Transmission part of massage sofa

Abstract

The utility model belongs to the field of home furnishing manufacturing, and particularly discloses a massage sofa transmission piece which comprises a first transmission block and a second transmission block which are arranged in a crossed mode and connected through a fastener, and the fastener comprises a first U-shaped groove and a second U-shaped groove which are formed in the tail end of a screw and symmetrically formed along the axis of the screw. The first U-shaped groove and the second U-shaped groove which are symmetrically formed along the axis of the screw rod are formed in the bottom of the fastener, the cross section shape of the U-shaped grooves is optimized, and meanwhile, the spring cushion 305, the pressure reduction groove, the stress release hole and other structures are additionally arranged, so that the reliability and durability of a transmission piece under a dynamic load are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of home manufacturing, specifically relates to a massage sofa transmission part. BACKGROUND

[0002] With the progress of society and the increase of people's work pressure, people often go to massage to relax when idle, and the family is equipped with massage sofa becomes one of the choices of people's daily massage. The overall structure of the transmission device of the existing massage sofa is complex, and it is troublesome to assemble, which increases the production cost. In order to solve the problems existing in the prior art, people have carried on the long-term exploration, and put forward all sorts of solutions

[0003] The utility model discloses a massage sofa transmission part, including first transmission block and second transmission block, be equipped with first connecting hole in the one end of first transmission block, have the first limit flanging that turns over to the same direction on the both sides of first transmission block, and the first limit flanging one end with first transmission block is away from the one end of first connecting hole flush, and the other end is equipped with first connecting hole with the one end of first transmission block and forms the limit step between, the second transmission block middle part is fixed in the one end of first transmission block through detachable connecting structure, be equipped with second connecting hole in the one end of second transmission block, be equipped with support connecting sleeve in the other end of second transmission block. The utility model has the advantages of more reasonable design, simple structure and low cost.

[0004] However, the fastener is prone to loosening under long-term vibration in actual use, reducing the connection stability, and the metal plate of the first transmission block may be locally deformed due to stress concentration around the threaded hole. UTILITY MODEL CONTENTS

[0005] The utility model discloses a massage sofa transmission part which is improved by setting a first U-shaped groove and a second U-shaped groove symmetrically along the screw rod axis at the bottom of the fastener, optimizing the cross-sectional shape of the U-shaped groove, and additionally setting a spring pad, a pressure relief groove and a stress release hole, thereby significantly improving the reliability and durability of the transmission part under dynamic load.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a massage sofa transmission part, comprising a first transmission block and a second transmission block which are arranged in cross and connected by a fastener, wherein the fastener comprises a first U-shaped groove and a second U-shaped groove which are symmetrically arranged along the screw rod axis at the end of the screw rod.

[0007] Preferably, the cross section of the first U-shaped groove and the second U-shaped groove is rectangular.

[0008] Preferably, the fastener further comprises a spring pad sleeved outside the screw rod, the outer diameter of the spring pad matches the diameter of the head, and the inner diameter of the spring pad is larger than the diameter of the screw rod.

[0009] Preferably, the first U-shaped groove and the second U-shaped groove have a U-shaped cross section, and the groove bottom is a circular arc transition.

[0010] Preferably, the first U-shaped groove and the second U-shaped groove have a trapezoidal cross section formed by gradually expanding the groove width from the root to the opening end.

[0011] Preferably, the first U-shaped groove and the second U-shaped groove are provided with a pressure relief groove on the outer side,

[0012] Preferably, the first U-shaped groove and the second U-shaped groove are provided with a stress release hole penetrating the screw rod at the end, and the center of the stress release hole is located at the center of the circular arc at the end of the U-shaped groove.

[0013] The utility model has the following beneficial effects compared with the prior art: the utility model discloses that the U-shaped groove is symmetrically arranged at the end of the screw rod, the groove wall forms a buckle structure, the risk of loosening under the shearing load is inhibited, stress concentration is reduced, and the anti-deformation capacity is improved, then the spring pad and the circular arc groove bottom are designed to inhibit vibration loosening, finally, the gradually changing groove width and the pressure relief groove are used to evenly change the load stress and prevent fatigue failure, the stress release hole is used to cut off the crack path and optimize the thread stress, and the connection strength and service life are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the axonometric view of the transmission member of the utility model;

[0015] Figure 2 is the schematic view of the fastener of the utility model;

[0016] Figure 3 is the schematic view of one embodiment of the fastener of the utility model;

[0017] Figure 4 is the schematic view of another embodiment of the fastener of the utility model.

[0018] In the drawing: 1, first transmission block;2, second transmission block;3, fastener;301, head;302, screw rod;303, first U-shaped groove;304, second U-shaped groove;305, spring pad;306, stress release hole. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with examples and drawings, and the schematic embodiment of the utility model and its description are only used to explain the utility model, and not as a limitation on the utility model. Example one

[0020] As Figure 1 shown in a massage sofa transmission member, including through the fastener 3 cross arrangement of the first transmission block 1 and the second transmission block 2, the specific structure of the first transmission block 1 and the second transmission block 2 in the application has been disclosed in CN205350256U;

[0021] The fastener 3 adopts one of screw, rivet or welding pin, and in the embodiment, the fastener 3 adopts screw.

[0022] Please refer to the attached Figure 2 , the fastener 3 includes a first U-shaped groove 303 and a second U-shaped groove 304 provided at the end of the screw rod 302 and symmetrically opened along the axis of the screw rod 302.

[0023] Among them, the cross section of the first U-shaped groove 303 and the second U-shaped groove 304 is rectangular.

[0024] In the embodiment, the first transmission block 1 and the second transmission block 2 are fixed by the screw rod 302 of the fastener 3 penetrating the connecting holes of the two; the head 301 of the fastener 3 is integrally formed with the screw rod 302, and the diameter of the head 301 is greater than that of the screw rod 302, so as to ensure that sufficient axial pressure can be applied to the first transmission block 1 and the second transmission block 2 during screwing;

[0025] The first U-shaped groove 303 and the second U-shaped groove 304 are respectively provided at the end of the screw rod 302 and symmetrically distributed, and the included angle between the opening direction of the first U-shaped groove 303 and the second U-shaped groove 304 and the axis direction of the screw rod 302 is 0-90 degrees, and in the embodiment, the opening direction of the first U-shaped groove 303 and the second U-shaped groove 304 is preferably parallel to the axis of the screw rod 302.

[0026] In the embodiment, the cross section of the first U-shaped groove 303 and the second U-shaped groove 304 is rectangular, the groove depth is 1 / 4 to 1 / 3 of the diameter of the screw rod 302, and the groove width is 1 / 5 to 1 / 4 of the diameter of the screw rod 302, thereby forming a buckle; when the fastener 3 is screwed into the first transmission block 1 and the second transmission block 2, that is, the screw rod 302 is screwed in, the buckle is extruded and shrunk, and can easily enter the threaded hole. After complete tightening, the buckle part rebounds, so that the screw rod 302 supports the inner wall of the threaded hole, and generates friction force to prevent loosening caused by long time vibration.

[0027] In another embodiment, please refer to the attached Figure 3 , the fastener 3 further includes a spring pad 305 sleeved outside the screw rod 302, and the cross section of the first U-shaped groove 303 and the second U-shaped groove 304 is U-shaped.

[0028] The spring pad 305 is located between the head 301 of the fastener 3 and the contact surface of the first transmission block 1 or the second transmission block 2, and has an outer diameter matching the diameter of the head 301 and an inner diameter slightly larger than the diameter of the screw rod 302, so as to ensure that the spring pad 305 can be freely compressed and generate an elastic pre-tightening force.

[0029] At this time, the cross-sectional shape of the first U-shaped groove 303 and the second U-shaped groove 304 is adjusted to a standard U shape, and the groove bottom is a circular arc transition; through the elastic deformation compensation of the spring pad 305, the risk of loosening of the fastener 3 caused by vibration or load change can be further reduced, and the circular arc groove bottom design of the U-shaped groove can reduce stress concentration and prolong the service life of the fastener 3.

[0030] In another embodiment, please refer to the accompanying drawings Figure 4 The groove width of the first U-shaped groove 303 and the second U-shaped groove 304 gradually expands from the root to the opening end. Wherein, a pressure relief groove (not shown in the figure) is additionally arranged outside the first U-shaped groove 303 and the second U-shaped groove 304.

[0031] Specifically, the groove width is 1 / 6 to 1 / 5 of the diameter of the screw rod 302 at the root, and expands to 1 / 4 to 1 / 3 of the diameter of the screw rod 302 at the opening end; the gradually changing groove width structure makes the stress distribution of the fastener 3 more uniform when bearing alternating loads, avoiding the problem of excessive local stress caused by sudden change of groove width;

[0032] In addition, the first U-shaped groove 303 and the second U-shaped groove 304 are additionally provided with a pressure relief groove outside, which is a shallow groove extending along the axis direction of the screw rod 302, with a depth of 1 / 3 to 1 / 2 of the depth of the U-shaped groove and a width of 1 / 2 to 2 / 3 of the opening end width of the U-shaped groove; the setting of the pressure relief groove further disperses the stress concentration area of the edge of the U-shaped groove, thereby improving the fatigue resistance of the fastener 3.

[0033] In particular, a stress release hole 306 is added at the end of the first U-shaped groove 303 and the second U-shaped groove 304.

[0034] The stress release hole 306 is a through hole penetrating through the screw rod 302, with a hole diameter of 1 / 8 to 1 / 6 of the diameter of the screw rod 302 and a center located at the center of the end circular arc of the U-shaped groove; the stress release hole 306 functions to eliminate the risk of micro-crack propagation at the end of the U-shaped groove caused by machining or stress, and optimizes the stress distribution path through the circular arc transition of the hole wall; in addition, the stress release hole 306 can also be used as a positioning mark during assembly, facilitating the confirmation of the orientation of the U-shaped groove during installation.

[0035] In the actual assembly process, the operator first cross-stacks the first transmission block 1 and the second transmission block 2, ensures the alignment of the connecting holes of the two, then passes the screw rod 302 of the fastener 3 through the connecting holes, and installs a nut at the end of the screw rod 302 or directly screws into the pre-threaded hole.

[0036] When the spring pad 305 is used, it is necessary to ensure that the spring pad 305 is compressed to 2 / 3 to 3 / 4 of its thickness during the tightening process to provide a stable pre-tightening force.

[0037] For the fastener 3 provided with the stress release hole, the orientation of the U-shaped groove needs to be adjusted during installation, so that the opening direction is perpendicular to the movement direction of the transmission member, so as to maximize the stress release effect.

[0038] In general, the fastener 3 of the present application significantly improves the reliability and durability of the transmission member under dynamic load by optimizing the cross-sectional shape of the U-shaped groove, adding the spring pad 305 and the pressure relief groove, the stress release hole and other structures. In addition, the technical features in different embodiments can be combined according to the actual application requirements, for example, the U-shaped groove with gradually changing groove width and the stress release hole are used at the same time, or the spring pad 305 and the pressure relief groove are combined to meet the performance requirements under different working conditions.

[0039] The above is only the preferred embodiment of the present application, which is only used to illustrate the scheme and effect of the present application and cannot be considered as limiting the implementation scope of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some changes and improvements can be made without departing from the concept of the present application, which should still belong to the patent coverage range of the present application.

Claims

1. A massage sofa transmission member comprising a first transmission block and a second transmission block which are arranged in a cross shape and connected by a fastener, characterized in that: The fastener comprises a first U-shaped groove and a second U-shaped groove symmetrically arranged at the end of the screw along the screw axis.

2. The massage sofa transmission member according to claim 1, characterized in that: The cross section of the first U-shaped groove and the second U-shaped groove is rectangular.

3. The massage sofa transmission member according to claim 1, wherein: The fastener further comprises a spring washer sleeved outside the screw, the outer diameter of the spring washer matches the diameter of the head, and the inner diameter is larger than the diameter of the screw.

4. The massage sofa transmission member according to claim 3, wherein: The cross section of the first U-shaped groove and the second U-shaped groove is U-shaped, and the bottom of the groove is a circular arc transition.

5. The massage sofa transmission according to any one of claims 1 or 3, characterized in that: The width of the first U-shaped groove and the second U-shaped groove gradually expands from the root to the opening end to form a trapezoidal cross section.

6. The massage sofa transmission member according to claim 3, wherein: The outer side of the first U-shaped groove and the second U-shaped groove is provided with a pressure relief groove.

7. The massage sofa transmission member according to claim 6, characterized in that: The end of the first U-shaped groove and the second U-shaped groove is provided with a stress relief hole penetrating through the screw, and the center of which is located at the center of the circular arc at the end of the U-shaped groove.

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