JP4769321B2 - Cushion rib molding method - Google Patents

Description

The present invention relates to a method for forming a cushion rib .

  As described in Patent Document 1, as the cleaning tool, the upper surface outer peripheral portion of the cushion body is coupled to the lower surface outer peripheral portion of the cleaning tool main body to which the handle is attached, and the lower surface central rib of the cleaning tool main body is formed in the upper surface central portion of the cushion body. The central part of the cleaning surface on the lower surface of the cushion body is pushed out to a convex curved surface, and the elastic spacer is compressed and deformed by the pressing force from the handle. Some have a flat surface.

  According to the cleaning tool of Patent Document 1, while the cleaning surface is switched to a curved surface or a flat surface by the operation of the handle, the cleaning surface is avoided while adhering large dust or dirt around the cleaning surface. The floor surface can be efficiently cleaned by adhering dust and dirt to the entire cleaning sheet.

JP2001-299659

  By the way, as shown in FIG. 9, the cushion body 1 of Patent Document 1 is formed by foaming urethane foam or the like with a mold 2 along a longitudinal direction of a central abutment base 1 </ b> A provided at the center of the upper surface of the cushion body 1. Elastic spacers 1B are formed in a convex shape at a plurality of positions, and adjacent elastic spacers 1B are spaced apart from each other.

  At this time, the mold 2 is composed of an upper mold 2A and a lower mold 2B. The upper mold 2A and the lower mold 2B are provided with the cushion body molding portion 3, the upper mold 2A is provided with the elastic spacer molding portion 4, and foamed urethane or the like is provided. Injected upper mold 2A and lower mold 2B are inclined and arranged along the longitudinal direction to form cushion body 1.

  When the cushion body 1 is molded by the mold 2, urethane foam or the like foams in order from the lower side to the upper side of the cushion body molding portion 3 of the mold 2 that is inclined, and the cushion body 1 is molded. A part of the foam enters the upper elastic spacer forming portion 4 in order from the lower elastic spacer forming portion 4 to sequentially form a plurality of elastic spacers 1B along the longitudinal direction of the cushion body 1.

  However, when foaming such as urethane foam enters the elastic spacer molding part 4 of the mold 2, the foaming leaves air behind the elastic spacer molding part 4 because the elastic spacer molding part 4 is closed. And a dead end state (FIG. 9B). For this reason, in the molded cushion body 1, the height dimensional accuracy of the elastic spacer 1B deteriorates, and the desired convex curve is formed on the cleaning surface of the lower surface of the cushion body 1 when used in combination with the cleaning tool body. The surface or flat surface cannot be formed, and the cleaning workability is not improved.

The subject of this invention is improving the molding dimension precision of the cushion rib provided in a cushion body .

The invention of claim 1 is a molding method for molding a cushion body having a cushion rib molded from urethane foam on the upper surface by a mold, wherein the mold composed of an upper mold and a lower mold is formed in the longitudinal direction of the cushion body molding portion. The cushion rib forming portion provided on the upper mold is continuously arranged along the tilt direction of the mold, and is molded in the following process .
Step 1: The upper mold of the mold is opened, and the urethane foam is injected near the upper end of the cushion body molding portion of the lower mold in which the urethane foam is inclined.
Step 2: The upper mold is closed at the timing when the foamed urethane injected into the lower mold cushion body molding portion flows to the lower side.
Step 3: The urethane foam in the mold foams in order from the lower side of the cushion body molding part to mold the cushion body.

ADVANTAGE OF THE INVENTION According to this invention, the shaping | molding dimension precision of the cushion rib provided in a cushion body can be improved.

FIG. 1 is a perspective view showing the cleaning tool partially broken. 2A and 2B are cross-sectional views of the cleaning tool, wherein FIG. 2A is a cross-sectional view in which the cleaning surface is a curved surface, and FIG. 2B is a cross-sectional view in which the cleaning surface is a flat surface. FIG. 3 is a bottom perspective view showing the cleaning tool main body. FIG. 4 is a top perspective view showing the cushion body. 5A and 5B show the cushion body, in which FIG. 5A is a plan view and FIG. 5B is a cross-sectional view taken along line BB in FIG. 6A and 6B are perspective views showing an initial stage of injection of foamed urethane and the like, and FIG. 6B is a perspective view showing an intermediate stage of injection of foamed urethane and the like. FIG. 7 shows a molded state of the cushion body of the present invention, (A) is a perspective view showing the main part of the cushion body, and (B) is a cross-sectional view showing a lower molded state of the mold. FIG. 8 is a cross-sectional view showing an upper molding state of the mold. FIG. 9 shows a molded state of a conventional cushion body, (A) is a perspective view showing the main part of the cushion body, and (B) is a sectional view showing a lower molded state of the mold.

  As shown in FIGS. 1 and 2, the cleaning tool 10 is fitted with an upper surface outer peripheral groove portion 22B (upper surface outer peripheral portion) along the outer peripheral edge 22A of the cushion body 21 on the lower surface outer peripheral wall portion 12 (lower surface outer peripheral portion) of the cleaning tool body 11. The cleaning sheet 31 covers the cleaning surface 21A on the lower surface of the cushion body 21 and holds the handle 41 provided on the upper surface of the cleaning tool body 11 by hand. By cleaning the floor surface, dust and dirt on the floor surface are attached to the cleaning sheet 31 for cleaning.

  As shown in FIGS. 1 to 3, the cleaning tool main body 11 is a substantially rectangular flat plate material made of synthetic resin, has an outer peripheral wall portion 12 whose outer peripheral edge is bent downward, and is a hollow portion surrounded by the outer peripheral wall portion 12. Further, one or more lower surfaces provided with a linear lower surface central rib 13 (lower surface rib) extending in the center from one end side to the other end side in the longitudinal direction and extending in parallel with a gap on both sides thereof. Side ribs 14 are provided. In addition, you may equip this hollow part of the cleaning tool main body 11 with other reinforcement ribs, such as crossing the ribs 13 and 14.

  The cleaning tool main body 11 includes a circular curved depression 15 at the center of the upper surface opposite to the hollow portion where the ribs 13 and 14 are provided, and a handle 41 is provided on the upper surface of the curved depression 15 via a universal joint 16. It is connected. The handle 41 is swingable back and forth and right and left with respect to the cleaning tool body 11 via the universal joint 16. At the four corners of the upper surface of the cleaning tool main body 11, sheet locking tools 17 that allow the cleaning sheet 31 to be freely engaged and disengaged are provided.

  As shown in FIGS. 4 and 5, the cushion body 21 is made of soft and elastic foamed urethane or the like, and is formed so that the lower surface is a flat cleaning surface 21 </ b> A before being fitted to the cleaning tool body 11. The The cushion body 21 has an outer peripheral groove portion 22B along the outer peripheral edge 22A, and the outer peripheral wall portion 12 of the cleaning tool main body 11 is fitted into the outer peripheral groove portion 22B, whereby the cleaning tool main body 11 and the cushion body 21 are assembled and integrated. .

  The cushion body 21 includes a central support base 23 extending from one end side to the other end side along the longitudinal direction of the central portion of the upper surface corresponding to the lower surface central rib 13 of the cleaning tool body 11, and the longitudinal length above the central support base 23. A cushion rib 24 formed in a certain range along the direction is provided. In addition, at positions corresponding to the lower surface side ribs 14 of the cleaning tool main body 11, there are provided side support bases 25 extending in parallel at intervals on both sides of the central support base 23.

  Therefore, in the cleaning tool 10, as shown in FIG. 2 (A), the lower surface central rib 13 of the cleaning tool body 11 and the cushion ribs of the cushion body 21 are assembled in a state where the cleaning tool body 11 and the cushion body 21 are assembled and integrated. 24, the lower surface side rib 14 of the cleaning tool body 11 is separated from the side support base 25 of the cushion body 21, and the central portion of the cleaning surface 21A on the lower surface of the cushion body 21 is pushed out to make the cleaning surface 21A a convex curved surface. .

  On the other hand, as shown in FIG. 2 (B), by applying a pressing force applied to the handle 41 from the cleaning tool body 11 to the cushion body 21, the cushion rib 24 of the cushion body 21 is moved by the lower surface central rib 13 of the cleaning tool body 11. The cushion rib 24 is crushed so as to bite into the central support base 23 by being compressed and deformed, and the lower surface side rib 14 is brought into contact with the side support base 25, while the cleaning surface 21 </ b> A on the lower surface of the cushion body 21 is not subjected to pressing force. The convex curved surface can be deformed so as to approach a substantially flat surface, and the entire surface can be brought into contact with the floor surface.

  However, in the cleaning tool 10, the cushion rib 24 of the cushion body 21 is continuous within a certain range along the longitudinal direction of the central portion of the upper surface of the cushion body 21 as shown in FIGS. This is repeated by providing a bent portion having a broken line shape (which may be a wave shape, an S shape, etc.) that intermittently crosses the straight central rib 13 of the tool body 11.

  Furthermore, the cushion rib 24 continues in the advancing direction along the longitudinal direction of the central portion of the upper surface of the cushion body 21 over the entire length. “Continuing in the advancing direction along the longitudinal direction” means that when the cushion rib 24 is traced from one end side along the longitudinal direction of the cushion body 21 to the other end side, it always continues toward the direction (advancing direction) approaching the other end side. Means that.

  As shown in FIG. 5A, the cushion rib 24 of the present embodiment has a center line at the center of the upper surface of the cushion body 21 when one end in the longitudinal direction of the cushion body 21 is positioned lower and the other end is positioned higher. A left-upward oblique line portion 24A that crosses C diagonally upward from the right side to the left side, and a left-side straight line portion that extends parallel to the centerline C upward from the left end of the left-upward oblique line portion 24A on the left side of the center line C 24B, an upper right diagonal portion 24C crossing the center line C from the left side to the right side from the upper end to the right side of the left straight portion 24B, and an upper side from the right end of the upper right diagonal portion 24C on the right side of the center line C. The right straight portion 24D extending in parallel to the center line C is connected in order and is continuous.

  Note that the angle of the bent portion of the cushion rib 24 is preferably a wide angle (practical product is 130 degrees), more preferably 110 to 150 degrees. When approaching, the contact area with the main body rib is too large).

  In the cleaning tool 10 of the present invention, since the curved depression 15 provided at the center of the upper surface of the cleaning tool main body 11 protrudes on the lower surface side, the cushion corresponding to the protrusion of the curved depression 15 on the lower surface side. The cushion rib 24 is not provided on the upper surface of the body 21. Accordingly, the cushion rib 24 is divided at the central portion along the longitudinal direction of the cushion body 21. However, when there is no curved depression 15 that adversely affects the cushion rib 24, the cushion rib 24 can be continued over the entire length from one end side to the other end side along the longitudinal direction of the cushion body 21.

Hereinafter, a method of forming the cushion body 21 with the mold 50 will be described.
6, the mold 50 includes an upper mold 51 and a lower mold 52. The upper mold 51 and the lower mold 52 form cushion body molded parts 51A and 52A, and the upper mold 51 forms an outer periphery molded part 51B, An outer peripheral groove forming portion 51C, a support base forming portion 51D, and a cushion rib forming portion 51E are formed. The mold 50 is inclined and disposed along the longitudinal direction with the upper mold 51 and the lower mold 52 filled with urethane foam and the like closed, and the cushion body 21 is molded while foaming urethane foam and the like by low pressure foaming. That is, the molding procedure of the cushion body 21 by the mold 50 is as follows.

  (1) The upper mold 51 of the mold 50 is opened, the lower mold 52 is inclined, and urethane foam or the like is injected near the upper end of the cushion body molding portion 52A of the lower mold 52 by an injection nozzle (FIG. 6A). .

  (2) The upper mold 51 is closed at an appropriate timing when urethane foam or the like injected into the cushion body molding portion 52A of the lower mold 52 flows downward due to gravity (FIG. 6B).

  (3) The foamed urethane or the like in the mold 50 is foamed in order from the lower side of the cushion body forming portions 51A and 52A to form the cushion body 21, and a part of the foam is formed as the outer peripheral edge forming portion 51B and the outer peripheral groove forming. The outer peripheral edge 22A, the outer peripheral groove 22B, the support bases 23 and 25, and the cushion rib 24 of the cushion body 21 are formed in order from the lower part into the part 51C, the support base molding part 51D, and the cushion rib molding part 51E (FIG. 7). (B)).

  In addition, an exhaust hole 53 communicating with the outer peripheral edge forming part 51B and opening to the outside is formed in the uppermost part in the longitudinal direction of the upper mold 51. The air in the upper mold 51 and the lower mold 52 pushed up by the foamed urethane or the like in (3) is discharged to the outside from the exhaust hole 53. Urethane foam or the like that pushes out air also flows out from the exhaust hole 53, but this urethane foam or the like is removed after the cushion body 21 is molded.

According to the present embodiment, the following operational effects can be obtained.
(a) Due to the elasticity of the cushion rib 24 formed on the cushion body 21, the cleaning surface 21A on the lower surface of the cushion body 21 can be smoothly switched to a curved surface or a substantially flat surface by operating the handle 41.

  Therefore, for large dust and debris on the floor surface, the cleaning surface 21A is curved and the floor surface is wiped in a state where a gap is held on the outer edge side of the cleaning surface 21A. Without being deposited around the cleaning surface 21A, it can be adhered to the cleaning sheet 31 on the cleaning surface 21A. On the other hand, by applying a pressing force to the handle 41 and making the cleaning surface 21A a substantially flat surface from the curved surface before the pressing force is applied and wiping the entire surface in contact with the floor surface, dust and dirt on the entire cleaning sheet 31 are removed. Can be attached and cleaned.

  At this time, the cushion rib 24 of the cushion body 21 has a bent shape that intermittently crosses the lower surface central rib 13 of the cleaning tool main body 11, and the cushion rib 24 is only at each local portion that is spaced apart in the longitudinal direction of the central rib 13. Therefore, the pressing force of the handle 41 is elastically transmitted to the cushion body 21 through each local portion of the cushion rib 24, and the cleaning surface 21A can be smoothly switched to a curved surface or a flat surface with a light force.

  (b) When the cushion body 21 is molded by the mold 50, urethane foam or the like is foamed in order from the lower side of the cushion body molding portions 51A and 52A of the mold 50 that is inclined to form the cushion body 21. Part of this foam enters the cushion rib forming portion 51E and the like in order from the bottom, and the cushion rib 24 and the like are formed. At this time, since the cushion rib molding part 51E is continuous along the longitudinal direction and repeatedly bends, the urethane foam or the like entering the cushion rib molding part 51E continues from below to above inside the cushion rib molding part 51E. It fills up in the shape. Therefore, the air inside the cushion rib molding portion 51E is discharged without being pushed upward by the filled foaming urethane or the like and remains, and the molding dimensional accuracy of the cushion rib 24 provided in the molded cushion body 21 is increased. Can be improved. Thereby, in the cleaning tool 10 which couple | bonded the cushion body 21 with the cleaning tool main body 11, the expected convex curved surface and flat surface are formed in the cleaning surface 21A of the lower surface of the cushion body 21, and cleaning workability | operativity is improved. Can do.

(c) Since the cushion rib molding part 51E provided in the mold 50 is continuous in the advancing direction along the longitudinal direction of the cushion body molding part 51A over the entire length, the cushion rib molding part 51E of the mold 50 arranged in an inclined manner is It is possible to make sure that the air of the above-mentioned (b) is pushed out by extending upward over the entire length.

  The cushion rib molding method of the present invention can also be used as a cushion rib molding method for general purposes that is not limited to a cleaning tool.

  Further, the cushion rib and the lower surface rib of the cleaning tool main body are not limited to this embodiment, and can take various shapes. For example, the lower surface rib of the cleaning tool body is bent, and the cushion rib is straight, or obliquely crosses the lower surface rib of the linear cleaning tool body (when crossing diagonally, the two ribs are not orthogonal to each other. It is also possible to provide a plurality of cushion ribs.

ADVANTAGE OF THE INVENTION According to this invention, the shaping | molding dimension precision of the cushion rib provided in the cushion body used for a cleaning tool etc. can be improved.

21 Cushion body 24 Cushion rib 50 Mold
51 Upper mold
52 Lower mold 51A, 52A Cushion body molding part 51E Cushion rib molding part

Claims (2)

A molding method for molding a cushion body provided with a cushion rib formed of foamed urethane on an upper surface by a mold,
A mold composed of an upper mold and a lower mold is arranged in an inclined manner along the longitudinal direction of the cushion molded part,
The cushion rib molding part provided in the upper mold is continuous along the inclination direction of the mold ,
A cushion rib molding method for molding in the following steps .
Step 1: The upper mold of the mold is opened, and the urethane foam is injected near the upper end of the cushion body molding portion of the lower mold in which the urethane foam is inclined.
Step 2: The upper mold is closed at the timing when the foamed urethane injected into the lower mold cushion body molding portion flows to the lower side.
Step 3: The urethane foam in the mold foams in order from the lower side of the cushion body molding part to mold the cushion body.   The cushion rib molding method according to claim 1, wherein the cushion rib molding portion provided in the mold is continuous in the advancing direction along the tilt direction of the mold and includes a bent portion.

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