Straight cylinder threaded jack

Abstract

The utility model discloses a straight cylinder thread jack which comprises an outer supporting cylinder and an inner thread straight cylinder fixed in the outer supporting cylinder, the inner thread of the inner thread straight cylinder is matched with a threaded shaft, and the top end of the threaded shaft penetrates to the outer portion of the outer supporting cylinder and is fixedly provided with a round supporting foot. An internal thread adjusting sleeve is arranged at one end of the surface of the threaded shaft, and a secondary protecting sleeve is arranged between the internal thread adjusting sleeve and the circular supporting foot. The two-stage telescopic protective sleeve is formed by the first-stage protective sleeve and the second-stage protective sleeve, the threaded groove can be effectively covered, external substances such as dust, dirt and water are prevented from directly making contact with the threaded groove, and therefore the threaded shaft is not prone to being damaged by the external substances in the operation process, friction of a threaded mechanism is reduced, and the service life of the threaded shaft is prolonged. And the jack can be used in a wet or corrosive environment.

Description

Technical Field

[0001] The utility model relates to the technical field of threaded jacks, in particular to a straight-tube threaded jack. Background Art

[0002] A straight-barrel threaded jack is a lifting device whose main structure includes a base, a lifting screw, a handle, a jack base and a jack lever. Through a precise threaded mechanism, the user transmits torque by rotating the handle so that the threads on the screw match the nut on the base, thereby converting a smaller force into a force sufficient to lift or support a heavy object. It provides users with a simple and effective mechanical means to complete lifting and supporting tasks through mechanical principles, and can also be used for fastening and fixing work. However, at the current stage, when a straight-barrel threaded jack lifts and supports heavy objects, the lifting screw needs to be gradually lifted out of the base. At this time, the thread groove of the lifting screw is directly exposed to the external environment, especially in a humid or corrosive environment. The thread groove is easily invaded by external substances such as dust, dirt, and moisture, and damage to the thread groove will directly lead to instability and reduced reliability of the jack's lifting function. Utility Model Content

[0003] The utility model aims to provide a straight-tube threaded jack, on which a double-stage retractable protective sleeve is arranged on a threaded rod, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a straight barrel threaded jack, comprising an outer support barrel and an internally threaded straight barrel fixed inside the outer support barrel, the internal thread of the internally threaded straight barrel being matched with a threaded shaft, the top end of the threaded shaft passing through the outside of the outer support barrel and being fixed with a circular support foot, an internally threaded adjustment sleeve being arranged at one end of the surface of the threaded shaft, a secondary protective sleeve being arranged between the internally threaded adjustment sleeve and the circular support foot, and a primary protective sleeve being arranged on the outer peripheral surface of the outer support barrel for being interconnected with the outer wall of the internally threaded adjustment sleeve.

[0005] Preferably, a countersunk hole is provided at the center position of the bottom end of the outer support tube, and a supporting ring is fixed at one end inside the countersunk hole, and an internally threaded connecting sleeve is fixed at the center position of the bottom end of the internally threaded straight tube.

[0006] Preferably, a through hole is provided inside the support ring, and a bolt for bolting with the internal threaded connecting sleeve is provided in the internal through hole of the support ring.

[0007] Preferably, the first-level protective sleeve includes an outer protective sleeve fixed on the outer wall of the outer support sleeve, and a first-level telescopic sleeve slidably installed inside the outer protective sleeve, and the top end of the first-level telescopic sleeve penetrates to the outside of the outer protective sleeve and is fixedly connected to the outer wall of the internal threaded adjustment sleeve.

[0008] Preferably, an annular lip is fixed to one end of the surface of the internal thread adjustment sleeve, and the bottom end of the annular lip is fixedly connected to the top end of the primary telescopic cylinder.

[0009] Preferably, the secondary protective sleeve includes an annular groove arranged inside the internal thread adjustment sleeve, and a secondary telescopic cylinder slidably installed inside the annular groove, and the top end of the secondary telescopic cylinder is fixedly connected to the bottom end of the circular support foot.

[0010] Preferably, the outer circumferential surfaces of the circular support foot and the internally threaded adjustment sleeve are both provided with knurled patterns.

[0011] Compared with the prior art, the beneficial effect of the utility model is that the straight-barrel threaded jack is provided with a threaded shaft and a first-level protective sleeve and other structures that cooperate with each other, and the threaded mechanism realizes the transmission and conversion of force, so that a smaller force can produce a larger lifting effect, and the first-level protective sleeve and the second-level protective sleeve form a two-stage retractable protective sleeve, which can effectively cover the thread groove and prevent external substances such as dust, dirt, and moisture from directly contacting the thread groove, so that the threaded shaft is not easily affected by these external damages during operation, reducing the friction of the threaded mechanism, which is beneficial to the use of the jack in a wet or corrosive environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 The three-dimensional structure of the outer support tube of the utility model is shown in FIG. Figure 1 ;

[0014] Figure 3 The three-dimensional structure of the outer support tube of the utility model is shown in FIG. Figure 2 ;

[0015] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0016] In the figure: 1. outer support tube; 101. countersunk hole; 102. support ring; 2. internally threaded straight tube; 3. internally threaded connecting sleeve; 4. threaded shaft; 5. round support foot; 6. internally threaded adjustment sleeve; 7. primary protective sleeve; 701. outer protective sleeve; 702. primary telescopic tube; 703. annular lip; 8. secondary protective sleeve; 801. annular countersunk groove; 802. secondary telescopic tube; 9. knurled mesh pattern. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4 The utility model provides an embodiment: a straight-tube threaded jack, comprising an outer support tube 1 and an inner-threaded straight tube 2 fixed inside the outer support tube 1, the inner thread of the inner-threaded straight tube 2 is matched with a threaded shaft 4, the top of the threaded shaft 4 penetrates the outside of the outer support tube 1 and is fixed with a round support foot 5, one end of the surface of the threaded shaft 4 is provided with an inner-threaded adjustment sleeve 6, the threaded shaft 4 is lifted and lowered along the vertical direction of the inner-threaded straight tube 2 until the round support foot 5 is pressed against the bottom end of the weight, thereby realizing the transmission and conversion of force through the threaded mechanism, so that a smaller force can produce a larger lifting effect;

[0019] A secondary protective sleeve 8 is provided between the internal thread adjustment sleeve 6 and the circular support foot 5, and a primary protective sleeve 7 for interconnecting with the outer wall of the internal thread adjustment sleeve 6 is provided on the outer peripheral surface of the outer support tube 1;

[0020] A countersunk hole 101 is provided at the center position of the bottom end of the outer support tube 1, and a support ring 102 is fixed at one end inside the countersunk hole 101, and an internally threaded connecting sleeve 3 is fixed at the center position of the bottom end of the internally threaded straight tube 2. A through hole is provided inside the support ring 102, and a bolt for bolting with the internally threaded connecting sleeve 3 is provided in the internal through hole of the support ring 102. The staff can take out the bolt, so that the bolt passes into the countersunk hole 101 and is bolted with the internally threaded connecting sleeve 3, thereby tightening the internally threaded straight tube 2 and the outer support tube 1, so as to improve the connection strength between the outer support tube 1 and the internally threaded straight tube 2;

[0021] The outer circumferences of the circular support foot 5 and the internal thread adjustment sleeve 6 are both provided with a knurled mesh pattern 9, which increases the surface roughness of the circular support foot 5 and the internal thread adjustment sleeve 6 and improves the friction force, so that the user can more easily screw the circular support foot 5 and the internal thread adjustment sleeve 6 to adjust the support height of the jack;

[0022] The primary protective sleeve 7 includes an outer protective sleeve 701 fixed on the outer wall of the outer support tube 1, and a primary telescopic tube 702 slidably installed inside the outer protective sleeve 701, the top end of the primary telescopic tube 702 penetrates the outside of the outer protective sleeve 701 and is fixedly connected to the outer wall of the internal thread adjustment sleeve 6, and an annular lip 703 is fixed on one end of the surface of the internal thread adjustment sleeve 6, and the bottom end of the annular lip 703 is fixedly connected to the top end of the primary telescopic tube 702;

[0023] When the threaded shaft 4, the circular support foot 5, and the internal threaded adjustment sleeve 6 move upward, since the outer protective sleeve 701 is fixed to the outside of the outer support tube 1, the internal threaded adjustment sleeve 6 will actively drive the annular lip 703 and the primary telescopic tube 702 to move upward, thereby changing the combined length of the primary telescopic tube 702 and the outer protective sleeve 701;

[0024] The secondary protective sleeve 8 includes an annular groove 801 arranged inside the internal thread adjustment sleeve 6, and a secondary telescopic cylinder 802 slidably installed inside the annular groove 801. The top of the secondary telescopic cylinder 802 is fixedly connected to the bottom end of the circular support foot 5. The staff can also manually screw the internal thread adjustment sleeve 6 so that the internal thread adjustment sleeve 6 drives the annular lip 703 and the primary telescopic cylinder 702 to rotate, thereby adjusting the height position of the internal thread adjustment sleeve 6 on the threaded shaft 4. At this time, the secondary telescopic cylinder 802 extends into or out of the annular groove 801, and then adjusts the combined length of the secondary telescopic cylinder 802 and the internal thread adjustment sleeve 6, so that the thread groove line of the threaded shaft 4 is always covered. Compared with the design of directly exposing the thread groove, the introduction of the protective sleeve makes maintenance work easier, can keep the threaded mechanism clean, and extend the maintenance cycle of the jack.

[0025] When the embodiment of the present application is in use, the staff first places the jack at the bottom of the weight, and then the staff drives the circular support foot 5 to rotate manually or through an adjustable wrench, so that the circular support foot 5 and the threaded shaft 4 rotate together, and the threaded shaft 4 is lifted and lowered along the vertical direction of the internal thread straight cylinder 2 until the circular support foot 5 is tightly against the bottom of the weight, thereby realizing the transmission and conversion of force through the threaded mechanism, so that a smaller force can produce a larger lifting effect. During the upward movement of the circular support foot 5 and the internal threaded adjustment sleeve 6, the internal threaded adjustment sleeve 6 will cause the primary protective sleeve 7 to passively The first-stage protective cover 7 actively covers the external thread groove below the internal thread adjustment cover 6, while the second-stage protective cover 8 actively covers the external thread groove below the circular support foot 5. At this time, the threaded shaft 4 has no thread groove line exposed to the environment, and then the double-stage retractable protective cover is used to effectively cover the thread groove, preventing external substances such as dust, dirt, and moisture from directly contacting the thread groove, so that the threaded shaft 4 is not easily affected by these external damages during operation, which reduces the friction of the threaded mechanism, is beneficial to the use of the jack in a humid or corrosive environment, and increases the service life of the jack.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A straight threaded jack, characterized in that: The invention comprises an outer support tube (1) and an internally threaded straight tube (2) fixed inside the outer support tube (1); the internal thread of the internally threaded straight tube (2) is matched with a threaded shaft (4); the top end of the threaded shaft (4) penetrates the outside of the outer support tube (1) and is fixed with a circular support foot (5); an internally threaded adjustment sleeve (6) is arranged at one end of the surface of the threaded shaft (4); a secondary protective sleeve (8) is arranged between the internally threaded adjustment sleeve (6) and the circular support foot (5); and a primary protective sleeve (7) for interconnecting with the outer wall of the internally threaded adjustment sleeve (6) is arranged on the outer peripheral surface of the outer support tube (1).

2. A straight threaded jack according to claim 1, characterized in that: A countersunk hole (101) is provided at the center of the bottom end of the outer support tube (1), and a support ring (102) is fixed at one end inside the countersunk hole (101), and an internal thread connection sleeve (3) is fixed at the center of the bottom end of the internal thread straight tube (2).

3. A straight threaded jack according to claim 2, characterized in that: A through hole is provided inside the support ring (102), and a bolt for bolting to the internal threaded connection sleeve (3) is provided in the internal through hole of the support ring (102).

4. A straight threaded jack according to claim 1, characterized in that: The primary protective sleeve (7) comprises an outer protective sleeve (701) fixed on the outer wall of the outer support sleeve (1), and a primary telescopic sleeve (702) slidably mounted inside the outer protective sleeve (701), wherein the top end of the primary telescopic sleeve (702) penetrates the outside of the outer protective sleeve (701) and is fixedly connected to the outer wall of the internal thread adjustment sleeve (6).

5. A straight threaded jack according to claim 4, characterized in that: An annular lip (703) is fixed to one end of the surface of the internal thread adjustment sleeve (6), and the bottom end of the annular lip (703) is fixedly connected to the top end of the primary telescopic cylinder (702).

6. A straight threaded jack according to claim 1, characterized in that: The secondary protective sleeve (8) comprises an annular recessed groove (801) arranged inside the internal threaded adjustment sleeve (6), and a secondary telescopic cylinder (802) slidably mounted inside the annular recessed groove (801), wherein the top end of the secondary telescopic cylinder (802) is fixedly connected to the bottom end of the circular support foot (5).

7. A straight threaded jack according to claim 1, characterized in that: The outer circumferences of the circular support foot (5) and the internal thread adjustment sleeve (6) are both provided with knurled mesh patterns (9).

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