Improved handheld steel saw

Abstract

The utility model discloses an improved handheld steel saw, and belongs to the technical field of cutting tools. Comprising an upper saw bow and a lower saw bow which are both provided with saw blades, two pairs of limiting stop levers are vertically installed in the lower saw bow, each pair of limiting stop levers is provided with a fastening adjusting piece used for fixing the saw blades, the top of the upper saw bow is fixedly connected with an anti-disengaging plate allowing each pair of limiting stop levers to penetrate through, each pair of limiting stop levers penetrates through the anti-disengaging plate and is provided with a top cover, and the top cover is fixedly connected with the upper saw bow. An elastic piece is installed between the top cover and the anti-disengaging plate, a grab handle is fixedly connected to one end of the upper saw bow, a supporting frame is elastically connected to the side, close to the grab handle, of the top of the upper saw bow, and a shifting frame is installed between the two pairs of limiting stop rods and the supporting frame in a penetrating mode. The two pairs of limiting stop levers are vertically installed in the lower saw bow, and the fastening adjusting pieces are installed on each pair of limiting stop levers, so that multi-point fixation of the saw blades is achieved, the stability of switching use of the double saw blades is effectively improved, and shaking in the sawing process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to an improved handheld hacksaw. Background Technology

[0002] In manual sawing operations, handheld hacksaws are a common tool widely used for cutting various materials such as wood and metal. When using them, you hold the handle and saw from one side to the other.

[0003] The existing patent application, with publication number CN204912923U and publication date of December 30, 2015, is titled "A Hacksaw for Improving Cutting Efficiency." This patent includes a hacksaw connecting frame, a handle mounted on the connecting frame, a sliding rod installed on the connecting frame, and an upper saw blade and a lower saw blade connected between the sliding rod and the connecting frame. The distance between the upper and lower saw blades can be adjusted according to the size of the workpiece. The teeth of the upper and lower saw blades are aligned. A cross-shaped adjustment bracket for adjusting the tension of the saw blade is also connected to the upper end of the upper saw blade. When cutting materials, this invention, due to the sliding rod, allows adjustment of the height between the upper and lower saw blades according to the size of the material to be cut, achieving the optimal cutting position. Pulling the handle causes the upper and lower saw blades to act simultaneously on the upper and lower ends of the material, greatly improving cutting efficiency.

[0004] Currently, handheld hacksaws sold on the market consist of a single saw bow and a saw blade fastened with bolts. Due to the monotonous back-and-forth motion, they are prone to causing fatigue. Adding a second saw blade below the first one makes operation less convenient. If jamming occurs during the cutting process, it is difficult to separate the saw blade from the material being cut, and the saw blade can easily fall off due to improper operation, posing a safety hazard to the user. Utility Model Content

[0005] The purpose of this invention is to provide an improved handheld hacksaw to overcome the aforementioned shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an improved handheld hacksaw, comprising an upper saw bow and a lower saw bow, each equipped with a saw blade. Two pairs of limiting rods are vertically installed inside the lower saw bow. Each pair of limiting rods is equipped with a fastening adjustment component for fixing the saw blade. An anti-detachment plate is fixedly connected to the top of the upper saw bow, through which each pair of limiting rods passes. Each pair of limiting rods passes through the anti-detachment plate and is equipped with a top cover. An elastic element is installed between the top cover and the anti-detachment plate. A handle is fixedly connected to one end of the upper saw bow. A support frame is elastically connected to the top of the upper saw bow near the handle. A lever is installed through the two pairs of limiting rods and the support frame. A support rod is fixedly connected inside each pair of limiting rods. A wedge-shaped abutment block that abuts against the support rod is fixedly connected to the bottom of the lever. One-way check teeth are symmetrically installed inside the support frame. A pressure rod that engages with the one-way check teeth is elastically slidably connected in the lever.

[0007] Preferably, the two sides of the saw blade are respectively attached to the inner sides of two pairs of limiting stops, and the upper saw bow is vertically provided with a groove that matches the limiting stops.

[0008] Preferably, the upper saw bow has a pair of diagonal braces elastically hinged at the end away from the handle, and a fixing strip is installed at one end of the lower saw bow below the diagonal braces, with an anti-slip pad strip installed on the top of the fixing strip.

[0009] Preferably, the elastic element includes a hydraulic telescopic rod, the bottom end of which is fixed to the anti-detachment plate, the top end of which abuts against the top cover, and a top spring is sleeved on the hydraulic telescopic rod.

[0010] Preferably, the fastening adjustment component includes a fastening bolt, each pair of limit stops has a vertical through groove for the fastening bolt to pass through, the saw blade in the upper saw bow has a positioning hole for the fastening bolt to pass through, and the fastening bolt passes through the through groove and the positioning hole and is threadedly connected to an adjusting nut.

[0011] Preferably, protective plates are fixedly connected to both sides of the top cover, and multiple fasteners are installed on the top of the top cover. The top cover is fixed to the limiting stop bar by the fasteners.

[0012] Preferably, a slider is fixedly connected to the bottom of the support frame, and a groove matching the slider is horizontally opened on the top of the upper saw bow. A compression spring that abuts against the slider is fixedly connected to one side of the inner wall of the groove.

[0013] Preferably, a handle is fixedly connected to one end of the lever near the grip, and the handle is provided with an anti-slip mesh pattern.

[0014] This utility model provides an improved handheld hacksaw. It has the following advantages:

[0015] This improved handheld hacksaw features two pairs of vertically installed limit bars inside the lower saw bow, with fastening adjustment components on each pair. This multi-point fixation of the saw blade effectively improves the stability of switching between the two saw blades, reduces shaking during sawing, and enhances sawing accuracy and efficiency. Simultaneously, an elastic element connects the top cover to the anti-detachment plate, allowing the lower saw bow to adaptively adjust the distance between itself and the upper saw bow during sawing. In use, the workpiece is clamped between the two saw blades, allowing both blades to simultaneously saw the workpiece towards the center, accelerating sawing efficiency. The anti-detachment plate also supports the two pairs of limit bars, preventing accidental blade detachment and safety risks. Furthermore, when sawing is obstructed, pulling the lever quickly increases the distance between the upper and lower saw blades, separating the blade from the material, making it convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an improved handheld hacksaw proposed in this utility model;

[0017] Figure 2 This is a partial sectional view of an improved handheld hacksaw proposed in this utility model;

[0018] Figure 3 In this utility model Figure 2 Enlarged view of the structure at point A;

[0019] Figure 4 This is a schematic diagram of the upper saw bow in an improved handheld hacksaw proposed in this utility model.

[0020] Legend:

[0021] 1. Upper saw bow; 101. Anti-detachment plate; 102. Handle; 103. Slot; 104. Diagonal brace; 105. Slide groove; 106. Compression spring; 2. Lower saw bow; 201. Fixing strip; 202. Anti-slip pad; 3. Saw blade; 301. Positioning hole; 4. Limit stop bar; 401. Top cover; 402. Support rod; 403. Through groove; 404. Protective plate; 405. Fastener; 5. Fastening adjustment component; 501. Fastening bolt; 502. Adjusting nut; 6. Elastic component; 601. Hydraulic telescopic rod; 602. Top spring; 7. Support frame; 701. One-way check tooth; 702. Slider; 8. Lever; 801. Wedge-shaped abutment block; 802. Pressure rod; 803. Handle. Detailed Implementation

[0022] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1-4An improved handheld hacksaw includes an upper saw bow 1 and a lower saw bow 2, both equipped with saw blades 3. Both the upper and lower saw bows 1 and 2 have mounting structures for fixing the saw blades 3. Two pairs of limiting rods 4 are vertically installed inside the lower saw bow 2. Each pair of limiting rods 4 is equipped with a fastening adjustment piece 5 for fixing the saw blades 3. Tightening the fastening adjustment piece 5 fixes the limiting rods 4 to the saw blades 3 in the upper saw bow 1, thus maintaining a fixed distance between the upper and lower saw blades 3. This allows for the adjustment of the upper and lower saw blades 3 during sawing. When switching between uses, the top of the upper saw bow 1 is fixedly connected to an anti-detachment plate 101 through which each pair of limit stops 4 passes. Each pair of limit stops 4 passes through the anti-detachment plate 101 and is fitted with a top cover 401. An elastic element 6 is installed between the top cover 401 and the anti-detachment plate 101. One end of the upper saw bow 1 is fixedly connected to a handle 102. A support frame 7 is elastically connected to the top of the upper saw bow 1 near the handle 102. A lever 8 is installed through the two pairs of limit stops 4 and the support frame 7. Each pair of limit stops 4 is fixedly connected to a support rod 402 inside. The bottom of the support frame 8 is fixedly connected to a wedge-shaped abutment block 801 that abuts against the support rod 402. One-way check teeth 701 are symmetrically installed inside the support frame 7. A pressure rod 802 that engages with the one-way check teeth 701 is elastically slidably connected in the shift frame 8. The wedge-shaped abutment block 801 abuts against the support rod 402 inside the limit stop 4 and is used to push the support rod 402 and the limit stop 4 downward when the shift frame 8 moves. In the shift frame 8, the pressure rod 802 is elastically slidably connected and is designed to engage with the one-way check teeth 701. To prevent the wedge-shaped abutment block 801 on the lever 8 from moving upward when pressing against the pressure rod 802, during use, the user holds the handle 102 and places the workpiece between the upper and lower saw blades 3. The saw blade 3 can be firmly fixed to the limit stop bar 4 by adjusting the fastening adjustment part 5. The upper and lower saw blades 3 can be switched during sawing. Alternatively, the fastening adjustment part 5 can be loosened. Due to the action of the elastic part 6, the lower saw bow 2 can adaptively adjust the distance between itself and the upper saw bow 1 according to the force during the sawing process, so that the saw blade 3 remains stable. The two saw blades 3 simultaneously saw the workpiece towards the center, improving sawing efficiency. When sawing is obstructed, the user can also pull the lever 8 and use the abutment action of the wedge-shaped abutment block 801 and the support rod 402 to quickly increase the distance between the upper and lower saw blades 3, separating the saw blades 3 from the material. At the same time, the design of the one-way check tooth 701 and the pressure rod 802 ensures that the lever 8 will not tilt upwards when pulled, ensuring the stability of the pull and making it more convenient to use.

[0024] In this invention, the saw blade 3 is fitted with the inner sides of two pairs of limiting stops 4 on both sides, and the upper saw arch 1 has a vertically formed groove 103 that matches the limiting stops 4. During installation, the saw blade 3 is first passed through the gap between each pair of limiting stops 4, ensuring that its two sides are tightly fitted to the inner sides of the limiting stops 4. Then, the corresponding saw blade 3 is fixed on the upper saw arch 1 and the lower saw arch 2. Because the groove 103 matches the shape of the limiting stops 4, it ensures that the limiting stops 4 will not shake or shift during insertion and adjustment. Therefore, the saw blade 3 remains stable during sawing and is not prone to shaking or shifting. This design not only improves the accuracy and efficiency of sawing but also effectively reduces the wear and breakage risk of the saw blade 3, thereby extending the service life of the saw blade 3.

[0025] In this invention, the upper saw bow 1, at the end furthest from the handle 102, is elastically hinged with a pair of diagonal bracing rods 104. A fixing strip 201 is installed below the diagonal bracing rods 104 at one end of the lower saw bow 2. An anti-slip pad 202 is installed on the top of the fixing strip 201. A torsion spring is sleeved on the hinge shaft between the diagonal bracing rods 104 and the upper saw bow 1. When using this improved handheld hacksaw for sawing operations, the diagonal bracing rods 104 maintain a certain tension under the action of the elastic hinge, working together with the fixing strip 201 and the anti-slip pad 202 to form a stable triangular support structure. This structure not only enhances the overall stability of the saw bow but also makes the saw bow easier to control during sawing, reducing shaking and deviation during the sawing process. Meanwhile, the anti-slip pad 202 increases the friction between the pad and the workpiece, further preventing the saw bow from sliding. When the material moves from the outside towards the middle of the two saw blades 3 and hits the diagonal brace 104, the diagonal brace 104 will automatically flip to avoid it, and then flip back to its original position under the force of the torsion spring, allowing the material to enter in more diverse directions.

[0026] In this utility model, the elastic element 6 includes a hydraulic telescopic rod 601. The bottom end of the hydraulic telescopic rod 601 is fixed to the anti-detachment plate 101, and the top end of the hydraulic telescopic rod 601 abuts against the top cover 401. A top spring 602 is sleeved on the hydraulic telescopic rod 601. When the saw blade 3 needs to adjust the sawing depth, the hydraulic telescopic rod 601 and the top spring 602 can respond quickly and provide additional elastic support for the lower saw blade 3. This allows the lower saw bow 2 to better adapt to the surface changes of the workpiece during the sawing process, so that the two upper and lower saw blades 3 work together on the workpiece being cut, ensuring that the sawing operation is efficient, accurate and stable.

[0027] In this utility model, the fastening adjustment component 5 includes a fastening bolt 501. Each pair of limit stops 4 has a vertical through groove 403 for the fastening bolt 501 to pass through. The saw blade 3 in the upper saw bow 1 has a positioning hole 301 for the fastening bolt 501 to pass through. The fastening bolt 501 passes through the through groove 403 and the positioning hole 301 and is threadedly connected to an adjusting nut 502. When preparing to switch between the upper and lower saw blades 3 for sawing, the operator can adjust the clamping force of the fastening bolt 501 on the saw blade 3 by rotating the adjusting nut 502. Since the fastening bolt 501 can move up and down along the through groove 403 on the limit stop 4, and the saw blade 3 has a hole that matches the positioning hole 301, we can precisely adjust the height of the lower saw bow 2 as needed. This design not only improves the flexibility of using the saw blade 3, but also ensures the stability and durability of the saw blade 3 during the sawing process.

[0028] In this utility model, protective plates 404 are fixedly connected to both sides of the top cover 401, and multiple fasteners 405 are installed on the top of the top cover 401. The top cover 401 is fixed to the limiting stop bar 4 by the fasteners 405. The top cover 401 and the protective plates 404 on both sides together form a protective barrier, which can prevent the top spring 602 from accidentally popping out and causing safety hazards. At the same time, the top cover 401 is firmly fixed to the limiting stop bar 4 by the fasteners 405, which can facilitate subsequent disassembly. After removing the top cover 401, the two pairs of limiting stop bars 4 can be pulled out from the anti-detachment plate 101, thereby separating the upper saw bow 1 and the lower saw bow 2, which is convenient for maintenance and storage.

[0029] In this utility model, a slider 702 is fixedly connected to the bottom of the support frame 7, and a groove 105 matching the slider 702 is horizontally opened on the top of the upper saw bow 1. A compression spring 106 that abuts against the slider 702 is fixedly connected to one side of the inner wall of the groove 105. The compression spring 106 can push the support frame 7 toward the pressure rod 802 so that after the lower saw bow 2 lifts the lever 8, the pressure rod 802 can quickly engage with the one-way check tooth 701 in the support frame 7, so that when the lever 8 is pulled later, the lever 8 moves on a relatively fixed horizontal line, thereby quickly adjusting the distance between the upper and lower saw bows 2, which makes it convenient for the saw blade 3 to be separated from the workpiece for secondary sawing operations.

[0030] In this utility model, a handle 803 is fixedly connected to one end of the lever 8 near the handle 102. The handle 803 is provided with anti-slip texture. During operation, the user can hold the handle 102 with one hand and the handle 803 with anti-slip texture with the other hand to operate the lever 8 conveniently. Whether making fine adjustments or increasing the distance between the two saw blades 3, stable and precise control can be obtained. The anti-slip texture design increases the friction between the user's palm and the handle 803, effectively preventing slippage or drop due to wet or fatigued hands, and improving the user's control over the entire tool.

[0031] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An improved handheld steel saw, comprising an upper saw bow (1) and a lower saw bow (2) each mounted with a saw blade (3), characterized in that: two pairs of limiting stop rods (4) are vertically mounted in the lower saw bow (2), each pair of limiting stop rods (4) is mounted with a fastening adjusting piece (5) for fixing the saw blade (3), the top of the upper saw bow (1) is fixedly connected with a anti-off plate (101) through which each pair of limiting stop rods (4) passes, each pair of limiting stop rods (4) passes through the anti-off plate (101) and is mounted with a top cover (401), and an elastic piece (6) is mounted between the top cover (401) and the anti-off plate (101); one end of the upper saw bow (1) is fixedly connected with a handle (102), the top of the upper saw bow (1) is elastically connected with a support frame (7) on the side close to the handle (102), a push frame (8) is installed through the two pairs of limiting stop rods (4) and the support frame (7), each pair of limiting stop rods (4) is fixedly connected with a supporting rod (402) inside, the bottom of the push frame (8) is fixedly connected with a wedge-shaped abutting block (801) which abuts against the supporting rod (402), the support frame (7) is symmetrically mounted with a one-way check tooth (701) inside, and the push frame (8) is elastically and slidably connected with a pressing rod (802) which is clamped with the one-way check tooth (701). The two surfaces of the saw blade (3) are respectively fitted with the inner sides of the two pairs of limiting stop rods (4), and the upper saw bow (1) is vertically provided with a clamping groove (103) which matches the limiting stop rods (4). The end of the upper saw bow (1) away from the handle (102) is elastically hinged with a pair of inclined support rods (104), the lower end of the lower saw bow (2) is mounted with a fixed strip (201) below the inclined support rods (104), and the top of the fixed strip (201) is mounted with a non-slip pad strip (202).

2. The improved hand-held steel saw as claimed in claim 1 wherein, The elastic piece (6) comprises a hydraulic telescopic rod (601), the bottom end of the hydraulic telescopic rod (601) is fixed with the anti-off plate (101), the top end of the hydraulic telescopic rod (601) abuts against the top cover (401), and the hydraulic telescopic rod (601) is sleeved with a top spring (602).

3. The improved hand-held steel saw as claimed in claim 1 wherein, The fastening adjusting piece (5) comprises a fastening bolt (501), each pair of limiting stop rods (4) is vertically provided with a through groove (403) through which the fastening bolt (501) passes, and the saw blade (3) in the upper saw bow (1) is provided with a positioning hole (301) through which the fastening bolt (501) passes, and the fastening bolt (501) is threadedly connected with an adjusting nut (502) through the through groove (403) and the positioning hole (301).

4. The improved hand-held steel saw as claimed in claim 1 wherein, The top cover (401) is fixedly connected with a protection plate (404) on both sides, and a plurality of fastening pieces (405) are mounted on the top of the top cover (401), and the top cover (401) is fixed with the limiting stop rods (4) through the fastening pieces (405).

5. The improved hand-held steel saw as claimed in claim 1 wherein, The bottom of the support frame (7) is fixedly connected with a sliding block (702), the top of the upper saw bow (1) is horizontally provided with a sliding groove (105) which matches the sliding block (702), and the inner wall of the sliding groove (105) is fixedly connected with a compression spring (106) which abuts against the sliding block (702).

6. The improved hand-held steel saw as claimed in claim 1 wherein, ​ 7. The improved hand-held steel saw as claimed in claim 1 wherein, ​ 8. The improved hand-held steel saw as claimed in claim 1 wherein, The said dial frame (8) is fixedly connected with a handle (803) at one end close to the handle (102), and the said handle (803) is provided with an anti-skid net pattern.

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