JP2008174893A - Cap body of cap for light work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap body of a cap for light work, which has a light weight and is capable of surely absorbing impact acting downward from above. <P>SOLUTION: A cap body 1 formed like a bowl and of a cap 3 for light work, has a first level difference 7 provided at an intermediate in the height direction of the cap body 1, and a second level difference 9 provided to form a convex with the top of the cap body 1 and the vicinity thereof on an outer surface 11 of the cap body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cap body for a light work hat, and more particularly to a cap body for a hat that is used in place of a cloth hat in a relatively light work in a factory or a factory rather than a labor test cap. About.

  Conventionally, cloth caps (cloth caps) are used as hats used in assembly work of automobiles and light work in factories, instead of standard protective caps (certification caps) under the Industrial Safety and Health Act. Since the cloth hat is lightweight, the operator can wear it without any sense of incongruity, and it is possible to prevent troubles in work (for example, fatigue of the neck due to wearing a heavy hat).

Further, as a helmet worn by an occupant when riding a vehicle such as a motorcycle or a motorbike, a helmet having a step formed on the top of the cap body is known (for example, see Patent Document 1).
JP 2001-20121 A

  By the way, even in the above-described light work, an operator who faces the projecting part of the automobile upwards when the assembly work is carried out under the automobile being assembled, such as parts or screws during assembly work. There is a possibility that the head may interfere with each other or other obstacles may interfere with the operator's head, and the cloth hat may not be able to sufficiently absorb the impact against the interference.

  Therefore, it is conceivable to wear a labor test cap (for example, a helmet that must be worn when operating a crane or a forklift) instead of a cloth cap.

  However, since labor test caps are heavier than cloth caps, in light work where work is often required to repeat upwards or downwards compared to crane operations, etc. There is a risk of adverse effects such as stiff shoulders.

  In addition, the helmet described in Patent Document 1 has a sufficient shock absorbing capability with respect to the impact of a collision accident applied rearward from the front edge of the helmet. There are many situations in which an impact force from the upper part to the lower part or an impact force from the upper part of the cap body obliquely to the rear side is applied due to work in a state of looking up (upward). It is difficult for the helmet described in Patent Document 1 to sufficiently absorb the force. In addition, the helmet described in Patent Document 1 is heavier than a cloth hat, similar to a labor test cap.

  The present invention has been made in view of the above problems, and has an object to provide a cap body for a light work hat that is light in weight and can reliably absorb an impact applied downward from the top. And

  According to the first aspect of the present invention, in the cap body of the light work hat formed in a bowl shape, a first step provided in an intermediate portion in the height direction of the cap body, and a top portion of the cap body And the cap body of the light work hat which has the 2nd level | step difference provided so that this vicinity may become convex on the outer surface of the said cap body.

  According to a second aspect of the present invention, in the cap body of the light work hat according to the first aspect, the first step is formed by an elongated concave portion that is recessed from the shape of the entire cap body. It is a hat body.

  The invention according to claim 3 is the cap body of the light working hat according to claim 1 or 2, wherein the convex portions are provided on the outer surface of the cap body on both side surfaces in the vicinity of the edge of the cap body. It is the cap body of the light work hat which has.

  According to a fourth aspect of the present invention, in the cap for a light work cap according to any one of the first to third aspects, the first step is near the first step and above the first step. Is a cap body of a light work hat provided with a through hole.

  Advantageous Effects of Invention According to the present invention, there is an effect that it is possible to provide a cap body of a light work hat that is lightweight and can reliably absorb an impact applied downward from the upper part.

  FIG. 1 is a perspective view showing a configuration of a cap body 1 of a light work cap according to an embodiment of the present invention, and FIG. 2 is a front view of the cap body 1 as viewed from the direction of arrow II in FIG.

  3 is a rear view of the cap body 1 as viewed in the direction of arrow III in FIG. 1, and FIG. 4 is a side view of the cap body 1 in FIG.

  5 is a plan view of the cap body 1 as viewed from the direction of arrow V in FIG. 1, and FIG. 6 is a bottom view of the cap body 1 as viewed from the direction of arrow VI in FIG.

  7 is a cross-sectional view taken along line VII-VII in FIG. 2, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

  FIG. 9 is an enlarged view of a predetermined portion shown in FIG. 7 or FIG. 9A is an enlarged view of the IXA section shown in FIG. 7, FIG. 9B is an enlarged view of the IXB section shown in FIG. 8, and FIG. 9C is an IXC section shown in FIG. It is an enlarged view of a part.

  FIG. 10 is a cross-sectional view showing a schematic configuration of a light work cap (helmet) 3 in which an interior body 5 is installed on the cap body 1.

  The cap body 1 is not a labor test cap, but is used as a cap body for a cap 3 (light work hat) used in place of a cloth hat in automobile assembly work or light work in a factory. Yes, and used as the light work cap 3 with the interior body 5 installed therein (see FIG. 10). That is, it is installed on the head of the worker P via the interior body 5.

  The cap body 1 is formed in a bowl shape with a synthetic resin such as polyethylene, polypropylene, ABS, polycarbonate, etc., and has a central surface (the top (head) of the cap body 1 or the center of the cap body 1 before and after the cap body 1). It is formed symmetrically with respect to a plane extending vertically.

  In addition, the cap body 1 is provided with a first step (lower step; first rib) 7 and a second step (upper step; second rib) 9.

  The first step (stepped portion) 7 is provided on the outer surface 11 and the inner surface 13 of the cap body 1 at an intermediate portion in the height direction of the cap body 1. Further, the first step 7 extends, for example, from one side of the cap body 1 to the other side (togakugawa) and extends to the other side (togakugawa) (see FIG. 5). As shown in FIG. 4, it is formed in a “U” shape in a plan view, and extends toward the upper side of the cap body 1 as it goes rearward of the cap body 1 (see FIG. 4).

  The first step 7 will be described in more detail. The first step 7 is an elongated shape that is recessed from the overall arcuate shape of the cap body 1 (more precisely, a shape using a part of a spherical shell). It is formed of a recess and has a stepped shape. The concave portion of the first step 7 is formed to be recessed inside the cap body 1 from the two-dot chain line (the overall shape of the cap body 1) shown in FIG. In addition, the cross-sectional shape of the concave portion (the cross-sectional shape by a plane orthogonal to the extending direction of the concave portion) is an isosceles triangle shape whose apex angle located at the deepest portion of the concave portion is an obtuse angle. Moreover, the thickness of the cap body 1 is substantially equal regardless of whether it is the concave portion or the portion other than the concave portion. Since it is formed in this way, the rigidity (in particular, the rigidity of the lower portion 17) with respect to the moment M1 generated when the downward impact force from the top of the cap body 1 is applied to the cap body 1 is high. .

  Note that, due to the first step 7, for example, the upper (top) portion 15 of the cap body 1 may be more convex on the outer surface 11 of the cap body 1 than the lower (edge side) portion 17.

  Further, the step angles of the first step 7 are obtuse angles α1 and α3 (see FIG. 9A). Since the obtuse angle is thus formed, the cap body 1 can be easily molded, and concentration of stress generated when a load is applied to the cap body 1 can be avoided.

  The second step (step portion) 9 is formed so that the top of the cap body 1 and the vicinity thereof are convex on the outer surface 11 of the cap body 1 (so that the inner surface 13 of the cap body 1 is concave). The cap body 1 is provided extending in the front-rear direction.

  Moreover, the 2nd level | step difference 9 is provided in the one side (soakkugawa) and the other side (tasogawa) of the cap body 1. FIG. A step provided on the left side of the cap body 1 is a step 9A, and a step provided on the right side is a step 9B.

  The height h (see FIG. 4) of the second step 9 (each step 9A, 9B) increases from the front of the cap body 1 toward the top (maximum of about 5 mm), and the rear of the cap body 1 It grows as it goes from the top to the top, and is the largest in the vicinity of the top. In addition, the width of the second step 9 (the interval W between the left step 9A and the right step 9B in the left-right direction of the cap body 1; see FIG. 5) gradually increases from the front to the rear of the cap body 1. It has become. Furthermore, the angles of the second step 9 are obtuse angles β1 and β3 as in the case of the first step 7 described above (see FIG. 9B).

  On both side surfaces in the vicinity of the lower edge of the cap body 1, there are provided convex portions 19 that are convex on the outer surface of the cap body 1 (the inner surface of the cap body 1 is concave) (FIG. 2). , FIG. 3 and FIG. 4). Further, a ball edge 21 is formed on the entire circumference of the edge of the cap body 1 (see FIGS. 7 and 9).

  The cap body 1 is provided with through holes 23 and 25 penetrating between the outside and the inside of the cap body 1. The through holes 23 and 25 are provided in the vicinity of the first step 7 and on the upper side (top side) of the first step 7. A plurality of through-holes 23 are provided on both side portions of the cap body 1 to form a first group of through-holes (parallelogram-shaped through-holes arranged in a line from the front side to the rear along the first step 7). The through-hole 25 is a second group of through-holes provided in the rear part of the cap body 1 (through an isosceles trapezoidal through-hole extending on the lower side; through-holes arranged in the horizontal and vertical directions ) Is formed.

  Furthermore, the thickness of the cap body 1 increases from the top (upper side) to the edge (lower side). Specifically, the thickness gradually increases at the second step 9 and the first step 7. Further, the wall thickness gradually increases from the first step 7 toward the edge.

  Here, the first step 7 and the through holes 23 and 25 will be described in more detail.

  The size of the first step 7 is about 1 to 3 mm, and when the cap body 1 is viewed from the side, it looks almost linear (see FIG. 4). In addition, the first step 7 is formed in an elliptical arc shape or an arc shape (a shape in which the radius of curvature increases as approaching the central portion in the width direction of the cap body 1) when the cap body 1 is viewed from the rear. (See FIG. 3). Therefore, when the cap body 1 is viewed from the rear, the first step 7 appears linear in the vicinity of the central portion in the width direction of the cap body 1.

  Further, each end portion (left and right end portions) on the front side (front side in the cap body 1) of the first step 7 is about 1/4 of the height HA of the cap body 1 in the vertical direction of the cap body 1. The distance between the front end portions (left and right end portions) of the first step 7 (the distance in the left-right direction of the cap body 1) is the cap position (see dimension H1 in FIG. 4). It is located at about 2/3 of the full width BA of the body 1 (see dimension B1 in FIG. 5). Further, the height H2 of the highest portion on the rear side of the first step 7 (the portion located rearmost of the cap body 1) is about 2/3 of the height HA of the cap body 1 ( (See FIG. 4).

  As shown in FIG. 4, the through hole 23 is formed in a substantially parallelogram shape. In order to avoid stress concentration, the corners are arcuate. One side of the size of the through hole 23 is about 1/30 to 1/10 of the height HA of the cap body 1, and is sufficiently smaller than the size of the cap body 1.

  A plurality of through holes 23 are provided, for example, seven (number of one side). Then, the first step 7 is provided along the first step 7 at a position slightly above the first step 7 above the first step 7. Also, the lower side 23A of each through-hole 23 is substantially parallel to the first step 7, and the distance between the side 23A and the first step 7 is substantially equal to the length of the side 23A. Or slightly smaller or larger than the length of the side 23A. Further, the distance between the through holes 23 (the width LB of the meat portion of the cap body 1 where the through holes 23 are not formed) is also slightly smaller or larger than the length of the side 23A. Further, each through-hole 23 is provided from the front end portion of the first step 7 to the substantially central portion in the front-rear direction of the cap body 1.

  As shown in FIG. 3, the through-hole 25 is formed in a substantially isosceles trapezoidal shape. In order to avoid stress concentration, the corners are arcuate as in the case of the through hole 23. The height of the isosceles trapezoidal through hole 25 is substantially equal to the length 23A of one side of the through hole 23, or slightly smaller or larger than the length of the side 23A. The length of the lower base of the isosceles trapezoidal through-hole 25 is about two to four times the length of the side 23A.

  For example, nine through holes 25 are provided in a plurality of rows and a plurality of columns. Three through-holes (lowermost through-holes) 25 located at the lowermost side are located above the first step 7 and slightly away from the first step 7 at the first step 7. It is provided along. The lower bottom of each through hole 25 in the bottom row is substantially parallel to the first step 7, and the distance between the lower bottom of each through hole 25 and the first step 7 is the through hole 25. Is substantially equal to the height of the through hole 25 or slightly smaller or larger than the height of the through hole 25. Further, the distance between the bottom through holes 25 (the distance in the width direction of the cap body 1) is also slightly smaller or larger than the length of the side 23A. Furthermore, the through holes 25 in the lowermost row are arranged symmetrically at the rear of the cap body 1. Above each through hole 25 in the lowermost row, each through hole 25 constituting another row is provided, but each through hole 25 has a lower bottom or upper bottom size in the upper row. It is getting smaller.

  Here, the deformation state of the cap body 1 when an impact force is applied will be described.

  FIGS. 11 to 13 are diagrams showing a deformed state of the cap body 1 when an impact force is applied to the cap body 1.

  Here, FIG. 11A is a side view showing a deformed state of the cap body 1 when a relatively small impact force is applied almost directly above the cap body 1. FIG. 11B is a side view of FIG. It is a front view of a).

  FIG. 12A is a side view showing a deformed state of the cap body 1 when a relatively large impact force is applied almost directly above the cap body 1. FIG. 12B is a side view of FIG. It is a front view.

  FIG. 13A is a side view showing a deformed state of the cap body 1 when a relatively small impact force is applied obliquely from above the cap body 1, and FIG. 13B shows a relatively large impact force. It is a side view which shows the deformation | transformation state of the cap body 1 when applied from diagonally upward of the cap body 1. FIG.

  As can be understood from FIGS. 11 to 13, the cap body 1 is deformed above the second step 9 with a relatively small impact force, and above the first step 7 with a relatively large impact force. The cap body 1 is deformed.

  FIG. 14 is a diagram comparing impact forces of a conventional cap body (helmet) and cap body 1 (helmet 3).

  As shown in FIG. 10, the impact force is applied to a striker S (for example, see FIG. 11) by covering the head of a model of a person P with a cap body 1 (helmet 3) provided with an interior body 5. The hemispherical striker in “JIS T 8131-2000” is dropped from a predetermined height, and at this time, the load is detected by a load cell (not shown) installed between the lower part of the model and the floor GL Is required.

  The horizontal axis in FIG. 14 indicates the drop height of the striker (mass 5 kg) S, and the vertical axis in FIG. 14 indicates the measured value of the load cell.

  A graph G1 in FIG. 14 shows measured values of the helmet 3 (cap body 1), and the graph G3 shows the conventional product (type) of the applicant without the first step 7, the second step 9, and the projection 19 of the present application. Name: SCL-200). As can be understood from FIG. 14, the helmet 3 (cap body 1) can reduce the impact force.

  Each graph GA, GB, GC of FIG. 15 is a plane in the striker S2 (for example, “JIS T 8131-2000” as shown in FIG. 11) from directly above the helmet (cap body) as shown in FIGS. It is a graph which shows the relationship between the deformation | transformation amount (displacement) of a cap body and the magnitude | size of a static load when a static load is added with a shape striker.

  The graph GA is a cap body in which the steps 7 and 9 and the through holes 23 and 25 are not formed, and the graph GB has the steps 7 and 9 but the through holes 23 and 25. The graph GC is that of the cap body in which the steps 7 and 9 and the through holes 23 and 25 are formed. As is clear from the graphs GA, GB, and GC, the cap body in which the steps 7 and 9 and the through holes 23 and 25 are formed has the largest displacement with respect to the static load (the graph is on the right side). Is shifting). Therefore, it is easy to absorb the impact force.

  More specifically, as the displacement increases as the static load increases, the displacements of less than 18 mm have a gentler slope of the graphs GB and GC than the graph GA, and the displacement is the same even with the same load amount. It is getting bigger. From this, it can be said that the cap bodies of the graphs GB and GC are more likely to absorb the impact force. This is an effect due to the deformation of the step 9.

  Further, in the range of displacement of 18 to 22 mm, the load value decreases in the graph GA to the right. However, in the graphs GB and GC, the load value stabilizes at about 450 N after the load value decreases almost vertically. Yes. This is because, even if the step 9 cannot support the load and the cap body starts to deform, the step 7 having the above-described shape provided next receives the load. For this reason, the graphs GA and GB show a load about 1.5 times that of the graph GA in which the load rapidly decreases to less than 300N. This is because the shock absorbing force is increased for the initial stage impact to suppress the impact on the worker P, and when a larger load is applied, the cap body 1 and the head of the worker P are brought into contact with each other. Can be prevented.

  Further, in the present invention, the distance between the top of the head of the worker P and the cap body 1 is designed to be 34 mm, but the load of this displacement consular is about 370 N for the graph GA, about 650 N for the graph GB, and the graph GC. It can be seen that the load capacity is about 610 N, which is nearly double the load capacity. This means that the head of the worker P and the cap body 1 do not contact each other unless a load nearly twice that of GA is applied, which is important in protecting the head of the worker P.

  According to the helmet 3 (cap body 1), the first step 7 provided in the intermediate portion in the height direction and the second step 9 provided near the top of the cap body 1 are provided. Therefore, each level | step difference 7 and 9 plays the role of a reinforcement rib, and can improve the rigidity of the cap body 1 (without weight reduction), without increasing a weight. That is, although the helmet 3 is slightly heavier than the cloth hat, it can be configured to be sufficiently lighter than the labor verification cap, thereby preventing the operator from feeling uncomfortable during light work. It is possible to prevent a reduction in work efficiency.

  Moreover, according to the cap body 1, since the level | step difference is provided in the intermediate part of the height direction of the cap body 1, and the top part of the cap body 1, FIG. 11-FIG. As shown in FIG. 12, the impact applied downward from the upper part of the cap body 1 can be absorbed reliably.

  Further, according to the cap body 1, the first step 7 extends from one side of the cap body 1 to the other side (togakugawa) and extends to the other side. It is formed in a letter shape and extends toward the upper side of the cap body 1 toward the rear of the cap body 1, and the width of the second step 9 (the right step and the left step in the left-right direction of the cap body) The distance W from the step is gradually increased from the front to the rear of the cap body 1. Therefore, as shown in FIG. 13, even when an impact force is applied from the diagonally upper front portion of the cap body 1 to the diagonally rearward direction, the impact force in such a direction can be sufficiently absorbed.

  Furthermore, if the impact is relatively small, only the upper part of the second step 9 is deformed with the second step 9 as a boundary, as shown in FIGS. 11 and 13A. If it is this small deformation, it can be easily repaired and the strength of the cap body 1 is hardly lowered, so that the helmet 3 can be reused immediately.

  On the other hand, if the impact is relatively large, as shown in FIG. 12 and FIG. 13B, the upper part of the first step 7 is deformed with the first step 7 as a boundary. In the case of such a large deformation, there is a high possibility that the strength of the cap body 1 is reduced due to the impact, so that the cap body 1 can be discarded.

  Further, according to the cap body 1, the second steps 9 </ b> A and 9 </ b> B increase from the front of the cap body 1 toward the top, and increase from the rear of the cap body 1 toward the top. Since it is the largest in the vicinity of the top, when absorbing a small impact force from the top of the cap body 1, the top of the cap body 1 and a portion in the vicinity thereof are more easily deformed. A small impact force can be absorbed more reliably.

  Moreover, according to the cap body 1, since the convex part 19 is provided in the outer surface of the both sides near the edge which exists in the lower part of the cap body 1, the rigidity of the lower part of the cap body 1 (especially front and back of the cap body 1) Direction stiffness). Further, since a concave portion (pocket) is formed inside the convex portion 19 on the side surface, a rib is provided in the concave portion, and the rigidity of the cap body 1 can be further improved.

  Furthermore, according to the cap body 1, since the bead 21 is formed on the entire circumference of the edge portion of the cap body 1, the rigidity at the edge portion of the cap body 1 is improved.

  Further, according to the cap body 1, since the through holes 23 and 25 are provided, the rigidity of the cap body 1 around the first step 7 can be adjusted to an appropriate size, and the inside of the cap body 1 can be adjusted. The air permeability can be improved.

  In addition, this invention is not limited only to the light work hat, It can be used also for a test | inspection cap etc.

It is a perspective view which shows the structure of the cap body of the cap for light work which concerns on embodiment of this invention. FIG. 2 is a front view of the cap body 1 as viewed from an arrow II in FIG. 1. FIG. 3 is a rear view of the cap body 1 as viewed from an arrow III in FIG. 1. FIG. 4 is a side view of the cap body 1 as viewed from an arrow IV in FIG. 1. FIG. 2 is a plan view of the cap body 1 as viewed from the direction of arrow V in FIG. 1. FIG. 4 is a bottom view of the cap body 1 as viewed from the direction indicated by an arrow VI in FIG. 1. It is VII-VII sectional drawing in FIG. It is VIII-VIII sectional drawing in FIG. It is an enlarged view of the predetermined part shown in FIG.7 and FIG.8. It is sectional drawing which shows schematic structure of the cap for light work in which the interior body was installed in the cap body. It is a figure which shows the deformation | transformation state of a cap body when an impact force is applied to a cap body. It is a figure which shows the deformation | transformation state of a cap body when an impact force is applied to a cap body. It is a figure which shows the deformation | transformation state of a cap body when an impact force is applied to a cap body. It is the figure which compared the impact force of the conventional cap body and the cap body which concerns on embodiment of this invention. When a static load is applied to each cap body of a conventional cap body, a cap body similar to the cap body according to the embodiment of the present invention, which is not provided with a through hole, and the cap body according to the embodiment of the present invention. 6 is a graph showing the amount of deformation that occurs in the cap body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cap body 3 Helmet 7 1st level | step difference 9 2nd level | step difference 11 Outer surface 19 Convex part 21 Margin 23, 25 Through-hole

Claims (4)

In the cap body of a light work hat formed in a bowl shape,
A first step provided at an intermediate portion in the height direction of the cap body;
A second step provided so that the top of the cap body and the vicinity thereof are convex on the outer surface of the cap body;
A cap body for a light work hat characterized by comprising: The cap body of the light work hat according to claim 1,
The cap body of a light work cap, wherein the first step is formed by an elongated recess recessed from the shape of the entire cap body. In the cap body of the light work hat according to claim 1 or claim 2,
A cap body for a light work cap, characterized by having convex portions provided on the outer surface of the cap body on both side surfaces in the vicinity of the edge of the cap body. In the cap body of the light work hat according to any one of claims 1 to 3,
A cap body for a light work cap, characterized in that a through hole is provided in the vicinity of the first step and above the first step.

Images