CN2610056Y

CN2610056Y - Telescopic ladder

Info

Publication number: CN2610056Y
Application number: CN 03230123
Authority: CN
Inventors: 钱贤平
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-08
Filing date: 2003-04-08
Publication date: 2004-04-07
Anticipated expiration: 2013-04-08

Abstract

The utility model relates to a retractable ladder, which comprises two vertical bars arranged against each other and multi cross bars fixed between the two vertical bars, wherein the vertical bars al least comprise two retractable sleeves, at least one cross bar is provided between two sleeves of the same set and against each other, the cross bar is at least hollow at the connecting part with the vertical bar and provided with pin capable of being plugged in corresponding hole of the adjacent sleeve and retractable control device of the pin. The utility model is characterized in that the sleeve is provided on the bottom with a limit socket which outer diameter is a little bigger than outer diameter of the sleeve, the adjacent sleeve sleeved on the sleeve is provided in the middle with a circle of hollow tendons which inner diameter is a little smaller than outer diameter of the limit socket, the limit socket is provide with venting grooves. To compare with prior art, the utility model can effectively protect adjacent sleeves being draught out in accident. The device of the limit socket venting grooves can make air in the sleeve come in and out freely when the ladder is extending, which makes intending more convenient and stable.

Description

A kind of telescopic ladder

Technical field

The utility model relates to a kind of ladder, particularly a kind of telescopic ladder.

Background technology

Traditional ladder is by two opposing parallel or be the montant of trapezoidal setting and many whippletrees being fixed between this two montant constitute, and its length is fixed, and can't stretch, and carries, moves, carries inconvenience, and it is big to take up space when depositing.For this reason, the extension ladder of telescopic antenna formula is devised, its structure is generally, two relative montants are designed to be made of the more piece telescope, with linking to each other with a whippletree between two relative sleeve pipes of joint, whippletree is at least in the position hollow that links to each other with montant, and therein the bayonet lock and the extension and contraction control mechanism thereof that can penetratingly insert corresponding aperture on the adjacent casing is set." ladder " as Japanese laid-open patent JP06-341281 (disclosing), " extension ladder " (notification number is CN2268119Y) of China utility model patent ZL96248337.0, " sleeve pipe extension ladder " (notification number is CN2361820Y) of China utility model patent ZL98249499.8 all discloses the extension ladder of this class formation, particularly adopted foldable spanner to handle bayonet lock among the JP06-341281, not only easy to use, and when ladder is in contraction state, spanner also is in folding state, make the ladder after the contraction more clean and tidy, occupied space is also littler.

In fact, this extension ladder can bring other problem in use, the one, bayonet lock wherein generally is designed to can automatically insert corresponding aperture on the adjacent casing when adjacent bushings is drawn back and makes both lock-bits, but also unexpected situation may appear, in case the automatic insertion of bayonet lock is malfunctioning, then adjacent casing has by the possibility of pull-off; Be when ladder is in complete stretched condition, leave more air between its adjacent casing, and when ladder progressively shrinks, if these air do not have specific passage in time to release, will be compressed, thereby cause resistance when shrinking, equally, when ladder when contraction state is progressively upheld, if there is not specific passage that outside air is imported in the sleeve pipe, also can cause the resistance of extension; The 3rd, this extension ladder generally can adopt metal materials such as aluminium alloys, stainless steel, and whippletree since the person's weight of need bearing the ascending stair and must with the sleeve pipe of montant between firmly is connected, and, be difficult to manufacturing in practice as disclosed structure among the JP06-341281; In addition, the bayonet lock among the JP06-341281 is on the support that directly is located in the whippletree one, and this mode also is difficult to realize in reality.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of at above-mentioned prior art present situation can prevent effectively that adjacent casing is by the telescopic ladder of pull-off under unexpected situation.

Another technical problem to be solved in the utility model provides a kind of less telescopic ladder of resistance when flexible.

A technical problem more to be solved in the utility model provides a kind of telescopic ladder of being convenient to make.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this telescopic ladder comprises two montants that are oppositely arranged and is fixed on many whippletrees between this two montant, montant wherein includes two joint telescopes at least, between two relative sleeve pipes, be fixed with at least one whippletree with joint, the position hollow that whippletree is linking to each other with montant at least, and bayonet lock and the extension and contraction control mechanism thereof can penetratingly insert corresponding aperture on the adjacent casing be set therein, it is characterized in that being provided with a stop collar at described sleeve bottom, its external diameter is slightly larger than the external diameter of this sleeve pipe, another adjacent casing that is enclosed within outside this sleeve pipe then is provided with a circle concave bar at medium position, and the internal diameter of this concave bar is slightly less than the external diameter of described stop collar.

Described stop collar can have ventilative hole slot, so that extension ladder is more light, steady when flexible; The hole slot of should breathing freely can be opened side or the end face at stop collar.

Described cross bar two ends are connected to good with the sleeve pipe by adapter sleeve and montant, this adapter sleeve is fixed in outside the sleeve pipe in the close-fitting mode, and the tubulated ends of cross bar is fixed in outside the adapter sleeve in the close-fitting mode again.Like this, described adapter sleeve can adopt the rubber and plastic material that can be out of shape slightly, so that connect more fastening.

Described bayonet lock extension and contraction control mechanism can adopt existing various structure, but preferably, can adopt following structure, it comprises bayonet lock seat, spanner and back-moving spring, the bayonet lock seat is fixed in the whippletree, described bayonet lock then be positioned at the bayonet lock seat and can be relatively its slide, and the afterbody of bayonet lock is by the back-moving spring support that is positioned at bayonet lock seat afterbody, the middle part of bayonet lock has a thin neck; Spanner is the L type, and its head is forked and is embedded thin neck at bayonet lock, and its kink then has the position of protruding both sides and the corresponding site of bayonet lock seat is articulated, and its afterbody passes whippletree and exposes at the hole slot of corresponding site setting.When ladder shrinks, lower floor's whippletree is answered back to the L type spanner afterbody in this layer whippletree, and spanner is around its pivoted, and drives in the bayonet lock withdrawal whippletree, compression reseting spring simultaneously, this moment this layer cross bar correspondence sleeve pipe and last joint sleeve pipe between relative slip and contraction take place because of bayonet lock no longer acts on.

And,, therefore a draw ring can be set when shrinking at the afterbody of L type spanner because of ladder does not descend the whippletree of one deck can collide its L type spanner again for the pairing whippletree of a bottom joint telescopic sleeve pipe, use with convenient.

Compared with prior art, the utility model cooperates with the concave bar of sleeve pipe by the stop collar of setting up, and can prevent effectively that adjacent casing is by pull-off under unexpected situation; And the setting of ventilative hole slot on the stop collar can make ladder when flexible, and air passes in and out freely in the sleeve pipe, thereby makes expanding-contracting action more light, steady; Be connected by adapter sleeve between whippletree and the sleeve pipe, both can have made connection more firm, also made things convenient for assembling; Simultaneously, by in whippletree, setting up the bayonet lock seat, also further facilitated and made and assembling.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment.

Fig. 2 is an I portion enlarged drawing among Fig. 1.

Fig. 3 is the A-A sectional view of Fig. 2.

Fig. 4 is an II portion enlarged drawing among Fig. 1.

Fig. 5 is an III portion enlarged drawing among Fig. 1.

Fig. 6 is the B-B sectional view of Fig. 5.

Fig. 7 is an IV portion enlarged drawing among Fig. 1.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 1～shown in Figure 7, this telescopic ladder comprises two montants that are oppositely arranged 1 and is fixed on many whippletrees 2 between this two montant;

Montant 1 wherein includes two joint telescopes 11～15 at least, is fixed with at least one whippletree 2 between two relative sleeve pipes with joint;

Whippletree 2 is at least in the position hollow that links to each other with montant 1, and as shown in Figure 2, whippletree 2 is provided with the bayonet lock 2 and the extension and contraction control mechanism thereof that can penetratingly insert

corresponding aperture

12a, 11a on the

adjacent casing

12,11 therein in the contiguous position hollow that links to each other with sleeve pipe 12;

As Fig. 2, shown in Figure 3, bayonet lock extension and contraction control mechanism comprises and bayonet lock seat 8, spanner 4 and back-moving spring 9, bayonet lock seat 8 is fixed in the

whippletree

2,3 of described bayonet locks are positioned at bayonet lock seat 8 and its slip relatively, and the afterbody of bayonet lock 3 is supported by the back-moving spring 9 that is positioned at bayonet lock seat 8 afterbodys, and the middle part of bayonet lock 3 has a thin neck 31; Spanner 4 is the L type, and its head is forked and is embedded thin neck 31 at bayonet lock, and the corresponding site that its kink then has the position 42 of protruding both sides and bayonet lock seat 8 is articulated, and its afterbody passes whippletree 2 and exposes at the hole slot 21 of corresponding site setting.When ladder shrinks, lower floor's whippletree 2 is answered back to L type spanner 4 afterbodys in this layer whippletree 2, spanner 4 rotates around its pivot 42, and drive in the bayonet lock 3 withdrawal whippletrees 2, compression reseting spring 9 simultaneously, this moment this layer cross bar correspondence sleeve pipe 12 and last joint sleeve pipe 11 between relative slip and contraction take place because of bayonet lock 3 no longer acts on;

As shown in Figure 4, described cross bar 2 two ends link to each other by adapter sleeve 7 these joint sleeve pipes 14 corresponding with it of rubber and plastic material, and this adapter sleeve 7 is fixed in outside the sleeve pipe 14 in the close-fitting mode, and the tubulated ends 22 of cross bar is fixed in outside the adapter sleeve 7 in the close-fitting mode again;

Bottom at each joint telescopic sleeve pipe is provided with a stop collar 5, as Fig. 5, shown in Figure 6, the external diameter of stop collar 5 is slightly larger than the external diameter of its this section sleeve pipe 13, the following joint sleeve pipe 14 that is enclosed within outside the sleeve pipe 13 then is provided with a circle concave bar 14a at medium position, and the internal diameter of this concave bar 14a is slightly less than the external diameter of described stop collar 4; Described stop collar also has ventilative hole slot 51 in its side, so that extension ladder is more light, steady when flexible;

As Fig. 1, shown in Figure 7, for the pairing whippletree 2 of a bottom joint telescopic sleeve pipe, the afterbody of its L type spanner 4 also is provided with a draw ring 41, uses with convenient.

Claims

1, a kind of telescopic ladder, comprise two montants that are oppositely arranged and be fixed on many whippletrees between this two montant, montant wherein includes two joint telescopes at least, between two relative sleeve pipes, be fixed with at least one whippletree with joint, the position hollow that whippletree is linking to each other with montant at least, and bayonet lock and the extension and contraction control mechanism thereof can penetratingly insert corresponding aperture on the adjacent casing be set therein, it is characterized in that being provided with a stop collar at described sleeve bottom, its external diameter is slightly larger than the external diameter of this sleeve pipe, another adjacent casing that is enclosed within outside this sleeve pipe then is provided with a circle concave bar at medium position, and the internal diameter of this concave bar is slightly less than the external diameter of described stop collar.

2, telescopic ladder according to claim 1 is characterized in that described stop collar has ventilative hole slot.

3, telescopic ladder according to claim 1, it is characterized in that described cross bar two ends link to each other with the sleeve pipe of montant by adapter sleeve, this adapter sleeve is fixed in outside the sleeve pipe in the close-fitting mode, and the tubulated ends of cross bar is fixed in outside the adapter sleeve in the close-fitting mode again.

4, telescopic ladder according to claim 3 is characterized in that described adapter sleeve adopts the rubber and plastic material.

5, according to appointing the described telescopic ladder of claim in the claim 1 to 4, it is characterized in that described bayonet lock extension and contraction control mechanism comprises bayonet lock seat, spanner and back-moving spring, the bayonet lock seat is fixed in the whippletree, described bayonet lock then is positioned at bayonet lock seat and its slip relatively, and the afterbody of bayonet lock is supported by the back-moving spring that is positioned at bayonet lock seat afterbody, and the middle part of bayonet lock has a thin neck; Spanner is the L type, and its head is forked and is embedded thin neck at bayonet lock, and its kink then has the position of protruding both sides and the corresponding site of bayonet lock seat is articulated, and its afterbody passes whippletree and exposes at the hole slot of corresponding site setting.

6,, it is characterized in that the afterbody of its L type spanner is provided with a draw ring in the pairing whippletree of a bottom joint telescopic sleeve pipe according to appointing the described telescopic ladder of claim in the claim 1 to 4.

7, telescopic ladder according to claim 5 is characterized in that the afterbody of its L type spanner is provided with a draw ring in the pairing whippletree of a bottom joint telescopic sleeve pipe.

8,, it is characterized in that the bottom of its montant is provided with anti-sliding sleeve or slipmat according to appointing the described telescopic ladder of claim in the claim 1 to 4.

9, telescopic ladder according to claim 5 is characterized in that the bottom of its montant is provided with anti-sliding sleeve or slipmat.

10, telescopic ladder according to claim 6 is characterized in that the bottom of its montant is provided with anti-sliding sleeve or slipmat.