JP5898159B2 - Pickaxe - Google Patents

Description

  The present invention relates to a pickaxe used for digging up a hard ground.

  The pickaxe is configured such that the beak-shaped portion of the crane protrudes from one end of the handle. Usually, the beak-shaped portion of the pickaxe has a shape obtained by gently bending an elongated quadrangular pyramid shape.

  By the way, in general, excavation work of earth and sand by pickaxe is performed by piercing the beak-shaped part into the earth and sanding the earth and sand with the tip of the beak-shaped part.

  However, a portion of the conventional pickaxe-shaped beak-shaped portion facing the handle side of the handle has a flat shape. For this reason, when the earth and sand are squeezed by the tip part of the beak-shaped part, the flat part becomes a resistance, so that it is difficult to smoothly perform the earth and sand excavation work and the like.

  Therefore, an object of the present invention is to enable smooth excavation work of earth and sand by pickaxe.

In order to solve the above-mentioned problem, the first aspect is a pickaxe for excavating earth and sand, including a rod-shaped handle and a beak-like portion protruding from the tip of the handle toward one side thereof, The beak-shaped portion is formed in a shape that gradually narrows toward the distal end side thereof, and the portion of the beak-shaped portion that faces the proximal end portion of the handle is gradually thinned toward the proximal end side of the handle. And an excavation part formed into a shape. In addition, all the portions in the longitudinal direction of the beak-like portions have a triangular cross-section that gradually becomes thinner toward the proximal end side of the handle as a whole .

  A 2nd aspect is the pickaxe which concerns on a 1st aspect, Comprising: The said excavation part is formed in the shape which protrudes only in the said beak-like part from the front-end | tip part of the said handle | pattern.

The first aspect, in a state of being fixed across the base end portion of the beak-shaped portion at both ends, further comprising a fixing member fixed to surround its distal end to the distal end of the handle.

In the first aspect, the beak-like portion is formed in a state in which positioning recesses are formed on both sides of the base end portion of the beak-like portion, and at least a part of both end portions of the fixing member are fitted in the positioning recess. It is fixed to the base end of the.

Further, the first aspect, before Symbol beak-like portion proximal end sac Chi before Symbol positioning recess formed part of, what is formed so as to gradually width increases with the increasing toward the said handle side It is.

A third aspect is a pickaxe according to the first or second aspect, wherein the pickle is disposed so as to pass through both end portions of the fixing member and a base end portion of the beak-like portion between the fixing members. A fastening member for maintaining a state in which both end portions of the member are fastened and fixed to the base end portion of the beak-like portion is further provided.

A fourth aspect is a pickaxe according to any one of the first to third aspects, wherein both end portions of the fixing member are provided between both end portions of the fixing member and a base end portion of the beak-like portion. The both ends of the fixing member are fixed by sandwiching the base end of the beak-like portion in a state where an intervening substance that can be deformed by tightening is interposed.

  According to the pickaxe according to the first aspect, the beak-like portion of the excavation part is formed in a shape that gradually narrows toward the tip side thereof, so that the beak-like portion can be easily pierced with hard earth and sand. it can. In addition, since the portion of the beak-shaped portion facing the base end of the handle is formed in a shape that becomes thinner gradually toward the base end of the handle, the beak-shaped portion separates the sand and the like into the earth and sand Can move easily through. As a result, excavation work of earth and sand by pickaxe can be performed smoothly.

  According to the second aspect, the pickaxe can be reduced in weight, and excavation work using the pickaxe can be performed more easily.

According to the first aspect, the beak-like portion can be easily fixed to the tip portion of the handle.

According to the 1st aspect, a fixing member can be reliably fixed to a fixed position by a beak-like part.

According to a first aspect, the beak-like portion proximal end sac Chi before Symbol positioning recess formed part of, since it is formed so as to gradually width increases with the increasing toward the handle side, the fixed It is difficult to remove the beak-like portion from between the members.

According to the third aspect, the fixing member can be reliably fixed to the beak-like portion by the fastening member.

According to the fourth aspect, since the intervening substance is interposed between the both end portions of the fixing member and the base end portion of the beak-like portion, the fixing member and the beak-like portion can be more reliably connected. Can be fixed without rattling.

It is a side view showing a pickaxe according to an embodiment. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is sectional drawing which shows the modification of an excavation part. It is sectional drawing which shows the other modification of an excavation part. It is sectional drawing which shows the other modification of an excavation part. It is the elements on larger scale of FIG. It is a partial expanded bottom view of a pickaxe. It is explanatory drawing which shows the fixing operation | work by a fixing member. It is explanatory drawing which shows the fixing operation | work by a fixing member. It is explanatory drawing which shows the example of excavation work by a pickaxe. It is explanatory drawing in the XIV-XIV line | wire of FIG. It is a partial side view which shows the pickaxe which concerns on a modification. It is a partial expanded bottom view of the pickaxe same as the above.

  Hereinafter, the pickaxe according to the embodiment will be described. 1 is a side view showing the pickaxe 20, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. FIG. 5 is a sectional view taken along line IV, and FIG. 5 is a sectional view taken along line VV in FIG. 9 is a partially enlarged view of FIG. 1, FIG. 10 is a partially enlarged bottom view of the pickaxe 20, and FIGS. 11 and 12 fix the beak-like portion 42 to the distal end portion of the handle 30 by the fixing member 50. It is explanatory drawing which shows an operation | work.

  The pickaxe 20 is for excavating earth and sand, and includes a handle 30 and an excavation part 40. The pickaxe 20 has a size and weight suitable for excavating earth and sand. Of course, the pickaxe may be used not only for excavating earth and sand but also for crushing rocks, for example.

  The handle 30 is formed in a rod shape. Here, the handle 30 is a wooden stick. The length of the handle 30 is not particularly limited, but is set to a length dimension suitable for grasping and swinging the handle 30 with both hands, for example, 70 to 110 cm, preferably about 80 cm to 110 cm. Yes. The cross-sectional shape in the direction orthogonal to the longitudinal direction of the handle 30 is preferably elliptical or circular so that it can be easily grasped by hand. Here, the cross-sectional shape of the handle 30 is formed in an elliptical shape. The excavation part 40 is attached to the front-end | tip part (lower end part of FIG. 1) of this handle 30.

  The excavation part 40 includes a beak-like portion 42 that protrudes from a tip part of the handle 30 toward one side orthogonal to the extending direction of the handle 30. Here, the beak-like portion 42 is formed in a long shape that draws a gentle arc. The base end portion of the beak-like portion 42 is attached and fixed to the distal end portion of the handle 30 in a posture in which the convex portion due to the curve is directed toward the distal end side of the handle 30.

  The beak-like portion 42 is formed in a shape in which the width dimension gradually decreases toward the tip side. The width dimension of the beak-like portion 42 is the dimension of the beak-like portion 42 in the direction orthogonal to both the extending direction of the handle 30 and the extending direction of the beak-like portion 42. As a result, the beak-like portion 42 can be easily pierced into the ground or the like.

  Further, the long edge portion of the beak-like portion 42 on the side facing the base end side of the handle 30 is formed in the shape portion 44 whose width dimension is gradually reduced toward the base end side of the handle 30. The shape portion 44 can also be regarded as a bladed portion. Here, the said shape part 44 which faces the base end side of the handle 30 among the beak-like parts 42 is formed in a double-edged shape.

  Here, in the beak-like portion 42, the portion 45 other than the shape portion 44 is also formed in a shape in which the width dimension is gradually reduced toward the proximal end side of the handle 30, but this portion 45 has the same shape. You may form in width.

  In the beak-like portion 42, the length of the shape portion 44 in the extending direction of the handle 30 is set so as to gradually decrease from the proximal end portion to the distal end side of the beak-like portion 42. Further, even when viewed as the beak-like portion 42 as a whole, the length of the beak-like portion 42 in the extending direction of the handle 30 is set so as to gradually decrease from the base end side to the tip end side of the beak-like portion 42, Even if attention is paid to the portion 45 other than the shape portion 44 in the beak-shaped portion 42, the length of the portion 45 in the extending direction of the handle 30 increases from the proximal end side to the distal end side of the beak-shaped portion 42. It is set to gradually decrease. As a result, the beak-like portion 42 can be easily pierced with respect to earth and sand, and the beak-like portion 42 is reinforced by the portion 45 until it reaches the distal end side, so that it is not easily chipped. It has been finished.

  Further, the long edge portion of the beak-like portion 42 on the side facing the tip side of the handle 30 is formed on a smooth and long surface 46 facing the tip side of the handle 30. The dimension of the maximum width portion of the surface 46 is, for example, 1 cm to 3 cm. Thereby, the beak-like portion 42 can secure a certain width preferable for excavating the earth and sand.

  The beak-like portion 42 is made of metal or the like, and is preferably made of manganese steel. The length of the beak-like portion 42 is, for example, 20 cm to 50 cm, and preferably 30 cm to 40 cm.

  In this embodiment, the excavation part 40 protrudes from the front end part of the handle 30 to one side of the handle 30 only at the beak-like portion 42. That is, when the pickaxe 20 is viewed as a whole, the beak-like portion 42 protrudes only one side from the tip of the handle 30, and the tip of the handle 30 is opposite to the beak-like portion 42. Is not protruding. However, a portion protruding from the opposite side of the beak-like portion 42 may be formed at the tip portion of the handle 30.

  A modification of the beak-like portion 42 will be described with reference to FIGS. 6 to 8 each show a cross section of the beak-like portion at the same position as FIG. As in the modification shown in FIG. 6, both side portions of the beak-like portion 42 </ b> B corresponding to the beak-like portion 42 facing the tip side of the handle 30 may be rounded. Further, as in the modification shown in FIG. 7, the side edges of the beak-like portion 42 </ b> C corresponding to the beak-like portion 42 are long edge portions on the side of the beak-like portion 42 </ b> C facing the base end side of the handle 30. The shape which inclines with the same inclined shape toward the long portion facing the tip side of the handle 30, that is, the vertical cross-sectional shape of the beak-like portion 42 </ b> C forms a triangular shape (here, an acute angle isosceles triangular shape). It may be formed. In addition, like the beak-like portion 42D of the modification shown in FIG. 8, in the modification shown in FIG. 7, both sides facing the tip side of the handle 30 may be processed to be rounded.

  The beak-like portion 42 is fixed to the distal end portion of the handle 30 by the following configuration using the fixing member 50.

  That is, a pair of positioning recesses 48 are formed on both sides of the base end portion of the beak-like portion 42. The positioning recess 48 includes a first surface 48a facing the base end side of the beak-shaped portion 42, and a second surface inclined outward from the inner side of the first surface 48a toward the base end portion of the beak-shaped portion 42. Surface 48b. The dimension of the first surface 48a in the depth direction of the positioning recess 48 is set to be the same as the thickness of the end portion of the fixing member 50 described later. The second surface 48b is formed so as to reach the side of the base end portion of the beak-like portion 42 from the back side of the first surface 48a. As a result, the portion of the base end portion of the beak-like portion 42 in which the positioning recesses 48 are formed on both sides is gradually increased in width toward the base end portion of the beak-like portion 42, that is, the handle 30 side. Is formed.

  Here, a pair of positioning recesses 48 are formed on both sides of the base end portion of the beak-like portion 42, but the positioning recesses 48 are formed only on one of both side portions of the base end portion of the beak-like portion 42. However, it is not essential that such a positioning recess 48 is formed.

  Moreover, the penetration recessed part 49 penetrated in the both sides is formed in the base end part of the beak-like part 42 (refer FIG.11 and FIG.12). Here, two penetrating recesses 49 are formed in the base end portion of the beak-like portion 42 in the portion where the pair of positioning recesses 48 are formed with a space along the extending direction of the handle 30. Here, the through recess 49 is formed so as to partially open to the outer periphery of the beak-like portion 42, but it may have a hole shape in which the entire periphery is surrounded. The through recess 49 is formed in a size that allows insertion of a screw portion described later.

  The beak-like portion 42 is fixed to the distal end portion of the handle 30 using a fixing member 50. The fixing member 50 is a member formed by bending a metal plate or the like, and a handle fixing portion 52 that surrounds the distal end portion of the handle 30 and an extending portion that extends at both ends of the handle fixing portion 52. 54.

  The handle fixing portion 52 is formed in a shape bent according to the outer peripheral shape of the tip end portion of the handle 30, here, a shape in which the U-shaped tip end portion is narrowed, that is, a horseshoe shape.

  The extending portion 54 is formed in a plate shape and extends from the distal end portion of the handle fixing portion 52. Further, the dimension between the pair of extending portions 54 is gradually narrowed toward the distal end side. With the handle fixing portion 52 surrounding the tip end portion of the handle fixing portion 52, the extension length of the pair of extension portions 54 is such that the tip end portion of the pair of extension portions 54 is the first surface of the positioning recess 48. It is set so as to reach 48a.

  In addition, a penetrating recess 55 is formed in the extended portion 54 (see FIGS. 11 and 12). The through recess 55 is formed at a position corresponding to the through recess 49 in a state where the extending portion 54 is overlapped with the side portion of the beak-like portion 42. In other words, the through recesses 55 of the pair of extending portions 54 are disposed on both side opening extensions of the through recess 49 formed in the base end portion of the beak-like portion 42.

  The handle fixing portion 52 surrounds the tip end portion of the handle 30 with the tip end portion of the handle 30 in a state where the base end portion of the beak-like portion 42 is sandwiched and fixed by the pair of extending portions 54 that are both ends of the fixing member 50. It is assumed that it is in a state. In this state, it is preferable that the inner peripheral surface of the handle fixing portion 52 is as close as possible to the outer peripheral surface of the tip portion of the handle 30.

  In this state, the bolt 70 as a fastening member is disposed so as to penetrate the through recess 55 of the pair of extending portions 54 and the through recess 49 of the base end portion of the beak-like portion 42 that are both ends of the fixing member 50. The nut 72 is screwed and fastened to the tip of the bolt 70 protruding from the outer surface of the one extending portion 54. As a result, the pair of extending portions 54 of the fixing member 50 are clamped and fixed by sandwiching the base end portion of the beak-like portion 42, and the clamped and fixed state is maintained. In addition, after the bolt 70 and the nut 72 are tightened, it is preferable that the head portion of the bolt 70 and the nut 72 are crushed, shaved, or the like to crush the polygonal shape. Moreover, it is preferable to crush a screw thread etc. and to suppress the loosening of the bolt 70 and the nut 72. Further, as the fastening member, a rivet or the like in addition to the bolt 70 and the nut 72 may be used.

  In the tightening and fixing state, the pair of extending portions 54 of the fixing member 50 are in a state of being fitted into the positioning recess 48. More specifically, the distal ends of the pair of extending portions 54 abut on the first surface 48 a of the positioning recess 48, and the inward surfaces of the pair of extending portions 54 are the second surfaces 48 b of the pair of positioning recesses 48. It will be in the state of facing. For this reason, the beak-like portion 42 is more reliably fixed in a state where rattling is suppressed at a certain position. Further, even if the beak-like portion 42 is about to come out to the distal end side, the pair of extending portions 54 sandwich the portion that is the base end portion of the beak-like portion 42 and gradually increases in thickness toward the base end portion. Therefore, such omission is more reliably suppressed.

  In addition, here, in a state where an intermediary substance that can be deformed by tightening the pair of extending portions 54 is interposed between the pair of extending portions 54 of the fixing member 50 and the base end portion of the beak-like portion 42, A pair of extending portions 54 are fixed with the proximal end portion of the beak-like portion 42 sandwiched therebetween. Here, a plate-like resin, particularly a plate-like resin is used as the intervening substance. When the base end portion of the beak-like portion 42 is sandwiched between the pair of extending portions 54, as shown in FIGS. 11 and 12, the plate-like resin 80 is placed on both side surfaces of the base end portion of the beak-like portion 42. And a pair of extending portions 54. In this state, the nut 72 is screwed and fastened to the bolt 70 so that the base end portion of the beak-like portion 42 is sandwiched between the pair of extending portions 54. Then, the plate-like resin 80 is deformed so as to fill a gap between the both side surfaces of the base end portion of the beak-like portion 42 and the pair of extending portions 54 by a pinching force due to screwing fastening, and the filling material is interposed therebetween. It will intervene as 82. Thereby, rattling between the base end portion of the beak-like portion 42 and the pair of extending portions 54 can be more reliably suppressed. As an intervening substance, a deformable metal such as aluminum, wood, or the like may be used in addition to a resin.

  Also, here, after fixing the beak-like portion 42 to the tip of the handle 30 using the fixing member 50, the wedge 86 is driven into the tip of the handle 30. The wedge 86 increases the outer diameter of the distal end portion of the handle 30 and prevents the fixing member 50 from coming off from the distal end portion of the handle 30.

  13 and 14 are explanatory views showing a state in which the earth and sand 100 are excavated using the pickaxe 20.

  For example, when the operator grasps the handle 30 with both hands, swings the pickaxe 20, and pierces the tip of the beak-like portion 42 into the earth and sand 100, the state shown in FIG. In addition, since the beak-like portion 42 is formed in a shape that becomes gradually narrower toward the tip end side thereof, the beak-like portion 42 can be easily pierced with hard earth and sand.

  In this state, when the operator moves the handle 30 to dig up or crush the earth and sand 100, a portion of the beak-like portion 42 facing the base end side of the handle 30 advances in the earth and sand 100. (See arrow P). At this time, when the earth and sand 100 hits the shape portion 44 of which the width dimension is gradually reduced toward the base end side of the handle 30 in the beak-like portion 42, the earth and sand 100 is in accordance with the inclined shape of the shape portion. It will be distributed to both sides (see arrow Q). That is, the beak-like portion 42 can advance through the earth and sand 100 by pressing the earth and sand 100 to both sides.

  For this reason, excavation work of earth and sand by the pickaxe 20 can be performed smoothly.

  Moreover, when the roots of plants and the like exist in the earth and sand 100, the beak-like portion 42 can cut or crush such roots. Also from this point, excavation work of the earth and sand 100 by the pickaxe 20 can be performed smoothly.

  In addition, the portion of the beak-shaped portion 42 facing the base end side of the handle 30 is formed into the shape portion 44 whose width dimension is gradually reduced toward the base end side of the handle 30, so that the beak-shaped portion 42 is light. Can be realized. Thereby, the pickaxe 20 becomes easy to handle. In addition, the excavation part 40 is formed in a shape that protrudes only from the tip part of the handle 30 at the beak-like part 42 and does not have a part that protrudes to the opposite side and is used for excavation. The weight can be reduced, and the pickaxe 20 can be easily handled.

  Further, the fixing member 50 is fixed so as to surround the distal end portion of the handle 30 in a state where the proximal end portion of the beak-like portion 42 is sandwiched and fixed by the pair of extending portions 54 at both end portions. Therefore, the beak-like portion 42 can be easily fixed to the tip portion of the handle 30.

  Further, since the fixing member 50 fixed so as to surround the handle 30 is a separate member from the beak-shaped portion 42, the beak-shaped portion 42 is made of manganese steel or the like in consideration of workability, durability, and the like. A hard material is used, and the fixing member 50 can be made of a material that can be easily bent or the like in consideration of mounting workability.

  Further, a positioning recess 48 is formed at the base end portion of the beak-like portion 42, and the extension portion 54 of the fixing member 50 is fixed to the base end portion of the beak-like portion 42 in a state where the extension portion 54 is fitted in the positioning recess 48. Therefore, the beak-like portion 42 can be more reliably fixed at a certain position.

  Further, the portion where the positioning recess 48 is formed in the base end portion of the beak-like portion 42 is formed so that the width gradually increases toward the handle 30 side. In a state where the base end portion of the beak-shaped portion 42 is sandwiched, the beak-shaped portion 42 is difficult to come off to the tip side.

  Further, since the pair of extending portions 54 of the fixing member 50 keeps the base end portion of the beak-like portion 42 fastened and fixed by the bolt 70 and the nut 72 as the fastening members, the fixing member 50 and the beak-like shape are maintained. The proximal end portion of the portion 42 can be more reliably fixed.

  Further, since the filling material 82 in which the resin or the like is deformed is interposed between the pair of extending portions 54 and the base end portion of the beak-like portion 42, the fixing member 50 and the beak-like portion 42 are further connected. It can be fixed in a state where rattling is reliably suppressed.

  In the above embodiment, the beak-like portion 42 has been described as being fixed to the tip portion of the handle 30 using the fixing member 50. However, the beak-like portion is fixed to the tip portion of the handle by other configurations. Also good.

  For example, in the modification shown in FIGS. 15 and 16, the annular fixing portion 150 into which the distal end portion of the handle 30 can be fitted is integrally formed at the base end portion of the beak-like portion 142 corresponding to the beak-like portion 42. Then, the wedge 86 is driven into the distal end portion of the handle 30 in a state where the distal end portion of the handle 30 is fitted into the annular fixing portion 150 so that the annular fixing portion 150 is not pulled out from the distal end portion of the handle 30. It has become.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

20 pickaxe 30 handle 40 excavation part 42, 142 beak-like part 48 positioning recess 49 penetrating recess 50 fixing member 52 handle fixing part 54 extension part 55 penetrating recess 70 bolt 72 nut 80 plate-like resin 82 filling

Claims (4)

A pickaxe for excavating earth and sand,
With a rod-shaped handle,
A beak-like portion that protrudes toward one side from the tip of the handle, and the beak-like portion is formed in a shape that gradually narrows toward the tip side, and the handle of the beak-like portion A portion of the side facing the base end of the excavation part formed in a shape that becomes thinner gradually toward the base end side of the handle,
With
All the portions in the longitudinal direction of the beak-shaped portion have a triangular cross-section that becomes thinner gradually toward the base end side of the handle as a whole ,
further,
In a state where both ends are fixed with the base end portion of the beak-shaped portion sandwiched therebetween, the fixing member is further fixed to the distal end portion of the handle so as to surround the distal end portion,
Positioning recesses are formed on both sides of the base end portion of the beak-shaped portion,
Of the base end portion of the beak-shaped portion, the portion where the positioning recess is formed is formed so that the width gradually increases toward the handle side,
The pickaxe fixed to the base end portion of the beak-like portion in a state where at least a part of both end portions of the fixing member is fitted in the positioning recess. The pickaxe according to claim 1,
The said excavation part is a pickaxe currently formed in the shape which protrudes only in the said beak-like part from the front-end | tip part of the said handle | pattern. The pickaxe according to claim 1 or 2,
The fixing member is disposed so as to pass through both end portions of the fixing member and the base end portion of the beak-like portion therebetween, and the both end portions of the fixing member maintain the state in which the base end portion of the beak-like portion is fastened and fixed. The pickaxe further provided with the fastening member to do. The pickaxe according to any one of claims 1 to 3,
The both ends of the fixing member are in the state where both ends of the fixing member are interposed between the both ends of the fixing member and the base end of the beak-like portion, with an intervening substance deformable by tightening the both ends of the fixing member interposed therebetween. A pickaxe that is fixed across the base end of the shaped part.

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