CN101892804B

CN101892804B - Ladder

Info

Publication number: CN101892804B
Application number: CN2010102151188A
Authority: CN
Inventors: 李�杰; 符祖经
Original assignee: Tianjin Jinmao Group Co Ltd
Current assignee: Tianjin Jinmao Group Co Ltd
Priority date: 2010-07-01
Filing date: 2010-07-01
Publication date: 2012-08-08
Anticipated expiration: 2030-07-01
Also published as: CN101892804A

Abstract

A ladder relates to a ladder with the locking structure of the modified ladder platform or pedal and the locking structure between ladder frames, wherein the ladder platform is provided with hook locks for locking stairs; each hook lock is integrated by an assembling part and a hooking part; each ladder frame lock comprises a moving lock part, a fixed lock part and a moving lock base part; the moving lock part is provided with a moving lock hook lock part which can hook a fixed lock hook lock part; and the fixed lock part is provided with the fixed lock hook lock part which can hook the moving lock hook lock part. Therefore, the ladder with different ladder platform assembling structures and ladder frame locks can be formed; and the moving lock part can drive the moving lock hook lock part to open up or clamp under the action of a spring, thus hooking the fixed lock hook lock part. By installing reasonably the ladder platform assembling structure of the ladder of the invention, the part structure of the ladder platform assembling structure becomes more firm and substantial, parts become lighter, the reliability and safety of the ladder of the invention are ensured; the ladder becomes lighter; and the structure of the invention is easy, the manufacturing process is optimized, the production cost is effectively reduced and the industrial popularization and application are conveniently performed.

Description

Ladder

Technical field

This case belongs to the ladder field, relates to the ladder of the locked configuration of the locked configuration of improving terraced platform or pedal and terraced frame and terraced frame.

Background technology

For the ladder with foldable platforms, safety locking platform, quick-folding platform make every effort on this basis that structure is simpler, material is more saved, and is the continuous pursuit of industry.

For ladder with main ladder and secondary ladder, when folding major and minor ladder, need safety locking, be convenient to collection, industry is constantly pursued for this reason, but still can not satisfy market demand.

As the architecture advances of 200420019380.5 1 kinds of terraced chairs of disclosed Chinese patent, it is made up of side arm, middle frame, two binding groups and after-frame; Side arm is leading portion two sides of counting pedal for pivot in the middle of ㄇ shape support body and the tow side section admittedly; The support body that middle frame is made up of two montants and four crosspiece solid weldings; In the middle of second and third crosspiece of frame two montants, being was an end and middle frame two montant fits, end is constructed with the slidably binding that the after-frame pivot closes in addition during the binding group was located in, and its binding group is made up of left piece, right piece, connecting rod and snap close piece; The center that an inclined-plane and left piece are established in top, the outer end of its left piece is to dividing into a ㄈ shape groove, and the inner of left piece is provided with horizontal pole perforating hole; In the inner correspondence of its right piece the montant diameter of frame establish a vertical half slot and outside end be provided with horizontal pole perforating hole, and the sidewall of right piece is provided with the caulking groove person who supplies left piece the inner to push; Its connecting rod is a laying rod piece of wearing the pole perforating hole of the pole perforating hole that passes through right piece and left piece; Snap close piece is to be sheathed on colluding of connecting rod stage casing to anchor the position structure; It is solid that the support body that after-frame is made up of across bar two montants and, the top of its after-frame are used the tow side section pivot of screw tightening and side arm, and two montant inwall correspondences of after-frame are provided with two hinged arm grooves, and this two hinged arms groove can supply two ends of connecting rod to embed; By slidably binding group can make terraced chair in support when steadily firm and terraced chair folds during exhibition width fall sharply to be beneficial to and take in, and terraced chair fold the operation simple and convenient.

The assembled configuration of disclosed for another example Chinese patent 200620026166.1 terraced supporting plates; This ladder supporting plate becomes and can be journaled on the ladder around first cross bar rotation attitude; This first cross bar is horizontal between main ladder frame, and wherein, described terraced supporting plate is assembled by the profile plate of the primary and secondary buckling structure with adjacency.The structure setting of this case makes terraced supporting plate and terraced pedal can use the section bar manufacturing of same specification, reaches the purpose that reduces manufacturing cost.

As 01,200,186 1 kinds of Folding ladders of disclosed Chinese patent; Above its fore-stock, be articulated with after-poppet; The fore-stock arranged on both sides has several gangboards, and the front end of gangboard is pivoted through connecting rod connection, also is provided with a cross bar on the after-poppet; Last gangboard front end in several gangboards is provided with one and wears groove, and cross bar convexes with a block laterally; Wear and be equipped with a blocking plate in the groove, the outer end of blocking plate is provided with a sliding piece, and the inboard is formed with the top and supports edge, and the blocking plate extends to form the blocking hook that can chimericly be fastened on the said cross bar to the inner.

02229881.9 1 kinds of snap closes of and for example disclosed Chinese patent are used for the snap close of ladder, and this snap close comprises a main snap close 1; There is clamping body on one side of main snap close 1, cooperates snap close 2 to link to each other through a connecting axle 11 with one at the another side of main snap close 1, and the other end of said cooperation snap close 2 has fixing hole 21; And at main snap close 1 or/and cooperate on the snap close 2 stopping means arranged; Make winner's snap close 2 and cooperate snap close 2 can only be in limited range movable, use two ladders of the ladder of this snap close to link to each other with the two ends of snap close respectively, when the ladder expansion is " one " shape vertical ladder or two ladders fold when being down " V " shape foot of ladder; The clamping body of snap close blocks card post 72; After ladder has made this snap close, need not to take off snap close when folding, bring convenience to use; And make ladder can doublely do " one " shape vertical ladder and to fall " V " shape foot of ladder dual-purpose.

Industry is expected a kind of different structure locked configuration ladder appearance that has, and satisfies the diversified demand of market to product, improves the security performance and the Adapter Property of ladder.

Summary of the invention

Problem to be solved by this invention is to overcome the above-mentioned defective that aforementioned techniques exists; And a kind of platform locking structure and ladder thereof that is used for ladder is provided, so that the ladder structure more simply, more optimizes, so that ladder lightweight more; More save material, safety also needs more secure.

Technical solution problem of the present invention takes following technical scheme to realize; According to a kind of ladder provided by the invention; Comprise main ladder, secondary ladder and be installed in the terraced platform between main ladder and the secondary ladder; Wherein: terraced platform assembling structure is: on the said terraced platform latch hook is installed, this latch hook is used to lock step; Said latch hook is integrally formed by department of assembly and hooked part, and this latch hook has preset thickness, forms department of assembly's crestal surface and hooked part crestal surface, and said department of assembly crestal surface is the contact surface that coincide with terraced platform, and this department of assembly has the skidway hole that holds pin slide; The hooked part crestal surface has spring assembling bolt, is used for mounting spring; Spring one end seat is on spring assembling bolt, and the other end holds by terraced platform lateral wall; Said hooked part has the touching end that can touch step; This department of assembly and hooked part form the hook groove that can hold step; The bottom of said terraced platform has the assembly type groove that latch hook is installed, and said assembly type groove has the pin shaft hole that the appearance bearing pin installs, and the abutment pin axis hole can be provided with the bearing pin positive stop key of restriction latch hook sliding position; Said terraced frame lock is made up of moving lock portion, lock portion and movable lock base part, and moving lock portion has the moving lock latch hook portion that can hook together with the lock hook portion, and lock portion has the lock hook portion that can hook together with moving lock latch hook portion.

Formation has the terraced platform assembling structure of different structure and the ladder of terraced frame lock thus; Moving lock portion can drive moving lock latch hook portion and open or clamp under spring action, realize hooking together with the lock hook portion of task.

This case technical solution problem can also take following technical scheme further to realize:

Aforementioned ladder; Wherein: said terraced platform lateral wall is stretched and is established the spring containing cavity; This spring containing cavity has predetermined depth; This spring holding part is corresponding with the spring assembling bolt of latch hook hooked part crestal surface, and this spring holding part is provided with the spring fixed part, and this spring fixed part is made up of two spring positive stop keys that can block spring; Described moving lock integrally formed moving lock latch hook portion of portion and moving lock force section form the moving lock pivot hole between moving lock latch hook portion and moving lock force section; Spring is by being pivotally mounted between movable lock base part and the moving lock portion; Integrally formed lock buck plate and the lock hook portion that can coincide with the terraced frame of main ladder or secondary ladder of said lock portion; The lock buck plate of said lock portion has lock first fitting surface and lock second fitting surface; Second fitting surface along the lock buck plate stretches out formation lock hook portion.

Aforementioned ladder, wherein: also dispose the attacker on the hooked part crestal surface of said latch hook; Be used to spur latch hook in the effect lower edge of spring skidway hole direction slides in telescopic; The axle center of said moving lock pivot hole and moving lock latch hook portion and moving lock force section are on the same horizon of on the same horizon or the axle center of moving lock pivot hole near moving lock latch hook portion and place, moving lock force section.

Aforementioned ladder, wherein: the step limiting section is set on the terraced platform, is responsible for moving with latch hook engagement limits step; Said lock hook portion has fixed lock hook groove inclined-plane, forms the fixed lock hook groove that satisfies preset angle between first fitting surface of this fixed lock hook groove inclined-plane and lock buck plate; The end face of this fixed lock hook groove inclined-plane and lock hook portion forms the fixed lock hook end of satisfying preset angle; The moving lock latch hook portion of said moving lock portion is made up of moving lock hook portion and moving lock latch hook neck; This moving lock hook portion has moveable lock hook groove inclined-plane; Form the moveable lock hook groove that satisfies preset angle between this hook groove inclined-plane and the moving lock latch hook neck; The moveable lock hook end of said moving lock portion has moveable lock hook groove inclined-plane and moving lock sliding bevel, forms moving lock hook portion end face between moveable lock hook groove inclined-plane and the moving lock sliding bevel, and moving lock hook portion end face and moveable lock hook groove inclined-plane form and satisfy the moving lock latch hook termination of presetting angle.

Aforementioned ladder, wherein: said step limiting section is provided with 2 or 3 or 4; Said lock portion extends upward end face with hook portion along lock second fitting surface of lock buck plate and crosses and form the stupefied limit of lock portion, and the stupefied limit of this lock portion can contact the moving lock sliding bevel of moveable lock hook end.

Aforementioned ladder, wherein: the step limiting section of the assembly type groove in the said terraced platform, bearing pin positive stop key, spring containing cavity, spring fixed part, terraced platform is all one-body molded; Form the hook-type hollow out in the middle of the moving lock hook portion of said moving lock latch hook portion and the moving lock latch hook neck; The stupefied limit of said lock portion is the stupefied limit of circular arc.

Aforementioned ladder, wherein: also have connecting rod to be installed on the terraced platform, be responsible for secondary ladder of drive and main ladder and close up; The fixed end of connecting rod is journaled on the terraced platform, and connecting rod can rotate around terraced platform; The free end of connecting rod is connected with the step of secondary ladder or main ladder; Said movable lock base part has the pedestal buck plate that can coincide with the terraced frame of secondary ladder or main ladder, and this pedestal buck plate has pedestal first fitting surface and pedestal second fitting surface; Be provided with on said pedestal first fitting surface that first pivot assembling is picked up the ears and second assembling is picked up the ears; Between picking up the ears, this first, second pivot assembling forms the spring installation portion of putting spring; Said spring is by the spring spire on the ability suit pivot and first exit and second exit of spring spire, and this first exit is used to replace the moving lock force section, and second exit is embedded in the spring installation portion, receives replacing of pedestal first fitting surface.

Aforementioned ladder; Wherein: said connecting rod one end has first pilot hole that can be sleeved on the step; The other end of connecting rod has second pilot hole that can be installed in terraced platform fixed position, and first pilot hole is greater than second pilot hole, the integrally formed pilot hole flange in the edge of first pilot hole and second pilot hole; And first pilot hole, second pilot hole all have endoporus and meet face, this endoporus meet face can be assembled member formation face and contact; Said spring has two identical spring spires of structure, i.e. the first spring spire and the second spring spire, integrally formed exit changeover portion between first exit of first exit of the first spring spire and the second spring spire.

Aforementioned ladder; Wherein: two circumscribed lines between first pilot hole of said connecting rod and second pilot hole form first, second edge of connecting rod, the outside flange of first, second edge of this connecting rod and first pilot hole and the integrally formed connecting rod of the second pilot hole outer rim; Ladder frame lock is installed on main terraced frame and the secondary terraced frame, and first pivot assembling of said movable lock base part is picked up the ears, second assembling picks up the ears all to have defining flange.

Aforementioned ladder, wherein: said connecting rod one injection molding becomes, and the middle part of this connecting rod has hollow hole; The horizon at moving lock hook portion end face and moving lock latch hook portion, place, moving lock force section is parallel to each other; Has pedestal ear wall portion between first pivot assembling of said pedestal first fitting surface is picked up the ears and the assembling of second pivot is picked up the ears; Said pedestal ear wall portion has the pedestal ear wall portion top of satisfying preset height, and this pedestal ear wall portion top is used for moving lock latch hook portion is formed restriction.

The present invention compared with prior art has significant advantage and beneficial effect.

Can know that by above technical scheme the present invention has following advantage at least under the structure configuration of excellence:

The reasonable setting of terraced platform assembling structure in this case ladder makes more lightweight of the more solid and parts of the modular construction of terraced platform assembled portion, and this case ladder stabilizer property, safety are more secure, and ladder is lighter; The reasonable setting of this case ladder frame lock, this case be decide element, to be element with moving lock portion with movable lock base part, utilize spring driving moving lock latch hook portion to open or clamp, combine the realization of lock portion to hook together, thereby major and minor terraced frame is locked together; This case is reasonable in design can conveniently to realize locking and disengagement; The reasonable disposition of this case lock portion and moving lock portion, make terraced frame lock be solid not only lightweight, promptly lock quick but also safe and reliable; And its simple structure can make manufacturing process more optimize, and effectively lowers cost of production, the industry of being more convenient for promotion and application.

The specific embodiment of the present invention is provided by following examples and accompanying drawing thereof in detail.

Description of drawings

Fig. 1 is the structural representation of this case ladder;

Fig. 1 a is the local assembling decomposition texture sketch map that amplifies of Fig. 1;

Fig. 2 is the local assembling decomposition texture sketch map that amplifies of this case ladder;

Fig. 2 a is the local enlarged diagram of Fig. 2;

Fig. 3 is the cross-section structure sketch map of this case ladder platform assembling structure;

Fig. 4 is this case ladder platform assembling structure assembling decomposition texture sketch map at another visual angle;

Fig. 4 a is the local structural representation that amplifies in the bottom of terraced platform;

Fig. 5 is during this case ladder uses, the plane structure structural representation of collapse state;

Fig. 5 a is during this case ladder uses, the plane structure structural representation of opening procedure;

Fig. 5 b is during this case ladder uses, all the plane structure structural representation of open mode;

Fig. 5 c is during this case ladder uses, and prepares the plane structure structural representation of collapse state.

Fig. 6 is this case ladder open mode, the structural relation sketch map of terraced frame latch hook and ladder;

Fig. 6 a is the local structure for amplifying sketch map that moving lock portion combines with terraced frame;

Fig. 6 b is the local structure for amplifying sketch map that lock portion combines with terraced frame;

Fig. 7 is that perspective view is amplified in the part that this case ladder frame latch hook combines with the major and minor terraced frame of ladder;

Fig. 8 is this case ladder collapse state, the structural relation sketch map of terraced frame latch hook and ladder;

Fig. 8 a is the local enlarged diagram of Fig. 3;

Fig. 9 is the perspective view that the assembling of this case ladder frame lock is decomposed;

Figure 10 is the plane structure sketch map of the moving lock of this case ladder frame latch hook when breaking away from lock;

Plane structure sketch map when Figure 11 is this case ladder frame latch hook locking major-minor ladder.

The specific embodiment

Below in conjunction with preferred embodiment, to according to the specific embodiment provided by the invention, characteristic and effect thereof, specify as after; For simple and purpose clearly, the omission that hereinafter is appropriate the description of known technology, in order to avoid those unnecessary details influences are to the description of present technique scheme.

Shown in Fig. 1-11; A kind of ladder comprises master terraced 1, secondary terraced 2 and is installed in the terraced platform 3 between main ladder and the secondary ladder that terraced frame lock 7 is installed on terraced frame of master and the secondary terraced frame; Ladder frame lock is responsible for main terraced frame of locking and secondary terraced frame when main ladder and secondary ladder close up, and is convenient to collect;

The assembling structure of said terraced platform is: terraced platform one end is installed on main ladder or the secondary ladder through pivot 10; The other end can ride on the corresponding step 20 of secondary ladder or main ladder; The step of support ladder platform and pivot are adorned the pivot 10 corresponding configurations of terraced platform, and at grade; On the ladder platform 3 latch hook 5 is installed, is responsible for making the step of terraced platform and secondary ladder or main ladder to lock; During use, terraced platform is at horizontal level, and terraced platform is by its bottom surface latch hook locking, and when folding, latch hook breaks away from step, and terraced platform relatively rotates around pivot 10, folds on the main ladder or secondary ladder at pivot place;

Common terraced platform is installed in upper level, does not also get rid of the possibility that terraced platform is installed in other step; Fig. 1 has provided the pivot dress end of terraced platform on main ladder, and the situation of step on secondary ladder of support ladder platform do not got rid of opposite situation yet, and the pivot dress end of terraced platform is on secondary ladder, and the step of support ladder platform is on main ladder; Wherein,

Latch hook 5 is installed on the terraced platform 3 through bearing pin 501,502, is used to hook the step of secondary ladder or main ladder, realizes the locking of terraced platform and step;

Said latch hook is by department of assembly 51 and hooked part 52 integrally formed " L " shape structure; This latch hook has preset thickness a, forms department of assembly's crestal surface 510 and hooked part crestal surface 520, and department of assembly's crestal surface is the contact surface that coincide with terraced platform bottom; Thus; Department of assembly's crestal surface can steadily combine with the contact surface of terraced platform, and the hooked part crestal surface has spring assembling bolt 521, is used for mounting spring 6; Also dispose attacker 522 on the hooked part crestal surface, be used to spur the length direction slides in telescopic of latch hook skidway hole 511,512 in the effect lower edge of spring;

Said hooked part has the touching end G that can touch step; It is most advanced and sophisticated, more laborsaving that this touching end G is made as the touching that can form some contact; See Fig. 5 a, the setting of the touching end G of latch hook can be when opening ladder, and the touching end of latch hook receives the collision of step 20; The stressed opposite direction to f of latch hook moves, and spring is compressed, when terraced platform forwards horizontal level to; Spring reset, latch hook also " have been held " step 20 tightly, have realized locking;

This department of assembly and hooked part form the hook groove 54 that can hold step (or cross bar);

Said department of assembly has the skidway hole 511,512 that holds bearing pin 501,502 slips, and skidway hole has assembling and two functions of slideway concurrently thus; Moreover; Because latch hook has preset thickness; The skidway hole of said department of assembly is also corresponding to have a width, and the hook groove that said department of assembly and hooked part form is also corresponding to have a width, and bearing pin also is into face with skidway hole and contacts thus; The hook groove also has the contact surface that can coincide and contact with step, thereby effectively improves the stationarity of parts combination;

The bottom of said terraced platform 3 has the assembly type groove 30 that latch hook is installed, and the department of assembly that this assembly type groove is used to hold latch hook sets wherein; Said assembly type groove has pin shaft hole 301a, the 301b that appearance bearing pin 501,502 installs, and the abutment pin axis hole can be provided with bearing pin positive stop key 302a, the 302b of restriction latch hook sliding position; Spring 6 one end seats are on spring assembling bolt, and the other end holds by terraced platform 3 lateral walls;

Further, said terraced platform 3 lateral walls are stretched and are established spring containing cavity 303, and this spring containing cavity has predetermined depth b; This spring holding part is corresponding with the spring assembling bolt 521 of latch hook hooked part crestal surface; This spring holding part is provided with spring fixed part 3036, and this spring fixed part 3036 is made up of two spring positive stop keys that can block spring, and structure is provided with thus; Can more convenient technology assemble, improve frock efficient;

On the ladder platform step limiting section 304 is set, is responsible for moving with latch hook engagement limits step; Said step limiting section 304 is uniformly distributed with setting according to the length of step, can be provided with 1 or 2 or 3 or 4 or a plurality of;

When terraced platform is positioned at horizontal level; The step of support ladder platform has three dimension faces all in the embracing of latch hook; Be the step first dimension face W1, step two-dimensional surface W2, step third dimension face W3; The step limiting section of ladder platform just can be replaced the fourth dimension face W4 of step, and the step limiting section of terraced platform combines formation to encircle stepped configuration with latch hook thus, effectively raises the steadiness and the safety of terraced platform;

Said terraced platform 3 one-piece type one-tenth; Be provided with all can be one-body molded for the structures such as step limiting section of assembly type groove 30, bearing pin

positive stop key

302a, 302b, spring containing cavity 303, spring fixed part 3036, terraced platform thus; Can effectively reduce manufacturing cost, improve frock efficient, improve safety;

The assembling structure that terraced platform of constructing thus and latch hook constitute terraced platform;

Also have; Connecting rod 4 is responsible for when folding ladder platform 3, driving secondary ladder simultaneously and main ladder closes up, but this connecting rod one injection molding one-tenth, and connecting rod one end has first pilot hole 42 that can be sleeved on the step 20; The other end of connecting rod has second pilot hole 43 that can be installed in terraced platform fixed position; First pilot hole is greater than second pilot hole, the integrally formed pilot hole flange in the edge of first pilot hole and second pilot hole, and first pilot hole, second pilot hole all have endoporus and meet face; On the one hand the connecting rod pilot hole can form and be assembled the contact endoporus of broad of member and meet face 420, the contact of formation face, thereby the stationarity and the safety that can effectively improve the terraced member that cooperatively interacts; Equally, second pilot hole also forms endoporus and meets face; On the other hand, the pilot hole flange also can effectively be strengthened the intensity of connecting rod; The said member that is assembled refers to step 20 or terraced platform fixed point pivot 34 here;

Two circumscribed lines between first pilot hole and second pilot hole form the first edge 41a, the second edge 41b of connecting rod; The outside flange 41 of first, second edge of this connecting rod and first pilot hole and the integrally formed connecting rod of the second pilot hole outer rim; Can effectively strengthen the intensity, particularly plastic item connecting rod of connecting rod thus; The middle part of connecting rod has hollow hole, so far, can be under the situation that satisfies the connecting rod preset strength saving member material more;

Hollow hole 44 is set on the said connecting rod, not only can makes the parts lightweight, also can be used for the usefulness of hanging object conveniently, provide convenience.

Main ladder 1 is installed by connector 9 with secondary ladder 2.

Shown in Fig. 5,5a, 5b, 5c, ladder from collapse state to the open mode process, the closed or tectonic relationship between ladder platform and latch hook and the ladder when opening of ladder, pulling latch hook 5, to apply power be F, can make latch hook disengaging step 20; F is when opening ladder, and in the process of terraced platform trend level, spring is to the active force of latch hook, and latch hook is the locking step under the effect of spring.

Shown in Fig. 6-11; Said terraced frame lock 7 is made up of moving lock portion 72, lock portion 71 and movable lock base part 70; Lock portion 71 is installed on main terraced frame 1 or the secondary terraced frame 2; Moving lock portion 72 is installed on the movable lock base part 70 through pivot 74 (referring to Fig. 9), and moving lock portion 72 is installing through the mode that spring rotates around the pivot formation of movable lock base part; Movable lock base part is installed on secondary terraced frame 2 or the main terraced frame 1, referring to Fig. 6,6a, 6b;

Said moving lock portion 72 has moving lock latch hook portion 722 and moving lock force section 721, between moving lock latch hook portion 722 and moving lock force section 721, is moving lock pivot hole 7234; Spring 75 is by being pivotally mounted between movable lock base part 70 and the moving lock portion 72, form thus with movable lock base part be decide element, with the clip structure of moving lock portion for moving element; Spring is used for moving lock force section 721 is formed directed force F, and driving moving lock latch hook portion 722 opens or clamps, hooks together, and this is an operating principle of having quoted clip, referring to Fig. 9;

The said lock portion 71 integrally formed lock buck plates 710 and lock hook portions 7101 that can coincide with the terraced frame of main ladder or secondary ladder; This lock hook portion 7101 is used for hooking together each other with moving lock latch hook portion 722 coupling; Thus; Lock portion is installed on main ladder or the secondary ladder, referring to Fig. 9 by fixture through the lock buck plate;

Further; Be positioned between moving lock latch hook portion 722 and the moving lock force section 721 the moving lock pivot hole above form moving lock protrusion 723; So that the axle center of moving lock pivot hole 7234 and moving lock latch hook portion and moving lock force section are basically on same horizontal line L; But the angle of these setting limited lock latch hook portion 722 perks is in preset range, referring to Fig. 9;

Said lock portion is one-body molded, and the lock buck plate of lock portion has vertical each other lock first fitting surface 710a and the lock second fitting surface 710b; The lock first fitting surface 710a can coincide with the terraced frame first fitting face 1a of main ladder frame or secondary terraced frame, the lock second fitting surface 710b with can coincide with the terraced frame second fitting face 1b of main ladder frame or secondary terraced frame; The terraced frame first fitting face 1a of this ladder frame is adjacent with the terraced frame second fitting face 1b and vertical each other; The second fitting surface 710b along the lock buck plate stretches out integrally formed lock hook portion 7101, referring to Figure 10;

This lock hook portion 7101 has fixed lock hook groove inclined-plane 71011; Form the fixed lock hook groove 7100 that satisfies preset angle between the first fitting surface 710a of this fixed lock hook groove inclined-plane and lock buck plate; This fixed lock hook groove is used to hold moving lock latch hook termination 72210, the preset angle of the preset angle of fixed lock hook groove and moving lock latch hook termination ' quite, to form the contact surface that fixed lock hook groove and moving lock latch hook termination match; Thereby reach the safe effect that hooks together, referring to Fig. 7;

This fixed lock hook groove inclined-plane 71011 forms the fixed lock hook end 71013 of satisfying preset angle β with the end face 71012 of lock hook portion; The preset angle β of this fixed lock hook end and the preset angle β ' of moveable lock hook groove are suitable; Forming the contact surface that fixed lock hook end and moveable lock hook groove match, thereby reach the safe effect that hooks together; Extending upward end face 71012 with hook portion along the lock second fitting surface 710b of lock buck plate crosses and forms the stupefied limit of lock portion 71014; The stupefied limit of said lock portion is the stupefied limit of circular arc; The stupefied limit of this lock portion is used to hold the moving lock sliding bevel 72214 of moveable lock hook end, referring to Fig. 7, Fig. 9;

The stupefied limit of the lock of lock hook portion portion 71014 considers when the major and minor terraced frame of ladder closes up with the configuration of the moving lock sliding bevel 72214 of moveable lock hook end especially; Promote major and minor ladder; Make the moving lock sliding bevel 72214 of moving lock latch hook portion collide the stupefied limit of the lock portion 71014 of lock hook portion, the stupefied limit of lock portion forms active force to the moving lock sliding bevel, and the active force that impels moving lock portion to overcome spring clockwise rotates around pivot 74; Referring to Figure 10; Therefore, close up major and minor ladder the time need not manpower special to moving lock force section 721 application of forces, can realize locking efficiently.

The moving lock latch hook portion 722 of said moving lock portion 72 is made up of moving lock hook portion 7221 and moving lock latch hook neck 7220; Form the hook-type hollow out in the middle of the moving lock hook portion of said moving lock latch hook portion and the moving lock latch hook neck; Not only save material thus; Can make simultaneously moving lock hook portion 7221 and moving lock latch hook neck 7220 form certain elasticity, referring to Figure 10;

This moving lock hook portion 7221 is used for combining with lock hook portion 7101 couplings; This moving lock hook portion has moveable lock hook groove inclined-plane 72211; Form the moveable lock hook groove 72213 that satisfies preset angle β ' (referring to Fig. 7) between this hook groove inclined-plane and the moving lock latch hook neck 7220; This moveable lock hook groove is used to hold fixed lock hook end 71013, and the preset angle β ' of moveable lock hook groove is suitable with the preset angle β of fixed lock hook end, to form the contact surface that moveable lock hook groove and fixed lock hook end match; Thereby reach the safe effect that hooks together, referring to Figure 10;

Moveable lock hook end 7221 has moveable lock hook groove inclined-plane 72211 and moving lock sliding bevel 72214; Form moving lock hook portion end face 72212 between moveable lock hook groove inclined-plane 72211 and the moving lock sliding bevel 72214; Moving lock hook portion end face 72212 forms with moveable lock hook groove inclined-plane 72211 and satisfies preset angle ' the moving lock latch hook termination 72210 of (referring to Fig. 7); The preset angle of this moving lock latch hook termination ' suitable with the preset angle of fixed lock hook groove 7100; Forming the contact surface that moving lock latch hook termination and fixed lock hook groove match, thereby reach the safe effect that hooks together, referring to Figure 10;

Further, moving lock hook portion end face 72212 is a horizontal plane basically, thereby the horizontal line L at moving lock hook portion end face and moving lock latch hook portion, place, moving lock force section is parallel to each other; Thus, can guarantee the entire normalization property of terraced frame locking element, also effectively improve the safety of element;

Said movable lock base part 70 has the pedestal buck plate 700 that can coincide with the terraced frame of secondary ladder or main ladder, and this pedestal buck plate has vertical each other pedestal first fitting surface 700a and the pedestal second fitting surface 700b;

The terraced frame first fitting face 2a of pedestal first fitting surface and secondary terraced frame or main ladder frame coincide; The terraced frame second fitting face 2b of pedestal second fitting surface and secondary terraced frame or main ladder frame coincide;

First pivot assembling 701a and the assembling of second pivot 701b that picks up the ears that picks up the ears is set on the said pedestal first fitting surface 700a; Be to stretch out and the pedestal ear wall portion 7001 that forms between the assembling of this first pivot is picked up the ears and the assembling of second pivot is picked up the ears along the pedestal second fitting surface 700b; This pedestal ear wall portion and first pivot assembling pick up the ears chamber of the integrally formed putting spring of 701b of 701a and the assembling of second pivot of picking up the ears; Be called spring installation portion 7001, referring to Fig. 9, Figure 10, Figure 11; Said pedestal ear wall portion 7001 has the pedestal ear wall portion top 70011 of satisfying preset height, and this pedestal ear wall portion top is responsible for " bowing " degree of moving lock latch hook portion 722 is formed restriction; When spring during in release conditions, moving lock force section 721 receives spring action, and moving lock portion integral body is bowed by revolving force effect impelling moving lock latch hook portion counterclockwise, and pedestal ear wall portion end face can prevent effectively that Stop-motion lock latch hook portion " bows " heartily; Can guarantee further that thus the stupefied limit of lock portion 71014 can form effectively slip along moving lock sliding bevel 72214;

Said spring 75 is by the spring spire 752 on the ability suit pivot and first exit 751 and second exit 750 of spring spire; This first exit 751 is used to replace moving lock force section 721; Second exit is embedded in the spring installation portion, receives replacing of the pedestal first fitting surface 700a, and first exit of said spring and second exit are the opposite tension force of active force; Form a kind of torsion spring structure; Said spring is used to act between moving lock force section and pedestal first fitting surface, makes moving lock form twisting resistance, referring to Fig. 9;

Further; Said spring 75 has two spring spires that structure is identical; The i.e. first spring spire 752a and the second spring spire 752b; Integrally formed exit changeover portion 751c between first exit 751a of the first spring spire and the first exit 751b of the second spring spire, thus, first exit of first spring spire formation " ㄇ " the shape structure that links to each other with first exit of the second spring spire and the exit changeover portion one between the two; Can make moving lock form more strong twisting resistance, effectively strengthen the clamping dynamics; The spring of this structure can obtain bigger twisting resistance, referring to Fig. 9 under equal materials situation;

Said first pivot assembling picks up the ears to have the upwards flange 7011a of protuberance, and second assembling is picked up the ears identical with the first pivot assembling structure, has the upwards flange 7011b of protuberance equally, and this flange plays position-limiting action to spring, referring to Fig. 9;

Referring to shown in Figure 10: apply masterpiece and be used for moving lock force section 721, moving lock latch hook portion 722 overcomes the elastic force of spring 75, makes moving lock portion break away from the constraint of lock portion.Keep acting on the pressure F1 (see figure 7) of moving lock force section 721, spur secondary terraced frame 2, major and minor terraced frame is separated, this moment, moving lock latch hook portion broke away from lock fully, was unlocking condition.The effect of pedestal ear wall portion forms restriction to " bowing " degree of moving lock latch hook portion;

Referring to shown in Figure 11: locking state: moving lock force section 721 is under the counter clockwise direction elastic force effect of spring 75, and moving lock latch hook portion 722 is locked at lock portion.

When major and minor terraced frame separates; The component of ladder frame lock are under the free state that does not stress; The secondary terraced frame 2 that promotion has moving lock portion closes up to 1 direction of the main ladder frame with lock portion; When the moving lock sliding bevel 72214 of moving lock latch hook portion collided the stupefied limit of the lock portion 71014 of lock hook portion, the stupefied limit of lock portion formed active force f1 (see figure 7) to the moving lock sliding bevel; The stupefied limit of lock portion clockwise rotates around pivot 74 along the active force that active force in the moving lock sliding bevel sliding process makes moving lock portion overcome spring; When portion does not contact with the moving lock sliding bevel up to the stupefied limit of lock; The stupefied limit of lock portion has just disappeared to the active force f1 of moving lock sliding bevel; Active force in the spring reset process is in moving lock force section 721, and the position is gone in fixed lock hook groove 7100 in the moving lock latch hook termination 72210 of moving lock latch hook portion, and be locking state this moment.

After the preferred embodiment that specifies, be familiar with this technological personage and can clearly understand, do not break away from following claim with spiritual under can carry out various variations and modification, and the present invention also is not subject to the embodiment of the embodiment that lifts in the manual.

Claims

1. ladder, comprise main ladder (1), secondary ladder (2) and be installed in main ladder with secondary ladder between terraced platform (3), it is characterized in that: terraced platform assembling structure is: said terraced platform (3) is gone up installation latch hook (5), and this latch hook is used to lock step; Said latch hook is integrally formed by department of assembly (51) and hooked part (52); This latch hook has preset thickness; Form department of assembly's crestal surface (510) and hooked part crestal surface (520); Said department of assembly crestal surface is the contact surface that coincide with terraced platform, and this department of assembly has the skidway hole (511,512) that appearance bearing pin (501,502) slides; The hooked part crestal surface has spring assembling bolt (521), is used for mounting spring (6); Spring (6) one end seats are on spring assembling bolt, and the other end holds by terraced platform (3) lateral wall; Said hooked part has the touching end that can touch step; This department of assembly and hooked part form the hook groove (54) that can hold step; The bottom of said terraced platform (3) has the assembly type groove (30) that latch hook is installed; Said assembly type groove has the pin shaft hole (301a, 301b) that appearance bearing pin (501,502) installs, and the abutment pin axis hole is provided with the bearing pin positive stop key (302a, 302b) that can limit the latch hook sliding position; Ladder frame lock (7) is installed on main terraced frame and the secondary terraced frame; Said terraced frame lock (7) is made up of moving lock portion (72), lock portion (71) and movable lock base part (70); Moving lock portion has the moving lock latch hook portion (722) that can hook together with the lock hook portion, and lock portion has the lock hook portion (7101) that can hook together with moving lock latch hook portion.

2. ladder according to claim 1; It is characterized in that: said terraced platform (3) lateral wall is stretched and is established spring containing cavity (303); This spring containing cavity has predetermined depth; This spring containing cavity is corresponding with the spring assembling bolt (521) of latch hook hooked part crestal surface, and this spring containing cavity is provided with spring fixed part (3036), and this spring fixed part (3036) is made up of two spring positive stop keys that can block spring; Described integrally formed moving lock latch hook portion of moving lock portion (722) and moving lock force section (721) form moving lock pivot hole (7234) between moving lock latch hook portion and moving lock force section; Spring (75) is by being pivotally mounted between movable lock base part (70) and the moving lock portion (72); Integrally formed lock buck plate (710) and the lock hook portion (7101) that can coincide with the terraced frame of main ladder or secondary ladder of said lock portion (71); The lock buck plate of said lock portion has lock first fitting surface (710a) and lock second fitting surface (710b); Second fitting surface (710b) along the lock buck plate stretches out formation lock hook portion (7101).

3. like the said ladder of claim 2, it is characterized in that: also dispose attacker (522) on the hooked part crestal surface of said latch hook; Be used to spur latch hook in the effect lower edge of spring skidway hole (511,512) direction slides in telescopic; The axle center of said moving lock pivot hole (7234) and moving lock latch hook portion and moving lock force section on same horizon or the axle center of moving lock pivot hole (7234) near the same horizon at moving lock latch hook portion and moving lock force section place.

4. like the said ladder of claim 3, it is characterized in that: step limiting section (304) is set on the terraced platform, is responsible for moving with latch hook engagement limits step; Said lock hook portion (7101) has fixed lock hook groove inclined-plane (71011), forms the fixed lock hook groove (7100) that satisfies preset angle between first fitting surface (710a) of this fixed lock hook groove inclined-plane and lock buck plate; This fixed lock hook groove inclined-plane (71011) forms the fixed lock hook end (71013) of satisfying preset angle with the end face (71012) of lock hook portion; The moving lock latch hook portion (722) of said moving lock portion (72) is made up of moving lock hook portion (7221) and moving lock latch hook neck (7220); This moving lock hook portion (7221) has moveable lock hook groove inclined-plane (72211); Form the moveable lock hook groove (72213) that satisfies preset angle between this hook groove inclined-plane and the moving lock latch hook neck (7220); The moving lock hook portion of said moving lock portion has moveable lock hook groove inclined-plane (72211) and moving lock sliding bevel (72214); Form moving lock hook portion end face (72212) between moveable lock hook groove inclined-plane (72211) and the moving lock sliding bevel (72214), moving lock hook portion end face (72212) forms the moving lock latch hook termination (72210) of satisfying preset angle with moveable lock hook groove inclined-plane (72211).

5. like the said ladder of claim 4, it is characterized in that: said step limiting section (304) is provided with 2 or 3 or 4; Said lock portion extends upward end face (71012) with the lock hook portion along lock second fitting surface (710b) of lock buck plate and crosses and form lock stupefied limit portion (71014), and the stupefied limit of this lock portion can contact the moving lock sliding bevel (72214) of moving lock hook portion.

6. like the said ladder of claim 5, it is characterized in that: the step limiting section of the assembly type groove (30) in the said terraced platform, bearing pin positive stop key (302a, 302b), spring containing cavity (303), spring fixed part (3036), terraced platform is all one-body molded; Form the hook-type hollow out in the middle of the moving lock hook portion of said moving lock latch hook portion and the moving lock latch hook neck; The stupefied limit of said lock portion is the stupefied limit of circular arc.

7. ladder as claimed in claim 6 is characterized in that: also have connecting rod (4) to be installed on the terraced platform, be responsible for secondary ladder of drive and main ladder and close up; The fixed end of connecting rod is journaled on the terraced platform, and connecting rod can rotate around terraced platform; The free end of connecting rod is connected with the step (20) of secondary ladder or main ladder; Said movable lock base part (70) has the pedestal buck plate (700) that can coincide with the terraced frame of secondary ladder or main ladder, and this pedestal buck plate has pedestal first fitting surface (700a) and pedestal second fitting surface (700b); Be provided with on said pedestal first fitting surface (700a) first pivot assembling pick up the ears (701a) assemble pick up the ears (701b) with second pivot; Between picking up the ears, this first, second pivot assembling forms the spring installation portion (7001) of putting spring; Said spring (75) have can suit spring spire (752) and first exit (751) and second exit (750) of spring spire on the pivot; This first exit (751) is used to replace moving lock force section (721); Second exit is embedded in the spring installation portion, receives replacing of pedestal first fitting surface (700a).

8. ladder as claimed in claim 7; It is characterized in that: said connecting rod one end has first pilot hole (42) that can be sleeved on the step (20); The other end of connecting rod has second pilot hole (43) that can be installed in terraced platform fixed position, and first pilot hole is greater than second pilot hole, the integrally formed pilot hole flange in the edge of first pilot hole and second pilot hole; And first pilot hole, second pilot hole all have endoporus and meet face, this endoporus meet face can be assembled member formation face and contact; Said spring (75) has two spring spires that structure is identical; The i.e. first spring spire (752a) and the second spring spire (752b), integrally formed exit changeover portion (751c) between first exit (751a) of the first spring spire and first exit (751b) of the second spring spire.

9. ladder as claimed in claim 8; It is characterized in that: two circumscribed lines between first pilot hole of said connecting rod and second pilot hole form first, second edge of connecting rod, the outside flange (41) of first, second edge of this connecting rod and first pilot hole and the integrally formed connecting rod of the second pilot hole outer rim; Ladder frame lock (7) is installed on main terraced frame and the secondary terraced frame, and first pivot assembling of said movable lock base part is picked up the ears, (7011a, 7011b) picked up the ears all have defining flange in the assembling of second pivot.

10. ladder as claimed in claim 9 is characterized in that: said connecting rod integrated injection molding, and the middle part of this connecting rod has hollow hole; Moving lock hook portion end face (72212) is parallel to each other with the horizon at moving lock latch hook portion, place, moving lock force section; The assembling of first pivot of said pedestal first fitting surface (700a) pick up the ears (701a) assemble with second pivot and pick up the ears to have pedestal ear wall portion (7001) between (701b); Said pedestal ear wall portion (7001) has pedestal ear wall portion top (70011) that satisfies preset height, and this pedestal ear wall portion top is used for moving lock latch hook portion is formed restriction.