Strap type schoolbag with hidden flying paddles

Abstract

The invention belongs to the technical field of strap type schoolbags, and particularly relates to a strap type schoolbag with hidden flying paddles, which comprises a hard board, a soft bag connected to the top of the hard board, a bottom shell detachably connected to the bottom of the hard board, a mounting shell placed in the bottom shell, and a battery and a controller electrically connected with the battery arranged in the mounting shell, and rotating columns are rotationally connected to the four corners of the bottom of the bottom shell correspondingly, mounting frames located outside the bottom shell are connected to the bottom ends of the rotating columns correspondingly, and electric paddles electrically connected with the controller are mounted on the mounting frames correspondingly. The motor drives the two-way lead screw to rotate, the four electric paddles are turned into an unfolded state, the electric paddles are controlled to generate lift force to enable the strap type schoolbag to fly, the weight borne by people is effectively reduced, the motor drives the two-way lead screw to rotate reversely, the four electric paddles are turned into a hidden state, the occupied space is reduced, the electric paddles are prevented from being damaged, and use and carrying are convenient. The practicability, the convenience and the safety of the strap type schoolbag are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of backpacks, and more specifically, relates to a backpack with hidden flying blades. Background Art

[0002] Backpacks are commonly used tools for students and some traveling people to carry items. Traditional backpacks only have the basic function of loading items. With the accelerating pace of people's lives and the increasing demand for convenience, their limitations in the process of use are gradually emerging.

[0003] Many people have a lot of learning materials, books and other items, resulting in a significant increase in the weight of the schoolbag. Carrying a heavy schoolbag for a long time will have an adverse impact on the human body, especially the spine and shoulders of teenagers, causing problems such as body pain and even affecting development. And in some special scenarios, such as traffic congestion or when you need to reach the destination quickly, ordinary schoolbags do not have additional auxiliary moving functions, which affect people's travel speed. Summary of the Invention

[0004] In order to solve the problems raised in the above background art, the present invention provides a backpack with hidden flying blades.

[0005] The technical solution is as follows: A backpack with hidden flying blades includes a hard board, a soft bag is connected to the top of the hard board, a bottom shell is detachably connected to the bottom of the hard board, an installation shell is placed inside the bottom shell, a battery and a controller electrically connected to the battery are arranged inside the installation shell, rotating columns are rotatably connected to the four corners of the bottom of the bottom shell, the bottom ends of the rotating columns are all connected with mounting brackets located outside the bottom shell, electric blades electrically connected to the controller are installed on the mounting brackets, and a driving mechanism for driving the rotating columns to rotate is arranged inside the bottom shell; when the rotating columns rotate, the electric blades directly below the bottom shell will move away from directly below the bottom shell, and the four hidden electric blades will change to the unfolded state.

[0006] Preferably, the hard board has a docking part extending into the inside of the bottom shell, at least one docking hole one is opened on both sides of the bottom shell, at least one docking hole two is opened on both sides of the hard board, the docking hole one and the docking hole two are aligned respectively, and fixing parts are installed through the docking hole one and the docking hole two.

[0007] Preferably, the driving mechanism includes guide bars, a bidirectional lead screw, sliding rods, rotating blocks and articulated rods. Two guide bars are connected to the inner bottom of the bottom shell, two sliding rods are arranged between the two guide bars, a bidirectional lead screw driven by a motor is rotatably connected to the inner bottom of the bottom shell, the two sliding rods are both threadedly connected to the bidirectional lead screw, when the bidirectional lead screw rotates, the two sliding rods slide in opposite directions, rotating blocks are connected to the rotating columns, articulated rods are rotatably connected between the left two rotating blocks and the two ends of the left sliding rod respectively, and articulated rods are rotatably connected between the right two rotating blocks and the two ends of the right sliding rod respectively.

[0008] Preferably, the backpack with hidden flying blades further includes limit posts and support rings. The mounting shell is provided with two grooves. Two pairs of limit posts are connected to the inner bottom of the bottom shell. Support rings are connected to the limit posts. The four limit posts are respectively located on both sides of the two grooves. The bottom of the mounting shell contacts the tops of the four support rings.

[0009] Preferably, the backpack with hidden flying blades further includes feet. Two pairs of feet are connected to the bottom of the bottom shell. The lowest points of the feet are lower than the lowest point of the mounting frame.

[0010] Preferably, the backpack with hidden flying blades further includes fixing straps, connecting blocks, rotating shafts, winding wheels, adjusting straps and a housing. Two fixing straps are connected to the top of the soft bag. Connecting blocks are connected to the hard board. Rotating shafts are rotatably connected to the connecting blocks. Winding wheels are connected to both ends of the rotating shafts. A housing is connected to the hard board. The housing covers the connecting blocks, rotating shafts and winding wheels. Adjusting straps are wound on the winding wheels. The adjusting straps pass through the housing and the side of the soft bag. The free ends of the two adjusting straps are respectively slidably inserted into the interiors of the two fixing straps.

[0011] Preferably, the backpack with hidden flying blades further includes a synchronization mechanism. The synchronization mechanism includes fixing blocks, sliders, translation rods and connecting sleeves. Fixing blocks are connected to the hard board. Two sliding sliders are provided on the fixing blocks. Springs are connected between the two sliders. Translation rods are connected to the sliders. Through holes for the translation rods to extend into are provided on both the hard board and the mounting shell. The bottoms of the two translation rods are located between the two sliding rods. A connecting sleeve is connected to the rotating shaft. Two symmetric threaded grooves are provided on the connecting sleeve. The tops of the two translation rods are respectively located in the two threaded grooves. When the two sliding rods approach each other, the two sliding rods will push the two translation rods to approach each other, so that the connecting sleeve, rotating shaft and winding wheel rotate together through the threaded grooves.

[0012] Preferably, the backpack with hidden flying blades further includes knobs and bolts. The lower ends of the fixing straps are made of rigid materials. Bolts are threadedly connected to the lower ends of the fixing straps. A row of round holes are evenly spaced at the free ends of the adjusting straps. The bolts are inserted into one of the round holes. Knobs are connected to the bolts.

[0013] Advantages of the present invention: 1. By driving the bidirectional lead screw to rotate by a motor, the four electric blades are changed to the unfolded state, and the electric blades are controlled to generate lift to make the backpack fly, effectively reducing the weight borne by people. By driving the bidirectional lead screw to reverse by the motor, the four electric blades are changed to the hidden state, reducing the occupied space and avoiding damage to the electric blades, being convenient to use and carry, and improving the practicability, convenience and safety of the backpack.

[0014] 2. When the four electric blades are unfolded, the winding wheel reels the adjusting belt through the synchronization mechanism, automatically and synchronously shortening the total length of the fixing belt and the adjusting belt; when the four electric blades are hidden, the winding wheel loosens the adjusting belt, automatically and synchronously lengthening the total length of the fixing belt and the adjusting belt, thereby realizing automatic and synchronous retraction and release of the adjusting belt.

[0015] 3. The four limit columns can limit the installation shell with grooves to ensure the stability of the installation shell. The installation shell is supported by four support rings, making it easy to take and put the installation shell.

[0016] 4. By turning the knob to make the bolt leave the round hole, the length of the free end of the adjusting belt inserted into the fixed belt can be adjusted. Reversing the knob to insert the bolt into another round hole can meet the needs of different people and is easy to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the structure after the middle soft package, bottom shell and cover shell are cut open.

[0019] Figure 3 It is a schematic structural diagram of the bottom shell, the mounting shell, the supporting feet, the limiting columns, the connecting blocks, the rotating shaft, the winding wheel and the synchronization mechanism of the present invention.

[0020] Figure 4 It is a schematic diagram of the matching relationship among the hard board, the bottom shell, the mounting shell and the limiting column of the present invention, wherein the hard board is cut open.

[0021] Figure 5 For the present invention Figure 3 Schematic diagram of the structure after the middle installation shell is hidden and the bottom shell is cut open.

[0022] Figure 6 It is a bottom view of the bottom shell, rotating column, mounting frame, electric blades and supporting feet of the present invention.

[0023] Figure 7 It is a top view of the bottom shell, rotating column and driving mechanism of the present invention.

[0024] Figure 8 It is a schematic diagram of the structure of the fixing belt, the connecting block, the rotating shaft, the winding wheel, the adjusting belt and the knob of the present invention.

[0025] Figure 9 It is a schematic diagram of the structure of the slide rod, the rotating shaft, the fixed block, the sliding block, the translation rod, the connecting sleeve and the winding wheel of the present invention, wherein the fixed block is cut away.

[0026] Figure 10 For the present invention Figure 9Top view after the middle slide bar is hidden.

[0027] Figure 11 Structural schematic diagram of the knob and bolt of the present invention.

[0028] Explanation of reference numerals: 1 - hard board, 2 - soft package, 3 - bottom shell, 31 - docking hole 1, 32 - docking hole 2, 33 - docking part, 4 - mounting shell, 41 - groove, 42 - limiting post, 43 - support ring, 5 - rotating column, 50 - guide bar, 51 - bidirectional lead screw, 52 - slide bar, 53 - rotating block, 54 - hinge rod, 6 - mounting bracket, 7 - electric paddle, 8 - support leg, 90 - cover shell, 91 - fixing belt, 92 - connecting block, 93 - rotating shaft, 931 - fixing block, 932 - slider, 933 - translation rod, 934 - connecting sleeve, 935 - thread groove, 94 - winding wheel, 95 - adjusting belt, 111 - knob, 112 - bolt. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the drawings and embodiments.

[0030] Embodiment 1: A backpack with a hidden flight paddle, referring to Figures 1 - 7 , including a hard board 1, a soft package 2, a bottom shell 3, a mounting shell 4, a rotating column 5, a driving mechanism, a mounting bracket 6 and an electric paddle 7. The top of the hard board 1 is connected with the soft package 2. In this embodiment, a positioning system is built in the hard board 1, and the backpack has the functions of connecting to a mobile phone application and navigation, which are specific to the existing technology. The bottom of the hard board 1 is detachably connected with the bottom shell 3. An installation shell 4 is placed inside the bottom shell 3. The installation shell 4 is internally provided with a battery and a controller electrically connected to the battery. The four corners of the bottom of the bottom shell 3 are all rotatably connected with a rotating column 5. The bottom ends of the rotating columns 5 are all fixedly connected with a mounting bracket 6 located outside the bottom shell 3. Electric paddles 7 electrically connected to the controller are installed on the mounting brackets 6 respectively. The structure and the principle of generating lift of the electric paddles 7 are prior arts. A driving mechanism for driving the rotation of the rotating column 5 is arranged inside the bottom shell 3. When the rotating column 5 rotates, the electric paddle 7 located directly below the bottom shell 3 will move away from directly below the bottom shell 3, and the four hidden electric paddles 7 will change to the unfolded state. The bottom of the hard board 1 has a docking part 33 extending into the interior of the bottom shell 3. Two docking holes 1 31 are opened on both the left and right sides of the bottom shell 3, and two docking holes 2 32 are opened on both the left and right sides of the hard board 1. The two docking holes 1 31 and the two docking holes 2 32 are respectively aligned. Fixing parts are installed through the docking holes 1 31 and the docking holes 2 32. The fixing parts are prior arts. In this embodiment, the fixing parts are specifically screws.

[0031] Referring to Figure 5 and Figure 7, the driving mechanism includes guide bars 50, a bidirectional lead screw 51, sliding rods 52, rotating blocks 53 and articulated rods 54. Two parallel guide bars 50 are fixedly connected to the inner bottom of the bottom shell 3. Between the two guide bars 50, there are two sliding rods 52 that slide left and right. The inner bottom of the bottom shell 3 is rotatably connected to a bidirectional lead screw 51 driven by a motor. Both sliding rods 52 are threadedly connected to the bidirectional lead screw 51. When the bidirectional lead screw 51 rotates, the two sliding rods 52 slide in opposite directions. Rotating blocks 53 are connected to the rotating columns 5. Articulated rods 54 are rotatably connected between the left and right rotating blocks 53 and the two ends of the left and right sliding rods 52 respectively.

[0032] Reference Figure 3 , Figure 4 , Figure 5 and Figure 7 , the backpack with hidden flying propellers further includes limit posts 42 and support rings 43. Grooves 41 are formed on the front and rear sides of the installation shell 4. Two pairs of limit posts 42 are connected to the inner bottom of the bottom shell 3. Support rings 43 are fixedly connected to the middle parts of the limit posts 42. The four limit posts 42 are respectively located on the left and right sides of the two grooves 41. The bottom of the installation shell 4 contacts the tops of the four support rings 43.

[0033] Reference Figures 1 - 3 , the backpack with hidden flying propellers further includes support feet 8. Two pairs of support feet 8 are fixedly connected to the bottom of the bottom shell 3. The lowest points of the support feet 8 are lower than the lowest points of the installation frame 6.

[0034] Reference Figure 1 , Figure 2 , Figure 3 and Figure 8 , the backpack with hidden flying propellers further includes fixing straps 91, connecting blocks 92, rotating shafts 93, winding wheels 94, adjusting straps 95 and a housing 90. Two fixing straps 91 are fixedly connected to the top of the soft bag 2. A connecting block 92 is fixedly connected to the front side of the top of the hard board 1. A rotating shaft 93 is rotatably connected to the connecting block 92. Winding wheels 94 are fixedly connected to the left and right ends of the rotating shaft 93. A housing 90 is fixedly connected to the top of the hard board 1. The housing 90 covers the connecting block 92, the rotating shaft 93 and the winding wheels 94. Adjusting straps 95 are wound on the winding wheels 94. The adjusting straps 95 pass through the front side of the housing 90 and the front side of the soft bag 2. The free ends of the two adjusting straps 95 are slidably inserted into the interiors of the two fixing straps 91 respectively.

[0035] Reference Figure 2 , Figure 3 , Figure 9 and Figure 10, the backpack with hidden flying blades further includes a synchronization mechanism, which includes a fixed block 931, a slider 932, a translation rod 933 and a connecting sleeve 934. A fixed block 931 is fixedly connected to the top of the hard board 1. There are two sliders 932 sliding left and right on the fixed block 931. A spring is fixedly connected between the two sliders 932. Translation rods 933 are fixedly connected to the sliders 932. Through holes for the bottom ends of the translation rods 933 to extend into are respectively opened in the middle of the hard board 1 and the installation shell 4. The bottom ends of the two translation rods 933 are located between the two sliding rods 52. A connecting sleeve 934 is fixedly connected to the rotating shaft 93. Two symmetric threaded grooves 935 are opened on the connecting sleeve 934. The top ends of the two translation rods 933 are respectively located in the two threaded grooves 935. When the two sliding rods 52 approach each other in the left-right direction, the two sliding rods 52 will push the two translation rods 933 closer to each other, so that the connecting sleeve 934, the rotating shaft 93 and the winding wheel 94 rotate together through the threaded grooves 935.

[0036] First of all, the backpack can be placed on the tabletop. The support feet 8 are in contact with the tabletop. The support feet 8 play a supporting role to ensure the stability of the backpack when it is placed and prevent the mounting frame 6 and the electric blades 7 from being damaged. The hard board 1 is docked with the bottom shell 3 through the docking part 33, so that the first docking hole 31 and the second docking hole 32 are aligned, and then the hard board 1 and the bottom shell 3 are fixed through fixing parts (such as screws), realizing the detachable connection between the hard board 1 and the bottom shell 3, so as to maintain the battery and the controller in the bottom shell 3. The installation shell 4 with grooves 41 can be limited by four limit posts 42 to prevent the installation shell 4 from moving and ensure the stability of the installation shell 4. The installation shell 4 is supported by four support rings 43 and is convenient to take and place.

[0037] When the backpack needs to be used, the adjusting belt 95 is in a state of not being wound by the winding wheel 94. The total length of the fixing belt 91 and the adjusting belt 95 is longer, which is convenient for people to carry on the fixing belt 91 and the adjusting belt 95. The controller controls the motor to drive the bidirectional lead screw 51 to rotate. The battery supplies power to the motor. Under the action of threaded connection, the two sliding rods 52 approach each other along the guide bar 50. Under the transmission action of the hinge rod 54, the rotating block 53 and the rotating column 5 rotate together, so as to Figure 5 Taking the

[0038] During the process of the two sliding rods 52 approaching each other, the two sliding rods 52 will push the two translation rods 933 closer to each other in the left - right direction, driving the two sliders 932 closer to each other, compressing the spring. Since the tops of the two translation rods 933 are respectively located in the two threaded grooves 935, the moving translation rods 933 can make the connecting sleeve 934 rotate through the threaded grooves 935, driving the rotating shaft 93 and the winding wheel 94 to rotate together. The two winding wheels 94 respectively wind the two adjusting belts 95, thus automatically and synchronously shortening the total length of the fixed belt 91 and the adjusting belt 95, which is convenient for adjustment. Then, the controller controls the electric paddle 7 to generate lift force to make the backpack fly, effectively reducing the weight borne by people. The backpack has an additional auxiliary moving function, effectively improving people's travel speed.

[0039] When the backpack is not needed to be carried, the controller controls the motor to drive the bidirectional lead screw 51 to rotate reversely. Under the action of threaded connection, the two sliding rods 52 move away from each other. Driven by the articulated rod 54, the rotating block 53, the rotating column 5, the mounting bracket 6 and the electric paddle 7 rotate reversely and reset together. The four electric paddles 7 are hidden directly below the bottom shell 3, and the four electric paddles 7 become hidden, reducing the occupied space and avoiding damage to the electric paddles 7, which is convenient for use and carrying, improving the practicality, convenience and safety of the backpack. At the same time, the two sliding rods 52 no longer push the two translation rods 933, the spring resumes its original state, the two sliders 932 move away from each other, driving the two translation rods 933 to move away from each other in the left - right direction. The translation rods 933 make the connecting sleeve 934 reverse and reset through the threaded grooves 935, driving the rotating shaft 93 and the winding wheel 94 to reverse and reset together. The two winding wheels 94 respectively loosen the two adjusting belts 95, automatically and synchronously lengthening the total length of the fixed belt 91 and the adjusting belt 95, facilitating people to put down the backpack and realizing the automatic synchronous winding and unwinding of the adjusting belt 95.

[0040] Embodiment 2: On the basis of Embodiment 1, referring to Figure 1 、 Figure 2 、 Figure 8 and Figure 11 ,the backpack with hidden flying paddles further includes a knob 111 and a bolt 112. The lower end of the fixed belt 91 is made of a rigid material, and bolts 112 are threadedly connected to the lower ends of the fixed belt 91. A row of round holes are evenly spaced at the free end of the adjusting belt 95, and the rear end of the bolt 112 is inserted into one of the round holes, and the front end of the bolt 112 is fixedly connected with a knob 111.

[0041] When different people use the backpack with straps, by turning the knob 111, the bolt 112 moves forward and leaves the round hole, and then the adjustment strap 95 can be pulled to adjust the length of the free end of the adjustment strap 95 inserted into the fixing strap 91. Then, reverse the knob 111 to move the bolt 112 backward and insert it into another round hole to fix the free end of the adjustment strap 95, so as to meet the usage requirements of different people and the adjustment is convenient.

[0042] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A backpack with a hidden flying blade, comprising a hard board (1), a soft bag (2) connected to the top of the hard board (1), characterized in that: The bottom of the hard board (1) is detachably connected to a bottom shell (3), a mounting shell (4) is placed inside the bottom shell (3), a battery and a controller electrically connected to the battery are built into the mounting shell (4), the four corners of the bottom of the bottom shell (3) are rotatably connected to rotating columns (5), the bottom ends of the rotating columns (5) are connected to mounting frames (6) located outside the bottom shell (3), the mounting frames (6) are mounted with electric propellers (7) electrically connected to the controller, and a driving mechanism for driving the rotating columns (5) to rotate is provided inside the bottom shell (3); when the rotating columns (5) rotate, the electric propellers (7) located directly below the bottom shell (3) will leave the bottom of the bottom shell (3), and the four electric propellers (7) in a hidden state will become unfolded.

2. A backpack with hidden flying blades according to claim 1, characterized in that: The hard plate (1) has a docking portion (33) extending into the interior of the bottom shell (3), at least one docking hole (31) is formed on both sides of the bottom shell (3), at least one docking hole (32) is formed on both sides of the hard plate (1), the docking holes (31) are aligned with the docking holes (32) respectively, and a fixing member is installed through the docking holes (31) and the docking holes (32).

3. A backpack with hidden flying blades according to claim 2, characterized in that: The driving mechanism comprises a guide bar (50), a bidirectional screw rod (51), a slide rod (52), a rotating block (53) and a hinged rod (54); the bottom of the bottom shell (3) is connected to two guide bars (50); two sliding slide rods (52) are arranged between the two guide bars (50); the bottom of the bottom shell (3) is rotatably connected to a bidirectional screw rod (51) driven by a motor; the two slide rods (52) are both threadedly connected to the bidirectional screw rod (51); when the bidirectional screw rod (51) rotates, the two slide rods (52) slide in opposite directions; the rotating column (5) is connected to a rotating block (53); the two rotating blocks (53) on the left side are respectively rotatably connected to the two ends of the left slide rod (52) with a hinged rod (54); the two rotating blocks (53) on the right side are respectively rotatably connected to the two ends of the right slide rod (52) with a hinged rod (54).

4. A backpack with hidden flying blades according to claim 3, characterized in that: The backpack with hidden flying blades further comprises a limiting column (42) and a supporting ring (43); the mounting shell (4) is provided with two grooves (41); the bottom of the bottom shell (3) is connected with two pairs of limiting columns (42); the limiting columns (42) are connected with supporting rings (43); the four limiting columns (42) are respectively located on both sides of the two grooves (41); the bottom of the mounting shell (4) is in contact with the tops of the four supporting rings (43).

5. A backpack with hidden flying blades according to claim 4, characterized in that: The backpack with hidden flying blades also includes supporting feet (8), the bottom of the bottom shell (3) is connected to two pairs of supporting feet (8), and the lowest point of the supporting feet (8) is lower than the lowest point of the mounting frame (6).

6. A backpack with hidden flying blades according to claim 5, characterized in that: The backpack with a hidden flying blade further comprises a fixing strap (91), a connecting block (92), a rotating shaft (93), a winding wheel (94), an adjusting strap (95) and a cover shell (90). The top of the soft bag (2) is connected to two fixing straps (91). The hard board (1) is connected to a connecting block (92). The connecting block (92) is rotatably connected to a rotating shaft (93). Both ends of the rotating shaft (93) are connected to winding wheels (94). The hard board (1) is connected to a cover shell (90). The cover shell (90) covers the connecting block (92), the rotating shaft (93) and the winding wheel (94). The winding wheel (94) is wound with an adjusting strap (95). The adjusting strap (95) passes through the cover shell (90) and the side of the soft bag (2). The free ends of the two adjusting straps (95) are respectively slidably inserted into the interior of the two fixing straps (91).

7. A backpack with hidden flying blades according to claim 6, characterized in that: The backpack with hidden flying blades also includes a synchronization mechanism, the synchronization mechanism including a fixed block (931), a slider (932), a translation rod (933) and a connecting sleeve (934), the hard plate (1) is connected to the fixed block (931), the fixed block (931) is provided with two sliding sliders (932), a spring is connected between the two sliders (932), the sliders (932) are connected to the translation rod (933), and the hard plate (1) and the mounting shell (4) are both provided with passages for the translation rod (933) to extend into. The bottom ends of the two translation rods (933) are located between the two sliding rods (52); the rotating shaft (93) is connected with a connecting sleeve (934); the connecting sleeve (934) is provided with two symmetrical thread grooves (935); the top ends of the two translation rods (933) are respectively located in the two thread grooves (935); when the two sliding rods (52) are close to each other, the two sliding rods (52) will push the two translation rods (933) close to each other, so that the connecting sleeve (934), the rotating shaft (93) and the winding wheel (94) rotate together through the thread grooves (935).

8. The backpack with hidden flying blades according to claim 7, characterized in that: The backpack with a hidden flying blade further comprises a knob (111) and a bolt (112); the lower end of the fixing belt (91) is made of a hard material; the lower end of the fixing belt (91) is threadedly connected with a bolt (112); the free end of the adjustment belt (95) is provided with a row of circular holes at even intervals; the bolt (112) is inserted into one of the circular holes; and the bolt (112) is connected with a knob (111).

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