JP2016165776A - Cutter blade attachment device and electric tool including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting blade attachment device which enables easy attachment or detachment of a cutting blade and achieves improvement of the attachment rigidity of the cutting blade to maintain the stable attachment state.SOLUTION: In a cutting blade attachment device 20, a blade attachment/detachment part 20B, to which a cutting blade 13 is detachably attached, includes: an opening space part 41 for inserting or removing the cutting blade 13; a pin member 42 which protrudes to an inner part of the opening space part 41 and may fit in an opening hole 13a formed in the cutting blade 13; a plate-like elastic member 43 which is installed so as to enclose at least a part of a periphery of the pin member 42 and has an elastic force; and a pressing member 44 which exerts a pressing force against the elastic force exerted by the plate-like elastic member 43.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a blade blade mounting device and an electric tool including the blade blade mounting device.

  2. Description of the Related Art Conventionally, there is known a blade blade attachment device that is installed on a blade arbor that can be reciprocated by a driving force from a drive source included in an electric tool, and that can be attached to and detached from the blade arbor installation side. It has been. Conventionally, in this type of blade blade mounting device, the blade blade is locked and unlocked by rotating the operation sleeve, that is, by loosening the screw (for example, see Patent Document 1 below).

  However, in the above conventional blade blade mounting device, when replacing the blade blade, it is necessary to rotate and loosen or tighten the operation sleeve, so that it is complicated and very inconvenient to lock and unlock the blade blade. There were challenges. Therefore, in order to solve such a problem, for example, in the invention described in Patent Document 2 below, a blade blade mounting device that can easily lock and unlock the blade blade by one-touch operation of an operation button or an operation sleeve Has been proposed.

Japanese Utility Model Publication No. 4-109101 JP 2000-84729 A

  However, in the invention according to Patent Document 2 listed above, the lock piston [26] provided with the engagement pin [26d] is guided and moved by the guide surface of the clamp body [11] fixed to the slider. is set up. During the cutting operation by the blade [2], most of the cutting resistance is loaded on the engaging pin portion [26d], which may damage the guide surface.

  Moreover, in another embodiment described in Patent Document 2, a configuration in which an engagement pin portion [1e] is formed on a flat surface [1a] of a slider [1] is disclosed as a means for solving the above-described problems. Yes. However, in the case of this embodiment, there is a problem that when the blade is removed, the hole of the blade [2] is caught in the engaging pin portion [1e], and workability is reduced (inside []). The code | symbol of (*) has shown the code | symbol described in patent document 2.).

  The present invention has been made in view of various problems existing in the above-described prior art, and an object of the present invention is to enable the blade blade to be easily attached and detached and to maintain a stable mounting state. It is an object of the present invention to provide a blade blade mounting device with improved mounting rigidity and an electric tool including the blade blade mounting device.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis writing, However, This invention is not limited to the form of illustration by it.

  The blade blade attaching device (20) according to the present invention is installed on a blade arbor (12) that is reciprocally movable by a driving force from a driving source included in the electric tool (10), and the blade arbor (12). A blade blade attachment device (20) capable of detaching and attaching a blade blade (13) to a side opposite to the installation side, wherein a blade attaching / detaching portion (20B) for attaching and detaching the blade blade (13) includes the blade blade (13). An opening space portion (41) for inserting and removing a pin member, and a pin member that protrudes toward the inside of the opening space portion (41) and can be fitted into an opening hole (13a) formed in the blade blade (13) ( 42), a plate-like elastic member (43) having an elastic force installed so as to surround at least a part of the periphery of the pin member (42), and the plate-like elastic member (43) A pressing member (44) capable of exerting a pressing force against the elastic force possessed by the pressing member (44) in a state in which the pressing force to the plate-like elastic member (43) is released. When the blade blade (13) is inserted into the open space portion (41), the plate-like elastic member (43) guides the insertion of the blade blade (13) into the open space portion (41), and the blade blade When the pressing force of the pressing member (44) is exerted on the plate-like elastic member (43) with the (13) inserted into the opening space (41), the blade blade (13) The pin member (42) is fitted into the formed opening hole (13a), and the blade blade (13) is attached to the blade attaching / detaching portion (20B), and the blade attaching / detaching portion (20 When the pressing force applied to the plate-like elastic member (43) by the pressing member (44) is released from the state where the blade blade (13) is attached to the plate-like elastic member, the plate-like elastic member The fitting state between the opening hole (13a) formed in the blade (13) and the pin member (42) is released by the elastic force of (43).

In cutter blade mounting device (20) according to the present invention, the open space portion (41), the angle between the blade blade (13) plane wall is pressed (41a _1), to the plane wall surface (41a ₁₎ An inclined wall surface (41a ₂ ) provided so as to have a wedge-shaped space formed by the planar wall surface (41a ₁ ) and the inclined wall surface (41a ₂ ). The pressing force that resists the elastic force of the plate-like elastic member (43) that can be exerted by the pressing member (44) is configured to have a wedge shape along the opening space (41). It can be exerted by a spring-like elastic member (45) installed in the.

  Further, in the blade mounting apparatus (20) according to the present invention, the pressing member (44) installed with respect to the opening space (41) is an operation lever provided outside the opening space (41). The pressing member (44) presses the plate-like elastic member (43) by the elastic force exerted by the spring-like elastic member (45) and is always operated. When a person operates the operating lever portion (46) to apply a force against the elastic force exerted by the spring-like elastic member (45) to the pressing member (44), the pressing member (44) The pressing force to the plate-like elastic member (43) due to can be released.

  Furthermore, in the blade blade mounting device (20) according to the present invention, the surface of the pressing member (44) that presses the blade blade (13) surrounds at least a part of the periphery of the pin member (42). It can be formed.

  In addition, according to this invention, it is possible to provide an electric tool (10) provided with the blade blade attachment apparatus (20) mentioned above.

  According to the present invention, it is possible to easily attach and detach the blade blade, and to maintain a stable attachment state, the blade blade attachment device with improved attachment rigidity of the blade blade, and the electric tool including the blade blade attachment device are provided. Can be provided.

It is a figure showing the whole reciprocating saw composition as an electric tool concerning this embodiment. It is a figure which shows the side of the cutter blade attachment apparatus which concerns on this embodiment of the state in which the cutter blade was attached. It is the figure which showed the AA cross section in FIG. It is the figure which showed the BB cross section in FIG. It is the figure which showed CC cross section in FIG. It is the figure which showed the DD cross section in FIG. It is the figure which showed the EE cross section in FIG. It is a disassembled perspective view of the cutter blade attachment apparatus which concerns on this embodiment containing a cutter blade. It is a figure for demonstrating the operating method of the blade blade attachment apparatus which concerns on this embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  FIG. 1 is a diagram illustrating an overall configuration of a reciprocating saw 10 as an electric tool according to the present embodiment. The reciprocating saw 10 according to the present embodiment is installed in a housing 11, a blade arbor 12 that can be reciprocated by a driving force from a driving source (not shown) installed in the housing 11, and the blade arbor 12. In addition, the blade blade mounting device 20 can be attached to and detached from the blade arbor installation side, and the blade blade 13 is mounted on the blade blade mounting device 20 and performs processing such as cutting. Configured.

  The reciprocating saw 10 according to the present embodiment is configured to operate based on the power supplied via the power cord 14, but the scope of the present invention is not limited to the form shown in FIG. The present invention can be applied to any configuration of power tools such as those used. Further, the blade 13 according to the present embodiment is an example of a reciprocating saw blade used for pruning trees, rough cutting of wood, etc., but the blade blade applicable to the present invention is processed by a reciprocating motion. Any type of material processing is included. For example, reciprocating saw blades that can cut all materials such as thin steel materials, control panels, veneers, jig saw blades, wire brushes, files, scrapers for peeling adhesives, paints, etc. A cutter blade is included in the scope of the present invention.

  Next, a specific configuration of the blade blade mounting device 20 according to the present embodiment will be described with reference to FIGS. Here, FIG. 2 is a view illustrating a side surface of the blade blade mounting device 20 according to the present embodiment in a state where the blade blade 13 is mounted. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. 5 is a cross-sectional view taken along the line CC in FIG. 3, FIG. 6 is a cross-sectional view taken along the line DD in FIG. 3, and FIG. 7 is a cross-sectional view taken along the line EE in FIG. Further, FIG. 8 is an exploded perspective view of the blade blade mounting device 20 according to this embodiment including the blade blade 13.

  As shown in FIG. 2, the blade blade mounting apparatus 20 according to the present embodiment has two main components: an arbor connection portion 20 </ b> A that is connected and fixed to the blade arbor 12, and a blade attachment and detachment portion 20 </ b> B that attaches and detaches the blade blade 13. It has a region.

  As shown in the sectional view of FIG. 3 and the like, the arbor connecting portion 20A includes an arbor insertion hole 31 for inserting a blade arbor 12 configured as a shaft-shaped member, and a blade arbor inserted into the arbor insertion hole 31. 12 and a fixing screw hole 32 for screwing in a screw (not shown) for applying a pressing force for fixing. In addition, about the hole shape of the arbor insertion hole 31, arbitrary shapes can be employ | adopted according to the external shape of the blade arbor 12, About the dimension of the screw not shown screwed in the screw hole 32 for fixation, etc. Also, it may be appropriately selected according to the specifications of the reciprocating saw 10 and the dimensional conditions of the blade arbor 12.

  On the other hand, as shown in the sectional views of FIGS. 3 to 7, the blade attaching / detaching portion 20 </ b> B protrudes toward the inside of the opening space portion 41 and the opening space portion 41 for inserting and removing the blade blade and the blade. A pin member 42 that can be fitted into the opening 13 a formed in the blade 13, a plate-like elastic member 43 that has an elastic force installed so as to surround the periphery of the pin member 42, and an elastic force that the plate-like elastic member 43 has And a pressing member 44 capable of exerting a pressing force against the above.

Open space portion 41 includes a planar wall surface 41a ₁ of knives blade 13 is pressed against the space portion 41a configured to have a slope wall 41a ₂ provided so as to have an angle to the plane wall 41a _1, cutlery In order to insert and remove the blade 13, it has an opening 41b that opens outward. Space 41a configured as a space surrounded by the flat wall 41a ₁ and the slope wall 41a ₂ is constructed as a wedge-shaped space just wedge-shaped. In this wedge-shaped space, a pressing member 44 having a wedge shape along the wedge-shaped space is installed.

Pressing member 44, as described above, are configured with a wedge shape along the wedge-shaped space formed by the flat wall 41a ₁ and the slope wall 41a _2, acute side of the wedge shape (e.g., A spring-like elastic member 45 is installed in the opening space 41 so as to exert a pressing force toward the right side of the drawing in FIG. Therefore, the pressing member 44 is configured to constantly receive a pressing force directed toward the opening 41b based on the elastic force from the spring-like elastic member 45.

Further, the pressing member 44 is configured to be integrated with an operation lever portion 46 provided outside the opening space portion 41. That is, as shown in detail in FIGS. 3 and 5, the operation lever portion 46 has a connecting shaft portion 46 a that protrudes toward the opening space portion 41, and the connecting shaft portion 46 a is a pressing member. 44 is integrally connected to 44 by a C ring 47 in an inseparable state. Then, the pressing member 44 and the operating lever unit 46 is installed so as to sandwich the site of slope walls 41a ₂ in the open space portion 41 is formed. Further, the connecting shaft portion 46a is installed so as to penetrate the through hole 48 for guiding the connecting shaft portion 46a formed in the blade attaching / detaching portion 20B. Therefore, the pressing member 44 installed against the opening space 41 is always pressed in the direction of the opening 41b by the elastic force exerted by the spring-like elastic member 45, and the operator operates the operation lever portion 46. by, when a force is applied against the elastic force exerted by the spring-like elastic member 45 to the pressing member 44, the pressing member 44 can slide moves along the inclined surface wall 41a ₂ in the direction away from the opening 41b It is configured as follows.

On the other hand, the pin member 42 is a shaft-like member that is fixedly installed with respect to the flat wall surface 41 a ₁ that constitutes the opening space 41. The pin member 42 has an axial diameter slightly smaller than the opening diameter of the opening hole 13 a formed in the blade 13, and the pin member 42 has an opening formed in the blade 13. It is a member that exhibits a function of engaging the blade blade 13 so that the blade blade 13 cannot be moved with respect to the blade attaching / detaching portion 20B when fitted into the hole 13a.

A plate-like elastic member 43 having an elastic force is provided around the pin member 42 so as to surround the pin member 42. The plate-like elastic member 43 is configured to have a shape that covers the pin member 42 when it is not subjected to a pressing force from the outside, and when receiving a pressing force from the outside, that is, As shown in FIG. 4 and the like, when the pressing force from the pressing member 44 is received, the shaft end portion of the pin member 42 is projected to fit the pin member 42 and the opening hole 13a formed in the blade 13. As a result, the flat wall surface 41a is deformed into a state of being crushed in the direction of ₁ . The elastic force exerted by the spring-like elastic member 45 is superior to the elastic force exerted by the plate-like elastic member 43. Therefore, in the present embodiment, the elastic force is always exerted by the spring-like elastic member 45. by an elastic force, the pressing member 44 so that the crushed toward the flat wall 41a ₁ direction presses the plate-like elastic member 43 is pressed in the direction of the opening 41b. When the operator slides the operation lever portion 46 to apply a force against the elastic force exerted by the spring-like elastic member 45 to the pressing member 44, the pressing member 44 applies the force to the plate-like elastic member 43. Since the pressing force is released, the plate-like elastic member 43 returns to a shape that covers the pin member 42, and when the pressing force of the plate-like elastic member 43 acts, the pin member 42 and the blade blade The fitting state with the opening hole 13a formed in 13 is released.

  The surface of the pressing member 44 that presses the blade 13 is preferably formed so as to surround at least a part of the periphery of the pin member 42. In this embodiment, as shown in FIG. A substantially U-shaped pressing surface is formed on the pressing member 44. When the pressing member 44 has such a shape, the pressing state of the blade blade 13 performed by the pressing member 44 can be made more stable.

  The specific configuration of the blade blade mounting device 20 according to the present embodiment has been described above. Next, a specific component configuration and assembling method of the blade blade mounting device 20 according to the present embodiment will be described with reference to FIG.

  The blade attachment device 20 according to this embodiment includes a housing main body 81 that forms the arbor connecting portion 20A and one side of the blade attaching / detaching portion 20B, and a housing cover portion 82 that forms the other side of the blade attaching / detaching portion 20B. have. The housing cover portion 82 is formed with a guide projection 82a that protrudes in the vertical direction in FIG. 8, while a guide groove 81a is formed at a position corresponding to the guide projection 82a in the housing body 81. Is formed. The housing body 81 and the housing cover 82 are formed with screw holes 81b and 82b, respectively. In the blade blade mounting device 20 according to the present embodiment, the guide protrusion 82a of the housing cover 82 is fitted into the guide groove 81a of the housing body 81 by sliding, and one screw hole is provided in this state. The housing main body 81 and the housing cover portion 82 can be reliably coupled with one screw 83 using 81b and 82b. That is, in this embodiment, since the guide protrusion 82a is slid and fitted into the guide groove 81a, a secure fixed state can be realized by using only one screw 83 as a fastening means. As a result, the blade blade mounting device 20 can be made compact.

Among the above-described configuration, the pin member 42 to opening hole 13a and fitting formed on the tool blade 13 is fixedly installed on a side plane wall 41a ₁ is formed of the housing body portion 81. Then, the plate-like elastic member 43 is fitted into the housing body 81 so as to cover the pin member 42. Further, the pressing member 44 and the operating lever portion 46 are integrally connected by the C ring 47 so as not to be separated so as to sandwich the inclined wall surface 41 a ₂ formed in the housing cover portion 82, and the integrated pressing member 44. The operation lever portion 46 is attached so as to be slidable along the inclined wall surface 41 a ₂ formed in the housing cover portion 82. Furthermore, the spring-like elastic member 45 is installed so as to press the pressing member 44 against the inside of the open space 41 formed inside by the coupling of the housing body 81 and the housing cover 82. It becomes.

  The specific component configuration and assembling method of the blade blade mounting device 20 according to the present embodiment have been described above. Next, operation | movement of the blade blade mounting apparatus 20 which concerns on this embodiment is demonstrated using FIG. Here, FIG. 9 is a figure for demonstrating the operating method of the blade blade mounting apparatus 20 which concerns on this embodiment.

A partial diagram (a) in FIG. 9 shows an initial state in which the blade 13 is not attached to the blade blade mounting device 20. At this time, the pressing member 44 is pressed in the direction of the opening 41b by the elastic force exerted by the spring-like elastic member 45. Further, the elastic force exerted by the spring-like elastic member 45 is plate-like elastic. since winning than the elastic force exerted by the member 43, the pressing member 44 presses the plate-like elastic member 43 by being pressed in the direction of the opening 41b, the plate-like elastic member 43 is a plan wall 41a ₁ direction It is in a state of being crushed toward.

When the operator operates the operation lever portion 46 in the direction of α as shown in the partial diagram (b) in FIG. 9 from the initial state shown in the partial diagram (a) in FIG. It becomes the force against the elastic force exerted by the elastic member 45 is applied against the pressing member 44, the pressing member 44 is moved slidingly along the slope wall 41a ₂ in the direction away from the opening 41b. Then, especially the opening part 41b of the opening space part 41 obstruct | occluded by the press member 44 is open | released, and the state which is easy to insert the blade 13 is implement | achieved. Further, since the pressing force to the plate-like elastic member 43 that has been crushed toward the plane wall surface 41a ₁ direction is released by the sliding movement of the pressing member 44, the plate-like elastic member 43 is a pin. The shape is deformed so as to cover the member 42. When the plate-like elastic member 43 is deformed so as to cover the pin member 42, the blade blade 13 inserted into the opening space 41 is guided to be inserted by the plate-like elastic member 43 at the time of insertion. Therefore, troubles such as the blade blade 13 being caught by the pin member 42 do not occur, and a smooth insertion operation of the blade blade 13 becomes possible. A state in which the blade 13 is inserted into the opening space 41 in this way is shown in a partial view (c) of FIG.

When the operator releases the operation of the operation lever portion 46 from the state shown in the partial diagram (c) in FIG. 9, as shown in the partial diagram (d) in FIG. 9, the pressing member 44 is spring-like elastic. moves toward the direction of the opening 41b by the action of an elastic force exerted by the member 45, the pressing member 44 so that the presses the knife blade 13 and the plate-like elastic member 43 to the plane wall 41a ₁ direction. Then, since the pin member 42 is fitted in the opening hole 13a formed in the blade blade 13, the blade blade 13 is engaged with the blade attaching / detaching portion 20B so that the blade blade 13 cannot move. The pressing member 44 according to the present embodiment is configured to have a wedge shape, so that the pressing member 44 can stably press the blade blade 13 and the plate-like elastic member 43 by the action of the wedge shape. It is like that.

  The operation when the blade blade 13 is mounted on the blade blade mounting apparatus 20 has been described above. When the blade blade 13 is removed from the blade blade mounting apparatus 20, a partial view (d) → (c) in FIG. The blade blade mounting device 20 may be operated in the order of (b) → (a).

That is, a partial diagram (d) in FIG. 9 shows a state in which the blade 13 is attached to the blade blade mounting device 20. At this time, the pressing member 44 is pressed in the direction of the opening 41b by the elastic force exerted by the spring-like elastic member 45, and further, the elastic force exerted by the spring-like elastic member 45 is the plate-like elastic member. Therefore, the pressing member 44 presses the blade blade 13 and the plate-like elastic member 43 when pressed in the direction of the opening 41b, and the plate-like elastic member 43 is a flat wall surface. 41a It is in a state of being crushed toward the _one direction, and the fitting state between the opening hole 13a formed in the blade 13 and the pin member 42 is maintained.

When the operator operates the operation lever portion 46 in the direction of symbol β from the state shown in the partial diagram (d) in FIG. 9 as shown in the partial diagram (c) in FIG. 9, the spring-like elasticity It becomes the force against the elastic force exerted by the member 45 is applied against the pressing member 44, the pressing member 44 is moved slidingly along the slope wall 41a ₂ in the direction away from the opening 41b. Then, the pressing force to the plate-like elastic member 43 that has been crushed toward the plane wall surface 41a ₁ by the sliding movement of the pressing member 44 is released, so that the plate-like elastic member 43 is a pin member. The shape is deformed so as to cover 42. When the plate-like elastic member 43 is deformed so as to cover the pin member 42, the fitting state between the opening hole 13a formed in the blade 13 and the pin member 42 is released. Note that the blade blade 13 pulled out from the opening space 41 is guided by the plate-like elastic member 43 at the time of extraction, so that the blade blade 13 is caught by the pin member 42. It will not occur, and a smooth blade blade 13 can be extracted. The state where the blade 13 is extracted from the inside of the opening space 41 in this way is shown in a partial diagram (b) in FIG.

When the operator releases the operation of the operation lever portion 46 from the state shown in the partial diagram (b) in FIG. 9, as shown in the partial diagram (a) in FIG. 9, the pressing member 44 is spring-like elastic. moves toward the direction of the opening 41b by the action of an elastic force exerted by the member 45, the pressing member 44 so that the pressed toward the plate-like elastic member 43 to the plane wall 41a ₁ direction. Then, the pressing member 44 is pressed in the direction of the opening 41b by the elastic force exerted by the spring-like elastic member 45, and further, the elastic force exerted by the spring-like elastic member 45 is the plate-like elastic member. since winning than the elastic force exerted by 43, the pressing member 44 presses the plate-like elastic member 43 by being pressed in the direction of the opening 41b, the plate-like elastic member 43 is in the plane wall 41a ₁ direction It becomes a state crushed toward. By realizing this state, the opening 41b is closed by the pressing member 44, and returns to the initial state of the blade blade mounting device 20 according to the present embodiment.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, in the above-described embodiment, the case where the shaft tip shape of the pin member 42 is formed as a substantially cylindrical member with slight chamfering is illustrated, but for example, a part of the shaft end portion on the opening 41b side is slanted. By adopting a shape that is cut into two, it is possible to make the fitting operation between the opening hole 13a formed in the blade 13 and the pin member 42 smooth and to maintain the fitting state stably. Is also possible.

  For example, in the embodiment described above, the pressing member 44 and the operation lever portion 46 are formed of two members. The use of such a configuration is for convenience in manufacturing, but the pressing member and the operation lever portion according to the present invention can be configured as one member. Further, in the above-described embodiment, the pressing member 44 and the operation lever portion 46 formed by two members are integrally connected by the C ring 47 so as not to be separated, but this connection means is limited to the C ring 47. For example, any connecting means such as press-fitting, welding joining, caulking joining, and rivet joining can be employed.

  For example, in the above-described embodiment, a substantially U-shaped pressing surface is formed on the pressing member 44. When the pressing member 44 has such a shape, the pressing state of the blade blade 13 performed by the pressing member 44 can be made more stable. However, the pressing surface of the pressing member according to the present invention is not limited to a substantially U-shaped pressing surface. The surface that presses the blade 13 of the pressing member according to the present invention may be formed so as to surround at least a part of the periphery of the pin member 42. For example, the surface that surrounds the entire periphery of the pin member 42. A square-shaped pressing surface may be formed on the pressing member of the present invention, or a pressing surface shaped to surround the pin member 42 diagonally may be formed on the pressing member of the present invention.

  Further, for example, in the above-described embodiment, as is apparent from FIG. 8, the description has been made on the assumption that the plate-like elastic member 43 is installed so as to surround the entire circumference of the pin member 42. However, the plate-like elastic member according to the present invention may be installed so as to surround at least a part of the periphery of the pin member 42. For example, the plate-like elastic member according to the present invention includes those having an external shape that is substantially U-shaped in plan view. That is, the plate-like elastic member according to the present invention can take any form on condition that the same effect as the above-described embodiment is exhibited.

  Further, for example, in the above-described embodiment, the arbor connecting portion 20A and the blade arbor 12 of the blade blade mounting device 20 are configured and fixed as separate members, but the arbor connecting portion 20A and the blade arbor 12 are integrated. It may be configured.

  Furthermore, although the blade blade mounting apparatus 20 illustrated in the above-described embodiment is used for the reciprocating saw 10, the blade blade mounting apparatus according to the present invention is applicable to any electric tool that uses a blade blade that performs a reciprocating operation. It can be applied to. Therefore, depending on the type and specification of the power tool to which the present invention is applied, the constituent members of the present invention can be arbitrarily changed in shape on the condition that the same effects as the above-described embodiment are exhibited. Is possible.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Reciprocating saw, 11 Housing, 12 Blade arbor, 13 Blade blade, 13a Open hole, 14 Power cord, 20 Blade blade mounting device, 20A Arbor connection part, 20B Blade attachment / detachment part, 31 Arbor insertion hole, 32 Fixing screw hole, 41 Opening space portion, 41a Space portion, 41a ₁ plane wall surface, 41a ₂ slope wall surface, 41b opening portion, 42 pin member, 43 plate-like elastic member, 44 pressing member, 45 spring-like elastic member, 46 operation lever portion, 46a connecting shaft Part, 47 C ring, 48 through hole, 81 housing body part, 81a guide groove part, 81b, 82b screw hole, 82 housing cover part, 82a guide projection part, 83 screw.

Claims (5)

A blade blade attachment device that is installed on a blade arbor that can be reciprocated by a driving force from a drive source included in the electric tool, and that can attach and detach a blade blade on the opposite side of the blade arbor installation side,
A blade attaching / detaching part for attaching and detaching the blade blade,
An opening space for inserting and removing the blade,
A pin member that protrudes toward the inside of the opening space and can be fitted into an opening hole formed in the blade.
A plate-like elastic member having an elastic force installed so as to surround at least a part of the periphery of the pin member;
A pressing member capable of exerting a pressing force against the elastic force of the plate-like elastic member;
By providing
When the blade blade is inserted into the opening space with the pressing force applied to the plate-shaped elastic member released by the pressing member, the plate-shaped elastic member guides insertion of the blade blade into the opening space. ,
When the pressing force of the pressing member is exerted on the plate-like elastic member in a state where the blade blade is inserted into the opening space portion, the pin member is inserted into the opening hole formed in the blade blade. The blade blade is attached to the blade attaching / detaching portion, and the blade blade is attached.
When the pressing force exerted on the plate-like elastic member by the pressing member is released from the state where the blade blade is attached to the blade attaching / detaching portion, the elastic force of the plate-like elastic member causes the A cutter blade mounting device, wherein a state in which the opening hole formed in the cutter blade is fitted into the pin member is released. In the blade blade mounting device according to claim 1,
The opening space is
A flat wall surface against which the blade is pressed;
A slope wall surface provided to have an angle with respect to the planar wall surface;
Having at least
The pressing member is configured to have a wedge shape along a wedge-shaped space formed by the planar wall surface and the inclined wall surface,
The blade blade mounting device according to claim 1, wherein a pressing force against an elastic force of the plate-like elastic member that can be exerted by the pressing member is exerted by a spring-like elastic member installed in the opening space. In the blade blade mounting apparatus according to claim 2,
The pressing member installed with respect to the opening space is provided integrally with an operation lever portion provided outside the opening space.
The pressing member always presses the plate-like elastic member by the elastic force exerted by the spring-like elastic member,
When the operator applies a force against the elastic force exerted by the spring-like elastic member to the pressing member by operating the operation lever portion, a pressing force to the plate-like elastic member by the pressing member is applied. A blade blade mounting device which is released. In the blade blade attachment device according to any one of claims 1 to 3,
The blade blade mounting device, wherein a surface of the pressing member that presses the blade blade is formed so as to surround at least a part of the periphery of the pin member.   An electric tool provided with the blade blade attachment apparatus of any one of Claims 1-4.

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