasonable, multiple functional, not only remains the original effect of simple three-leg ladder, spy Property, and increased newly trample tread maintain an equal level adjustment, supporting ladder leg rotates constraint, foot of ladder pad gross area contacts to earth and may toppled warning Inform, so as to by fundamentally having taken precautions against the personal injury event generation because of the initiation that slides, topples, significantly improve different people Group's safe handling limitation, is additionally greatly expanded various geographical environment adaptability.

Brief description of the drawings：

Fig. 1 is agent structure of the present utility model, schematic layout pattern；

Fig. 2 is Fig. 1 side view；

Fig. 3 is tread of the present utility model of trampling with supporting ladder leg, pedal ladder leg attachment structure schematic diagram；

Fig. 4 is Fig. 3 side view；

Fig. 5 connects for the same foot of ladder of each terraced leg of the present utility model, orthogonal shaft coupling, foot of ladder pad, anti-skidding sole, dynamometry potentiometer Connect structural representation；

Fig. 6 is Fig. 5 side view.

Embodiment：The utility model is described further below in conjunction with the accompanying drawings：

The practical safe three-leg ladder in orchard, the three-legged ladder include pedal ladder leg 1, supporting ladder leg 2, trample tread 3 and foot of ladder Pad 16；The upper end of pedal ladder leg 1 and supporting ladder leg 2 links together in which can adjust with trampling the angle of tread 3, the He of pedal ladder leg 1 All realize that steering, upper and lower translation connect with orthogonal shaft coupling 12, foot of ladder pad 16 by foot of ladder 11 in the lower end of supporting ladder leg 2；Two Pedal ladder leg 1 and a supporting ladder leg 2 are collectively forming the triangular support configurations relation to trampling tread 3.

Bolt fixing axle 8 is provided with the top of pedal ladder leg 1, spine ring 5 is welded with the coaxial line of bolt fixing axle 8, tramples ladder Face 3 passes through spine ring 5 and realizes connection and rotation between same pedal ladder leg 1；Spine cup 6, spine ring 5 and spine have been withheld on the end face of spine ring 5 Cup 6 reaches engagement, positioning by end face ratchet；The bottom outside of spine cup 6 is connected with slide plate 9, and 9 another side pressure of slide plate has holddown spring 7, The another end of slide plate 9 is spacing by two bearing pins 10 parallel to the axis of bolt fixing axle 8 and is connected to and tramples on tread 3, and bolt is solid Dead axle 8 passes through the bottom centre's circular holes of Ji Bei 6, slide plate 9 and holddown spring 7, is locked using nut, so as to accomplish spine ring 5 with Rotation and lock-bit between spine cup 6.

The cross bolts rotating shaft 4 passed through and trample tread 3 is all provided with left and right sides of the top of supporting ladder leg 2, its outside with Nut realizes that lock-bit compresses.

The pedal ladder leg 1 is all configured with foot of ladder 11 with the bottom of supporting ladder leg 2, and foot of ladder 11 is using orthogonal shaft coupling 12 with ladder The hinge of foot pad 16, foot of ladder 11 pad 16 on-link mode (OLM)s with foot of ladder and are always ensured that foot of ladder contacts ground with padding 16 gross areas.

Foot of ladder 11 is provided with vertical strip hole, i.e., the continuation of horizontal circular hole above-below direction, bearing pin 13 on center side line The strip hole of foot of ladder 11 and orthogonal shaft coupling 12 are passed through, realizes that the rotation between foot of ladder 11 and orthogonal shaft coupling 12, upper and lower translation are hinged； The strip hole of foot of ladder 11 is orthogonal to be provided with connectivity circular hole upwards, inspection position bar 19 is inserted with the circular hole, it is fixed that inspection position bar 19 upper end is fixed with Bit slice 20, spacer 20 are promoted tight against on bearing pin 13 by holddown spring 21, are driven when spacer 20 acts and are fixed on support 22 Slidingtype dynamometry potentiometer 23 above determines the carrying change of foot of ladder pad 16 indirectly, and dynamometry potentiometer 23 connects one-chip computer 24。

The orthogonal lower end of shaft coupling 12 is rotatably connected on foot of ladder pad 16 by rotating shaft 14, realizes that rotation is be hinged according to this.

Foot of ladder pads 16 bottoms and is provided with anti-skidding sole 17.

The anti-skidding bottom of sole 17 is provided with available anti-skidding nail 18.

As shown in figure 1, the utility model provides a kind of orchard practical safe three-leg ladder, the three-leg ladder mainly includes pedal Terraced leg 1, supporting ladder leg 2, trample tread 3 and the early warning one-chip computer 24 that topples；Pedal ladder leg 1 is for the upper and lower climbing institute of user With it arranges and provided crossbeam that people trample through weldering at a certain distance by left and right terraced leg with some（Riveting）Connect and form, no matter ladder Leg still tramples crossbeam, can both use angular, flute profile, square or rectangle, also can be in irony, aluminum, magnalium, aluminium titanium and not Picked out at random between rust steel, actual product is at that time according to intensity, quality, cost, durability, anticorrosive, and its market purchasing side Just all class factors such as property, determined after Comprehensive, balance；Supporting ladder leg 2 belongs to single leg type column, and its function only exists In supporting ladder not fallen without standing when relying on, its cross sectional shape species and choice of material are analogous to pedal ladder leg 1；Trample tread 3 body shapes are a rectangle frames, and frame can both be welded, and can also rivet, be bolted together, for increase intensity Welded in centre（Riveting）Crossbeam is connected to, to prevent user from accidentally squeezing pin in crossbeam between frame, can be welded above（Riveting）Connect Tabular or netted covering, trample the cross sectional form species and choice of material of the frame of tread 3 and crossbeam, and its top cover material Matter is chosen and is analogous to pedal ladder leg 1；Trample tread 3 with pedal ladder leg 1, supporting ladder leg 2 in a manner of bolt axis to be connected, first borrow Supporting ladder leg 2 realizes that folding changes relative to the rotation of tread 3 is trampled, and is separately then reached using pedal ladder leg 1 relative to the rotation of tread 3 is trampled Trample the fair adjustment of tread 3；One-chip computer 24 then constantly detects pedal ladder leg 1, the bottom dynamometry potentiometer parameter of supporting ladder leg 2 Change, provides the warning that may topple and informs in good time.The alert thresholds that topple are accumulated by default, practical application experience, each leg stress Layout, stress change rapidity, development trend etc., on the basis of the unbalance recovery agility memorized reference of nearest user's center of gravity, Produced by prediction.

Tread 3 is trampled with the attachment structure signal between supporting ladder leg 2, pedal ladder leg 1 as shown in Fig. 2 giving.It is first First, welded on the top orthogonal vertical direction of supporting ladder leg 2（Riveting）Connect angular, the flute profile or square for slightly shorter than trampling the width of tread 3 Crossbeam, crossbeam left and right sides corner are welded with for passing through the cross bolts rotating shaft 4 trampled tread 3 and play connection function, Realize that lock-bit compresses in the outside of cross bolts rotating shaft 4 with nut.Here, crossbeam why do not follow it is common now inside and outside Pipe wears thinking, and its basic goal is exactly while relatively rotating characteristic between reservation supporting ladder leg 2 tramples together tread 3, to press Tight beam regulation is set according to user intention offer is necessary, so as to overcome original safe handling hidden danger that arbitrarily rotational band is come.Go out In easy to process with avoiding electro-chemical reaction, crossbeam material should be consistent with supporting ladder leg 2.Secondly, stepped on to ensure that pedal ladder leg 1 is same The outside of step face 3 intermarginal great disparity, the column top of pedal ladder leg 1 in the left and right sides not too much are all welded with angular transition body, angle One side of shape transition body is welded on the cross section of pedal ladder leg 1, and opposite side is vacantly used to consolidate by the bolt of circular hole thereon Dead axle 8 realizes connection with tread 3 is trampled.Angular transition body is vacantly facing to welding in the circular hole concentric shafts for trampling the side of tread 3 There is a spine ring 5, spine ring 5 realizes that tread 3 is trampled in support through trampling the frame vertical plane circular hole of tread 3, and reaches and allow pedal ladder leg 1 can To be rotated around bolt fixing axle 8 relative to tread 3 is trampled, so as to meet to trample the fair adjustment of tread 3.For the purpose of ensuring that pedal ladder leg 1 and trample corner between tread 3 and lock, the spine cup 6 that bottom of a cup center hole passes through bolt fixing axle 8, spine cup are withheld on spine ring 5 Holddown spring 7 is set with the bolt fixing axle 8 of 6 another sides, end is with nut gear, locking, and nut is pressed to adjust according to this The elasticity tension of tight spring 7.To be welded up to the target of spine cup 6, its bottom face outside（Riveting）Slide plate 9 is connect, the another end of slide plate 9 is by dividing Bearing pin 10 in two circular hole is not passed through close to be connected and maintain each other that pose, angle are constant with trampling tread 3 and realize.To be pre- Antiskid plate 9, which departs from bearing pin 10, to be there is ladder and falls, and bearing pin 10, which should be selected, has perforate species, and is given with split pin spacing. Regulation trample tread 3 maintain an equal level angle when spine cup 6 is together risen together with slide plate 9 along bearing pin 10 axial plate, depart from spine ring 5, spine cup 6 Engagement, spine cup 6 and slide plate 9 are unclamped after the completion of regulation, recover original spine ring 5, spine again under the promotion of holddown spring 7 Locking is engaged between cup 6.The ratchet that spine ring 5 belongs to ratchet in fact is changing to the simple mutation of ring cross-section, spine cup 6 from circumference bus Spine ring 5 is also similar to, difference is only the former for the offer of holddown spring 7 acts supporting surface and is set in ratchet opposition end bottom There is the bottom of a cup of center hole.Spine ring 5, the tooth form of spine cup 6 both can be triangles, also can be trapezoidal or rectangle, and it is selected It is reconciling, trading off between tooth pitch, tooth height, locking security and the conversion degree of convenience etc. that maintains an equal level to take crucial foundation.Tooth pitch herein It is overriding concern emphasis, because it directly decides the exquisiteness and resolution ratio for trampling the fair adjustment of tread 3, but due to restricted In the restriction of other several factors, can not excessively preference and be led to and hinder overall performance to improve.In fact, spine ring 5, spine cup 6, cunning Fair regulation that plate 9 and holddown spring 7 etc. collectively constitute, locking mechanism are not the unique channel for reaching this target, if being ready Still substituted using traditional ratchet, ratchet.

As shown in Figures 1 and 3, the left and right ladder leg bottom of supporting ladder leg 2 and pedal ladder leg 1 is all welded（Riveting）Foot of ladder 11 is connected to, Foot of ladder 11 is provided with the vertical horizontal strip hole of eccentric axis on center side line, i.e., the continuation of horizontal circular hole above-below direction, from It is a vertical strip hole that side, which is seen, and the strip hole runs through foot of ladder 11, so that the bearing pin 13 passed through therebetween is made in carrying pressure Upper and lower translation motion is made under, bearing pin 13, which selects opening type and prevents it with split pin insertion, bending, to come off.Pass through foot of ladder 11 The bearing pin 13 of strip hole realizes rotary gemel with the orthogonal top circular hole of shaft coupling 12, and orthogonal shaft coupling 12 is relative to nose-circle hole axle Line is orthogonal and the rotating shaft 14 on the lower side being welded in together, under the help of rotating shaft buckle closure 15 that orthogonal shaft coupling 12 and foot of ladder pad 16 is tight Thickly link together.The side that lands of foot of ladder pad 16 can connect anti-skidding sole 17, anti-skidding sole temporarily optionally through bolt Anti-skidding nail 18 on 17 ensure that orchard soft terrain use is not in that sliding is toppled.Anti-skidding nail on anti-skidding sole 17 18 numbers can be changed, but consider with length according to geology species and user intention in quite broad scope Stress equalization and visual appearance, recommend to the utmost in pairs, be arranged symmetrically.Its transversal dimensions, choice of material also have great deal empty Between, such as, it can just be chosen in terms of material between cast iron, mild steel, high-carbon steel, or even manganese steel etc..Certainly, appropriately Material positioning must still take durable, hardness, embrittlement, cost and buying convenience, etc. into account, can not attend to one thing and lose sight of another.Orthogonal shaft coupling 12 and rotating shaft 14 thereon undertaken foot of ladder jointly and pad 16 front, rear, left and right and adapted to the uneven mission in ground, finally ensure foot of ladder Pad 16 maintains to contact gross area, takes this to further improve anti-skidding topple all the time within the sufficiently large slant range in ground Tumble is collapsed with rat hole.In addition, take on the rotating shaft buckle closure that rotating shaft 14 on orthogonal shaft coupling 12 compresses lock-bit responsibility with foot of ladder pad 16 15, not only bear connection function, and both sides or so distribution and close twist-on yet forms both without specially adjust it is non-wantonly, from Adapt to ground slope characteristic.

As it was previously stated, the bearing pin 13 passed through in the strip hole of foot of ladder 11 is not only connected to foot of ladder 11 and orthogonal shaft coupling 12, make Obtain orthogonal shaft coupling 12 may be rotated, while it also provides action for inspection position bar 19, and its connected dynamometry current potential 23 Rely on.Bearing pin 13 is tightly fixed to above orthogonal shaft coupling 12, and both is almost motionless, and bearing pin 13 passes through The structure of 11 vertical strip hole of foot of ladder cause with foot of ladder pad 16 stress change, drive orthogonal shaft coupling 12 together with bearing pin 13 relative to Foot of ladder 11 does upper and lower translation motion, because bearing pin 13 is circular, so also make it that orthogonal shaft coupling 12 is relative around the axis of bearing pin 13 Rotated in foot of ladder 11.Inspection position bar 19 is fixed with spacer 20 in the outside of foot of ladder 11, and spacer 20 is promoted simultaneously tight by holddown spring 21 Offset on axle 13,21 another side of holddown spring relies on fixed support 22 and turns to bottom plate and form assembling stop and coordinate.Spacer 20 drive the slidingtype dynamometry potentiometer 23 being fixed on above support 22, and foot of ladder pad 16 is carried into bearing pin 13 caused by stress change It is mobile, change into resistance parameter variations indirectly, and then by 24 each terraced leg load-bearing and distribution being collected into of one-chip computer, Development trend, with reference to various preceding factors, consider after Comprehensive, give necessary warning quarter in due course and inform.Dynamometry Potentiometer 23 connects with spacer 20, can either use snap fit, socket joint type can also be used, comparatively, if current potential The travelling arm of device is thick enough, and plug-in is in assembling and the slightly aobvious advantage of gap adaptation etc..

Claims (8)

1. the practical safe three-leg ladder in orchard, it is characterised in that：The three-leg ladder includes pedal ladder leg（1）, supporting ladder leg（2）, step on Step face（3）With foot of ladder pad（16）；Pedal ladder leg（1）With supporting ladder leg（2）Upper end with trampling tread（3）Angle can adjust ground Link together, pedal ladder leg（1）With supporting ladder leg（2）Lower end all pass through foot of ladder（11）With orthogonal shaft coupling（12）, foot of ladder Pad（16）Realize steering, upper and lower translation connection；Two pedal ladder legs（1）With a supporting ladder leg（2）It is collectively forming to trampling ladder Face（3）Triangular support configurations relation.

2. the practical safe three-leg ladder in orchard according to claim 1, it is characterised in that：In pedal ladder leg（1）Top is set There is bolt fixing axle（8）, bolt fixing axle（8）Spine ring is welded with coaxial line（5）, trample tread（3）Pass through spine ring（5）Realize same Pedal ladder leg（1）Between connection and rotation；In spine ring（5）Spine cup has been withheld on end face（6）, spine ring（5）With spine cup（6）By end Face ratchet reaches engagement and positioning；Spine cup（6）Bottom outside is connected with slide plate（9）, slide plate（9）Another side pressure has the first holddown spring （7）, slide plate（9）Another end is by two parallel to bolt fixing axle（8）First bearing pin of axis（10）It is spacing and be connected to and trample Tread（3）On, bolt fixing axle（8）Pass through spine cup（6）Bottom centre's circular hole, slide plate（9）With the first holddown spring（7）, use Nut is locked, so as to accomplish spine ring（5）With spine cup（6）Between rotation and lock-bit.

3. the practical safe three-leg ladder in orchard according to claim 1, it is characterised in that：The supporting ladder leg（2）Top is left Right both sides, which all are provided with to pass through, tramples tread（3）Cross bolts rotating shaft（4）, its outside realizes that lock-bit compresses with nut.

4. the practical safe three-leg ladder in orchard according to any one in claim 1-3, it is characterised in that：The pedal Terraced leg（1）With supporting ladder leg（2）Bottom is all configured with foot of ladder（11）, foot of ladder（11）Utilize orthogonal shaft coupling（12）With foot of ladder pad （16）Hinge, foot of ladder（11）With foot of ladder pad（16）On-link mode (OLM) is always ensured that foot of ladder pad（16）Contact ground gross area.

5. the practical safe three-leg ladder in orchard according to claim 4, it is characterised in that：Foot of ladder（11）On center side line It is provided with vertical strip hole, the second bearing pin（13）Pass through foot of ladder（11）Strip hole and orthogonal shaft coupling（12）, realize foot of ladder（11） With orthogonal shaft coupling（12）Between rotation and upper and lower translation be hinged；Foot of ladder（11）Strip hole is orthogonal to be provided with connectivity circular hole upwards, Inspection position bar is inserted with the circular hole（19）, examine position bar（19）Upper end is fixed with spacer（20）, spacer（20）Bullet is compressed by second Spring（21）Promote tight against the second bearing pin（13）On, spacer（20）Driven during action and be fixed on support（22）Slidingtype above Dynamometry potentiometer（23）Foot of ladder pad is determined indirectly（16）Carrying change, dynamometry potentiometer（23）Connect one-chip computer（24）.

6. the practical safe three-leg ladder in orchard according to claim 5, it is characterised in that：Orthogonal shaft coupling（12）Lower end passes through Rotating shaft（14）It is rotatably connected at foot of ladder pad（16）On, realize that rotation is be hinged according to this.

7. the practical safe three-leg ladder in orchard according to claim 1, it is characterised in that：Foot of ladder pad（16）Bottom is provided with anti- Shoes plate（17）.

8. the practical safe three-leg ladder in orchard according to claim 7, it is characterised in that：Anti-skidding sole（17）Bottom is provided with Available anti-skidding nail（18）.