JP7616651B2 - Manual drilling tool for corrugated building materials - Google Patents

Description

This invention relates to a manual drilling tool that allows anyone to perform continuous drilling work accurately and safely without the need for skill when drilling through holes in the top surface of a convex portion of a corrugated building material.

As drilling tools used to drill through holes in the top surfaces of the protruding parts of corrugated building materials, manual drilling tools as shown in Patent Document 1 and electric drilling tools as shown in Patent Documents 2-6 have been proposed. The former manual drilling tools are lightweight and easy to handle, and are convenient in that they can be used easily even in conditions where there is no power source.

Both the manual drilling tool and the electric drilling tool are designed to cover the rotating drill member with a cylindrical guide member to prevent accidental contact with the drill member, and the drill member and guide member are in a relationship that allows them to move relatively along the axial direction of the drill member, with a coil spring biasing the guide member to move elastically toward the tip of the drill member.

In addition, to prevent the drilling position of the drill bit from shifting when drilling, the manual drilling tool, as in Patent Document 1, is provided with a joint seat portion shaped to fit the top surface of the convex portion of the corrugated building material on the contact surface of the guide member with the corrugated building material, and in the case of the electric drilling tool, as in Patent Documents 2 and 5, an elastic body is provided on the contact surface of the guide member with the corrugated building material, and when drilling with these joint seats or elastic bodies applied to the corrugated building material, the drill bit moves against the elastic force of the coil spring relative to the stopped guide member.

In the case of the structures in Patent Documents 2 to 4, in which the coil spring that elastically biases the guide member is exposed to the outside, experienced workers can use it without any problems. However, when used by general consumers for DIY purposes, there is a risk of injury from getting one's fingers caught in the coil spring, which could lead to an accident other than contact with the drill member. For this reason, manual drilling tools that are often used by general consumers have a structure in which the coil spring is enclosed within the handle, as in Patent Document 1.

The specific structure of a conventional manual drilling tool, as described in Patent Document 1, is such that a cylindrical guide member is inserted coaxially into the tip side of a handle member that is hollow inside and has an open tip, allowing it to move axially. The drill member that fits between the handle member and the guide member has its rear end fixed to the rear end of the handle member and is set to a length that allows its tip to fit inside the guide member when the guide member is in the forward position. The tip of a coil spring that fits inside the handle member and fits around the drill member comes into contact with the rear end of the guide member, giving the guide member elasticity to move toward the tip side, and the forward position of the guide member is restricted by a pair of retention mechanisms provided at the tip side position inside the handle member and at the rear end of the guide member.

When drilling with this type of manual drilling tool, the handle member is gripped and the tip of the guide member is abutted against the corrugated building material, and the drill member is advanced and rotated via the handle member relative to the fixed guide member to perform the drilling operation. In order to advance and rotate the drill member relative to the fixed guide member during drilling, it is necessary to secure a cylindrical space between the inner surface of the guide member and the outer surface of the drill member to prevent them from rotating together. As both ends of this cylindrical space are open, the opening at the rear end communicates with the internal space in which the coil spring of the handle member is housed.

When drilling corrugated building materials using the above-mentioned manual drilling tool, cutting with the drill bit generates chips of the corrugated building material, which are stored by entering the cylindrical space. However, if the amount of chips increases as the drilling work continues, the chips in the cylindrical space enter the internal space of the handle member that communicates with the cylindrical space, and as the chips accumulate in this internal space, they become caught between the coil springs that fit inside the handle member, causing problems with the expansion and contraction of the coil springs and hindering the drilling work.

In conventional manual drilling tools such as those in Patent Document 1, one possible way to prevent problems caused by chips getting caught in the coil spring is to increase the width of the cylindrical space by increasing the inner diameter of the guide member, so that the chips will naturally fall from the opening at the tip of the guide member. However, this is not desirable as it increases the diameter and weight of the entire manual drilling tool. In addition, even if the inner diameter of the guide member is increased, the relative axial movement of the drill member and guide member that occurs with each drilling operation causes chips in the chip discharge groove provided in the drill member and chips in contact with the inner surface of the guide member or the outer surface of the drill member to rise up and enter the internal space of the handle member, so it is not possible to completely prevent chips getting caught in the coil spring.

Design Registration No. 1271721 JP 2011-224722 A Japanese Utility Model Application Publication No. 3-107184 Japanese Utility Model Application Publication No. 54-112677 Japanese Utility Model Application Publication No. 52-17991 Japanese Utility Model Application Publication No. 52-41085

The object of this invention is to provide a manual drilling tool that, when drilling holes into the top surface of the convex portion of a corrugated building material, fully protects the operator's body from the drill bit and the expanding and contracting coil spring, prevents chips generated during drilling from entering and accumulating inside the coil spring in the handle, and allows anyone to perform drilling operations accurately, safely, and continuously without the need for skill.

In order to solve the above problems, the present invention provides a manual drilling tool for drilling through holes in the top surfaces of the protruding parts of the corrugated building material, the manual drilling tool comprising a handle member formed in a hollow cylindrical shape with an open tip, a cylindrical guide member, a retaining mechanism, an awl member, and a coil spring,
The guide member is cylindrical with both ends open, and has a seat at its tip to be attached to the top surface of the protruding portion of the corrugated building material. By inserting the guide member from the tip to the rear end into the handle member, the guide member is fitted and held coaxially with the handle member so that the tip side protrudes a predetermined length from the tip of the handle member, and the guide member can move axially and rotate about the axis relative to the handle member.
the retaining mechanism is formed so that the inside of the tip side of the handle member and the rear end side of the guide member engage with each other with the tip side of the guide member protruding a predetermined length from the tip of the handle member, and hold the guide member in a retaining manner against the tip side of the handle member; the awl member has a cutting edge at its tip, is accommodated within the handle member and the guide member in a coaxial arrangement with the handle member and the guide member, is fixed to the handle member so as to move integrally with the handle member, and has an overall length such that when the relationship between the handle member and the guide member is in an extended state, the cutting edge at the tip is recessed into the guide member, and when the relationship between the handle member and the guide member is in a contracted state, the cutting edge side at the tip protrudes a predetermined length from the tip of the guide member;
The coil spring is accommodated in a contracted state inside the handle member, and presses the rear end of the guide member to urge the guide member toward a forward position where a retaining mechanism engages with the guide member.
A chip sealing member is disposed inside the handle member between the rear end face of the guide member and the end of the coil spring.

The handle member may be formed by combining the handle member main body, which is formed in a hollow cylindrical shape with an open tip, with a holding cylinder that is coaxially connected to the tip of the handle member main body so as to extend from the tip and is fitted onto the guide member, and the anti-slip mechanism may be configured to be connected by a step provided on the inner circumference of the holding cylinder near the tip and a protrusion provided on the outer circumference of the rear end of the guide member.

Furthermore, the guide member can be configured to be formed using a transparent hard material.

The sealing member can also be configured to be a ring-shaped disk that fits inside the handle member to allow axial movement and rotation, has a larger diameter than the outer diameter of the guide member and the outer diameter of the coil spring, and has an inner diameter that fits rotatably around the cone member.

The drill member is provided with a chip discharge groove that extends from the cutting edge at the tip to a position midway in the axial direction toward the rear end, and the position of the sealing member relative to the chip discharge groove is set so that it is located closer to the rear end of the drill member than the rear end of the chip discharge groove.

The chip discharge groove can be configured so that its entire length fits within the guide member when the guide member is in the forward position relative to the handle member where the anti-slip mechanism engages.

With the manual drilling tool of this invention, the drill bit is enclosed in the handle and guide members when not in use and is not exposed except when drilling holes. The coil spring fitted around the drill bit is stored inside the handle in a contracted state and is not exposed at all times. This prevents an unskilled worker from accidentally touching the drill bit or pinching their fingers in the coil spring that expands and contracts when drilling holes, preventing injury. While maintaining the advantages of a manual drilling tool, a sealing member is interposed between the guide and coil spring, which prevents chips from entering and accumulating inside the handle in which the coil spring is housed when drilling holes continuously. This prevents malfunctions caused by chips impeding the expansion and contraction of the coil spring.

Furthermore, by forming the sealing member into a ring-shaped disk whose outer diameter is larger than the outer diameter of the guide member and the outer diameter of the coil spring and whose inner diameter fits rotatably around the drill member, and by interposing this between the rear end face of the guide member and the end of the coil spring, it is possible to block the communication between the cylindrical space of the guide member and the inside of the handle member, and to prevent fine chips from being rolled up and passing through the inside of the guide member and entering the part enclosed by the coil spring when drilling.

Furthermore, by interposing the sealing member between the rear end of the guide member and the end of the coil spring, the guide member and the coil spring are not in direct contact with each other, which also makes it possible to prevent the coil spring from getting caught in the anti-detachment piece provided at the rear end of the guide member, preventing normal operation.

Furthermore, when drilling is continued continuously, most of the chips are discharged from the tip side of the guide member, but some of them accumulate in the chip discharge groove of the drill member and gradually accumulate and rise from the pointed tip of the drill member toward the handle part. However, by setting the overall length of the chip discharge groove to a length that fits within the guide member when the guide member is in the forward position relative to the handle member where the anti-slip mechanism engages, the fitting part of the drill member with the sealing member always becomes a circular shaft part, maintaining the sealing function, and the chip discharge groove does not communicate with the part enclosed by the coil spring. Therefore, chips that have accumulated in the chip discharge groove can be prevented from entering the part enclosed by the coil spring, further enhancing the effectiveness of the sealing member.

1A is a front view showing a manual drilling tool according to an embodiment of the present invention, and FIG. FIG. 2 is a vertical sectional side view taken along the arrow aa in FIG. 4A is a plan view of a sealing member, and FIG. 4B is a longitudinal sectional front view of the same. FIG. 2 is a front view showing the cone member according to the embodiment of the present invention. FIG. 1 is a front view showing a coil spring according to an embodiment of the present invention. 1A is a front view showing a guide member according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view of the guide member of FIG. 6 taken along the line cc. FIG. 2 is a front view showing the retaining member according to the embodiment of the present invention. 9 is a cross-sectional view of the retaining mechanism of FIG. 8 taken along the line dd. FIG. 2 is a front view showing a handle member and an awl member fixed thereto according to an embodiment of the present invention. 11 is a cross-sectional view of the handle member of FIG. 10 taken along the line ee. 1A is a front view showing a state in which a hole is drilled using the manual drilling tool of the present invention, and FIG.

As shown in Figures 1, 2, and 12, the manual drilling tool 1 of this invention is used to drill a through hole 3a in the top surface 3 of the convex portion of a corrugated building material 2, and is composed of a handle member 4, a cylindrical guide member 5, an drill member 6, and a coil spring 7.

The handle member 4 is a combination of a handle body 4a formed in a hollow cylindrical shape with an open tip, and a holding cylinder 8 connected coaxially to the tip of the handle body 4a as an extension of the handle body 4a. The guide member 5 is cylindrical with both ends open, and has a corrugated joint seat 9 at its tip for connecting to the convex top surface 3 of the corrugated building material 2. By inserting the rear end into the holding cylinder 8, the holding cylinder 8 is fitted and held in a coaxial state so that the tip protrudes a predetermined length from the tip 12 of the holding cylinder 8, allowing it to move axially and rotate relative to the holding cylinder 8.

The mating portion between the guide member 5 and the retaining cylinder 8 is made up of a step 10a formed by a protrusion on the outer periphery of the rear end of the guide member 5 and a step 10b on the inner periphery of the tip end of the retaining cylinder 8, and they engage with each other with the guide member 5 protruding a predetermined length from the tip of the retaining cylinder 8, forming a slip-out prevention mechanism 10 that holds the guide member 5 in the forward position on the tip end in a non-slip manner.

The awl member 6 has a cutting edge 6a at its tip, and is arranged coaxially with the handle member 4 and the guide member 5 inside the handle member 4 and within the guide member 5. Its rear end is fixed to the handle body 4a so that it moves integrally with the handle member 4. Its overall length is set so that the cutting edge 6a of the awl member 7 is recessed into the guide member 5 close to its tip when the relationship between the handle member 4 and the guide member 5 is in an extended state as shown in Figure 2.

The coil spring 7 fits around the drill member 6 and is contracted within the internal space 4b that is formed continuously from inside the handle body 4a of the handle member 4 to inside the retaining cylinder 8. Its tip is pressed against the chip sealing member 11 interposed between it and the rear end face of the guide member 5, and presses the rear end of the guide member 5 forward in the axial direction via this sealing member 11, urging the guide member 5 to move elastically toward the forward position where the anti-slip mechanism 10 engages with the guide member 5.

As shown in Figures 2 and 3, the sealing member 11 is formed as a thin ring-shaped disk with an inner diameter that fits exactly around the parallel shaft portion of the drill member 6 and allows relative axial movement with the drill member 6, and an outer diameter that is approximately the same as the rear end face of the guide member 5. It moves axially together with the guide member 5 while being constantly pressed against the rear end face of the guide member 5 by the pressure of the coil spring 7, and closes the opening at the rear end side of the cylindrical space 5a formed between the inner circumference of the guide member 5 and the drill member 6, thereby blocking communication between the internal space 4b of the handle member 4 and the cylindrical space 5a of the guide member 5.

In this way, closing the opening at the rear end of the guide member 5 with the sealing member 11 can prevent chips generated in the guide member 5 during drilling with the drill bit 6 from entering the internal space 4b of the handle member 4, and can prevent the coil spring 7 contained in this internal space 4b from being hindered in expanding and contracting due to chips.

The parallel shaft portion of the drill member 6 is divided into a portion 6b used for drilling and a portion 6c onto which the coil spring 7 fits in an expanded state. The diameter of the portion 6c onto which the coil spring 7 fits in an expanded state is larger than the diameter of the portion 6b used for drilling, and the inner diameter 11a of the sealing member 11 and the diameter of the portion 6c onto which the coil spring 7 of the drill member 6 fits are set as nearly as possible to be the same.

More specifically, it is desirable that the inner diameter 11a of the sealing member 11 is set to be larger than the diameter of the portion 6c of the cone member 6 on which the coil spring 7 fits, within a range of 1 mm in difference in diameter.

When drilling holes in a corrugated building material 2 using a manual drilling tool 1, the size of the chips is larger than when drilling holes using an electric drilling tool because the rotation speed of the drill member 6 is slower. Therefore, if the gap between the diameter of the portion 6c where the coil spring 7 of the drill member 6 fits in an extended state and the inner diameter 11a of the sealing member 11 is about 1 mm, it is possible to sufficiently prevent the chips from passing through the gap between the sealing member 11 and the drill member 6 and penetrating into the portion enclosed by the coil spring 7.

In addition, by making the sealing member 11 into a flat steel plate, it is possible to prevent it from rubbing against the guide member 5 and becoming worn, or from being pierced by the end of the coil spring 7, thereby suppressing the occurrence of malfunctions. When the sealing member 11 is made of steel in this way, it is desirable to set its thickness to 1 mm or more so that it will not deform even if it comes into uneven contact with the guide member 5 during use and a concentrated force is applied to one part.

If the sealing member 11 is made of steel, it can be sufficiently effective against deformation as it is, but to prevent cutting chips from sticking to the surface of the sealing member 11 due to static electricity or oil adhesion, which would hinder the smooth discharge of the cutting chips, it is preferable to take anti-fouling measures, such as applying a chromate treatment to the surface.

The drill bit 6 is configured so that when the handle member 4 and guide member 5 are in a contracted state, the cutting edge 6a at the tip of the drill bit 6 protrudes a predetermined length from the tip of the guide member 5, and it is desirable for the protruding length to be in the range of 13 mm to 30 mm, taking into consideration the shape of the corrugated building material 2, and the length of the tapered portion that forms the cutting edge 6a at the tip of the drill bit 6 is set to 13 mm or less.

By setting the length of the cutting edge 6a of the drill bit 7 to 13 mm or less, even if the corrugated building material 2 has a small wave height and the base material 12 is made of steel or other material that cannot be drilled, drilling into the top surface 3 of the convex portion of the corrugated building material 2 is completed before the tip of the cutting edge 6a comes into contact with the base material 12, and the tip of the drill bit 6 is not damaged.

Incidentally, if the length of the cutting edge 6a of the drill member 6 is set to 13 mm or more, when attaching the corrugated building material 2 to a base material 12 such as steel that cannot be drilled with the manual drilling tool 1, when drilling into the corrugated building material 2 with a small wave height, as the drill member 6 drills and advances from the top surface 3 of the convex portion toward the base material 12, the cutting edge 6a of the drill member 6 comes into contact with the base material 12, causing the drilling to be interrupted midway along the cutting edge 6a, and it becomes impossible to drill into the corrugated building material 2 until it reaches the parallel shaft portion 6b of the drill member 6, which has the optimal drilling diameter, beyond the cutting edge 6a.

In that case, the corrugated building material 2 cannot be placed on top of the base 12 on which it is originally intended to be installed, and drilling work cannot be performed in a position other than the base 12, requiring specialized skills such as accurate marking, and users who are not normally involved in construction, such as do-it-yourselfers, will not be able to drill in the correct position.

Furthermore, if the length of the drill member 6 were to protrude beyond the tip of the guide member 5 by more than 30 mm, the overall length of the manual drilling tool 1 would be too long to handle manually, reducing workability, and the operating range of the guide member 5 would become too large, significantly increasing the frequency of malfunctions.

The drill member 6 is provided with a chip discharge groove 6d for discharging chips that have accumulated at the cutting edge 6a, which extends from the cutting edge 6a at the tip 13 to a position midway in the axial direction toward the rear end. The chip discharge groove 6d is set to a length that allows its entire length to fit within the guide member 5 when the guide member 5 is in the forward position relative to the handle member 4 where the retaining mechanism 10 engages.

The chip discharge groove 6d is positioned so that it does not extend beyond the position of the sealing member 11 toward the rear end, thereby preventing chips generated during drilling from passing through the chip discharge groove 6d and passing through the gap between the drill member 6 and the sealing member 11 to enter the side of the handle member 4 where the coil spring 7 is enclosed.

Next, the anti-slip mechanism 10 is formed by a step 10b provided on the inner circumference of the retaining cylinder 8 near the tip, and a protruding step 10a provided on the outer circumference of the rear end side of the guide member 5. If the step 10b and step 10a are provided in a continuous ring shape without any gaps, even if the retaining cylinder 8 is molded from resin for the purpose of improving productivity, the effect can be fully maintained even if the step 10b and step 10a become worn and weakened, losing tension.

The guide member 5 is formed using a transparent hard material, which may be a resin material such as ABS resin or polycarbonate resin, and preferably polycarbonate resin is used to obtain better weather resistance and transparency.

When the above-mentioned resin is used as the material for the guide member 5, it is preferable to provide a peripheral wall thickness of 1.5 mm or more to provide sufficient strength. However, in the above-mentioned slip-out prevention mechanism 10, when combining the step portion 10b provided on the inner periphery tip side of the retaining cylinder 8 with the step portion 10a of the protrusion provided on the outer periphery of the rear end side of the guide member 5, the guide member 5 is too hard and a large force is required to combine them, which not only reduces the burden and efficiency of the worker but also causes damage to the retaining cylinder 8 and the guide member 5. In order to prevent this problem, as shown in Figures 6 and 7, multiple notches 13 are provided from the rear end side of the guide member 5 to the tip 9, making it possible to perform the assembly work efficiently.

Reference Signs List 1 Manual drilling tool 2 Corrugated building material 3 Convex top surface 3a Through hole 4 Handle member 4a Handle member body 4b Internal space 5 Guide member 5a Cylindrical space 6 Drill member 6a Cutting edge 6b Part used for drilling 6c Part fitted onto coil spring 6d Chip discharge groove 7 Coil spring 8 Holding member 9 Joint seat 10 Anti-slip mechanism 10a Step 10b Step 11 Sealing member 11a Inner diameter 12 Base material 13 Notch

Claims (6)

A manual drilling tool for drilling through holes in the top surface of a protruding portion of a corrugated building material, the tool comprising a handle member formed in a hollow cylindrical shape with an open tip, a cylindrical guide member, a retaining mechanism, an awl member, and a coil spring;
The guide member is cylindrical with both ends open, and has a seat at its tip for connection to the top surface of the protruding portion of the corrugated building material. By inserting the rear end into the handle member, the guide member is fitted and held coaxially with the handle member so that the tip protrudes a predetermined length from the tip of the handle member, and the guide member can move axially and rotate about the axis relative to the handle member.
the retaining mechanism is formed so that the inside of the tip end side of the handle member and the rear end side of the guide member are engaged with each other in a state in which the tip end side of the guide member protrudes a predetermined length from the tip of the handle member, and the guide member is held in a retaining state relative to the tip end side of the handle member;
the awl member has a cutting edge at its tip, is fitted coaxially with the handle member and the guide member throughout the handle member and within the guide member, and is fixed to the handle member so as to move integrally with the handle member, and has an overall length such that when the relationship between the handle member and the guide member is in an extended state, the cutting edge at the tip is recessed into the guide member, and when the relationship between the handle member and the guide member is in a contracted state, the cutting edge side at the tip protrudes a predetermined distance from the tip of the guide member;
The coil spring is accommodated in a contracted state inside the handle member and presses the rear end of the guide member, thereby urging the guide member to move elastically toward a forward position where the retaining mechanism engages with the guide member.
A manual drilling tool, characterized in that a sealing member for sealing chips is interposed inside the handle member between a rear end surface of the guide member and an end of the coil spring. The manual drilling tool according to claim 1, characterized in that the handle member is a combination of a handle body formed in a hollow cylindrical shape with an open tip, and a holding cylinder that is coaxially connected to the tip of the handle body so as to extend from the tip and fits onto the guide member, and the retaining mechanism is formed by a step provided on the inner circumference of the holding cylinder near the tip and a protrusion provided on the outer circumference of the rear end of the guide member. The manual drilling tool according to claim 1 or 2, characterized in that the guide member is made of a transparent hard material. The manual drilling tool according to any one of claims 1 to 3, characterized in that the sealing member is formed as a ring-shaped disk that fits inside the handle member to be able to move axially and rotate, has a larger diameter than the outer diameter of the guide member and the outer diameter of the coil spring, and has an inner diameter that fits rotatably with the drill member. The manual drilling tool according to any one of claims 1 to 4, characterized in that the drill member has a chip discharge groove extending from the cutting edge at the tip to a position midway in the axial direction toward the rear end, and the position of the sealing member relative to the chip discharge groove of the drill member is set to be located closer to the rear end of the drill member than the rear end of the chip discharge groove. The manual drilling tool according to claim 5, characterized in that the chip discharge groove provided in the drill member is set to a length such that its entire length fits within the guide member when the guide member is in the forward position relative to the handle member where the retaining mechanism engages.

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