CN2478455Y - Telescopic tube folding chair - Google Patents

Abstract

The utility model discloses a folding chair, which comprises front legs, back legs and a bearer. The back legs are connected riveted into a rotatable hinge by a rivet 1, through a connecting hinge. The front legs and a bearer are riveted into a rotatable hinge by a rivet 2. The bearer and a back leg ear slice are riveted into a rotatable hinge by a rivet 3. The back leg ear slice is welded on the back legs, and the connecting hinge is sleeved in a guide post, which can slide up and down in the back legs by a guide sleeve. When the guide post is thoroughly slipped into the guide sleeve, the chair is unfolded, and when in folding state, the front legs are flush with the back legs, and the folding volume is the smallest.

Description

A kind of telescoping tube type folding seat

The utility model relates to a kind of improvement of folding seat fold mechanism.

Folding seat has superimposed and has opened two states, needs when chair uses, diverge just opened can, take up room and can superimposedly pack up and will reduce, like this, be convenient to storage again, therefore, folding seat has been subjected to the welcome in market, but existing folding seat is some problem also, as stand on the folding seat dangerous, if the station the position lean on after, folding seat will be packed up naturally, disequilibrium, the person of standing can fall down; Although its two folding seat can superimposedly be packed up, generally do not accomplish to fit fully yet, still take than large space at transportation, storage process, for the high situation of freight charges, its folded state of long-distance transportation still needs further compression.

The purpose of this utility model is a kind of safe and reliable folding seat of design, and because seat rear end pressurized is just packed up automatically, simultaneously, folding seat realization folded state is not fitted fully, and the front and back leg flushes after folding, and further compression takes up room.

The utility model folding seat comprises foreleg 9, back leg 6 and seat frame 10, and back leg 6 is riveted into a rotatable hinge with foreleg 9 by rivet 1 by connecting hinge 8; Foreleg 9 is riveted into a rotatable hinge with seat frame 10 by rivet 2; Seat frame 10 is riveted into a rotatable hinge with back leg auricle 4 by rivet 3; Back leg auricle 4 is welded on the back leg 6; Connect hinge sleeve in lead 5; Lead 5 can slide up and down in back leg 8 by fairlead 7, thereby constitutes a connecting rod slider mechanism.When lead slipped in the fairlead fully, chair was an open mode, and when folded state, the front and back leg is parallel with the seat frame, and foreleg flushes with back leg, folding volume minimum.

Use said mechanism,, fold and the view of opening for folding seat referring to accompanying drawing: figure (4) for leg before and after the satisfied folding back flushes; Figure (5) folds and the simplified schematic diagram of opening for folding seat; Leg flushes (leg differs in 10 millimeters before and after comprising) before and after the folding back of its folding seat after folding, and the each several part size relationship is as follows:

Be expressed as follows in the formula: ABD represents foreleg, and ACE represents back leg, and BC represents a frame.AB=a BD=d BC=b AC=c CE=e DE=f δ represents the offset (its numerical value should be slightly larger than foreleg and back leg radius sum) of back leg connecting hole; ∠ ε represents the angle of inclination that a frame makes progress; ∠ β represents the angle on foreleg and ground; ∠ γ represents the angle on back leg and ground; λ represents the difference of back leg and preceding leg length.

The assembled view of the fold mechanism of Fig. 1 folding seat; Fig. 2 folding seat folds and the view of opening; Fig. 3 folding seat folds and the simplified schematic diagram of opening.

The utility model is described in further detail: variable declaration below in conjunction with the calculating that front and back leg folded state is flushed: ABD represents foreleg among the figure, and ACE represents back leg, and BC represents a frame.AB=a, BD=d, BC=b, AC=c, CE=e, DE=f, δ represent the offset (numerical value should be slightly larger than foreleg and back leg radius sum) of back leg connecting hole; ∠ ε represents the angle of inclination that a frame makes progress; ∠ β represents the angle on foreleg and ground; ∠ r represents the angle on back leg and ground; λ represents that back leg is at the folding back numerical value longer than foreleg.Condition: ground distance d is arrived in known foreleg first hole, foreleg and ground angle β, span f between the leg of front and back, the angle ε on seat frame and ground; When λ promptly meets design requirement less than 10 millimeters.In Δ ADE, known β, f, as long as establish r, Δ ADE just is determined, promptly designed chair is determined.Because this is in esse entity, so a, b, c, d, e, f are all greater than zero.(1) α＞0 is in Δ ADE, according to sine

In Δ ADE, according to sine, $c+e=\sqrt{{(a+d)}^2+f^2-2(a+d)f\cos \mathrm{\&beta;}}----\left(4\right)$ Advised when the a=0 by figure, r has minimum of a value r _MinMake a=0 substitution (3) and (4), and (4) substitution (3), $\sin {\mathrm{\&gamma;}}_{\min }=\frac{d\sin \mathrm{\&beta;}}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="Y0122396400081.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+f^2-2\mathrm{df}\cos \mathrm{\&beta;}}}----\left(5\right)$ Because back leg and ground angle r exist, so r _Max＜180 °-β.(6) λ is back leg exceeds foreleg after folding a numerical value.

AB+ BD+ λ=AC+ CB+ CE is got by folding diagrammatic sketch

∴?a+d+λ＝c+b+e

∴ λ=c+e-(a+d)+b (7) is got by (2)

Get by (9) $a=\frac{f}{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}\sin \mathrm{\&gamma;}-d---\left(10\right)$ In Δ ABC, ∠ ABC=γ-ε, ∠ ABC=180 °-β-γ is according to sine

(10) substitution (11), $b=\frac{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}{\sin (\mathrm{\&gamma;}-\mathrm{\&epsiv;})}\&lsqb;\frac{f}{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}\sin \mathrm{\&gamma;}-d\&rsqb;----\left(12\right)$ With (12), (9), (8) substitution (7), $\mathrm{\&lambda;}=\frac{f}{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}\sin \mathrm{\&beta;}-\frac{f}{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}\sin \mathrm{\&gamma;}+\frac{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}{\sin (\mathrm{\&gamma;}-\mathrm{\&epsiv;})}\&lsqb;\frac{f}{\sin (\mathrm{\&beta;}+\mathrm{\&gamma;})}\sin \mathrm{\&gamma;}-d\&rsqb;---\left(13\right)$ And when folding, it is consistent that the front and back leg is wanted; λ＜10mm when design, the folding back of leg same length before and after thinking.In sum, have Illustrate when separating that when inequation group (14) has the back leg angle that meets design requirement exists, promptly can design the chair that meets the demands.(3) according to claims (1), (2), the described right of these claims is mainly when folding seat is used connecting rod slider mechanism, and for making folding volume minimum, the angle on back leg and ground must satisfy inequation group (14).

Claims (2)

1, a kind of telescoping tube type folding seat comprises foreleg, back leg and seat frame, and back leg is connected into a rotatable hinge by connecting hinge and foreleg by rivet 1 willow; Foreleg merely is connected into a rotatable hinge with the seat frame by rivet 2; Seat frame and back leg auricle are connected into a rotatable hinge by rivet 3 willows; The back leg auricle is welded on the back leg; Connect hinge sleeve in lead; Lead can slide up and down in back leg by fairlead, thereby constitutes a connecting rod slider mechanism.

2, a kind of telescoping tube type folding seat according to claim 1 is characterized in that front and back, the folding back of its folding seat leg flushes (leg differs in 10 millimeters before and after comprising) after folding, and the each several part size relationship is as follows:

Be expressed as follows in the formula: ABD represents foreleg, ACE represents back leg, BC represents a frame, and AB=a BD=d BC=b AC=c CE=e DE=f δ represents the offset (its numerical value should be slightly larger than foreleg and back leg radius sum) of back leg connecting hole; ∠ ε represents the angle of inclination that a frame makes progress; ∠ β represents the angle on foreleg and ground; ∠ γ represents the angle on back leg and ground; ∠ λ represents the difference of back leg and preceding leg length.

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