sandpaper holder
By incorporating a cam and elastic arm into the base of the sander, the problem of existing sanders requiring pressing to keep the clamp open is solved. This enables two-handed operation without pressing and enhances clamping force, ensuring that the sandpaper or abrasive cloth is correctly positioned and taut.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SAAME TOOLS SHANGHAI IMPORT & EXPORT CO LTD
- Filing Date
- 2025-11-26
- Publication Date
- 2026-06-12
Smart Images
Figure CN122185064A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hand tools, and more particularly to sanders. Background Technology
[0002] A sander is a handheld tool used to hold sandpaper or abrasive cloth for sanding, polishing, and other operations. It is widely used in woodworking, wall treatment, metal processing, and other fields.
[0003] Existing sanders require continuous pressing to keep the clamp open when installing or removing sandpaper or abrasive cloth. This design forces users to use one hand to press the clamp and the other to operate the sandpaper or abrasive cloth, which is inconvenient and can easily lead to inaccurate installation or failure to taut the sandpaper or abrasive cloth. Summary of the Invention
[0004] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a sander that can keep the clamp in an open state without pressing.
[0005] One of the objectives of this invention is achieved through the following technical solution: A sander includes a base and a clamping plate rotatably mounted on the base. The base includes a plate body and a cam extending from the plate body. The cam has a retaining surface. The clamping plate includes a body and an elastic arm extending from the body. When the clamping plate rotates relative to the base until the elastic arm abuts against the retaining surface, the elastic force of the elastic arm keeps the body and the base in an open state.
[0006] Furthermore, the plate body is provided with a clamping part, which is located at the end of the plate body. The clamping part is provided with a contact surface, the object being clamped is located on the contact surface, and the holding surface is located on the side of the cam away from the contact surface.
[0007] Furthermore, the cam is also provided with a clamping surface, which is located on the side of the cam close to the contact surface. When the clamping plate rotates relative to the base until the elastic arm abuts against the clamping surface, the elastic force of the elastic arm causes the body to press against the clamped object on the base.
[0008] Furthermore, the retaining surface forms an angle with the clamping surface.
[0009] Furthermore, the retaining surface is a plane, the clamping surface is a plane, and an obtuse angle is formed between the retaining surface and the clamping surface.
[0010] Furthermore, a protrusion is formed between the retaining surface and the clamping surface, and when the body presses against the clamped object on the base, the elastic arm abuts against the protrusion.
[0011] Furthermore, the shape of the body facing the bonding surface is the same as the shape of the bonding surface.
[0012] Furthermore, the bonding surface is a curved surface.
[0013] Furthermore, there are two clamping parts, which are located at opposite ends of the plate body, and there are two clamping plates, which are rotatably mounted on the two clamping parts.
[0014] Furthermore, the clamp also includes a pressing part that extends from the body. The pressing part includes a pressing plate and an elastic arm that extends from the pressing plate. Grooves are formed between the two sides of the elastic arm and the pressing plate.
[0015] Furthermore, the elastic arm is provided with an abutting surface, and when the body and the base are kept in an open state, the abutting surface is in contact with the holding surface.
[0016] Furthermore, the pressing piece forms an angle with the body.
[0017] Furthermore, the number of the two bodies is two, and the two bodies are arranged along the width direction of the plate, with the pressing part located between the two bodies.
[0018] Furthermore, an opening is formed between the two bodies.
[0019] Furthermore, the clamping plate also includes a rotating part that extends from the body and has a second pivot hole. The base also includes a mounting part that has a first pivot hole. The sander also includes a rotating shaft that is mounted in the first pivot hole and the second pivot hole to rotatably connect the rotating part and the mounting part.
[0020] Furthermore, there are multiple mounting parts, which are arranged along the width direction of the plate body, with a gap formed between adjacent mounting parts, and the rotating part is located in the gap.
[0021] Furthermore, the upper surface of the plate is provided with scale markings, which are arranged along the length of the plate.
[0022] Furthermore, the sander also includes a soft pad, which is fixed to the side of the plate away from the clamping plate.
[0023] Furthermore, the clamp is made of plastic.
[0024] Compared with the prior art, the sander of the present invention has the following advantages: (1) By setting a cam and setting a retaining surface on the cam, when the clamp plate rotates relative to the base until the elastic arm abuts against the retaining surface, the elastic force of the elastic arm keeps the body and the base in an open state without pressing; the user can operate sandpaper or sanding cloth with both hands, which is convenient to use. (2) The cam is also provided with a clamping surface. The clamping surface is located on the side of the cam close to the contact surface. When the clamping plate rotates relative to the base until the elastic arm contacts the clamping surface, the elastic force of the elastic arm causes the body to press against the clamped object on the base, increasing the clamping force of the clamping plate and preventing the sandpaper or sanding cloth from falling off the sander. (3) An opening is formed between the two bodies of the clamp, and the size of the opening is large enough to accommodate a thumb. When clamping, the thumb can be used to press down on the sandpaper or abrasive cloth to ensure that the sandpaper or abrasive cloth is in the correct position and in a taut state after clamping. Attached Figure Description
[0025] Figure 1 This is a perspective view of the sander of the present invention; Figure 2 for Figure 1 Exploded view of a sander; Figure 3 for Figure 2 A three-dimensional view of the base of the sander; Figure 4 for Figure 3 A partial structural diagram of the base; Figure 5 for Figure 2 A three-dimensional view of the clamping plate of a sander; Figure 6 for Figure 5 A three-dimensional view of the clamp from another perspective; Figure 7 for Figure 1 A three-dimensional sectional view of a sander; Figure 8 for Figure 7 Enlarged view of point A on the sander; Figure 9 for Figure 7 Enlarged view of point B on the sander; Figure 10 for Figure 1 A 3D diagram showing the usage status of a sander.
[0026] In the diagram: 10. Base; 11. Plate; 110. Scale markings; 12. Connecting part; 120. Fixing hole; 13. Clamping part; 131. Contact surface; 14. Mounting part; 140. First pivot hole; 15. Cam; 151. Holding surface; 152. Clamping surface; 153. Protrusion; 154. Alternating hole; 20. Handle; 30. Fastener; 40. Clamping plate; 41. Body; 410. First anti-slip texture; 42. Rotating part; 420. Second pivot hole; 43. Pressing part; 430. Pressing piece; 4301. Second anti-slip texture; 431. Elastic arm; 4310. Contact surface; 432. Slot; 44. Opening; 50. Rotating shaft; 60. Soft pad; 100. Clamped object. Detailed Implementation
[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0028] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0030] This application discloses a sander, a handheld tool used to hold sandpaper or abrasive cloth for grinding, polishing, and other operations. In this embodiment, the sandpaper or abrasive cloth is defined as the object being held 100.
[0031] Please see Figure 1 as well as Figure 2The sander includes a base 10, a handle 20, a fastener 30, a clamping plate 40, a rotating shaft 50, and a soft pad 60. The handle 20 is fixed to the upper surface of the base 10 by the fastener 30. The handle 20 is used by the user to grip the sander for grinding, polishing, and other operations. The clamping plate 40 is rotatably mounted to the base 10 via the rotating shaft 50. The clamping plate 40 is used to clamp or release the clamped object 100 for easy installation and replacement. The soft pad 60 is fixed to the side of the base 10 away from the handle 20 to absorb vibration energy during sanding, reducing vibration and improving working comfort.
[0032] Please continue reading. Figure 2 as well as Figure 3 The base 10 includes a plate 11, a connecting part 12, a clamping part 13, a mounting part 14, and a cam 15.
[0033] The plate body 11 has a rectangular plate structure. Scale markings 110 are provided on both sides of the upper surface of the plate body 11 to indicate the working distance of the sander. A connecting part 12 extends from the upper surface of the plate body 11 and is used to fix the handle 20. The connecting part 12 has fixing holes 120, through which fasteners 30 pass to engage with the handle 20, thus fixing the handle 20 to the upper surface of the base 10. Two clamping parts 13 are used to clamp the object 100. These two clamping parts 13 are located at opposite ends of the plate body 11 along its length. The cross-section of each clamping part 13 is approximately triangular, and the upper surface of the clamping part 13 is inclined to form a contact surface 131. The end of the object 100 is folded upwards and pressed against the contact surface 131. Specifically, the bonding surface 131 is curved to increase the friction after the clamped object 100 is clamped, and to prevent the clamped object 100 from detaching from the bonding surface 131.
[0034] Mounting portion 14 extends from plate 11 and has a first pivot hole 140 for mounting pivot shaft 50 to rotatably connect base 10 and clamping plate 40. Specifically, mounting portion 14 is located on the upper surface of plate 11 and at the end of mating surface 131. In other embodiments, mounting portion 14 is located on the side of plate 11. Multiple mounting portions 14 are provided, with gaps between them for mounting rotating portion 42.
[0035] A cam 15 extends from the plate 11 and abuts against the elastic arm 431 to keep the clamping plate 40 open or closed. The cam 15 is located on the upper surface of the plate 11 and between a plurality of mounting portions 14. In this embodiment, there are two cams 15, which are spaced apart, and the plurality of mounting portions 14 are symmetrically arranged about the centerline between the two cams 15. The cam 15 has a holding surface 151, a clamping surface 152, and a clearance hole 154. The holding surface 151 is located on the side of the cam 15 away from the contact surface 131, and the clamping surface 152 is located on the side of the cam 15 closer to the contact surface 131. Both the holding surface 151 and the clamping surface 152 are planar and inclined, forming an angle between them. In this embodiment, a protrusion 153 is formed between the holding surface 151 and the clamping surface 152. The retaining surface 151 abuts against the elastic arm 431, keeping the clamping plate 40 in an open state. The clamping surface 152 abuts against the elastic arm 431, keeping the clamping plate 40 in a closed state and clamping the object 100. The clearance hole 154 and the first pivot hole 140 are on the same straight line, and the pivot 50 is installed through the clearance hole 154.
[0036] The handle 20 is oval-shaped, similar to a bar of soap, making it easy for users to grip. The upper surface of the handle 20 has anti-slip texture to prevent slipping.
[0037] Fastener 30 is a screw or pin.
[0038] Please continue reading. Figure 5 as well as Figure 6 The clamping plate 40 is made of plastic. The clamping plate 40 is rotatably mounted on the base 10, and its rotation relative to the base 10 switches between an open state and a clamped state. Specifically, the clamping plate 40 includes a body 41, a rotating part 42, and a pressing part 43. Both the rotating part 42 and the pressing part 43 extend from the body 41, and the body 41, rotating part 42, and pressing part 43 are integrally formed. The body 41 is used to clamp the object 100, the rotating part 42 is used for rotatable connection with the base 10, and the pressing part 43 is used by the operator to press and apply elastic force to the body 41, keeping the body 41 open or clamped.
[0039] Specifically, there are two bodies 41, spaced apart and arranged along the width direction of the plate 11. A pressing part 43 is located between the two bodies 41 and extends from them. An opening 44 is formed between the two bodies 41, the width of which is greater than the width of a thumb, allowing the thumb to press down on sandpaper or abrasive cloth when the object 100 is clamped, ensuring the sandpaper or abrasive cloth is correctly positioned and taut after clamping. The body 41 has a first anti-slip texture 410, which allows each body 41 to be pressed individually, facilitating adjustment of one side of the end of the object 100. A rotating part 42 extends from the bottom of the body 41 and has a second pivot hole 420. When the rotating part 42 is installed in the gap between two adjacent mounting parts 14, the second pivot hole 420 and the first pivot hole 140 are on the same straight line. The rotating shaft 50 is installed in both the second pivot hole 420 and the first pivot hole 140. The pressing part 43 forms an angle with the body 41. The pressing part 43 includes a pressing plate 430 and an elastic arm 431. The elastic arm 431 extends from the pressing plate 430, and slots 432 are formed between the two sides of the elastic arm 431 and the pressing plate 430. The slots 432 allow the elastic arm 431 to deform, thereby generating an elastic force that acts on the body 41. The side of the elastic arm 431 near the rotating part 42 has a contact surface 4310. When the contact surface 4310 contacts the holding surface 151, the elastic arm 431 deforms relative to the pressing plate 430, and the elastic force of the elastic arm 431 keeps the body 41 open relative to the contact surface 131. When the clamping plate 40 rotates until the contact surface 4310 contacts the clamping surface 152, the elastic arm 431 deforms relative to the pressing plate 430, and the elastic force of the elastic arm 431 clamps the object 100 on the contact surface 131.
[0040] The soft pad 60 is fixed to the side of the base 10 away from the handle 20 to absorb the vibration energy during sanding, reduce the shaking during operation, and improve working comfort.
[0041] Please continue reading. Figures 7 to 10When it is necessary to clamp the object 100, press the pressing piece 430 of the clamping plate 40 to make the clamping plate 40 rotate relative to the base 10. When the clamping plate 40 rotates to the point where the contact surface 4310 of the elastic arm 431 contacts the holding surface 151, the elastic arm 431 deforms. The elastic force of the elastic arm 431 keeps the body 41 of the clamping plate 40 open with the contact surface 131, so that the end of the object 100 is placed on the contact surface 131. At this time, the user does not need to continue pressing and can operate with both hands or one hand. When the object 100 is placed, press the pressing plate 430 of the clamping plate 40 to reverse the clamping plate 40 relative to the base 10 until the elastic arm 431 contacts the clamping surface 152. At this time, the elastic arm 431 deforms, and the elastic force of the elastic arm 431 causes the body 41 of the clamping plate 40 to press against the object 100 on the contact surface 131, and the object 100 is in a clamped state. Press the object 100 with your thumb through the opening 44 to ensure that the object 100 is in the correct position and taut after clamping.
[0042] The sander of the present invention features a cam 15 with a retaining surface 151. When the clamping plate 40 rotates relative to the base 10 until the elastic arm 431 contacts the retaining surface 151, the elastic force of the elastic arm 431 keeps the body 41 open from the base 10, eliminating the need for pressing. This allows the user to operate the sandpaper or abrasive cloth with both hands, making it convenient to use. The cam 15 also has a clamping surface 152 located on the side of the cam 15 closest to the contact surface 131. When the clamping plate 40 rotates relative to the base 10 until the elastic arm 431 contacts the clamping surface 152, the elastic force of the elastic arm 431 causes the body 41 to press against the clamped object 100 on the base 10, increasing the clamping force of the clamping plate 40 and preventing the sandpaper or abrasive cloth from detaching from the sander. An opening 44 is formed between the two bodies 41 of the clamping plate 40, large enough to accommodate a thumb. When clamping, the thumb can be used to press down on the sandpaper or abrasive cloth, ensuring that the sandpaper or abrasive cloth is correctly positioned and taut after clamping.
[0043] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.
Claims
1. A sander, comprising a base and a clamping plate rotatably mounted on the base, characterized in that: The base includes a plate and a cam extending from the plate. The cam has a retaining surface. The clamping plate includes a body and an elastic arm extending from the body. When the clamping plate rotates relative to the base until the elastic arm abuts against the retaining surface, the elastic force of the elastic arm keeps the body and the base in an open state.
2. The sander according to claim 1, characterized in that: The plate body is provided with a clamping part, which is located at the end of the plate body. The clamping part is provided with a contact surface, the object being clamped is located on the contact surface, and the holding surface is located on the side of the cam away from the contact surface.
3. The sander according to claim 2, characterized in that: The cam is also provided with a clamping surface, which is located on the side of the cam close to the contact surface. When the clamping plate rotates relative to the base until the elastic arm abuts against the clamping surface, the elastic force of the elastic arm causes the body to press against the clamped object on the base.
4. The sander according to claim 4, characterized in that: The retaining surface forms an angle with the clamping surface.
5. The sander according to claim 2, characterized in that: The retaining surface is a plane, the clamping surface is a plane, and the retaining surface and the clamping surface form an obtuse angle.
6. The sander according to claim 3, characterized in that: A protrusion is formed between the retaining surface and the clamping surface. When the body presses against the clamped object on the base, the elastic arm abuts against the protrusion.
7. The sander according to claim 2, characterized in that: The shape of the body facing the bonding surface is the same as the shape of the bonding surface.
8. The sander according to claim 7, characterized in that: The bonding surface is curved.
9. The sander according to claim 2, characterized in that: The number of clamping parts is two, and the two clamping parts are located at opposite ends of the plate. The number of clamping plates is two, and the two clamping plates are rotatably mounted on the two clamping parts.
10. The sander according to claim 1, characterized in that: The clamp also includes a pressing part that extends from the body. The pressing part includes a pressing plate and an elastic arm that extends from the pressing plate. Grooves are formed between the two sides of the elastic arm and the pressing plate.
11. The sander according to claim 10, characterized in that: The elastic arm has an abutting surface, and when the body and the base are kept in an open state, the abutting surface is in contact with the holding surface.
12. The sander according to claim 10, characterized in that: The pressing piece forms an angle with the body.
13. The sander according to claim 10, characterized in that: The number of the two bodies is two, and the two bodies are arranged along the width direction of the plate, with the pressing part located between the two bodies.
14. The sander according to claim 13, characterized in that: An opening is formed between the two bodies.
15. The sander according to claim 1, characterized in that: The clamp also includes a rotating part that extends from the body and has a second pivot hole. The base also includes a mounting part that has a first pivot hole. The sander also includes a rotating shaft that is mounted in the first pivot hole and the second pivot hole to rotatably connect the rotating part and the mounting part.
16. The sander according to claim 15, characterized in that: The number of mounting parts is multiple, and the multiple mounting parts are arranged along the width direction of the plate body, with a gap formed between two adjacent mounting parts, and the rotating part is located in the gap.
17. The sander according to claim 1, characterized in that: The upper surface of the plate is provided with scale markings, which are arranged along the length of the plate.
18. The sander according to claim 1, characterized in that: The sander also includes a soft pad, which is fixed to the side of the plate away from the clamping plate.