JP7650735B2 - Drum for string winding device - Google Patents

Description

The present invention relates to a drum for a string winding device, and to a drum for a string winding device that can quickly, easily, and reliably secure the end of the string.

Conventionally, a shoelace winding device with a small drum inside for winding up the shoelace has been proposed as a simple device for tightening shoelaces, etc.

JP 2015-293 A JP 2015-297 A Special Publication No. 2008-525052 International Patent Publication No. WO2006/050266 International Patent Publication No. WO2015/035885 Special table 2013-525007 publication International Patent Publication No. WO2011/137405 International Patent Publication No. WO2010/059989 International Patent Publication No. WO2015/039052 Patent No. 5925765 JP 2018-121890 A

Conventionally, fixing the end of a cord to a drum for a cord winding device required the delicate task of repeatedly inserting the end of the cord through small holes, each having a diameter of 1 to 2 mm, formed in a drum, which was often about 15 mm in diameter, which was time-consuming and labor-intensive.
More specifically, the through hole formed in conventional drums for cord winding devices is the hole that ultimately secures the end of the cord, and so the opening is set to a size just large enough for the cord to pass through. As a result, conventional drums for cord winding devices such as those described in the above-mentioned patent documents have the problem that they are unable to secure the end of the cord quickly, easily and reliably.
Furthermore, part of the end of the string is present in the winding section, which reduces the amount of string that can be wound by the winding section, or the end of the string protrudes into the winding section and interferes with the winding section, causing problems such as the string not being able to be wound smoothly.

Therefore, the object of the present invention is to solve the above-mentioned problems and to provide a drum structure for a cord winding device that allows the fixing operation between the drum and the cord to be performed quickly, simply and reliably, and ultimately to provide a drum for a cord winding device that is highly convenient and economical, making the assembly operation of the cord winding device and the maintenance operation of articles equipped with a cord winding device easy and low-cost.
Furthermore, an object of the present invention is to provide a drum for a cord winding device that can prevent a reduction in the amount of cord wound by the winding section and prevent the cord from being unable to be wound smoothly due to interference from the end of the cord.

(1) The most primary feature of the present invention is "a drum for a cord winding device having a bearing portion formed in the center of a main body, a tubular cord winding portion arranged outside the bearing portion, and annular flange portions formed on both axial ends of the cord winding portion, wherein the two through holes are formed at spaced positions on the cord winding portion, the through holes having an opening width larger than a stop portion formed by tying an end of the cord or the like so that the cord to be inserted can pass through smoothly, and a cord locking portion formed at a peripheral position of the bearing portion, the cord locking portion being arranged so that the end of the cord can pass straight and smoothly through the two through holes, and a gap formed between the cord locking portion and the cord winding portion, wherein after the end of the cord is inserted from one through hole to the other, the cord can be re-inserted through the gap between the cord locking portion and the cord winding portion, so that the stop portion formed by tying the end of the cord or the like can be fixed by the cord locking portion and the cord winding portion."

(2) In the drum for a cord winding device of the present invention, the cord engaging portion may be a shaft holder consisting of a pair of arc-shaped protrusions formed at a distance from each other around the bearing portion, and may be formed as a circle having the same diameter as the inside of the cord winding portion, or a circle having a larger diameter than the inside of the cord winding portion.
(3) In the drum for a cord winding device of the present invention, the cord engaging portion may be a shaft holder consisting of a pair of arc-shaped protrusions formed at a distance from each other around the bearing portion, and formed concentrically with the cord winding portion.
(4) Furthermore, the present invention provides a drum for a cord winding device, the drum having a bearing portion formed in the center of the main body, a cylindrical cord winding portion disposed outside the bearing portion, and annular flange portions formed on both axial ends of the cord winding portion, the drum having two through holes formed at positions spaced apart from each other in the cord winding portion, the through holes having an opening width larger than a stopper portion formed by tying the ends of the cord so that the cord to be inserted can pass through smoothly, and a cord locking portion and a cord retaining portion formed in the vicinity of the bearing portion, The drum may be a "drum for a cord winding device having a cord locking portion and a cord retaining portion that are arranged so that the end of the cord can pass straight and smoothly through the two through holes, and a gap formed between the cord locking portion and the cord retaining portion and the cord winding portion, and after the end of the cord is inserted from one through hole to the other through hole, the cord can be reinserted into the gap between the cord locking portion and the cord retaining portion and the cord winding portion, so that a slip-out prevention portion formed by tying the end of the cord, for example, can be fixed by the cord locking portion and the cord winding portion."

(5) In the drum for a cord winding device of the present invention, the axial retainer may have a claw to prevent the cord, which has been re-inserted into the gap formed between the cord hooking portion and the cord winding portion, from loosening and slipping out in the axial direction.
(6) The cord retaining portion may have a claw for preventing the cord, which has been re-inserted into the gap formed between the cord locking portion and the cord winding portion, from loosening and slipping out in the axial direction.
(7) In the drum for a cord winding device of the present invention, the two through holes formed in the cord winding section may be formed so as to expand in one of the circumferential directions, thereby providing space for positioning a cord slip-out prevention section.
(8) In the drum for a cord winding device of the present invention, the two through holes formed in the cord winding portion may be arranged 180 degrees apart from each other.
(9) In the drum for a cord winding device of the present invention, each of the holes formed in the cord winding portion may have an opening width that is 5 to 7 times the diameter of the cord to be inserted, or an opening width that has an arc length that is a minimum of 5.9% and a maximum of 25% of the circumference of the cord winding portion.

(1) In the drum for a cord winding device of the present invention configured as described above, the end of the cord is inserted from one through hole to the other through hole formed at a spaced position in the cord winding section, and then the cord is re-inserted into the gap between the outer surface of the cord locking portion and the inner surface of the cord winding section. This allows the anti-slip portion formed by tying the end of the cord to be fixed by the cord locking portion and the cord winding section, thereby providing a winding device that reduces the effort of assembly and maintenance.
Furthermore, since the through hole formed in the cord winding section is not the part that fixes the end of the cord, the opening width can be made significantly larger than the thickness of the cord so that the end of the cord can pass through easily, thereby achieving the above-mentioned effect.
Furthermore, it is also possible to simultaneously insert two strings through the holes formed in the drum, making it possible to more efficiently secure both ends of the string (one end or two ends) to the drum.
Furthermore, in the drum for a cord winding device of the present invention, it is possible to prevent a reduction in the amount of cord wound by the cord winding section, and to prevent the cord from being unable to be wound smoothly due to interference from the end of the cord.

(2) In the drum for a cord winding device of the present invention, the cord locking portion is formed as a circle with the same diameter as the inside of the cord winding portion, or a circle with a larger diameter than the inside of the cord winding portion, thereby shortening the distance between the cord locking portion and the inside of the cord winding portion, reliably capturing the portion that prevents the cord from slipping out, and making it easy to pass the cord through the center of the drum and difficult for the cord to slip out. Furthermore, it is possible to prevent the cord from interfering with the shaft or the other end of the cord.
Furthermore, a wide gap can be secured between the outer surface of the cord fastening portion and the inner surface of the cord winding portion.
(3) In the drum for a cord winding device of the present invention, when the cord engaging portion is a shaft holder consisting of a pair of arc-shaped protrusions formed at a distance from each other around the bearing portion and formed concentrically with the cord winding portion, the shaft holder does not get in the way when inserting the cord through the hole, the end of the cord can be fixed by the shaft holder, stable rotation of the drum can be obtained, and the cord can be effectively prevented from coming into contact with the shaft.
Furthermore, a wide gap can be secured between the outer surface of the cord locking portion and the inner surface of the cord winding portion, and the gap is uniform, making it easy to create a space that can easily accommodate even a relatively thick cord, and the cord can be stored smoothly.
(4) In the drum for a cord winding device of the present invention, the drum has a bearing portion formed in the center of the main body, a cylindrical cord winding portion arranged outside the bearing portion, and annular flange portions formed on both axial ends of the cord winding portion, and the drum further has two through holes formed at positions spaced apart from each other in the cord winding portion, the through holes having an opening width larger than a stopper portion formed by tying the ends of the cord so that the cord to be inserted can pass through smoothly, and a cord locking portion and a cord retaining portion formed in positions near the bearing portion. Therefore, when there is a cord locking portion and a cord holding portion arranged so that the end of the cord can pass straight and smoothly through the two through holes, and a gap formed between the outer surfaces of the cord locking portion and the cord holding portion and the inner surface of the cord winding portion, by inserting the end of the cord from one through hole to the other hole, and then re-inserting the cord into the gap between the cord locking portion and the cord holding portion, and the cord winding portion, the anti-slip portion formed by tying the end of the cord can be quickly, easily and reliably fixed by the cord locking portion and the cord winding portion.
Furthermore, the string retainer can prevent the string from interfering with the shaft.

(5) In the drum for a cord winding device of the present invention, if the shaft holder or the cord holder portion has a claw to prevent the cord, which has been reinserted into the gap formed between the cord locking portion and the cord winding portion, from loosening and slipping out in the axial direction, the claw can always prevent the cord from slipping out to the outside of the drum and causing the cord winding device to malfunction.
(6) In the drum for a cord winding device of the present invention, if the two through holes formed in the cord winding section are formed to expand in either circumferential direction and are capable of providing space for arranging a cord slip-out prevention section, this will increase the efficiency of space utilization of the drum, which is advantageous for making the drum smaller, and will prevent any problems with winding the cord by the drum.
(7) In the drum for a cord winding device of the present invention, if the two through holes formed in the cord winding section are positioned 180 degrees apart from each other, the end of the cord can be inserted straight through, making the task of fixing the cord to the drum extremely quick and simple.
Furthermore, the drum structure itself can be made to have a simple and stable shape that is point symmetrical, and can be easily manufactured and handled.
(8) In the drum for a cord winding device of the present invention, when each of the through holes formed in the cord winding section has an opening width that is 5 to 7 times the diameter of the cord to be inserted, or an opening width that has an arc length that is a minimum of 5.9% and a maximum of 25% of the circumference of the cord winding section, the cord can be inserted smoothly through the through holes, and the task of fixing the cord to the drum can be performed very quickly and easily.
The reason why the minimum is set to 5.9% is that in the most general embodiment, when the cord has a wire diameter of about 1 mm, a minimum through hole of 1.5 mm is required. Calculating from this, the minimum is 5.9%.
The reason for setting the maximum at 25% is that in the most general embodiment, when ensuring the amount of cord winding and taking into account the strength of the cord winding section, it can be determined that at least half the circumference is necessary for the cord winding section.
Furthermore, it is possible to avoid a decrease in the strength of the drum and a decrease in the amount of string that can be wound up.

FIG. 1 is a bottom view and a cross-sectional view seen from the bottom of a drum for a shoelace winding device in one embodiment in which the present invention is embodied in a drum for a shoelace winding device, and shows the procedure for inserting the lace through a through hole formed in the drum and fixing the lace to the drum. FIG. 2 is an exploded perspective view of a shoelace winding device equipped with a drum for a shoelace winding device according to one embodiment of the present invention. FIG. 3 is a six-view diagram of a drum for a shoelace winding device according to one embodiment of the present invention, and a cross-sectional diagram of the drum cut in the diameter direction. FIG. 4 is a cross-sectional view seen from the bottom side of a drum for a shoelace winding device in one embodiment in which the present invention is embodied in a drum for a shoelace winding device, and is a diagram for explaining the diameter of the lace locking portion. 5(A) to 5(C) are cross-sectional views of a drum for a shoelace winding device as seen from the bottom side in accordance with another embodiment of the present invention, and a cross-sectional view of the drum as seen from the bottom side showing the state in which a lace is fixed to the drum. FIG. 6 is a bottom view and a cross-sectional view of a drum for a shoelace winding device as seen from the bottom side, showing still another embodiment in which the present invention is embodied in the drum for a shoelace winding device. 7A to 7D are bottom views of a drum for a shoelace winding device according to yet another embodiment of the present invention, and cross-sectional views of the drum as viewed from the bottom, showing the steps for fixing the lace to the drum.

The present invention relates to a drum for a cord winding device, the drum having a bearing portion formed in the center of the main body, a cylindrical cord winding portion arranged outside the bearing portion, and annular flange portions formed on both axial ends of the cord winding portion, the drum having two through holes formed at spaced positions on the cord winding portion, the through holes having an opening width larger than a stop portion formed by tying an end of the cord, etc., so that the cord to be inserted can pass through smoothly, and a cord locking portion formed at a peripheral position of the bearing portion, the cord locking portion arranged so that the end of the cord can pass straight and smoothly through the two through holes, and a gap formed between the cord locking portion and the cord winding portion, the end of the cord being inserted from one through hole to the other through hole, and then the cord being reinserted through the gap between the cord locking portion and the cord winding portion, so that the stop portion formed by tying the end of the cord, etc., can be fixed by the cord locking portion and the cord winding portion" or "a drum for a cord winding device, the drum having a bearing portion formed in the center of the main body, and an annular flange portion formed on the outer side of the bearing portion a cord winding device drum having a cylindrical cord winding section placed in a position adjacent to the bearing section and annular flange sections formed on both axial ends of the cord winding section, the cord winding section having two through holes formed at spaced positions on the cord winding section, the through holes having an opening width larger than a stop section formed by tying an end of the cord, etc. so that the cord to be inserted can pass through smoothly, and a cord locking section and cord holding section formed in the vicinity of the bearing section, the cord locking section and cord holding section being arranged so that the end of the cord can pass straight and smoothly through the two through holes, and a gap formed between the cord locking section and cord holding section and the cord winding section, the cord being configured such that after the end of the cord is inserted from one through hole to the other, the cord can be re-inserted into the gap between the cord locking section and cord holding section, and the cord winding section, so that the stop section formed by tying the end of the cord, etc. can be fixed by the cord locking section and the cord winding section, and the drum can be suitably embodied by the embodiments described below.

Hereinafter, an embodiment of a drum for a shoelace winding device according to the present invention that can be used to tighten a shoelace will be described with reference to FIGS. 1 to 3.
The internal configuration of the cord winding device corresponding to the following embodiment and its effects are also disclosed in Japanese Patent Application No. 2013-127574 (JP Patent Publication No. 2015-293) and Japanese Patent Application No. 2016-157594 (JP Patent Publication No. 2018-23614), etc.
Furthermore, the drum for a string winding device of the present invention can be utilized as a drum or reel for use in many string winding devices that have been proposed in the past.

The shoelace winding device 1 is composed of a base member 2 that is fixed to a shoe, a shoelace winding device drum 4 for winding up the shoelace 3, a roughly disk-shaped dial 5 for rotating the drum 4, a shaft member 6 that is rotatably fixed to the base member 2 in order to attach the dial 5 to the base member 2, and a spring member 7 whose one end is journalled by the shaft member 6.
Here, the shoelace 3 given as an example of a lace can be suitably a braided lace having excellent strength and made of ultra-high molecular weight polyethylene fibers, polyester fibers, nylon fibers, or the like, but it may also be a multifilament or monofilament lace (including a wire-like one) made of other resins or metals.
A specific example of the diameter of the shoelace 3 is a braided cord having a diameter of about 0.9 mm to 1.1 mm in the case of the embodiment shown in FIGS. 1 to 3 in which the outer diameter of the lace winding portion 42 described below is about 1.3 cm.
The material of the drum 4 for the cord winding device is not limited to the following, but POM (polyacetal), nylon, polycarbonate, ABS, etc. can be suitably used.
The end of the shoelace 3 is formed with a slip-off prevention portion 31 that acts as an anchor.

The base member 2 has a cylindrical drum storage section 21 with a bottom, and a columnar rotation shaft 22 for rotatably supporting the shoelace winding device drum 4 is provided protruding from the center of the bottom thereof.
In addition, two shoelace outlets 23 are formed at the bottom of the drum storage section 21, and these shoelace outlets 23 are located at positions spaced apart from each other by approximately 100 degrees around the rotation shaft 22.
Furthermore, three ratchet pawls 24 are formed at equal intervals at the upper end of the drum storage portion 21 and protrude outward.

The drum 4 for the shoelace winding device has a bearing portion 41 formed in a circular shape that penetrates the center of the main body, a cylindrical lace winding portion 42 arranged on the outside of the bearing portion 41, and annular flange portions 43 formed on both axial ends of the lace winding portion 42.
Furthermore, the drum 4 for the shoelace winding device has two through holes 44 formed (radially) in the lace winding part 42 at positions spaced 180 degrees from each other around the bearing part 41, and lace locking parts 45 formed at peripheral positions of the bearing part 41 such that the shoelace 3 can pass through the two through holes 44; and a gap S formed between the outer surface of the lace locking parts 45 and the inner surface of the lace winding part 42.
Furthermore, in this embodiment, by forming the lace locking portion 45 as a circle with the same diameter as the inside of the lace winding portion 42 (circle C1 shown in FIG. 4A) or as a circle with a larger diameter than the inside of the lace winding portion 42 (circle C2 shown in FIG. 4A), the distance between the lace locking portion and the inside of the lace winding portion is shortened, and the anti-slip portion 31 of the shoelace 3 is reliably caught, and the shoelace 3 can be easily threaded through the center of the drum 4, making it difficult for the shoelace 3 to slip out. Furthermore, it is also possible to prevent the shoelace 3 from interfering with the rotating shaft 22 or the other end of the shoelace 3.

Here, the through hole 44 preferably has an opening width that is 3 to 7 times the diameter of the shoelace 3 to be passed through, or an opening width that has an arc length that is a minimum of 5.9% and a maximum of 25% of the circumference of the lace winding portion 42. More preferably, the through hole 44 has an opening width that is 5 to 7 times the diameter of the shoelace 3 to be passed through.
Furthermore, if the opening width is too large, it will reduce the strength of the drum and the amount of string that can be wound up, and if it is too small, it will be difficult to pass the string through, or the task of passing the string through itself will be difficult.
Therefore, in the embodiment of the drum 4 for a shoelace winding device shown in Figure 1, the opening width of each through-hole 44 is approximately 5 to 7 times the diameter of the shoelace 3 to be inserted, and has an opening width with an arc length of approximately 18% of the circumference of the lace winding portion 42 (an angle of approximately 65 degrees).
Furthermore, the two through holes 44 are not only formed at positions corresponding to the central lines of the drum 4 through which the shoelace 3 is inserted (the left-right lines at 3 o'clock and 9 o'clock in the figure), but are also extended to extend in one of the circumferential directions (the directions of 2 o'clock and 8 o'clock in the figure, respectively).

Therefore, by fitting the anti-slip portion 31 formed at one end of the shoelace 3 into the expanded portion of the through-hole 44 as described above, there is no interference on the line at the center of the drum, and the other end of the shoelace 3 can be smoothly inserted through the through-hole 44.
Furthermore, not only can it be prevented that the shoelace 3 cannot be smoothly wound up due to interference from the end of the shoelace 3, but since the portion where the shoelace 3 is pulled out from the drum 4 is wide and spacious, it is possible to prevent the shoelace 3 from being strongly bent (kinked) at the portion where it is pulled out from the drum 4, and thus prevent the shoelace from breaking.

The rotating shaft 22 of the base member 2 is inserted into the bearing portion 41, making the shoelace winding device drum 4 rotatable within the drum storage portion 21.
A recess 46 is formed on both the upper and lower surfaces of the drum 4 for the shoelace winding device, between the lace winding portion 42 and the bearing portion 41. The recess 46 formed on the underside of the drum 4 faces the inner bottom portion of the drum storage section 21 and is provided with the two lace locking portions 45.

In the drum 4 for a shoelace winding device of this embodiment of the present invention, the lace locking portion 45 is configured as part of a shaft holder consisting of a pair of arc-shaped protrusions formed 180 degrees apart from each other around the bearing portion 41, and is configured and arranged to form a circle C1 of the same diameter as the inside of the lace winding portion 42.
Therefore, the distance between the lace locking portion 45 and the inner surface of the lace winding portion 42 is shortened, the slip-off prevention portion 31 of the shoelace 3 is securely caught, and the shoelace 3 can be easily threaded through the center of the drum 4 while being less likely to slip off.
The inner peripheral surface of this shaft retainer contacts the rotating shaft 22, providing stable rotation of the drum 4.
The positions where the string locking portions 45 are formed, i.e., the portions which act as the string locking portions of the present invention, are both end portions of the shaft holder and in the vicinity of the ends of the through-holes 44 .

On the other hand, the recess 46 formed on the upper side of the drum 4 faces the dial 5 and has a plurality of upwardly facing teeth 47 arranged in a ring shape along the inner circumferential surface of the string winding portion 42.
The upward teeth 47 mesh with downward teeth formed in a ring shape on the underside of the dial 5, thereby enabling the rotation of the dial 5 to be transmitted to the drum 4.
The lace retaining portion 45 has a pawl 48 for preventing the shoelace 3 that has been reinserted (placed) in the gap S formed between the lace retaining portion 45 and the lace winding portion 42 from loosening and slipping out in the axial direction.
The claw 48 is formed to protrude outward from the upper end of the string locking portion (shaft retainer) 45 so as to partially cover the gap S.

In the drum 4 for a shoelace winding device of this embodiment of the present invention configured as described above, the end of the shoelace 3 is inserted so that it passes straight through the center of the drum body in the diametric direction from one of the through holes 44 to the other through hole 44, and then the shoelace 3 is reinserted into the gap S between the lace locking portion (shaft holder) 45 and the lace winding portion 42, so that the slip-out prevention portion 31, which is a thick portion formed by tying the end of the shoelace 3, is sandwiched and fixed between the lace locking portion 45 formed near the end of the through hole 44 and the lace winding portion 42.

The dial 5 has an axial hole 51 in its center, and the downward teeth are formed around the periphery of the axial hole 51. Furthermore, the dial 5 has an annular gear arranged cylindrically on the inner surface of its periphery, the annular gear having a plurality of ridges and valleys extending in the direction of the rotation axis of the dial 5.
The valleys of this ring gear and the ratchet pawls 24 are arranged to mesh with each other, and when the dial 5 is rotated, the ratchet pawls 24 climb over the peaks of the ring gear, thereby controlling the rotation of the dial 5 so that it can only be rotated in one direction.

Furthermore, the dial 5 is movable along its rotation axis, and can realize a locked state in which the upward teeth 47 and the downward teeth mesh to transmit the rotation of the dial 5 to the drum 4, and a released state in which the upward teeth 47 and the downward teeth separate to separate the drum 4 from the dial 5 so that the drum 4 can rotate freely.

The shaft member 6 is fixed to the base member 2 by a screw 8 so as to rotatably mount the dial 5 relative to the base member 2, and is adapted to hold and guide the dial 5 in a movable state between a locked position in close proximity to the drum 4 and an unlocked position away from the drum 4.
The spring member 7 enables the drum 4 to be switched from a locked state to a released state by the dial 5 moving from a locked position to a released position.
In addition, a disk-shaped cover member 9 is fitted onto the upper side of the dial 5 to protect the inside of the shoelace winding device 1 and prevent dust and other foreign matter from entering.

Next, a method for fixing the end of the shoelace 3 to the drum 4 for the shoelace winding device described above and assembling the shoelace winding device 1 will be described.
First, in order to attach the drum 4 to the base member 2 of the shoelace winding device 1, the ends of the shoelace 3 are inserted into the two shoelace withdrawal openings 23, and both ends of the shoelace 3 are pulled out from the drum storage section 21 side.
Then, as shown in FIG. 1 , the tip of the shoelace 3 is inserted from one through hole 44 of the drum 4 to the other through hole 44, and the tip of the shoelace 3 is knotted, or an anchor made of a separate member is crimped to the tip of the shoelace 3, thereby forming a large-diameter anti-slip portion 31 at the tip of the shoelace 3.

Next, the shoelace 3 is reinserted (inserted) into the gap S between the outer surface of the lace locking portion (shaft retainer) 45 and the inner surface of the lace winding portion 42, so that the slip-out prevention portion 31 of the shoelace 3 is fixed by being sandwiched between the lace locking portion 45 and the lace winding portion 42.

Next, the other end of the shoelace 3 is inserted from the through hole 44 on the opposite side of the drum 4 to the other through hole 44, and the end of the shoelace 3 is tied, or an anchor of a separate member is crimped to the end of the shoelace 3 to form a slip-out prevention portion 31 at the end of the shoelace 3.
Next, the shoelace 3 is re-inserted (inserted) so that it is positioned in the gap S between the inner surface of the lace locking portion (shaft holder) 45 on the opposite side and the outer surface of the lace winding portion 42, whereby the slip-out prevention portion 31 of the shoelace 3 is fixed by being sandwiched between the lace locking portion 45 and the lace winding portion 42.
Alternatively, a procedure may be adopted in which the anti-slip portion 31 is formed in advance at the tip of the shoelace 3, and the tip of the shoelace 3 is then inserted through both through holes 44.

By adopting the above-described method, the task of fixing the ends of the shoelace 3 to the drum 4 can be completed extremely quickly, easily and reliably.
After both ends of the shoelace 3 are fixed to the drum 4 as described above, the drum 4 is placed in the drum storage section 21, and the shaft member 6 to which the spring member 7 is attached is fixed to the rotating shaft 22 with a screw 8, thereby attaching the dial 5 to the base member 2 and attaching the cover member 9 to the dial 5.

Next, another embodiment of the drum for a cord winding device according to the present invention will be described.
In the embodiment of the drum 4 shown in Figures 5(A) to (C), the two through holes 44 formed in the lace winding part 42 are formed so as to expand in one of the circumferential directions, thereby providing a space for arranging the slip-off prevention part 31 of the shoelace 3.
The cord locking portion 45 is a shaft holder consisting of a pair of arc-shaped projections spaced apart from each other around the bearing portion 41, and is formed concentrically with the cord winding portion 42 (see circle C3 in FIG. 4B). The diameter of this circle C3 is smaller than the diameter of the circle that constitutes the inner surface of the cord winding portion 42.
In other words, the two through holes 44 are not only formed at positions corresponding to the central lines of the drum 4 through which the shoelace 3 is inserted (the left-right lines at 3 o'clock and 9 o'clock in the figure), but are also extended to extend in one of the circumferential directions (the directions of 2 o'clock and 8 o'clock in the figure, respectively).
Furthermore, in the embodiment shown in Figure 5 (B), a recess 45a is formed in the string locking portion (shaft retainer) 45 at a position corresponding to the portion where the through hole 44 is expanded circumferentially, so that the anti-slip portion 31 fits into that portion.
In the embodiment shown in FIG. 5C, the thickness of each shaft holder is formed to be thin, and a separate string locking portion 45 is provided protruding from one end of each shaft holder (at a position 180 degrees apart).
Therefore, even if the gap S between the shaft holder in the portion where the lace locking portion 45 is not formed and the lace winding portion 42 is wide, the slip-out prevention portion 31 of the shoelace 3 can be fixed.

The embodiment of the drum 4 shown in FIG. 6 has a lace locking portion 45 and a lace retaining portion 49 formed 180 degrees apart in the vicinity of the bearing portion 41, and positioned so that the shoelace 3 can pass smoothly through the center of the main body through the two through holes 44 without hindrance, as shown by the arrows in the figure.
In this embodiment, the shaft holder in contact with the rotating shaft 22 is omitted, and the lace holder 49 serves to prevent the shoelace 3 from touching the rotating shaft 22.
Also in this embodiment, a gap S is formed between the outer surfaces of the lace locking portion 45 and lace retainer portion 49 and the inner surface of the lace winding portion 42. After inserting the end of the shoelace 3 straight from one of the through holes 44 to the other of the through holes 44, the shoelace 3 can be re-inserted (inserted) into the gap S, whereby the anti-slip portion 31 formed by tying the end of the shoelace 3, for example, can be sandwiched and fixed between the lace locking portion 45 and the lace winding portion 42.
In order to form the slip-off prevention portion 31 at the end of the shoelace 3, a single knot or crimping with a metal fitting or the like can be used.

In the embodiment of the drum 4 shown in FIG. 7, unlike the other embodiments, the positions at which the two through holes 44 are formed are close to each other (approximately between 10 o'clock and 12 o'clock and between 7 o'clock and 9 o'clock in the figure).
As in the embodiment shown in FIG. 6, the shoelace has a lace locking portion 45 and a lace retaining portion 49 formed in the vicinity of the bearing portion 41 and positioned so that the lace 3 can pass through the two through holes 44.
6, the positions of the string hooking portion 45 and the string retaining portion 49 are not formed at positions spaced 180 degrees apart from each other.
However, the lace locking portion 45 is formed near the end of the through hole 44, so that the anti-slip portion 31 of the shoelace 3 can be fixed by being sandwiched between the lace locking portion 45 and the lace winding portion 42.
As in the other embodiments, the opening width of each through hole 44 is about 5 to 7 times the diameter of the shoelace 3 to be inserted, and has an opening width with an arc length of about 18% of the circumference of the lace winding portion 42 (an angle of about 65 degrees).

The present invention may be embodied and implemented as a drum for a string winding device for winding strings other than shoelaces (for example, but not limited to, strings for bags or purses, hat strings, clothing strings, strings for medical instruments, etc.), and the shape, dimensions, angles, installation positions, sizes, numbers, etc. of each part may be appropriately modified and implemented without departing from the spirit of the present invention.
For example, in the present invention, the through holes 44 may be formed symmetrically only in the 3 o'clock and 9 o'clock directions in the figure, without expanding in either circumferential direction.
The present invention may also be utilized as a drum to which only one end of the string is secured.

The present invention can be used industrially as a drum for a string winding device that is easy to use for fixing the string.

1 Shoelace winding device as an example of a lace winding device 2 Base member 21 Drum storage section 22 Rotating shaft 23 Shoelace pull-out opening 24 Ratchet pawl 3 Shoelace (lace)
31: Anti-slip portion 4: Drum for shoelace winding device (drum or reel)
41 Bearing portion 42 Cord winding portion 43 Flange portion 44 Through hole 45 Cord locking portion (shaft holder)
45a: recess 46: concave portion 47: upward tooth 48: claw 49: string retainer 5: dial 51: shaft hole 6: shaft member 7: spring member 8: screw 9: cover member S: gap C1: circle with the same diameter as the inner surface of the string winding portion C2: circle with a larger diameter than the inner surface of the string winding portion C3: circle with a smaller diameter than the inner surface of the string winding portion

Claims (9)

A bearing portion formed in the center of the main body;
A cylindrical string winding portion disposed outside the bearing portion;
Annular flange portions formed on both axial ends of the cord winding portion;
A drum for a string winding device having
two through holes formed at spaced positions in the cord winding section , the through holes having an opening width larger than a stopper portion formed by tying the end of the cord so that the cord to be inserted can pass through smoothly;
a string locking portion formed at a peripheral position of the bearing portion, the string locking portion being arranged so that the ends of the string can pass straight and smoothly through the two through holes;
A gap formed between the cord hooking portion and the cord winding portion;
having
A drum for a cord winding device, characterized in that after the end of the cord is inserted from one of the through holes to the other, the cord is re-inserted into the gap between the cord locking portion and the cord winding portion, so that the anti-slip portion formed by tying the end of the cord, for example, can be fixed by the cord locking portion and the cord winding portion. The drum for a cord winding device according to claim 1, characterized in that the cord locking portion is a shaft retainer consisting of a pair of arc-shaped protrusions formed at a distance from each other around the bearing portion, and is formed as a circle with the same diameter as the inside of the cord winding portion or a circle with a larger diameter than the inside of the cord winding portion. The drum for a cord winding device according to claim 1, characterized in that the cord locking portion is a shaft retainer consisting of a pair of arc-shaped protrusions formed at a distance from each other around the bearing portion, and is formed concentrically with the cord winding portion. A bearing portion formed in the center of the main body;
A cylindrical string winding portion disposed outside the bearing portion;
Annular flange portions formed on both axial ends of the cord winding portion;
A drum for a string winding device having
two through holes formed at spaced positions in the cord winding section , the through holes having an opening width larger than a stopper portion formed by tying the end of the cord so that the cord to be inserted can pass through smoothly;
a cord locking portion and a cord retaining portion formed in the vicinity of the bearing portion, the cord locking portion and the cord retaining portion being arranged so that the ends of the cord can pass straight and smoothly through the two through holes;
A gap is formed between the cord locking portion and the cord retaining portion and the cord winding portion;
having
A drum for a cord winding device, characterized in that after the end of the cord is inserted from one through hole to the other, the cord is re-inserted through the gap between the cord locking portion and the cord holding portion and the cord winding portion, so that the anti-slip portion formed by tying the end of the cord, for example, can be fixed by the cord locking portion and the cord winding portion. The drum for a cord winding device according to claim 2 or 3, characterized in that the axial retainer has a claw for preventing the cord, which has been reinserted into the gap formed between the cord hooking portion and the cord winding portion, from loosening and slipping out in the axial direction. The drum for a cord winding device according to claim 4, characterized in that the cord retaining portion has a claw for preventing the cord, which has been re-inserted into the gap formed between the cord hooking portion and the cord winding portion, from loosening and slipping out in the axial direction. A drum for a cord winding device as described in any one of claims 1 to 6, characterized in that the two through holes formed in the cord winding section are formed to expand in one circumferential direction, thereby providing space for arranging a cord slip-out prevention section. The drum for a cord winding device according to any one of claims 1 to 7 , characterized in that the two through holes formed in the cord winding portion are arranged 180 degrees apart from each other. A drum for a cord winding device as described in any one of claims 1 to 8, characterized in that each through hole formed in the cord winding portion has an opening width that is 5 to 7 times the diameter of the cord to be inserted, or an opening width that has an arc length that is at least 5.9% and at most 25% of the circumference of the cord winding portion.

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