Handheld steel saw

By introducing a cam-structured tensioning mechanism into the hacksaw, the problem of time-consuming and laborious adjustment by rotating the nut in the existing technology is solved, and the saw blade tension can be quickly adjusted and the operation is simple.

CN223684536UActive Publication Date: 2025-12-19SAAME TOOLS SHANGHAI IMPORT & EXPORT CO LTD
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Patent Information

Application Number
CN202423089007.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-15
Publication Date
2025-12-19
Estimated Expiration
2034-12-15

AI Technical Summary

Technical Problem

The existing tensioning mechanism of hacksaws adjusts the saw blade tension by rotating a nut, which is time-consuming and labor-intensive.

Method used

The tensioning mechanism, which adopts a cam structure, adjusts the saw blade tension by sliding contact between the operating arm and the saw frame, simplifying the process to rotating the operating arm.

Benefits of technology

It enables rapid adjustment of saw blade tension, is simple to operate, saves time and effort, and improves the efficiency of hacksaw use.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a handheld hacksaw which comprises a saw frame provided with a first supporting leg and a second supporting leg, a saw blade connected between the first supporting leg and the second supporting leg and a tensioning mechanism, a first fixing pin is arranged on the first supporting leg, a fixing hole in one end of the saw blade is connected to the first fixing pin, and a second fixing pin is arranged on the other end of the saw blade. A mounting hole is formed in the second supporting leg, and the tensioning mechanism comprises a connecting rod slidably connected to the mounting hole in the length direction of the saw blade, a second fixing pin arranged on the side, close to the first supporting leg, of the connecting rod, a shaft pin arranged on the other side of the connecting rod and an operation arm rotationally connected to the shaft pin; a fixing hole in the other end of the saw blade is connected to the second fixing pin, a cam face is arranged on the side, right opposite to the second supporting leg, of the operation arm, and the cam face is in sliding contact with the surface of the second supporting leg. According to the handheld hacksaw, the tension of the saw blade is adjusted through the cam structure, and time and labor are saved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to cutting tool field, concretely relates to a hand-held hacksaw. BACKGROUND

[0002] Hacksaws are useful tools for cutting various types of media including metal, and play an indispensable role in daily life and production and processing. A hacksaw includes a saw frame and a saw blade, and the two ends of the saw blade have mounting holes. The saw blade is installed on the saw frame in a pin hole joint mode during use.

[0003] The hacksaw usually further includes a tensioning mechanism at a position opposite to the handle on the saw frame, and the tensioning mechanism increases the tension on the saw blade by stretching the saw blade between the mounting holes. At present, the tensioning mechanism on the saw frame generally adopts a bolt structure, and the tension of the saw blade is adjusted by rotating a nut to drive a screw rod to move. However, such a mode requires multiple rotations of the nut, which is time-consuming and laborious. SUMMARY

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a hand-held hacksaw, which realizes the adjustment of the tension of the saw blade through a cam structure, thereby saving time and effort.

[0005] The utility model adopts the technical scheme that:

[0006] A hand-held hacksaw includes a saw frame having a first leg and a second leg, a saw blade connected between the first leg and the second leg, and a tensioning mechanism. The first leg is provided with a first fixed pin, and the fixed hole at one end of the saw blade is engaged with the first fixed pin. The second leg is provided with a mounting hole. The tensioning mechanism includes a connecting rod slidingly connected to the mounting hole along the length direction of the saw blade, a second fixed pin provided on the connecting rod close to the first supporting leg, a shaft pin provided on the other side of the connecting rod, and an operating arm rotatingly connected to the shaft pin. The fixed hole at the other end of the saw blade is engaged with the second fixed pin. The side of the operating arm opposite to the second leg is provided with a cam surface, and the cam surface is in sliding contact with the surface of the second leg.

[0007] As a further improvement of the above technical scheme, the rotating direction of the operating arm is the length direction of the second leg. When the operating arm rotates to contact the second leg, the farthest point of the cam surface from the shaft pin is in abutment with the surface of the second leg. When the operating arm rotates away from the second leg, the farthest point of the cam surface from the shaft pin gradually abuts against the surface of the second leg from the nearest point.

[0008] As a further improvement of the above technical solution, the connecting rod comprises a sliding part, a connecting part and a head part, the sliding part is integrally formed with the connecting part, the sliding part is in sliding connection with the mounting hole, the second fixing pin is arranged on the sliding part, the head part is detachably connected with the connecting part, and the shaft pin is arranged on the head part.

[0009] As a further improvement of the above technical solution, the connecting part is provided with external threads, the head part is provided with a threaded hole along its axis, and the connecting part is threadedly connected with the head part.

[0010] As a further improvement of the above technical solution, the sliding part is a non-circular sliding block, and the shape of the mounting hole corresponds to the shape of the sliding part.

[0011] As a further improvement of the above technical solution, the first leg is provided with a mounting block, the mounting block is provided with a first mounting surface, the sliding part is provided with a second mounting surface in the same plane as the first mounting surface, the first fixing pin and the second fixing pin are fixedly connected to the first mounting surface and the second mounting surface respectively, and the first fixing pin and the second fixing pin are oppositely inclined.

[0012] As a further improvement of the above technical solution, the mounting block is further provided with a third mounting surface, the sliding part is provided with a fourth mounting surface in the same plane as the third mounting surface, the third mounting surface and the fourth mounting surface are respectively provided with a third fixing pin and a fourth fixing pin, and the third fixing pin and the fourth fixing pin are oppositely inclined.

[0013] As a further improvement of the above technical solution, the first leg is provided with a first mounting groove and a first clamping groove in communication with the first mounting groove, the sliding part is provided with a second mounting groove and a second clamping groove in communication with the second mounting groove, the first mounting groove and the second mounting groove are in the same plane, the first clamping groove and the second clamping groove are in the same plane, the two ends of the saw blade are respectively accommodated in the first mounting groove and the second mounting groove, and the first fixing pin and the second fixing pin are respectively in sliding connection with the first clamping groove and the second clamping groove.

[0014] As a further improvement of the above technical solution, the first clamping groove and the second clamping groove are oppositely inclined.

[0015] As a further improvement of the above technical solution, the saw frame is provided with a handle, and the handle is connected to one side of the first leg or one side of the second leg.

[0016] The beneficial effects of this utility model are: after the mounting holes at both ends of the saw blade are respectively engaged with the first fixing pin and the second fixing pin, the operating arm is rotated, and the cam surface on the operating arm slides into contact with the surface of the second leg to adjust the position of the connecting rod in the mounting hole, thereby adjusting the tension of the saw blade. This utility model only requires rotating the operating arm, and the rotation angle of the operating arm is between 0-180°, which is simple to operate and saves time and effort. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the handheld hacksaw of Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the handheld hacksaw after the saw blade is removed in Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the tensioning mechanism in the handheld hacksaw of Embodiment 1 of this utility model;

[0021] Figure 4 This is an exploded view of the tensioning mechanism in the handheld hacksaw of Embodiment 1 of this utility model;

[0022] Figure 5 This is a schematic diagram of the fit relationship of the cam surface in the handheld hacksaw of Embodiment 1 of this utility model;

[0023] Figure 6 This is a schematic diagram of the state of the saw blade from relaxed to taut in the handheld hacksaw of Embodiment 1 of this utility model;

[0024] Figure 7 This is a cross-sectional view of the handheld hacksaw of Embodiment 1 of this utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the handheld hacksaw of Embodiment 2 of this utility model;

[0026] Figure 9 This is a schematic diagram of the structure of the end of the first leg in the handheld hacksaw of Embodiment 2 of this utility model;

[0027] Figure 10 This is a schematic diagram of the tensioning mechanism in the handheld hacksaw of Embodiment 2 of this utility model;

[0028] Figure 11 This is an exploded view of the tensioning mechanism in the handheld hacksaw of Embodiment 2 of this utility model;

[0029] Figure 12 This is a schematic diagram of the state of the saw blade from relaxed to taut in the handheld hacksaw of Embodiment 2 of this utility model;

[0030] Figure 13 is a sectional view of the hand-held steel saw of the embodiment 2 of the present application.

[0031] In the embodiment 1, the reference signs are as follows: 100, saw frame; 101, first supporting leg; 102, second supporting leg; 103, mounting hole; 110, handle; 120, saw blade; 121, spare saw blade; 122, fixing hole; 130, mounting block; 141, first fixing pin; 142, second fixing pin; 143, third fixing pin; 144, fourth fixing pin; 150, connecting rod; 151, sliding part; 152, connecting part; 153, head part; 154, shaft pin; 155, gasket; 160, operating arm; 161, cam surface; 162, shaft hole; 171, first mounting surface; 172, second mounting surface; 173, third mounting surface; 174, fourth mounting surface.

[0032] In the embodiment 2, the reference signs are as follows: 200, saw frame; 201, first supporting leg; 202, second supporting leg; 203, mounting hole; 210, handle; 220, saw blade; 230, connecting rod; 231, sliding part; 232, connecting part; 233, head part; 234, shaft pin; 240, operating arm; 241, cam surface; 242, shaft hole; 251, first fixing pin; 252, second fixing pin; 261, first clamping groove; 262, second clamping groove; 271, first mounting groove; 272, second mounting groove. DETAILED DESCRIPTION

[0033] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. In addition, all the coupling / connection relations involved in the patent do not mean that the components are directly connected, but means that a better coupling structure can be composed by adding or reducing coupling auxiliary components according to the specific implementation situation, such as fixed connection / fixed installation which can be selected according to the needs, such as screw connection, bolt connection, pin connection, key connection, adhesion, mortise and tenon connection, welding, riveting and the like, such as detachable connection which can be selected according to the needs, such as screw connection, bolt connection, threaded connection, buckle connection, mortise and tenon connection, magic tape connection and the like. The various technical features in the present application can be combined interactively without mutual contradiction and conflict.

[0034] REFERENCE Figures 1-7The utility model discloses a hand held steel saw, including saw frame 100, saw blade 120, handle 110 and tensioning mechanism, the saw frame 100 has first support leg 101 and second support leg 102, handle 110 is connected in first support leg 101 one side, first fixed pin 141 is provided on first support leg 101, the fixed hole 122 of one end of saw blade 120 is jointed on first fixed pin 141, the mounting hole 103 is provided on second support leg 102, the connecting rod 150 of sliding connection in the length direction of saw blade 120 is included in the mounting hole 103, the second fixed pin 142 of setting in the connecting rod 150 on the first support leg side close, the shaft pin 154 of setting in the other side of connecting rod 150 and the operating arm 160 of rotation connection in the shaft pin 154, the fixed hole 122 of the other end of saw blade 120 is jointed on second fixed pin 142, the cam surface 161 of operating arm 160 is opposite one side and is provided with second support leg 102, the cam surface 161 and the surface of second support leg 102 sliding contact.

[0035] It can be understood that when the staff actuates the operating arm 160, the distance between the shaft pin 154 and the second support leg 102 changes with the eccentric path of the cam surface 161, thereby driving the connecting rod 150 to move axially in the mounting hole 103, and further adjusting the tension of the saw blade 120.

[0036] Further, with reference to Figure 6 , the rotating direction of the operating arm 160 is the length direction of the second support leg 102, that is, the operating arm 160 rotates towards or away from the second support leg 102. When the operating arm 160 rotates to contact the second support leg 102, the operating arm 160 is accommodated, and at this time, the farthest point of the cam surface 161 from the shaft pin 154 abuts against the surface of the second support leg 102. The specific distance from the axis of the shaft pin 154 to the surface of the second support leg 102 is H1, and at this time, the saw blade 120 is in the maximum tension state that can be adjusted by the hand-held steel saw. When the operating arm 160 rotates away from the second support leg 102, the farthest point of the cam surface 161 from the shaft pin 154 gradually abuts against the surface of the second support leg 102 from the nearest point, and the tension of the saw blade 120 gradually decreases. When the nearest point of the cam surface 161 from the shaft pin 154 abuts against the surface of the second support leg 102, the specific distance from the axis of the shaft pin 154 to the surface of the second support leg 102 is H2 (H2 is less than H1), and at this time, the saw blade 120 is in the minimum tension state that can be adjusted by the hand-held steel saw, that is, the saw blade 120 can be removed from the saw frame 100.

[0037] In the embodiment, with reference to Figure 3 andFigure 4 The connecting rod 150 comprises a sliding part 151, a connecting part 152 and a head part 153. The sliding part 151 is integrally formed with the connecting part 152. The sliding part 151 is in sliding connection with the mounting hole 103. The sliding part 151 is a non-circular sliding block (the cross section of the sliding part 151 is in the shape of a racetrack). The shape of the mounting hole 103 corresponds to the shape of the sliding part 151, so that the sliding part 151 can only move axially along the mounting hole 103. The second fixing pin 142 is arranged on the sliding part 151. The head part 153 is provided with two shaft pins 154 on both sides. The operating arm 160 is provided with two shaft holes 162, which are respectively sleeved on the two shaft pins 154, so as to realize the rotation of the operating arm 160 relative to the head part 153. The head part 153 is detachably connected with the connecting part 152. Specifically, the connecting part 152 is provided with external threads. The head part 153 is provided with a threaded hole along its axis. The connecting part 152 is screw-connected to the head part 153, so as to facilitate the dismounting and mounting of the tensioning mechanism.

[0038] Further, referring to Figure 4 and Figure 5 , a gasket 155 is arranged between the head part 153 and the sliding part 151. The gasket 155 abuts against the surface of the second leg 102. The cam surface 161 is in sliding contact with the surface of the gasket 155. In this way, the surface of the second leg 102 can be protected, and the accuracy of the tensioning mechanism during long-term use can be ensured.

[0039] In some embodiments, referring to Figure 2 , the first leg 101 is provided with a mounting block 130. The mounting block 130 is provided with a first mounting surface 171. The sliding part 151 is provided with a second mounting surface 172, which is in the same plane as the first mounting surface 171. The first fixing pin 141 and the second fixing pin 142 are respectively fixedly connected to the first mounting surface 171 and the second mounting surface 172. After the fixing holes 122 at both ends of the saw blade 120 are engaged on the first fixing pin 141 and the second fixing pin 142, the side surface of the saw blade 120 is in contact with the first mounting surface 171 and the second mounting surface 172, so as to ensure the parallelism of the saw blade 120 and prevent the saw blade 120 from being twisted and damaged.

[0040] Further, referring to Figure 7 , the first fixing pin 141 and the second fixing pin 142 are arranged in a back-to-back and inclined manner. In this way, the saw blade 120 can be prevented from sliding off the first fixing pin 141 and the second fixing pin 142, and the stability of the steel saw can be improved.

[0041] In a preferred embodiment, referring to Figure 2The mounting block 130 is further provided with a third mounting surface 173, and the sliding part 151 is provided with a fourth mounting surface 174 in the same plane as the third mounting surface 173. The third mounting surface 173 and the fourth mounting surface 174 are respectively provided with a third fixing pin 143 and a fourth fixing pin 144. The third fixing pin 143 and the fourth fixing pin 144 can engage the spare saw blade 121, so as to change the cutting direction of the steel saw. In different cutting environments, the saw blade 120 can be installed on the first fixing pin 141 and the second fixing pin 142, or installed on the third fixing pin 143 and the fourth fixing pin 144.

[0042] Further, the third fixing pin 143 and the fourth fixing pin 144 are oppositely and obliquely arranged, so as to avoid the saw blade 120 from sliding off the third fixing pin 143 and the fourth fixing pin 144, and improve the stability of the steel saw.

[0043] With reference to Figures 8-13 The utility model discloses a handheld steel saw, which comprises a saw frame 200, a saw blade 220, a handle 210 and a tensioning mechanism. The saw frame 200 has a first supporting leg 201 and a second supporting leg 202. The handle 210 is connected to one side of the second supporting leg 202. The first supporting leg 201 is provided with a first fixing pin 251. The fixed hole at one end of the saw blade 220 is engaged with the first fixing pin 251. The second supporting leg 202 is provided with a mounting hole 203. The tensioning mechanism comprises a connecting rod 230, a second fixing pin 252, a shaft pin 234 and an operating arm 240. The connecting rod 230 is slidably connected to the mounting hole 203 along the length direction of the saw blade 220. The second fixing pin 252 is arranged on the connecting rod 230 close to the first supporting leg. The shaft pin 234 is arranged on the other side of the connecting rod 230. The operating arm 240 is rotationally connected to the shaft pin 234. The fixed hole at the other end of the saw blade 220 is engaged with the second fixing pin 252. The side of the operating arm 240 opposite to the second supporting leg 202 is provided with a cam surface 241. The cam surface 241 is in sliding contact with the surface of the second supporting leg 202.

[0044] It can be understood that when the operating arm 240 is actuated by the worker, the distance between the shaft pin 234 and the second supporting leg 202 changes with the eccentric path of the cam surface 241 during the sliding contact between the cam surface 241 and the surface of the second supporting leg 202, so as to drive the axial movement of the connecting rod 230 in the mounting hole 203, and further adjust the tension of the saw blade 220.

[0045] Further, with reference to Figure 12, the rotation direction of the operation arm 240 is the length direction of the second leg 202, that is, the operation arm 240 rotates towards or away from the second leg 202, when the operation arm 240 rotates to contact the second leg 202, the storage of the operation arm 240 is realized, and at this time, the farthest point of the cam surface 241 from the shaft pin 234 abuts against the surface of the second leg 202, the axis of the shaft pin 234 to the surface of the second leg 202 is H4, at this time, the saw blade 220 is in the maximum tension state that can be adjusted by the hand-held steel saw. When the operation arm 240 rotates away from the second leg 202, the farthest point of the cam surface 241 from the shaft pin 234 gradually abuts against the surface of the second leg 202 to the nearest point, the tension of the saw blade 220 gradually decreases, when the nearest point of the cam surface 241 from the shaft pin 234 abuts against the surface of the second leg 202, the axis of the shaft pin 234 to the surface of the second leg 202 is H3 (H3 is less than H4), at this time, the saw blade 220 is in the minimum tension state that can be adjusted by the hand-held steel saw, that is, the saw blade 220 can be removed from the saw frame 200.

[0046] In the embodiment, referring to Figure 10 and Figure 11 , the connecting rod 230 comprises a sliding part 231, a connecting part 232 and a head part 233, the sliding part 231 is integrally formed with the connecting part 232, the sliding part 231 is in sliding connection with the mounting hole 203, the sliding part 231 is a non-circular slide block (the cross section of the sliding part 231 is quadrangular), the shape of the mounting hole 203 corresponds to the shape of the sliding part 231, so that the sliding part 231 can only move axially along the mounting hole 203. The second fixing pin 252 is arranged on the sliding part 231, two shaft pins 234 are arranged on the two sides of the head part 233, two shaft holes 242 are arranged on the operation arm 240, the two shaft holes 242 are respectively sleeved on the two shaft pins 234, so as to realize the rotation of the operation arm 240 relative to the head part 233. The head part 233 is detachably connected with the connecting part 232, specifically, the connecting part 232 is provided with external threads, the head part 233 is provided with a threaded hole along the axis of the head part 233, and the connecting part 232 is screw-connected to the head part 233, so as to facilitate the dismounting and mounting of the tensioning mechanism.

[0047] In the embodiment, referring to Figure 9 , Figure 10 and Figure 11The first leg 201 is provided with a first mounting slot 271 and a first clamping slot 261 communicated with the first mounting slot 271, the sliding part 231 is provided with a second mounting slot 272 and a second clamping slot 262 communicated with the second mounting slot 272, the first mounting slot 271 and the second mounting slot 272 are in the same plane, the first clamping slot 261 and the second clamping slot 262 are in the same plane, both ends of the saw blade 220 are respectively accommodated in the first mounting slot 271 and the second mounting slot 272, and the first fixing pin 251 and the second fixing pin 252 are respectively slidably connected to the first clamping slot 261 and the second clamping slot 262.

[0048] It can be understood that, during installation of the saw blade 220, the first fixing pin 251 and the second fixing pin 252 are first inserted into the fixing holes at both ends of the saw blade 220, and then are respectively placed into the first clamping slot 261 and the second clamping slot 262, and meanwhile the saw blade 220 enters the second mounting slot 272 and the second mounting slot 272, the second mounting slot 272 and the second mounting slot 272 limit both sides of the saw blade 220, and the second mounting slot 272 and the second mounting slot 272 are in the same plane, so that parallelism of the saw blade 220 is ensured, and the saw blade 220 is prevented from being twisted and damaged.

[0049] Further, referring to Figure 13 The first clamping slot 261 and the second clamping slot 262 are oppositely and obliquely arranged, so that the first fixing pin 251 is prevented from sliding out of the opening of the first clamping slot 261, and the second fixing pin 252 is prevented from sliding out of the opening of the second clamping slot 262, thereby improving stability of the steel saw.

[0050] The above is a specific description of the preferred embodiment of the utility model, but the utility model is not limited to the embodiment, and various equivalent modifications or replacements can be made by those skilled in the art without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the present application.

Claims

1. A hand-held hacksaw comprising a frame having a first leg and a second leg, a blade connected between the first leg and the second leg, and a tensioning mechanism, characterised in that: The first leg is provided with a first fixing pin, and a fixing hole at one end of the saw blade is engaged with the first fixing pin.

2. A hand-held hacksaw according to claim 1, characterised in that: The operation arm is provided with a cam surface on a side opposite to the second leg.

3. A hand-held hacksaw according to claim 2, wherein: The connecting rod comprises a sliding part, a connecting part and a head part.

4. A hand-held hacksaw according to claim 3, wherein: The connecting part is provided with external threads, and the head part is provided with a threaded hole along an axis thereof.

5. A hand-held hacksaw according to claim 4, wherein: The sliding part is a non-circular sliding block, and the shape of the mounting hole corresponds to the shape of the sliding part.

6. A hand-held hacksaw according to claim 5, wherein: The first leg is provided with a mounting block, and the mounting block is provided with a first mounting surface.

7. A hand-held hacksaw according to claim 6, characterised in that: The mounting block is further provided with a third mounting surface, and the sliding part is provided with a fourth mounting surface in the same plane as the third mounting surface.

8. A hand-held hacksaw according to claim 5, wherein: The first leg is provided with a first mounting groove and a first clamping groove in communication with the first mounting groove.

9. A hand-held hacksaw according to claim 8, characterised in that: The first clamping groove and the second clamping groove are oppositely inclined.

10. A hand saw according to any one of claims 1-9, characterized in that: The saw frame is provided with a handle connected to one side of the first leg or one side of the second leg.