CN2569650Y - No load locking device for folding chair - Google Patents

Abstract

The utility model discloses a no load locking device for a rotary chair. The utility model provides a rolling pulley component for chair feet of the rotary chair to prevent the rotary chair from being sat idle, the rolling pulley component has the advantages of relatively simple structure, excellent mechanical performance, and convenient and reliable manufacture and installation. The rolling pulley component for the chair feet is composed of a casing, a pulley, a supporting body, a connecting component and a spring. The utility model has characteristic of the no load locking, the wheel chair can conform to people 's can and slide at will after the definite load capacity is achieved, and the position where the rolling pulley is placed is not be relied on. The principle of the utility model is that the spring is compressed by the load on the rotary chair and the counter-force of the ground to the rolling pulley, inner teeth on the rolling pulley on the ground and a stationary tooth block do the up and down movement in the opposite directions, the inner teeth on the rolling pulley is disengaged from the stationary tooth block, and the rolling pulley rotates freely; inversely, the spring is elongated during no load, and the inner teeth on the rolling pulley on the ground and the stationary tooth block are meshed to lock the rolling pulley. The structure is suitable for various types of movable rotary chairs.

Description

The unloaded locking device of swivel chair

Technical field

This practical new technology relates to a kind of movable swivel chair rolling pulley assembly of novel unloaded locking.

Background technology

Swivel chair commonly used tends to take place to sit empty situation, and a shake-up swivel chair will move slightly when the people down sits, and brings inconvenient factor to life.Also have swivel chair can move, might produce destructive grazing, always want to avoid the generation of this situation in the life at strong wind or other factors shake-up.

Summary of the invention

The purpose of this utility model is exactly that rolling pulley assembly at above-mentioned swivel chair chair pin improves, and provides that a kind of structure is simple relatively, good mechanical performance, the convenient and reliable swivel chair chair pin rolling pulley assembly of fabrication and installation.

The unloaded locking device of swivel chair is divided into shell, pulley, supporting body, connecting piece and spring and forms.Its characteristics are exactly unloaded locking: when the adult is sitting on the chair, and the rolling pulley freedom of movement; When nobody's seat or seat child, the pulley of wheelchair just can not roll.In other words be exactly that the will that wheelchair just can meet the people after the loading capacity that reaches certain is slided arbitrarily, and do not rely on the residing position of rolling pulley.The principle of this novel practical is exactly to utilize load on the swivel chair and ground to make the spring compression in the face of the counter-force of rolling pulley, internal tooth on the ground surface pulley and fixed teeth piece are done rightabout moving up and down, the internal tooth of rolling pulley is thrown off with fixing tooth piece, and rolling pulley is freely rotated; Otherwise when unloaded, the spring elongation makes internal tooth and fixing tooth piece snap-lock rolling pulley on the ground surface pulley.This structure is applicable to various types of movable swivel chairs.

Specific implementation method

See Figure of description: Fig. 1 is a central vertical face master cutaway view

Fig. 2 is the right cutaway view of horizontal longitudinal axis vertical plane

Fig. 3 is a vertical plane master cutaway view on the pulley

Fig. 4 is the structural representation behind part number of components and the evolution

Shell 1 is a space structure body that three side sealing closes, and establishes vertical floor 2 in the top, and cross rib plate 3 is established in front and back; Rolling pulley 4 is located in the shell 1, shell 1 is partly exposed in the bottom, establishes circular floor or spoke 5 in the rolling pulley 4, and rolling pulley 4 centers are provided with jointing holes sliding shaft sleeve 6, and be connected with circular floor 5, rolling pulley 4 edges are provided with braking rake tooth 7 by center inside; Supporting body 8 is main force structure and control pieces, it closely contacts with shell 1 on the one hand, form stressed integral body, at first bear load on the other hand from rolling pulley 4, supporting body 8 should be controlled the rotation of rolling pulley 4 by the size of load as control piece, and control is provided with the deflection of the spring 9 in it again, supporting body 8 is provided with three slotted eyes: the one, and the stressed longitudinal axis 10 jacks that opening makes progress, the load on the wheelchair passes to ground surface pulley 4 by the stressed longitudinal axis 10; The 2nd, the perforation 12 of the horizontal longitudinal axis 11 that level is ganged up, horizontal longitudinal axis 11 can be up and down in perforation 12; The 3rd, the vertical channel of built-in spring 9 that Open Side Down and vertical in its lower section slide block up and down 13.The both sides of supporting body 8 also be provided with rolling pulley 4 on corresponding fixed gear piece 14, when fixed gear piece 14 just interlock mutually when stop rake tooth 7 on the rolling pulley 4 contacts, rolling pulley 4 just can not rotate.Slide block 13 is passed by horizontal longitudinal axis 11 equally up and down, rolling pulley 4 is passed to horizontal longitudinal axis 11 with the counter-force that the swivel chair load produces, slide block up and down 13 on the horizontal longitudinal axis 11 is moved up and down under the effect of spring 9, and horizontal longitudinal axis 11 and rolling pulley 4 is the tight binding integral body except that rolling pulley 4 can independently rotate with slide block 13 threes up and down.

Because horizontal longitudinal axis 11 and rolling pulley 4 is the tight binding integral body except that rolling pulley 4 can independently rotate with slide block 13 threes up and down, operation principle is exactly when load on the swivel chair passes to supporting body 8 by the shell 1 and the stressed longitudinal axis 11, form a pair of power simultaneously between this integral body and the supporting body 8, spring 9 in the supporting body 8 is compressed, the internal tooth of rolling pulley 4 upper tops and the fixed teeth piece 14 on the supporting body 8 are done reciprocal moving both vertically, the two disengagement, rolling pulley 4 just can freely rotate; Otherwise load disappears or when reducing to a certain degree, spring 9 elongations, and the internal tooth of rolling pulley 4 upper tops and the fixed gear piece 14 on the supporting body 8 are done reciprocal moving both vertically, and the two interlock makes the rotation of rolling pulley 4 locked.

Because there is suitable distance the center of the stressed longitudinal axis 10 with the center of rolling pulley 4,, adjust the quantity of said apparatus part parts and the device that the position just can obtain another structure according to operation principle.As two rolling pulleies 4 are kept to one, and, a supporting body 8 is increased to two its centering position, place the both sides of a rolling pulley 4 respectively, its left upper portion connects to whole also still can insert the stressed longitudinal axis 10, just obtains this novel practical structure of another kind of form.See Figure of description 4.This structure is applicable to various types of movable swivel chairs.

Claims (1)

1, the unloaded locking device of a kind of swivel chair is made up of shell (1), pulley (4), supporting body (8), connecting piece and spring (9), it is characterized in that shell (1) is a space structure body that three side sealing closes, and establishes vertical floor (2) in the top, and cross rib plate (3) is established in front and back; Rolling pulley (4) is located in the shell (1), shell (1) is partly exposed in the bottom, establishes circular floor or spoke (5) in the rolling pulley (4), and the center is provided with jointing holes sliding shaft sleeve (6), and be connected with circular floor (5), pulley (4) edge is provided with braking rake tooth (7) by center inside; The vertical channel of built-in spring of supporting body (8) (9) and slide block up and down (13) vertical below spring (9), the stressed longitudinal axis (10) connects to one to housing (1) and supporting body (8), the both sides of supporting body (8) also are provided with and rolling pulley (4) is gone up corresponding fixed gear piece (14), horizontal longitudinal axis (11) and rolling pulley (4) and up and down slide block (13) three be the tight binding integral body except that rolling pulley (4) can independently rotate.

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