The extension ladder underframe
Technical field
The utility model relates to a kind of bindiny mechanism, relates in particular to a kind of connection underframe that folds that is applicable on the extension ladder.
Background technology
In daily life, many daily necessitiess and power tool etc. all are designed to the collapsible structure that folds, like this; When not using with the instrument folding; Take volume with minimizing, can save the space of depositing on the one hand, can make things convenient for the user to go out to carry on the other hand; Therefore, various folding articles for use and instrument play very important effect to the comfortableness of people's daily life and the convenience of trip; Common extension ladder in the daily life for example; Its feet can stretch as the fishing bar and shorten, and can be used for supporting people's work high above the ground after the stretching, and after shortening; Can be placed in the closet of family, in the study, under the bed or in the boot of automobile etc., can carry easily and deposit; Now, extension ladder because of its lighter weight, fold the less height in back, and safety preferably when using, more and more receive people's welcome.But the folding retracting mechanism that more existing extension ladders are provided with on it is too complicated, part is various, causes to fold the process complicacy, and it is convenient inadequately to fold operation, is not easy to use.
Therefore, be necessary to provide a kind of simple in structure, fold the deficiency that easy and simple to handle and stable high bindiny mechanism solves prior art.
The utility model content
The purpose of the utility model be to provide a kind of simple in structure, fold easy to operate and stable high extension ladder underframe.
For realizing above-mentioned purpose; The technical scheme of the utility model is: a kind of extension ladder underframe is provided; It is connected in the bottom of two feets of extension ladder, and said feet comprises the tube connector assembly, and said tube connector assembly comprises at least two tube connectors of socket successively; Said extension ladder underframe comprises connector, sliding part, fastener and return unit; Said connector is hollow structure, and said connector is fixedly connected between the tube connector of lower end of two feets, and said sliding part is corresponding respectively to be sheathed in the two ends of said connector slidably; Said return unit is arranged in the said connector and two ends are respectively flexibly and conflict with said sliding part, and said fastener is fixed in the lower end that is positioned at inner said tube connector and inconsistent with said connector, sliding part separably.
Preferably; Being positioned at said tube connector assembly tube connector bottom is first tube connector; With the tube connector of the said first tube connector socket be second tube connector; Said fastener is fixed in the lower end of said second tube connector, and the lower end telescopically of said second tube connector is contained in the upper end of said first tube connector, and the lower end of said first tube connector is fixedly connected with said connector; Said fastener is inconsistent with said connector, sliding part separably, and said fastener is used for the underframe after folding is positioned.
Preferably, said fastener has the engagement pin that is elasticity and protrudes out said second tube connector, and said engagement pin is inconsistent with said connector, sliding part separably; Be flexible engagement pin, can be sticked in easily on connector, the keeper, and can realize automatically reseting, make that operation is more easy.
Preferably, said fastener also comprises block base, runs through offering installing hole on the said block base; Said engagement pin is arranged in the said installing hole slidably; And the upper end of said engagement pin is provided with the engaging post, and the upper end of said engaging post and said block base is inconsistent, and the lower end of said engagement pin has boss; Also be arranged with spring on the said engagement pin; Said spring is and flexibly contacts between said block base and the said boss, and block base makes being provided with of engagement pin simple, and the lower end that is installed on second tube connector that can simple and fast.
Preferably; The end of said connector offers and corresponding first connecting hole in the lower end of said engagement pin; Said engagement pin is sticked in said first connecting hole separably; When said feet folded, first tube connector folded and makes said engagement pin to be sticked in said first connecting hole downwards, thereby feet is positioned.
Preferably; Being positioned on the outer end of said connector of said sliding part offers and corresponding second connecting hole in the lower end of said engagement pin; Said engagement pin is sticked in said second connecting hole separably, and when engagement pin was sticked in said first connecting hole, the sliding part said engagement pin of conflicting was compressed it; Inwardly promote said sliding part; Sliding part slides into second connecting hole on it when corresponding with engagement pin along connector, and engagement pin ejects also and is sticked in said second connecting hole, thereby sliding part is positioned.
Preferably; Said return unit comprises Connection Block, holder, connecting rod and elastic component, and said Connection Block is fixed in an end that is positioned at said connector of said sliding part, and said holder is fixed in the said connector; Said connecting rod passes said holder and two ends are slidably connected on the said Connection Block; Said elastic component is sheathed on outside the said connecting rod and is and flexibly contacts between said Connection Block and the said holder, and when the feet of extension ladder was opened, fastener withdrawed from second connecting hole on the sliding part; Sliding part resets under the elastic force effect of elastic component; Thereby be used to support whole extension ladder, make extension ladder have better stability, it is very easy to open the operation that said extension ladder submits simultaneously.
Preferably; Said Connection Block comprises the pedestal that is hollow structure, and a side of said pedestal is provided with the first circular contact part, and the end of said connecting rod has the reference column of protrusion; Said connecting rod passes said first contact part and said pedestal successively; And the opposite side of said reference column and said pedestal is inconsistent, Connection Block simple in structure, and can be fixedly connected with sliding part easily.
Preferably; Said holder is the bending laminated structure; One end of said holder is fixed on the said connector; The two sides of the other end of said holder are provided with two and are the second circular contact part, and said connecting rod passes said second contact part and inconsistent with said holder, and said elastic component is and flexibly contacts between said first contact part and said second contact part.
Preferably, said sliding part is positioned on the outer end of said connector and also is provided with keeper.
Compared with prior art; Because the extension ladder underframe of the utility model; It comprises connector, sliding part, fastener and return unit; Said connector is hollow structure, and said connector is fixedly connected between the tube connector of lower end of two feets, and said sliding part is corresponding respectively to be sheathed in the two ends of said connector slidably; Said return unit is arranged in the said connector and two ends are respectively flexibly and conflict with said sliding part, and said fastener is fixed in the lower end that is positioned at inner said tube connector and inconsistent with said connector, sliding part separably; When extension ladder folds, promote sliding part along the inside slide in opposition of connector, and fastener is contacted on connector and the sliding part simultaneously it is positioned; When extension ladder was opened, fastener withdrawed from connector and sliding part, sliding part under the effect of return unit to the two ends sliding opening; Thereby for extension ladder provides a bigger support portion; Make extension ladder have better stability, and said extension ladder underframe is simple in structure, the operation that folds or open is all comparatively easy.
Description of drawings
Fig. 1 is the structural representation of the utility model extension ladder underframe.
Fig. 2 is the decomposing schematic representation of the utility model extension ladder underframe.
Fig. 3 is the decomposing schematic representation of fastener among Fig. 2.
Fig. 4 is the structural representation of return unit among Fig. 2.
Fig. 5 is the structural representation of Connection Block among Fig. 4.
Fig. 6 is the user mode sketch map of the utility model extension ladder underframe.
Fig. 7 is the collapse state sketch map of the utility model extension ladder underframe.
The specific embodiment
With reference now to accompanying drawing, describe the embodiment of the utility model, the similar elements label is represented similar elements in the accompanying drawing.
Like Fig. 1, shown in Figure 2, the utility model extension ladder underframe 20 is applicable on the extension ladder that it is connected in the bottom of two feets 10 of extension ladder; Said feet 10 comprises the tube connector assembly, and said tube connector assembly comprises at least two tube connectors of socket successively, also is provided with locking mechanism between the two adjacent tube connectors; Be used to lock two tube connectors and can unlock, when need used extension ladder, the tube connector of said feet stretched each other and is fixed by locking mechanism; Be used to support extension ladder; When needs folded said extension ladder, locking mechanism unlocked and said tube connector is slided and shrinks, thereby folds said extension ladder; The utility model extension ladder underframe 20 is connected on the tube connector bottom of said feet 10, in use be used to support extension ladder and have stability preferably, and said extension ladder underframe 20 can be folded to reduce the volume of extension ladder.
In conjunction with Fig. 1, shown in Figure 2; In the present embodiment; Only the tube connector assembly bottom of feet 10 is described, the tube connector bottom of said tube connector assembly is first tube connector 110, with the tube connector of said first tube connector 110 sockets be second tube connector 120; All the other tube connectors of said tube connector assembly can be the 3rd tube connector, the 4th tube connector or the like by that analogy; Annexation between other tube connectors on the top of its tube connector assembly also can be analogized by this embodiment, and the technology that this is well known to those skilled in the art repeats no more at this.
In the present embodiment, said second tube connector, 120 telescopicallies are placed in the upper end of said first tube connector 110, also are provided with locking mechanism on first tube connector 110, and it is used to lock first tube connector 110 and second tube connector 120; Said extension ladder underframe 20 is fixedly connected on the lower end of first tube connector 110; It comprises connector 210, sliding part 220, keeper 230, fastener 240 and return unit 250; Said connector 210 is hollow strip structure; And said connector 210 is fixedly connected on the lower end of two first tube connectors 110; One end of two said sliding parts 220 is all corresponding to be contained in the two ends of said connector 210 slidably, and can slide along said connector 210, also is provided with keeper 230 at the other end of two said sliding parts 220; Return unit 250 is placed in the said connector 210 and two ends flexibly contact on the said sliding part 220; Said fastener 240 is fixed in the bottom of second tube connector 120; When feet 10 folds; Fastener 240, promotes sliding part 220 simultaneously and inwardly slides and fasten with said fastener 240 along connector 210, thereby feet 10 and said extension ladder underframe 20 are folded to lower slider and be sticked on the connector 210 with second tube connector 120.
Like Fig. 2, shown in Figure 3; Said fastener 240 comprises block base 241, engagement pin 242 and spring 243; Said block base 241 rounded structures, and run through on the block base 241 and offer installing hole 241a, it extends radially inwardly the upper end edge of said connecting hole 241a and forms a stop part 241b; The tapered structure in the lower end of engagement pin 242, and also have boss 242b in the lower end of engagement pin 242, and the upper end of said engagement pin 242 is provided with engaging post 242a, said spring 243 are sheathed on the engagement pin 242 and between engaging post 242a and boss 242b; Be installed on 241 last times of block base; Said engagement pin 242 is arranged in the said installing hole 241a slidably and two ends all protrude out said connecting hole 241a; And make the engaging post 242a and the stop part 241b on the block base 241 of its upper end inconsistent; Said spring 243 also is placed in the said installing hole 241a, and the two ends of spring 243 are and flexibly contact between said stop part 241b and the said boss 242b; Fastener 240 is installed on 120 last times of second tube connector, and block base 241 is placed in the lower end of second tube connector 120 and is fixedly connected with it, and makes the lower end of engagement pin 242 protrude second tube connector 120.
The two ends of said connector 210 all offer and corresponding first connecting hole 211 in the lower end of said engagement pin 242, and being positioned on the end outside the said connector 210 of sliding part 220 also offers and corresponding second connecting hole 221 in the lower end of said engagement pin 242, when said feet 10 folds; Second tube connector 120 folds and makes engagement pin 242 to be sticked in said first connecting hole 211 downwards; At this moment, the sliding part 220 said engagement pin 242 of upwards conflicting is compressed spring sheathed on the engagement pin 242 243; Inwardly promote said sliding part 220; Sliding part 220 is slided along connector 210, and when second connecting hole 221 on the sliding part 220 slides into when corresponding with engagement pin 242, engagement pin 242 loses conflict power and resets; Thereby be sticked in said second connecting hole 221, realize location sliding part 220.
Like Fig. 4, shown in Figure 5; Said return unit 250 comprises Connection Block 251, holder 252, connecting rod 253 and elastic component 254; Said Connection Block 251 is fixed on the end of the said connector 210 of being positioned at of said sliding part 220; Holder 252 is fixed in the connector 210, and connecting rod 253 passes said holder 252 and two ends are slidably connected on the said Connection Block 251, and said elastic component 254 is sheathed on outside the connecting rod 253 and is and flexibly contacts between Connection Block 251 and the holder 252; Particularly; Said Connection Block 251 comprises the pedestal 251a that is hollow structure, and said pedestal 251a is placed in the end of sliding part 220 and fixing with it, and the hollow structure of the hollow structure of pedestal 251a and connector 210 connects; The side over against holder 252 of pedestal 251a also is provided with one and is the first circular contact part 251b; One end of said connecting rod 253 protrudes out said pedestal 251a after passing the first contact part 251b and pedestal 251a successively, and has the reference column 253a of protrusion in the end of connecting rod 253, and the opposite side of reference column 253a and said pedestal 251a is inconsistent; And said holder 252 is the bending laminated structure; It comprises the first connecting portion 252a and the second connecting portion 252b of mutual bending; The first connecting portion 252a is fixed in the bottom of connector 210; The second connecting portion 252b and connector 210 are inconsistent; Also be respectively arranged with two in the second connecting portion 252b both sides and be the second circular contact part 252c, connecting rod 253 passes the said second contact part 252c and inconsistent with the second connecting portion 252b, and the other end of connecting rod 253 is slidably connected on another Connection Block 251; Said elastic component 254 is sheathed on outside the tube connector 253 and is and flexibly contacts between said first contact part 251b and the said second contact part 252c, and in the present embodiment, said elastic component 254 is preferably spring; Promote sliding part 220 and locate until being stuck part 210, thereby sliding part 220 is folded to connector 210, in this process along connector 210 inside slide in opposition; Sliding part 220 drives Connection Block 251 and inwardly moves; Thereby said elastic component 254 is compressed, and when opening, the elastic force of elastic component 254 automatically resets sliding part 220; Return unit 250 simple in structure, and make extension ladder underframe 20 fold and open all comparatively convenient.
In conjunction with Fig. 6, shown in Figure 7, to the utility model extension ladder underframe 20 fold and opening procedure is described.
When folding the feet 10 of extension ladder; Make the locking mechanism release the lock between first tube connector 110 and second tube connector 120, and promote second tube connector, 120 edges, first tube connector 110 to the lower slider contraction, when second tube connector 120 slides down to the bottom of first tube connector 110; Fastener 240 correspondences that are fixed in second tube connector, 120 lower ends are sticked on the said connector 210; The lower end correspondence that is the engagement pin 242 of fastener 240 is sticked in said first connecting hole 211, because an end of sliding part 220 is contained in the connector 210, therefore; When engagement pin 242 is sticked in first connecting hole 211; The lower end of engagement pin 242 contacts on the sliding part 240, and at this moment, the spring 243 in the fastener 240 is in confined state; Then; Promote sliding part 220 along connector 210 inside slide in opposition; Thereby sliding part 220 slides and promotes to be fixed in Connection Block 251 motions of its end; Thereby the elastic component 254 of compression return unit 250, when sliding part 220 slided into second connecting hole 221 offered on it corresponding to the position of engagement pin 242, engagement pin 242 loses conflicted and sheathed spring 243 is on it resetted; The elastic force effect of spring 243 makes engagement pin 242 move downward and be sticked in second connecting hole 221, thus 220 location of the sliding part after slip folded.
And in the process of opening extension ladder feet 10, upwards spur said second tube connector 120, so that first tube connector 110 and second tube connector 120 stretch each other, after second tube connector 120 is stretched, utilize locking mechanism that both are locked; Second tube connector 120 moves upward and drives fastener 240 and moves upward; Thereby make engagement pin 242 withdraw from said first connecting hole 211 and second connecting hole 221, at this moment, the elastic component of return unit 250 254 recovers elastic force and promotes sliding part 220 and outwards slide; Elastic component 254 is resetted; Like this, sliding part 220 cooperates bigger support portion of formation to be used to support extension ladder with connector 210, have steadiness preferably; And go back the simple in structure of extension ladder underframe 20, the operation of opening and folding is all very easy.
Described extension ladder underframe 20 structures of the utility model are not limited on extension ladder to be used, and also can be used for other similar bindiny mechanisms according to actual needs.
The setting of the structure of the feet 10 of the said extension ladder of the utility model, locking mechanism etc. and fixation principle etc. are technology well known to those of ordinary skill in the art, no longer do detailed explanation at this.
The above disclosed preferred embodiment that is merely the utility model can not limit the interest field of the utility model certainly with this, so according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.