Jack with protection device

Abstract

The utility model relates to the technical field of jacks, in particular to a jack with a protection device, which comprises a base, a main frame is arranged at the top end of the base, a transmission shaft is movably mounted on one side of the main frame, and a bevel pinion is arranged at one end, inside the main frame, of the transmission shaft. A threaded sleeve is movably installed at the bottom end of the interior of the main frame through a bearing, a large bevel gear is fixedly installed outside the bottom end of the threaded sleeve, and a threaded rod is in threaded connection with the interior of the threaded sleeve. According to the utility model, the movable strip, the bolt, the positioning groove and the top block are matched for use, the top block stops after being jacked to a specified position, then the two knobs are twisted respectively, and the knobs control the bolt to rotate and go deep until the end of the bolt penetrates through the movable strip and then is in threaded connection with the positioning groove with the corresponding height; in this way, the top block can be fixed at the current height, the top block is prevented from rapidly falling down due to equipment faults, and therefore the purpose of facilitating protection is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of jacks, in particular to a jack with a protective device. Background Art

[0002] A screw jack is a common type of jack that uses a screw to provide lifting force. A screw jack usually consists of a screw and a matching nut. The screw is a long rod with threads, while the nut is a cylinder with internal threads. The threaded fit between them allows the screw to rotate under the action of the nut, thereby providing the function of lifting or lowering.

[0003] When the existing screw jacks on the market are in use, if the internal transmission structure fails, it may cause the top rod to fall rapidly, so that workers may be hit by falling objects during operation. For this reason, we propose a jack with a protective device. Utility Model Content

[0004] The purpose of the utility model is to provide a jack with a protective device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A jack with a protective device, comprising

[0007] A base, wherein a main frame is arranged at the top of the base, a transmission shaft is movably mounted on one side of the main frame, a small bevel gear is arranged at one end of the transmission shaft located inside the main frame, a threaded sleeve is movably mounted on the bottom end of the main frame through a bearing, a large bevel gear is fixedly mounted on the outside of the bottom end of the threaded sleeve, a screw is connected to the internal thread of the threaded sleeve, and a push rod is fixedly mounted on the top end of the screw;

[0008] Side grooves are symmetrically arranged on the outer walls on both sides of the main frame, and protective mechanisms are arranged inside the two side grooves. The protective mechanisms include movable bars, bolts and positioning grooves. A top block is fixedly installed on the top of the top rod, and the top ends of the two movable bars are fixedly connected to the outer walls on both sides of the top block.

[0009] Preferably, a plurality of positioning grooves are provided at equal distances from top to bottom on the inner walls of the two side grooves, the bottom end of the movable bar is threadedly connected to a bolt, the end of the bolt is threadedly connected to one of the plurality of positioning grooves, and a knob is fixedly mounted on the other end of the bolt;

[0010] Preferably, both sides of the inner wall of the main frame are provided with slide grooves, and both sides of the bottom end of the top rod are symmetrically provided with sliders, and the sliders are slidably connected with the slide grooves;

[0011] Preferably, a fixing cylinder is fixedly installed on the top of one side of the main frame close to the transmission shaft, a lifting rod is movably installed inside the fixing cylinder, a ratchet is fixedly installed on the outside of one side of the transmission shaft close to the fixing cylinder, a pawl is fixedly installed on the bottom end of the transmission shaft, and the pawl is movably connected to the ratchet;

[0012] Preferably, a spring is fixedly installed at the inner top of the fixing tube, and the other end of the spring is fixedly sleeved with the lifting rod;

[0013] Preferably, the small bevel gear is meshed with the large bevel gear.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. This jack with a protective device is used in conjunction with a movable bar, a bolt, a positioning groove and a top block. When the top block is lifted to a specified position, it stops, and then two knobs are twisted respectively. The knobs control the bolts to rotate deeper until the end of the bolt passes through the movable bar and is threadedly connected to the positioning groove of the corresponding height. In this way, the top block can be fixed at the current height to avoid the top block from falling quickly due to equipment failure, thereby achieving the purpose of easy protection.

[0016] 2. This jack with a protective device is used in combination with a lifting rod, a ratchet, a pawl and a spring. When it is necessary to control the fall of the top rod, the lifting rod at the top of the fixed cylinder is lifted. When the lifting rod is lifted, the spring is compressed and the pawl is lifted from the top of the ratchet. In this way, the rotation of the transmission shaft can be controlled. The combination of the pawl and the spring can prevent workers from accidentally touching the transmission shaft and causing it to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall main structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0019] Figure 3 For this utility model Figure 2 The enlarged schematic diagram of point A in the middle;

[0020] Figure 4 For this utility model Figure 2 A magnified schematic diagram of point B in the middle.

[0021] In the figure: 1. base; 2. main frame; 3. transmission shaft; 4. small bevel gear; 5. threaded sleeve; 6. screw; 7. push rod; 8. side groove; 9. protection mechanism; 901. movable bar; 902. bolt; 903. positioning groove; 10. push block; 11. knob; 12. slide groove; 13. slider; 14. fixing cylinder; 15. lifting rod; 16. ratchet; 17. pawl; 18. spring; 19. large bevel gear. DETAILED DESCRIPTION

[0022] 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. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. 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.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0024] like Figure 1-4 As shown, a technical solution provided by the utility model:

[0025] A jack with a protective device comprises a base 1, a main frame 2 is arranged at the top of the base 1, a transmission shaft 3 is movably installed on one side of the main frame 2, a small bevel gear 4 is arranged at one end of the transmission shaft 3 located inside the main frame 2, a threaded sleeve 5 is movably installed at the bottom end of the main frame 2 through a bearing, a large bevel gear 19 is fixedly installed on the bottom end of the threaded sleeve 5, a screw rod 6 is connected to the internal thread of the threaded sleeve 5, and a top rod 7 is fixedly installed on the top end of the screw rod 6; the small bevel gear 4 is meshed with the large bevel gear 19; side grooves 8 are symmetrically arranged on the outer walls of both sides of the main frame 2, The two side grooves 8 are both provided with a protection mechanism 9, which includes a movable bar 901, a bolt 902 and a positioning groove 903. A top block 10 is fixedly installed on the top of the top rod 7, and the tops of the two movable bars 901 are fixedly connected to the outer walls of both sides of the top block 10; a plurality of positioning grooves 903 are provided at equal distances from top to bottom on the inner walls of the two side grooves 8, the bottom end of the movable bar 901 is threadedly connected to the bolt 902, and the end of the bolt 902 is threadedly connected to one of the plurality of positioning grooves 903, and a knob 11 is fixedly installed on the other end of the bolt 902;

[0026] In this embodiment, when the top block 10 is lifted to the specified position, it stops and then the two knobs 11 are twisted respectively. The knobs 11 control the bolt 902 to rotate deeper until the end of the bolt 902 passes through the movable bar 901 and is threadedly connected to the positioning groove 903 of the corresponding height. In this way, the top block 10 can be fixed at the current height to prevent the top block 10 from falling quickly due to equipment failure.

[0027] like Figure 4 As shown, both sides of the inner wall of the main frame 2 are provided with slide grooves 12, and both sides of the bottom end of the top rod 7 are symmetrically provided with sliders 13, and the sliders 13 are slidably connected with the slide grooves 12;

[0028] In this embodiment, when the screw rod 6 rotates, the push rod 7 at the top of the screw rod 6 drives the two sliders 13 to slide along the slide groove 12, so that the push rod 7 can be controlled to rise and fall linearly.

[0029] like Figure 3 As shown, a fixing cylinder 14 is fixedly installed on the top of one side of the main frame 2 close to the transmission shaft 3, a lifting rod 15 is movably installed inside the fixing cylinder 14, a ratchet 16 is fixedly installed on the outside of one side of the transmission shaft 3 close to the fixing cylinder 14, a pawl 17 is fixedly installed on the bottom end of the transmission shaft 3, and the pawl 17 is movably connected with the ratchet 16; a spring 18 is fixedly installed on the top of the inner part of the fixing cylinder 14, and the other end of the spring 18 is fixedly sleeved with the lifting rod 15;

[0030] In this embodiment, when it is necessary to control the fall of the push rod 7, the lifting rod 15 at the top of the fixed cylinder 14 is lifted. When the lifting rod 15 is lifted, the spring 18 is compressed and the pawl 17 is lifted from the top of the ratchet 16. In this way, the rotation of the transmission shaft 3 can be controlled. The pawl 17 and the spring 18 are used in conjunction to prevent workers from accidentally touching the transmission shaft 3 and causing it to rotate.

[0031] Working principle: When using the jack, the transmission shaft 3 is rotated by a tool, and the transmission shaft 3 controls the small bevel gear 4 to rotate, and the small bevel gear 4 drives the large bevel gear 19 to rotate, and the large bevel gear 19 drives the threaded sleeve 5 to rotate. When the threaded sleeve 5 rotates, the screw 6 inside it is lifted linearly, and then the object is lifted up by the top block 10 at the top of the top rod 7; when the top block 10 is lifted to the specified position, it stops, and then the two knobs 11 are twisted respectively, and the knob 11 controls the bolt 902 to rotate deeper until the end of the bolt 902 passes through the movable bar 901 and is threadedly connected to the positioning groove 903 of the corresponding height. In this way, the top block 10 can be fixed at the current height to prevent the top block 10 from falling quickly due to equipment failure; when it is necessary to control the top rod 7 to fall, the lifting rod 15 at the top of the fixed cylinder 14 is lifted, and when the lifting rod 15 is lifted, the spring 18 is compressed and the pawl 17 is lifted from the top of the ratchet 16.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A jack with a protective device, characterized in that: include A base (1), wherein a main frame (2) is arranged at the top of the base (1), a transmission shaft (3) is movably mounted on one side of the main frame (2), a small bevel gear (4) is arranged at one end of the transmission shaft (3) located inside the main frame (2), a threaded sleeve (5) is movably mounted on the bottom end of the main frame (2) via a bearing, a large bevel gear (19) is fixedly mounted on the outside of the bottom end of the threaded sleeve (5), a screw rod (6) is connected to the internal thread of the threaded sleeve (5), and a top rod (7) is fixedly mounted on the top end of the screw rod (6); Side grooves (8) are symmetrically arranged at the outer walls on both sides of the main frame (2), and protective mechanisms (9) are arranged inside the two side grooves (8). The protective mechanisms (9) include a movable bar (901), a bolt (902) and a positioning groove (903). A top block (10) is fixedly installed at the top end of the top rod (7), and the top ends of the two movable bars (901) are fixedly connected to the outer walls on both sides of the top block (10).

2. A jack with a protective device according to claim 1, characterized in that: A plurality of positioning grooves (903) are provided at equal distances from top to bottom on the inner walls of the two side grooves (8); the bottom end of the movable bar (901) is threadedly connected to a bolt (902); the end of the bolt (902) is threadedly connected to one of the plurality of positioning grooves (903); and a knob (11) is fixedly mounted on the other end of the bolt (902).

3. The jack with a protective device according to claim 1, characterized in that: Slide grooves (12) are provided on both sides of the inner wall of the main frame (2), and sliding blocks (13) are symmetrically provided on both sides of the bottom end of the top rod (7), and the sliding blocks (13) are slidably connected to the slide grooves (12).

4. The jack with a protective device according to claim 1, characterized in that: A fixing cylinder (14) is fixedly mounted on the top of one side of the main frame (2) close to the transmission shaft (3), a lifting rod (15) is movably mounted inside the fixing cylinder (14), a ratchet (16) is fixedly mounted on the outside of one side of the transmission shaft (3) close to the fixing cylinder (14), a pawl (17) is fixedly mounted on the bottom end of the transmission shaft (3), and the pawl (17) is movably connected to the ratchet (16).

5. A jack with a protective device according to claim 4, characterized in that: A spring (18) is fixedly mounted on the inner top end of the fixed cylinder (14), and the other end of the spring (18) is fixedly sleeved with the lifting rod (15).

6. The jack with a protective device according to claim 1, characterized in that: The small bevel gear (4) is meshed with the large bevel gear (19).

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