Intelligent hospital bed set meal matching plate

Abstract

The meal plate is arranged on the tail side of the sickbed, the meal plate comprises a lifting assembly, an overturning and folding assembly and a dining table assembly, the lifting assembly comprises a supporting plate, a bolt bottom plate, a guide rail, a motor, a lead screw and a sliding table, the supporting plate is vertically arranged, and a long hole is formed in the middle of the supporting plate; the bottom side of the supporting plate is mounted on the bed frame on the bed tail side through a bolt bottom plate; the overturning and folding assembly comprises a T-shaped support, a bearing frame and an electric push rod. The dining table assembly comprises a main table plate, an extension dining plate A and an extension dining plate B. The main table plate is provided with first through groove bodies in the left side direction and the right side direction of the main table plate, the main table plate is provided with second through groove bodies in the front side direction and the rear side direction of the main table plate, and the grooving height of the first groove bodies in the main table plate is larger than that of the second groove bodies. By integrating the functions of automatic lifting, turnover folding and extension, the dining plate can be freely adjusted according to the requirements of a patient, manual intervention is not needed, and the dependence of the patient on nursing personnel or accompanying personnel is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of supporting facilities for hospital beds, and in particular to an intelligent hospital bed supporting table. Background Art

[0002] With the advent of an aging society, more and more patients need to stay in bed or live in the hospital for a long time, which makes the functionality and comfort of hospital beds an important concern, especially the issue of dining in the bed.

[0003] There are several types of bed dining boards currently used in hospitals:

[0004] The first type is placed on the railing of the hospital bed. Existing technologies include a hospital bed equipped with a dining board disclosed in Publication No. CN107647989A, a hospital bed dining board and hospital bed disclosed in Publication No. CN213465699U, and a multifunctional hospital bed dining board disclosed in Publication No. CN213250575U.

[0005] The second type is a hospital bed with a sliding structure installed on the side of the bed, such as a hospital bed with a sliding dining table disclosed in Publication No. CN214018200U and a multifunctional hospital bed with a sliding dining table disclosed in Publication No. CN206597098U.

[0006] However, all of the above methods require manual operation, making the use of a dining board particularly difficult when the patient is bedridden or has limited mobility. A caregiver or the patient's companion needs to pull the dining board up from the end of the bed and place it on the bed rail for use. After use, the dining board needs to be removed by the caregiver or companion and re-hung at the end of the bed. This process is both cumbersome and inconvenient for patients who need to be bedridden for a long time. Especially when the patient lacks mobility or is not accompanied by a companion, the dining board is almost impossible to use, greatly affecting the patient's dining experience and quality of life.

[0007] In a hospital setting, patients' daily care relies on the assistance of nurses or caregivers. Without prompt assistance, patients may not be able to use a meal board independently, making it difficult to eat and even affecting their nutritional intake. Furthermore, traditional meal boards often take up a lot of space, are complex to operate, and are difficult to adjust. This results in inefficient use of bed space and can cause discomfort or inconvenience to patients during meals.

[0008] Therefore, designing an intelligent bed dining board that can automatically rise and fall, flip and fold can greatly improve the patient's dining convenience, especially for patients with limited mobility. Summary of the Invention

[0009] The purpose of the present invention is to provide a dining table for an intelligent hospital bed. By integrating automatic lifting, flipping, folding and extending functions, the dining table can be freely adjusted according to the patient's needs without manual intervention, greatly reducing the patient's dependence on nursing staff or accompanying personnel.

[0010] To achieve the above objectives, the present invention provides the following technical solutions: a smart hospital bed equipped with a dining table, the dining table being arranged at the foot of the bed, the dining table comprising a lifting assembly, a flipping and folding assembly, and a dining table assembly, wherein:

[0011] The lifting assembly includes a support plate, a bolt base plate, a guide rail, a motor, a lead screw and a slide. The support plate is vertically arranged and has a long opening in the middle. The bottom side of the support plate is installed on the bed frame at the end of the bed through the bolt base plate. The guide rail and lead screw are respectively arranged on the front and rear sides of the support plate. The lower shaft end of the lead screw is connected to the motor, and the upper shaft end of the lead screw is rotatably connected to the top of the support plate. A slide is provided on the lead screw. The slide is slidably mounted on the guide rail. A T-shaped linkage plate is provided on one side of the slide. The linkage plate passes through the long opening on the support plate and is connected to the slide. The linkage plate moves with the slide and causes the slide to move along the guide rail.

[0012] The flip and folding assembly includes a T-shaped bracket, a support frame and an electric push rod. The T-shaped bracket is fixed to the linkage plate by screws. The front end of the middle of the T-shaped bracket is movably hinged to the support frame, and the dining table assembly is installed on the support frame.

[0013] The dining table assembly includes a main table top, an extended dining board A, and an extended dining board B. The main table top is provided with a first interpenetrating groove along its left and right sides, and the main table top is provided with a second interpenetrating groove along its front and rear sides. The groove height of the first groove on the main table top is higher than that of the second groove.

[0014] Preferably, an electric push rod is hingedly mounted on the lower side of the T-shaped bracket, and the front axial end of the electric push rod is hingedly connected to the rear end of the support bracket. The support bracket moves with the electric push rod and flips and folds relative to the T-shaped bracket. When the electric push rod is extended, it pushes the support bracket to flip relative to the T-shaped bracket, so that the dining board changes from a stored state to a usable state. At this time, the dining table will be stably hung at the end of the bed or on the bed rails with the support of the support bracket, providing a dining space for the patient. After use, the electric push rod retracts to push the support bracket to flip and fold relative to the T-shaped bracket, and the dining board is put away and placed close to the end of the bed to avoid taking up too much space.

[0015] Preferably, the above-mentioned lifting assembly drives the lead screw to rotate through the motor and moves the slide, and the slide drives the slide to follow through the linkage plate, and the slide drives the flipping and folding assembly and the dining table assembly upward to achieve height adjustment of the flipping and folding assembly and the dining table assembly. When the dining table assembly reaches a certain height, the electric push rod can switch the support frame from a folded state to a flat state through action, providing support for the dining table.

[0016] Preferably, two groups of extended dining boards A are provided and are distributed on both sides of the first trough body on the left and right sides of the main table plate, and two groups of extended dining boards B are provided and are distributed on both sides of the second trough body on the front and rear sides of the main table plate. The two groups of extended dining boards A and extended dining boards B are respectively slidably connected to the first trough body and the second trough body and are locked and limited by a ratchet module; the corners of the two groups of extended dining boards A and extended dining boards B are all arc-shaped.

[0017] Preferably, the extended dining board B has a double-layer structure, comprising a lower plate, a support spring connected to the lower plate, and an upper plate connected to the support spring, wherein the length of the upper plate is shorter than that of the lower plate. The extended dining board B adopts a floating structure consisting of the lower plate, the upper plate, and the support spring. The floating structure can compress the support spring by pressing the upper plate when stored, so that the extended dining board B can be stored in the second slot. In addition, the floating structure can provide elastic support from the support spring when extended, so that the plane height of the upper plate remains roughly flush with the plane height of the main table, thereby avoiding inconvenience caused by uneven heights of the dining boards. Since the extended dining board A is located in the first slot, and the first slot is located on the upper side of the main table, the height of the extended dining board A remains roughly flush with the main table and does not need to be adjusted. By setting up the extended dining board A and the extended dining board B, the patient can extend the width of the four sides according to his needs during use, thereby further improving the patient's comfortable experience in using the dining board. After use, the extended parts of the extended dining board A and the extended dining board B will be gathered and concentrated in the two grooves of the main table board, so as not to occupy too much space at the end of the bed.

[0018] Preferably, the ratchet module includes a long rack, a gear, a ratchet, an elastic column and a button, wherein the long rack is arranged in the first trough body and the second trough body and is respectively connected to the extended dining plate A and the lower plate body laterally, and the gear is rotatably installed on the outside of the first trough body and the second trough body, the gear is engaged with the long rack, and the ratchet is coaxially connected to the gear.

[0019] Preferably, the button is arranged on the diagonal side of the end face of the main table, and an elastic column is arranged at the lower end of the button. The bottom end of the elastic column extends to one side of the ratchet and is connected to a ratchet that cooperates with the ratchet. When the button is pressed, the ratchet moves downward and separates from the ratchet, so that the extended dining plate A and the lower plate body can slide freely along the first groove body and the second groove body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By integrating automatic lifting, flipping, folding, and extending functions, this invention allows the dining board to be freely adjusted according to the patient's needs without manual intervention, greatly reducing the patient's dependence on caregivers or accompanying personnel. Especially for patients with limited mobility or without accompanying personnel, patients can easily adjust the height, angle, and space of the dining board, freeing themselves from the limitations of traditional dining boards that require manual operation.

[0022] 2. Traditional bedside dining boards usually take up a large space at the end of the bed when in use and cannot be flexibly stored, adding unnecessary burden to the bed. This invention has designed a reversible and foldable dining board that can be automatically folded and stored when not in use, minimizing the space occupied. This is not only convenient for patients but also saves valuable space in the hospital room.

[0023] 3. By designing extendable dining boards A and B, this invention allows the width of the dining table to be adjusted according to the patient's needs, providing more dining space. This extendable board can significantly improve the dining experience, especially for patients with special needs, such as those requiring a larger space. The extendable board utilizes a sliding structure, with a ratchet lock and spring support design to ensure stability during extension, preventing height inconsistencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 Schematic diagram of the structure of the flip and folding assembly and the dining table assembly in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the dining table assembly when it is stored in an embodiment of the present invention;

[0028] Figure 5 The dining table assembly in the embodiment of the present invention is unfolded;

[0029] Figure 6 Schematic diagram of the positions of the first trough body and the second trough body on the main plate in an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the double-layer floating structure of the extended dining board B in an embodiment of the present invention;

[0031] Figure 8 Schematic diagram of the structure of the extended dining plate A and the ratchet module in an embodiment of the present invention;

[0032] Figure 9 This is a practical application diagram of the present invention.

[0033] In the picture:

[0034] 1. Lifting assembly; 101. Support plate; 102. Bolt base plate; 103. Guide rail; 104. Motor; 105. Lead screw; 106. Slide; 107. Slide seat; 108. Linkage plate;

[0035] 2. Flip and fold assembly; 201. T-shaped bracket; 202. Support bracket; 203. Electric push rod;

[0036] 3. Dining table assembly; 301. Main table plate; 302. Extended dining plate A; 303. Extended dining plate B; 304. First trough; 305. Second trough; 306. Long rack; 307. Gear; 308. Elastic column; 309. Ratchet; 310. Button. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] See also Figure 1-Figure 2 The present invention provides a technical solution: an intelligent hospital bed equipped with a dining table, wherein the dining table is arranged at the end of the bed, and the dining table includes a lifting component 1, a flipping and folding component 2 and a dining table component 3.

[0041] In this embodiment, the lifting assembly 1 includes a support plate 101, a bolt base plate 102, a guide rail 103, a motor 104, a screw 105 and a slide 106. The support plate 101 is arranged vertically and has a long opening in the middle. The bottom side of the support plate 101 is installed on the bed frame at the end of the bed through the bolt base plate 102; the guide rail 103 and the screw 105 are respectively arranged on the front and rear sides of the support plate 101, the lower shaft end of the screw 105 is connected to the motor 104, and the upper shaft end of the screw 105 is rotatably connected to the top of the support plate 101, and a slide 107 is provided on the screw 105; the slide 106 is slidably mounted on the guide rail 103, and a T-shaped linkage plate 108 is provided on one side of the slide 107. The linkage plate 108 passes through the long opening on the support plate 101 and is connected to the slide 106. The linkage plate 108 moves with the slide 107 and causes the slide 106 to move along the guide rail 103.

[0042] See also Figure 3 In this embodiment, the flip and folding component 2 includes a T-shaped bracket 201, a support bracket 202 and an electric push rod 203. The T-shaped bracket 201 is fixed to the linkage plate 108 by screws. The front end of the middle of the T-shaped bracket 201 is movably hinged to the support bracket 202. The lower side of the T-shaped bracket 201 is hinged with the electric push rod 203. The front shaft end of the electric push rod 203 is hinged to the rear end of the support bracket 202. The support bracket 202 moves with the electric push rod 203 and performs a flip and folding action relative to the T-shaped bracket 201. The dining table component 3 is installed on the support bracket 202.

[0043] When the electric actuator 203 extends, it pushes the support bracket 202 to rotate relative to the T-shaped bracket 201, allowing the dining board to transition from a stowed position to a usable position. At this point, supported by the support bracket 202, the dining table is stably suspended at the foot of the bed or on the bed rails, providing a comfortable dining space for the patient. After use, the electric actuator retracts, pushing the support bracket 202 to flip and fold relative to the T-shaped bracket 201, stowing the dining board and placing it snugly against the foot of the bed, eliminating the need for excessive space.

[0044] See also Figure 4-Figure 7In this embodiment, the dining table assembly 3 includes a main table 301, an extended dining board A302, and an extended dining board B303. The main table 301 has a first slot 304 that is connected along its left and right sides, and a second slot 305 that is connected along its front and rear sides. The slot height of the first slot 304 in the main table 301 is higher than that of the second slot 305. The extended dining board A302 has two groups and their distribution is Two sets of extended dining boards B303 are located on either side of the first trough 304 on the left and right sides of the main table 301, and are distributed on either side of the second trough 305 on the front and rear sides of the main table 301. The two sets of extended dining boards A302 and B303 are slidably connected to the first trough 304 and the second trough 305, respectively, and locked in place by a ratchet module. The corners of both sets of extended dining boards A302 and B303 are designed in a circular arc shape. The extended dining boards B303 have a double-layer structure, including a lower plate, a support spring connected to the lower plate, and an upper plate connected to the support spring. The upper plate is shorter than the lower plate. The double-layer design of the extended dining boards B303 provides better support and stability. The lower and upper plates are connected by support springs, forming a floating structure. This not only ensures the stability of the dining boards but also provides better space utilization when stored. When the Extendable Dining Board B303 is unfolded, the spring provides support, ensuring the board is flat and at a consistent height, avoiding inconvenience caused by uneven heights. Furthermore, the Extendable Dining Board B303's floating structure compresses when stored, saving space while ensuring a flat and stable surface.

[0045] See also Figure 8 In this embodiment, the ratchet module includes a long rack 306, a gear 307, a ratchet, an elastic column 308 and a button 310, wherein the long rack 306 is arranged in the first groove body 304 and the second groove body 305 and is respectively connected to the extended dining board A302 and the lower plate body laterally, and the gear 307 is rotatably installed on the outside of the first groove body 304 and the second groove body 305, the gear 307 is engaged with the long rack 306, and the ratchet is coaxially connected to the gear 307; the button 310 is arranged on the diagonal side of the end face of the main table 301, and an elastic column 308 is provided at the lower end of the button 310, and the bottom end of the elastic column 308 extends to one side of the ratchet and is connected to a ratchet 309 that cooperates with the ratchet. When the button 310 is pressed, the ratchet 309 descends and separates from the ratchet, so that the extended dining board A302 and the lower plate body can slide freely along the first groove body 304 and the second groove body 305.

[0046] See also Figure 9 In combination with the above embodiment, the present invention also proposes the steps of using and storing the above dining board:

[0047] Instructions:

[0048] 1) When the patient needs to use the dining table, the control button 310 is used to control the motor 104 to drive the screw 105 to rotate. The rotation of the screw 105 drives the slide 107 to move. The slide 107 drives the slide 106 to slide up and down along the guide rail 103 through the linkage plate 108. The up and down movement of the slide 106 drives the flip and folding assembly 2 and the dining table assembly 3 upward, so that the dining table assembly 3 gradually rises to the required first height (the first height is the set height / reset height that satisfies the requirement that the flip and folding assembly 2 does not affect the end of the bed when unfolded or folded, and can also be continuously adjusted later by the control button 310)

[0049] 2) When the dining table assembly 3 reaches a predetermined height, the electric push rod 203 drives the support bracket 202 to flip from a folded state to a flat state, ensuring that the dining table is firmly supported on the foot of the bed or on the bed rails, providing space for the patient to dine;

[0050] 3) The width of the dining table can be adjusted according to the patient's needs through the extension dining board A302 and the extension dining board B303. The two sets of extension dining boards A302 and B303 are respectively connected to the first groove body 304 and the second groove body 305 of the main table plate 301 through a sliding structure. When adjusting, press the button 310 on the main table plate 301, the ratchet module will be unlocked, and the extension dining boards A302 and B303 can slide freely in the groove body and extend, expanding the width of the dining table and providing more dining space, which is particularly suitable for patients who need a larger space;

[0051] 4) To adjust the height of the dining table, the patient uses the control button 310 to adjust the dining board to move up or down to meet the usage needs.

[0052] Storage steps:

[0053] 1) The extended dining plate A302 and the extended dining plate B303 are stored inside the main table 301. When the extended dining plate A302 is stored, the ratchet module is unlocked by pressing the button 310 on the main table 301, and then the extended dining plate A302 is inserted into the first slot 304. When the extended dining plate B303 is stored, the upper plate must be compressed first to compress the support spring. At this time, the width of the upper and lower plates is reduced to match the width of the second slot 305. Then, the ratchet module is unlocked by pressing the button 310 on the main table 301, and the extended dining plate B303 can be stored in the second slot 305.

[0054] 2) After the two extended dining boards are stored, the patient controls the electric push rod 203 through the control button 310 to fold the support frame 202 from a flat state. The retraction action of the electric push rod 203 will push the support frame 202 to flip and fold relative to the T-shaped bracket 201, and the dining table will be folded. Then the dining table assembly 3 will descend with the slide 106, and the flipping and folding assembly 2 will be close to the end of the bed.

[0055] After the above steps, the dining table is completely stored and integrated into the design of the end of the bed, saving space and keeping the area around the bed tidy. At this time, the dining board is in a stored state and does not affect the use of the end of the bed or the activity space around the bed.

[0056] It is worth noting that the entire device is controlled by the control button 310, and the control button 310 can be connected to the dining plate using a wired / wireless connection. Since the device matched with the control button 310 is a common device and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure will not be repeated here.

[0057] All standard parts used in the present invention can be purchased commercially, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. In addition, the circuit connections adopt conventional connection methods in the prior art and will not be described in detail here. Any matters not described in detail in this specification belong to the prior art known to professionals in this field.

[0058] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A smart bed with a set of tableware, characterized in that: The dining board is arranged at the foot of the bed, and comprises a lifting assembly (1), a flipping and folding assembly (2) and a dining table assembly (3), wherein: The lifting assembly (1) comprises a support plate (101), a bolt base plate (102), a guide rail (103), a motor (104), a lead screw (105) and a slide (106). The support plate (101) is arranged vertically and has a long opening in the middle thereof. The bottom side of the support plate (101) is mounted on the bed frame at the end of the bed through the bolt base plate (102); the guide rail (103) and the lead screw (105) are respectively arranged on the front and rear sides of the support plate (101); the lower side shaft end of the lead screw (105) is connected to the motor (104), the upper side shaft end of the lead screw (105) is rotatably connected to the top of the support plate (101), and a slide (107) is arranged on the lead screw (105); the slide (106) is slidably mounted on the guide rail (103), and a T-shaped linkage plate (108) is arranged on one side of the slide (107); The flip and folding assembly (2) comprises a T-shaped bracket (201), a support bracket (202) and an electric push rod (203); the T-shaped bracket (201) is fixed to the linkage plate (108) by screws; the front end of the middle of the T-shaped bracket (201) is movably hinged to the support bracket (202); and the dining table assembly (3) is installed on the support bracket (202); The dining table assembly (3) comprises a main table plate (301), an extended dining plate A (302), and an extended dining plate B (303), wherein the main table plate (301) is provided with interpenetrating first grooves (304) along its left and right sides, and the main table plate (301) is provided with interpenetrating second grooves (305) along its front and rear sides.

2. The intelligent bed set meal plate according to claim 1, characterized in that: The linkage plate (108) passes through the long opening on the support plate (101) and is connected to the slide (106). The linkage plate (108) moves with the slide seat (107) and causes the slide (106) to move along the guide rail (103).

3. The intelligent bed set meal plate according to claim 1, characterized in that: The slotted height of the first trough body (304) on the main table (301) is higher than that of the second trough body (305); two groups of extended dining boards A (302) are provided and are distributed on both sides of the first trough body (304) on the left and right sides of the main table (301); two groups of extended dining boards B (303) are provided and are distributed on both sides of the second trough body (305) on the front and rear sides of the main table (301); the two groups of extended dining boards A (302) and extended dining boards B (303) are respectively slidably connected to the first trough body (304) and the second trough body (305) and are locked and limited by a ratchet module.

4. The intelligent bed set meal plate according to claim 1, characterized in that: The lower side of the T-shaped bracket (201) is hingedly mounted with an electric push rod (203), the front axial end of the electric push rod (203) is hingedly connected to the rear end of the support bracket (202), and the support bracket (202) moves with the electric push rod (203) and performs a flipping and folding action relative to the T-shaped bracket (201).

5. The intelligent bed set meal plate according to claim 3, characterized in that: The extended dining board B (303) is a double-layer structure, comprising a lower plate body, a support spring connected to the lower plate body, and an upper plate body connected to the support spring, wherein the length of the upper plate body is smaller than that of the lower plate body.

6. The intelligent bed set meal plate according to claim 3, characterized in that: The ratchet module comprises a long rack (306), a gear (307), a ratchet, an elastic column (308) and a button (310), wherein the long rack (306) is arranged in the first groove body (304) and the second groove body (305) and is respectively connected to the extended dining plate A (302) and the lower plate body in a laterally direction.

7. The intelligent bed set meal plate according to claim 6, characterized in that: The gear (307) is rotatably mounted on the outside of the first trough body (304) and the second trough body (305), the gear (307) is meshed with the long rack (306), and the gear (307) is coaxially connected to the ratchet.

8. The intelligent bed set meal plate according to claim 6, characterized in that: The button (310) is arranged at the diagonally opposite side of the end face of the main table (301), and an elastic column (308) is arranged at the lower end of the button (310). The bottom end of the elastic column (308) extends to one side of the ratchet and is connected to a ratchet (309) that cooperates with the ratchet. When the button (310) is pressed, the ratchet (309) moves downward and separates from the ratchet, so that the extended dining plate A (302) and the lower plate body can slide freely along the first groove body (304) and the second groove body (305).

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