Universal wire locking device capable of carrying out tension test

Abstract

The utility model discloses a universal wire locking device capable of carrying out a tension test, which comprises a wire fixing device and a fastening screw, the wire fixing device is provided with a wire passing hole, the upper end of the wire passing hole is provided with a flexible wire occlusion internal thread, and the flexible wire occlusion internal thread is used for occluding and pressing a flexible wire in the wire passing hole. Lamp connecting inner threads are arranged at the lower end of the wire passing hole and used for being connected with a lamp, a screw hole is formed in the side face of the wire fixing device, and the inner end of the screw hole is communicated with the wire passing hole. And the fastening screw is screwed on the screw hole so as to press the flexible wire. According to the utility model, the wire diameter of 8.0-12mm can be universally used, and the internal thread is designed in the wire passing hole, so that all wire diameters can meet the 156N tension test requirement.

Description

Technical Field

[0001] The utility model belongs to the field of flexible cord installation fittings for lighting fixtures, and particularly relates to a universal cord locking device capable of performing a tensile test. Background Art

[0002] Regarding the installation of flexible cords in American standard lighting fixtures, the following regulations are available: (1) According to Clause 11.2.12 of UL1598_5, when the flexible cord is the only load-bearing component for hanging the lighting fixture, the weight of the lighting fixture should be ≤ 4.5 kg; (2) According to UL1598_516.21.1.1 and UL1598_516.21.1.2, when a tensile force of 156 N (35 lbf) is applied to the flexible cord in the direction perpendicular to the plane of the lighting fixture inlet, the displacement of the flexible cord should not exceed 1.6 mm.

[0003] The current cord locking devices (also known as stress relief devices) used for fixing flexible cords in the market have obvious limitations in use:

[0004] 1. The current cord locking devices in the market only have the basic cord locking function, but do not meet the requirements of withstanding a tensile force of 156 N (about 15.6 kg) for 1 minute and having a cord sheath displacement of less than 1.6 mm.

[0005] 2. The current cord locking devices in the market are all used with cord lockers of different specifications for different wire diameters, and the universality is poor.

[0006] 3. The cord locking device is a plastic injection molded part, which will age over time and pose a safety hazard.

[0007] 4. The injection molded part does not have post-processing performance, and the use requires the lighting fixture to be designed and installed according to its inherent specifications, resulting in inflexible lighting fixture design.

[0008] 5. The maximum wire diameter that can pass through the wire passing hole of the cord locking device is less than 10 mm (for example, the maximum wire passing diameter of the external thread cord buckle of Shanghai Zhaoguan is 8.7 mm, and the maximum wire passing diameter of the internal thread cord buckle is 9.8 mm); while the flexible cords exported to North America are usually SJT / SJTW flexible cords, with a wire diameter of 10.5 mm for 5-core wires and 11.5 mm for 6-core wires, both of which cannot be used. Summary of the Utility Model

[0009] The utility model provides a universal cord locking device capable of performing a tensile test, which has a beautiful appearance and is convenient to install, can meet the universality of wire diameters from 8.0 mm to 12 mm, and the wire passing hole is designed with internal screw threads to ensure that all wire diameters can meet the requirements of a 156 N tensile test.

[0010] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0011] A general-purpose thread-locking device capable of performing tensile tests, comprising a wire fixator and a set screw. A wire passing hole is provided on the wire fixator. A soft wire biting internal thread is provided at the upper end of the wire passing hole. The soft wire biting internal thread is used to bite and compress the soft wire in the wire passing hole. A lamp connection internal thread is provided at the lower end of the wire passing hole. The lamp connection internal thread is used to connect with a lamp. A screw hole is provided on the side surface of the wire fixator. The inner end of the screw hole communicates with the wire passing hole; the set screw is screwed onto the screw hole to compress the soft wire.

[0012] The tooth pitch of the soft wire biting internal thread is greater than 1.75 mm, and the number of tooth turns is greater than 4 turns.

[0013] The set screw includes a screw body made of a metal material, and a nylon head is provided at the front end of the screw body.

[0014] The end face of the nylon head is a flat surface.

[0015] The diameter of the end face of the nylon head is greater than 3 mm.

[0016] The screw hole is opened in the area where the soft wire biting internal thread is distributed.

[0017] The beneficial effects achieved by the present utility model are as follows: The soft wire biting internal thread on the wire fixator of the present utility model bites and compresses the hoisting soft wire of the lamp, and then the set screw on the side further compresses the soft wire, so as to meet the requirements of a tensile force of 156 N for 1 minute and a wire skin displacement of less than 1.6 mm during the tensile test.

[0018] The biting force provided by the soft wire biting internal thread in the present utility model enables soft wires with a wire diameter of 8 - 12 mm to be used and meet the tensile force requirements, achieving true universality.

[0019] In the present utility model, the wire fixator is formed by aluminum die-casting, and the lamp connection internal thread can be arbitrarily processed to meet the connection requirements of different lamps, and thus a variety of lamps can be used in a universal manner. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0021] Figure 1 is the structural explosion diagram of the present utility model;

[0022] Figure 2 is the structural schematic diagram of the wire fixator in the present utility model;

[0023] Figure 3 is the bottom view of the wire fixator in the present utility model;

[0024] Figure 4 Schematic diagram of the set screw in the present utility model;

[0025] Figure 5 Schematic diagram of the state of connection between the present utility model and a flexible wire;

[0026] Figure 6 Schematic diagram of the present utility model connected to a lamp;

[0027] In the figure: 1. Wire fixing device, 2. Set screw, 3. Wire passing hole, 4. Inner thread for biting flexible wire, 5. Inner thread for lamp connection, 6. Screw body, 7. Nylon head, 8. Flexible wire, 9. Lamp. Specific embodiments

[0028] The following describes the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0029] As Figure 1-6 shown, a general-purpose wire locking device capable of performing a tensile test includes a wire fixing device 1 and a set screw 2. The wire fixing device 1 is provided with a wire passing hole 3. A flexible wire 8 used for installing a lamp 9 passes through the wire passing hole 3, and the wire fixing device 1 is fixedly connected to the lamp 9. The set screw 2 is installed on the wire fixing device 1 from the side and passes through the side wall of the wire fixing device 1 to press the flexible wire 8 in the wire passing hole 3.

[0030] Specifically, as Figure 1-3 shown, a vertically penetrating wire passing hole 3 is provided at the center of the wire fixing device 1. An inner thread for biting flexible wire 4 is provided at the upper end of the wire passing hole 3. After the flexible wire 8 passes through the wire passing hole 3, the inner thread for biting flexible wire 4 tightly bites with the wire sheath of the flexible wire 7 to meet the requirements of the tensile test.

[0031] The setting of the inner thread for biting flexible wire 4 can effectively increase the friction coefficient of the inner surface of the wire passing hole 3, thereby increasing the frictional resistance between the wire passing hole 3 and the flexible wire 8, and further meeting the requirements of the 156N tensile test. It should be noted that by designing the pitch and number of turns of the inner thread of the flexible wire, it is possible to avoid damaging the wire sheath of the flexible wire during the 156N tensile test. For example, the pitch of the inner thread for biting flexible wire 4 is greater than 1.75 mm, and the number of turns of the thread is greater than 4 turns. At the same time, the biting force provided by the inner thread for biting flexible wire 4 of this specification enables flexible wires 7 with a wire diameter of 8 - 12 mm to all be used in the 156N tensile test and meet the tensile requirements, achieving true universality.

[0032] An inner thread for lamp connection 5 is further provided at the lower end of the wire passing hole 3 of the wire fixing device 1 for connecting to the lamp 9. The diameter of the inner thread for lamp connection 5 is greater than the wire diameter of the flexible wire 8. The specifications of the inner thread for lamp connection 5 from M8 to M20 can be arbitrarily processed to achieve connection with different lamps 9.

[0033] The side of the wire fixer 1 is provided with screw holes, the inner ends of the screw holes communicate with the wire passing holes 3, and set screws 2 are installed in the screw holes to press the flexible wire 8 from the side.

[0034] Both types of screw threads of the wire fixer 1 are located in the wire passing holes 3. Using a set of molds can solve the processing of all screw threads, reduce a large number of SKUs and save mold costs. The wire fixer 1 adopts ADC12 die-casting process, and the same color as the lamp is achieved through surface spraying process. Most of the suspended lamps belong to decorative lamps and are used in places with strong atmosphere, and have high requirements for the appearance color. Therefore, the metal plus spraying process can achieve color diversity and can achieve colors that many injection-molded parts cannot achieve, such as bronze color, nickel color, etc.

[0035] As Figure 4 shown, the set screw 2 consists of a screw body 6 and a nylon head 7. The nylon head 7 is fixed at the front end of the screw body 6, and a flat groove or a cross groove for facilitating the screwing with a screwdriver is provided at the rear end of the screw body 6. The screw body 6 of the set screw 2 is made of metal materials such as stainless steel, which can prevent the plastic from aging due to long-term use and causing the tensile strength to fail; the head is made of nylon material, which can avoid scratching the wire sheath when pressing against the flexible wire.

[0036] Further, the end face of the nylon head 7 is a plane and the diameter is greater than 3 mm, further ensuring that the flexible wire sheath will not be damaged during the tensile test.

[0037] It should be noted that when the set screw 2 is screwed into the wire fixer 1, different torque controls can be adopted for flexible wires 8 with different wire diameters to achieve the locking strength control, so that flexible wires 8 with different wire diameters can meet the 156 N tensile test during use, achieving the purpose of the wire locking device being universal for different wire diameters.

[0038] Further, the screw holes are opened in the area where the internal female screw teeth 4 for soft wire biting are distributed.

[0039] When using the wire locking device of the present invention for tensile test, the flexible wire 8 for suspending the lamp 9 passes through the wire passing hole 3 of the wire fixer 1. The wire fixer 1 is screwed onto the lamp 9 through the internal female screw teeth 5 for lamp connection. The set screw 2 is screwed into the screw hole on the side of the wire fixer 1 and presses the flexible wire 8. After the wire fixer 1 and the set screw 2 fix the flexible wire 8, as Figure 5 shown. After assembly, as Figure 6 shown, the 156 N tensile test can be carried out as required. The arrow F in the figure indicates the tensile direction during the test.

[0040] It should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The terms used in the description of this application are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0042] It should be noted that in the description of this application, the orientation or positional relationships indicated by the orientation terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing this application and simplifying the description. Without contrary explanations, these orientation terms do not indicate or imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of this application; the orientation terms "inside, outside" refer to the inside and outside relative to the outline of each component itself.

Claims

1. A universal wire locking device capable of performing a tensile test, characterized in that: It includes a wire fixer and a fixing screw. The wire fixer is provided with a wire passing hole. The upper end of the wire passing hole is provided with a soft wire biting inner thread. The soft wire biting inner thread is used to bite and compress the soft wire in the wire passing hole. The lower end of the wire passing hole is provided with a lamp connecting inner thread. The lamp connecting inner thread is used to connect with the lamp. The side of the wire fixer is provided with a screw hole. The inner end of the screw hole is connected with the wire passing hole; the fixing screw is tightened on the screw hole to compress the soft wire.

2. The universal wire locking device according to claim 1, characterized in that: The tooth spacing of the soft wire biting internal screw teeth is greater than 1.75mm, and the number of tooth circles is greater than 4 circles.

3. The universal wire locking device according to claim 1, characterized in that: The set screw comprises a screw body made of metal, and a nylon head is arranged at the front end of the screw body.

4. The universal wire locking device according to claim 3, characterized in that: The end surface of the nylon head is a plane.

5. The universal wire locking device according to claim 4, characterized in that: The diameter of the nylon head end surface is greater than 3 mm.

6. The universal wire locking device according to claim 1, characterized in that: The screw hole is arranged in the area where the inner thread of the flexible wire is engaged.

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