Safety lock structure of an electric pencil sharpener

Abstract

The present invention discloses a safety lock structure for an electric pencil sharpener, which includes a housing (1), an upper cover (2) and a partition board (3). The top surface of the partition board (3) is provided with a first limiting structure and a second limiting structure. The partition board (3) is provided with a nib dial block (4), a pen insertion start switch (5) and a rotary lock catch (6). The nib dial block (4) is located between the first limiting structure and the second limiting structure in the non-operating state, and a part of it is located at the top of the first through hole (3.1). The nib dial block (4) abuts against the dial of the pen insertion start switch (5) and is away from the top of the first through hole (3.1) in the operating state. This safety lock structure for the electric pencil sharpener automatically turns on and off the power switch when the upper cover is opened or closed by using a mechanical structure, has good reliability, good durability and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of stationery, and more specifically, to a safety lock structure for an electric pencil sharpener. Background Art

[0002] An electric pencil sharpener is used to cut a wooden pencil so that the pencil lead is cut into a pointed shape. At present, after the upper cover of the electric pencil sharpener is opened, the power switch is disconnected to avoid adverse consequences caused by consumers' misoperation; currently, a micro switch is generally used to achieve this, but the cost of the micro switch is relatively high, and its service life is very limited. It is prone to failure after a long time. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a safety lock structure for an electric pencil sharpener that uses a mechanical structure to automatically turn on and off the power switch when the upper cover is opened or closed, has good reliability, good durability, and low cost.

[0004] The technical solution of the present invention is to provide a safety lock structure for an electric pencil sharpener having the following structure, including a housing, an upper cover, and a partition. The upper cover is provided on the top of the housing, the partition is provided inside the housing, and a first pencil sharpener hole for inserting a pencil is provided on the partition. A second pencil sharpener hole aligned with the first pencil sharpener hole is also provided on the upper cover. It is characterized in that: a first limiting structure and a second limiting structure are provided on the top surface of the partition. A pen tip dial, a pen insertion start switch, and a rotary lock are provided on the partition. One end of the pen tip dial is rotatably connected to a connecting column on the top of the partition. The other end of the pen tip dial is located between the first limiting structure and the pen insertion start switch. The pen tip dial is located between the first limiting structure and the second limiting structure in the non-working state, and a part of it is located on the top of the first pencil sharpener hole. The pen tip dial abuts against the dial of the pen insertion start switch and is away from the top of the first pencil sharpener hole in the working state.

[0005] The first limiting structure is an arc-shaped protrusion provided at the top edge of the first pencil sharpener hole on the partition. The pen tip dial abuts against the side wall of the arc-shaped protrusion and blocks a part of the first pencil sharpener hole in the non-working state.

[0006] The second limiting structure is a rotary lock that moves up and down along the partition. A positioning rod is provided on the side wall of the rotary lock. When the upper cover is opened, the rotary lock rotates upward, and the positioning rod abuts against the pen tip dial; when the upper cover is closed, the rotary lock is compressed and rotates downward, and the positioning rod rotates by an angle and separates from the pen tip dial.

[0007] The rotary lock rotates upward and the positioning rod rotates in the direction close to the pen insertion start switch.

[0008] A spring is sleeved at the bottom of the rotary latch. The top of the spring abuts against the bottom of the rotary latch, and the bottom abuts against the bottom surface of the blind hole of the partition board. Two or more spiral strips are provided at the bottom of the rotary latch. A driving arc surface and a first positioning surface are provided at the bottom of each spiral strip. The blind hole of the partition board extends to form a first bushing. At the top of the side wall of the first bushing, notches corresponding to the spiral strips in number are provided. Each notch is provided with a ramp guiding surface and a second positioning surface. When the rotary latch descends, the driving arc surface spirally descends along the ramp guiding surface until the first positioning surface abuts against the second positioning surface. The rotary latch rises and resets under the action of the spring.

[0009] A ejector rod is provided on the inner bottom surface of the upper cover and abuts against the rotary latch when the upper cover is in the closed state.

[0010] A protective cover is further provided on the top surface of the partition board. A third pencil sharpener hole is provided on the protective cover, and the third pencil sharpener hole is aligned with the first pencil sharpener hole and the second pencil sharpener hole. A second bushing coaxial with the first bushing is provided at the bottom of the protective cover. The top of the side wall of the second bushing is provided with the same structure as the first bushing and matches with the top of the rotary latch.

[0011] After adopting the above structure, the present invention has the following advantages: A rotary latch is installed on the upper part of the pencil sharpener in this structure, and two ramp guiding surfaces are provided at each end of the rotary latch; when the upper cover of the pencil sharpener is opened, the spring inside the partition board pops up the rotary latch upward, and the rotary latch makes a rotary motion along the ramp guiding surface on its upper part. At this time, the buckling part of the rotary latch locks the nib dial block, and the pen insertion start switch is also locked. At this time, the pencil cannot be inserted into the pencil sharpener hole; when the upper cover is closed, the ejector rod inside the upper cover abuts against the rotary latch, and the rotary latch makes a rotary motion along the ramp guiding surface on its lower part. At this time, the buckling part of the rotary latch disengages from the nib dial block, and the pencil sharpener can work. This structure automatically realizes the on and off of the power switch when the upper cover is opened or closed by a mechanical structure, has good reliability, good durability, and low cost.

[0012] As an improvement, the first limiting structure is an arc-shaped protrusion provided at the top edge of the first pencil sharpener hole of the partition board. The nib dial block abuts against the side wall of the arc-shaped protrusion and blocks a part of the first pencil sharpener hole in the stop working state. The arc-shaped protrusion is integrally formed with the partition board, which is convenient for processing and has good reliability.

[0013] As an improvement, the second limiting structure is a rotary latch that moves up and down along the partition board. A positioning rod is provided on the side wall of the rotary latch. When the upper cover is opened, the rotary latch rotates and rises, and the positioning rod abuts against the nib dial block; when the upper cover is closed, the rotary latch is compressed and descends, and the positioning rod rotates by an angle and separates from the nib dial block, which can ensure the rotation angle of the positioning rod and thus realize the limit.

[0014] As an improvement, the rotary lock rotates upward and the positioning rod rotates towards the direction close to the pen insertion start switch. At this time, the buckling part of the rotary lock can resist against the pen tip dial block, locking the pen insertion start switch and preventing the pencil from being inserted into the pencil sharpener hole.

[0015] As an improvement, a spring is sleeved at the bottom of the rotary lock. The top of the spring abuts against the bottom of the rotary lock, and the bottom abuts against the bottom surface of the blind hole of the partition plate. Two or more spiral strips are provided at the bottom of the rotary lock. A driving arc surface and a first positioning surface are provided at the bottom of each spiral strip. The blind hole of the partition plate extends to form a first bushing. At the top of the side wall of the first bushing, there are notches corresponding to the spiral strips in number. Each notch is provided with a ramp guiding surface and a second positioning surface. When the rotary lock descends, the driving arc surface spirally descends along the ramp guiding surface until the first positioning surface abuts against the second positioning surface. The rotary lock rises and resets under the action of the spring. The driving structure is reliable and can make the positioning rod swing.

[0016] As an improvement, a top rod is provided on the inner bottom surface of the upper cover, which abuts against the rotary lock when the upper cover is in the closed state and is a driving switch when the upper cover is opened or closed. The structure is simple and the driving is more direct.

[0017] As an improvement, a protective cover is further provided on the top surface of the partition plate. A third pencil sharpener hole is provided on the protective cover, and the third pencil sharpener hole is aligned with the first pencil sharpener hole and the second pencil sharpener hole. A second bushing coaxial with the first bushing is provided at the bottom of the protective cover. The top of the side wall of the second bushing is provided with the same structure as the first bushing and matches with the top of the rotary lock when it rises. The second bushing of the protective cover plays a guiding role when the rotary lock rises, making the spiral rising of the rotary lock smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded schematic view of the safety lock structure of the electric pencil sharpener of the present invention.

[0019] Figure 2 It is an internal schematic view of the closed state of the safety lock structure of the electric pencil sharpener of the present invention.

[0020] Figure 3 It is an internal schematic view of the open state of the safety lock structure of the electric pencil sharpener of the present invention.

[0021] Figure 4 It is a connection schematic view of the rotary lock and the partition plate of the present invention.

[0022] Figure 5 It is an exploded schematic view of the rotary lock and the partition plate of the present invention.

[0023] Figure 6 It is a schematic view of the rotary lock of the present invention.

[0024] Figure 7 An exploded schematic view of another perspective of the safety lock structure of the electric pencil sharpener of the present invention.

[0025] As shown in the figure:

[0026] 1. Outer shell, 2. Upper cover, 2.1 Second pencil sharpener hole, 2.2 Thumb rod, 3. Partition, 3.1 First pencil sharpener hole, 3.2 Arc-shaped protrusion, 3.3 Connecting column, 3.4 First bushing, 3.5 Notch, 3.5.1 Slope guiding surface, 3.5.2 Second positioning surface, 4. Tip dial, 5. Pen insertion start switch, 6. Rotary lock, 6.1 Positioning rod, 6.2 Spiral strip, 6.2.1 Driving arc surface, 6.2.2 First positioning surface, 7. Spring, 8. Protective cover, 8.1 Third pencil sharpener hole, 8.2 Second bushing. Specific implementation mode

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] As Figures 1-3 shown, the safety lock structure of the electric pencil sharpener of the present invention includes an outer shell 1, an upper cover 2 and a partition 3. The upper cover 2 is arranged on the top of the outer shell 1, the partition 3 is arranged inside the outer shell 1, and a first pencil sharpener hole 3.1 for inserting a pen is arranged on the partition 3, and a second pencil sharpener hole 2.1 aligned with the first pencil sharpener hole 3.1 is also arranged on the upper cover 2.

[0029] The top surface of the partition 3 is provided with a first limiting structure and a second limiting structure. A tip dial 4, a pen insertion start switch 5 and a rotary lock 6 are arranged on the partition 3. One end of the tip dial 4 is rotatably connected to the connecting column 3.3 on the top of the partition 3, and the other end of the tip dial 4 is located between the arc-shaped protrusion 3.2 of the first limiting structure and the pen insertion start switch 5. The tip dial 4 is located between the first limiting structure and the second limiting structure in the non-working state, and a part of it is located at the top of the first pencil sharpener hole 3.1. The tip dial 4 abuts against the dial of the pen insertion start switch 5 and is away from the top of the first pencil sharpener hole 3.1 in the working state.

[0030] The first limiting structure is an arc-shaped protrusion 3.2 arranged at the top edge of the first pencil sharpener hole 3.1 of the partition 3. The arc-shaped protrusion 3.2 in this embodiment is semicircular, and the inner wall of the arc-shaped protrusion 3.2 is aligned with the inner wall of the first pencil sharpener hole 3.1. The tip dial 4 abuts against the side wall of the arc-shaped protrusion 3.2 and blocks a part of the first pencil sharpener hole 3.1 in the non-working state. When they abut against each other, both sides of the arc-shaped protrusion 3.2 abut against the side surface of the tip dial 4. At this time, the tip dial 4 blocks a part of the first pencil sharpener hole 3.1, reducing the cross-sectional area of the first pencil sharpener hole 3.1, so that the pencil cannot be inserted into the pencil sharpener hole.

[0031] As shown Figures 4-6 in the figure, the second limiting structure is a rotary lock 6 that moves up and down along the partition 3. A positioning rod 6.1 is provided on the side wall of the rotary lock 6. When the upper cover 2 is in the open state, the rotary lock 6 rotates and rises, and the positioning rod 6.1 abuts against the pen tip dial 4;

[0032] When the upper cover 2 covers the state, the compressed rotary lock 6 descends, and the positioning rod 6.1 rotates by an angle and separates from the pen tip dial 4.

[0033] The rotary lock 6 rotates and rises, and the positioning rod 6.1 rotates towards the direction close to the pen insertion start switch 5.

[0034] A spring 7 is sleeved at the bottom of the rotary lock 6. The top of the spring 7 abuts against the bottom of the rotary lock 6, and the bottom abuts against the bottom surface of the blind hole of the partition 3; when the rotary lock 6 is compressed and rotates downward in a spiral manner, the spring 7 is compressed; when the upper cover is opened, the rotary lock 6 rotates upward in a spiral manner under the action of the spring 7.

[0035] Two or more spiral strips 6.2 are provided at the bottom of the rotary lock 6 to achieve symmetry and make the driving force uniform. In this embodiment, there are three spiral strips. A driving arc surface 6.2.1 and a first positioning surface 6.2.2 are provided at the bottom of each spiral strip 6.2.

[0036] The blind hole of the partition 3 extends to form a first bushing 3.4. A notch 3.5 corresponding to the spiral strip 6.2 in number is provided at the top of the side wall of the first bushing 3.4. Each notch 3.5 is provided with a ramp guiding surface 3.5.1 and a second positioning surface 3.5.2.

[0037] When the rotary lock 6 descends, the driving arc surface 6.2.1 spirally descends along the ramp guiding surface 3.5.1 until the first positioning surface 6.2.2 abuts against the second positioning surface 3.5.2, and the rotary lock 6 rises and resets under the action of the spring 7.

[0038] A top rod 2.2 is provided on the inner bottom surface of the upper cover 2 and abuts against the rotary lock 6 when the upper cover 2 is in the covered state.

[0039] As shown Figure 7 in the figure, a protective cover 8 is further provided on the top surface of the partition 3. The protective cover 8 encloses the pen tip dial 4, the pen insertion start switch 5 and the rotary lock 6 on the partition 3, and the top rod 2.2 passes through the through hole on the protective cover 8 and abuts against the rotary lock 6.

[0040] A third pencil sharpener hole 8.1 is provided on the protective cover 8, and the third pencil sharpener hole 8.1 is aligned with the first pencil sharpener hole 3.1 and the second pencil sharpener hole 2.1.

[0041] The bottom of the protective cover 8 is provided with a second bushing 8.2 coaxial with the first bushing 3.4. The top of the side wall of the second bushing 8.2 is provided with the same structure as the first bushing 3.4 and is matched with the top of the rotary latch 6 when it rises. That is, the top and bottom surfaces of the spiral bar 6.2 of the rotary latch 6 are both provided with a driving arc surface and a first positioning surface, and the bottom surface of the second bushing 8.2 is also provided with a ramp guiding surface and a second positioning surface, so as to play a guiding role when the rotary latch 6 spirally rises.

[0042] When the upper cover 2 of the pencil sharpener is opened, the internal spring 7 of the partition 3 bounces the rotary latch 6 upward, and the rotary latch 6 makes a rotary motion along the ramp guiding surface on its upper part. At this time, the buckling part of the rotary latch 6 locks the nib dial 4, and the pen insertion start switch is also locked, so that the pencil cannot be inserted into the pencil sharpener hole; when the upper cover 2 is closed, the ejector rod 2.2 inside the upper cover 2 abuts against the rotary latch 6, and the rotary latch 6 makes a rotary motion along the ramp guiding surface on its lower part. At this time, the buckling part of the rotary latch 6 disengages from the nib dial 4, and the pencil sharpener can work.

Claims

1. An electric pencil sharpener safety lock structure, comprising a housing (1), an upper cover (2) and a partition (3). The upper cover (2) is arranged on the top of the housing (1), and the partition (3) is arranged inside the housing (1). A first pencil sharpening hole (3.1) for a pencil to be inserted is provided on the partition (3), and a second pencil sharpening hole (2.1) aligned with the first pencil sharpening hole (3.1) is also provided on the upper cover (2). Characterized in that: A first limiting structure and a second limiting structure are provided on the top surface of the partition (3). The first limiting structure is an arc-shaped protrusion (3.2) provided at the top edge of the first pencil sharpening hole (3.1) of the partition (3), and the second limiting structure is a rotary lock (6) that moves up and down along the partition (3). A nib dial (4), a pen insertion start switch (5) and a rotary lock (6) are provided on the partition (3). One end of the nib dial (4) is rotatably connected to a connecting column (3.3) on the top of the partition (3), and the other end of the nib dial (4) is located between the first limiting structure and the pen insertion start switch (5). The nib dial (4) is located between the first limiting structure and the second limiting structure in the non-working state, and a part of it is located at the top of the first pencil sharpening hole (3.1). The nib dial (4) abuts against the dial of the pen insertion start switch (5) and is away from the top of the first pencil sharpening hole (3.1) in the working state.

2. The electric pencil sharpener safety lock structure according to claim 1, Characterized in that: The nib dial (4) abuts against the side wall of the arc-shaped protrusion (3.2) and blocks a part of the first pencil sharpening hole (3.1) in the non-working state.

3. The electric pencil sharpener safety lock structure according to claim 1, Characterized in that: A positioning rod (6.1) is provided on the side wall of the rotary lock (6). When the upper cover (2) is in the open state, the rotary lock (6) rotates upward, and the positioning rod (6.1) abuts against the nib dial (4). When the upper cover (2) is in the covered state, the rotary lock (6) is compressed and rotates downward, and the positioning rod (6.1) rotates by an angle and separates from the nib dial (4).

4. The electric pencil sharpener safety lock structure according to claim 3, Characterized in that: The rotary lock (6) rotates upward and the positioning rod (6.1) rotates towards the pen insertion start switch (5).

5. The electric pencil sharpener safety lock structure according to claim 1, Characterized in that: A spring (7) is sleeved at the bottom of the rotary lock (6). The top of the spring (7) abuts against the bottom of the rotary lock (6), and the bottom abuts against the bottom surface of the blind hole of the partition plate (3); two or more spiral strips (6.2) are provided at the bottom of the rotary lock (6). A driving arc surface (6.2.1) and a first positioning surface (6.2.2) are provided at the bottom of each spiral strip (6.2). A first bushing (3.4) is formed by the protrusion of the blind hole of the partition plate (3). At the top of the side wall of the first bushing (3.4), notches (3.5) corresponding to the spiral strips (6.2) in number are provided. Each notch (3.5) is provided with a ramp guiding surface (3.5.1) and a second positioning surface (3.5.2). When the rotary lock (6) descends, the driving arc surface (6.2.1) spirally descends along the ramp guiding surface (3.5.1) until the first positioning surface (6.2.2) abuts against the second positioning surface (3.5.2). The rotary lock (6) rises and resets under the action of the spring (7).

6. The safety lock structure of the electric pencil sharpener according to claim 1, characterized in that: A push rod (2.2) is provided on the inner bottom surface of the upper cover (2) and abuts against the rotary lock (6) when the upper cover (2) is in the closed state.

7. The safety lock structure of the electric pencil sharpener according to claim 5, characterized in that: A protective cover (8) is further provided on the top surface of the partition plate (3). A third pencil sharpening hole (8.1) is provided on the protective cover (8), and the third pencil sharpening hole (8.1) is aligned with the first pencil sharpening hole (3.1) and the second pencil sharpening hole (2.1); A second bushing (8.2) coaxial with the first bushing (3.4) is provided at the bottom of the protective cover (8). The top of the side wall of the second bushing (8.2) is provided with the same structure as the first bushing (3.4) and matches the top of the rotary lock (6) when it rises.

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