Saw bow and using method thereof

Abstract

The saw bow comprises a main body assembly, the main body assembly comprises a bowstring box, a bowstring groove is formed in the lower portion of the bowstring box, and a main grip is connected to the upper portion of the bowstring box; the installation space adjusting assembly comprises a left bowstring and a right bowstring, the upper portion of the left bowstring and the upper portion of the right bowstring are inserted into the bowstring groove and rotationally connected to the bowstring box, the left bowstring and the right bowstring are symmetrically arranged about the center of the bowstring box in the left-right direction, and the left bowstring and the right bowstring swing in the opposite directions; the saw blade is connected to the lower ends of the left bowstring and the right bowstring; the saw blade with the corresponding length can be installed according to the saw depth requirement of a to-be-machined part, the tensioning force of the saw blade is convenient to adjust, and the technical problems that saw blades with different lengths are inconvenient to install in an existing saw bow and the tensioning force of the saw blade cannot be adjusted are solved.

Description

Technical Field

[0001] This invention relates to the field of fitter's tools, and in particular to a saw bow and its method of use. Background Technology

[0002] In the manufacturing industry, fitters primarily operate by hand, using simple tools such as saw bows. The saw bow is the core tool for fitter sawing operations, mainly used to install and tension the saw blade, serving as the medium through which the operator transmits power to the blade. For fitters to operate smoothly for extended periods, the saw bow's structure should be ergonomic and multifunctional. However, most existing saw bows are fixed in structure, unable to be adjusted to adapt to sawing operations, significantly impacting sawing efficiency and quality. Furthermore, the bowstring is often a pull-out design, preventing quick installation of the saw blade and affecting production efficiency. Moreover, the tightening of the saw blade relies on a locking nut, resulting in uncontrollable tightening force and a stiff feel. Novices often struggle to control the saw blade tension, severely affecting sawing operations. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problems existing in the above and / or existing fitter tools, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a saw bow and its usage method. This invention allows for the installation of saw blades of corresponding lengths according to the sawing depth requirements of the parts to be processed. The tension of the saw blades is easy to adjust, solving the technical problem that it is inconvenient to install saw blades of different lengths in existing saw bows and that the tension of the saw blades is not adjustable. To solve the above-mentioned technical problems, the present invention provides the following technical solution: a saw bow, comprising, The main components include a bowstring box, the lower part of which has a bowstring groove, and the upper part of which is connected to a main grip; Install the space adjustment components, including the left bowstring and the right bowstring. The upper parts of the left bowstring and the right bowstring are respectively inserted into the bowstring slots and rotatably connected to the bowstring box. The left bowstring and the right bowstring are centrally symmetrical about the bowstring box in the left and right directions, and the left bowstring and the right bowstring swing in opposite directions. The saw blade is attached to the lower ends of the left and right bowstrings.

[0006] As a preferred embodiment of the saw bow in this invention, wherein: a middle gear is rotatably connected in the bow string groove of the bow string box, the left bow string and the right bow string are respectively arranged at the left and right ends of the middle gear, the upper part of the left bow string has a number of left drive teeth that mesh with the middle gear, and the upper part of the right bow string has a number of right drive teeth that mesh with the middle gear.

[0007] As a preferred embodiment of the saw bow in this invention, wherein: a compacted fastening rod is rotatably connected to the bowstring box, a fastening gear is connected to the compacted fastening rod in the bowstring groove, a pressure plate is fixedly connected to the compacted fastening rod on the front side of the bowstring box, a clamping nut is threadedly connected to the compacted fastening rod on the rear side of the bowstring box, the compacted fastening rod has a compaction step, and the pressure plate is attached to the side of the compaction step away from the clamping nut.

[0008] As a preferred embodiment of the saw bow in this invention, a handle is detachably connected to the compacted fastening rod outside the pressure plate.

[0009] As a preferred embodiment of the saw bow in this invention, the lower ends of the left and right bowstrings are each provided with a pin on one side in the front-to-back direction, and the saw blade is inserted into the pin.

[0010] As a preferred embodiment of the saw bow in this invention, the pin has an annular groove with an arc-shaped inner edge, and the left and right ends of the saw blade have connection holes for easy mounting onto the pin.

[0011] As a preferred embodiment of the saw bow in this invention, the upper part of the bowstring box has a connecting hole, and the bowstring box on the right side of the connecting hole has a right fastening step hole. A first nut is fixedly connected to the main bow handle, and the first nut is threadedly connected to the bowstring box through the right fastening step hole.

[0012] As a preferred embodiment of the saw bow in this invention, it further includes a secondary handle, a left fastening step hole is provided on the bowstring box on the left side of the connecting hole, and a second nut is fixedly connected to the secondary handle, the second nut being threaded onto the bowstring box through the left fastening step hole.

[0013] As another object of the present invention, the present invention provides a method for using a saw bow, wherein: when installing the saw blade, the following steps are included: S1. Adjust the distance between the left and right bowstrings according to the length of the saw blade. Loosen the clamping nut and rotate the clamping rod. The clamping gear rotates and drives the left and right bowstrings to swing through the middle gear. When the left and right bowstrings swing to the appropriate position, stop rotating the clamping rod and tighten the clamping nut at the same time. S2. Simultaneously attach the saw blade to the two pins through the two connecting holes; S3. Loosen the clamping nut, rotate the clamping rod, and adjust the rotation direction of the clamping rod so that the left and right bowstrings open outwards, so that the left side of the left bowstring abuts against the pin on the inner edge of the left end groove, and the right side of the right bowstring abuts against the pin on the inner edge of the right end groove. The saw blade is tensioned. Tighten the clamping nut to complete the installation of the saw blade. When disassembling the saw blade, the following steps are included: Rotate the compaction fastening rod and adjust its rotation direction to cause the left and right bowstrings to retract inwards. When the groove of the pin leaves the left and right bowstrings, stop rotating the compaction fastening rod and remove the saw blade.

[0014] Compared with the prior art, the present invention has the following technical effects: 1. The separate design of the handle and bowstring box makes the sawing angle of the saw blade more flexible, and the extension length of the handle can also be adjusted, which is more in line with the operator's operating habits and helps to improve the efficiency and quality of sawing. 2. The saw blade can be installed with an appropriate length according to the required sawing depth of the part, thus enriching the working range of the saw bow; the saw blade is easy to install, and after installation, the clamping rod is rotated to open the left and right bowstrings outward, tightening the saw blade and improving the stability of the saw blade installation; the pin with a circular groove makes the saw blade installation more stable, and the saw blade will not jump out even if sawing is too forceful, greatly improving the safety of operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is the front view of the present invention.

[0016] Figure 2 This is a diagram showing the internal structure of the bowstring box in this invention.

[0017] Figure 3 This is a right view of the left bowstring in this invention.

[0018] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0019] Figure 5 A cross-sectional view of the saw blade being mounted on the pin.

[0020] Figure 6 This is a diagram of the internal structure of the present invention.

[0021] Figure 7 for Figure 6 A magnified view of a section at point B.

[0022] Figure 8 for Figure 6 The view at CC.

[0023] Figure 9 This is a three-dimensional structural diagram of a swivel handle fixedly connected to a clamped rod in a compacted state.

[0024] Figure 10 This is a schematic diagram of the fastening gear.

[0025] Figure 11 The present invention is equipped with a short saw blade (shorter than) Figure 1 The main view when the saw blade length is shown.

[0026] In the diagram, 1 is the bowstring box, 1-1 is the connecting hole, 1-2 is the bowstring groove, 2 is the main grip, 2-1 is the first connecting rod, 3 is the auxiliary grip, 3-1 is the second connecting rod, 4 is the second connecting cap, 5 is the left bowstring, 5-1 is the left drive gear, 6 is the right bowstring, 6-1 is the right drive gear, 7 is the pin, 7-1 is the groove, 8 is the saw blade, 9 is the first connecting cap, 10 is the handle, 11 is the clamping nut, 12 is the intermediate gear, 13 is the compacted fastening rod, 13-1 is the compaction step, 13-2 is the drive groove, 13-3 is the fixing hole, 14 is the fastening gear, 14-1 is the drive key, 15 is the pressure plate, and 16 is the fixing screw. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1: Refer to Figures 1-10 This embodiment provides a saw bow with a wider range of working conditions and the ability to adjust the sawing angle as needed to better suit the operator's operating habits.

[0031] A saw bow includes a main assembly, which includes a bowstring box 1. The lower part of the bowstring box 1 has bowstring grooves 1-2. The left and right ends of the upper part of the bowstring box 1 are respectively connected to a secondary handle 3 and a main handle 2. An installation space adjustment component is connected to the bowstring box 1, and a saw blade 8 of corresponding length is installed through the installation space adjustment component.

[0032] Specifically, the installation space adjustment component includes a left bowstring 5 and a right bowstring 6. The upper parts of the left bowstring 5 and the right bowstring 6 are respectively inserted into the bowstring grooves 1-2 and rotatably connected to the bowstring box 1. The left bowstring 5 and the right bowstring 6 are centrally symmetrical about the bowstring box 1 in the left-right direction. The left bowstring 5 and the right bowstring 6 swing in opposite directions. An intermediate shaft is connected to the bowstring box 1, and an intermediate gear 12 is rotatably connected to the intermediate shaft in the bowstring grooves 1-2. The left bowstring 5 and the right bowstring 6 are respectively positioned on the intermediate gear. At both ends of wheel 12, the upper part of the left bowstring 5 has several left drive teeth 5-1 that mesh with the middle gear 12, and the upper part of the right bowstring 6 has several right drive teeth 6-1 that mesh with the middle gear 12. A compacted fastening rod 13 is rotatably connected to the bowstring box 1. A fastening gear 14 is connected to the compacted fastening rod 13 in the bowstring groove 1-2. A transmission key 14-1 is fixed inside the fastening gear 14. The compacted fastening rod 13 has a transmission key 14-1 that engages with the transmission key 14-1. The moving groove 13-2 and the fastening gear 14 are sleeved on the compacted fastening rod 13 via the transmission key 14-1. A pressure plate 15 is fixedly connected to the compacted fastening rod 13 on the front side of the bowstring box 1. A clamping nut 11 is threadedly connected to the compacted fastening rod 13 on the rear side of the bowstring box 1. The compacted fastening rod 13 has a compaction step 13-1. The pressure plate 15 can fit against the side of the compaction step 13-1 away from the clamping nut 11. The compacted fastening rod 13 outside the clamping nut 11 can... A detachable handle 10 is connected. In this embodiment, the handle 10 is preferably a wing nut with a fixing hole 13-3. The compacted fastening rod 13 has a countersunk hole coaxial with the fixing hole 13-3. Before use, the wing nut is inserted into the compacted fastening rod 13, and the fixing screw 16 is screwed into the fixing hole 13-3 and the countersunk hole to fix the wing nut to the compacted fastening rod 13. The saw blade 8 is connected to the lower ends of the left bowstring 5 and the right bowstring 6.

[0033] During normal sawing, using a standard length saw blade 8, such as 300mm, rotate the wing nut. With the clamped state, the fastening rod 13 rotates, driving the fastening gear 14. The fastening gear 14, via the intermediate gear 12, drives the left bowstring 5 and right bowstring 6 on both sides to rotate. Adjust the rotation direction of the wing nut so that the left bowstring 5 and right bowstring 6 swing towards each other. When the left bowstring 5 and right bowstring 6 are in the ideal position, install the saw blade 8 onto the pins 7 of the left and right bowstrings 5 ​​and 6, and then rotate the wing nut in the opposite direction. The nut, left bowstring 5 and right bowstring 6 move in a direction away from each other. When the left bowstring 5 and right bowstring 6 tension the saw blade 8, the pressure plate 15 is used to press the compaction step 13-1, and the pressure plate 15 is fixedly connected to the bowstring box 1 using the fixing screw 16. The pressure plate 15 presses the compacted state fastening rod 13 onto the bowstring box 1 through the compaction step 13-1. The tightening nut 11 is screwed in until the tightening nut 11 is pressed against the back side of the bowstring box 1, locking the position of the compacted state fastening rod 13. At the same time, the saw blade 8 is locked, and normal sawing operation can be performed.

[0034] With the above structural design, a saw blade 8 of appropriate length can be installed according to the required sawing depth of the part, thus enriching the working range of the saw bow. The saw blade 8 is easy to install. After installation, the clamping rod 13 is rotated to open the left bowstring 5 and right bowstring 6 outward, tightening the saw blade 8 and improving the stability of the saw blade 8 installation. The pin 7 with an annular groove 7-1 makes the saw blade 8 more securely installed, and the saw blade 8 will not jump out even if sawing is too forceful, greatly improving the safety of operation.

[0035] Specifically, the lower ends of the left bowstring 5 and the right bowstring 6 are each provided with a pin 7 on one side in the front-back direction. The saw blade 8 is inserted into the pin 7. The pin 7 has an annular groove 7-1 with an arc-shaped inner edge. The left and right ends of the saw blade 8 are respectively provided with connecting holes 1-1 for easy fitting onto the pin 7.

[0036] The pin 7 has a groove 7-1. When the left bowstring 5 and the right bowstring 6 tension the saw blade 8, the pin 7 at the groove 7-1 fits against the saw blade 8. During sawing, under the restriction of the groove 7-1 on the pin 7, the saw blade 8 will not be ejected even if the sawing is too intense.

[0037] Specifically, the upper part of the bowstring box 1 has a connecting hole 1-1, which is preferably a threaded hole. The main handle is fixed with a first connecting rod 2-1 on the side opposite to the bowstring box 1, and the auxiliary handle 3 is fixed with a second connecting rod 3-1 on the side opposite to the bowstring box 1. The first connecting rod 2-1 and the second connecting rod 3-1 are respectively threaded with a first cap 9 and a second cap 4.

[0038] Before use, first screw the first connecting rod 2-1 on the main grip 2 and the second connecting rod 3-1 on the auxiliary grip 3 into the bowstring box 1 through the connecting hole 1-1 to a suitable length and rotate to a suitable angle. Then screw in the first cap 9 and the second cap 4. The first cap 9 and the second cap 4 abut against the two sides of the bowstring box 1 respectively. The main grip 2 and the auxiliary grip 3 are fixed relative to the bowstring box 1.

[0039] The separate design of the handle and bowstring box 1 makes the sawing angle of the saw blade 8 more flexible, and the extension length of the handle can also be adjusted, which is more in line with the operator's operating habits and helps to improve the efficiency and quality of sawing.

[0040] Example 2: Refer to Figures 1-10 This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that it provides a method for manufacturing a saw bow, including: When installing saw blade 8, the following steps are included: S1. Adjust the distance between the left bowstring 5 and the right bowstring 6 according to the length of the saw blade 8, loosen the clamping nut, rotate the clamping state fastening rod 13, the fastening gear 14 rotates, and the fastening gear 14 drives the left bowstring 5 and the right bowstring 6 to swing through the middle gear 12 respectively. When the left bowstring 5 and the right bowstring 6 swing to the appropriate position, stop rotating the clamping state fastening rod and tighten the clamping nut at the same time. S2. Simultaneously attach the saw blade 8 to the two pins 7 through the two connecting holes 1-1. S3. Loosen the clamping nut, rotate the clamping state fastening rod 13, and adjust the rotation direction of the clamping state fastening rod 13 so that the left bowstring 5 and the right bowstring 6 open outward, so that the left side of the left bowstring 5 abuts against the pin 7 on the inner edge of the left end groove 7-1, and the right side of the right bowstring 6 abuts against the pin 7 on the inner edge of the right end groove 7-1. The saw blade 8 is tensioned. Tighten the clamping nut to complete the installation of the saw blade 8. When disassembling saw blade 8, the following steps are included: Rotate the compaction state fastening rod 13 and adjust its rotation direction to cause the left bowstring 5 and right bowstring 6 to retract inward. When the groove 7-1 of the pin 7 leaves the left bowstring 5 and right bowstring 6, stop rotating the compaction state fastening rod 13 and remove the saw blade 8.

[0041] This embodiment enables the installation and tensioning of the saw blade 8. The installation and tensioning of the saw blade 8 are convenient. After tensioning, the left and right sides of the saw blade 8 are locked in the grooves 7-1 of the pins 7 at the left and right ends, preventing the saw blade 8 from jumping out due to excessive sawing force.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A saw bow, characterized in that: It includes, The main components include a bowstring box, the lower part of which has a bowstring groove, and the upper part of which is connected to a main grip; Install the space adjustment components, including the left bowstring and the right bowstring. The upper parts of the left bowstring and the right bowstring are respectively inserted into the bowstring slots and rotatably connected to the bowstring box. The left bowstring and the right bowstring are centrally symmetrical about the bowstring box in the left and right directions, and the left bowstring and the right bowstring swing in opposite directions. The saw blade is attached to the lower ends of the left and right bowstrings.

2. The saw bow as described in claim 1, characterized in that: The bowstring box has a central gear rotatably connected in the bowstring groove. The left and right bowstrings are respectively located at the left and right ends of the central gear. The upper part of the left bowstring has several left drive teeth that mesh with the central gear, and the upper part of the right bowstring has several right drive teeth that mesh with the central gear.

3. A saw bow as described in claim 2, characterized in that: A compaction fastening rod is rotatably connected to the bowstring box. A fastening gear is connected to the compaction fastening rod in the bowstring groove. A pressure plate is fixedly connected to the compaction fastening rod on the front side of the bowstring box. A clamping nut is threadedly connected to the compaction fastening rod on the rear side of the bowstring box. The compaction fastening rod has a compaction step, and the pressure plate is attached to the side of the compaction step away from the clamping nut.

4. A saw bow as described in claim 3, characterized in that: A handle is detachably connected to the compacted fastening rod outside the pressure plate.

5. A saw bow as described in claim 3, characterized in that: The lower ends of the left and right bowstrings are each provided with a pin on one side in the front-to-back direction, and the saw blade is inserted into the pin.

6. A saw bow as described in claim 5, characterized in that: The pin has an annular groove with an arc-shaped inner edge, and the left and right ends of the saw blade have connection holes for easy fitting onto the pin.

7. A saw bow as described in any one of claims 1 to 6, characterized in that: The upper part of the bowstring box has a connection hole, and the right side of the bowstring box has a right fastening step hole. The main handle is fixedly connected to the first nut, which is threaded onto the bowstring box through the right fastening step hole.

8. A saw bow as described in claim 7, characterized in that: It also includes a secondary grip, on which a left fastening step hole is opened on the bowstring box on the left side of the connection hole, and a second nut is fixedly connected to the secondary grip, and the second nut is threaded to the bowstring box through the left fastening step hole.

9. The method of using the saw bow as described in any one of claims 6 to 8, characterized in that: When installing a saw blade, the following steps are included: S1. Adjust the distance between the left and right bowstrings according to the length of the saw blade. Loosen the clamping nut and rotate the clamping rod. The clamping gear rotates and drives the left and right bowstrings to swing through the middle gear. When the left and right bowstrings swing to the appropriate position, stop rotating the clamping rod and tighten the clamping nut at the same time. S2. Simultaneously attach the saw blade to the two pins through the two connecting holes; S3. Loosen the clamping nut, rotate the clamping rod, and adjust the rotation direction of the clamping rod so that the left and right bowstrings open outwards, so that the left side of the left bowstring abuts against the pin on the inner edge of the left end groove, and the right side of the right bowstring abuts against the pin on the inner edge of the right end groove. The saw blade is tensioned. Tighten the clamping nut to complete the installation of the saw blade. When disassembling the saw blade, the following steps are included: Rotate the compaction fastening rod and adjust its rotation direction to cause the left and right bowstrings to retract inwards. When the groove of the pin leaves the left and right bowstrings, stop rotating the compaction fastening rod and remove the saw blade.

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