Saw with handle tensioning mechanism

Abstract

A hacksaw can include a blade support frame, a handle operably coupled to the blade support frame at a first end of the blade support frame, a moveable blade engagement assembly, and a multi-functional fixed blade engagement assembly. The multi-functional fixed blade engagement assembly can be disposed at a second end of the blade support frame. The multi-functional fixed blade engagement assembly can include a first clamping structure that secures a first end of a blade to the hacksaw with an engagement pin and a second clamping structure that secures a portion of the blade spaced apart from the first end to the hacksaw with a clamping or pinching force applied on the portion of the blade. The moveable blade engagement assembly can be operably coupled to the handle and a second end of the blade. Tension on the blade can be adjusted by adjusting the moveable blade engagement assembly.

Description

Technical Field

[0001] The exemplary embodiments generally relate to cutting devices, and more specifically to hacksaws having a tensioning mechanism integrated into the handle. Background Technology

[0002] A hacksaw is a useful tool for cutting various types of media, including metal. While some hacksaws are electric, most are manually operated and most also include a saw blade mounted through mounting holes at opposite longitudinal ends of the blade. A C-frame extends forward from the handle such that opposite ends of the C-frame engage the mounting holes via pins or other mounting devices passing through them. A hacksaw typically includes (for example, at the C-frame opposite the handle) a tensioning mechanism that pulls one of the pins to increase tension on the saw blade by stretching it between the mounting holes.

[0003] In many cases, the handle is a pistol grip attached to a portion of a C-frame that is separated from or spaced apart from the nearest opposite end of the C-frame. This configuration effectively frees up each opposite end of the C-frame, allowing the tensioning mechanism to be positioned at either end. However, these conventional hacksaws typically only use a single blade size between pins designed to be precisely mounted at opposite ends of the C-frame. This inflexible configuration results in a relatively large tool that can take up considerable space when stored and may not be ideal for placement in most tool bags or cases for transport. Therefore, an improved configuration that can be used with multiple blade sizes and is easier to store or transport is desirable. Summary of the Invention

[0004] Some exemplary embodiments enable the provision of improved hacksaws. The hacksaw may include a saw blade support frame, a handle operably coupled to the saw blade support frame at a first end, a movable saw blade engagement assembly, and a multi-functional fixed saw blade engagement assembly. The multi-functional fixed saw blade engagement assembly may be disposed at a second end of the saw blade support frame. The multi-functional fixed saw blade engagement assembly may include a first clamping structure and a second clamping structure, the first clamping structure securing the first end of the saw blade to the hacksaw via an engagement pin, and the second clamping structure securing that portion of the saw blade to the hacksaw by clamping or tightening force applied to a portion of the saw blade spaced apart from the first end. The movable saw blade engagement assembly may be operably coupled to the handle and the second end of the saw blade. Tension on the saw blade can be adjusted by adjusting the movable saw blade engagement assembly.

[0005] In another exemplary embodiment, a hacksaw may be provided, including a saw blade support frame, a handle operably coupled to the saw blade support frame at a first end, a (first) multi-functional fixed saw blade engagement assembly, and a second saw blade engagement assembly. The multi-functional fixed saw blade engagement assembly may be disposed at a second end of the saw blade support frame. The multi-functional fixed saw blade engagement assembly may include a first clamping structure and a second clamping structure, the first clamping structure securing the first end of the saw blade to the hacksaw via an engagement pin, and the second clamping structure securing that portion of the saw blade to the hacksaw by clamping or tightening force applied to a portion of the saw blade spaced apart from the first end. The second saw blade engagement assembly may be operably coupled to the handle and the second end of the saw blade.

[0006] In yet another exemplary embodiment, a hacksaw may be provided, comprising a saw blade support frame, a handle operably coupled to the saw blade support frame at a first end of the saw blade support frame, a movable saw blade engagement assembly, and a fixed saw blade engagement assembly. The fixed saw blade engagement assembly may be disposed at a second end of the saw blade support frame. The movable saw blade engagement assembly may be operably coupled to the handle and a second end of the saw blade. Tension on the saw blade can be adjusted by adjustment at the movable saw blade engagement assembly and by a corresponding linear movement of the movable saw blade engagement assembly. Attached Figure Description

[0007] Having already described some exemplary embodiments in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and in which:

[0008] Figure 1 This is a block diagram of a hacksaw according to an exemplary embodiment;

[0009] Figure 2 This is a side view of a saw blade and a hacksaw according to an exemplary embodiment;

[0010] Figure 3 This is a perspective view of a hacksaw according to an exemplary embodiment;

[0011] Figure 4 This is based on an exemplary embodiment. Figure 3 Exploded view of a hacksaw;

[0012] Figure 5 This is a perspective view of a multi-functional saw blade joining assembly according to an exemplary embodiment;

[0013] Figure 6 According to another exemplary embodiment Figure 5 Exploded view of the multi-functional saw blade joining assembly;

[0014] Figure 7 This is a separate view of the components of a movable saw blade engagement assembly according to yet another exemplary embodiment; and

[0015] Figure 8 This is a perspective and partially detached view of a movable saw blade joining assembly according to an exemplary embodiment. Detailed Implementation

[0016] Some exemplary embodiments will now be described more fully below with reference to the accompanying drawings, which illustrate some, but not all, of the exemplary embodiments. In fact, the examples described and depicted herein should not be construed as limiting the scope, applicability, or configuration of this disclosure. Rather, these exemplary embodiments are provided to enable this disclosure to meet applicable legal requirements. The same reference numerals throughout denote the same elements. Furthermore, as used herein, the term “or” should be interpreted as a logical operator that results in a true value whenever one or more of its operands are true. As used herein, an operative connection should be understood to refer to a direct or indirect connection that, in either case, enables functional interconnection of components operatively connected to each other.

[0017] Figure 1 A block diagram of a hacksaw 100 according to an exemplary embodiment is shown. The hacksaw 100 may include a handle 110 and a saw blade support frame 120. The saw blade support frame 120 is operatively connected at its first end to a multi-functional retaining assembly 130. The saw blade support frame 120 is also operatively coupled to a movable saw blade engagement assembly 140 adjacent to its second end. The movable saw blade engagement assembly 140 is also integrated into the handle 110.

[0018] The multi-functional fixed saw blade joining assembly 130 is configured to join the saw blade at one of two possible locations on the saw blade via two different joining structures. Which of the two different joining structures is used depends on the length of the saw blade used. In this respect, Figure 1 Two different saw blade sizes are shown, which can be joined by the hacksaw 100 of the exemplary embodiment.

[0019] A first (or short) saw blade 150 is shown in solid lines and has a first end 152 and a second end 154. The first end 152 is physically engaged by and held / retained by a first engagement structure of a multi-functional fixed saw blade engagement assembly 130. The first engagement structure is located in a fixed position (e.g., at the distal end of the saw blade support frame 120). In an exemplary embodiment, the first end 152 may include a first mounting hole through which a pin of the first engagement structure of the multi-functional fixed saw blade engagement assembly 130 is passed to engage the first saw blade 150.

[0020] Meanwhile, the second (longer) saw blade 150' is in Figure 1The diagram shows two components (i.e., the solid-lined portion of the first saw blade 150 and the dashed-lined portion extending from the second end 154 of the first saw blade 150). Thus, for the second saw blade 150', the first end 152 effectively marks the middle portion of the second saw blade 150'. This middle portion (again marked by the first end 152) does not include the aforementioned first mounting hole. Instead, the mounting hole for the second saw blade 150' is located at the first end 152' of the second saw blade 150'. Therefore, it can be seen that even when the multi-functional fixed saw blade engagement assembly 130 is fixedly engaged with the second saw blade 150', the mounting hole for the second saw blade 150' extends beyond the multi-functional fixed saw blade engagement assembly 130 and is therefore not engaged at all or freely engaged. In this respect, the middle portion of the second saw blade 150' (at the location marked by the first end 152 of the first saw blade 150) is physically engaged by and held / retained by the second engagement structure of the multi-functional fixed saw blade engagement assembly 130. The second engagement structure may include a clamp that can be fastened to the second saw blade 150' at the middle portion, as described in more detail below.

[0021] In an exemplary embodiment, the second end 154 may be the same for both the first saw blade 150 and the second saw blade 150'. The second end 154 may be physically engaged by and held / retained by a movable saw blade engagement assembly 140. The movable saw blade engagement assembly 140 (as the name suggests) may move relative to the handle 110 and / or the saw blade support frame 120 to increase (or decrease) the tension on the first saw blade 150. In this respect, when the multi-functional fixed saw blade engagement assembly 130 clamps or engages the first saw blade 150 or the second saw blade 150' in a fixed position (i.e., the first end 152 or the middle portion), the movable saw blade engagement assembly 140 engages the second end 154 and is movable relative to the handle 110 and the saw blade support frame 120 to carry the second end 154 away from the first end 152 or the middle portion to increase the tension on the first saw blade 150 or the second saw blade 150'. In an exemplary embodiment, the second end 154 may include a second mounting hole through which a pin of the movable saw blade engagement assembly 140 passes to engage the first saw blade 150 or the second saw blade 150'.

[0022] The specific components used to realize the first and second engagement structures of the movable saw blade engagement assembly 140 and the multifunctional fixed saw blade engagement assembly 130 can vary in different exemplary embodiments. However, in Figure 2-8 Some exemplary components are shown in more detail below in order to illustrate exemplary embodiments in a more detailed manner. In this regard, Figure 2 A side view of an exemplary embodiment of a hacksaw 200 and a saw blade 210 that can be held by the hacksaw 200 is shown. The hacksaw 200 is referenced above. Figure 1 An example of the described hacksaw 100. The saw blade 210 is... Figure 1 An example of the second saw blade, 150'. Figure 3 A perspective view of a hacksaw 200 without the saw blade 210 is shown. Figure 4 An exploded view of the hacksaw 200 is shown. Figure 5-8 It shows what can be used to implement Figure 1 The separate parts of the structure / components of the multifunctional fixed saw blade joining assembly 130 and the movable saw blade joining assembly 140.

[0023] First see Figure 2 The saw blade 210 includes a cutting edge 212 having a plurality of teeth thereon. The saw blade 100 also has a first end 213 and a second end 214, wherein a first mounting hole 215 and a second mounting hole 216 are respectively provided. In some cases, the cutting teeth may extend along all or almost all of the cutting edge 212. The saw blade 210 may also include a top edge 217, which may be arranged opposite to the cutting edge 212. Side edges may be arranged opposite each other, extending between the lateral edges of the cutting edge 212 and the top edge 217. Figure 2 Only one side 218 is shown, and it should be understood that the first mounting hole 215 and the second mounting hole 216 extend from the shown side 218 through the saw blade 210 to the opposite side (which is in Figure 2 (Not visible in the middle) Through hole.

[0024] The hacksaw 200 includes a handle portion 220 having a first end 222 and a second end 224. The handle portion 220 may also include a cavity 226 extending through its center along the longitudinal length of the handle portion 220. The cavity 226 may be shaped as part of a saw blade support frame 230 that receives the hacksaw 200. The handle portion 220 may also include one or more viewing windows 228 extending from one or both lateral sides of the handle portion 220 into the cavity 226. If instances of viewing windows 228 are provided on each lateral side of the handle portion 220, the combination of viewing windows 228 may substantially form a continuous opening through the handle portion 220 in a direction perpendicular to the longitudinal centerline of the handle portion 220.

[0025] The saw blade support frame 230 includes an insertion portion 232, an extension portion 234, and a connecting arm 236. The insertion portion 232, extension portion 234, and connecting arm 236 can be combined to form a C-shaped structure, as described above. However, in an exemplary embodiment, a large portion of the insertion portion 232 is inserted into the handle portion 220. When the saw blade 210 is held by the hacksaw 200 (e.g....), Figure 2As shown by the dashed line 238 in the diagram, a portion of the saw blade 210 is inserted into the insertion portion 232. When the saw blade 210 is held in the hacksaw 200, the extension portion 234 can extend substantially parallel to and spaced apart from the saw blade 210. Both the insertion portion 232 and the engagement arm 236 can extend away from the distal end of the extension portion 234 and toward the saw blade 210.

[0026] form Figure 1 The components of the example of the multi-functional fixed saw blade joining assembly 130 can be arranged at the joining arm 236, and... Figure 4-6 This is shown in more detail below. Formation Figure 1 The components of the example movable saw blade engagement assembly 140 can be operably coupled to the handle portion 220 and the insertion portion 232, and in Figure 4 , 7 This is shown in more detail in section 8.

[0027] Referring first to the components forming the multifunctional fixed saw blade engagement assembly 130, the engagement arm 236 may include a body portion 300 that extends substantially vertically away from the distal end of the extension portion 234. Except for a through-hole 302 that may be formed therein, extending through the body portion 300 in a direction substantially perpendicular to the extension direction of the extension portion 234 and the extension direction of the engagement arm 236, the body portion 300 may be substantially flat and continuous on its first lateral side. The body portion 300 may have a clamping member channel 310 formed on its second side (opposite to the first side). The clamping member channel 310 may have opposing shoulder members 312 on its opposing side. Each shoulder member 312 may include a pin receiver 314 formed at its distal end. When the saw blade 210 is mounted in the hacksaw 200, the shoulder members 312 may extend only partially along the length of the engagement arm 236 on the second side, and the top edge 217 of the saw blade 210 may be located near or immediately adjacent to one or both distal ends of the shoulder members 312.

[0028] The clamping surface 316 may be arranged near one or both distal ends of the shoulder member 312. When the saw blade 210 is mounted, if the saw blade 210 extends beyond the engagement arm 236 at attachment, the clamping surface 316 may extend parallel to one side of the saw blade 210 and potentially engage that side. However, if the saw blade 210 is shorter and actually terminates at the engagement arm 236 at attachment, the saw blade 210 may fit into a saw blade engagement groove 318 that may be formed in the clamping surface 316. The saw blade engagement groove 318 may be recessed from the clamping surface 316 and may be shaped to receive a first end 213 of the saw blade 210 and a first mounting hole 215 (i.e., for a saw blade 210 with a shorter length). Thus, the saw blade engagement groove 318 may have a depth relative to the clamping surface 316 that is approximately equal to the thickness of the saw blade 210 (e.g., approximately 0.6 mm). The first engagement pin 319 may be arranged at the saw blade engagement groove 318 to extend in length approximately equal to the depth of the saw blade engagement groove 318 (e.g., approximately 0.6 mm).

[0029] The clamping member 320 may be shaped to at least partially fit within the clamping member channel 310. In this respect, the lever arm 322 of the clamping member 320 may engage within the clamping member channel 310 and may have a pivot pin channel 324 formed therein. The clamping head 326 may be arranged at the end of the lever arm 322 near the pivot pin channel 324. The pivot pin 327 may extend through the pin receiver 314 of the shoulder member 312 and through the pivot pin channel 324. Meanwhile, the adjusting screw 330 may pass through the through hole 302 (and be threaded thereto). By rotating the adjusting screw 330 in a first direction, the adjusting screw 330 may move through the through hole 302 to push the proximal end of the lever arm 322 away from the engaging arm 236 (i.e., in a direction tending towards leaving the clamping member channel 310).

[0030] Therefore, the distal end of the lever arm 322 and the clamping member 320 will be forced toward the engaging arm 236, and more specifically toward the clamping surface 316, by pivoting about the pivot pin 327. Figure 5As shown, when the adjusting member 330 is rotated in the first direction indicated by arrow 380, the adjusting screw 330 applies the force indicated by arrow 382 on the lever arm 322. This force causes the clamping member 320 to pivot about the pivot pin 327, as indicated by arrow 384, which in turn applies a force from the clamping head 326 to the clamping surface 316, as indicated by arrow 386. If the saw blade 210 extends along the clamping surface 316 (e.g., due to a long saw blade in use), then rotation of the adjusting screw 330 can cause the clamping member 320 to be fastened to the saw blade 210. In this respect, one side of the saw blade 210 can be engaged by the clamping member 320, and the other side of the saw blade 210 can be adjacent to the clamping surface 316 (and the distal end of the first engaging pin 319). Therefore, the adjusting screw 330 is adjusted to increase the clamping force applied to the opposite side of the saw blade 210. Figure 2 The dashed line 333 in the figure shows the approximate location of the contact surface where the clamping member 320 and the clamping surface 316 are clamped or engaged with the saw blade 210.

[0031] If the saw blade 210 is short and terminates at the engagement arm 236, then the first mounting hole 215 can receive the first engagement pin 319 when the first end 213 of the saw blade 210 rests in the saw blade engagement groove 318. The clamping member 320 can still be fastened as described above. However, in this example, clamping force is not the primary means of holding the saw blade 210. Instead, the first engagement pin 319 can hold the first end 213 of the saw blade 213.

[0032] As can be understood from the above description, the multiple functions of the multifunctional fixed saw blade engagement assembly 130 may include clamping, holding, or securing the end of the saw blade 210 or a portion of the saw blade 210 spaced apart from that end. These are two different functions, and due to the different characteristics of the saw blade 210 at these locations, two different strategies and structures are required for engagement. A first clamping structure for achieving one of these functions can therefore be configured to engage with a mounting hole, and a second clamping structure can alternatively be configured to clamp the saw blade 210 since there is no mounting hole spaced apart from the end of the saw blade 210. In each case, the clamping member 320 may form part of the corresponding clamping structure, but different surfaces (i.e., clamping surface 316 or saw blade engagement groove 318) are associated with each clamping structure. Moreover, only one surface (i.e., saw blade engagement groove 318) actively adopts or requires the first engagement pin 319 as part of the clamping structure.

[0033] Now go to Figure 1 The components of the movable saw blade engagement assembly 140, in Figure 4 , 7As can be seen in Figure 8, the rotatable member 400 can be configured to engage with the second end 224 of the handle portion 220. The rotatable member 400 may include a protrusion 410 extending into the cavity 226 of the handle portion 220. The protrusion 410 may include an axial channel 412 terminating in a nut retaining chamber 414. The nut retaining chamber 414 may have a lateral inlet cavity that allows the adjusting nut 420 to slide into the nut retaining chamber 414 before engaging the tensioning rod 422. In this respect, the tensioning rod 422 may have a threaded portion 424 at one end. The adjusting nut 420 is captured within the nut retaining chamber 414 (and cannot rotate relative to the rotatable member 400). A second engagement pin 426 may be located at the opposite end of the tensioning rod 422 relative to the threaded portion 424. The second engagement pin 426 may extend at an angle (not necessarily, although possibly perpendicular) relative to the longitudinal axis of the second engagement pin 426.

[0034] like Figure 4 As shown, the insertion portion 232 may include a rod channel 430 at its proximal end opposite the engagement arm 236. The rod channel 430 may be large enough to receive the tension rod 422. The insertion portion 232 may also include an engagement chamber 432 into which the rod channel 430 extends from the proximal end of the insertion portion 232. When the insertion portion 232 is inserted into the cavity 226 of the handle portion 220, the engagement chamber 432 may be aligned with the viewing window 228 of the handle portion 220. The second engagement pin 426 may generally remain visible in the engagement chamber 432 through the viewing window 228 so that the second engagement pin 426 can be aligned with and inserted into the first mounting hole 215.

[0035] Although not strictly necessary, in some embodiments, the helical spring 440 may be arranged on the tension bar 422, near the washer 442 at the distal end of the abutment 410. When the tension on the saw blade 210 decreases, the helical spring 440 may be compressed between the washer 442 or the distal end of the protrusion 410 and the insertion portion 232 of the adjacent bar channel 430. Simultaneously, when the tension on the saw blade 210 increases, the helical spring 440 may be released, thereby contributing to an increase in tension.

[0036] In a typical case, the second end 214 of the saw blade 210 can be inserted into the saw blade channel 450 in the insertion portion 232. The second engagement pin 426 can be aligned with and inserted into the first mounting hole 215 of the saw blade 210. Then, by rotating the adjusting screw 330 as described above, the contact surface can be held between the clamping head 326 and the clamping surface 316 by the clamping member 320. Alternatively, if the saw blade 210 is short, the first engagement pin 319 can be inserted into the first mounting hole 215 to hold the first end 213 of the saw blade 210.

[0037] Subsequently, tension can be applied (to increase or decrease the saw blade tension) by rotating the rotatable member 400. In this respect, the rotation of the rotatable member 400 will carry the adjusting nut 420, as the adjusting nut 420 is trapped within the nut retaining chamber 414. When the adjusting nut 420 rotates together with the rotatable member 400, the threaded portion 424 of the tensioning rod 422 is pulled through the adjusting nut 420, or the second engaging pin 426 is pulled backward in the direction of arrow 460 to increase tension, or the second engaging pin 426 is pushed forward in the direction of arrow 470 to decrease tension (depending on the direction of rotation). Thus, the rotational motion of the rotatable member 400 about an axis (e.g., the longitudinal axis of the saw blade 210 and the handle portion 220) is converted into linear motion of the tensioning rod 422.

[0038] In an exemplary embodiment, a hacksaw may be provided. The hacksaw may include a saw blade support frame, a handle operably coupled to the saw blade support frame at a first end, a movable saw blade engagement assembly, and a multi-functional fixed saw blade engagement assembly. The multi-functional fixed saw blade engagement assembly may be disposed at a second end of the saw blade support frame. The multi-functional fixed saw blade engagement assembly may include a first clamping structure and a second clamping structure, the first clamping structure securing the first end of the saw blade to the hacksaw via an engagement pin, and the second clamping structure securing that portion of the saw blade to the hacksaw by clamping or tightening force applied to a portion of the saw blade spaced apart from the first end. The movable saw blade engagement assembly may be operably coupled to the handle and the second end of the saw blade. Tension on the saw blade can be adjusted by adjusting the movable saw blade engagement assembly.

[0039] In some embodiments, the features of the above-described device may be added or modified, or additional features may be added. These additions, modifications, and additions may be optional and may be provided in any combination. Therefore, although some exemplary modifications, additions, and additions are listed below, it should be understood that any of the modifications, additions, and additions may be implemented individually or in combination with one or more, or even all, of the other listed modifications, additions, and additions. Thus, for example, the saw blade support frame may include an insertion portion inserted into a handle, an extension portion extending from the insertion portion away from the handle, and an engagement arm where a multi-functional fixed saw blade engagement assembly may be disposed. In an exemplary embodiment, a second clamping structure may include a clamping surface disposed at the engagement arm. The multi-functional fixed saw blade engagement assembly may include a clamping member having a lever arm and a clamping head. An adjusting screw may be operably coupled to the lever arm to pivot the clamping member such that displacement of the lever arm away from the engagement arm forces the clamping head toward the clamping surface. In some cases, a pivot pin may be provided to pass through a portion of the lever arm and a shoulder member disposed on opposite sides of a clamping member channel formed at the engagement arm. A pivot pin may define a pivot axis about which the clamping member pivots in response to the operation of an adjusting screw. In an exemplary embodiment, the first clamping structure may include a saw blade engagement groove formed on a portion of the clamping surface. The saw blade engagement groove may include an engagement pin (i.e., an engagement pin extending away from the surface of the saw blade engagement groove). The saw blade engagement groove may be a recessed portion of the clamping surface having a depth approximately equal to the width of the saw blade. In some cases, a multi-functional fixed saw blade engagement assembly may be configured to hold a first saw blade having a first length and a second saw blade having a second length, the first saw blade extending from the multi-functional fixed saw blade engagement assembly via the first clamping structure to a point inside the handle, and the second saw blade extending from a point inside the handle along a saw blade support frame and extending beyond the multi-functional fixed saw blade engagement assembly via the second clamping structure. In an exemplary embodiment, a movable saw blade engagement assembly may include a rotatable member operatively coupled to a tension bar. A rotatable member may be disposed at the distal end of the handle and may extend into a cavity formed in the handle to engage with a tension bar, thereby altering the tension applied to the saw blade via rotation of the rotatable member. In some cases, the tension bar may have a threaded portion at its first end and a second engaging pin disposed near its second end. The rotatable member may engage a nut operably coupled to the threaded portion. Rotation of the rotatable member in a first direction causes the nut to rotate to carry the tension bar linearly away from the saw blade support frame, and rotation of the rotatable member in a second direction causes the nut to rotate to carry the tension bar linearly toward the saw blade support frame. In an exemplary embodiment, a helical spring may be disposed around the tension bar and may be biased to help increase the tension in the saw blade as the rotatable member rotates in the second direction.

[0040] Benefiting from the teachings presented in the foregoing description and associated drawings, those skilled in the art will conceive of many modifications and other embodiments of the invention set forth herein. Therefore, it should be understood that the invention is not limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims. Furthermore, while the foregoing description and associated drawings describe exemplary embodiments in the context of certain exemplary combinations of elements and / or functions, it should be understood that different combinations of elements and / or functions may be provided by alternative embodiments without departing from the scope of the appended claims. In this regard, for example, combinations of elements and / or functions different from those explicitly described above are also contemplated as being set forth in some of the appended claims. Where advantages, benefits, or solutions to problems are described herein, it should be understood that such advantages, benefits, and / or solutions may be applicable to some exemplary embodiments but not necessarily to all exemplary embodiments. Therefore, any advantages, benefits, or solutions described herein should not be considered critical, essential, or necessary to all embodiments or the embodiments claimed herein. Although specific terms are used herein, they are used only in a general and descriptive sense and not for limiting purposes.

Claims

1. A hacksaw, comprising: Saw blade support frame; A handle, which is operably connected to the saw blade support frame at a first end of the saw blade support frame; A multifunctional fixed saw blade joining assembly is disposed at the second end of the saw blade support frame. The multifunctional fixed saw blade joining assembly includes a first clamping structure and a second clamping structure. The first clamping structure is used to fix a first end of a first saw blade having a first length to the hacksaw by means of a joining pin. The second clamping structure is used to fix said portion of the second saw blade having a second length to the hacksaw by means of a clamping or clamping force applied to a portion of the second saw blade having a second length spaced apart from its first end. The second length is greater than the first length. as well as A movable saw blade engagement assembly is operably coupled to the handle and a second end of the first saw blade or the second saw blade, and the movable saw blade engagement assembly is coupled to the second end of the first saw blade when the first clamping structure secures the first end of the first saw blade to the hacksaw, and is coupled to the second end of the second saw blade when the second clamping structure secures the portion of the second saw blade to the hacksaw. Specifically, in response to rotating the rotatable member in a first direction to carry the movable saw blade engagement assembly and the second end of the first or second saw blade away from the multifunctional fixed saw blade engagement assembly, and rotating the rotatable member in a second direction to carry the movable saw blade engagement assembly and the second end of the first or second saw blade toward the multifunctional fixed saw blade engagement assembly, the tension on the first or second saw blade can be adjusted by adjusting the movable saw blade engagement assembly and the corresponding linear movement of the movable saw blade engagement assembly. Depending on the length of the first or second saw blade used, the multi-functional fixed saw blade engagement assembly is configured to engage the first or second saw blade at the first end of the first saw blade or at the portion of the second saw blade spaced apart from its first end via the first or second clamping structure.

2. The hacksaw according to claim 1, wherein, The saw blade support frame includes an insertion portion that inserts into the handle, an extension portion extending from the insertion portion away from the handle, and a connecting arm. The multifunctional fixed saw blade joining assembly is arranged at the joining arm.

3. The hacksaw according to claim 2, wherein, The second clamping structure includes a clamping surface disposed on the engaging arm. The multifunctional fixed saw blade joining assembly includes a clamping member with a lever arm and a clamping head, and The adjusting screw is operably connected to the lever arm to pivot the clamping member, such that the displacement of the lever arm away from the engaging arm forces the clamping head toward the clamping surface.

4. The hacksaw according to claim 3, wherein, A pivot pin passes through a portion of the lever arm and a shoulder member arranged on the opposite side of a clamping member channel formed on the engaging arm. The pivot pin defines a pivot axis, and the clamping member rotates about the pivot axis in response to the operation of the adjusting screw.

5. The hacksaw according to claim 3, wherein, The first clamping structure includes a saw blade engagement groove formed on a portion of the clamping surface, the saw blade engagement groove including an engagement pin, and The saw blade engagement groove is a recessed portion of the clamping surface, and the recessed portion has a depth approximately equal to the width of the first saw blade.

6. The hacksaw according to claim 1, wherein, The multi-functional fixed saw blade engagement assembly is configured to hold a first saw blade having the first length and a second saw blade having the second length, the first saw blade extending from the multi-functional fixed saw blade engagement assembly to a point inside the handle via the first clamping structure, and the second saw blade extending from a point inside the handle along the saw blade support frame and extending beyond the multi-functional fixed saw blade engagement assembly via the second clamping structure.

7. The hacksaw according to claim 1, wherein, The movable saw blade engagement assembly includes the rotatable member operably coupled to the tension bar. The rotatable member is disposed at the distal end of the handle and extends into a cavity formed in the handle to engage with the tension bar, thereby changing the tension applied to the first or second saw blade via the rotation of the rotatable member.

8. The hacksaw according to claim 7, wherein, The tensioning rod has a threaded portion at its first end and a second engaging pin arranged near its second end. The rotatable member captures a nut operably coupled to the threaded portion, and The rotation of the rotatable member in the first direction causes the nut to rotate so as to carry the tension rod linearly away from the saw blade support frame, and the rotation of the rotatable member in the second direction causes the nut to rotate so as to carry the tension rod linearly toward the saw blade support frame.

9. The hacksaw according to claim 8, wherein, A helical spring is arranged around a tension bar and is biased to help increase the tension in the first or second saw blade as the rotatable member rotates in the second direction.

10. A hacksaw, comprising: Saw blade support frame; A handle, which is operably connected to the saw blade support frame at a first end of the saw blade support frame; A multifunctional fixed saw blade joining assembly is disposed at the second end of the saw blade support frame. The multifunctional fixed saw blade joining assembly includes a first clamping structure and a second clamping structure. The first clamping structure is used to fix a first end of a first saw blade having a first length to the hacksaw by means of a joining pin. The second clamping structure is used to fix said portion of the second saw blade having a second length to the hacksaw by means of a clamping or clamping force applied to a portion of the second saw blade having a second length spaced apart from its first end. The second length is greater than the first length. as well as A second saw blade engagement assembly is operably coupled to the handle and a second end of the first saw blade or the second saw blade. The second saw blade engagement assembly is coupled to the second end of the first saw blade when the first clamping structure secures the first end of the first saw blade to the hacksaw, and to the second end of the second saw blade when the second clamping structure secures the portion of the second saw blade to the hacksaw. In response to rotating a rotatable member in a first direction to carry the second saw blade engagement assembly and the second end of the first or second saw blade away from the multi-functional fixed saw blade engagement assembly, and rotating the rotatable member in a second direction to carry the second saw blade engagement assembly and the second end of the first or second saw blade toward the multi-functional fixed saw blade engagement assembly, the tension on the first or second saw blade can be adjusted by adjusting the second saw blade engagement assembly and the corresponding linear movement of the second saw blade engagement assembly. Therefore, depending on the length of the first or second saw blade used, the multi-functional fixed saw blade engagement assembly is configured to engage the first or second saw blade at the first end of the first saw blade or at the portion of the second saw blade spaced apart from its first end via the first or second clamping structure.

11. The hacksaw according to claim 10, wherein, The saw blade support frame includes an insertion portion that inserts into the handle, an extension portion extending from the insertion portion away from the handle, and a connecting arm. The multifunctional fixed saw blade joining assembly is arranged at the joining arm.

12. The hacksaw according to claim 11, wherein, The second clamping structure includes a clamping surface disposed on the engaging arm. The multifunctional fixed saw blade joining assembly includes a clamping member with a lever arm and a clamping head, and The adjusting screw is operably connected to the lever arm to pivot the clamping member, such that the displacement of the lever arm away from the engaging arm forces the clamping head toward the clamping surface.

13. The hacksaw according to claim 12, wherein, A pivot pin passes through a portion of the lever arm and a shoulder member arranged on the opposite side of a clamping member channel formed on the engaging arm. The pivot pin defines a pivot axis, and the clamping member rotates about the pivot axis in response to the operation of the adjusting screw.

14. The hacksaw according to claim 12, wherein, The first clamping structure includes a saw blade engagement groove formed on a portion of the clamping surface, the saw blade engagement groove including an engagement pin, and The saw blade engagement groove is a recessed portion of the clamping surface, and the recessed portion has a depth approximately equal to the width of the first saw blade.

15. The hacksaw according to claim 10, wherein, The multi-functional fixed saw blade engagement assembly is configured to hold a first saw blade having the first length and a second saw blade having the second length, the first saw blade extending from the multi-functional fixed saw blade engagement assembly to a point inside the handle via the first clamping structure, and the second saw blade extending from a point inside the handle along the saw blade support frame and extending beyond the multi-functional fixed saw blade engagement assembly via the second clamping structure.

16. A hacksaw, comprising: Saw blade support frame; A handle, which is operably connected to the saw blade support frame at a first end of the saw blade support frame; A fixed saw blade engagement assembly is arranged at the second end of the saw blade support frame; as well as A movable saw blade joining assembly is operably coupled to the handle and a second end of a first saw blade having a first length or a second saw blade having a second length, wherein the second length is greater than the first length, and the movable saw blade joining assembly is coupled to the second end of the first saw blade when a fixed saw blade joining assembly secures the first end of the first saw blade to the hacksaw, and is coupled to the second end of the second saw blade when the fixed saw blade joining assembly secures a portion of the second saw blade spaced apart from its first end to the hacksaw. In response to rotating the rotatable member in a first direction to carry the movable saw blade engagement assembly and the second end of the first or second saw blade away from the fixed saw blade engagement assembly, and rotating the rotatable member in a second direction to carry the movable saw blade engagement assembly and the second end of the first or second saw blade toward the fixed saw blade engagement assembly, the tension on the first or second saw blade can be adjusted by adjustment at the movable saw blade engagement assembly and the corresponding linear movement of the movable saw blade engagement assembly.

17. The hacksaw according to claim 16, wherein, The movable saw blade engagement assembly includes the rotatable member operably coupled to the tension bar. The rotatable member is disposed at the distal end of the handle and extends into a cavity formed in the handle to engage with the tension bar, thereby changing the tension applied to the first or second saw blade via the rotation of the rotatable member.

18. The hacksaw according to claim 17, wherein, The tensioning rod has a threaded portion at its first end and a connecting pin arranged near its second end. The rotatable member captures a nut operably coupled to the threaded portion, and The rotation of the rotatable member in the first direction causes the nut to rotate so as to carry the tension rod linearly away from the saw blade support frame, and the rotation of the rotatable member in the second direction causes the nut to rotate so as to carry the tension rod linearly toward the saw blade support frame.

19. The hacksaw according to claim 18, wherein, A helical spring is arranged around a tension bar and is biased to help increase the tension in the first or second saw blade as the rotatable member rotates in the second direction.

20. The hacksaw of claim 16, wherein the corresponding linear movement of the movable saw blade engagement assembly is aligned with the longitudinal centerline of the first saw blade or the second saw blade and the handle.

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