A handgrip

Abstract

This invention provides a hand gripper related to the field of fitness equipment technology, including a first handle, a second handle, a torsion spring, and a gear adjustment knob assembly. The gear adjustment knob assembly includes a shaft core, an expansion block, and a limiting unit. The shaft core passes through the hollow holes of the first and second connecting rings. The expansion block is located on the outside of the shaft core and is displaced circumferentially or axially relative to the first or second connecting ring under the control of the limiting unit. The torsion spring includes an arc-shaped spring body and spring feet extending to both sides. As the expansion block moves, the spring body contracts or expands, thereby changing the fixed angle between the first and second handles. The advantages of this invention are: 1. It uses a torsion spring as an elastic element to support grip strength adjustment; 2. The elastic element and adjustment element are fully covered, resulting in an aesthetically pleasing appearance and safe operation; 3. The gear adjustment operation is convenient; 4. Different gears can be set to meet the fitness needs of people with different conditions.

Description

Technical Field

[0001] This invention relates to the field of fitness equipment technology, specifically a hand grip strengthener. Background Technology

[0002] Generally speaking, hand grippers, as exercise equipment used to train hand or forearm muscle strength, have the advantages of being small in size, easy to use and carry, and can be easily used anytime and anywhere. Users hold the hand gripper with one hand and repeatedly perform the action of applying pressure to a pair of working arms to bring them closer together and then releasing the force. Through repeated force application, the elasticity provided by the spring is overcome, thereby improving the muscle strength of the hand or arm.

[0003] Most hand grippers on the market currently use a spring between two working arms to change the torque. Because the spring force is constant, this common type of gripper has the drawback of not being able to change the grip strength itself, i.e., not being able to change the strength of the spring force. Furthermore, because the spring is exposed, gaps can easily form when the grip is extended, and it can easily pinch the hand when retracting. Summary of the Invention

[0004] The purpose of this invention is to provide a grip strengthener to solve the problem of constant strength in existing grip strengtheners.

[0005] The present invention is implemented as follows: a grip strengthener, comprising a first handle, a second handle, a torsion spring, and a gear adjustment knob assembly;

[0006] The first handle includes a first handle rod and a first connecting ring disposed at the end of the first handle rod; the second handle includes a second handle rod and a second connecting ring disposed at the end of the second handle rod; the middle portions of the first and second connecting rings are hollowed out.

[0007] The gear shift knob assembly includes a shaft core, an expansion block, and a limiting unit; the shaft core passes through the hollow holes of the first connecting ring and the second connecting ring, and the expansion block is located on the outside of the shaft core and is displaced circumferentially or axially relative to the first connecting ring or the second connecting ring under the control of the limiting unit.

[0008] The torsion spring includes an arc-shaped spring body and spring feet extending to both sides. The spring body is fitted onto the outside of the expansion block, and the spring feet on both sides are fitted into the first and second handles, respectively. As the expansion block moves, the spring body contracts or expands, thereby changing the fixed angle between the first and second handles.

[0009] Preferably, the limiting unit includes a knob and a limiting ring. The knob is disposed at the end of the shaft core, the limiting ring is sleeved on the outside of the shaft core, and the expansion blocks are disposed in pairs on the outer wall of the limiting ring.

[0010] The knob includes a knob cap, and on the inner side of the knob cap are outwardly protruding teeth in a three-tiered stepped shape. The teeth are, from the outside to the inside, driving teeth, positioning teeth, and support teeth. On the inner ring wall of the limiting ring, there are pairs of first grooves for engaging the driving teeth.

[0011] Preferably, there are two knobs, including a first knob and a second knob respectively disposed at both ends of the shaft core; there are two limiting rings, including a first limiting ring and a second limiting ring, and the first limiting ring and the second limiting ring have the same structure.

[0012] Preferably, the two ends of the shaft are respectively fitted into the first knob and the second knob, a protruding locking block is provided in the middle of the shaft, and a second groove for the locking block to be fitted is provided on the inner wall of the second connecting ring.

[0013] Preferably, there are two first connecting rings, which are respectively disposed on the upper and lower sides of the end of the first handle, and at least one pair of slots for engaging the positioning teeth are symmetrically disposed on the inner wall of each first connecting ring.

[0014] Preferably, the limiting unit includes an elastic element and a positioning groove; the elastic element is disposed on the first or second connecting ring, and the positioning groove is disposed on the outer wall of the shaft core directly opposite it. The number of positioning grooves is at least two, and a plurality of the positioning grooves are arranged along the longitudinal direction. The elastic element can be snapped into the positioning groove.

[0015] Preferably, the expansion blocks are arranged in pairs along the axial direction on the shaft core, and the expansion blocks and the shaft core are displaced synchronously. As the shaft core is displaced, the expansion blocks move up and down relative to the elastic element, and the torsion spring is engaged or disengaged from the expansion blocks.

[0016] Preferably, a longitudinal through groove is provided on the side wall of the shaft core, and a protruding ridge is provided on the inner wall of the first or second connecting ring, the protruding ridge moving up and down along the through groove.

[0017] Preferably, a through hole is provided on the second connecting ring, and the elastic element includes a base, a spring and a positioning block; the base and the positioning block are connected by the spring, the elastic element passes through the through hole, and the base abuts against the first handle after passing through the through hole.

[0018] Preferably, there are two torsion springs, with the two spring bodies respectively mounted on the outside of different expansion blocks, and the ends of the two spring legs on the same side are connected in an arc shape.

[0019] The beneficial effects of the present invention using the above technical solution are as follows: 1. It abandons the original tension spring and uses a torsion spring as the elastic element to support grip strength adjustment; 2. The elastic element and adjustment element are fully covered, which is aesthetically pleasing and safe to operate; 3. The gear adjustment is convenient; 4. Different gears are set. For women, children and other people with weak strength, the low gear can be used, and for men or fitness enthusiasts, the medium and high gears can be used, which can meet the fitness needs of people with different conditions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a shaft core according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the first knob of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the first limiting ring of the present invention;

[0024] Figure 4 This is a schematic diagram of the torsion spring of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the first handle of the present invention;

[0026] Figure 6 yes Figure 5 A magnified view of a portion of the image;

[0027] Figure 7 This is a schematic diagram of the structure of the second handle of the present invention;

[0028] Figure 8 This is a schematic diagram of the gear shift knob assembly of the present invention;

[0029] Figure 9 This is a schematic diagram of a connection state according to the present invention;

[0030] Figure 10 This is a schematic diagram of the structure of one embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the shaft core according to the second embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the elastic element of the present invention;

[0033] Figure 13 This is a schematic diagram of the through hole structure of the present invention;

[0034] Figure 14 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0035] Figure 15 This is a schematic diagram of the shaft core according to the third embodiment of the present invention.

[0036] In the diagram: 1—shaft core, 2—first knob, 21—knob, 22—locking tooth, 221—drive tooth, 222—positioning tooth, 223—support tooth, 23—anti-slip tooth, 3—second knob, 4—first limiting ring, 5—second limiting ring, 6—expansion block, 7—arc-shaped groove, 8—first groove, 9—locking tooth, 10—first handle, 11—first connecting ring, 12—second handle, 13—second connecting ring, 14—bayonet, 15—locking block, 16—second groove, 17—spring body, 18—spring foot, 19—slot, 20—positioning groove, 21—through hole, 22—base, 23—spring, 24—positioning block, 25—longitudinal through groove, 26—protruding ridge. Detailed Implementation

[0037] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] like Figures 1-15 As shown, the present invention provides a grip strength device, including a first handle, a second handle, a torsion spring, and a gear adjustment knob assembly.

[0040] The gear shift knob assembly of the present invention includes:

[0041] Shaft core 1; Shaft core 1 is cylindrical and serves as the pivot point for the first handle and the second handle. Both the first handle and the second handle swing left and right around shaft core 1 as the base point, thereby achieving the effect of applying force or releasing force by hand.

[0042] The expansion block 6 and the limiting unit; the expansion block 6 is located on the outside of the shaft core 1 and is displaced relative to the first connecting ring or the second connecting ring under the control of the limiting unit.

[0043] The first handle of the present invention includes a first handle 10 and a first connecting ring 11 disposed at the end of the first handle 10. The first connecting ring 11 has a hollow center and is fitted onto the outer side of the shaft core 1. The second handle of the present invention includes a second handle 12 and a second connecting ring 13 disposed at the end of the second handle 12. The second connecting ring 13 has a hollow center and is fitted onto the outer side of the shaft core 1. To adjust the elasticity between the two handles, the included angle between the first handle and the second handle can be adjusted by a gear adjustment knob assembly.

[0044] The torsion spring of the present invention includes an arc-shaped spring body 17 and spring feet 18 extending to both sides. The spring body 17 is fitted onto the outside of the expansion block 6, and the spring feet 18 on both sides are fitted into the first and second handles, respectively. Slots 19 for inserting the torsion spring are provided on the inner sides of both the first handle 10 and the second handle 12.

[0045] As can be seen from the above, the present invention adjusts the fixed angle between the two handles by changing the opening angle of the torsion spring mounted on the expansion block. Since the expansion block has two modes of movement on the shaft core, namely circumferential rotation or axial displacement, there are correspondingly two implementation methods for the gear adjustment knob assembly and handle.

[0046] As one embodiment, the limiting unit of the present invention includes a knob and a limiting ring. Preferably, the number of knobs is two, including:

[0047] The first knob 2 includes a knob cap 21. Inside the knob cap 21, there are outwardly protruding, three-tiered locking teeth 22. From the outside in, the locking teeth 22 are, in order, a driving tooth 221, a positioning tooth 222, and a supporting tooth 223. The driving tooth 221, positioning tooth 222, and supporting tooth 223 are arranged sequentially, and the tooth shape of each tier can be set as needed. As one embodiment, the driving tooth 221 is set as a rectangular block, the width of the positioning tooth 222 and the supporting tooth 223 is smaller than the width of the driving tooth 221, and the distance from the endpoints of the driving tooth 221, positioning tooth 222, and supporting tooth 223 to the knob cap 21 increases sequentially. Furthermore, the outer surface of the positioning tooth 222 is set as an arc-shaped surface to facilitate the positioning tooth 222's disengagement from the locking slot. Furthermore, the driving tooth 221, positioning tooth 222, and supporting tooth 223 can be formed by connecting three block structures, or they can be integrally molded. Furthermore, anti-slip teeth 23 are provided on the outer peripheral surface of the cap 21. During the rotation of the first knob 2, the locking teeth 22 rotate synchronously with the cap, thereby moving or locking the associated components of the device. Furthermore, in order to extend the service life of the locking teeth 22 and reduce the load on the locking teeth 22, the locking teeth 22 of the present invention are arranged in pairs, with a pair of locking teeth 22 arranged along the radial direction of the cap 21. During rotation, the two sets of locking teeth 22 together move the rotating components.

[0048] The second knob 3 has the same structure and working principle as the first knob 2 mentioned above.

[0049] Preferably, the number of limiting rings is two, including:

[0050] First limiting ring 4; The main body of the first limiting ring 4 is ring-shaped, and a pair of expansion blocks 6 with arc-shaped grooves 7 are provided on the outer ring wall of the first limiting ring 4. The diameter of the inner circle of the first limiting ring 4 is not less than the diameter of the shaft core 1, and the first limiting ring 4 can be sleeved on the outside of the shaft core 1 through both ends. The two expansion blocks 6 are arranged along the radial direction of the first limiting ring 4. Second limiting ring 5; The structure and working principle are the same as the first limiting ring 4. First grooves 8 for engaging the drive teeth 221 are respectively provided in pairs on the inner ring walls of the first limiting ring 4 and the second limiting ring 5. Further, the first grooves 8 are set to a shape that matches the shape of the drive teeth 221. Preferably, the first grooves 8 are set to a rectangular groove shape. Preferably, the height of the end of the drive teeth 221 extending beyond the positioning teeth 222 is equal to the thickness of the first limiting ring 4 and the second limiting ring 5.

[0051] Furthermore, the two ends of the shaft core 1 are respectively fitted into the first knob 2 and the second knob 3. The shaft core 1 only serves to support the first knob 2 and the second knob 3, and the shaft core 1 will not rotate with the rotation of the first knob 2 and the second knob 3. Both the upper and lower ends of the shaft core 1 are disc-shaped. On the inner side of the cap 21, there are ring-shaped and inwardly buckling teeth 9 for locking the ends of the shaft core 1. The upper and lower ends of the shaft core 1 are restricted within the space of the cap 21 by the teeth 9.

[0052] Furthermore, there are two first connecting rings 11, respectively located on the upper and lower sides of the end of the first handle 10. Each first connecting ring 11 has a slot 14 on its inner wall for engaging the positioning teeth 222. After the first knob 2 rotates a certain angle, the positioning teeth 222 engage with the slot 14, providing a locking function. The outer surface of the support teeth 223 contacts the inner wall of the first connecting ring 11, providing support. Preferably, when the teeth 22 are arranged in pairs, the slots 14 are also arranged in pairs along the radial direction of the first connecting ring. Preferably, there are at least two pairs of slots 14, and the angle between the two pairs of slots 14 corresponds to the angle the knob needs to rotate to adjust one gear position. As shown in the embodiment, two pairs of slots 14 are provided on the first connecting ring 11, corresponding to one gear adjustment achieved by rotating the first knob 90°. Those skilled in the art can also set more slots as needed to facilitate operation or refine the operating gears. The operating principle of the second knob is the same as above.

[0053] Furthermore, there is one second connecting ring 13, located at the middle of the end of the second handle 2. A protruding locking block 15 is provided in the middle of the shaft core 1, and a second groove 16 is provided on the inner wall of the second connecting ring 13 for the locking block 15 to engage. Due to the engaging action of the second groove 16 and the locking block 15, the position between the second handle and the shaft core 1 is fixed and they cannot rotate relative to each other.

[0054] Furthermore, there are two torsion springs, with the two spring bodies 17 respectively mounted on the outer side of the expansion blocks 6 of the upper and lower limit rings. Rotating the first and second knobs causes the first and second limit rings to rotate, thus the distance between the expansion blocks determines the opening angle of the arc-shaped spring body 17 in contact with them. Since the position of the second handle is fixed, the opening angle of the spring body 17 directly causes the first handle to swing, thereby changing the angle between the two handles and achieving the purpose of changing the torque.

[0055] As one embodiment, in the figure, a pair of expansion blocks 6 are respectively provided on the first limiting ring 4 and the second limiting ring 5, and a pair of locking teeth 22 are provided on both the first and second knobs. Two sets of locking slots 14 are provided on the first connecting rings 11 on the upper and lower sides. This means that rotating the first knob can achieve two gear changes. In gear one, the pair of expansion blocks 6 are placed horizontally in the center of the spring body 17, expanding the spring body 17 to the maximum opening angle; in gear two, one expansion block 6 abuts against the spring body 17, and the other expansion block 6 disengages from the spring body 17, causing the spring body 17 to retract, and the two spring feet 18 are located at the minimum opening angle. Similarly, rotating the second knob can also cause the torsion spring in contact with the second limiting ring 5 to produce two opening states. Since the first knob 2 and the second knob 3 can rotate synchronously or individually, the grip strengthener can ultimately achieve three adjustable levels, as shown in the embodiment: 1. Low level with both torsion springs at their minimum opening; 2. Medium level with one torsion spring at its minimum opening and the other at its maximum opening; 3. High level with both torsion springs at their maximum opening. Those skilled in the art can achieve even more adjustable levels by setting multiple sets of latches, multiple sets of expansion blocks, multiple limit rings, multiple torsion springs, etc., all of which follow the operating principle of this application and fall within the protection scope of this application.

[0056] Furthermore, gear position indicators are provided on the first and second knobs.

[0057] In another embodiment, the limiting unit of the present invention includes an elastic element and a positioning groove 20. The elastic element is disposed on the first or second connecting ring, and the positioning groove 20 is disposed on the outer wall of the shaft core 1 opposite to it. There are at least two positioning grooves 20, which are arranged in the longitudinal direction. The elastic element can be snapped into the positioning groove 20. The expansion blocks 6 are arranged in pairs on the shaft core 1 in the axial direction. The expansion blocks 6 and the shaft core 1 are displaced synchronously. As the shaft core 1 is displaced, the expansion blocks 6 move up and down relative to the elastic element, and the torsion spring is engaged or disengaged on the expansion blocks. A cover with a hollow center is provided at both ends of the shaft core 1.

[0058] Furthermore, a through hole 21 is provided on the second connecting ring 13, and the elastic element includes a base 22, a spring 23, and a positioning block 24. The base 22 and the positioning block 24 are connected by the spring 23, and the elastic element passes through the through hole 21. The base 22 abuts against the first handle after passing through the through hole 21. The outer side of the positioning block 24 is hemispherical, which facilitates insertion or removal.

[0059] Furthermore, a longitudinal through groove 25 is provided on the side wall of the shaft core 1, and a protruding rib 26 is provided on the inner wall of the second connecting ring 13. The protruding rib 26 moves up and down along the through groove 25 to restrict the shaft core from rotating circumferentially relative to the second connecting ring, thus limiting the movement of the expansion block to the axial direction.

[0060] In one embodiment, there are three positioning grooves 20, which are equally spaced. There are two pairs of expansion blocks 6, spaced apart. Each pair of expansion blocks 6 corresponds to one of the positioning grooves 20 at the top or bottom. When the elastic element is engaged in the central positioning groove, two torsion springs are engaged in the upper and lower pairs of expansion blocks respectively. At this time, both torsion springs are in the expanded state, and the distance between the two handles is at its maximum. When the elastic element is engaged in either the upper or lower positioning groove, both torsion springs disengage from the expansion block, returning to their original state, and the distance between the two handles is at its minimum.

[0061] In another embodiment, there are three pairs of expansion blocks. Two pairs are arranged close together, and the other pair is spaced apart. The two pairs of spaced-apart expansion blocks correspond to the positioning grooves 20 at the upper and lower ends, respectively. For example, two pairs of close together expansion blocks are arranged at the upper part, and one pair of spaced-apart expansion blocks are arranged at the lower part. When the elastic element is engaged in the central positioning groove, two torsion springs are engaged in the two pairs of spaced-apart expansion blocks. At this time, both torsion springs are in the open state, the distance between the two handles is the largest, and the torque is at its highest level. When the elastic element is engaged in the upper positioning groove, the upper torsion spring is engaged upward into the expansion block close to it, and the lower torsion spring is disengaged upward. At this time, a single torsion spring is open, and the torque is at its medium level. When the elastic element is engaged in the lower positioning groove, both torsion springs are disengaged from the expansion blocks, and the torque is at its low level. Those skilled in the art can achieve more levels of adjustment by setting multiple positioning grooves, multiple sets of expansion blocks, multiple torsion springs, etc., which follow the working principle of this application and are all within the protection scope of this application.

[0062] Furthermore, the ends of the two spring feet 18 on the same side of the two torsion springs of the present invention can be connected together in an arc shape, and the slot 19 can be set as a through slot.

[0063] The beneficial effects of this invention are as follows: 1. It abandons the original tension spring and uses a torsion spring as the elastic element to support grip strength adjustment; 2. The elastic element and adjustment element are fully covered, which is aesthetically pleasing and safe to operate; 3. The gear adjustment is convenient; 4. Different gears are set. For women, children and other people with weak strength, the low gear can be used, and for men or fitness enthusiasts, the medium and high gears can be used, which can meet the fitness needs of people with different conditions.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hand grip strengthener, characterized in that, Includes a first handle, a second handle, a torsion spring, and a gear shift knob assembly; The first handle includes a first handle rod and a first connecting ring disposed at the end of the first handle rod; the second handle includes a second handle rod and a second connecting ring disposed at the end of the second handle rod; the middle portions of the first and second connecting rings are hollowed out. The gear shift knob assembly includes a shaft core, an expansion block, and a limiting unit; the shaft core passes through the hollow holes of the first connecting ring and the second connecting ring, and the expansion block is located on the outside of the shaft core and is displaced circumferentially or axially relative to the first connecting ring or the second connecting ring under the control of the limiting unit. The torsion spring includes an arc-shaped spring body and spring feet extending to both sides. The spring body is fitted onto the outside of the expansion block, and the spring feet on both sides are fitted into the first and second handles, respectively. As the expansion block moves, the spring body contracts or expands, thereby changing the fixed angle between the first and second handles.

2. A hand gripper according to claim 1, characterized in that, The limiting unit includes a knob and a limiting ring. The knob is located at the end of the shaft core, and the limiting ring is sleeved on the outside of the shaft core. The expansion blocks are arranged in pairs on the outer wall of the limiting ring. The knob includes a knob cap, and on the inner side of the knob cap are outwardly protruding teeth in a three-tiered stepped shape. The teeth are, from the outside to the inside, driving teeth, positioning teeth, and support teeth. On the inner ring wall of the limiting ring, there are pairs of first grooves for engaging the driving teeth.

3. A hand gripper according to claim 2, characterized in that, The number of knobs is two, including a first knob and a second knob respectively disposed at both ends of the shaft core; the number of limiting rings is two, including a first limiting ring and a second limiting ring, and the first limiting ring and the second limiting ring have the same structure.

4. A hand gripper according to claim 2, characterized in that, The two ends of the shaft are respectively fitted into the first knob and the second knob. A protruding locking block is provided in the middle of the shaft. A second groove for the locking block to be fitted is provided on the inner wall of the second connecting ring.

5. A hand gripper according to claim 2, characterized in that, There are two first connecting rings, which are respectively located on the upper and lower sides of the end of the first handle. At least one pair of slots for engaging the positioning teeth are symmetrically arranged on the inner wall of each first connecting ring.

6. A hand gripper according to claim 1, characterized in that, The limiting unit includes an elastic element and a positioning groove; the elastic element is disposed on the first or second connecting ring, and the positioning groove is disposed on the outer wall of the shaft core directly opposite it. The number of positioning grooves is at least two, and a plurality of the positioning grooves are arranged along the longitudinal direction. The elastic element can be snapped into the positioning groove.

7. A hand gripper according to claim 6, characterized in that, The expansion blocks are arranged in pairs along the axial direction on the shaft core. The expansion blocks and the shaft core are displaced synchronously. As the shaft core is displaced, the expansion blocks move up and down relative to the elastic element. The torsion spring is engaged or disengaged from the expansion blocks.

8. A hand gripper according to claim 6, characterized in that, The shaft core has a longitudinal through groove on its side wall, and a protruding ridge is provided on the inner wall of the first or second connecting ring. The protruding ridge moves up and down along the through groove.

9. A hand gripper according to claim 6, characterized in that, The second connecting ring is provided with a through hole, and the elastic element includes a base, a spring and a positioning block; the base and the positioning block are connected by the spring, the elastic element passes through the through hole, and the base abuts against the first handle after passing through the through hole.

10. A hand gripper according to claim 7, characterized in that, The number of torsion springs is two, and the two spring bodies are respectively clamped on the outside of different expansion blocks, with the ends of the two spring legs on the same side connected in an arc shape.

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