Three-rod positioning instrument

Abstract

The invention belongs to the field of positioning instruments, and particularly relates to a three-rod positioning instrument. The three-rod positioning instrument comprises a dial, an ejector rod, a limiting part, a compression spring, a left index rod, a middle index rod, a right index rod, a pointer assembly and a cap. A sleeve is arranged in the center of the dial; the two opposite side walls of the sleeve are provided with side-lying barrel-shaped inner concave parts, and through holes are formed in the bottoms of the inner concave parts; one end of the ejector rod penetrates through the through hole from the open end of the inner concave part and then is provided with a limiting part, and a bulge is arranged on the side wall of the other end of the ejector rod; the compression spring is sleeved on the ejector rod; the first sections, the second sections and the third sections of the left index rod and the right index rod rotate around respective hinge shafts, so that the tip parts can respectively push against the other ends of the two push rods; the cap covers the sleeve so that the left indicator rod and the right indicator rod cannot be separated from the sleeve, and slotted holes are formed in the positions, corresponding to the through holes, of the two opposite side walls of the cap. The three indicator rods can be folded and stored, the occupied space of the three-rod positioning instrument is reduced, and meanwhile the three indicator rods can be folded to serve as tools for disassembling the indicator rods.

Description

Technical Field

[0001] The invention belongs to the field of locators, and in particular relates to a three-rod locator. Background Art

[0002] Three-rod locators are generally used to determine positions in fields such as navigation. Three-rod locators usually have three adjustable poles, which are generally made of lightweight and strong materials, such as aluminum alloy, for easy operation and use on board.

[0003] The three-rod locator currently in use is relatively large and inconvenient to carry. As a precision instrument, its dial is easily damaged, for example, the shaft is particularly prone to rust, and the spring clip is prone to lose elasticity or lose parts, etc., so it needs to be disassembled and repaired frequently. The existing three-rod locator has a cap set at the shaft and fixed on the dial with screws. Specific tools such as screwdrivers are required during the disassembly process. When used outdoors, tools such as screwdrivers are not often carried, which is very troublesome if a malfunction occurs. Summary of the invention

[0004] The invention can effectively solve the problems in the background technology.

[0005] The present invention provides a three-rod positioning instrument, comprising a dial, a top rod, a limiter, a compression spring, an indicator left rod, an indicator middle rod, an indicator right rod, a pointer assembly, and a cap;

[0006] A sleeve is provided at the center of the dial; two opposite side walls of the sleeve are provided with sideways barrel-shaped inner concave parts, and a through hole is provided at the bottom of the inner concave part;

[0007] One end of the push rod passes through the through hole from the opening end of the inner concave part and then is installed with the limiting part. The side wall of the other end of the push rod is provided with a protrusion, and the protrusion and the limiting part limit the push rod from being separated from the through hole.

[0008] The compression spring is sleeved on the top rod, and the compression spring is located between the protrusion and the bottom of the inner concave part;

[0009] One end of the middle rod of the indicator is fixed to the scale plate; one end of the left rod of the indicator and the right rod of the indicator can be rotatably sleeved on the sleeve; the left rod of the indicator and the right rod of the indicator are both provided with a first section, a second section and a third section; one end of the first section is sleeved on the sleeve, and the other end of the first section is hinged to one end of the second section; the other end of the second section is hinged to one end of the third section; the other end of the third section has a tip, and the first section, the second section and the third section of the left rod of the indicator and the right rod of the indicator can be rotated around their respective hinge axes so that the tips can respectively push against the other ends of the two push rods;

[0010] The pointer assembly is provided with two groups and is respectively fixed to the left indicator rod and the right indicator rod; the pointer assembly can drive the left indicator rod and the right indicator rod to rotate around the axis of the sleeve;

[0011] The cap is arranged on the sleeve so that the left indicator rod and the right indicator rod cannot be separated from the sleeve, and slots are arranged at the positions of the two opposite side walls of the cap corresponding to the through holes; the other end of the push rod is located in the slot in the natural state of the compression spring.

[0012] As a further optimization of the present invention, a flange is provided at the open end of the cap.

[0013] As a further optimization of the present invention, the other end of the push rod is hemispherical; the tip end is hemispherical corresponding to the other end of the push rod.

[0014] As a further optimization of the present invention, the side wall of the first section is provided with a first accommodating groove; the second section can be completely received in the first accommodating groove by rotating around the hinge axis with the first section; the side wall of the second section is provided with a second accommodating groove; the third section can be completely received in the second accommodating groove by rotating around the hinge axis with the second section.

[0015] As a further optimization of the present invention, the push rod is cylindrical; and the limiting part is a retaining spring.

[0016] The invention provides a three-rod locator, wherein three indicator rods can be folded and stored, thereby reducing the occupied space of the three-rod locator, and the three indicator rods can be folded and used as a tool for disassembling the indicator rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the appearance structure of the present invention;

[0018] Figure 2 It is a schematic cross-sectional view of the installation part of the cap of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the indicator rod of the present invention;

[0020] Figure 4 yes Figure 3 A partial enlarged schematic diagram;

[0021] Figure 5 yes Figure 3 Schematic diagram of the structure after folding;

[0022] Among them, the dial 1, the sleeve 1a, the inner recess 1a1, the through hole 1a2, the push rod 2, the protrusion 2a, the limit part 3, the compression spring 4, the indicator left rod 5, the first section 5a, the first accommodating groove 5a1, the second section 5b, the second accommodating groove 5b1, the third section 5c, the tip 5c1, the indicator middle rod 6, the indicator right rod 7, the pointer assembly 8, the cap 9, the slot 9a, and the flange 9b. DETAILED DESCRIPTION

[0023] like Figure 1-5As shown, this embodiment includes a dial 1, a push rod 2, a limit portion 3, a compression spring 4, an indicator left rod 5, an indicator middle rod 6, an indicator right rod 7, a pointer assembly 8, and a cap 9.

[0024] A sleeve 1a is provided at the center of the dial 1. Two opposite side walls of the sleeve 1a are provided with sideways barrel-shaped inner recesses 1a1, the two inner recesses 1a1 have openings facing each other, and a through hole 1a2 is provided at the bottom of the inner recesses 1a1.

[0025] In this embodiment, the push rod 2 is cylindrical, and one end of the push rod 2 passes through the through hole 1a2 from the open end of the inner concave portion 1a1 and is then installed with the limiting portion 3. The limiting portion 3 is a retaining spring, and a retaining groove is provided on the side wall of one end of the push rod 2. The retaining spring is retained on the retaining groove, and the diameter of the retaining spring is greater than the diameter of the through hole 1a2. In other embodiments, the limiting portion 3 may be a baffle, the size of which is greater than the through hole 1a2, and the baffle is fixed to the end surface of one end of the push rod 2.

[0026] A protrusion 2a is provided on the side wall of the other end of the push rod 2. The size of the protrusion 2a is larger than the through hole 1a2. The protrusion 2a and the limiter 3 limit the push rod 2 from leaving the through hole 1a2. The compression spring 4 is sleeved on the push rod 2 and is located between the protrusion 2a and the bottom of the inner recess 1a1.

[0027] The indicator rod includes an indicator left rod 5, an indicator middle rod 6 and an indicator right rod 7. One end of the indicator middle rod 6 is fixed to the scale plate 1, and one end of the indicator left rod 5 and the indicator right rod 7 can be rotatably sleeved on the sleeve 1a. The indicator left rod 5, the indicator middle rod 6 and the indicator right rod 7 have similar structures. Here, the indicator left rod 5 is used as an example. The indicator left rod 5 is provided with a first section 5a, a second section 5b and a third section 5c. One end of the first section 5a is sleeved on the sleeve 1a, and the other end of the first section 5a is hinged to one end of the second section 5b; the other end of the second section 5b is hinged to one end of the third section 5c; the other end of the third section 5c is a tip 5c1. The first section 5a, the second section 5b and the third section 5c of the indicator left rod 5 and the indicator right rod 7 rotate around their respective hinge axes to make the tip 5c1 respectively push up the other ends of the two top rods 2. Under this structure, the indicator left rod 5, the indicator middle rod 6 and the indicator right rod 7 can be folded up to reduce the storage space.

[0028] Preferably, the side wall of the first section 5a is provided with a first receiving groove 5a1; the second section 5b can be completely received in the first receiving groove 5a1 by rotating around the hinge axis with the first section 5a; the side wall of the second section 5b is provided with a second receiving groove 5b1; the third section 5c can be completely received in the second receiving groove 5b1 by rotating around the hinge axis with the second section 5b. Since the first section 5a, the second section 5b and the third section 5c of the indicator left rod 5 and the indicator right rod 7 need to be rotated around their respective hinge axes so that the tip 5c1 can respectively push against the other ends of the two push rods 2, when the second section 5b is received in the first section 5a, the second receiving groove 5b1 is opposite to the opening of the first receiving groove 5a1, so as to prevent the second receiving groove 5b1 and the first receiving groove 5a1 from accumulating dust.

[0029] The pointer assembly 8 is provided with two groups and is fixed to the left indicator rod 5 and the right indicator rod 7 respectively; the pointer assembly 8 can drive the left indicator rod 5 and the right indicator rod 7 to rotate around the axis of the sleeve 1a. Specifically, the scale plate 1 is designed to be divided into two layers, the upper layer is marked with scales, and the lower layer is provided with a gear ring. The pointer on the pointer assembly 8 fits on the lower layer and points to the scale of the upper layer. The pointer assembly 8 is provided with a worm gear meshing with the gear ring, and the worm gear is provided with a handle. By rotating the worm gear, the pointer is driven to rotate around the scale of the upper layer.

[0030] The cap 9 is placed on the sleeve 1a so that the indicator left rod 5 and the indicator right rod 7 cannot be separated from the sleeve 1a. Specifically, the open end of the cap is provided with a flange 9b to prevent the indicator left rod and the indicator right rod 7 from being separated from the sleeve 1a. The two opposite side walls of the cap 9 are provided with slots 9a at positions corresponding to the through holes 1a2. The compression spring 4 is in a natural state so that the other end of the push rod 2 is located in the slot 9a. In this way, the push rod 2 will not come out, preventing the hand from accidentally touching the push rod 2 to open the cap 9.

[0031] Preferably, the other end of the push rod 2 is hemispherical, and the tip 5c1 of the third section 5c is hemispherical corresponding to the other end of the push rod 2.

[0032] When it is necessary to remove the indicator left rod 5 and the indicator right rod 7, it is only necessary to rotate the indicator left rod 5 and the indicator right rod 7 so that the hemispherical ends of the indicator left rod 5 and the indicator right rod 7 respectively press against the hemispherical ends of the two push rods 2, and the push rod 2 overcomes the elastic force of the compression spring 4, and the hemispherical ends of the push rod 2 retract into the inner recess 1a1, and then the cap 9 can be removed by rotating it, and then the indicator left rod 5 and the indicator right rod 7 can be easily removed from the sleeve 1a.

[0033] The indicator rod in this embodiment is convenient for storage and can also be used as a tool for opening the cap 9.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A three-rod positioning instrument, characterized in that: It includes a dial, a push rod, a limit part, a compression spring, an indicator left rod, an indicator middle rod, an indicator right rod, a pointer assembly, and a cap; A sleeve is provided at the center of the dial; two opposite side walls of the sleeve are provided with sideways barrel-shaped inner concave parts, and a through hole is provided at the bottom of the inner concave part; One end of the push rod passes through the through hole from the opening end of the inner concave part and then is installed with the limiting part. The side wall of the other end of the push rod is provided with a protrusion, and the protrusion and the limiting part limit the push rod from being separated from the through hole. The compression spring is sleeved on the top rod, and the compression spring is located between the protrusion and the bottom of the inner concave part; One end of the middle rod of the indicator is fixed to the scale plate; one end of the left rod of the indicator and the right rod of the indicator can be rotatably sleeved on the sleeve; the left rod of the indicator and the right rod of the indicator are both provided with a first section, a second section and a third section; one end of the first section is sleeved on the sleeve, and the other end of the first section is hinged to one end of the second section; the other end of the second section is hinged to one end of the third section; the other end of the third section has a tip, and the first section, the second section and the third section of the left rod of the indicator and the right rod of the indicator can be rotated around their respective hinge axes so that the tips can respectively push against the other ends of the two push rods; The pointer assembly is provided with two groups and is respectively fixed to the left indicator rod and the right indicator rod; the pointer assembly can drive the left indicator rod and the right indicator rod to rotate around the axis of the sleeve; The cap is arranged on the sleeve so that the left indicator rod and the right indicator rod cannot be separated from the sleeve, and slots are arranged at the positions of the two opposite side walls of the cap corresponding to the through holes; the other end of the push rod is located in the slot in the natural state of the compression spring.

2. A three-rod positioning instrument according to claim 1, characterized in that: The open end of the cap is provided with a flange.

3. A three-rod positioning instrument according to claim 1, characterized in that: The other end of the push rod is hemispherical; the tip end is hemispherical corresponding to the other end of the push rod.

4. A three-rod locator according to claim 1, characterized in that: The side wall of the first section is provided with a first receiving groove; the second section can be completely received in the first receiving groove by rotating around the hinge axis with the first section; the side wall of the second section is provided with a second receiving groove; the third section can be completely received in the second receiving groove by rotating around the hinge axis with the second section.

5. A three-rod locator according to claim 1, characterized in that: The top rod is cylindrical; The limiting part is a retaining spring.

Images