A brick outer wall mortar joint retaining rod

Abstract

The utility model provides a kind of block outer wall mortar joint indwelling rod.Solve the problem that traditional block wall joint cleaning process needs to wait for mortar final setting to be able to construction.In the utility model, self-adjusting indwelling part is arranged between first block, second block and third block, first block and second block form first mortar joint, second block and third block define second mortar joint, one end of self-adjusting indwelling part is arranged in first gap, the other end of self-adjusting indwelling part is arranged in second gap, middle part of self-adjusting indwelling part is attached to the upper end face edge of second block;Self-adjusting indwelling part includes transverse mortar joint indwelling rod, two universal joints and two longitudinal mortar joint indwelling rods, two universal joints are respectively arranged at the both ends of transverse mortar joint indwelling rod, one longitudinal mortar joint indwelling rod is respectively hinged on each universal joint, transverse mortar joint indwelling rod includes transverse main indwelling rod, transverse U-shaped indwelling frame, strip magnet one and strip iron block one, transverse main indwelling rod is arranged in transverse U-shaped indwelling frame.

Description

Technical Field

[0001] This utility model specifically relates to a mortar joint retention rod for masonry exterior walls, belonging to the field of building renovation. Background Technology

[0002] In the industry, the process of "cleaning out a neat and uniform concave joint" after the completion of a masonry exterior wall is called grouting or joint cleaning. Its purpose is not only aesthetics, but also has a triple function of structure, craftsmanship, and durability: The depth of the concave joint is usually controlled at 5-8 mm, which can form a mechanical interlock, making the subsequent grout or waterproof coating more firmly embedded, reducing the hollowing and falling off caused by thermal expansion and contraction, while preventing rainwater from forming a water film on the wall surface, blocking capillary seepage channels, and reducing the risk of leakage; After cleaning, white cement, colored mortar, or special grout is uniformly embedded, with straight lines and consistent depth, which significantly enhances the decorative effect of the brick texture. If it is directly smoothed, the mortar joint will be mottled in color and uneven in thickness, making it look dirty and messy from a distance; In addition, a neat concave joint facilitates future local repairs or regrouting. Only a small piece of grout needs to be removed to replace the damaged brick, without damaging a large area of ​​the wall surface. It also provides a uniform reference surface for subsequent processes such as exterior wall cleaning, spraying waterproofing agents or stone paint.

[0003] Currently, the industry generally follows the traditional process of "waiting for the mortar to fully set after the entire wall is built, and then performing secondary cleaning and grouting." This practice has been accepted by current standards such as the "Code for Acceptance of Construction Quality of Masonry Structures" GB 50203 and the "Code for Acceptance of Construction Quality of Building Decoration and Renovation Engineering" GB 50210. The specific procedures are as follows: the masonry workers first fill the mortar joints with a trowel and smooth them; after the mortar has fully set (usually 24-72 hours) and reached a strength of M5-M10, another team uses an angle grinder with a diamond cutting tool or an electric hammer with a flat chisel to mechanically chisel out grooves 5-8 mm deep; then the loose dust is cleaned, the surface is moistened with water, and finally, a special grouting agent or mortar is used to complete the grouting; if the external scaffolding has been removed, a suspended platform or mobile platform needs to be erected again for high-altitude work.

[0004] Extensive engineering practice and field surveys have shown that this "post-grouting" process has significant drawbacks: The mortar has high strength after final setting, requiring high-noise, high-dust mechanical chiseling, resulting in low efficiency and a tendency for edges and corners to chip; manual chiseling results in inconsistent depths, leading to "wavy" grout joints that fail to meet the aesthetic requirements of straight lines in fair-faced brick curtain walls; the laitance sets and bonds after two or three days on the brick surface, requiring a wire brush and water rinsing, which easily causes "tears" of contamination and efflorescence; the surface of the final-set mortar is carbonized and covered with dust, making it difficult for grouting materials to penetrate, resulting in 1-2... After the New Year, the probability of hollow spots and detachment increases significantly; after the external scaffolding is dismantled, a second suspended platform needs to be erected, doubling the cost of machinery and labor. Construction is impossible when the exterior walls are wet during the rainy season, directly delaying the construction period; defects such as incomplete mortar and blind joints are covered by subsequent plastering or insulation layers, making it difficult to detect leakage risks during process inspection; the time of the masonry team and the grouting team are not coordinated, and the responsibility interface is unclear, leading to mutual blame when quality problems occur, which is not conducive to the whole process quality control. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a mortar joint retaining rod for masonry exterior walls is provided to solve the above problems.

[0006] A mortar joint retaining rod for a masonry exterior wall includes a self-adjusting retaining member. The self-adjusting retaining member is disposed between a first masonry block, a second masonry block, and a third masonry block. A first mortar joint is formed between the first masonry block and the second masonry block, and a second mortar joint is defined between the second masonry block and the third masonry block. One end of the self-adjusting retaining member is disposed in the first mortar joint, and the other end of the self-adjusting retaining member is disposed in the second mortar joint. The middle part of the self-adjusting retaining member is attached to the edge of the upper end face of the second masonry block. The self-adjusting retainer includes a transverse mortar joint retainer rod, two universal joints, and two longitudinal mortar joint retainer rods. A universal joint is passed through each end of the transverse mortar joint retainer rod, and a longitudinal mortar joint retainer rod is hinged to each universal joint.

[0007] As a preferred embodiment: the transverse mortar joint retaining rod includes a transverse main retaining rod, a transverse U-shaped retaining frame, a bar magnet, and a bar iron block. The transverse main retaining rod is inserted into the transverse U-shaped retaining frame. Both ends of the transverse main retaining rod are respectively machined with telescopic blind holes. A universal joint is telescopically inserted into each telescopic blind hole. A strip groove is machined along the length of one side of the outer wall of the transverse main retaining rod. A bar magnet is installed in the strip groove. A bar iron block is installed along the length of the inner wall of the transverse U-shaped retaining frame. The bar iron block is inserted into the strip groove and magnetically attracted to the bar magnet.

[0008] As a preferred embodiment: Each universal joint includes a hinge joint, a hinge rod, a telescopic rod, a blocking plate, and an elastic element. A telescopic rod is inserted into the telescopic blind hole. A longitudinal mortar joint retention rod is hinged to the lower end of the hinge joint. A notch is machined on the hinge joint along its thickness direction. One end of the hinge rod is hinged to the notch. The other end of the hinge rod is fixedly connected to one end of the telescopic rod. A blocking plate is provided at the other end of the telescopic rod. The elastic element is fitted onto the telescopic rod. One end of the elastic element abuts against the blocking plate, and the other end of the elastic element abuts against the inner wall of the telescopic blind hole.

[0009] As a preferred embodiment: each longitudinal mortar joint retaining rod includes a longitudinal main retaining rod, an operating pull rod, a longitudinal U-shaped retaining frame, two bar magnets, and two bar iron blocks. The lower end of the hinge joint is hinged to the upper end of the longitudinal main retaining rod. The longitudinal main retaining rod passes through the longitudinal U-shaped retaining frame. An operating pull rod is provided at the lower end of the longitudinal main retaining rod. A bar groove is machined along the length of the side wall of the longitudinal main retaining rod. A bar magnet is provided in the bar groove. The bar iron block passes through the bar groove. The bar magnet and the bar iron block are magnetically attracted to each other.

[0010] As a preferred embodiment, an additional bar magnet is also provided inside the bar groove, which magnetically attracts the first bar magnet and the first bar iron block.

[0011] The beneficial effects of this utility model are as follows: By using the three-way positioning of the longitudinal and transverse mortar joint rods, the rotation and removal of the universal joint, and the continuous rotation of both, this device allows the longitudinal and transverse mortar joints of the block wall to be formed in one step before the mortar initially sets. This eliminates the need for secondary processes such as waiting, angle grinder cutting, and electric hammer chiseling required by traditional "post-setting chiseling". It also eliminates common quality problems such as chipped edges, dust and noise, and inconsistent joint depth. The depth and straightness of the mortar joints always maintain the design values. At the same time, the three steps of masonry, positioning, and removal are completed simultaneously, without the need for secondary scaffolding or suspended platforms. This facilitates refined construction quality and achieves a continuous, standardized, and uniform operation process for leaving joints as the masonry works on the exposed brick wall. Attached Figure Description

[0012] Figure 1 This is a schematic diagram showing the usage of the first block, second block, and third block of this utility model; Figure 2 This is a three-dimensional structural diagram of the present invention in its first usage configuration. Figure 3 This is a three-dimensional structural diagram of the present invention in its second usage configuration. Figure 4 A three-dimensional structural diagram of the horizontal mortar joint retaining rod; Figure 5 This is a schematic diagram of the three-dimensional structure of the first strip of iron. Figure 6 A schematic diagram of the cross-sectional structure of the additional bar magnet, the transverse main retaining rod, and the first bar magnet; Figure 7 This is a schematic diagram of the three-dimensional structure of a universal joint; Figure 8 A three-dimensional structural diagram of the longitudinal mortar joint retaining rod; Figure 9 A three-dimensional structural diagram of a longitudinal U-shaped indwelling frame; Figure 10 This is a schematic diagram of the half-section three-dimensional structure of the transverse main retaining rod.

[0013] In the diagram: 1-First block; 2-Second block; 3-Third block; 4-Self-adjusting retaining element; 5-First mortar joint; 6-Second mortar joint; 4-1-Transverse mortar joint retaining rod; 4-11-Transverse main retaining rod; 4-111-Expansion blind hole; 4-112-Strip groove one; 4-12-Transverse U-shaped retaining frame; 4-13-Strip magnet one; 4-14-Strip iron block one; 4-2-Universal joint; 4-21-Hinge Head; 4-211-Notch; 4-22-Hinged rod; 4-23-Telescopic rod; 4-24-Blocking plate; 4-25-Elastic element; 4-3-Longitudinal mortar joint retention rod; 4-31-Longitudinal main retention rod; 4-311-Strip groove two; 4-32-Operating pull rod; 4-33-Longitudinal U-shaped retention frame; 4-34-Strip magnet two; 4-35-Strip iron block two; 8-Additional strip magnet; 7-Demonstration block. Detailed Implementation

[0014] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0015] Specific implementation method one: Combining Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10This embodiment describes a mortar joint retaining rod for the exterior wall of a masonry block, which includes a first masonry block 1, a second masonry block 2, a third masonry block 3, and a self-adjusting retaining member 4. A first mortar joint 5 is formed between the first masonry block 1 and the second masonry block 2, and a second mortar joint 6 is defined between the second masonry block 2 and the third masonry block 3. One end of the self-adjusting retaining member 4 is disposed in the first mortar joint 5, and the other end of the self-adjusting retaining member 4 is disposed in the second mortar joint 6. The middle part of the self-adjusting retaining member 4 is attached to the edge of the upper end face of the second masonry block 2. The self-adjusting retaining component 4 includes a transverse mortar joint retaining rod 4-1, two universal joints 4-2 and two longitudinal mortar joint retaining rods 4-3. A universal joint 4-2 is passed through each end of the transverse mortar joint retaining rod 4-1, and a longitudinal mortar joint retaining rod 4-3 is hinged to each universal joint 4-2.

[0016] Insert the right longitudinal mortar joint retaining rod 4-3 into the first mortar joint 5, insert the left longitudinal mortar joint retaining rod 4-3 into the second mortar joint 6, and make the transverse mortar joint retaining rod 4-1 close to the upper edge of the second block 2 to form a three-way positioning of the mortar joint space; the mortar maintains the predetermined thickness and shape under the constraint of the self-adjusting retaining member 4.

[0017] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One. The transverse mortar joint retaining rod 4-1 includes a transverse main retaining rod 4-11, a transverse U-shaped retaining frame 4-12, a bar magnet 4-13, and a bar iron block 4-14. The transverse main retaining rod 4-11 passes through the transverse U-shaped retaining frame 4-12. Telescopic blind holes 4-111 are machined at both ends of the transverse main retaining rod 4-111. Each telescopic blind hole 4-111 contains... A retractable universal joint 4-2 is provided. A strip groove 4-112 is machined on one side of the outer wall of the transverse main retention rod 4-11 along its length. A strip magnet 4-13 is installed in the strip groove 4-112. A strip iron block 4-14 is installed on the inner wall of the transverse U-shaped retention frame 4-12 along its length. The strip iron block 4-14 passes through the strip groove 4-112 and is magnetically attracted to the strip magnet 4-13.

[0018] The strip iron block 4-14 falls into the strip groove 4-112, where it reliably magnetically attracts the pre-embedded strip magnet 4-13. This causes the transverse U-shaped retaining frame 4-12 to completely enclose the transverse main retaining rod 4-11, thus forming an additional layer in the thickness direction of the transverse mortar joint retaining rod 4-1, increasing the actual mortar joint width accordingly. When the mortar joint width needs to be reduced on-site, the transverse U-shaped retaining frame 4-12 can be removed entirely by overcoming the magnetic force, restoring the transverse main retaining rod 4-11 to its original single thickness, and the mortar joint width is reduced accordingly. This magnetic combination structure requires no bolts, washers, or tools, allowing for quick assembly and disassembly, high adjustment precision, and meeting diverse design requirements for mortar joint width. It also ensures the overall rigidity and positioning stability of the self-adjusting retaining component 4 after adjustment.

[0019] Specific Implementation Method 3: This implementation method is a further limitation of Specific Implementation Method 1 or 2. Each universal joint 4-2 includes a hinge joint 4-21, a hinge rod 4-22, a telescopic rod 4-23, a blocking plate 4-24, and an elastic element 4-25. The telescopic rod 4-23 is inserted into the telescopic blind hole 4-111. A longitudinal mortar joint retention rod 4-3 is hinged to the lower end of the hinge joint 4-21. A notch 4-211 is machined on the hinge joint 4-21 along its thickness direction. The notch 4-211 is hinged to one end of the hinge rod 4-22. The other end of the hinge rod 4-22 is fixedly connected to one end of the telescopic rod 4-23. A blocking plate 4-24 is provided at the other end of the telescopic rod 4-23. The elastic element 4-25 is fitted on the telescopic rod 4-23. One end of the elastic element 4-25 abuts against the blocking plate 4-24, and the other end of the elastic element 4-25 abuts against the inner wall of the telescopic blind hole 4-111.

[0020] When the transverse U-shaped retaining frame 4-12 and the longitudinal U-shaped retaining frame 4-33 are removed, the elastic element 4-25, which was originally compressed by the two, immediately loses its restraint and extends freely. Its rebound force pushes the universal joint 4-2 to move towards the end face of the transverse mortar joint retaining rod 4-1 and fits tightly, thereby forming a gapless connection between the transverse mortar joint retaining rod 4-1 and the longitudinal mortar joint retaining rod 4-3, ensuring that the surface of the new mortar joint is flat and without any extra protrusions, thus meeting the visual requirements of fair-faced brick walls for straight lines and smooth grooves. Meanwhile, the telescopic rod 4-23 and the blocking plate 4-24 can freely extend and retract axially within the telescopic blind hole 4-111 to compensate for dimensional changes, and can also rotate around their own axis, allowing the longitudinal mortar joint retaining rod 4-3 to swing circumferentially around the telescopic rod 4-23 for multi-angle positioning. The end of the telescopic rod 4-23 is hinged to the universal joint 4-2 via the hinge joint 4-21, giving the universal joint 4-2 a combined degree of freedom of ball joint and sliding, which can act as a true universal joint between the transverse mortar joint retaining rod 4-1 and the longitudinal mortar joint retaining rod 4-3. This design significantly improves the adaptability of the device in narrow working areas, allowing operators to complete the entire process of extraction, rotation, and repositioning without the need for additional tools, significantly improving construction efficiency and operational comfort.

[0021] Specific Implementation Method Four: This implementation method further defines Specific Implementation Method One, Two, or Three. Each longitudinal mortar joint retaining rod 4-3 includes a longitudinal main retaining rod 4-31, an operating pull rod 4-32, a longitudinal U-shaped retaining frame 4-33, a bar magnet 4-34, and a bar iron block 4-35. The lower end of the hinge joint 4-21 is hinged to the upper end of the longitudinal main retaining rod 4-31. The longitudinal main retaining rod 4-31 passes through the longitudinal U-shaped retaining frame 4-33. The lower end of the longitudinal main retaining rod 4-31 is provided with an operating pull rod 4-32. The side wall of the longitudinal main retaining rod 4-31 is machined with a bar groove 4-311 along its length. A bar magnet 4-34 is provided in the bar groove 4-311. A bar iron block 4-35 passes through the bar groove 4-311. The bar magnet 4-34 and the bar iron block 4-35 are magnetically attracted to each other.

[0022] The operating lever 4-32 provides workers with a reliable grip, allowing them to easily apply pulling force to smoothly pull the longitudinal main retaining rod 4-31 out of the first mortar joint 5 or the second mortar joint 6. The longitudinal U-shaped retaining frame 4-33 achieves rapid assembly through magnetic attraction between its inner strip iron block 4-35 and the strip magnet 4-34 within the strip groove 4-311 of the longitudinal main retaining rod 4-31. This attraction not only ensures precise positioning but also allows the longitudinal U-shaped retaining frame 4-33 to tightly wrap around the longitudinal main retaining rod 4-31, significantly increasing the overall thickness of the longitudinal mortar joint retaining rod 4-3, thereby adjusting the mortar joint width to the design value. When it is necessary to reduce the mortar joint width, simply overcome the magnetic force to remove the longitudinal U-shaped retaining frame 4-33, and the thickness will return to the individual size of the longitudinal main retaining rod 4-31. The adjustment process requires no auxiliary tools, making disassembly and assembly convenient, adapting to the on-site needs of various mortar joint specifications, and effectively improving construction efficiency and finished product consistency.

[0023] Specific implementation method five: This implementation method is a further limitation of specific implementation methods one, two, three or four. An additional bar magnet 8 is also provided in the bar groove one 4-112. The additional bar magnet 8 is magnetically attracted to the bar magnet one 4-13 and the additional bar magnet 8 is magnetically attracted to the bar iron block one 4-14.

[0024] To further achieve precise adjustment of mortar joint depth, this device features a strip groove 4-112 on the upper surface of the main transverse support rod 4-11, with a detachable additional bar magnet 8 installed on the bottom wall of this groove. When the bar iron block 4-14 enters the groove 4-112 from top to bottom, its bottom surface magnetically engages with the additional bar magnet 8, thereby raising the transverse U-shaped support frame 4-12 as a whole. This increases the combined thickness of the transverse U-shaped support frame 4-12 and the main transverse support rod 4-11. Since the combined thickness directly determines the final depth of the mortar joint groove, the combined thickness can be quickly and continuously adjusted by increasing or decreasing the number of additional bar magnets 8, thus achieving precise control of the mortar joint depth. This structure not only simplifies the on-site adjustment process but also utilizes magnetic self-locking to ensure stable and reliable thickness after adjustment, avoiding the defects of traditional shim or bolt adjustment methods that are prone to loosening and cumbersome to operate, significantly improving construction efficiency and the consistency of finished product quality.

[0025] Working principle: In use, first insert the right longitudinal mortar joint retainer 4-3 into the first mortar joint 5, and the left longitudinal mortar joint retainer 4-3 into the second mortar joint 6, and make the transverse mortar joint retainer 4-1 close to the upper edge of the second block 2, forming a three-way positioning of the mortar joint space; the mortar maintains the predetermined thickness and shape under the constraint of the self-adjusting retainer 4. After filling, lay the demonstration block 7 on the transverse mortar joint retainer 4-1, so that it forms a temporary clamp with the second block 2. At this time, the operator holds the lower end of the right longitudinal mortar joint retainer 4-3, applies slight force and uses the universal joint 4-2 connected to it to rotate the right longitudinal mortar joint retainer 4-3 around the axis of the universal joint 4-2, so as to smoothly withdraw it from the first mortar joint 5; then pull the transverse mortar joint retainer 4-1 horizontally to pull it out from the gap between the second block 2 and the demonstration block 7. After being pulled out, the transverse mortar joint placement rod 4-1 is adjusted to the upper edge of the third block 3 using the hinge function of the two universal joints 4-2. At the same time, the original right-side longitudinal mortar joint placement rod 4-3 is adjusted to the left edge of the third block 3, thus forming a new mortar joint positioning space. By repeating the above steps, the longitudinal and transverse mortar joints can be continuously and synchronously placed during the masonry process, achieving a continuous operation of "joint placement as masonry is completed".

Claims

1. A mortar joint retaining rod for masonry exterior walls, characterized in that: Includes a self-adjusting retainer (4), which is disposed between the first block (1), the second block (2) and the third block (3). A first mortar joint (5) is formed between the first block (1) and the second block (2), and a second mortar joint (6) is defined between the second block (2) and the third block (3). One end of the self-adjusting retainer (4) is disposed in the first mortar joint (5), and the other end of the self-adjusting retainer (4) is disposed in the second mortar joint (6). The middle part of the self-adjusting retainer (4) is attached to the upper edge of the second block (2). The self-adjusting retainer (4) includes a transverse mortar joint retainer (4-1), two universal joints (4-2) and two longitudinal mortar joint retainer (4-3). A universal joint (4-2) is passed through each end of the transverse mortar joint retainer (4-1), and a longitudinal mortar joint retainer (4-3) is hinged to each universal joint (4-2).

2. The mortar joint retaining rod for masonry exterior walls according to claim 1, characterized in that: The transverse mortar joint retaining rod (4-1) includes a transverse main retaining rod (4-11), a transverse U-shaped retaining frame (4-12), a bar magnet (4-13), and a bar iron block (4-14). The transverse main retaining rod (4-11) is inserted into the transverse U-shaped retaining frame (4-12). Both ends of the transverse main retaining rod (4-11) are machined with telescopic blind holes (4-111). Each telescopic blind hole (4-111) contains a telescopically insertable universal joint (4-111). 2) A strip groove (4-112) is machined on one side of the outer wall of the transverse main retention rod (4-11) along its length direction. A bar magnet (4-13) is installed in the strip groove (4-112). A strip iron block (4-14) is installed on the inner wall of the transverse U-shaped retention frame (4-12) along its length direction. The strip iron block (4-14) passes through the strip groove (4-112). The strip iron block (4-14) and the bar magnet (4-13) are magnetically attracted to each other.

3. A mortar joint retaining rod for masonry exterior walls according to claim 2, characterized in that: Each universal joint (4-2) includes a hinge joint (4-21), a hinge rod (4-22), a telescopic rod (4-23), a blocking plate (4-24), and an elastic element (4-25). The telescopic rod (4-23) passes through the telescopic blind hole (4-111). The lower end of the hinge joint (4-21) is hinged with a longitudinal mortar joint retention rod (4-3). A notch (4-211) is machined on the hinge joint (4-21) along its thickness direction. The notch (4-211) contains... One end of the hinge rod (4-22) is hinged to the other end of the telescopic rod (4-23), and the other end of the telescopic rod (4-23) is fixedly connected to one end of the telescopic rod (4-23). ​​The other end of the telescopic rod (4-23) is provided with a blocking plate (4-24). The elastic element (4-25) is fitted on the telescopic rod (4-23), with one end of the elastic element (4-25) abutting against the blocking plate (4-24) and the other end of the elastic element (4-25) abutting against the inner wall of the telescopic blind hole (4-111).

4. A mortar joint retaining rod for masonry exterior walls according to claim 3, characterized in that: Each longitudinal mortar joint retaining rod (4-3) includes a longitudinal main retaining rod (4-31), an operating pull rod (4-32), a longitudinal U-shaped retaining frame (4-33), a second bar magnet (4-34), and a second bar iron block (4-35). The lower end of the hinge joint (4-21) is hinged to the upper end of the longitudinal main retaining rod (4-31). The longitudinal main retaining rod (4-31) passes through the longitudinal U-shaped retaining frame (4-33). An operating lever (4-32) is provided at the lower end of the rod (4-31). A strip groove (4-311) is machined along the length of the side wall of the longitudinal main rod (4-31). A strip magnet (4-34) is provided in the strip groove (4-311). A strip iron block (4-35) is inserted in the strip groove (4-311). The strip magnet (4-34) and the strip iron block (4-35) are magnetically attracted to each other.

5. A mortar joint retaining rod for masonry exterior walls according to claim 2, characterized in that: An additional bar magnet (8) is also provided in the first bar groove (4-112). The additional bar magnet (8) is magnetically attracted to the first bar magnet (4-13), and the additional bar magnet (8) is magnetically attracted to the first bar iron block (4-14).

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