WO2020184818A1 - 캐스터 및 그 제조 방법 - Google Patents
캐스터 및 그 제조 방법 Download PDFInfo
- Publication number
- WO2020184818A1 WO2020184818A1 PCT/KR2019/017953 KR2019017953W WO2020184818A1 WO 2020184818 A1 WO2020184818 A1 WO 2020184818A1 KR 2019017953 W KR2019017953 W KR 2019017953W WO 2020184818 A1 WO2020184818 A1 WO 2020184818A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wheel
- caster
- core
- bushing
- buffer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general ; Anti-clogging castors
- B60B33/0028—Construction of wheels; methods of assembling on axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general ; Anti-clogging castors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B33/00—Castors in general ; Anti-clogging castors
- B60B33/0047—Castors in general ; Anti-clogging castors characterised by details of the rolling axle
Definitions
- the present invention relates to a caster and a method of manufacturing the same, and more specifically, as a caster of a lightweight structure used for a small and medium-sized freight transport vehicle, the caster is double-injected by using a hard synthetic resin and a soft synthetic resin having excellent bonding strength.
- the present invention relates to a caster and a method of manufacturing the same, which prevents separation of the core and the wheel by forming a core and a wheel coupled to the outside of the core, while simplifying the caster manufacturing process.
- carts are used to conveniently transport various items in trains, aircraft, hospitals, airports and wharf waiting rooms, large discount marts, hotels, and the like, and are used in various places.
- a plurality of support rods are installed on the upper part of the support member of the bogie, and a handle is installed in the front so that the operator can push the bogie, and a plurality of casters formed to surround the caster at the lower part of the support member Housing (fixing material) is installed.
- the caster is coupled to the caster housing so as to be rotatable by a rotation shaft inserted in the center, and by this configuration, the caster in the caster housing rotates around the rotation axis when the operator pushes the handle of the truck. do.
- Patent Document 1 In the case of casters according to the prior art disclosed in the following [Patent Document 1], most of them are made of a form in which a wheel made of urethane material is coupled to the outer circumferential surface of a disc-shaped core made of a hard polypropylene (PP) material. Due to the characteristics of the urethane material, the impact resistance is low and the wheel breaks or the outer shell of the wheel is peeled off after a certain period of time, and the low bonding strength between the polypropylene (PP) material constituting the core and the urethane material constituting the wheel is used for a long time. There was a problem that the core and the wheel were peeled off during use.
- PP polypropylene
- the external force applied to the caster in a direction perpendicular to the ground by the load of the article placed on the support member is transmitted to the core made of polypropylene (PP) through the wheel made of urethane. Due to the transmission structure, there is also a problem that stable rotation of the caster is not achieved due to deformation or breakage of the central portion of the core coupled to the rotating shaft.
- PP polypropylene
- the present invention is to solve the problems of the prior art as described above, and an object of the present invention is to be bonded to the core of the caster and the outside of the core by double injection by using a hard synthetic resin and a soft synthetic resin having excellent bonding strength to each other. It is to provide a caster capable of simplifying the caster manufacturing process while preventing the separation of the core and the wheel by forming each wheel, and a method of manufacturing the same.
- another object of the present invention is to provide a caster and a manufacturing method for increasing the impact resistance by forming a buffer structure on both sides of the wheel to alleviate the impact received by the caster by the weight of the bogie.
- another object of the present invention is to receive a load by forming a support protrusion protruding in a disk shape in an outward direction at the center of the outer peripheral surface of the core so that the hard support protrusion is embedded in the inside of a relatively soft wheel. It is to provide a caster capable of improving the balance and stability of a bogie by minimizing the deformation of the wheel in the process of rotating the caster in the state and a method of manufacturing the same.
- the caster according to the present invention is a bushing made of a hollow pipe-shaped metal material, a core coupled to surround the outer circumferential surface of the bushing and made of a hard synthetic resin material, an elastomer coupled to surround the outer circumferential surface of the core and softer than the hard synthetic resin It includes a wheel made of (elastomer) material, wherein the wheel is characterized in that the buffer through holes are formed on both sides.
- a plurality of buffer through-holes of the wheel are arranged in a circumferential direction around a rotation axis inserted in the bushing in a longitudinal direction.
- the wheel has a plurality of first spiral grooves arranged in a spiral shape around the rotation axis on one side, and a plurality of second spiral grooves arranged in a spiral shape around the rotation axis on the other side.
- the first spiral groove and the second spiral groove are formed in opposite directions to each other, and the buffer through hole is formed in a portion where the first spiral groove and the second spiral groove cross each other.
- the wheel is characterized in that the ring-shaped grooves are formed on both side surfaces, and the buffer through-holes are formed on the grooves.
- a disk-shaped support protrusion protruding outward along a circumferential direction is formed in the center of the outer circumferential surface of the core, and the support protrusion is embedded in the wheel along the circumferential direction, or a part of the outer end through the buffer through hole is external It is characterized by being exposed to.
- the caster manufacturing method comprises the steps of manufacturing a hollow pipe-shaped bushing using a metal material, and injecting a hard synthetic resin material into the interior of the first injection mold while receiving the manufactured bushing, Injecting an elastomer material softer than the hard synthetic resin in the first injection step of forming a core in a shape surrounding the outer circumferential surface of the bushing in an annular shape, while receiving the manufactured core inside the second injection mold, Including a secondary injection step of forming a wheel in a shape surrounding the outer circumferential surface of the core in an annular shape, wherein a plurality of buffering through holes arranged in a circumferential direction around a rotation axis inserted in the longitudinal direction into the bushing are formed on both sides of the wheel It features.
- the caster and its manufacturing method according to the present invention form a wheel that is coupled to the core of the caster and the outside of the core by double injection by using a hard synthetic resin and a soft elastomer having excellent bonding strength to each other. By doing so, there is an effect of simplifying the caster manufacturing process while preventing the separation of the core and the wheel.
- the caster and its manufacturing method according to the present invention protect the core and the bushing inside the caster by buffering the stress applied to the caster by the weight of the bogie by the buffer through holes and grooves formed on both sides of the wheel. It maintains the position, and additionally has the effect of increasing the impact resistance and elasticity of the entire wheel by the elasticity inherent in the wheel material and the elastic restoring force by the shape of the buffer through hole.
- the caster and its manufacturing method according to the present invention are configured to form a support protrusion protruding in a disk shape in an outward direction at the center of the outer peripheral surface of the core so that the hard support protrusion is embedded in the inside of a relatively soft wheel.
- FIG. 1 is a view showing a caster and a manufacturing method thereof according to a first embodiment of the present invention
- Figure 2 is a cross-sectional perspective view showing a deformed state of the caster shown in Figure 1, and
- FIG 3 is a view showing a caster according to a second embodiment of the present invention.
- FIG. 1 is a view showing a caster according to a first embodiment of the present invention and a method of manufacturing the same
- FIG. 2 is a cross-sectional perspective view showing a deformed state of the caster shown in FIG. 1
- FIG. 3 is a second embodiment of the present invention.
- the caster according to the first embodiment of the present invention includes a bushing 101 made of a hollow pipe-shaped metal material, and a core 102 coupled to the outer circumferential surface of the bushing. And a structure of the wheel 103 coupled to the outer circumferential surface of the core 102.
- the caster according to the first embodiment of the present invention includes a bushing 101 made of a metal material in the shape of a hollow pipe into which the rotation shaft of the caster is inserted.
- the bushing 101 is made of a metal material having high strength and excellent corrosion resistance in order to minimize the influence of the external environment such as the weight of the bogie, external impact, and moisture on the rotating shaft of the caster.
- the material of the bushing 101 for example, a metal such as brass, bronze, or stainless steel (ST), which is referred to as brass, may be used, and by using such a material, the weight, external impact and moisture of the bogie By minimizing the influence of the external environment such as such on the rotating shaft of the caster, it is strong against deformation and corrosion, thereby providing structural stability of the bogie.
- a metal such as brass, bronze, or stainless steel (ST)
- ST stainless steel
- the caster according to the present invention has the advantage of preventing the core from being damaged by the load because the rotation shaft on which the load is concentrated is not directly coupled to the core, but is coupled through a metal bushing. .
- FIG. 1B shows the core 102 coupled to the outside of the bushing 101 so as to surround the outer circumferential surface of the metal bushing 101 in an annular shape. Since the core 102 has a structure surrounding the bushing 101 to which the rotation shaft is coupled, it must be formed of a hard material that does not deform from external impact or stress so as to facilitate rotation of the caster.
- a hard synthetic resin material such as polypropylene (PP), polyethylene (PE), polystyrene (PS), polycarbonate (PC), etc. may be used as the material of the core 102.
- the core 102 is made of polypropylene (PP) material.
- the caster according to the first embodiment includes a wheel 103 coupled to surround the outer circumferential surface of the core 102 in an annular shape, in the present invention, the wheel ( As the material of 103), an elastomer that is relatively soft and has excellent bonding strength with the hard synthetic resin is used.
- the elastomer material used for the wheel 103 is an eco-friendly material compared to urethane, which is a conventional wheel material, and can be regenerated, and because there is no deformation such as hardening over time, it is broken or the skin is peeled even when used for a long time. It can prevent the phenomenon, and has the advantage of being able to easily adjust the hardness as needed during manufacture.
- the elastomer material has excellent elasticity and is relatively soft, it has the advantage of improving the impact resistance and elasticity of the caster, and has excellent bonding strength with a hard synthetic resin (polypropylene in this embodiment), even when used for a long time. There is an advantage that can prevent the phenomenon of peeling off.
- the present invention has a structure in which buffer through holes 104 are formed on both sides of the wheel 103.
- the cushioning through-hole 104 of the wheel 103 has a structure in which a plurality of through-holes 104 are arranged in a circumferential direction around a rotation axis inserted in the bushing 101 in the longitudinal direction.
- the stress applied to the caster is buffered in the buffer through hole 104 of the wheel 103 so that the core 102 inside the caster It has a function of protecting the and bushing 101 and maintaining the position of the rotating shaft.
- the wheel 103 has an effect of increasing the elasticity of the wheel 103 or the caster by the elasticity inherent in the elastomer, which is a wheel material, and the elastic restoring force by the shape of the buffer through hole 104.
- the wheel 103 may further include ring-shaped grooves 103a on both sides thereof, and the buffer through-hole 104 may be formed on the grooves 103a. Accordingly, the stress applied to the caster may be buffered by the recessed portion 103a as well as the buffer through-holes 104 formed on both sides of the wheel 103.
- a disk-shaped support protrusion 105 protruding outward along the circumferential direction is formed in the center of the outer peripheral surface of the core 102.
- the support protrusion 105 is configured to be embedded in the soft elastomer wheel 103 along the circumferential direction during injection molding by double injection or the like, as described later.
- the caster according to the present invention has a hardened support protrusion 105 inside the wheel 103 even when a wheel made of a relatively soft elastomer material is deformed by the load of the bogie or an external impact. Since it performs the same function as a rib, there is an advantage in that the caster can be rotated stably by limiting the deformation of the wheel 103.
- the support protrusion 105 is configured such that a portion of the outer end portion of the wheel 103 in which the buffer through hole 104 is formed is exposed to the outside through the buffer through hole 104 along the circumferential direction.
- the caster according to the present invention has the support protrusion exposed to the outside as shown in FIG. 2 when the cushioning through hole 104 formed in the wheel 103 is deformed by the load of the bogie or an external impact.
- the outer end of the buffer 105 prevents the buffer through hole 104 from being completely deformed by performing a function like a stopper that limits the deformation range of the wheel 103 (specifically, the buffer through hole). This ensures that the caster can rotate stably.
- the caster manufacturing method of the present invention first includes the step of manufacturing a hollow pipe-shaped bushing 101 using a metal material as shown in FIG. 1A.
- the bushing 101 has a structure in which a hollow is formed in the center portion in the longitudinal direction in order to fit the rotation shaft of the caster.
- a polypropylene (PP) material is injected into the bushing 101.
- PP polypropylene
- a plurality of buffer through holes 104 arranged in a circumferential direction around a rotational shaft inserted in the longitudinal direction into the bushing 101 are formed on both sides of the wheel.
- first injection step and the second injection step may be performed as separate processes, but may be performed as a continuous process.
- the present invention caster manufacturing method simplifies the manufacturing process of a caster including a metal bushing, a hard synthetic resin core, and an elastomer wheel through an insert injection or double injection method, and maximizes mutual coupling capability. Through this, the wheel and the core are not separated and the elastic force of the wheel is stably maintained.
- FIG. 2 is a cross-sectional perspective view of the caster shown in FIG. 1.
- the wheel 103 is characterized in that the ring-shaped grooves 103a are formed on both sides of the wheel 103, and the buffer through-hole 104 is formed on the grooves 103a.
- the concave portion 103a has a function of protecting the core 102 and the bushing 101 inside the caster by buffering the stress applied to the caster together with the buffer through hole 104 and maintaining the position of the rotation shaft.
- the core 102 has a structure in which a disk-shaped support protrusion 105 protruding outward in a circumferential direction is formed in the center of the outer circumferential surface, and the support protrusion 105 is the wheel along the circumferential direction as described above. It is embedded in or is characterized in that a part of the outer end is exposed to the outside through the buffer through hole 104.
- the wheel 103 and the buffer through hole 104 on the wheel may be deformed in the direction of the arrow by an external force applied to the wheel 103.
- the size of the deformation is limited to be deformed only up to the dotted line shown in FIG. 2 by the support protrusion 105 formed on the core 102, thereby providing stability of the balance of the balance.
- FIG 3 is a view showing a caster according to a second embodiment of the present invention.
- the caster according to the second embodiment of the present invention has the structure of the bushing 201, the core 202, and the support protrusion 205 formed on the core 202, and the wheel 203 in the same manner as the first embodiment of the present invention.
- the shape of the buffer through hole is different.
- the caster wheel 203 has a plurality of first spiral grooves 211 arranged in a spiral shape around the rotation axis on one side, and the other side A plurality of second spiral grooves 212 are formed in a spiral shape around the rotation axis.
- first spiral groove 211 and the second spiral groove 212 are formed in opposite directions in a spiral direction
- the buffer through hole includes a first spiral groove 211 and a second spiral groove 212 It is characterized in that it is formed at a portion intersecting each other.
- the buffer through-hole may be formed on the concave portion of the wheel 203 in the same manner as in the first embodiment.
- the impact resistance through the cushion role may be increased by the spiral grooves 211 and 212 where one side and the other side intersect each other, the groove portion and the buffer through hole. .
- spiral grooves 211 and 212 have a function of preventing torsional deformation due to an external impact due to an external impact as the spiral grooves 211 and 212 are formed opposite to each other, and the elastic force inherent to the wheel material and the shape of the spiral grooves 211 and 212 There is an effect of increasing the elastic force of the entire wheel by the elastic restoring force by.
- the disk-shaped support protrusion 205 formed on the core 202 is buried in the inside of the soft elastomer wheel 203, and the rigid rib ( rib).
- the support protrusion 205 is partially exposed to the outside through the buffer through hole along the circumferential direction in the portion where the buffer through hole is formed, so that the buffer through hole and the spiral grooves 211 and 212 are formed in the wheel 203. ) Is to be limited from being completely deformed, and by minimizing the deformation of the wheel 203 in the process of rotating the caster under load, there is an effect of giving balance and stability to the bogie.
- the technology according to the present invention can be applied to wheels such as a cart, baby stroller, or personal mobility used to transport goods in trains, aircraft, hospitals, airports, docks, shops, hotels, and the like.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims (6)
- 중공 파이프 형상의 금속 재질로 이루어진 부싱;상기 부싱의 외주면을 감싸도록 결합되고, 경질의 합성수지 재질로 이루어진 코어;상기 코어의 외주면을 감싸도록 결합되고, 상기 경질의 합성수지 보다 연질인 엘라스토머(elastomer) 재질로 이루어진 바퀴를 포함하되,상기 바퀴는 양측면에 완충 관통공이 형성된 것을 특징으로 하는 캐스터.
- 제1항에 있어서,상기 바퀴의 완충 관통공은 상기 부싱에 길이 방향으로 삽입되는 회전축을 중심으로 복수 개가 원주방향으로 배열된 것을 특징으로 하는 캐스터.
- 제2항에 있어서,상기 바퀴는 일측면에 상기 회전축을 중심으로 나선 형상으로 배열된 복수의 제1나선형 홈이 형성되고, 타측면에 상기 회전축을 중심으로 나선 형상으로 배열된 복수의 제2나선형 홈이 형성되되,상기 제1나선형 홈과 제2 나선형 홈은 나선 방향이 서로 반대방향으로 형성되고,상기 완충 관통공은 제1나선형 홈과 제2나선형 홈이 서로 교차하는 부분에 형성된 것을 특징으로 하는 캐스터.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서,상기 바퀴는 양측면에 링 형상의 요홈부가 형성되고, 상기 완충 관통공은 요홈부 상에 형성된 것을 특징으로 하는 캐스터.
- 제1항 내지 제3항 중 어느 하나의 항에 있어서,상기 코어의 외주면 중심부에는 원주 방향을 따라 외측으로 돌출된 원반 형상의 지지돌기가 형성되되,상기 지지돌기는 원주 방향을 따라 상기 바퀴에 매립되거나 상기 완충 관통공을 통해 외측 단부의 일부가 외부로 노출되는 것을 특징으로 하는 캐스터.
- 금속 소재를 이용하여 중공 파이프 형상의 부싱을 제조하는 단계;제1사출금형의 내부에 상기 제조된 부싱을 수용한 상태에서 경질의 합성수지 소재를 주입하여, 상기 부싱의 외주면을 환형으로 감싸는 형태의 코어를 형성하는 1차 사출 단계;제2사출금형의 내부에 상기 제조된 코어를 수용한 상태에서 상기 경질의 합성수지 보다 연질인 엘라스토머(elastomer) 소재를 주입하여, 상기 코어의 외주면을 환형으로 감싸는 형태의 바퀴를 형성하는 2차 사출 단계를 포함하되,상기 바퀴의 양측면에는 상기 부싱에 길이 방향으로 삽입되는 회전축을 중심으로 원주방향으로 배열되는 복수의 완충 관통공이 형성된 것을 특징으로 하는 캐스터 제조 방법.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2019-0027312 | 2019-03-11 | ||
| KR1020190027312A KR102195006B1 (ko) | 2019-03-11 | 2019-03-11 | 캐스터 및 그 제조 방법 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020184818A1 true WO2020184818A1 (ko) | 2020-09-17 |
Family
ID=72427578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2019/017953 Ceased WO2020184818A1 (ko) | 2019-03-11 | 2019-12-18 | 캐스터 및 그 제조 방법 |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102195006B1 (ko) |
| WO (1) | WO2020184818A1 (ko) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0577605A (ja) * | 1991-02-27 | 1993-03-30 | Goodyear Tire & Rubber Co:The | 非空気スペアタイヤ |
| JP2013237346A (ja) * | 2012-05-15 | 2013-11-28 | Combi Corp | 手押しカート用のタイヤ、手押しカート用の車輪、手押しカート |
| US20140239705A1 (en) * | 2013-02-26 | 2014-08-28 | Roll-Tech Molding Products, Llc | Treaded wheel |
| KR20170119074A (ko) * | 2016-04-18 | 2017-10-26 | 김영숙 | 산업용 바퀴 |
| KR20170139748A (ko) * | 2016-06-10 | 2017-12-20 | 경창정공 주식회사 | 캐스터용 휠 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100937348B1 (ko) | 2007-11-29 | 2010-01-20 | 코레일투어서비스 주식회사 | 물품판매 서비스용 카트 |
| KR20100052964A (ko) * | 2008-11-11 | 2010-05-20 | 명광산업주식회사 | 캐스터 |
-
2019
- 2019-03-11 KR KR1020190027312A patent/KR102195006B1/ko not_active Expired - Fee Related
- 2019-12-18 WO PCT/KR2019/017953 patent/WO2020184818A1/ko not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0577605A (ja) * | 1991-02-27 | 1993-03-30 | Goodyear Tire & Rubber Co:The | 非空気スペアタイヤ |
| JP2013237346A (ja) * | 2012-05-15 | 2013-11-28 | Combi Corp | 手押しカート用のタイヤ、手押しカート用の車輪、手押しカート |
| US20140239705A1 (en) * | 2013-02-26 | 2014-08-28 | Roll-Tech Molding Products, Llc | Treaded wheel |
| KR20170119074A (ko) * | 2016-04-18 | 2017-10-26 | 김영숙 | 산업용 바퀴 |
| KR20170139748A (ko) * | 2016-06-10 | 2017-12-20 | 경창정공 주식회사 | 캐스터용 휠 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20200108556A (ko) | 2020-09-21 |
| KR102195006B1 (ko) | 2020-12-24 |
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