Tapered thread gauge

Abstract

The utility model provides a conical thread gauge, which is used for detecting the thread pitch diameter of a cylindrical external thread part and comprises a body, the center of the body is provided with a conical threaded hole, the bottom surface of the body is a plane, and the bottom surface corresponds to the large-diameter end of the conical threaded hole; the top face is a step face and corresponds to the small-diameter end of the conical threaded hole, and each step of the step face extends to the conical threaded hole. The conical thread gauge provided by the utility model can break through the traditional structure of the conventional cylindrical thread gauge for detecting the cylindrical external thread, and adopts the conical threaded hole to measure the pitch diameter of the cylindrical external thread, so that the pitch diameter of the cylindrical thread can be evaluated more accurately by naked eyes.

Description

Technical Field

[0001] The utility model relates to the technical field of thread detection, in particular to a conical thread gauge with scale for detecting the effective pitch diameter of external cylindrical threads. Background Art

[0002] Existing thread gauges for detecting external cylindrical threads all adopt cylindrical threads. Therefore, when measuring cylindrical threads, there are only two situations: "pass" and "not pass". If it passes, it means that the size of the thread is smaller than the limit size calibrated by the gauge; if it does not pass, it means that the size of the thread is larger than the limit size calibrated by the gauge. So the cylindrical thread gauge cannot accurately measure the size of the cylindrical thread (usually the pitch diameter). When measuring whether a thread meets the design requirements, two gauges of different sizes (i.e., the go gauge and the no-go gauge) are needed, and it is determined whether the cylindrical thread meets the design requirements through two measurements. Content of the Utility Model

[0003] The technical problem to be solved by the embodiment of the utility model is to provide a conical thread gauge with scale, which solves the problem that when the existing cylindrical thread gauge is used, it can only show "pass" or "not pass" and cannot accurately measure the pitch diameter of the thread, and can measure the pitch diameter of the thread more accurately.

[0004] To solve the above technical problem, the utility model provides a conical thread gauge, which includes a body. The center of the body has a conical thread hole. The bottom surface of the body is a plane, corresponding to the large diameter end of the conical thread hole; the top surface is a stepped surface, corresponding to the small diameter end of the conical thread hole, and each step of the stepped surface extends to the conical thread hole.

[0005] The stepped surface is formed by cutting down once from the top surface of the thread hole to form two stepped surfaces, including a first stepped surface and a second stepped surface. Among them, the first stepped surface is the bottom surface and the second stepped surface is the top surface; scale lines are provided on the vertical surface connecting the first stepped surface and the second stepped surface.

[0006] The central angle of the tangency area between the first stepped surface and the conical thread hole is less than 180 degrees, preferably between 90 - 120 degrees.

[0007] The stepped surface is formed by cutting down from the top surface of the thread hole to form at least three stepped surfaces, and each stepped surface extends to the thread hole.

[0008] The at least three stepped surfaces include a first stepped surface, a second stepped surface and a third stepped surface, and the heights of the first stepped surface, the second stepped surface and the third stepped surface increase in sequence.

[0009] The height difference of the three stepped surfaces is less than 2 / 3 of the thickness of the whole conical thread gauge.

[0010] When there are three stepped surfaces, the central angle of the tangency region between each stepped surface and the tapered threaded hole is less than 180 degrees and greater than 90 degrees, and the total angle of the three stepped surfaces is 360 degrees.

[0011] The central angles of the tangency regions between the three stepped surfaces and the tapered threaded hole are 120 degrees respectively.

[0012] The first stepped surface cuts directly through the tapered threaded hole, and the second and third stepped surfaces form equal divisions.

[0013] When there are four stepped surfaces, the central angle of the tangency region between each stepped surface and the tapered threaded hole is 90 degrees; or they are 60 degrees, 60 degrees, 60 degrees, and 180 degrees from small to large respectively.

[0014] The stepped surface at the top, i.e., the top surface, has a central angle of the tangency region with the tapered threaded hole that is not less than that of any other stepped surface's tangency region with the tapered threaded hole.

[0015] There are scale lines on the vertical surface tangent between the first stepped surface and the last stepped surface, and each scale line corresponds to a different pitch diameter on the tapered threaded hole.

[0016] The scale value is associated with the pitch diameter taper of the middle diameter cone of the taper thread gauge, and the pitch diameter taper of the taper thread gauge is selected considering factors such as the cylindrical thread model specification, the pitch diameter tolerance range of the cylindrical thread, the engagement length of the cylindrical thread, and convenient calculation.

[0017] The taper thread gauge with scale for detecting the effective pitch diameter of the external cylindrical thread provided by the present utility model can break through the traditional structure of the existing cylindrical thread gauge, measure the pitch diameter size of the thread by means of a tapered threaded hole, and can more accurately evaluate the pitch diameter size of the thread with the naked eye. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view structural schematic diagram of the taper thread gauge described in the first embodiment of the present utility model.

[0019] Figure 2 It is a side view structural schematic diagram of the taper thread gauge described in the first embodiment of the present utility model.

[0020] Figure 3 It is a top view structural schematic diagram of the taper thread gauge described in the second embodiment of the present utility model.

[0021] Figure 4 It is a side view structural schematic diagram of the taper thread gauge described in the second embodiment of the present utility model.

[0022] Figure 5 It is Figure 3 a cross-sectional view of the A-A section in DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] like Figures 1 - 5 As shown, the utility model provides a tapered thread gauge with a scale for detecting the effective mean diameter of a cylindrical external thread, comprising a main body, a tapered threaded hole 15 at the center of the main body, the bottom surface of the main body being a plane, the bottom surface corresponding to the large diameter end of the tapered threaded hole 15; the top surface being a step surface corresponding to the small diameter end of the tapered threaded hole 15, and each step of the step surface extending to the tapered threaded hole 15, so that each step surface can observe the limit position of the threaded part to be measured inside the tapered threaded hole 15, and then judge the thread mean diameter value of the threaded part to be measured according to the visual limit position, and the value is a visual estimated value, which can be estimated according to the screw-in depth of the threaded part; the deeper the screw-in depth, the smaller the thread mean diameter value of the threaded part reaching the tapered threaded hole 15; since the thread mean diameter value corresponding to each step surface of the tapered threaded hole is determined, the approximate range of the thread mean diameter of the threaded part to be measured can be judged according to the visual screw-in depth. In particular, each scale line 16 on the facade 14 corresponds to the thread pitch diameter value at its location, so that the scale lines on the facade 14 can be used to assist in accurately determining the thread pitch diameter of the threaded part to be measured.

[0027] The conical thread gauge with scale for detecting the effective pitch diameter of external cylindrical threads provided by the present utility model can break through the traditional structure of the existing cylindrical thread gauge, measure the pitch diameter of the cylindrical thread by means of a tapered thread hole, and can more accurately evaluate the effective pitch diameter of the cylindrical thread by the naked eye.

[0028] The conical thread gauge with scale for detecting the effective pitch diameter of external cylindrical threads provided by the present utility model realizes the measurement of the pitch diameter of the cylindrical thread of the part to be measured with a very simple structure, thereby providing a reference for users.

[0029] As Figures 1 - 2 shown, the stepped surface is formed by cutting downwards once from the top surface of the thread hole, including a first stepped surface 11 and a second stepped surface 12, wherein the first stepped surface 11 is the bottom surface and the second stepped surface 12 is the top surface; scale lines 14 are provided on the vertical surface connecting the first stepped surface 11 and the second stepped surface 12.

[0030] The central angle of the tangent region between the first stepped surface 11 and the tapered thread hole 15 is less than 180 degrees, preferably between 90 and 120 degrees.

[0031] As Figures 3 - 5 shown, the stepped surface is formed by cutting downwards from the top surface of the thread hole to form at least three stepped surfaces, and each stepped surface extends to the thread hole.

[0032] The at least three stepped surfaces include a first stepped surface 11, a second stepped surface 12 and a third stepped surface 13, wherein the heights of the first stepped surface 11, the second stepped surface 12 and the third stepped surface 13 increase in sequence.

[0033] The height difference of the three stepped surfaces is less than 2 / 3 of the thickness of the entire conical thread gauge.

[0034] When there are three stepped surfaces, the central angle of the tangent region of each stepped surface with the tapered thread hole is less than 180 degrees and greater than 90 degrees, and the total angle of the three stepped surfaces is 360 degrees.

[0035] The central angles of the tangent regions of the three stepped surfaces with the tapered thread hole are 120 degrees respectively.

[0036] Refer to Figure 1 、 Figure 3 , the first stepped surface 11 is cut straight through the tapered thread hole 15, and the second stepped surface 12 and the third stepped surface 13 are equally divided.

[0037] When there are four stepped surfaces, the central angle of the tangent region of each stepped surface with the tapered thread hole is 90 degrees; or they are 60 degrees, 60 degrees, 60 degrees, and 180 degrees from small to large respectively.

[0038] The stepped surface located at the top, i.e., the top surface, has a central angle of the tangency region with the tapered threaded hole that is not less than the central angle of the tangency region of any other stepped surface with the tapered threaded hole.

[0039] Scale lines 16 are provided on the vertical surface 14 tangent between the first stepped surface and the last stepped surface, and each scale line corresponds to a different diameter on the tapered threaded hole.

[0040] The scale value at the scale line 16 is associated with the pitch cone taper of the pitch diameter of the taper thread gauge, and the pitch cone taper of the taper thread gauge is selected by comprehensively considering factors such as the cylindrical thread model specification, the pitch diameter tolerance range of the cylindrical thread, the engagement length of the cylindrical thread, and convenience of calculation.

[0041] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0042] The above-described embodiments merely represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A taper thread gauge for detecting the pitch diameter of the thread of a cylindrical external thread part, comprising a body, characterized in that, The center of the body has a tapered threaded hole. The bottom surface of the body is a plane, corresponding to the large-diameter end of the tapered threaded hole; the top surface is a stepped surface, corresponding to the small-diameter end of the tapered threaded hole, and each step of the stepped surface extends to the tapered threaded hole.

2. The conical thread gauge according to claim 1, wherein the stepped surface is formed by two stepped surfaces cut downward once from the top surface of the threaded hole, including a first stepped surface and a second stepped surface, where the first stepped surface is the bottom surface and the second stepped surface is the top surface; scale lines are provided on the vertical surface connecting the first stepped surface and the second stepped surface.

3. The conical thread gauge according to claim 2, wherein the central angle of the region where the first stepped surface is tangent to the tapered threaded hole is between 90° and 120°.

4. The conical thread gauge according to claim 1, wherein the stepped surface is formed by cutting downward from the top surface of the threaded hole to form at least three stepped surfaces, and each stepped surface extends to the threaded hole.

5. The conical thread gauge according to claim 4, wherein the at least three stepped surfaces include a first stepped surface, a second stepped surface, and a third stepped surface, and the heights of the first stepped surface, the second stepped surface, and the third stepped surface increase in sequence.

6. The conical thread gauge according to claim 4, wherein the height difference of the three stepped surfaces is less than 2 / 3 of the thickness of the entire conical thread gauge.

7. The conical thread gauge according to claim 4, wherein when there are three stepped surfaces, the central angle of the region where each stepped surface is tangent to the tapered threaded hole is less than 180° and greater than 90°, and the total angle of the three stepped surfaces is 360°.

8. The conical thread gauge according to claim 7, wherein the central angles of the regions where the three stepped surfaces are tangent to the tapered threaded hole are 120° respectively.

9. The conical thread gauge according to claim 8, wherein the first stepped surface is cut straight through the tapered threaded hole, and the second stepped surface and the third stepped surface are equally divided.

10. The conical thread gauge according to claim 4, wherein when there are four stepped surfaces, the central angle of the region where each stepped surface is tangent to the tapered threaded hole is 90°; or they are 60°, 60°, 60°, and 180° from small to large respectively.

Images