Limiting device for window of ventilation cabinet

Abstract

A ventilation cabinet window limiting device comprises a first limiting assembly fixed to the bottom of a window and a second limiting assembly matched with the first limiting assembly. The first limiting assembly comprises a guide rod, sliding blocks arranged at the two ends of the guide rod, and connecting rods and pressing blocks corresponding to the sliding blocks. The second limiting assembly comprises a limiting block. An operator presses the pressing part of the pressing block, the limiting part of the pressing block slides on the guide inclined surface, so that the two sliding blocks get close to each other to extrude the elastic piece, and the connecting rods fixedly connected with the sliding blocks get close to each other, so that the connecting rods get rid of limitation of the second limiting assembly. The limiting device is simple in operation mode, firm in limiting and low in cost.

Description

Technical Field

[0001] The utility model relates to the field of fume hood parts devices, in particular to a fume hood window limiting device. Background Art

[0002] The fume hood window positioning mechanism is mainly used in domestic high-end and foreign laboratory fume hoods with relatively high safety performance requirements. It is a mechanism used to limit the glass door from exceeding the safe working height. It can not only limit the fume hood window to not exceed a certain safe height, but also can be manually opened when placing large experimental instruments or test objects, and easily pass through when the fume hood window is pulled down from a high place. The fume hood window limit mechanism currently used is generally an electromagnetic device, which is relatively expensive.

[0003] The utility model patent with the authorization announcement number CN203209411U discloses a fume hood window positioning mechanism, including a limit movable block, screws, handrails, handrail fixings and glass fixings. The limit movable block is installed inside the fume hood side panel by screws, and the limit movable block can be swingably penetrated on the screws. The upper part of the limit movable block is triangular in shape, and a positioning hole is opened on the side panel, and one corner of the limit movable block is penetrated for positioning. If the utility model device is only installed on one side of the window, the force on the bottom of the window will be uneven, and the limit will not be firm enough; if it is installed on both sides of the window, two workers need to press the limit movable block at the same time to close the limit device, and the operation method is not simple enough. Summary of the invention

[0004] The problem to be solved by the utility model is to provide a fume hood window limiting device, which has a simple operation mode, reliable limiting and low cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a fume hood window limit device, comprising a first limit assembly and a second limit assembly matching the first limit assembly; the first limit assembly comprises a guide rod, a slider arranged at both ends of the guide rod, and a connecting rod and a pressure block corresponding to the slider, the slider comprises a connecting portion, a fixing portion and a mounting protrusion, the connecting portion and the mounting protrusion are fixed on the fixing portion, the fixing portion is slidably connected to the guide rod, one end of the connecting rod is fixedly connected to the connecting portion, and the other end of the connecting rod cooperates with the second limit assembly, the mounting protrusion is provided with a guide inclined surface, the pressure block comprises a pressing portion and a limiting portion arranged at both ends of the pressing portion, the limiting portion cooperates with the guide inclined surface; the guide rod is provided with an elastic member, and the elastic member is arranged between the two sliders. The use principle of the utility model is that the operator presses the pressing part of the pressing block, and the limiting part of the pressing block slides on the guiding inclined plane, so that the two sliders are moved closer to each other to squeeze the elastic member, and the connecting rod fixedly connected to the sliders also moves closer to each other, so that the connecting rod is freed from the limit of the second limiting assembly.

[0006] As an improvement, the fume hood includes a cabinet body, columns arranged on both sides of the cabinet body and a window arranged between the two columns, the first limiting component is fixed to the middle area at the bottom of the window, and the second limiting component is fixed on the column.

[0007] As an improvement, the limiting portion is L-shaped, comprising a side block and a bottom block, the side block and the pressing portion form a groove, the bottom of the bottom block cooperates with the guide slope, a limiting block is provided on the top of the mounting protrusion, and the top of the bottom block is against the limiting protrusion.

[0008] As an improvement, the connecting portion is fixedly connected to the connecting rod via threads.

[0009] As an improvement, a blocking end is provided on one end of the connecting rod close to the second limiting assembly and is threadedly connected thereto.

[0010] As an improvement, the first limiting assembly further comprises a shell, a cavity is provided inside the shell, the guide rod and the slider are arranged in the cavity, a through hole is provided on the shell, and the lower end of the pressure block extends into the through hole to cooperate with the slider.

[0011] As an improvement, a marking groove is provided on the outer surface of the shell.

[0012] As an improvement, the elastic member is a spring.

[0013] As an improvement, the second limiting assembly includes a limiting block, and a transition slope is provided on the upper portion of the limiting block.

[0014] As an improvement, a limiting protrusion is provided at the bottom of the limiting block, and the limiting protrusion is a soft cushion.

[0015] The beneficial effects of the utility model are as follows: the operator only needs to press the pressing part of the pressing block to control the connecting rods at both ends to move inward, thereby causing the blocking end to lose contact with the limiting protrusion, so that the entire window can continue to move upward. The operation method is simple, the operator can operate alone and the limiting method is reliable; the utility model adopts a mechanical connecting rod mechanism and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the first limiting component.

[0017] Figure 2 It is a three-dimensional schematic diagram of the first limiting component after the housing is hidden.

[0018] Figure 3 This is an exploded view of the first limiting component.

[0019] Figure 4 It is a cross-sectional view of the first limiting component.

[0020] Figure 5 It is a three-dimensional schematic diagram of the utility model installed on a fume hood.

[0021] Figure 6 This is a front view of the utility model installed on a fume hood.

[0022] Figure 7 for Figure 5 Magnified view of area A.

[0023] Figure 8 for Figure 5 Magnified view of area B.

[0024] Explanation of the numbers in the figure: 1. Shell; 11. Identification groove; 2. Pressure block; 21. Side block; 22. Bottom block; 3. Connecting rod; 31. Blocking end; 4. Guide rod; 41. Spring; 5. Slider; 51. Mounting protrusion; 52. Limiting protrusion; 53. Connecting part; 6. Limiting block; 61. Limiting protrusion; 62. Transition slope; 7. Column; 8. Window. Implementation

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings of the specification;

[0026] like Figures 1 to 8As shown, a fume hood window limit device includes a first limit component and a second limit component matched with the first limit component; the fume hood includes a cabinet body, columns 7 arranged on both sides of the cabinet body, and a window 8 arranged between the two columns 7, the first limit component is fixed in the middle area at the bottom of the window 8, the second limit component is fixed on the column 7, and the two columns 7 correspond to two sets of second limit components. The first limit component includes a guide rod 4, two sliders 5, two connecting rods 3 and a pressure block 2 corresponding to the sliders 5, the two sliders 5 are respectively arranged at both ends of the guide rod 4 and are slidably connected to the guide rod 4, and the guide rod 4 is provided with an elastic member, and the elastic member is a spring 41; the slider 5 includes a connecting portion 53, a fixing portion and a mounting protrusion 51, the connecting portion 53 and the mounting protrusion 51 are fixed on the fixing portion, the fixing portion is sleeved on the guide rod 4, a threaded hole is provided on one side of the connecting portion 53, one end of the connecting rod 3 is fixedly connected to the connecting portion 53 by a thread, and the other end of the connecting rod 3 is provided with a threaded fixing thereto. The blocking end 31 connected can be rotated during use to adjust the distance between the blocking end 31 and the connecting rod 3 and the second limiting assembly to a suitable distance; the installation protrusion 51 is provided with a guide slope, the pressing block 2 includes a pressing portion and limiting portions arranged at both ends of the pressing portion, the limiting portion cooperates with the guide slope, the limiting portion includes an L-shape, the limiting portion includes a side block 21 and a bottom block 22, the side block 21 and the pressing portion form a groove, the bottom of the bottom block 22 abuts against the guiding slope, the top of the installation protrusion 51 is provided with a limiting protrusion 52, and the top of the bottom block 22 abuts against the limiting protrusion 52. When the operator presses the pressing portion of the pressing block 2, the limiting protrusion 52 slides downward on the guiding slope, causing the two sliders 5 below the pressing block 2 to move closer to each other, and the connecting rod 3 fixedly connected to the slider 5 also moves closer to the middle, so that the connecting rod 3 loses the match with the second limiting assembly, and the window 8 can continue to move upward. The first limiting component also includes a shell 1, a cavity is provided inside the shell 1, the guide rod 4 and the slider 5 are both arranged in the cavity, a through hole is provided on the shell 1, the lower end of the pressure block 2 extends into the through hole and cooperates with the slider 5, and the shell 1 is fixed in the middle area at the bottom of the window 8, so that the first limiting component is fixed on the window 8; an identification groove 11 is provided on the shell 1, and the manufacturer can add his company's logo or other patterns in the identification groove 11 to promote his own brand or improve the aesthetics of the utility model to attract consumers.

[0027] like Figures 1 to 8As shown, the second limit assembly includes a limit block 6, and a transition slope 62 is provided on the limit block 6. When the connecting rod 3 contracts and contacts the side of the limit block 6, the transition slope 62 makes the connecting rod 3 slide more smoothly on the limit block 6. A limit protrusion 61 is provided at the bottom of the limit block 6. When in use, the limit protrusion 61 contacts the blocking end 31. The limit protrusion 61 is a soft cushion that can buffer the direct impact damage of the blocking end 31 on the limit block 6, thereby protecting the device.

[0028] The operating principle of the utility model is: the user controls the window 8 to move upward, and the blocking end 31 contacts the limiting protrusion 61, and the window 8 stops moving. At this time, if the window 8 needs to continue to move upward, the user presses the pressing part of the pressure block 2, and the limiting part of the pressure block 2 slides downward on the guide inclined surface, and the two sliders 5 slide on the guide rod 4. The two sliders 5 move from the two ends of the guide rod 4 to the middle of the guide rod 4 and squeeze the spring 41. The connecting rod 3 fixedly connected to the slider 5 moves toward the middle, and the blocking end 31 also moves toward the middle and loses contact with the limiting protrusion 61. When the two blocking end heads 31 can pass between the two limiting blocks 6 at the same time, the user stops pressing the pressure block 2, and the blocking end head 31 slides along the transition inclined surface 62 to the top of the limiting block 6, and the window 8 can continue to move.

Claims

1. A fume hood window limit device, characterized in that: The invention comprises a first limiting assembly and a second limiting assembly matching the first limiting assembly; the first limiting assembly comprises a guide rod, sliders arranged at both ends of the guide rod, a connecting rod and a pressing block corresponding to the slider, the slider comprises a connecting portion, a fixing portion and a mounting protrusion, the connecting portion and the mounting protrusion are fixed on the fixing portion, the fixing portion is slidably connected to the guide rod, one end of the connecting rod is fixedly connected to the connecting portion, the other end of the connecting rod cooperates with the second limiting assembly, the mounting protrusion is provided with a guiding inclined surface, the pressing block comprises a pressing portion and limiting portions arranged at both ends of the pressing portion, the limiting portions cooperate with the guiding inclined surfaces; An elastic member is arranged on the guide rod, and the elastic member is arranged between two sliding blocks.

2. The fume hood window limiting device according to claim 1, characterized in that: The fume hood comprises a cabinet body, columns arranged on both sides of the cabinet body and a window arranged between the two columns. The first limiting component is fixed to the middle area of ​​the bottom of the window, and the second limiting component is fixed on the column.

3. The fume hood window limiting device according to claim 1, characterized in that: The limiting portion is L-shaped and includes a side block and a bottom block. The side block and the pressing portion form a groove. The bottom of the bottom block cooperates with the guiding inclined surface. A limiting block is provided on the top of the mounting block, and the top of the bottom block abuts against the limiting block.

4. The fume hood window limiting device according to claim 1, characterized in that: The connecting portion is fixedly connected to the connecting rod via threads.

5. The fume hood window limiting device according to claim 1, characterized in that: A blocking end is provided on one end of the connecting rod close to the second limiting assembly and is threadedly connected thereto.

6. The fume hood window limiting device according to claim 1, characterized in that: The first limiting assembly also includes a shell, a cavity is provided inside the shell, the guide rod and the slider are arranged in the cavity, a through hole is provided on the shell, and the lower end of the pressing block extends into the through hole to cooperate with the slider.

7. The fume hood window limiting device according to claim 6, characterized in that: An identification groove is arranged on the outer surface of the shell.

8. The fume hood window limiting device according to claim 1, characterized in that: The elastic member is a spring.

9. The fume hood window limiting device according to claim 1, characterized in that: The second limiting assembly comprises a limiting block, and a transition slope is arranged on the upper portion of the limiting block.

10. The fume hood window limiting device according to claim 9, characterized in that: A limiting protrusion is provided at the bottom of the limiting block, and the limiting protrusion is a soft cushion.

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