Fastening Assembly, Connecting Strap Assembly, and Wearable Device

Abstract

A fastening assembly comprises: a pressing plate, a base and a rotating shaft; wherein the pressing plate is rotatively connected to the base by the rotating shaft, the pressing plate and the base are enclosed to form a passage to accommodate the first connecting strap; and a press-fit protrusion is provided on the pressing plate to press the first connecting strap in the passage; a first snap-fit part is provided on the pressing plate, and a second snap-fit part is provided on the base, fit into each other to form the snap-fit connection.

Claims

1.-12. (canceled)

13. A watch strap, comprising: a first connecting strap; a second connecting strap; and a fastening assembly coupled to the second connecting strap and comprising: rotating shaft; a base comprising a first surface, wherein the first surface comprises a first snap-fit part, and wherein the first snap-fit is a locking protrusion or a locking groove; and a pressing plate rotatively coupled to the base by the rotating shaft and comprising: a second surface comprising a press-fit protrusion configured to press the first connecting strap in a passage, wherein the pressing plate and the base are enclosed to form the passage; and a third surface comprising a second snap-fit part and facing the first surface of the base, wherein the second snap-fit part is the locking protrusion when the first snap-fit part is the locking groove, wherein the second snap-fit part is the locking groove when the first snap-fit part is the locking protrusion, and wherein the locking protrusion and the locking groove fit into each other to form a snap-fit connection.

14. The watch strap of claim 13, wherein the locking protrusion is an arc-shaped surface, and wherein an orthographic projection of the locking protrusion on a design surface of the locking protrusion is obround.

15. The watch strap of claim 13, wherein either the press-fit protrusion is an arc-shaped surface and a first orthographic projection of the press-fit protrusion on a design surface of the press-fit protrusion is obround, or the press-fit protrusion is an arc-shaped surface and a flat surface and a second orthographic projection of the press-fit protrusion on the design surface is a rounded rectangle, and wherein a third orthographic projection of the flat surface is a shorter straight side of the rounded rectangle.

16. The watch strap of claim 13, wherein the first surface of the base is an outer side of the base.

17. The watch strap of claim 13, further comprising a cover plate coupled to the base and configured to fasten the second connecting strap between the cover plate and the base.

18. The watch strap of claim 13, wherein the pressing plate further comprises a first lateral part, a middle part, and a second lateral part that are sequentially connected, wherein the rotating shaft passes through the first lateral part, the base, and the second lateral part, and wherein both the first lateral part and the second lateral part each are rotatively coupled to the base using the rotating shaft.

19. The watch strap according to of claim 18, further comprising a cover plate located on a side that is of the base and that is away from the middle part.

20. The watch strap of claim 19, wherein the second connecting strap has through holes, wherein the cover plate has connecting holes, and wherein the fastening assembly comprises: a connecting column comprising a screw hole; a screwed fitting passing through the connecting holes, connected to the screw hole, and configured to fasten the second connecting strap between the cover plate and the base; and a locating column located on the side of the base, wherein the connecting column and the locating column pass through the through holes.

21. The watch strap of claim 20, wherein the base further comprises: a base plate comprising an edge and a fourth surface facing the middle part, wherein the press-fit protrusion is provided on the fourth surface; and a lateral plate facing away from the middle part and protruding over the edge, wherein the lateral plate and the base plate are enclosed to form a groove having an opening, wherein both the connecting column and the locating column are provided on a bottom surface of the groove, wherein the opening accommodates one end that is of the second connecting strap and that is provided with the through holes in the groove, wherein the lateral plate and the first lateral part form a rotative connection and the snap-fit connection, and wherein the lateral plate and the second lateral part form the rotative connection and the snap-fit connection.

22. A wearable device, comprising: a first connecting strap comprising a first end; a second connecting strap comprising a second end; a main part coupled to the first end and the second end; and a fastening assembly coupled to the second connecting strap, located away from the main part, and comprising: a rotating shaft; a base comprising a first surface, wherein the first surface comprises a first snap-fit part, and wherein the first snap-fit part is a locking protrusion or a locking groove; and a pressing plate rotatively coupled to the base by the rotating shaft and comprising: a second surface comprising a press-fit protrusion configured to press the first connecting strap in a passage, wherein the pressing plate and the base are enclosed to form the passage; and a third surface comprising a second snap-fit part and facing the first surface of the base, wherein the second snap-fit part is the locking protrusion when the first snap-fit part is the locking groove, wherein the second snap-fit part is the locking groove when the first snap-fit part is the locking protrusion, and wherein the locking protrusion and the locking groove fit into each other to form a snap-fit connection.

23. The wearable device of claim 22, wherein the locking protrusion is an arc-shaped surface, and wherein an orthographic projection of the locking protrusion on a design surface of the locking protrusion is obround.

24. The wearable device of claim 22, wherein either the press-fit protrusion is an arc-shaped surface and a first orthographic projection of the press-fit protrusion on a design surface of the press-fit protrusion is obround, or the press-fit protrusion is an arc-shaped surface and a flat surface and a second orthographic projection of the press-fit protrusion on a design surface of the press-fit protrusion is a rounded rectangle, and wherein a third orthographic projection of the flat surface is a shorter straight side of the rounded rectangle.

25. The wearable device of claim 22, wherein the first surface of the base is an outer side of the base.

26. The wearable device of claim 22, further comprising a cover plate coupled to the base and configured to fasten the second connecting strap between the cover plate and the base.

27. The wearable device of claim 22, wherein the pressing plate further comprises a first lateral part, a middle part, and a second lateral part that are sequentially connected, wherein the rotating shaft passes through the first lateral part, the base, and the second lateral part, and wherein both the first lateral part and the second lateral part each are rotatively coupled to the base using the rotating shaft.

28. The wearable device of claim 27, further comprising a cover plate located on a side that is of the base and that is away from the middle part.

29. The wearable device of claim 28, wherein the second connecting strap has through holes, wherein the cover plate has connecting holes, and wherein the fastening assembly comprises: a connecting column has a screw hole; a screwed fitting passes through the connecting holes and is connected to the screw hole to fasten the second connecting strap between the cover plate and the base; and a locating column located on the side of the base, wherein the connecting column and the locating column pass through the through holes.

30. The wearable device of claim 29, wherein the base further comprises: a base plate comprising an edge and a fourth surface facing the middle part, wherein the press-fit protrusion is provided on the fourth surface; and a lateral plate located away from the middle part and protruding over the edge, wherein the lateral plate and the base plate are enclosed to form a groove having an opening, the press fit protrusion is provided on a surface that is of the base plate and that faces the middle part, wherein both the connecting column and the locating column are provided on a bottom surface of the groove, wherein the opening accommodates one end that is of the second connecting strap and that is provided with the through holes in the groove, wherein the lateral plate and the first lateral part form a rotative connection and the snap-fit connection, and wherein the lateral plate and the second lateral part form the rotative connection and the snap-fit connection.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0028] FIG. 1 shows a structure of a conventional watch strap,

[0029] FIG. 2 is a schematic top view of a structure of a wearable device according to an embodiment;

[0030] FIG. 3 is a schematic three-dimensional diagram of a structure of a first connecting strap of the wearable device in FIG. 2;

[0031] FIG. 4 is a schematic diagram of an assembly structure of a second connecting strap and a fastening assembly of the wearable device in FIG. 2 from an angle of view;

[0032] FIG. 5 is a schematic diagram of a disassembled structure of the assembly structure of the second connecting strap and the fastening assembly in FIG. 4;

[0033] FIG. 6 is a schematic diagram of a disassembled structure of the fastening assembly in FIG. 5;

[0034] FIG. 7 is a schematic diagram of a structure of a pressing plate in the fastening assembly in FIG. 6;

[0035] FIG. 8 is a schematic diagram of a structure of a base in FIG. 6 from an angle of view;

[0036] FIG. 9 is a schematic diagram of a structure of a base in FIG. 6 from another angle of view:

[0037] FIG. 10 is a schematic top view of a structure of the base in FIG. 8;

[0038] FIG. 11 is a schematic diagram of a state in which the pressing plate in FIG. 7 and the base in FIG. 8 are assembled;

[0039] FIG. 12 is a schematic diagram of a structure of a cover plate in the fastening assembly in FIG. 6;

[0040] FIG. 13 is a schematic diagram of a structure of the fastening assembly in FIG. 5 from an angle of view;

[0041] FIG. 14 is a schematic diagram of an assembly structure of the second connecting strap and the fastening assembly in FIG. 4 from another angle of view;

[0042] FIG. 15 is a schematic diagram of a state in which a pressing plate rotates around a fastening assembly by a specific angle for a first connecting strap to pass through the fastening assembly according to an embodiment;

[0043] FIG. 16 is a schematic diagram of a state in which a first connecting strap passes through a fastening assembly according to an embodiment; and

[0044] FIG. 17 is a schematic diagram of a state in which a pressing plate and a base form a snap-fit connection to tighten a first connecting strap between the pressing plate and the base according to an embodiment.

DESCRIPTION OF EMBODIMENTS

[0045] The following embodiments of this application provide a wearable device, including but not limited to a smart watch, a smart band, and an electronic sphygmomanometer. A position at which the wearable device is worn on a human includes but is not limited to a wrist and an arm. The wearable device in the following embodiments may be a smart watch, and may be worn on a wrist.

[0046] As shown in FIG. 2, a wearable device 10 according to an embodiment may include a main part 14 and a connecting strap assembly 100. The connecting strap assembly 100 may include a first connecting strap 11, a second connecting strap 12, and a fastening assembly 13.

[0047] The main part 14 is a main functional part of the wearable device 10 and may include a housing and several components mounted in the housing (or on the housing). The several components may include a display, an electronic device, a circuit board component, and a structural member. The display may be electrically connected to the circuit board component for display (and may further implement a touch control function). The electronic device may be electrically connected to the circuit board component to implement a corresponding function. The structural member may have functions such as bearing, locating, structure strengthening, and receiving a pressing or rotation operation of a user (for example, the structural member may be a crown). When the wearable device 10 is a smart watch, the main part 14 may be referred to as a watch head.

[0048] In the connecting strap assembly 100, the first connecting strap 11 and the second connecting strap 12 are respectively connected to two opposite ends of the main part 14, and a length of the first connecting strap 11 may be greater than a length of the second connecting strap 12. The fastening assembly 13 is fastened to one end that is of the second connecting strap 12 and that is away from the main part 14. Two opposite ends of the first connecting strap 11 may be respectively referred to as a free end 11 and a connection end 112. The connection end 112 is connected to the main part 14 and may rotate relative to the main part 14. The free end 111 is used to pass through the fastening assembly 13, so that the first connecting strap 11 and the second connecting strap 12 are closed in a circle. After the free end Ill passes through a specific distance, the first connecting strap 11 may be tightened by using the fastening assembly 13. This enables the first connecting strap 11 and the second connecting strap 12 to be fastened, and the connecting strap assembly 100 to reliably surround a wrist of a user.

[0049] FIG. 3 may represent a structure of the first connecting strap 11 in a flattened state. As shown in FIG. 3, the first connecting strap 11 may be roughly rectangular and strip-shaped (or plate-shaped), and a rotating shaft may be provided at the connection end 112 to be rotatively connected to the main part 14. No through hole (a through hole of which an axis is in a thickness direction of the first connecting strap 11) is provided in the first connecting strap 11, showing a complete and whole look.

[0050] The first connecting strap 11 is soft and easily deformed, for example, may be a woven nylon strap or a woven polyester strap: may be a soft rubber strap, for example, a soft rubber strap made of fluoro rubber, silica gel, or thermoplastic polyurethanes (Thermoplastic polyurethanes, TPU); or may be a leather strap.

[0051] FIG. 4 and FIG. 5 may represent an assembly structure of the fastening assembly 13 and the second connecting strap 12, and the second connecting strap 12 is in a flattened state.

[0052] As shown in FIG. 4 and FIG. 5, the second connecting strap 12 may be roughly rectangular and strip-shaped (or plate-shaped). Two opposite ends of the second connecting strap 12 may be respectively referred to as a matching end 121 and a connection end 122. The matching end 121 is provided with several through holes (an axis of the through holes is in a thickness dimension of the second connecting strap 12). For example, two through holes 121a and two through holes 121b are provided. The two through holes 121b may be schematically located between the two through holes 121a, and a diameter of the through holes 121a may be greater than a diameter of the through holes 121b. The through holes 121a and the through holes 121b are used to fit into the fastening assembly 13 (further described below). A structure and a quantity of through holes at the matching end 121 may be designed based on an actual requirement, and the foregoing description is merely an example. The connection end 122 is used to be connected to the main part 14, and a rotating shaft may be provided at the connection end 122, to be rotatively connected to the main part 14.

[0053] With reference to FIG. 5 and FIG. 4, the matching end 121 is connected to the fastening assembly 13, and the through holes provided at the matching end 121 are blocked by the fastening assembly 13. A remaining part, other than the matching end 121, of the second connecting strap 12 is an exterior part that can be directly seen by a user, and no through hole is provided on the exterior part. Therefore, the exterior part shows a complete and whole look.

[0054] The second connecting strap 12 is soft and easily deformed, for example, may be a woven nylon strap or a woven polyester strap; may be a soft rubber strap, for example, a soft rubber strap made of fluoro rubber, silica gel, or thermoplastic polyurethanes; or may be a leather strap. The second connecting strap 12 and the first connecting strap 11 may be made of a same material or different materials.

[0055] As shown in FIG. 4 and FIG. 5, the fastening assembly 13 is fastened to the matching end 121 of the second connecting strap 12, and the fastening assembly 13 fits into the through holes in the matching end 121 (further described below).

[0056] FIG. 6 is a schematic diagram of a disassembled structure of the fastening assembly 13. As shown in FIG. 6, the fastening assembly 13 may include a pressing plate 131, a base 132, a cover plate 133, a screw 134, and a rotating shaft 135. Each of the parts is described below.

[0057] As shown in FIG. 7, the pressing plate 131 may be approximately a C-shaped platy structure. The pressing plate 131 may include a middle part 131b, and a first lateral part 131a and a second lateral part 131c that are connected to two opposite ends of the middle part 131b. The middle part 131b may be approximately rectangular and flat. Both an outer surface of the first lateral part 131a and an outer surface of the second lateral part 131c may be approximately arc-shaped (for example, an arc, an elliptic arc, or another curve arc), and both an inner surface of the first lateral part 131a and an inner surface of the second lateral part 131c may be flat surfaces. The first lateral part 131a and the second lateral part 131c are bent towards a same side (for example, a lower side in FIG. 7) in a thickness direction of the middle part 131b. Both the first lateral part 131a and the second lateral part 131c may be in smooth transition to the middle part 131b.

[0058] In this embodiment, that the first lateral part 131a and the second lateral part 131c are bent may be described as that both are bent relative to the middle part 131b. In another embodiment, at least one of the first lateral part 131a and the second lateral part 131c may be roughly a flat structure, and there is an included angle between the flat structure and the middle part 131b. This case is also described as that the first lateral part 131a and the second lateral part 131c are bent relative to the middle part 131b.

[0059] As shown in FIG. 7, a locking groove 131e may be provided on one side of an inner surface 131f of the first lateral part 131a. An inner surface of the locking groove 131e may be an arc-shaped surface (the arc-shaped surface in this embodiment complies with the following definition), and the arc-shaped surface may be a part of a surface of a sphere, an ellipsoid, or a cylinder, or another mathematical surface (for example, a hyperboloid or a hyperbolic paraboloid). An orthographic projection of the locking groove 131e on the inner surface 131f (the inner surface 131f may also be referred to as a design surface of the locking groove 131e, that is, a surface on which the locking groove 131e is designed) may be obround (the obround shape in this embodiment complies with the following definition), and the obround shape may also be referred to as a racetrack shape that is formed with two straight lines and two arcs, where the two straight lines are parallel and equal in length, each of the arcs is tangent to the two straight lines, and the two arcs may have roughly the same shape. That the two straight lines are parallel and equal in length allows an error, that is, there may be an error within a tolerance range of a depth of parallelism or a length of the two straight lines. Each of the arcs may mean an arc, an elliptic arc, or another mathematical curve (for example, a logarithmic curve, a sinusoid, or an involute). A locking groove may also be provided on the inner surface (spaced from and opposite the inner surface 131f) of the second lateral part 131c, and a structure of the locking groove may be roughly the same as that of the locking groove 131e.

[0060] When the pressing plate 131 is assembled with the base 132, the inner surface 131f of the first lateral part 131a faces the base, and the locking groove 131e fits into a locking protrusion on the base 132 (further described below). Similarly, the inner surface of the second lateral part 131c also faces the base, and the locking groove on the inner surface also fits into a locking protrusion on the base 132 (further described below).

[0061] As shown in FIG. 7, a through hole 131d may be provided on the first lateral part 131a, and the through hole 131d may be spaced from the locking groove 131e, where the through hole 131d and the locking groove 131e may be respectively on two sides of the first lateral part 131a. A through hole 131d may also be provided on the second lateral part 131c, and the through hole 131d on the second lateral part 131c may be spaced from the locking groove on the second lateral part 131c, where the through hole 131d and the locking groove may be respectively on two sides of the second lateral part 131c. The through hole 131d is configured to fit into the rotating shaft 135. For example, the first lateral part 131a and the structures on the first lateral part 131a, and the second lateral part 131c and the structures on the second lateral part 131c may be symmetrically distributed on two sides of the middle part 131b.

[0062] As shown in FIG. 8 and FIG. 9, the base 132 may include a first lateral plate 132a, a second lateral plate 132k, a third lateral plate 132d, and a base plate 132b. The base plate 132b may be approximately rectangular and flat. The first lateral plate 132a, the second lateral plate 132k, and the third lateral plate 132d are sequentially connected, and the three plates are respectively connected to three sides of the base plate 132b. The first lateral plate 132a, the second lateral plate 132k, and the third lateral plate 132d are all perpendicular to a same larger surface of the base plate 132b (the larger surface is a surface, in which a normal is located, along a thickness direction of the base plate 132b). The first lateral plate 132a and the third lateral plate 132d may have a smaller thickness, and the second lateral plate 132k may have a larger thickness.

[0063] In this embodiment, a structure formed by enclosing the first lateral plate 132a, the second lateral plate 132k, and the third lateral plate 132d may be referred to as a lateral plate. The lateral plate is located at an edge of the base plate 132b. As shown in FIG. 9, the lateral plate extends only along a part of the edge of the base plate 132b, and does not form an enclosed shape. Therefore, the lateral plate and the base plate 132b may be enclosed to form a groove 132g having an opening.

[0064] As shown in FIG. 8, several press-fit protrusions 132c are provided on a larger surface d that is of the base plate 132b and that is away from the groove 132g. A quantity of press-fit protrusions 132c may be designed based on a requirement, for example, may be 5. A manner of arranging the press-fit protrusions 132c may be designed based on a requirement, for example, may be divided into two columns, where one press-fit protrusion 132c in one column is between two adjacent press-fit protrusions 132c in the other column. The foregoing arrangement manner has a regularity. Clearly, the press-fit protrusions 132c may alternatively be arranged irregularly.

[0065] As shown in FIG. 8 and FIG. 10, the press-fit protrusions 132c may be approximately semi-cylinders, and heights of the semi-cylinders are greater than a diameter of bottom surface. Most surfaces of the press-fit protrusions 132c may be arc-shaped surfaces, and there may be a small flat surface p at each end of each press-fit protrusion 132c in a height direction. The foregoing is merely an example. Actually, the flat surface p may be replaced with an arc-shaped surface based on a product requirement. As shown in FIG. 10, an orthographic projection of each press-fit protrusion 132c on the larger surface d (the larger surface d may also be referred to as a design surface of the press-fit protrusion 132c, that is, a surface on which the press-fit protrusion 132c is designed) of the base plate 132b may be approximately a rounded rectangle, where an orthographic projection of the flat surface p is a shorter straight side of the rounded rectangle. Alternatively, when the flat surface p is replaced with an arc-shaped surface, the orthographic projection of the press-fit protrusion 132c on the larger surface d of the base plate 132b may be approximately obround.

[0066] As shown in FIG. 9, a connecting column 132h and a locating column 132i are provided on a surface that is of the base plate 132b and that is away from the press-fit protrusions 132c, or the connecting column 132h and the locating column 132i are provided on a bottom surface of the groove 132g. Quantities of connecting columns 132h and locating columns 132i may each be designed based on a requirement, for example, may each be two. A manner of arranging the connecting columns 132h and the locating columns 132i may be designed based on a requirement. For example, the locating columns 132i may be between the connecting columns 132h.

[0067] The connecting columns 132h are screwed columns, and screw holes 132j may be provided inside the connecting columns 132h. An axis of each screw hole 132j roughly coincides with an axis of each connecting column 132h. A height of each connecting column 132h and a height of each locating column 132i may both be less than a height of the lateral plate (formed by the first lateral plate 132a, the second lateral plate 132k, and the third lateral plate 132d), that is, a top surface of the connecting column 132h and a top surface of the locating column 132i may both be lower than a top surface of the lateral plate, so that the second connecting strap 12 and the cover plate 133 may be subsequently mounted into the groove 132g (further described below) conveniently. With reference to FIG. 9 and FIG. 5, when the second connecting strap 12 is mounted into the groove 132g, the connecting columns 132h fit into the through holes 121a in the second connecting strap 12, and the locating columns 132i fit into the through holes 121b in the second connecting strap 12.

[0068] As shown in FIG. 8 to FIG. 10, a locking protrusion 132f is provided on a surface that is of the third lateral plate 132d and that is away from the groove 132g, a locking protrusion 132m is provided on a surface that is of the first lateral plate 132a and that is away from the groove 132g, and both the locking protrusion 132f and the locking protrusion 132m are close to the opening of the groove 132g (that is, close to a side, of the base plate 132b, on which no lateral plate is provided). The locking protrusion 132f and the locking protrusion 132m may have a same structure. The locking protrusion 132f is used as an example for description.

[0069] As shown in FIG. 8, a surface of the locking protrusion 132f may be an arc-shaped surface. An orthographic projection of the locking protrusion 132f on the surface (that may also be referred to as a design surface of the locking protrusion 132f, that is, a surface on which the locking protrusion 132f is designed) that is of the third lateral plate 132d and that is away from the groove 132g may be obround. With reference to FIG. 7 and FIG. 8, when the base 132 is assembled with the pressing plate 131, the surface of the third lateral plate 132d faces the inner surface 131f of the first lateral part 131a of the pressing plate 131, and the locking protrusion 132f fits into the locking groove 131e on the inner surface 131f (further described below). With reference to FIG. 10 and FIG. 7, when the base 132 is assembled with the pressing plate 131, the locking protrusion 132m on the first lateral plate 132a fits into the locking groove on the inner surface of the first lateral part 131a of the pressing plate 131 (further described below).

[0070] In this embodiment, the locking protrusion may snap into the locking groove to form a detachable snap-fit connection. The design of a straight side in the obround shape of the locking protrusion helps to increase an area for fastening and ensure the connection strength. The design of an arc-shaped side in the obround shape helps to ensure moderate resistance for fastening or separation, so that travel of the locking protrusion snapping into the locking groove or travel of the locking protrusion separating from the locking groove is smooth.

[0071] In another embodiment, locations at which the locking protrusion and the locking groove are designed may be interchanged, that is, the locking protrusion may alternatively be provided on the inner surface 131f of the first lateral part 131a of the pressing plate 131. Correspondingly, the locking groove may alternatively be provided on the surface that is of the third lateral plate 132d of the base 132 and that is away from the groove 132g. Therefore, in embodiments of this application, one of the locking protrusion and the locking groove may be referred to as a first snap-fit part, and the other may be referred to as a second snap-fit part (the first snap-fit part is the locking protrusion, or the locking groove, and the second snap-fit part is the locking groove, or the locking protrusion). It may be considered that the first snap-fit part is provided on the base 132, and the second snap-fit part is provided on the pressing plate 131.

[0072] As shown in FIG. 8 and FIG. 9, a through hole 132e is provided on the base 132, and the through hole 132e passes through the first lateral plate 132a, the second lateral plate 132k, and the third lateral plate 132d. The through hole 132e is away from the opening of the groove 132g, and the locking protrusion 132f is close to the opening of the groove 132g. The through hole 132e may be aligned with the through hole 131d on the pressing plate 131, and the through hole 132e is configured to mount the rotating shaft 135.

[0073] FIG. 11 shows an assembly structure of the pressing plate 131, the base 132, and the rotating shaft 135. With reference to FIG. 7, FIG. 8, and FIG. 11, the pressing plate 131 may surround the base 131, the first lateral part 131a of the pressing plate 131 is on an outer side of the third lateral plate 132d of the base 132, the second lateral part 131c of the pressing plate 131 is on an outer side of the first lateral plate 132a of the base 132, and the middle part 131b of the pressing plate 131 may be corresponding to the base plate 132b of the base 132. The rotating shaft 135 may pass through the through hole 131d on the first lateral part 131a, the through hole 132e on the base 132, and the through hole 131d on the second lateral part 131c, so that the pressing plate 131 is rotatively connected to the base 132.

[0074] FIG. 11 represents a state of the pressing plate 131 after rotating relative to the base 132 by a specific angle. With reference to FIG. 7 and FIG. 11, the locking groove 131g on the second lateral part 131c of the pressing plate 131 is separated from the locking protrusion on the first lateral plate 132a of the base 132; and the locking groove 131e on the first lateral part 131a of the pressing plate 131 is separated from the locking protrusion 132f on the third lateral plate 132d of the base 132. In this case, the free end 111 of the first connecting strap 11 may be inserted between the middle part 131b of the pressing plate 131 and the base plate 132b of the base 132 from one side of the rotating shaft 135 (further described below).

[0075] When the pressing plate 131 is pressed, the locking groove 131g on the second lateral part 131c of the pressing plate 131 can form a snap-fit connection to the locking protrusion on the first lateral plate 132a of the base 132; and the locking groove 131e on the first lateral part 131a of the pressing plate 131 forms a snap-fit connection to the locking protrusion 132f on the third lateral plate 132d of the base 132. In this case, the middle part 131b of the pressing plate 131 may be spaced from and opposite the base plate 132b of the base 132, and the pressing plate 131 and the base 132 may form a passage. The first connecting strap 11 in the passage is to be pressed tightly by the pressing plate 131 on the press-fit protrusion 132c on the base 132. Therefore, the first connecting strap 11 can be reliably fastened to the fastening assembly 13.

[0076] According to the assembly principle described above, in another embodiment, the press-fit protrusion may alternatively be provided on an inner surface of the middle part 131b of the pressing plate 131, and the base plate 132b of the base 132 may not be provided with a press-fit protrusion; or press-fit protrusions may be provided on both the inner surface of the middle part 131b and the base plate 132b. Both designs can achieve the purpose of tightening the first connecting strap 11 between the pressing plate 131 and the base 132. In the another embodiment, a structure of the press-fit protrusion may be the same as the structure described above.

[0077] FIG. 12 represents a structure of the cover plate 133. As shown in FIG. 12, the cover plate 133 is roughly flat and may be provided with several connecting holes 133a, for example, two connecting holes 133a.

[0078] FIG. 13 represents a structure of the fastening assembly 13 from another angle of view, and may also show a fit of the cover plate 133 into the base 132. As shown in FIG. 13, the cover plate 133 may cover the groove 132g on the base 132, and both the connecting columns 132h and the locating columns 132i in the groove 132g are below the cover plate 133 (the angle of view in FIG. 13 is used as an example). With reference to FIG. 12, FIG. 9, and FIG. 13, the connecting holes 133a on the cover plate 133 may be aligned with the screw holes 132j in the connecting columns 132h on the base 132. Screws 134 may fit into the connecting holes 133a and the screw holes 132j, to fasten the cover plate 133 to the base 132.

[0079] FIG. 14 represents an assembly structure of the second connecting strap 12 and the fastening assembly 13. With reference to FIG. 5, FIG. 13, and FIG. 14, during assembly, the matching end 121 of the second connecting strap 12 may be first placed into the groove 132g on the base 132, the connecting columns 132h in the groove 132g then pass through the through holes 121a at the matching end 121, and the locating columns 132i in the groove 132g pass through the through holes 121b at the matching end 121, to position the matching end in the groove 132g. Then, the cover plate 133 is used to cover the groove 132g, and the cover plate 133 is connected to the connecting columns 132h by using the screws 134, to fasten the cover plate 133 to the base 132, thereby fastening the matching end 121 of the second connecting strap 12 to the fastening assembly 13.

[0080] In the embodiments, the locating columns 132i are designed to position and limit the matching end 121 of the second connecting strap 12. In another embodiment, the locating columns 132i may not be provided based on a product requirement.

[0081] In the embodiments, the second connecting strap 12 is fastened to the fastening assembly 13 by fitting the connecting columns 132h to the screws 134 and the cover plate 133. This design easily ensures that the second connecting strap 12 is detachable, and a user can replace/maintain the fastening assembly 13 or the second connecting strap 12 conveniently. In addition, the screws 134 fit into the connecting columns 132h, but do not fit into the matching end 121 of the second connecting strap 12. This can avoid abrasion caused to the matching end 121 when the screws 134 are mounted or removed, to help ensure a service life of the second connecting strap 12. In another embodiment, based on a product requirement, another structure may alternatively be used to implement a fixed connection between the second connecting strap 12 and the fastening assembly 13. For example, other connecting pieces may be used to replace the screws 134, or the cover plate 133 is fastened to the groove 132g by using another connection structure (for example, a snap-fit structure) instead of a connecting piece. In another embodiment, the second connecting strap 12 and the fastening assembly 13 may form a detachable connection or a non-detachable connection.

[0082] When the pressing plate 131 of the fastening assembly 13 rotates to be in a state shown in FIG. 15, the free end 111 of the first connecting strap 11 may pass through between the pressing plate 131 and the base 132, to close the first connecting strap 11 and the second connecting strap 12, as shown in FIG. 16. After the free end 111 passes through a specific distance, the pressing plate 131 may be pressed for rotation, so that the locking protrusions on the pressing plate 131 engage with the locking grooves on the base 132. In this case, the pressing plate 131 may press the first connecting strap 11 tightly on the press-fit protrusions 132c on the base 132. Held in between the pressing plate 131 and the press-fit protrusions 132c, the first connecting strap 11 can be reliably fastened to the fastening assembly 13, as shown in FIG. 17.

[0083] Refer to FIG. 17 and FIG. 16. When the first connecting strap 11 needs to be removed from the fastening assembly 13, the free end 111 may be lifted up to lift the pressing plate 131 (for example, to rotate the pressing plate 131 counter-clockwise from an angle of view shown in FIG. 17), to unfasten the pressing plate 131 from the base 132. In this case, the first connecting strap 11 is no longer held in between the pressing plate 131 and the press-fit protrusions 132c, and the first connecting strap 11 may be pulled out between the pressing plate 131 and the base 132.

[0084] As shown in FIG. 16, in this embodiment, the rotating shaft 135 is mounted on a side that is of the fastening assembly 13 and that is away from the free end 111. An advantage of this design is that after the free end 111 passes through a specific distance, a user may press the pressing plate 131 (for example, rotate the pressing plate 131 clockwise from an angle of view shown in FIG. 16) smoothly to fasten the first connecting strap 11; and when the first connecting strap 11 needs to be loosened, the user may conveniently lift up the free end 111 to lift the pressing plate 131. With the foregoing design of a location of the rotating shaft 135, an operation of pressing down the pressing plate 131 and lifting the pressing plate 131 can conform to a user habit, and especially, the user can conveniently press down the pressing plate 131 and lift the pressing plate 131 with one hand. It can be understood that, based on a requirement, locations of the rotating shaft 135 and the locking protrusions/locking grooves on the fastening assembly 13 may be interchanged.

[0085] Based on the foregoing descriptions, it can be easily understood that a design for fitting the first connecting strap 11 into the fastening assembly 13 is applicable to a size of a wrist circumference of any user. For users with different sizes of wrist circumferences, only a distance through which the free end 111 passes needs to be adjusted, so that a circumference diameter (that is, a watch strap length) of the first connecting strap 11 and the second connecting strap 12 can suit a wrist circumference of a user. In addition, this design can implement continuous adjustment and fine adjustment of a length of a watch strap, unlike a conventional design in which merely discontinuous adjustment and rough adjustment can be achieved. In addition, in the solution of this embodiment, a hole does not need to be punched up on an exterior part of the first connecting strap 11 and the second connecting strap 12, so that not only structural strength can be ensured, but also wholeness of the exterior can be improved.

[0086] In conclusion, in the solution of this embodiment, the fastening assembly 13 is designed to achieve continuous and fine adjustment of a circumference diameter of the connecting straps reliably and conveniently, ensure structural strength of the connecting straps, and improve wholeness of an exterior of the connecting straps.

[0087] Different from the foregoing embodiment, in another embodiment, the connecting strap assembly of the wearable device may not include the second connecting strap, and the fastening assembly in the connecting strap assembly may be directly connected to the main part of the wearable device. The first connecting strap in the connecting strap assembly may enter a passage of the fastening assembly, and is tightened in the passage. A part of the first connecting strap that is shown outside the passage may curl up to fit the human body. According to the solution in the another embodiment, continuous and fine adjustment of the circumference diameter of the connecting straps can also be reliably and conveniently achieved, structural strength of the connecting straps can be ensured, and wholeness of an exterior of the connecting straps can be improved. In addition, because the second connecting strap is omitted, a structure is simpler, and costs can be reduced.

[0088] The foregoing descriptions are merely specific implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.