CN114668595B - Self-locking mechanism and folding chair with same - Google Patents

Abstract

The invention relates to a self-locking mechanism and a folding chair with the mechanism, belonging to the technical field of daily necessities. The self-locking mechanism includes a first sleeve and a second sleeve that is fitted outside the first sleeve. The third sleeve One end of the sleeve is provided with annular teeth, the second sleeve is provided with an annular groove that engages with the annular teeth on the same side of the annular teeth, and the first sleeve is An arc-shaped guide groove is provided on the outer wall, and a slide block for sliding in the arc-shaped guide groove is provided on the inner wall of the second sleeve. When the slide block slides along the arc-shaped guide groove, the first sleeve and the second sleeve are Rotation and axial displacement occur between the two sleeves, and the annular teeth and the annular slot are engaged at least once. The folding chair includes the above-mentioned self-locking mechanism. The invention can realize self-locking and unlocking within 90° in the same direction and is convenient to use.

Description

Self-locking mechanism and folding chair with the same

Technical field

The invention relates to the technical field of daily utensils, and in particular to a self-locking mechanism and a folding chair with the mechanism.

Background technique

As we all know, chairs are daily utensils used for people to rest. In order to adapt to the use of different groups of people, the existing technology designs the chair to be used as a crutch, so that it has the function of sitting on the chair and the function of assisting walking, thereby adapting to the use of the elderly or patients.

When used as a crutch, the seat plate needs to be folded to expose the space between the two handles, so that the body can be positioned between the two handles and the hands can be held on the two handles. However, at this time, the seat board has no fixed structure and may turn down at any time, which affects walking on the chair. Therefore, when using it, you must use your body to resist it to prevent it from rotating. In this way, it is very troublesome and inconvenient to use.

Therefore, it is necessary to improve the existing seat structure so that it is fixed when in a high position and free when in a low position, thereby making it convenient for the elderly or patients to use it.

At the same time, the design of the self-locking mechanism must consider the folding angle. The seat panel can only rotate 90 degrees due to the limitations of the backrest and load-bearing body. Therefore, adaptable design is a priority.

Contents of the invention

In view of this, the purpose of the present invention is to provide a self-locking mechanism and a folding chair with the mechanism, which can complete self-locking and unlocking within 90°, so as to solve the problem of inconvenient use of the existing technology without a self-locking structure.

One aspect of the present invention is achieved through the following technical solutions:

The self-locking mechanism includes a first sleeve and a second sleeve that is sleeved on the outside of the first sleeve,

One end of the first sleeve is provided with annular teeth, and the second sleeve is provided with an annular groove that engages with the annular teeth on the same side of the end of the annular teeth.

The outer wall of the first sleeve is provided with an arc-shaped guide groove, and the inner wall of the second sleeve is provided with a slider for sliding in the arc-shaped guide groove. When the slider slides along the arc-shaped guide groove, , rotation and axial displacement occur between the first sleeve and the second sleeve, and the annular teeth and the annular slot are engaged at least once.

Further, the central angle of the arc-shaped guide groove is 90°.

Furthermore, the arc-shaped guide groove includes a self-locking section that is farthest axially from the annular teeth, and the self-locking section is a straight section with a central angle of 10°±5°.

Furthermore, the arc-shaped guide groove also includes an unlocking section connected to the self-locking section and having a central angle of 5°±2°.

Further, the arc-shaped guide groove also includes an inlet section that enters the self-locking section.

Furthermore, the arc-shaped guide groove also includes a free section, and the free section is connected with the unlocking section and the inlet section respectively.

Further, the arc-shaped guide groove also includes an initial section connected with the inlet section.

The second aspect of the present invention is achieved through the following technical solutions:

A folding chair, the folding chair is provided with two handles, a connecting rod is provided between the two handles, a seat plate is rotated on the connecting rod, and two rotating sleeves are provided on the seat plate. A self-locking structure as described above is provided between the sleeve and the connecting rod.

Further, the rotating sleeve is fitted and fixed on the second sleeve, the second sleeve is rotatably arranged on the connecting rod, and the first sleeve is slidably fitted on the connecting rod.

The beneficial effects of the present invention are:

In the present invention, the second sleeve is sleeved outside the first sleeve, latch teeth are provided on the end face of the first sleeve, latch grooves are disposed on the second sleeve, and arc-shaped guide grooves are disposed outside the first sleeve. , a slider is provided in the second sleeve. When the slider slides along the circumferential direction of the arc-shaped guide groove, the first sleeve and the second sleeve are rotated and axially displaced, so that the teeth and the groove are at least Click once to achieve self-locking. When the self-locking structure is used in a folding chair, the seat plate can be self-locked and fixed when it is in a high position and free when it is in a low position, preventing it from falling down when it is in a high position and affecting walking.

In short, through innovative design, the present invention can realize self-locking and unlocking within 90° in the same direction.

Other advantages, objects, and features of the present invention will, to the extent that they are set forth in the description that follows, and to the extent that they will become apparent to those skilled in the art upon examination of the following, or may be derived from This invention is taught by practicing it. The objects and other advantages of the invention may be realized and obtained by the following description.

Description of the drawings

Figure 1 is a three-dimensional schematic diagram of the self-locking mechanism of the present invention.

Figure 2 is a three-dimensional schematic diagram of the first sleeve of the present invention;

Figure 3 is a front view of Figure 2;

Figure 4 is a top view of Figure 2;

Figure 5 is a three-dimensional schematic diagram of the second sleeve of the present invention;

Figure 6 is a front view of Figure 5;

Figure 7 is a top view of Figure 5;

Figure 8 is a three-dimensional schematic diagram of the folding chair of the present invention;

Figure 9 is a schematic diagram of the seat panel of the folding chair according to the present invention after it is folded;

Figure 10 is a detailed structural diagram of the arc guide groove.

Reference signs:

1-First sleeve; 2-Second sleeve; 3-Annular teeth; 4-Annular slot; 5-Arc guide groove; 6-Sliding block; 7-Self-locking section; 8-Unlocking section ; 9-entrance section; 10-free section; 11-initial section; 12-handle; 13-connecting rod; 14-seat board.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the above description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "one side", "the other side", etc. is based on the orientation or positional relationship shown in the drawings, or when the product of the invention is used. The conventionally placed orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. Limitations of Invention. In addition, the terms "first", "second", etc. are only used to differentiate descriptions and are not to be understood as indicating or implying relative importance.

Furthermore, terms such as the term "identical" do not imply that parts are required to be absolutely identical, but rather that minor differences may exist. The term "vertical" simply means that the positional relationship between components is more vertical than "parallel". It does not mean that the structure must be completely vertical, but can be slightly tilted.

As shown in Figures 1-10, this embodiment provides a self-locking mechanism, which includes a first sleeve 1 and a second sleeve 2. The second sleeve is sleeved outside the first sleeve and can rotate relatively. Especially of:

An annular latching tooth 3 is provided on one end face of the first sleeve. The shape of the latching teeth is not limited and can be square or triangular. The second sleeve is provided with an annular latching tooth 3 on the same side of the annular latching tooth end. The teeth engage with each other in the annular slot 4, so that the two can be engaged and fixed.

The outer wall of the first sleeve is provided with an arc-shaped guide groove 5, and the inner wall of the second sleeve is provided with a slider 6 for sliding in the arc-shaped guide groove. When the slider slides along the arc-shaped guide groove, the first Rotation and axial displacement occur between the sleeve and the second sleeve, and the slider moves one circle along the arc-shaped guide groove, so that the annular teeth and the annular groove are engaged at least once, that is, self-locking is achieved once.

As an improvement of this embodiment, the central angle of the arc-shaped guide groove is 90°, as shown in Figure 4. In this way, the second sleeve can be self-locked once by rotating 90 degrees along the first sleeve.

As an improvement of this embodiment, the arc-shaped guide groove includes a self-locking section 7 that is farthest in the axial direction from the annular teeth. The self-locking section is a straight section with a central angle of 10°±5°. Through the straight line segment of about 10°, a self-locking distance can be maintained between the second sleeve and the first sleeve, thereby preventing loosening or detachment and making the self-locking effect better.

As an improvement of this embodiment, the arc-shaped guide groove also includes an unlocking section 8 connected to the self-locking section. As shown in the figure, the unlocking section is an inclined section, and its span on the circumference is a central angle of 5°±2°. In this way, the unlocking can be completed at a certain distance to prevent loosening or disengagement too quickly.

As an improvement of this embodiment, the arc-shaped guide groove also includes an inlet section 9 that enters the self-locking section. The entrance section has an increasing taper, making it easier to enter.

As an improvement of this embodiment, the arc guide groove also includes a free section 10, which is connected to the unlocking section and the entrance section respectively. This achieves a cycle of freedom, self-locking, unlocking, and freedom.

As an improvement of this embodiment, the arc-shaped guide groove also includes an initial section 11 connected with the inlet section. The initial section is closest to the annular tooth surface and is inclined toward the entrance section. Even if the teeth are slowly approaching the slot.

The self-locking mechanism of this embodiment can be applied to multiple occasions, such as chairs, tables and other various places with folding. The following takes a chair as an example for further explanation:

As shown in Figures 8 and 9, it is a folding chair for the elderly or patients. The folding chair is provided with a handle 12 on each left and right sides, and a connecting rod 13 is provided on the front side between the two handles. On the connecting rod A seat plate 14 is rotatably provided on the seat plate. Two rotating sleeves are provided on the seat plate. A self-locking structure as described above is provided between any rotating sleeve and the connecting rod.

Further, the rotating sleeve is sleeved and fixed on the second sleeve, the second sleeve is rotated and arranged on the connecting rod through the rolling bearing, the first sleeve is sleeved on the connecting rod, and a key or keyway is provided on the first sleeve. A keyway or key is provided on the connecting rod so that the two have horizontal movement freedom but no rotational freedom, thereby achieving relative sliding between the two.

In order to achieve fixation when the seat panel is turned up, in this embodiment, the slide block and the self-locking section are engaged and set at a position of 75°-85° when the seat is folded up, and the unlocking position is 85°-90°. In this way, you can unlock it with just a slight lift, which is very convenient and simple to use.

In short, this embodiment achieves the design goal of completing self-locking and unlocking in one direction within 90°.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified. Modifications or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention shall be included in the scope of the claims of the present invention.

Claims (4)

1. The self-locking mechanism is characterized in that: comprises a first sleeve and a second sleeve sleeved outside the first sleeve, wherein an annular latch is arranged on one end face of the first sleeve, an annular clamping groove which is clamped with the annular latch is arranged on the same side of the annular latch end of the second sleeve,

the novel self-locking device is characterized in that an arc-shaped guide groove is formed in the outer wall of the first sleeve, a sliding block sliding in the arc-shaped guide groove is arranged on the inner wall of the second sleeve, when the sliding block slides along the arc-shaped guide groove, rotation and axial displacement occur between the first sleeve and the second sleeve, at least annular clamping teeth are clamped with the annular clamping groove once, the arc-shaped guide groove comprises a self-locking section farthest from the annular clamping teeth by an axial distance, the self-locking section is a straight line section with a central angle of 10 DEG + -5 DEG, the arc-shaped guide groove further comprises an unlocking section which is connected with the self-locking section and has a central angle of 5 DEG + -2 DEG, the arc-shaped guide groove further comprises an inlet section which enters the self-locking section, the free section is respectively communicated with the unlocking section and the inlet section, and the arc-shaped guide groove further comprises an initial section communicated with the inlet section.

2. The self-locking mechanism of claim 1, wherein: the center angle of the arc-shaped guide groove is 90 degrees.

3. A folding chair, characterized in that: the folding chair is provided with two handles, a connecting rod is arranged between the two handles, a seat is rotatably arranged on the connecting rod, two rotating sleeves are arranged on the seat, and a self-locking mechanism as claimed in any one of claims 1-2 is arranged between any one of the rotating sleeves and the connecting rod.

4. A folding chair as claimed in claim 3, wherein: the rotating sleeve is sleeved and fixed on the second sleeve, the second sleeve is rotatably arranged on the connecting rod, and the first sleeve is sleeved on the connecting rod in a sliding manner.