Competition-level high-precision bench worker saw bow

Abstract

The utility model provides a competition-level high-precision bench worker saw bow which comprises a front half beam, a rear half beam, a machine frame, a quick release mechanism, an adjustable tensioning mechanism and a handle, and the front half beam and the rear half beam are each of an L-shaped structure; one end of the front half beam is connected with one end of the machine frame through a quick release mechanism, and the other end of the front half beam is provided with a front pull rod sleeve; the front pull rod penetrates through the front pull rod sleeve, one end far away from the rear half beam limits the front pull rod to move towards the rear half beam through a radial pin shaft, and the other end is provided with a radial hanging pin for mounting a saw blade; one end of the rear half beam is fixedly connected to the other end of the machine frame, and the other end is provided with a rear pull rod sleeve; one end of the rear pull rod penetrates through the rear pull rod sleeve and then is coaxially connected with the handle through threads, the rear pull rod can be pulled to move in the axial direction by rotating the handle, and the other end of the rear pull rod is provided with a radial hanging pin used for installing a saw blade. The device is high in precision and can be quickly disassembled, so that the sawing precision of bench workers and the use convenience are improved.

Description

Technical Field

[0001] This invention relates to a saw bow structure for a bow saw. Background Technology

[0002] Currently, with the advancement of industrialization, high-end manufacturing is booming, and machining equipment and tools are constantly evolving. However, the research and development of traditional hand tools has almost stagnated. Take fitter's saws, for example. The saws currently on the market are almost indistinguishable from those from decades ago, made by sheet metal stamping and riveting. Their poor machining and fitting precision leads to problems such as uneven saw body straightness and poor precision in the saw blade tie rod fitting, failing to meet the requirements of high-precision sawing, especially in competitions and certification exams where high precision is crucial.

[0003] A good bow saw should have the following characteristics:

[0004] 1) The saw blade should not be twisted after installation;

[0005] 2) After installing the saw blade, the saw blade's cutting stroke should be as long as possible;

[0006] 3) The saw bow should swing as little as possible from side to side during sawing;

[0007] 4) The saw blade should have as many adjustable angles as possible;

[0008] 5) It should be as convenient to use as possible.

[0009] The Swedish Begoo 325 saw bow is a representative high-end saw bow, but it only meets the first characteristic mentioned above, while domestically produced sheet metal saw bows only meet the second characteristic.

[0010] Currently, there is no saw that can simultaneously meet all five of the above characteristics. Summary of the Invention

[0011] To overcome the shortcomings of existing technologies, this invention provides a competition-grade high-precision fitter's saw bow, which is highly accurate and can be quickly disassembled and reassembled, thereby improving the precision of fitter's sawing and the ease of use.

[0012] The technical solution adopted by the present invention to solve its technical problem is: a competition-grade high-precision fitter's saw bow, including a front half beam, a rear half beam, a frame, a quick-release mechanism, an adjustable tensioning mechanism, and a handle.

[0013] Both the front and rear beams are L-shaped structures. One end of the front beam is connected to one end of the machine frame via a quick-release mechanism, and the other end is fitted with a front pull rod sleeve. The front pull rod passes through the front pull rod sleeve, and its end away from the rear beam is restricted from moving towards the rear beam by a radial pin. The other end is equipped with a radial hook for mounting the saw blade. One end of the rear beam is fixed to the other end of the machine frame, and the other end is fitted with a rear pull rod sleeve. One end of the rear pull rod passes through the rear pull rod sleeve and is coaxially connected to the handle via a thread. Rotating the handle allows the rear pull rod to move axially. The other end is equipped with a radial hook for mounting the saw blade.

[0014] The quick-release mechanism includes a quick-release wrench and a connecting rod. The front end of the quick-release wrench has two pin holes, and the rear end is a manual force-applying rod. One pin hole is pinned to the front half beam, and the other pin hole is pinned to one end of the connecting rod. The other end of the connecting rod is pinned to the machine frame.

[0015] The two pin holes of the quick-release wrench have a height difference, with the pin hole closer to the rear half beam being lower.

[0016] The front tie rod, front tie rod sleeve, rear tie rod, and rear tie rod sleeve are all machined using CNC machine tools.

[0017] The aforementioned front pull rod uses a cylindrical pin and semi-circular groove for positioning. The front end of the front pull rod sleeve is machined with four pairs of semi-circular grooves arranged in a star pattern, which cooperate with the radial pin of the pull rod for positioning. When the radial cylindrical pin is placed in the semi-circular grooves at different angles, a saw blade with different installation angles can be obtained, with a minimum adjustment angle of 45°.

[0018] The rear pull rod is positioned by an octagonal shaft and an inner nut in the handle. The cross-section of the rear pull rod is octagonal, and the cross-section of the inner hole of the rear pull rod sleeve is also octagonal. The inner and outer clearances are fitted together. When the rear pull rod is rotated to different angles and inserted into the rear pull rod sleeve, a saw blade with different installation angles can be obtained. The minimum adjustment angle is 45°.

[0019] The hanging pin passes radially through the front and rear pull rods, with one end being rounded to facilitate entry into the saw blade hole; the other end is flat and its length is only the thickness of the saw blade, used to cut off protrusions along their roots.

[0020] The fasteners between the machine frame and the quick-release mechanism, the machine frame and the front half beam, the machine frame and the rear half beam, the front tie rod sleeve and the front half beam, and the rear tie rod sleeve and the rear half beam are all butt screws.

[0021] The beneficial effects of this invention are:

[0022] (1) The front and rear saw blade tie rods and tie rod sleeves are all processed by CNC machine tools. The front tie rod is positioned by a cylindrical and semi-circular groove, and the rear tie rod is positioned by an octagonal shaft and the inner nut of the handle. The gap is much smaller than that of sheet metal stamping parts, so the saw blade does not twist after installation.

[0023] (2) After the entire saw blade is installed, it is within the frame of the saw bow. It will not hit the front and rear beams after the saw blade has traveled its full stroke. After the saw blade is installed, the saw blade can cut a long distance.

[0024] (3) Most of the saw bows sold in China are vertical grips, with the point of force exertion in the middle of the grip and 3-5cm higher than the saw blade. This invention draws on the force exertion method of a file, adopts a straight handle, and the point of force exertion is collinear with the saw blade, so that the saw blade is less likely to swing left and right due to the force exerted by the joints of the right hand. The saw bow swings left and right less during sawing.

[0025] (4) The minimum adjustment range of a regular saw bow is 90°, while the minimum adjustment range of this invention is 45°, making it suitable for various occasions and allowing for multiple adjustable angles of the saw blade.

[0026] (5) Ordinary saw bows are locked with butterfly nuts. This invention integrates the screw sleeve with the handle for easy operation. This invention adopts a herringbone quick-release mechanism, which is controlled by the quick-release handle. The front half beam is moved forward and backward by rotating the connecting rod. The saw blade hanger has a round head design for easy access to the saw blade hole. The saw blade can be installed on both sides of the saw blade hanger. When installed on the reverse side, it can be used to cut off protrusions along the root.

[0027] (6) The present invention has a quick disassembly and quick assembly function, which is different from the saw bow sold on the market and has higher reliability. The main body of the present invention can be processed with materials such as stainless steel and titanium alloy, which does not rust and is easy to maintain. The frame and quick disassembly mechanism, front and rear half beams and front and rear tie rod sleeves and front and rear half beams of the present invention are fixed with butt screws instead of disposable rivets, and each part can be disassembled for maintenance. Attached Figure Description

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 This is a schematic diagram of the quick-release structure of the present invention.

[0030] Figure 3 This is a schematic diagram of the front tie rod structure of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure of the rear pull rod and handle nut of the present invention.

[0032] Figure 5 This is a schematic diagram of the pin of the present invention.

[0033] In the diagram, 1-front half beam, 2-frame, 3-quick release mechanism, 4-rear half beam, 5-front tie rod sleeve, 6-front tie rod, 7-hook pin, 8-rear tie rod, 9-rear tie rod sleeve, 10-handle, 11-quick release wrench, 12-connecting rod. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. The present invention includes, but is not limited to, the following embodiments.

[0035] A competition-grade high-precision fitter's saw bow includes a front half beam, a rear half beam, a frame, a quick-release mechanism, an adjustable tensioning mechanism, and a handle.

[0036] Both the front and rear beams are L-shaped structures. One end of the front beam is connected to one end of the machine frame via a quick-release mechanism, and the other end is fitted with a front pull rod sleeve. The front pull rod passes through the front pull rod sleeve, and its end away from the rear beam is restricted from moving towards the rear beam by a radial pin. The other end is equipped with a radial hook for mounting the saw blade. One end of the rear beam is fixed to the other end of the machine frame, and the other end is fitted with a rear pull rod sleeve. One end of the rear pull rod passes through the rear pull rod sleeve and is coaxially connected to the handle via a thread. Rotating the handle allows the rear pull rod to move axially. The other end is equipped with a radial hook for mounting the saw blade.

[0037] The quick-release mechanism includes a quick-release wrench and a connecting rod, such as Figure 2 As shown, the quick-release wrench has two pin holes machined at the front end and a manual lever at the rear. One pin hole connects to the front half-beam, and the other pin hole connects to one end of the connecting rod, with the other end of the connecting rod connected to the machine frame. The position of the front half-beam is adjusted by rotating the quick-release wrench. When the wrench is pulled up, it moves the front half-beam inwards towards the machine frame, at which point the saw blade is installed. Then, the wrench is pressed down, moving the front half-beam outwards towards the machine frame to tighten the saw blade. If the movement of the front half-beam causes the saw blade to be too tight or not tight enough, the distance between the front and rear levers can be adjusted by rotating the handle further.

[0038] The two pin holes of the quick-release wrench have a height difference, with the pin hole near the rear half beam being lower, so the quick-release wrench will self-lock after being pressed down to the end.

[0039] The front tie rod, front tie rod sleeve, rear tie rod, and rear tie rod sleeve are all machined using CNC machine tools.

[0040] The aforementioned front tie rod is positioned using a cylindrical pin and a semi-circular groove, such as... Figure 3 As shown, the front end of the front tie rod sleeve has four pairs of semi-circular grooves arranged in a star pattern, which mate with the radial cylindrical pins of the tie rod for positioning. When the radial cylindrical pins are placed in the semi-circular grooves at different angles, saw blades with different installation angles can be obtained, with a minimum adjustment angle of 45°.

[0041] The rear pull rod is positioned by an octagonal shaft and an inner nut in the handle. The cross-section of the rear pull rod is octagonal, and the cross-section of the inner hole of the rear pull rod sleeve is also octagonal. The inner and outer clearances are fitted together. When the rear pull rod is rotated to different angles and inserted into the rear pull rod sleeve, a saw blade with different installation angles can be obtained. The minimum adjustment angle is 45°.

[0042] The hanging pin passes radially through the front and rear pull rods, with one end being rounded to facilitate entry into the saw blade hole; the other end is flat and its length is only the thickness of the saw blade, used to cut off protrusions along their roots.

[0043] The fasteners between the machine frame and the quick-release mechanism, the machine frame and the front half beam, the machine frame and the rear half beam, the front tie rod sleeve and the front half beam, and the rear tie rod sleeve and the rear half beam are all butt screws.

[0044] like Figures 1 to 5 As shown, an embodiment of the present invention provides a competition-grade high-precision fitter's saw bow, which increases sawing accuracy and ease of use.

[0045] The present invention relates to a competition-grade high-precision fitter's saw bow, which consists of a front half beam, a rear half beam, a frame, a quick-release mechanism, an adjustable tensioning mechanism, and a handle.

[0046] The rear beam is fixed to the machine frame, while the front beam can move back and forth along the machine frame to achieve quick clamping of the saw blade. The front pull rod, quick release wrench, and connecting rod form a quick release mechanism. When the quick release wrench is pulled up, the front beam moves backward, and the saw blade is loosened. When the quick release wrench is pressed down, the front beam moves forward, and the saw blade is tightened.

[0047] The front tie rod has a clearance fit with the shaft and is positioned by a pin passing through it and a semi-circular groove in the front tie rod sleeve. It can rotate in eight different directions and fits with the semi-circular grooves in a star-shaped pattern. The rear tie rod has an octagonal shaft and a clearance fit with the rear tie rod sleeve. Its position is adjusted by a threaded sleeve embedded in the handle. Both the front and rear tie rods can be rotated in eight different directions and installed in the tie rod sleeve.

[0048] The pin passes radially through the front and rear tie rods, allowing the saw blade to be installed in either direction. One end is rounded for easy access into the saw blade hole; the other end is flat and its length is only the thickness of the saw blade, used to cut off protrusions along their roots.

[0049] When using this invention, first lift the quick-release wrench, use the handle to adjust the front and rear levers to the appropriate position for the saw blade installation, then press down the quick-release wrench. The front beam will move forward accordingly, thereby tightening the saw blade. It is worth noting that if the saw blade is still not tight enough at this point, you can continue to turn the handle to tighten it. Commercially available saw bows with quick-release functions cannot continue to tighten the saw blade while the quick-release mechanism is locked; it is necessary to open the quick-release mechanism to adjust the lever distance.

[0050] After installing the saw blade, hold the handle with your right hand as you would hold a file, and support the front beam with your left hand. Apply force back and forth to begin sawing.

Claims

1. A competition-grade high-precision fitter's saw bow, comprising a front half-beam, a rear half-beam, a frame, a quick-release mechanism, an adjustable tensioning mechanism, and a handle, characterized in that, Both the front and rear beams are L-shaped structures. One end of the front beam is connected to one end of the machine frame via a quick-release mechanism, and the other end is fitted with a front pull rod sleeve. The front pull rod passes through the front pull rod sleeve, and its end away from the rear beam is restricted from moving towards the rear beam by a radial pin. The other end is equipped with a radial hook for mounting the saw blade. One end of the rear beam is fixed to the other end of the machine frame, and the other end is fitted with a rear pull rod sleeve. One end of the rear pull rod passes through the rear pull rod sleeve and is coaxially connected to the handle via a thread. Rotating the handle allows the rear pull rod to move axially. The other end is equipped with a radial hook for mounting the saw blade.

2. The competition-grade high-precision fitter's saw bow according to claim 1, characterized in that, The quick-release mechanism includes a quick-release wrench and a connecting rod. The front end of the quick-release wrench has two pin holes, and the rear end is a manual force-applying rod. One pin hole is pinned to the front half beam, and the other pin hole is pinned to one end of the connecting rod. The other end of the connecting rod is pinned to the machine frame.

3. The competition-grade high-precision fitter's saw bow according to claim 2, characterized in that, The two pin holes of the quick-release wrench have a height difference, with the pin hole closer to the rear half beam being lower.

4. The competition-grade high-precision fitter's saw bow according to claim 1, characterized in that, The front tie rod, front tie rod sleeve, rear tie rod, and rear tie rod sleeve are all machined using CNC machine tools.

5. The competition-grade high-precision fitter's saw bow according to claim 1, characterized in that, The front pull rod is positioned by a cylindrical pin and a semi-circular groove. The front end of the front pull rod sleeve is machined with four pairs of semi-circular grooves distributed in a star pattern, which are positioned in conjunction with the radial pin of the pull rod. When the radial cylindrical pin is placed in the semi-circular groove at different angles, a saw blade with different installation angles can be obtained, with the minimum adjustment angle being 45°.

6. The competition-grade high-precision fitter's saw bow according to claim 1, characterized in that, The rear pull rod is positioned by an octagonal shaft and an inner nut in the handle. The cross-section of the rear pull rod is octagonal, and the cross-section of the inner hole of the rear pull rod sleeve is also octagonal. The inner and outer clearances are fitted together. When the rear pull rod is rotated to different angles and inserted into the rear pull rod sleeve, a saw blade with different installation angles can be obtained. The minimum adjustment angle is 45°.

7. The competition-grade high-precision fitter's saw bow according to claim 1, characterized in that, The hanging pin passes radially through the front and rear tie rods, with one end having a round head and the other end having a flat head, and its length is only the thickness of the saw blade.

8. The competition-grade high-precision fitter's saw bow according to claim 1, characterized in that, The fasteners between the machine frame and the quick-release mechanism, the machine frame and the front half beam, the machine frame and the rear half beam, the front tie rod sleeve and the front half beam, and the rear tie rod sleeve and the rear half beam are all butt screws.

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