CN211858906U - Terminal screw for annular terminal - Google Patents
Terminal screw for annular terminal Download PDFInfo
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- CN211858906U CN211858906U CN202020527105.3U CN202020527105U CN211858906U CN 211858906 U CN211858906 U CN 211858906U CN 202020527105 U CN202020527105 U CN 202020527105U CN 211858906 U CN211858906 U CN 211858906U
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- screw
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- shank
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Abstract
A terminal screw for a ring terminal, the terminal screw comprising a screw head and a screw shank; an outer surface of the screw head includes a first thread; the outer surface of the screw shank comprises a shank thread; wherein the outer surface of the screw head further comprises a guided polish rod portion without threads thereon; the guided polish rod portion is capable of mating with a cover plate threaded bore forming a shaft bore of a cover plate that is threadably engaged with the first thread such that the terminal screw retains only translational freedom along its longitudinal axis and rotational freedom about its longitudinal axis in the loosened position.
Description
Technical Field
The present disclosure relates to a terminal screw for a ring terminal.
Background
A series of annular wiring terminal products are horizontal installation small contactors specially developed for railway customers, and have the advantages of small size, flexible installation and the like. However, for design reasons, the terminal screws have quality problems of poor stability: the original design considers the integration of the protective terminal screw and the pressing plate, ensures that no internal stress of the terminal screw at the loosening position abrades the thread, and sacrifices the stability, but the high risk caused by the abrasion easily causes the deviation of a user when the terminal screw is locked, and even damages a wiring port.
The existing product design considers the integration of a protection screw and a pressure plate, ensures that no internal stress of the screw at a loosening position abrades threads, but sacrifices the stability. The screw has no mechanical connection with the mating piece at the loosening position and has no limit loss. Therefore, when the screw is locked, the offset is easy to occur, the static contact support is damaged, and the screw slides out of the teeth, so that the locking capability is lost.
The contemporary improvement scheme presents installation risks: when the screw is in the release position, the screw thread matching with the plastic cover plate improves the stability of the screw, but at the same time, internal stress can be transmitted to the pressure plate and the screw lower thread, so that the screw lower thread is damaged. Such installation risks increase significantly when the customer applies the electric screwdriver.
The existing products are also provided with a guiding and positioning type screw, the guiding of the screw is positioned at the root of the lower thread, the guiding action only occurs after the root of the screw enters the threaded hole at the lower part, the requirement cannot be met aiming at the application environment needing larger wiring space (the root of the screw and a counterpart), and the conical guiding still has larger risk of damaging a port under the conditions of larger torque and higher rotating speed of the electric screwdriver.
SUMMERY OF THE UTILITY MODEL
To address one or more of the above-mentioned deficiencies in the prior art, the novel terminal screw according to the present disclosure adds a guide feature below the thread of the screw head as compared to prior art screws. When the head thread is unscrewed, the guide feature continues to cooperate with the internal thread, which gives the screw rotational and translational degrees of freedom but limits the remaining degrees of freedom, so that the screw can be guaranteed to rotate coaxially with the terminal without deviation when screwed, and no internal stress is guaranteed to damage the lower thread at the release position.
According to one aspect of the present disclosure, a terminal screw for a ring terminal is provided, the terminal screw including a screw head and a screw shank.
The outer surface of the screw head includes a first thread.
The outer surface of the screw shank includes a shank thread.
The outer surface of the screw head also includes a guided shank portion without threads thereon.
According to the above aspect of the present disclosure, the guided polish rod portion is capable of engaging with the axial bore formed by the cover plate threaded hole of the cover plate that is in threaded engagement with the first thread, such that the terminal screw retains only translational freedom along its longitudinal axis and rotational freedom about its longitudinal axis in the loosened position.
According to the above aspects of the present disclosure, the guided rod portion is located between the first thread and the screw shank portion.
According to the above aspects of the present disclosure, the outer surface of the screw shank further comprises a shank groove.
A pressure plate can fit in the rod portion groove.
According to the above aspects of the present disclosure, the guided polish rod portion is located between the first thread and the rod groove.
According to the above aspects of the present disclosure, the outer diameter of the screw head is larger than the outer diameter of the screw shank.
According to the above aspects of the present disclosure, the guided rod portion has an outer diameter equal to a diameter of a cylindrical surface coinciding with a root of the first thread.
According to the above aspects of the present disclosure, the guided polish rod portion can contact the pressing plate in the locked position, thereby ensuring that the pressing plate provides sufficient pressing force to the ring terminal.
Based on the above aspect of the disclosure, the cover plate threaded hole of the cover plate and the guide polished rod part form a shaft hole matching, but are not in threaded connection, so that the terminal screw can maintain the freedom of translation along the Z direction (along the longitudinal axis direction) and rotation around the Z direction (around the longitudinal axis direction). Compared with the existing product, the terminal screw has limitation on translation and rotation in the X, Y direction (namely, perpendicular to the Z direction), and the damage risk of the terminal and the port caused by translocation of the screw can be effectively reduced. The rotation reserved in the Z direction can enable the screw to rotate freely at the loosening position, and the situation that the assembly of the terminal screw and the pressing plate generates internal stress to damage each thread is avoided.
So that the manner in which the disclosure is made in detail herein can be better understood, and in which the contributions to the art may be better appreciated, the disclosure has been summarized rather broadly. There are, of course, embodiments of the disclosure that will be described below and which will form the subject matter of the claims appended hereto.
As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present disclosure. It is important, therefore, that the appended claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present disclosure.
Drawings
The present disclosure will be better understood and its advantages will become more apparent to those skilled in the art from the following drawings. The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations and are not intended to limit the scope of the present disclosure.
Fig. 1 shows a perspective view of a terminal screw according to a first embodiment of the present disclosure;
fig. 2 shows an assembly view of a terminal screw and a pressure plate according to a first embodiment of the present disclosure;
fig. 3 shows the terminal screw according to the first embodiment of the present disclosure mated with the shaft hole formed by the cover plate screw hole of the cover plate.
Detailed Description
Specific embodiments according to the present disclosure are described in detail below with reference to fig. 1 to 3.
As shown in fig. 1, a terminal screw 1 for a ring terminal is provided, the terminal screw 1 including a screw head 2 and a screw shaft portion 3.
The outer surface of the screw head 2 comprises a first thread 2-1.
The outer surface of the screw shank 3 includes a shank thread 3-1.
The outer surface of the screw head 2 also includes a guided rod portion 2-2, with no threads on the guided rod portion 2-2.
According to the above-mentioned embodiment of the present disclosure, the guided polish rod portion can form a shaft-hole fit with the cover plate threaded hole 4-1 of the cover plate 4 that is in threaded fit with the first thread 2-1, so that the terminal screw 1 in the release position (as shown in fig. 3) only retains the translational freedom along its longitudinal axis and the rotational freedom around its longitudinal axis.
According to the above-described embodiment of the present disclosure, the guided polish rod portion 2-2 is located between the first thread 2-1 and the screw shank 3.
According to the above-described embodiments of the present disclosure, the outer surface of the screw shank 3 further includes a shank groove 3-2.
A pressure plate 5 (shown in fig. 2) can be fitted in the rod part groove 3-2.
According to the above-described embodiment of the present disclosure, the guided polish rod portion 2-2 is located between the first thread 2-1 and the rod groove 3-2.
According to the above-described embodiments of the present disclosure, the outer diameter of the screw head 2 is larger than the outer diameter of the screw shank 3.
According to the above embodiment of the present disclosure, the outside diameter of the guided polish rod portion 2-2 is equal to the diameter of the cylindrical surface coinciding with the root of the first thread 2-1.
According to the above-described embodiment of the present disclosure, the guided polish rod portion 2-2 can contact the pressure plate 5 in the locked position, thereby ensuring that the pressure plate 5 provides sufficient pressing force against the ring terminal (not shown).
According to the above-mentioned embodiment of the present disclosure, the cover plate threaded hole 4-1 of the cover plate 4 and the guide polished rod portion 2-2 form a shaft hole fit, but are not in threaded connection, so that the terminal screw 1 retains the freedom of translation along the Z direction (along the longitudinal axis direction thereof) and rotation around the Z direction (around the longitudinal axis direction thereof). Compared with the existing product, the terminal screw 1 according to the present disclosure has limitation to translation and rotation in X, Y direction (i.e. perpendicular to Z direction) during the terminal screw 1 moving towards the locking position and during the terminal screw 1 moving towards the releasing position, which can effectively reduce the damage risk of the terminal and the port caused by the translocation of the screw. The rotation reserved in the Z direction can enable the screw to rotate freely at the loosening position, and the situation that the assembly of the terminal screw and the pressing plate generates internal stress to damage each thread is avoided.
While the disclosure has been described in the specification and drawings with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the disclosure as defined in the claims. Moreover, the combination and arrangement of features, elements and/or functions between specific embodiments herein is clearly apparent and thus, in light of this disclosure, one skilled in the art will appreciate that features, elements and/or functions of an embodiment may be incorporated into another specific embodiment as appropriate, unless described otherwise, above. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. Therefore, it is intended that the disclosure not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this disclosure, but that the disclosure will include all embodiments falling within the scope of the foregoing description and the appended claims.
Claims (8)
1. A terminal screw for a ring terminal, the terminal screw comprising a screw head and a screw shank;
an outer surface of the screw head includes a first thread;
the outer surface of the screw shank comprises a shank thread;
it is characterized in that the preparation method is characterized in that,
the outer surface of the screw head also includes a guided shank portion without threads thereon.
2. A terminal screw according to claim 1,
the guided polish rod portion is capable of mating with a cover plate threaded bore forming a shaft bore of a cover plate that is threadably engaged with the first thread such that the terminal screw retains only translational freedom along its longitudinal axis and rotational freedom about its longitudinal axis in the loosened position.
3. A terminal screw according to claim 1,
the guided rod portion is located between the first thread and the screw shank.
4. A terminal screw according to claim 1,
the outer surface of the screw rod part also comprises a rod part groove;
a pressure plate can fit in the rod portion groove.
5. A terminal screw according to claim 4,
the guided polish rod portion is located between the first thread and the shank groove.
6. A terminal screw according to claim 1,
the outer diameter of the screw head is larger than the outer diameter of the screw shaft.
7. A terminal screw according to claim 2,
the outer diameter of the guided polish rod portion is equal to the diameter of a cylindrical surface coinciding with the root of the first thread.
8. A terminal screw according to claim 4,
the guide polished rod portion can contact the pressure plate when in the locking position, so that the pressure plate can provide enough pressing force for the annular terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020527105.3U CN211858906U (en) | 2020-04-10 | 2020-04-10 | Terminal screw for annular terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020527105.3U CN211858906U (en) | 2020-04-10 | 2020-04-10 | Terminal screw for annular terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211858906U true CN211858906U (en) | 2020-11-03 |
Family
ID=73145358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020527105.3U Active CN211858906U (en) | 2020-04-10 | 2020-04-10 | Terminal screw for annular terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211858906U (en) |
-
2020
- 2020-04-10 CN CN202020527105.3U patent/CN211858906U/en active Active
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