Measuring device for masonry construction

Abstract

The invention relates to the technical field of building construction measurement, and particularly discloses a masonry construction measuring device which comprises a base, one end of the top of the base is provided with a story number plate, an inner cavity of the story number plate is provided with a through groove, two sides of an inner cavity of the through groove are provided with sliding grooves, two sides of the front side of the story number plate are provided with scale marks, and the story number plate is provided with an adjusting assembly. The adjusting assembly comprises guide blocks, the guide blocks are located in inner cavities of the through grooves, guide blocks matched with the guide grooves are arranged on the two sides of each guide block, and pointers are arranged at one ends of the guide blocks and located on the front face of the story number plate. The height number plate structure with the adjustable assembly is arranged and matched with the threaded transmission mechanism of the threaded rod and the threaded sleeve, so that accurate positioning of measurement mark points is achieved, and the problem that a traditional fixed scale height number rod cannot adapt to parameter adjustment is solved; the measuring device has the advantages of flexibly adjusting measuring parameters according to actual construction requirements, reducing the replacement frequency of scale tools, and improving the construction efficiency and the stability of the measuring device.

Description

Technical Field

[0001] This invention relates to the field of building construction measurement technology, specifically a measuring device for masonry construction. Background Technology

[0002] In masonry construction, bricklaying gauges serve as crucial measuring tools, primarily used to control brick layer thickness and mortar joint uniformity. Traditional gauges typically employ a wooden structure, guiding construction through fixed-interval markings on their surface. Each pair of markings constitutes a standard masonry unit, corresponding to brick thickness and mortar joint thickness, respectively. This fixed-marker design has significant drawbacks: when adjustments to masonry parameters are needed or special construction requirements arise, the non-adjustable markings necessitate replacing gauges of different specifications, increasing costs and severely impacting efficiency. The limitations of fixed gauges are particularly pronounced in complex projects requiring frequent adjustments to masonry parameters, often necessitating the preparation of multiple sets of different gauges on-site, consuming storage space and increasing management complexity. Furthermore, traditional gauges suffer from poor installation stability, easily shifting under external forces, affecting measurement accuracy. Therefore, improvements to existing technologies are urgently needed to address these issues. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a measuring device for masonry construction, which has the advantages of flexibly adjusting measuring parameters according to actual construction needs, reducing the frequency of ruler tool replacement, improving construction efficiency, and enhancing the stability of the measuring device.

[0004] This application provides a measuring device for masonry construction, the technical solution of which is as follows: The device includes a base, with a measuring plate at one top end. The measuring plate has a through groove in its inner cavity, and sliding grooves on both sides of the through groove. Scale lines are provided on both sides of the front of the measuring plate. An adjustment assembly is provided on the measuring plate, including a guide block located in the inner cavity of the through groove. Guide blocks that match the guide grooves are provided on both sides of the guide block. A pointer is provided at one end of the guide block and is located on the front of the measuring plate. A screw is provided at the other end of the guide block, and a threaded sleeve is connected to the surface of the screw. One side of the threaded sleeve is in close contact with the measuring plate.

[0005] Furthermore, this application also proposes that the number of adjustment components is not less than six, and that the six adjustment components can be adjusted in position on the scale plate according to the scale lines.

[0006] Furthermore, this application also proposes that the connection between the two sides of the guide block and the slider is fixed by welding, and the surface of the slider is in close contact with the groove.

[0007] Furthermore, this application also proposes that support frames are fixedly connected to both sides of the back of the cardboard, and the other end of the support frame is fixedly connected to the base.

[0008] Furthermore, this application also proposes that a water tank is provided at the other end of the top of the base, with a water inlet at the top of the water tank and a drain outlet at the bottom of one end of the water tank.

[0009] Furthermore, this application also proposes that positioning cone rods are fitted on both sides of one end of the base cavity, and the two positioning cone rods are arranged symmetrically about the base.

[0010] Furthermore, this application also proposes that a pump is fixedly connected to the side of the water tank, the input end of the pump is connected to the bottom of the outside of the water tank through an inlet pipe, and the output end of the pump is connected to a nozzle through an outlet pipe.

[0011] Furthermore, this application also proposes that a motor is fixedly connected to one end of the top of the water tank, the output shaft of the motor is fixedly connected to an electric telescopic rod, and the nozzle is fixedly connected to the top of the telescopic end of the electric telescopic rod.

[0012] As can be seen from the above, the measuring device and its adjustment components for masonry construction provided in this application achieve precise positioning of measurement markers by setting a caliper plate structure with adjustable components and cooperating with a threaded transmission mechanism of screw and screw sleeve. This solves the problem that traditional fixed-scale caliper rods cannot adapt to parameter adjustments. It has the advantages of flexibly adjusting measurement parameters according to actual construction needs, reducing the frequency of ruler tool replacement, improving construction efficiency and the stability of the measuring device. When the pump is turned on, water in the water tank can be transported to the water outlet pipe through the inlet pipe and finally sprayed out from the nozzle. During this process, people can control the motor to rotate as needed, which can drive the electric telescopic rod to rotate horizontally. Controlling the extension and retraction of the electric telescopic rod can drive the nozzle to move up and down, thereby achieving the purpose of automatic spraying and curing of masonry. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the chute structure of the present invention; Figure 3 This is a schematic diagram of the adjustment component structure of the present invention.

[0014] In the diagram: 1. Base; 2. Positioning cone rod; 3. Water tank; 4. Support frame; 5. Marker plate; 6. Scale line; 7. Through groove; 8. Adjustment component; 801. Guide block; 802. Pointer; 803. Screw sleeve; 804. Screw; 805. Slider; 9. Slide groove; 10. Pump; 11. Motor; 12. Electric telescopic rod; 13. Nozzle; 14. Water outlet pipe; 15. Water inlet pipe. Detailed Implementation

[0015] The following drawings disclose several embodiments of the present invention. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0016] Please see Figure 1-3 In existing technologies, bricklaying gauges, used as measuring tools in masonry construction, are typically wooden gauges with fixed graduations. Traditional bricklaying gauges have graduations arranged at fixed intervals, with each interval corresponding to the thickness of the brick and mortar joint. Because the graduations are not adjustable, when different intervals are needed during construction, the corresponding bricklaying gauge must be replaced, leading to reduced construction efficiency and increased tool management costs. For example, in scenarios requiring adjustments to mortar joint thickness or brick specifications, operators need to frequently change the bricklaying gauge, affecting the continuity of construction.

[0017] To address the aforementioned issues, the key is to achieve flexible adjustment of the gauge mark 6. Traditional fixed scales cannot meet diverse construction needs. If a movable indicator structure can be designed on the gauge, its position can be adjusted to adapt to different spacing requirements. Based on this, we explored a combination of a sliding component and a threaded adjustment mechanism, enabling operators to quickly position the pointer 802 to the desired gauge mark 6, thereby avoiding the need to replace the entire gauge.

[0018] Therefore, this application proposes a measuring device including a base 1 and a scale plate 5. The scale plate 5 is fixed to the top of the base 1, and has a through groove 7 inside. Slide grooves 9 are provided on both sides of the through groove 7, and scale lines 6 are provided on both sides of the front. The adjustment assembly 8 includes a guide block 801. Slide blocks 805 that cooperate with slide grooves 9 are provided on both sides of the guide block 801. One end of the guide block 801 is connected to a pointer 802, and the other end is connected to a screw 804. A threaded sleeve 803 is connected to the surface of the screw 804, and the screw sleeve 803 contacts the scale plate 5.

[0019] The guide block 801 is a component that slides within the through groove 7. It can be made of metal or plastic and is guided by sliders 805 on both sides embedded in the sliding groove 9. Its function is to provide a stable sliding path for the pointer 802. The sliding groove 9 is a recess formed in the inner wall of the through groove 7. It can be a linear track structure and is used to limit the movement direction of the guide block 801, ensuring the pointer 802 is accurately displaced along the scale line 6. The screw 804 is a threaded rod connected to the guide block 801. It can be made of stainless steel. Rotating the screw sleeve 803 drives the screw 804 to move axially, thereby adjusting the position of the guide block 801 and the pointer 802. The screw sleeve 803 is a nut structure that mates with the screw 804. It can be a sleeve with external threads. Tightening the screw sleeve 803 generates the threaded pair movement, achieving fine-tuning and positioning of the guide block 801. The pointer 802 is an indicator component fixed to the front of the guide block 801. It can be an arrow-shaped metal piece used to align with the scale line 6 to display the current adjustment position.

[0020] Specifically, the bricklaying plate 5 is fixed to the base 1 by the support frame 4, and the guide block 801 in the through groove 7 slides along the slide groove 9 via the slider 805. When it is necessary to adjust the position of the pointer 802, the rotating screw sleeve 803 drives the screw 804 to move the guide block 801, and the pointer 802 is moved to the target position along the scale line 6. Through the independent operation of multiple adjustment components 8, multiple adjustable marking points can be set on the same bricklaying plate 5 to adapt to different masonry layer heights or mortar joint thickness requirements. The cooperation between the guide block 801 and the slide groove 9 ensures the movement accuracy, while the threaded adjustment mechanism provides a stable locking function to prevent the pointer 802 from accidentally deviating during construction.

[0021] Compared to existing technologies, the scale lines 6 of traditional gauge rods are fixed and cannot be adjusted. This solution, however, allows for free adjustment of the pointer 802 position through a sliding adjustment component 8. Operators do not need to replace the entire gauge rod; they can quickly change the marking position simply by tightening the threaded sleeve 803, significantly improving construction flexibility and tool reusability. Furthermore, the threaded adjustment mechanism enhances structural stability while maintaining accuracy, avoiding the problem of loosening common in traditional marking tools.

[0022] Through the above technical solution, this application solves the problem of low construction efficiency caused by the non-adjustable scale of traditional bricklaying gauges, and achieves flexible adaptation of the masonry ruler. Operators can adjust the positions of multiple pointers 802 according to actual needs to accurately control the thickness of bricks and mortar joints, while reducing the frequency of tool replacement and improving construction convenience.

[0023] This application further proposes that the number of adjustment components 8 is not less than six, and the six adjustment components 8 can be adjusted in position on the scale plate 5 according to the scale line 6.

[0024] The adjustment component 8 refers to a movable positioning structure composed of a guide block 801, a pointer 802, a screw 804, and a threaded sleeve 803. Specifically, it can be achieved by sliding the guide block 801 with the slide groove 9 and threading the screw 804 with the threaded sleeve 803. Rotating the threaded sleeve 803 drives the guide block 801 to move along the slide groove 9, causing the pointer 802 to correspond to the scale line 6. The six adjustment components 8 refer to at least six independent adjustment units, specifically achieved by evenly distributing multiple guide blocks 801 within the through-slot 7 of the brick counter 5. Their function is to provide multiple adjustable positioning points for different masonry layers. The adjustment of the scale line 6 refers to aligning the pointer 802 of the adjustment component 8 with the scale line 6 on the front of the brick counter 5 according to the masonry construction requirements. Specifically, this is achieved by sliding the guide block 801 to make the pointer 802 point to the target scale value. Its function is to provide a variable reference for mortar joint thickness and brick arrangement.

[0025] Specifically, the six adjusting components 8 installed in the groove 7 of the brick leveling board 5 can move freely along the slide 9. By rotating the screw sleeve 803, the guide block 801 is driven to move the pointer 802, so that each pointer 802 is precisely aligned with the scale line 6 on the front of the brick leveling board 5. During construction, according to the brick layer height required by the design drawings, the six adjusting components 8 are adjusted to the corresponding scale positions to form multiple sets of customizable positioning references. When it is necessary to change the mortar joint or brick thickness, only the position of the corresponding adjusting component 8 needs to be readjusted, without replacing the brick leveling board 5, to adapt to different construction needs.

[0026] Compared to existing technologies, the traditional bricklaying gauge has fixed graduation lines (6), which cannot be adjusted according to actual working conditions, requiring the entire gauge to be replaced for each different masonry specification. This solution, however, uses six independently adjustable components, allowing the same gauge plate (5) to quickly adapt to various masonry parameters, eliminating the tedious operation of frequently changing the gauge.

[0027] Through the above technical solution, this application solves the problem of limited applicability caused by the fixed brick gauge marking. Construction personnel can flexibly adjust the position of the six adjustment components 8 according to the needs of the site, so that they can accurately correspond to the thickness requirements of different brick layers and mortar joints, achieve the effect of one board for multiple uses, and significantly improve the efficiency and convenience of masonry construction.

[0028] This application further proposes that the connection between the two sides of the guide block 801 and the slider 805 is fixed by welding, and the surface of the slider 805 is in close contact with the groove 9.

[0029] Among them, the guide block 801 refers to the moving part in the adjustment component 8 that cooperates with the slide groove 9. Specifically, it can be made by machining a metal block and is used to drive the pointer 802 to move along the surface of the dial plate 5.

[0030] The slider 805 refers to the sliding component set on both sides of the guide block 801. Specifically, it can be implemented by a protruding structure that matches the shape of the groove 9, which is used to limit the movement trajectory of the guide block 801 in the groove 9.

[0031] Among them, the welding-type fixed connection refers to the combination of guide block 801 and slider 805 by high-temperature molten metal material. Specifically, it can be achieved by electric arc welding or laser welding process, which can provide a stable mechanical connection strength.

[0032] The tight contact of the slide groove 9 refers to the gapless fit between the surface of the slider 805 and the inner wall of the slide groove 9. This can be achieved through machining tolerance control to reduce offset or shaking during the sliding process.

[0033] Specifically, the guide block 801 is rigidly connected to the slider 805 on both sides by welding. The welding process eliminates the risk of relative displacement between the guide block 801 and the slider 805. When the slider 805 is embedded in the groove 9, its surface remains in close contact with the inner wall of the groove 9. During the movement of the adjusting component 8 along the dial plate 5, the sliding trajectory of the slider 805 is strictly limited within the range of the groove 9, thereby preventing the guide block 801 from tilting or getting stuck due to external forces. The welded connection can withstand the mechanical stress generated by repeated adjustments, while the tightly contacting structure of the slider 805 and the groove 9 ensures the stability of the adjusting component 8 during movement.

[0034] Compared with existing technologies, traditional dial gauge adjustment components are mostly fixed with bolts or adhesive, which are prone to loosening due to vibration or frequent adjustment. This solution eliminates the reliability defects of traditional connection methods by welding the guide block 801 and the slider 805 together; at the same time, the tight contact design between the slider 805 and the groove 9 reduces sliding friction resistance and extends the service life of the adjustment component 8.

[0035] Through the above technical solution, this application achieves a stable connection between the guide block 801 and the slider 805, avoiding the problem of pointer 802 offset due to component loosening during adjustment, and ensuring the positioning accuracy of the measurement mark. The use of welding process reduces maintenance frequency, while the cooperative design of slider 805 and slide groove 9 improves the smoothness of adjustment operation, ultimately improving the efficiency of masonry construction measurement.

[0036] This application further proposes that both sides of the back of the cardboard 5 are fixedly connected to support frames 4, and the other end of the support frame 4 is fixedly connected to the base 1.

[0037] Among them, the support frame 4 refers to the rigid connection structure set between the counting plate 5 and the base 1. Specifically, it can be implemented by metal rods or high-strength plastic frames, which are used to disperse the lateral force on the counting plate 5 and enhance the stability of the overall structure.

[0038] Among them, the fixed connection refers to the combination of the support frame 4 with the leather plate 5 and the base 1 through a non-removable or adjustable mechanical connection method. Specifically, it can be achieved by welding, bolt fastening or one-piece molding process to ensure that the support frame 4 does not shift or loosen during construction.

[0039] Specifically, the two ends of the support frame 4 are fixedly connected to the back of the measuring plate 5 and the base 1, respectively, forming a triangular or trapezoidal support structure. The measuring plate 5 is firmly fixed to the base 1 by the support frames 4 on both sides, preventing the measuring plate 5 from tilting or shaking due to external forces. During construction, the support frame 4 uses its rigidity to transfer the vertical load of the measuring plate 5 to the base 1, thereby maintaining the stability of the measuring device.

[0040] Compared to existing technologies, traditional measuring rods are typically erected directly on the ground or temporary supports, lacking a rigid connection structure with the base 1, making them prone to displacement due to collisions or vibrations. This solution, however, uses a support frame 4 to form an integral frame structure between the measuring plate 5 and the base 1, significantly improving the measuring device's anti-interference capability and long-term stability.

[0041] Through the above technical solution, this application solves the problem of decreased measurement accuracy caused by the lack of reliable support structure in traditional bricklaying rods, ensures that the bricklaying board 5 remains vertical and stable during construction, reduces repeated adjustment operations caused by device displacement, and thus improves the efficiency of masonry construction.

[0042] This application further proposes that a water tank 3 be provided at the other end of the top of the base 1, with a water inlet at the top of the water tank 3 and a drain outlet at the bottom of one end of the water tank 3.

[0043] Among them, water tank 3 refers to a container used to store liquid counterweight. Specifically, it can be implemented by a metal box with a sealed lid. Its internal space can hold liquid substances to increase the overall mass of base 1.

[0044] The inlet refers to the water injection channel located on the top of the water storage tank. Specifically, it can be implemented using a tubular structure with a threaded sealing cap, which facilitates the injection of liquid from an external water source.

[0045] The outlet refers to the liquid discharge channel located at the bottom of the water storage tank. Specifically, it can be implemented using metal pipe fittings with valves, and the liquid discharge volume can be controlled by opening and closing the valves.

[0046] Specifically, when the construction site has a slope or soft soil, an appropriate amount of liquid, such as water, can be injected into the water tank 3 through the inlet to provide sufficient stability to the base 1. When it is necessary to move the device, the liquid can be drained by opening the outlet valve to reduce weight. The top inlet and bottom outlet of the water tank form a gravity-fed structure, which can complete the counterweight adjustment without the need for external power.

[0047] Compared to existing technologies, traditional fixed counterweights cannot adjust their weight according to construction conditions, while this solution achieves dynamic counterweighting through liquid storage and transportation. Existing technologies using precast concrete blocks as counterweights suffer from low transportation and dismantling efficiency, while this solution makes the device easier to handle through its liquid discharge function.

[0048] Through the above technical solution, this application solves the problem of insufficient stability of traditional masonry measuring devices in complex terrain, while avoiding the transportation difficulties caused by fixed counterweights. The adjustable characteristics of the liquid counterweight allow the device to adapt to the larger self-weight required for soft ground, and to quickly reduce the load during transfer, thereby improving construction efficiency.

[0049] This application further proposes that positioning cone rods 2 are fitted on both sides of one end of the inner cavity of the base 1, and the two positioning cone rods 2 are arranged symmetrically about the base 1.

[0050] The positioning cone 2 refers to a rod-shaped component that can be inserted into the ground to provide anchorage. Specifically, it can be implemented using a metal rod with a tapered tip, and its sleeve structure allows for adjustment of the insertion depth based on the ground hardness. This design enhances the connection stability between the measuring device and the ground through active fixing.

[0051] The centrally symmetrical arrangement refers to the fact that the axes of the two positioning cone rods 2 are mirror-symmetrically distributed with respect to the longitudinal centerline of the base 1. This can be achieved through mounting holes that are equidistantly distributed on both sides of the base 1. This layout ensures that the device maintains torque balance when subjected to external forces, preventing overturning due to unilateral force.

[0052] Specifically, when the device is deployed on soft ground, the positioning cone 2 can be vertically inserted into the ground to form an anchor point; in hard ground scenarios, the friction generated by the contact between the cone tip and the ground can assist in the device's positioning. The symmetrically distributed cones form a four-point support structure at both ends of the base 1, working in conjunction with the water tank 3 to ensure that the device remains horizontal even in the vibration environment of masonry construction. For example, when the operator adjusts the guide block 801 on the measuring plate 5, the base 1 counteracts the operational reaction force through the anchoring effect of the cones, ensuring that the measurement reference does not shift.

[0053] Compared to existing technologies, traditional caliper pole devices rely heavily on the weight of the base 1 for stability, making them prone to slippage on slopes or loose foundations. This solution, through the actively anchored positioning cone 2, enables the device to achieve reliable fixation without relying on ground flatness, making it particularly suitable for complex terrain conditions at field construction sites.

[0054] Through the above technical solution, this application effectively solves the problem of insufficient stability of traditional measuring devices under non-ideal ground conditions. The symmetrical anchoring effect of the positioning cone rod 2 enables the device to resist external force interference during masonry operations, ensuring the accuracy of the scale reference of the katakana plate 5, while simplifying the equipment deployment process. The operator only needs to press down the cone rod to complete the quick fixation.

[0055] A pump 10 is fixedly connected to the side of the water tank 3. The input end of the pump 10 is connected to the bottom of the outside of the water tank 3 through the water inlet pipe 15, and the output end of the pump 10 is connected to the nozzle 13 through the water outlet pipe 14.

[0056] A motor 11 is fixedly connected to one end of the top of the water tank 3. The output shaft of the motor 11 is fixedly connected to an electric telescopic rod 12, and the nozzle 13 is fixedly connected to the top of the telescopic end of the electric telescopic rod 12.

[0057] Specifically, when the pump 10 is turned on, the water in the water tank 3 can be transported to the water outlet pipe 14 through the inlet pipe 15 and finally sprayed out from the nozzle 13. During this process, people can control the motor 11 to rotate as needed, which can drive the electric telescopic rod 12 to rotate horizontally. Controlling the extension and retraction of the electric telescopic rod 12 can drive the nozzle 13 to move up and down, thereby achieving the purpose of automatic spraying and curing of masonry.

[0058] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A measuring device for masonry construction comprising a base (1), characterised in that: One end of the top of the base (1) is provided with a skin number plate (5), the inner cavity of the skin number plate (5) is provided with a through slot (7), both sides of the inner cavity of the through slot (7) are provided with a sliding groove (9), both sides of the front of the skin number plate (5) are provided with a scale line (6), the skin number plate (5) is provided with an adjusting assembly (8), the adjusting assembly (8) comprises a guide block (801), and the guide block (801) is located in the inner cavity of the through slot (7), both sides of the guide block (801) are provided with a guide block (801) matched with the guide groove, one end of the guide block (801) is provided with a pointer (802), and the pointer (802) is located on the front of the skin number plate (5), the other end of the guide block (801) is provided with a screw rod (804), and the surface of the screw rod (804) is threadedly connected with a screw sleeve (803), one side of the screw sleeve (803) is in close contact with the skin number plate (5).

2. The measuring device for masonry construction according to claim 1, characterized in that: The number of the adjusting assembly (8) is not less than six, and the six adjusting assemblies (8) can be adjusted on the skin number plate (5) according to the scale line (6).

3. The measuring device for masonry construction of claim 1, wherein: Both sides of the guide block (801) and the connecting part of the sliding block (805) are fixedly connected through welding, and the surface of the sliding block (805) is in close contact with the sliding groove (9).

4. The measuring device for masonry construction of claim 1, wherein: Both sides of the back of the skin number plate (5) are fixedly connected with support frames (4), and the other end of the support frame (4) is fixedly connected with the base (1).

5. The measuring device for masonry construction of claim 1, wherein: The other end of the top of the base (1) is provided with a water tank (3), the top of the water tank (3) is provided with a water inlet, and the bottom of one end of the water tank (3) is provided with a discharge port.

6. The measuring device for masonry construction of claim 1, wherein: Both sides of one end of the inner cavity of the base (1) are sleeved with positioning taper rods (2), and the two positioning taper rods (2) are centrally symmetrically arranged about the base (1).

7. The measuring device for masonry construction of claim 1, wherein: The side of the water tank (3) is fixedly connected with a pump (10), the input end of the pump (10) is communicated with the bottom of the outside of the water tank (3) through a water inlet pipe (15), and the output end of the pump (10) is communicated with a spray head (13) through a water outlet pipe (14).

8. The measuring device for masonry construction of claim 7, wherein: One end of the top of the water tank (3) is fixedly connected with a motor (11), the output shaft of the motor (11) is fixedly connected with an electric telescopic rod (12), and the spray head (13) is fixedly connected to the top of the telescopic end of the electric telescopic rod (12).

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