A saw blade locking device

Abstract

The utility model provides a saw blade locking device, include: output shaft and locking block, the output shaft upper end is provided with the cushion block, the cushion block is provided with the reverse tooth thread hole, the reverse tooth thread hole spiral line rotation direction is opposite with output shaft rotation direction, the locking block is provided with the reverse tooth screw post in vertical direction, the reverse tooth screw post cooperates with the reverse tooth thread hole, the locking block is provided with the pin, when the reverse tooth screw post is spun into the reverse tooth thread hole, the locking block cooperates with the cushion block on the output shaft upper end to lock the saw blade and the pin is clamped into the positioning hole of saw blade, when the machine is in the use process and the saw blade meets the resistance, the saw blade passes through the pin and gives the locking block power, thereby makes the output shaft relatively locking block produces the rotation of the tightening direction, the locking block drives the reverse tooth screw post to spin into the reverse tooth thread hole, makes the locking block and the cushion block lock the saw blade, forms the self locking effect.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a saw blade locking device. Background Technology

[0002] A cold saw is a power tool that, during the metal sawing process, transfers the heat generated by the saw blade teeth as they cut the workpiece to the sawdust through the saw teeth, keeping both the workpiece and the saw blade cool, hence the name cold sawing.

[0003] The existing cold-cutting saw blade has two positioning holes, two positioning pins on the output shaft disc, and a pressure plate for clamping the saw blade. This torque transmission method relies mainly on the pins to transmit torque. The pins are prone to breakage and failure when encountering a large load, which causes the connection between the saw blade and the output shaft to fail, making continuous cutting impossible. Utility Model Content

[0004] The purpose of this invention is to provide a saw blade locking device. A pin is inserted into the positioning hole of the saw blade, and a reverse-threaded stud engages with a reverse-threaded hole. When the saw blade encounters resistance during machine operation, the saw blade transmits power to the locking block through the pin, causing the output shaft to rotate relative to the locking block in a tightening direction. The locking block drives the reverse-threaded stud to screw into the reverse-threaded hole, locking the saw blade between the locking block and the pad, creating a self-locking effect—that is, the saw blade tightens as it rotates. This firmly locks the saw blade, utilizing the enormous pressure and friction generated between the pad and the locking block to drive the saw blade to rotate. The pin only plays an auxiliary role and no longer bears the main torque. This solves the problem that the pin is prone to breakage and failure under large loads, leading to the failure of the connection between the saw blade and the output shaft and the inability to perform continuous cutting. This further improves the performance of the machine.

[0005] This application provides a saw blade locking device, including: an output shaft and a locking block; a pad is provided at the upper end of the output shaft; a reverse threaded hole is provided in the pad, the spiral direction of the reverse threaded hole is opposite to the rotation direction of the output shaft; a reverse threaded stud is vertically provided on the locking block; the reverse threaded stud cooperates with the reverse threaded hole; a pin is provided on the locking block; when the reverse threaded stud is screwed into the reverse threaded hole, the locking block cooperates with the pad at the upper end of the output shaft to lock the saw blade, and at the same time the pin is engaged in the positioning hole of the saw blade.

[0006] Preferably, the upper end face of the pad has a first plane; the lower end face of the locking block has a second plane; when the reverse thread stud is screwed into the reverse thread hole, the first plane and the second plane clamp the saw blade.

[0007] Preferably, the reverse-threaded stud has an internal hexagonal hole in the middle.

[0008] Preferably, there are two pins, which are symmetrically arranged on the lower end face of the locking block.

[0009] Because this utility model adopts the above-described technical solution, it has the following advantages:

[0010] 1. This utility model features a reverse-threaded hole within the pad block; a reverse-threaded stud and a pin are vertically mounted on the locking block; the pin is inserted into the positioning hole of the saw blade, and the reverse-threaded stud engages with the reverse-threaded hole. When the saw blade encounters resistance during machine operation, the saw blade transmits power to the locking block through the pin, causing the output shaft to rotate relative to the locking block in a tightening direction; the locking block drives the reverse-threaded stud to screw into the reverse-threaded hole, locking the saw blade between the locking block and the pad block, creating a self-locking effect—that is, the saw blade tightens as it rotates. This securely locks the saw blade, utilizing the immense pressure and friction generated between the pad block and the locking block to drive the saw blade's rotation. The pin only plays an auxiliary role and no longer bears the main torque. This solves the problem that pins are prone to breakage and failure under large loads, leading to connection failure between the saw blade and the output shaft, preventing continuous cutting. This further improves the machine's performance.

[0011] 2. By setting the first plane and the second plane to clamp the saw blade, this utility model can increase the pressure surface on both sides of the saw blade; thus, the pad block and the locking block can clamp the saw blade more firmly.

[0012] 3. This utility model features a reverse-threaded stud with an internal hexagonal hole in the middle. When the saw blade needs to be replaced, a hexagonal wrench is inserted into the internal hexagonal hole, and the locking block is turned clockwise to disengage the locking block from the pad, thus making it easier to replace the saw blade. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a saw blade locking device according to the present invention.

[0014] Figure 2 This is an exploded structural diagram of a saw blade locking device according to the present invention.

[0015] Figure 3 This is a schematic diagram of the locking block structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the output shaft structure of this utility model.

[0017] Figure 5 This is a schematic diagram of the saw blade locking device of this utility model.

[0018] Icon labels:

[0019] 1-Output shaft; 2-Locking block; 3-Saw blade; 11-Padded block; 12-Reverse threaded hole; 13-First plane; 21-Reverse threaded stud; 22-Pin; 23-Second plane; 211-Internal hexagonal hole. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or it can be an element placed in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] 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 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.

[0023] See Figure 1-5 To address the issue that existing cold-cutting saw blades have two positioning holes, two positioning pins on the output shaft disc, and a pressure plate for clamping the saw blade, the torque transmission relies primarily on the pins. These pins are prone to breakage under heavy loads, leading to a disconnect between the saw blade and the output shaft. This invention provides a saw blade locking device, comprising: an output shaft 1 and a locking block 2; a pad 11 is provided at the upper end of the output shaft 1; a reverse-threaded hole 12 is provided within the pad 11, the spiral direction of the reverse-threaded hole 12 being opposite to the rotation direction of the output shaft 1; a reverse-threaded stud 21 is vertically provided on the locking block 2; the reverse-threaded stud 21 engages with the reverse-threaded hole 12; a pin 22 is provided on the locking block 2; when the reverse-threaded stud 21 is screwed into the reverse-threaded hole 12, the locking block 2 engages with the pad 11 at the upper end of the output shaft 1 to lock the saw blade 3, while the pin 22 engages with the positioning hole of the saw blade 3. For example, the output shaft 1 rotates clockwise; the spiral of the reverse threaded hole 12 rotates counterclockwise; and the spiral of the reverse threaded stud 21 also rotates counterclockwise.

[0024] The machine employs a design where a reverse-threaded hole 12 is provided within the pad 11; a reverse-threaded stud 21 and a pin 22 are vertically mounted on the locking block 2; the pin 22 is inserted into the positioning hole of the saw blade 3, and the reverse-threaded stud 21 engages with the reverse-threaded hole 12. When the saw blade 3 encounters resistance during machine operation, the saw blade 3 transmits power to the locking block 2 via the pin 22, causing the output shaft 1 to rotate relative to the locking block 2 in a tightening direction. The locking block 2 then drives the reverse-threaded stud 21 to screw into the reverse-threaded hole 12, locking the saw blade between the locking block 2 and the pad 11, creating a self-locking effect—that is, the saw blade 3 becomes tighter as it rotates. This ensures a firm lock on the saw blade 3. The immense pressure and friction generated between the pad 11 and the locking block 2 drive the saw blade 3 to rotate, with the pin 22 playing only an auxiliary role and no longer bearing the main torque. This solves the problem of the pin easily breaking under heavy loads, leading to a failure in the connection between the saw blade and the output shaft, preventing continuous cutting. This further enhances the machine's performance.

[0025] In another embodiment of this application, the upper end face of the pad block 11 has a first plane 13; the lower end face of the locking block 2 has a second plane 23; when the reverse thread stud 21 is screwed into the reverse thread hole 12, the first plane 13 and the second plane 23 clamp the saw blade 3. By setting the first plane 13 and the second plane 23 to clamp the saw blade 3, the pressure surface on both sides of the saw blade 3 can be increased; thereby enabling the pad block 11 and the locking block 2 to clamp the saw blade 3 more firmly.

[0026] In another embodiment of this application, the reverse-threaded stud 21 is provided with an internal hexagonal hole 211 in the middle. By providing an internal hexagonal hole 211 in the middle of the reverse-threaded stud 21, when it is necessary to replace the saw blade 3, the locking block 2 is disengaged from the pad block 11 by inserting a hexagonal wrench into the internal hexagonal hole 211 and turning it clockwise, thereby making it easier to replace the saw blade 3.

[0027] In another embodiment of this application, there are two pins 22, which are symmetrically arranged on the lower end face of the locking block 2. The number of pins 22 can be two, three, etc.; the number of pins 22 corresponds to the number of positioning holes on the saw blade 3; by setting there to two pins 22, the pins 22 can be engaged in the positioning holes of the saw blade 3, thus positioning the saw blade 3.

[0028] This utility model also includes at least the following advantages:

[0029] This invention features a pad 11 with a reverse-threaded hole 12; a locking block 2 with a reverse-threaded stud 21 and a pin 22 vertically arranged on it; the pin 22 is inserted into the positioning hole of the saw blade 3, and the reverse-threaded stud 21 engages with the reverse-threaded hole 12. When the saw blade 3 encounters resistance during machine operation, the saw blade 3 provides power to the locking block 2 through the pin 22, causing the output shaft 1 to rotate relative to the locking block 2 in a tightening direction. The locking block 2 drives the reverse-threaded stud 21 to screw into the reverse-threaded hole 12, locking the saw blade between the locking block 2 and the pad 11, forming a self-locking effect, i.e., the saw blade 3 becomes tighter as it rotates. This firmly locks the saw blade 3, and the huge pressure and friction generated between the pad 11 and the locking block 2 drive the saw blade 3 to rotate. The pin 22 only plays an auxiliary role and no longer bears the main torque. This solves the problem that the pin is prone to breakage and failure under large loads, which would cause the connection between the saw blade and the output shaft to fail, preventing continuous cutting. This allows for further improvement in machine performance. When the saw blade 3 needs to be replaced, the locking block 2 is disengaged from the pad block 11 by inserting a hex wrench into the internal hexagonal hole 211 and turning it clockwise, making it easier to replace the saw blade 3.

[0030] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0031] The above description is merely an embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A saw blade locking device, characterized in that, include: Output shaft (1) and locking block (2); a pad (11) is provided at the upper end of the output shaft (1); a reverse thread hole (12) is provided in the pad (11), and the spiral direction of the reverse thread hole (12) is opposite to the rotation direction of the output shaft (1); a reverse thread stud (21) is provided vertically on the locking block (2); the reverse thread stud (21) cooperates with the reverse thread hole (12); a pin (22) is provided on the locking block (2); when the reverse thread stud (21) is screwed into the reverse thread hole (12), the locking block (2) cooperates with the pad (11) at the upper end of the output shaft (1) to lock the saw blade (3), and at the same time the pin (22) is inserted into the positioning hole of the saw blade (3).

2. The saw blade locking device according to claim 1, characterized in that, The upper end face of the pad (11) has a first plane (13); the lower end face of the locking block (2) has a second plane (23); when the reverse thread stud (21) is screwed into the reverse thread hole (12); the first plane (13) and the second plane (23) clamp the saw blade (3).

3. The saw blade locking device according to claim 1, characterized in that, The reverse thread stud (21) has an internal hexagonal hole (211) in the middle.

4. The saw blade locking device according to claim 1, characterized in that, There are two pins (22), and the two pins (22) are symmetrically arranged on the lower end face of the locking block (2).

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