A desk with adjustable tabletop size

Abstract

The present invention relates to a desk, and in particular to a desk with an adjustable desktop size. The technical problem of the present invention is to provide a desk with an adjustable desktop size that can hold more books and is convenient for students to study. A desk with an adjustable desktop size includes a base frame, a desktop board, a desk bottom board, etc. The top of the base frame is connected to the desktop board, and the bottom of the desktop board is connected to the desk bottom board. When students need to use a lot of books, they can push the U-shaped push rod backwards, and the U-shaped push rod can drive the push frame to move backwards, swing the second connecting plate upwards and unfold it, and the students can place the books on the second connecting plate, which is convenient for students to study; the U-shaped push rod can move backwards and pass over the second wedge-shaped block. After passing over the second wedge-shaped block, the second wedge-shaped block can block the U-shaped push rod to prevent the weight of the book from being insufficient to press down the push frame, causing the push frame to move forward and reset under the action of the second spring.

Description

Technical Field

[0001] The invention relates to a desk, in particular to a desk with an adjustable tabletop size. Background Art

[0002] A desk is a table used by students in class to place books and other teaching materials. With the continuous development of technology, there are more and more styles of desks.

[0003] Patent application number CN201220650935.0 discloses a new type of desk, including a desk body, a desk top arranged above the desk body, a hinge arranged on the desk top, a bracket arranged below the desk body, and bolts arranged on the bracket. The desk body and the desk top are connected by hinges, the desk body and the bracket are connected by bolts, the desk top has two pieces, and is respectively connected to the desk body, a desk cavity is arranged below the desk top, and there are more than two bolts on the bracket.

[0004] The desk is divided into two desk panels, so it is very convenient to open, saves time, has a simple structure, and has a low manufacturing cost, so it is suitable for promotion in daily life. However, the desk panel of the desk cannot be widened, and when students need to use more books, more books cannot be placed on the desk panel, which is not conducive to students' learning. Summary of the invention

[0005] In order to overcome the disadvantage that when students need to use more books, the desk top cannot accommodate more books and has certain limitations, the technical problem of the present invention is to provide a desk with an adjustable desktop size that can hold more books and is convenient for students to study.

[0006] Technical solution: A desk with an adjustable desktop size, including a base frame, a desktop panel, a table bottom plate, a widening component and a pushing component. The top of the base frame is connected to the desktop panel, the bottom of the desktop panel is connected to the table bottom plate, the widening component is installed on the rear side of the table bottom plate, and the pushing component for driving the widening component is installed at the bottom of the desktop panel.

[0007] In one embodiment, the widening component includes a first connecting plate, a second connecting plate, a first spring and a first torsion spring. The first connecting plate is slidably provided on the rear bottom side of the desktop panel. The first spring is connected between the left and right sides of the first connecting plate and the bottom plate of the desktop. The second connecting plate for placing books is rotatably connected to the rear side of the first connecting plate. The top of the second connecting plate is in contact with the bottom of the desktop panel. The first torsion spring is wound around the left and right parts of the second connecting plate. The two ends of the first torsion spring are respectively connected to the first connecting plate and the second connecting plate.

[0008] In one embodiment, the pushing assembly includes a first guide rail, a pushing frame, a second spring and a U-shaped push rod. The first guide rails are connected to the left and right sides of the table bottom plate. A pushing frame for pushing the second connecting plate is slidably provided between the two first guide rails. The top of the pushing frame is in contact with the bottom of the first connecting plate. The second spring is wound around the two first guide rails. The two ends of the second spring are respectively connected to the first guide rail and the pushing frame. A U-shaped push rod is connected to the middle of the front side of the pushing frame.

[0009] In one of the embodiments, a clamping assembly is also included, which includes a second guide rail, a third spring and a first wedge-shaped block. Two second guide rails are connected to the middle of the lower rear part of the table bottom plate. The two second guide rails are symmetrically arranged. The two second guide rails are both slidably provided with a first wedge-shaped block for clamping the second connecting plate. The two second guide rails are both wound with a third spring, and the two ends of the third spring are respectively connected to the first wedge-shaped block and the table bottom plate.

[0010] In one of the embodiments, an opening component is also included, which includes a third guide rail, a fourth spring, a first connecting rod, a trapezoidal block and a fifth spring. The third guide rails are slidably provided on the left and right sides of the lower part of the pushing frame, the first connecting rod is connected between the rear ends of the two third guide rails, the fourth spring is wound around the two third guide rails, the two ends of the fourth spring are respectively connected to the first connecting rod and the pushing frame, the middle part of the rear side of the first connecting rod is connected to a trapezoidal block for pushing the first wedge-shaped block, the two first wedge-shaped blocks are in contact with the trapezoidal block, and the fifth spring is connected between the trapezoidal block and the bottom plate of the table.

[0011] In one of the embodiments, a blocking assembly is also included, which includes a guide sleeve, a second wedge-shaped block, a sixth spring, a pull wire, a pull rod and a connecting block. The guide sleeve is connected to the upper rear side of the table bottom plate, and a second wedge-shaped block for clamping the U-shaped push rod is slidably provided in the guide sleeve. The top of the second wedge-shaped block contacts the bottom of the first connecting plate. When the push frame moves backward, it contacts the second wedge-shaped block. A sixth spring is connected between the bottom of the second wedge-shaped block and the bottom of the guide sleeve. A pull wire is connected to the bottom of the second wedge-shaped block, and the pull wire passes through the bottom of the guide sleeve. A pull rod is slidably provided in the middle of the bottom of the push frame, and the pull wire passes through the rear of the pull rod. A connecting block is connected to the rear side of the bottom of the table bottom plate, and the bottom end of the pull wire is connected to the top of the connecting block.

[0012] In one embodiment, a rotating assembly is also included, which includes a second connecting rod, a second torsion spring and a third connecting rod. The front end of the pull rod is rotatably connected to the second connecting rod, the front end of the second connecting rod is connected to the third connecting rod, the second connecting rod is wound with a second torsion spring, and the two ends of the second torsion spring are respectively connected to the pull rod and the third connecting rod.

[0013] In one of the embodiments, two slots are formed at the lower front portion of the second connecting plate, and the two first wedge-shaped blocks are respectively located in the two slots.

[0014] Compared with the prior art, the present invention has the following advantages: 1. When students need to use a lot of books, they can push the U-shaped push rod backward, and the U-shaped push rod can drive the push frame to move backward, swing the second connecting plate upward and unfold it, and students can place the books on the second connecting plate, which is convenient for students to study.

[0015] 2. When the second connecting plate swings downward to a vertical state, the first wedge-shaped block will enter the slot to clamp the second connecting plate to prevent the second connecting plate from being abnormally unfolded.

[0016] 3. The U-shaped push rod can move backward and pass over the second wedge-shaped block. After passing over the second wedge-shaped block, the second wedge-shaped block can block the U-shaped push rod to prevent the push frame from moving forward and resetting under the action of the second spring due to insufficient weight of the book to press down the push frame. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the widening component of the present invention.

[0020] Figure 4 It is a schematic diagram of the enlarged three-dimensional structure of point A of the present invention.

[0021] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the pushing assembly of the present invention.

[0022] Figure 6 It is a schematic diagram of the enlarged three-dimensional structure of point B of the present invention.

[0023] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the clamping assembly of the present invention.

[0024] Figure 8 It is a schematic diagram of the enlarged three-dimensional structure of point C of the present invention.

[0025] Fig. 9 It is a schematic cross-sectional three-dimensional structure diagram of an opened component of the present invention.

[0026] Fig.10 It is a schematic diagram of the enlarged three-dimensional structure of point D of the present invention.

[0027] Fig.11 It is a schematic diagram of the cross-sectional three-dimensional structure of the barrier assembly of the present invention.

[0028] Fig.12 This is a schematic diagram of the enlarged three-dimensional structure of location E of the present invention.

[0029] Fig.13 It is a schematic diagram of the cross-sectional three-dimensional structure of the rotating assembly of the utility model.

[0030] Fig.14 It is a schematic diagram of the enlarged three-dimensional structure of F of the present invention.

[0031] Marked in the figure: 1-base frame, 2-desktop plate, 3-desk bottom plate, 4-widening component, 41-first connecting plate, 42-second connecting plate, 43-first spring, 44-first torsion spring, 5-pushing component, 51-first guide rail, 52-pushing frame, 53-second spring, 54-U-shaped push rod, 6-clamping component, 61-second guide rail, 62-third spring, 63-first wedge-shaped block, 7-opening component, 71-third guide rail, 72-fourth spring, 73-first connecting rod, 74-trapezoidal block, 75-fifth spring, 8-blocking component, 81-guide sleeve, 82-second wedge-shaped block, 83-sixth spring, 84-pull wire, 85-pull rod, 86-connecting block, 9-rotating component, 91-second connecting rod, 92-second torsion spring, 93-third connecting rod. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0033] Example 1

[0034] A desk with adjustable desktop size, such as Figure 1-6 As shown, it includes a base frame 1, a desktop panel 2, a table bottom plate 3, a widening component 4 and a pushing component 5. The top of the base frame 1 is connected to the desktop panel 2 by bolts, the bottom of the desktop panel 2 is connected to the table bottom plate 3 by bolts, the widening component 4 is installed on the rear side of the table bottom plate 3 and the pushing component 5 is installed on the bottom of the desktop panel 2, and the pushing component 5 is used to drive the widening component 4.

[0035] like Figure 2-4 As shown, the widening component 4 includes a first connecting plate 41, a second connecting plate 42, a first spring 43 and a first torsion spring 44. The first connecting plate 41 is slidably provided on the rear bottom side of the desktop panel 2. The first spring 43 is connected between the left and right sides of the first connecting plate 41 and the table bottom plate 3. The second connecting plate 42 is rotatably connected to the rear side of the first connecting plate 41. The second connecting plate 42 is used for placing books. The top of the second connecting plate 42 is in contact with the bottom of the desktop panel 2. The left and right parts of the second connecting plate 42 are both wound with the first torsion spring 44. One end of the first torsion spring 44 is connected to the first connecting plate 41, and the other end of the first torsion spring 44 is connected to the second connecting plate 42.

[0036] like Figure 5-6As shown, the pushing assembly 5 includes a first guide rail 51, a pushing frame 52, a second spring 53 and a U-shaped push rod 54. The first guide rails 51 are connected to the left and right sides of the table bottom plate 3. A pushing frame 52 is slidably provided between the two first guide rails 51. The pushing frame 52 is used to push the second connecting plate 42. The top of the pushing frame 52 is in contact with the bottom of the first connecting plate 41. The two first guide rails 51 are both wound with a second spring 53. One end of the second spring 53 is connected to the first guide rail 51, and the other end of the second spring 53 is connected to the pushing frame 52. A U-shaped push rod 54 is connected to the middle of the front side of the pushing frame 52.

[0037] Initially, the first torsion spring 44 is in a twisted state, and the student can put the book on the table bottom plate 3 or on the table top plate 2. When the table top plate 2 cannot hold the book, the student pushes the U-shaped push rod 54 backward, and the U-shaped push rod 54 drives the pushing frame 52 to move backward, the second spring 53 is stretched, and the pushing frame 52 drives the second connecting plate 42 to move backward, and the second connecting plate 42 drives the first connecting plate 41 to move backward, and the first spring 43 is stretched. When the second connecting plate 42 and the table top plate 2 are not in contact, under the action of the first torsion spring 44, the second connecting plate 42 swings upward, and the student can put the book on the second connecting plate 42. At this time, the student continues to push the U-shaped push rod 54 backward, and the pushing frame 52 continues to move backward. The pushing frame 52 can support the second connecting plate 42. At the same time, the book presses the second connecting plate 42, and the second connecting plate 42 presses the pushing frame 52, so the pushing frame 52 will not reset forward under the action of the second spring 53. When the second connecting plate 42 needs to be folded up, the student pushes the U-shaped push rod 54 and then takes the book off the second connecting plate 42. The book no longer presses the second connecting plate 42, and the second connecting plate 42 no longer presses the pushing frame 52. The student releases the U-shaped push rod 54, and under the action of the second spring 53, the pushing frame 52 moves forward and resets. The student presses the second connecting plate 42 downward again, and the first torsion spring 44 twists and rolls. When the second connecting plate 42 rotates to a vertical state, the desktop panel 2 no longer blocks the second connecting plate 42. Under the action of the first spring 43, the first connecting plate 41 moves forward and resets, and the first connecting plate 41 drives the second connecting plate 42 to reset forward. At this time, the desktop panel 2 blocks the second connecting plate 42, so that the second connecting plate 42 will not swing upward under the action of the first torsion spring 44.

[0038] Example 2

[0039] On the basis of Example 1, Figure 7-8As shown, it also includes a clamping assembly 6, which includes a second guide rail 61, a third spring 62 and a first wedge-shaped block 63. Two second guide rails 61 are connected to the middle of the lower rear part of the table bottom plate 3, and the two second guide rails 61 are symmetrically arranged. The two second guide rails 61 are both slidably provided with a first wedge-shaped block 63, and the first wedge-shaped block 63 is used to clamp the second connecting plate 42. Two grooves are opened in the lower front part of the second connecting plate 42, and the two grooves are symmetrically arranged. The two first wedge-shaped blocks 63 are respectively located in the two grooves. The two second guide rails 61 are both wound with a third spring 62, one end of the third spring 62 is connected to the first wedge-shaped block 63, and the other end of the third spring 62 is connected to the table bottom plate 3.

[0040] like Figure 9-10 As shown, an opening component 7 is also included, and the opening component 7 includes a third guide rail 71, a fourth spring 72, a first connecting rod 73, a trapezoidal block 74 and a fifth spring 75. The third guide rails 71 are slidably provided on the left and right sides of the lower part of the pushing frame 52, and the first connecting rod 73 is connected between the rear ends of the two third guide rails 71. The fourth spring 72 is wound around the two third guide rails 71, one end of the fourth spring 72 is connected to the first connecting rod 73, and the other end of the fourth spring 72 is connected to the pushing frame 52. A trapezoidal block 74 is connected to the middle part of the rear side of the first connecting rod 73, and the trapezoidal block 74 is used to push the first wedge-shaped block 63. The two first wedge-shaped blocks 63 are in contact with the trapezoidal block 74, and a fifth spring 75 is connected between the trapezoidal block 74 and the table bottom plate 3.

[0041] The first wedge-shaped block 63 is located in the card slot, which clamps the second connecting plate 42 to prevent the second connecting plate 42 from expanding abnormally. When the pushing frame 52 moves backward, the pushing frame 52 drives the first connecting rod 73 to move backward through the fourth spring 72, and the first connecting rod 73 drives the trapezoidal block 74 to move backward. The fifth spring 75 is compressed, and the trapezoidal block 74 pushes the first wedge-shaped block 63 to move outward. The third spring 62 is compressed, and the first wedge-shaped block 63 releases the second connecting plate 42 so that the second connecting plate 42 can swing upward and expand. When the first connecting rod 73 moves backward and contacts the table bottom plate 3, the first connecting rod 73 stops moving backward, and the pushing frame 52 continues to move backward. The fourth spring 72 is compressed, and when the pushing frame 52 moves forward, the fourth spring 75 is compressed. The spring 72 returns to its original state. After the fourth spring 72 has completely returned to its original state, the fourth spring 72 drives the first connecting rod 73 to move forward, the fifth spring 75 returns to its original state, the first connecting rod 73 drives the trapezoidal block 74 to move forward, the trapezoidal block 74 and the first wedge block 63 are not in contact, and the first wedge block 63 moves inward and resets under the action of the third spring 62. When the second connecting plate 42 swings downward, the first wedge block 63 enters the slot, the second connecting plate 42 touches the first wedge block 63, the first wedge block 63 moves outward, and the third spring 62 is compressed. When the second connecting plate 42 swings downward to a vertical state, the first wedge block 63 moves inward and resets under the action of the third spring 62, and the second connecting plate 42 is clamped.

[0042] like Figure 11-12 As shown, it also includes a blocking component 8, which includes a guide sleeve 81, a second wedge-shaped block 82, a sixth spring 83, a pull wire 84, a pull rod 85 and a connecting block 86. The guide sleeve 81 is connected to the upper rear side of the table bottom plate 3, and a second wedge-shaped block 82 is slidably provided in the guide sleeve 81. The second wedge-shaped block 82 is used to clamp the U-shaped push rod 54. The top of the second wedge-shaped block 82 contacts the bottom of the first connecting plate 41. The pushing frame 52 moves backward and contacts the second wedge-shaped block 82. The sixth spring 83 is connected between the bottom of the second wedge-shaped block 82 and the bottom of the guide sleeve 81. The bottom of the second wedge-shaped block 82 is connected to a pull wire 84, and the pull wire 84 passes through the bottom of the guide sleeve 81. A pull rod 85 is slidably provided in the middle of the bottom of the pushing frame 52, and the pull wire 84 passes through the rear of the pull rod 85. A connecting block 86 is connected to the rear side of the bottom of the table bottom plate 3, and the bottom end of the pull wire 84 is connected to the top of the connecting block 86.

[0043] like Figure 13-14 As shown, it also includes a rotating component 9, which includes a second connecting rod 91, a second torsion spring 92 and a third connecting rod 93. The second connecting rod 91 is rotatably provided at the front end of the pull rod 85, and the third connecting rod 93 is connected to the front end of the second connecting rod 91. The second torsion spring 92 is wound around the second connecting rod 91, one end of the second torsion spring 92 is connected to the pull rod 85, and the other end of the second torsion spring 92 is connected to the third connecting rod 93.

[0044] When the pushing frame 52 moves backward and touches the second wedge block 82, the pushing frame 52 pushes the second wedge block 82 to move downward, the sixth spring 83 is compressed, and the pushing frame 52 continues to move backward, and the U-shaped push rod 54 will contact the second wedge block 82. When the U-shaped push rod 54 and the second wedge block 82 are not in contact, the second wedge block 82 moves upward and resets under the action of the sixth spring 83, and the second wedge block 82 blocks the U-shaped push rod 54 to prevent the weight of the book from being insufficient to press down the pushing frame 52, causing the pushing frame 52 to move forward and reset under the action of the second spring 53. When the second connecting plate 42 needs to be retracted, the student rotates the third connecting rod 93 downward to rotate the third connecting rod 93 to a vertical position. The second torsion spring 92 is twisted and then pulls the third connecting rod 93 forward, and the third connecting rod 93 drives the second connecting rod 91 to move forward, and the second connecting rod 91 drives the pull rod 85 to move forward, and the pull rod 85 pulls the pull wire 84, and the pull wire 84 pulls the second wedge block 82 to move downward, and the sixth spring 83 is compressed, and the second wedge block 82 no longer blocks the U-shaped push rod 54, and the U-shaped push rod 54 moves forward and resets under the action of the second spring 53, and the student releases the third connecting rod 93 again, and the third connecting rod 93 rotates upward and resets under the action of the second torsion spring 92, and the second wedge block 82 moves upward and resets under the action of the sixth spring 83, and the pull wire 84 is straightened, so that the pull rod 85 moves backward and resets.

[0045] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A desk with an adjustable desktop size, comprising a base frame (1), a desktop panel (2) and a desk bottom panel (3), wherein the top of the base frame (1) is connected to the desktop panel (2), and the bottom of the desktop panel (2) is connected to the desk bottom panel (3), wherein: The invention also comprises a widening component (4) and a pushing component (5); the widening component (4) is installed on the rear sides of the table bottom plate (3) and the table top plate (2); the pushing component (5) for driving the widening component (4) is installed on the bottom of the table top plate (2); the widening component (4) comprises a first connecting plate (41), a second connecting plate (42), a first spring (43) and a first torsion spring (44); the first connecting plate (41) is slidably provided on the rear side of the bottom of the table top plate (2); the first connecting plate (41) is connected to the table bottom plate (3) on both sides thereof; a spring (43); a second connecting plate (42) for placing books is rotatably connected to the rear side of the first connecting plate (41); the top of the second connecting plate (42) contacts the bottom of the desktop plate (2); a first torsion spring (44) is wound around the left and right parts of the second connecting plate (42); two ends of the first torsion spring (44) are respectively connected to the first connecting plate (41) and the second connecting plate (42); a pushing component (5) comprises a first guide rail (51), a pushing frame (52), a second spring (53) and a U-shaped push rod (54); the desktop bottom plate (3) The left and right sides are connected to the first guide rails (51), a push frame (52) for pushing the second connecting plate (42) is slidably provided between the two first guide rails (51), the top of the push frame (52) is in contact with the bottom of the first connecting plate (41), the two first guide rails (51) are wound with a second spring (53), the two ends of the second spring (53) are respectively connected to the first guide rails (51) and the push frame (52), and a U-shaped push rod (54) is connected to the middle of the front side of the push frame (52); it also includes a clamping assembly (6), the clamping assembly (6) comprises a second guide rail (61), a third spring (62) and a first wedge-shaped clamping block (63). Two second guide rails (61) are connected to the middle of the lower rear part of the table bottom plate (3). The two second guide rails (61) are symmetrically arranged. The two second guide rails (61) are slidably provided with a first wedge-shaped clamping block (63) for clamping the second connecting plate (42). The two second guide rails (61) are wound with a third spring (62). The two ends of the third spring (62) are respectively connected to the first wedge-shaped clamping block (63) and the table bottom plate (3).

2. A desk with adjustable desktop size as claimed in claim 1, characterized in that: The invention also comprises an opening assembly (7), the opening assembly (7) comprising a third guide rail (71), a fourth spring (72), a first connecting rod (73), a trapezoidal block (74) and a fifth spring (75). The third guide rails (71) are slidably provided on both left and right sides of the lower part of the pushing frame (52). The first connecting rod (73) is connected between the rear ends of the two third guide rails (71). The fourth spring (72) is wound around the two third guide rails (71). The two ends of the fourth spring (72) are respectively connected to the first connecting rod (73) and the pushing frame (52). The middle part of the rear side of the first connecting rod (73) is connected to the trapezoidal block (74) for pushing the first wedge-shaped block (63). The two first wedge-shaped blocks (63) are in contact with the trapezoidal block (74). The fifth spring (75) is connected between the trapezoidal block (74) and the table bottom plate (3).

3. A desk with adjustable desktop size as claimed in claim 2, characterized in that: The device also includes a blocking assembly (8), which includes a guide sleeve (81), a second wedge-shaped block (82), a sixth spring (83), a pull wire (84), a pull rod (85) and a connecting block (86). The upper rear portion of the table bottom plate (3) is connected to the guide sleeve (81). A second wedge-shaped block (82) for clamping the U-shaped push rod (54) is slidably provided in the guide sleeve (81). The top of the second wedge-shaped block (82) contacts the bottom of the first connecting plate (41). When the push frame (52) moves backward, it will contact the second connecting plate (41). The second wedge-shaped card blocks (82) are in contact with each other, a sixth spring (83) is connected between the bottom of the second wedge-shaped card block (82) and the bottom of the guide sleeve (81), a pull wire (84) is connected to the bottom of the second wedge-shaped card block (82), the pull wire (84) passes through the bottom of the guide sleeve (81), a pull rod (85) is slidably provided in the middle of the bottom of the push frame (52), the pull wire (84) passes through the rear of the pull rod (85), a connecting block (86) is connected to the rear side of the bottom of the table bottom plate (3), and the bottom end of the pull wire (84) is connected to the top of the connecting block (86).

4. A desk with adjustable desktop size as claimed in claim 3, characterized in that: The invention also includes a rotating assembly (9), the rotating assembly (9) including a second connecting rod (91), a second torsion spring (92) and a third connecting rod (93), the front end of the pull rod (85) is rotatably connected to the second connecting rod (91), the front end of the second connecting rod (91) is connected to the third connecting rod (93), the second torsion spring (92) is wound around the second connecting rod (91), and the two ends of the second torsion spring (92) are respectively connected to the pull rod (85) and the third connecting rod (93).

5. A desk with adjustable desktop size as claimed in claim 4, characterized in that: Two slots are formed at the lower front portion of the second connecting plate (42), and two first wedge-shaped clamping blocks (63) are respectively located in the two slots.

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