Clamping back saw

Abstract

The utility model provides a back clamping saw which comprises a saw blade and a handle, the saw blade is connected with the handle, the saw blade comprises a saw blade body and a back clamping bag edge, the back clamping bag edge is fixed on one side of the saw blade body, the back clamping bag edge is a bending forming piece and wraps the saw blade body, and the two sides of the saw blade body are tightly attached to the inner walls of the two sides of the back clamping bag edge. According to the utility model, a method of synchronously bending and forming the knapsack clamping edges and installing the knapsack clamping edges is adopted, namely, the knapsack clamping edges are wrapped and connected on the saw blade body while being bent and formed. Therefore, compared with the prior art, the manufacturing and mounting process of the knapsack clamping edge can be simplified, the processing period is shortened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to a manual tool, more specifically, to a back-claw saw. Background Art

[0002] Thin-sheet tools such as blades and saw blades will bend when they are subjected to force. By installing a hard metal clip back on the blade or saw blade, the bending strength of the tool can be improved, thereby solving the problem of tool bending. Most of the current clip back saws use iron clip back edges, but the iron clip back edges are difficult to bend. The ordinary materials used to process the iron clip back edges have limited toughness and are very easy to break after bending 180°, making it difficult to apply to convenient and economical clip back edge cold bending processing. For this reason, the clip back edges on the existing clip back saws are usually made first and then assembled and installed with the tool, resulting in a complex clip back edge processing process and high cost. The utility model patent with publication number CN211615680U discloses a scabbard, a tool holder assembly and a utility knife, including a bottom plate and a bent edge on both sides of the bottom plate, and the bottom plate and the bent edges on both sides form a blade cavity for accommodating the blade. However, the bent edge in the utility model is not improved compared to the prior art. Utility Model Content

[0003] The existing clamping back saw has a complex processing technology for clamping the bag edge and a high cost. In order to overcome this defect, the utility model provides a clamping back saw, which can facilitate the processing of the clamping bag edge and reduce the cost.

[0004] The technical solution of the utility model is: a back-clamp saw, including a saw blade and a handle, the saw blade is connected to the handle, the saw blade includes a saw blade body and a back-clamp edge, the back-clamp edge is fixed to one side of the saw blade body, the back-clamp edge is a bent and formed part and is coated on the saw blade body, and the two sides of the saw blade body are pressed and fitted with the inner walls of the back-clamp edge on both sides. The utility model adopts a method of simultaneously bending and forming the back-clamp edge and installing the back-clamp edge, that is, while the back-clamp edge is being bent and formed, it also completes the coating and connection on the saw blade body. Therefore, compared with the prior art, the utility model can simplify the manufacturing and installation process of the back-clamp edge, shorten the processing cycle, and reduce the manufacturing cost.

[0005] Preferably, the handle is provided with a saw blade slot and a fastener, the rear end of the saw blade is tightly inserted into the saw blade slot, and the fastener passes through the overlapping portion of the handle and the saw blade. The saw blade is inserted into the saw blade slot, the saw blade is initially supported, and then the fastener is used to connect the handle and the saw blade, so that the saw blade and the handle can be fixedly installed.

[0006] Preferably, the saw blade slot includes a main body slot section and a clamp back slot section that are connected, and a step structure is provided between the main body slot section and the clamp back slot section. After the saw blade body and the clamp back edge are combined, there is a difference in thickness between the upper and lower parts of the saw blade. The saw blade slot formed by the main body slot section and the clamp back slot section can adapt to the thickness difference of different parts of the saw blade and form a good match with the saw blade.

[0007] Preferably, the fastener comprises a rivet and a matching rivet cap. The fastener formed by the rivet and the rivet cap has a higher connection reliability.

[0008] Preferably, the handle comprises a connecting arm and a grip forming an angle, the connecting arm is connected to the saw blade, and the grip is flush with the saw blade. The grip and the saw blade are arranged at a specific angle and position relationship, so that the wrist can maintain a more comfortable posture during use and it is also convenient to apply force.

[0009] Preferably, a pressing reinforcement groove is provided near the bending portion of the bag edge. After the bag edge is bent and formed, the pressing reinforcement groove is formed by pressurizing, and the portion of the U-shaped opening of the bag edge corresponding to the pressing reinforcement groove is deformed to add force to the bending portion of the bag edge, thereby enhancing the bonding force between the bag edge and the saw blade body.

[0010] Preferably, the thickness of the plate on the side of the bag is 1.2 to 2.0 mm.

[0011] As a preferred embodiment, the clamp bag edge is made of aluminum alloy. Aluminum alloy clamp bag edges are lighter than iron clamp bag edges, more comfortable to use for a long time, and the processing of aluminum alloy clamp bag edges is simpler and more convenient than iron clamp bag edges, which can save the processes of polishing, rust prevention, surface painting and electroplating, etc. It has a high-end appearance, light weight, convenient production and high cost performance.

[0012] Preferably, the handle comprises two injection-molded handle half shells, which are assembled into one piece and fixed by bolts. Assembling the handle with injection-molded handle half shells can not only facilitate processing into more shapes, but also reduce the weight of the handle, making it easier to use the back saw.

[0013] Preferably, a positioning hole is provided on the edge of the bag clip, and a latch that matches the positioning hole is provided on the handle half shell. After the handle half shell is assembled into the handle, the latch matches the positioning hole so that the handle buckles the edge of the bag clip, further improving the fixing effect of the edge of the bag clip and the handle.

[0014] The beneficial effects of the utility model are:

[0015] Convenient for processing the bag edge and reducing costs. The bag edge of the utility model is bent and formed, and at the same time, the bag edge of the utility model also completes the covering and connection on the saw blade body, which can simplify the production and installation process of the bag edge, shorten the processing cycle, and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of the utility model;

[0017] Figure 2 A top view of the utility model;

[0018] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0019] Figure 4 This is a schematic diagram of a split structure of the saw blade in the utility model;

[0020] Figure 5 A structural schematic diagram of a handle in the utility model;

[0021] Figure 6 It is a partial structural schematic diagram of the edge of the backpack in the utility model;

[0022] Figure 7 This is a schematic diagram of a split structure of the utility model;

[0023] Figure 8 It is a schematic diagram of a state when the edge of the middle clamp backpack is bent and installed in the utility model.

[0024] In the figure, 1-saw blade, 101-saw blade body, 102-back clamp edge, 1021-pressed reinforcement groove, 1022-positioning hole, 2-handle, 201-saw blade slot, 2011-body slot section, 2012-back clamp slot section, 202-fastener, 203-handle half shell, 2031-latch, 204-connecting arm, 205-handle, 3-positioning mold, 4-sliding mold, 401-pressing head, 402-anvil. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the specific embodiments of the drawings.

[0026] Embodiment 1:

[0027] like Figures 1 to 5 , Figure 7 , Figure 8As shown, a back-claw saw comprises a saw blade 1 and a handle 2, wherein the handle 2 is connected to the saw blade 1. The saw blade 1 comprises a saw blade body 101 and a back-claw edge 102, wherein the saw blade body 101 is provided with saw teeth on the lower side, and the back-claw edge 102 is fixed on the upper side of the saw blade body 101. The cross section of the back-claw edge 102 is U-shaped, and the back-claw edge 102 is a bent and formed part, which is formed by folding a 1.6 mm thick 6063 aluminum alloy plate in half. The back-claw edge 102 is bent and formed while being clamped and covered on the saw blade body 101, so that the two sides of the saw blade body 101 and the inner walls of the two sides of the back-claw edge 102 fit tightly under pressure. The handle 2 is composed of two sections, a connecting arm 204 and a grip 205, wherein the connecting arm 204 and the grip 205 are connected in a "7" shape, wherein the connecting arm 204 is used to connect to the saw blade 1, and the grip 205 has a curved surface suitable for palm gripping, and is used for gripping by the user. The connecting arm 204 forms an angle of 120° with the saw blade 1, and the handle 205 forms an angle of 60° with the rear edge of the saw blade 1. The handle 205 is flush with the saw blade 1, so that the wrist can maintain a more comfortable posture when in use, and it is also convenient to apply force. The handle 2 is a split structure, consisting of two handle half shells 203. The two handle half shells 203 are injection molded, and the two handle half shells 203 are assembled and then fixed with bolts. A notch is provided on the joint surface of the two handle half shells 203, and the notch forms a notch when the two handle half shells 203 are assembled. The handle 2 is provided with a saw blade slot 201 and a fastener 202. The saw blade slot 201 is formed by the notch. The rear end of the saw blade 1 is inserted into the saw blade slot 201, and the saw blade 1 and the saw blade slot 201 are tightly matched, with a slight interference fit. The saw blade slot 201 has two slot sections, namely the body slot section 2011 and the clip back slot section 2012. The two slot sections are connected, and the width of the body slot section 2011 is smaller than the width of the clip back slot section 2012, so a step structure is formed between the body slot section 2011 and the clip back slot section 2012. The saw blade body 101 and the handle 2 are each provided with two fixing holes, and the fixing holes on the saw blade body 101 correspond to the fixing holes on the handle 2. The fastener 202 includes a rivet and a matching rivet cap. After the saw blade body 101 and the fixing holes of the handle 2 are aligned, the rivet vertically penetrates the overlapping part of the handle 2 and the saw blade 1, passes through the fixing hole, and then squeezes and rivets with the rivet cap to fix the handle 2 and the saw blade 1 together. The clip back edge 102 is provided with a positioning hole 1022, and the handle half shell 203 is provided with a latch 2031 corresponding to the positioning hole 1022. The handle 2 is provided with a rubber sleeve made of silicone and is coated on the handle 2 through a rubber-encapsulating injection molding process to protect the handle 2 and improve the overall corrosion resistance of the handle 2 and the softness when held in the hand.

[0028] In the utility model, the bending and forming of the clamping bag edge 102 and the installation of the clamping bag edge 102 are carried out simultaneously, and are implemented by a press machine. The press machine has a positioning mold 3 for positioning the saw blade body 101, and a sliding die 4 that can approach and move away from the positioning mold 3. The sliding die 4 includes a pressing head 401 and an anvil 402. The anvil 402 is used to place the aluminum alloy pre-pressed part for making the clamping bag edge 102, and can position the two ends of the aluminum alloy pre-pressed part. The pressing head 401 can be driven up and down by an oil cylinder, and the top support surface of the anvil 402 is slightly lower than the top support surface of the positioning mold 3. When the clamping bag edge 102 is made and installed, the saw blade body 101 to be equipped with the clamping bag edge 102 and the fixed hole processing is completed is placed on the positioning mold of the press machine, and the two ends and the lower side of the saw blade body 101, that is, the sawtooth side, are against the three edges of the positioning mold, and the upper side of the saw blade body 101, that is, the non-sawtooth side, is suspended and extended. The aluminum alloy plate for making the clamping bag edge 102 is first stretched and pre-bent into a V-shape, and the fixing hole is processed to generate a V-shaped aluminum alloy pre-pressed part. Then, the V-shaped mouth of the aluminum alloy pre-pressed part is placed flat on the anvil 402 toward the positioning mold 3. Through precise structural design, it can be ensured that the inner side of the V-shaped mouth of the aluminum alloy pre-pressed part on the anvil 402 is about 0.5mm lower than the lower surface of the suspended protruding part of the saw blade body 101. The sliding die 4 moves the aluminum alloy pre-pressed part toward the positioning mold 3 until the upper side of the saw blade body 101 enters the V-shaped mouth of the aluminum alloy pre-pressed part and approaches the closed end of the V-shaped mouth of the aluminum alloy pre-pressed part. The pressure head 401 descends to press the aluminum alloy pre-pressed part, close the V-shaped mouth, and complete the folding of the aluminum alloy plate. In this way, the clamping bag edge 102 is bent and formed, and the coating and connection on the saw blade body 101 are also completed. After that, the saw blade 1 and the handle 2 are assembled to finally obtain the finished clamping saw.

[0029] Embodiment 2:

[0030] A back-clamp saw includes a saw blade 1 and a handle 2, wherein the handle 2 is connected to the saw blade 1. The saw blade 1 includes a saw blade body 101 and a clamping edge 102, wherein saw teeth are provided on the lower side of the saw blade body 101, and the clamping edge 102 is fixed on the upper side of the saw blade body 101. The cross-section of the clamping edge 102 is U-shaped, and the clamping edge 102 is a bent and formed part, which is formed by folding a 2.0 mm thick 6063 aluminum alloy plate in half. The clamping edge 102 is bent and formed while being clamped and covered on the saw blade body 101, so that the two sides of the saw blade body 101 and the inner walls of the two sides of the clamping edge 102 fit tightly under pressure. Different from Example 1, a pressed reinforcement groove 1021 is provided on the clamping edge 102, such as Figure 6As shown, the pressed reinforcement groove 1021 is close to the bending part of the bag edge 102, that is, the pressed reinforcement groove 1021 is closer to the U-shaped closed end of the bag edge 102, and farther from the U-shaped closed end of the bag edge 102. The handle 2 is composed of two sections, the connecting arm 204 and the handle 205. The connecting arm 204 and the handle 205 are connected to form a "7" shape. The connecting arm 204 is used to connect with the saw blade 1, and the handle 205 has a curved surface suitable for palm grip, which is used for the user to grip and is also convenient for adding force. The connecting arm 204 forms an angle of 150° with the saw blade 1, and the handle 205 forms an angle of 60° with the rear edge of the saw blade 1. The handle 205 is flush with the saw blade 1, so that the wrist can maintain a more comfortable posture when in use. The handle 2 is a split structure, consisting of two handle half shells 203, the two handle half shells 203 are injection molded, and the two handle half shells 203 are assembled and then fixed with bolts. The joint surfaces of the two handle half shells 203 are each provided with a notch, and when the two handle half shells 203 are assembled, the notch forms a notch. The handle 2 is provided with a saw blade slot 201 and a fastener 202, and the saw blade slot 201 is formed by the notch. The rear end of the saw blade 1 is inserted into the saw blade slot 201, and the saw blade 1 and the saw blade slot 201 are tightly matched, with a slight interference fit. The saw blade slot 201 has two slot sections, namely, a main body slot section 2011 and a clip back slot section 2012, and the two slot sections are connected, and the width of the main body slot section 2011 is smaller than the width of the clip back slot section 2012, so a step structure is formed between the main body slot section 2011 and the clip back slot section 2012. The saw blade body 101 and the handle 2 are each provided with two fixing holes. The fixing holes on the saw blade body 101 correspond to the fixing holes on the handle 2. The fastener 202 includes a rivet and a matching rivet cap. After the saw blade body 101 and the fixing holes of the handle 2 are aligned, the rivet vertically penetrates the overlapping part of the handle 2 and the saw blade 1, passes through the fixing holes and is squeezed and riveted with the rivet cap to fix the handle 2 and the saw blade 1 together. A positioning hole 1022 is provided on the clamping bag edge 102, and a latch 2031 corresponding to the positioning hole 1022 is provided on the handle half shell 203. The handle 2 is provided with a rubber sleeve, which is made of silicone and is coated on the handle 2 through a rubber injection molding process to protect the handle 2 and improve the overall corrosion resistance of the handle 2 and the softness when held in the hand. The rest is the same as in Example 1.

[0031] In the utility model, the bending and forming of the clamping bag edge 102 and the installation of the clamping bag edge 102 are carried out simultaneously, and are implemented by a press machine. The press machine has a positioning mold 3 for positioning the saw blade body 101, and a sliding die 4 that can approach and move away from the positioning mold 3. The sliding die 4 includes a pressing head 401 and an anvil 402. The anvil 402 is used to place the aluminum alloy pre-pressed part for making the clamping bag edge 102, and can position the two ends of the aluminum alloy pre-pressed part. The pressing head 401 and the anvil 402 can both be driven up and down by a cylinder. When the clamping bag edge 102 is made and installed, the saw blade body 101 to which the clamping bag edge 102 is to be added and the fixing hole processing has been completed is placed on the positioning mold of the press machine, and the two ends and the lower side of the saw blade body 101, that is, the sawtooth side, are against the three edges of the positioning mold, and the upper side of the saw blade body 101, that is, the non-sawtooth side, is suspended and extended. The aluminum alloy plate for making the clamping bag edge 102 is first stretched and pre-bent into a V-shape, and the fixing hole is processed to generate a V-shaped aluminum alloy pre-pressed part. Then, the V-shaped mouth of the aluminum alloy pre-pressed part is placed flat on the anvil 402 toward the positioning mold 3, and the sliding die 4 moves the aluminum alloy pre-pressed part toward the positioning mold 3 until the upper side of the saw blade body 101 enters the V-shaped mouth of the aluminum alloy pre-pressed part. The pressure head 401 and the anvil 402 are simultaneously started and moved together to press the aluminum alloy pre-pressed part together, and the V-shaped mouth is closed. The aluminum alloy plate is folded and assembled, so that the clamping bag edge 102 is bent and formed, and the coating and connection on the saw blade body 101 are also completed. After that, a second press is performed to generate the pressed reinforcement groove 1021, and the saw blade 1 and the handle 2 are assembled, and finally the clamping back saw product is obtained.

[0032] Embodiment 3:

[0033] A back-clamp saw includes a saw blade 1 and a handle 2, wherein the handle 2 is connected to the saw blade 1. The saw blade 1 includes a saw blade body 101 and a back-clamp edge 102, wherein saw teeth are provided on the lower side of the saw blade body 101, and the back-clamp edge 102 is fixed on the upper side of the saw blade body 101. The cross-section of the back-clamp edge 102 is U-shaped, and the back-clamp edge 102 is a bent and formed part, which is formed by folding a 1.2 mm thick 6063 aluminum alloy plate in half. The back-clamp edge 102 is bent and formed while being clamped and covered on the saw blade body 101, so that the two sides of the saw blade body 101 and the inner walls of the two sides of the back-clamp edge 102 fit tightly under pressure. The back-clamp edge 102 is provided with a pressed reinforcement groove 1021, such as Figure 6As shown, the pressed reinforcement groove 1021 is close to the bending part of the bag edge 102, that is, the pressed reinforcement groove 1021 is closer to the U-shaped closed end of the bag edge 102, and farther from the U-shaped closed end of the bag edge 102. The handle 2 is composed of two sections, the connecting arm 204 and the handle 205. The connecting arm 204 and the handle 205 are connected to form a "7" shape. The connecting arm 204 is used to connect with the saw blade 1, and the handle 205 has a curved surface suitable for palm grip, which is used for the user to grip and is also convenient for adding force. The connecting arm 204 forms an angle of 135° with the saw blade 1, and the handle 205 forms an angle of 60° with the rear edge of the saw blade 1. The handle 205 is flush with the saw blade 1, so that the wrist can maintain a more comfortable posture when in use. The handle 2 is a split structure, consisting of two handle half shells 203, the two handle half shells 203 are injection molded, and the two handle half shells 203 are assembled and then fixed with bolts. The joint surfaces of the two handle half shells 203 are each provided with a notch, and when the two handle half shells 203 are assembled, the notch forms a notch. The handle 2 is provided with a saw blade slot 201 and a fastener 202, and the saw blade slot 201 is formed by the notch. The rear end of the saw blade 1 is inserted into the saw blade slot 201, and the saw blade 1 and the saw blade slot 201 are tightly matched, with a slight interference fit. The saw blade slot 201 has two slot sections, namely, a body slot section 2011 and a back clip slot section 2012, and the two slot sections are connected. The width of the body slot section 2011 is smaller than the width of the back clip slot section 2012, so a step structure is formed between the body slot section 2011 and the back clip slot section 2012. The saw blade body 101 and the handle 2 are each provided with two fixing holes, and the fixing holes on the saw blade body 101 correspond to the positions of the fixing holes on the handle 2. Different from the comparative document 1, the fastener 202 includes a bolt and a matching nut. After the saw blade body 101 is aligned with the fixing hole of the handle 2, the bolt vertically penetrates the overlapping part of the handle 2 and the saw blade 1, passes through the fixing hole and is screwed with the nut through a thread to fix the handle 2 and the saw blade 1 together. A positioning hole 1022 is provided on the clamping bag edge 102, and a latch 2031 corresponding to the positioning hole 1022 is provided on the handle half shell 203. The handle 2 is provided with a rubber sleeve, which is made of silicone and is coated on the handle 2 through a rubber injection molding process to protect the handle 2 and improve the overall corrosion resistance of the handle 2 and the softness when held in the hand. The rest is the same as in Example 1.

[0034] In the utility model, the bending and forming of the clamping bag edge 102 and the installation of the clamping bag edge 102 are carried out simultaneously, and are implemented by a press machine. The press machine has a positioning mold 3 for positioning the saw blade body 101, and a sliding die 4 that can approach and move away from the positioning mold 3. The sliding die 4 includes a pressing head 401 and an anvil 402. The anvil 402 is used to place the aluminum alloy pre-pressed part for making the clamping bag edge 102, and can position the two ends of the aluminum alloy pre-pressed part. The pressing head 401 and the anvil 402 can both be driven up and down by a cylinder. When the clamping bag edge 102 is made and installed, the saw blade body 101 to which the clamping bag edge 102 is to be added and the fixing hole processing has been completed is placed on the positioning mold of the press machine, and the two ends and the lower side of the saw blade body 101, that is, the sawtooth side, are against the three edges of the positioning mold, and the upper side of the saw blade body 101, that is, the non-sawtooth side, is suspended and extended. The aluminum alloy plate for making the clamping bag edge 102 is first stretched and pre-bent into a V-shape, and the fixing hole is processed to generate a V-shaped aluminum alloy pre-pressed part. Then, the V-shaped mouth of the aluminum alloy pre-pressed part is placed flat on the anvil 402 toward the positioning mold 3, and the sliding die 4 moves the aluminum alloy pre-pressed part toward the positioning mold 3 until the upper side of the saw blade body 101 enters the V-shaped mouth of the aluminum alloy pre-pressed part. The pressure head 401 and the anvil 402 are simultaneously started and moved together to press the aluminum alloy pre-pressed part together, and the V-shaped mouth is closed. The aluminum alloy plate is folded and assembled, so that the clamping bag edge 102 is bent and formed, and the coating and connection on the saw blade body 101 are also completed. After that, a second press is performed to generate the pressed reinforcement groove 1021, and the saw blade 1 and the handle 2 are assembled, and finally the clamping back saw product is obtained.

Claims

1. A back-claw saw, comprising a saw blade (1) and a handle (2), wherein the saw blade (1) is connected to the handle (2), the saw blade (1) comprising a saw blade body (101) and a back-claw edge (102), the back-claw edge (102) being fixed to one side of the saw blade body (101), wherein: The bag edge (102) is a bent and formed part and covers the saw blade body (101), and the two sides of the saw blade body (101) are pressed tightly against the inner walls of the bag edge (102).

2. The back saw according to claim 1, characterized in that: The handle (2) is provided with a saw blade slot (201) and a fastener (202); the rear end of the saw blade (1) is tightly inserted into the saw blade slot (201); and the fastener (202) vertically penetrates the overlapping portion of the handle (2) and the saw blade (1).

3. The back saw according to claim 2, characterized in that: The saw blade slot (201) comprises a main body slot section (2011) and a back-clamping slot section (2012) which are connected, and a step structure is provided between the main body slot section (2011) and the back-clamping slot section (2012).

4. The back saw according to claim 2, characterized in that: The fastener (202) includes a rivet and a matching rivet cap.

5. The back saw according to claim 2, characterized in that: A pressing reinforcement groove (1021) is provided on the edge (102) of the bag clamp, near the bent portion thereof.

6. The back saw according to claim 1, characterized in that: The handle (2) comprises a connecting arm (204) and a grip (205) forming an angle, the connecting arm (204) being connected to the saw blade (1), and the grip (205) being flush with the saw blade (1).

7. The back saw according to claim 1, characterized in that: The thickness of the bag edge (102) is 1.2-2.0 mm.

8. The back saw according to claim 1, characterized in that: The clamp bag edge (102) is an aluminum alloy part.

9. The back saw according to any one of claims 1 to 8, characterized in that: The handle (2) comprises two injection-molded handle half shells (203), and the two handle half shells (203) are assembled into one and fixed by bolts.

10. The back saw according to claim 9, characterized in that: A positioning hole (1022) is provided on the bag edge (102) and a latch (2031) corresponding to the positioning hole (1022) is provided on the handle half shell (203).

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