Bidirectional brake type double eccentric caster

Abstract

The present invention relates to a bidirectional brake type double eccentric caster. The first problem to be solved by the present invention is to configure the double eccentric rotating body to rotate around two pivot points, the vertical centerline of the upper shaft and the vertical centerline of the lower shaft, thereby reducing the turning radius of the bogie (or unmanned transport vehicle) and preventing the bogie from deviating from the path of travel, and to prevent shaking of the bogie so as to safely transport heavy objects (transported goods). Furthermore, since the bogie is rotated around the two pivot points, the user does not need to exert much force to rotate the bogie, making operation easier. The second problem to be solved by the present invention is that the pressing part of the brake device or the pressing part protrudes to the outside of both sides of the caster body, so the user can easily operate the brake of the wheel even if the caster body changes to the front or rear when moving the bogie in the forward or reverse direction.

Description

Technology Field

[0001] The present invention relates to a bidirectional brake type double eccentric caster, and more specifically, to a bidirectional brake type double eccentric caster in which the double eccentric rotating body is configured to rotate around two pivot points, namely the vertical centerline of the upper shaft and the vertical centerline of the lower shaft, thereby reducing the turning radius of the bogie (or unmanned transport vehicle) and preventing the bogie from deviating from the path of travel, and effectively preventing shaking of the bogie during movement, thereby ensuring the safety of transport of the bogie, and even if the caster body changes to the front or rear when moving the bogie in the forward or reverse direction, the pressing part of the brake device protrudes to the outside of both sides of the caster body, so that the user can easily operate the brake of the wheel. Background Technology

[0002] Generally, casters are installed on the underside of a trolley (or unmanned transport vehicle) used to move heavy objects (transports) to facilitate easy movement of the trolley.

[0003] A caster consists of a fastening plate that enables installation on the underside of a bogie, a caster body that is rotatably coupled to the fastening plate, and a movable wheel installed on the caster body.

[0004] A plurality of connecting holes (bolt holes) are formed in the connecting plate so that it can be connected to the bottom surface of the bogie, and the caster is fixedly installed on the bottom surface of the bogie by fastening bolts into the connecting holes.

[0005] The caster body coupled to the fastening plate is installed via a bearing and is configured so that when the caster pivots, the caster body has one pivoting portion with the center of the bearing as a pivot point.

[0006] However, conventional casters have a single pivot point and rotate, so when pivoting, the turning radius increases, and the bogie shakes and deviates from the path of travel, which has the disadvantage of compromising the safety of transport.

[0007] In particular, conventional casters have the disadvantage of being very inconvenient to use because the user requires a lot of force to rotate the bogie as it rotates around a single pivot point.

[0008] In addition, since the pressing part of the brake device is installed on one side of the caster body, there is a disadvantage that when moving the bogie in the forward or reverse direction, the pressing part is located inside the bogie, making it difficult for the user to easily operate the wheel brake. Prior art literature

[0009] Republic of Korea Published Patent No. 10-2010-0000024 The problem to be solved

[0010] The present invention was developed to improve upon the aforementioned problems. The first objective of the present invention is to provide a bidirectional brake type double eccentric caster that is easy to operate because, by configuring the double eccentric rotating body to rotate around two pivot points—the vertical centerline of the upper shaft and the vertical centerline of the lower shaft—the turning radius of the bogie (or unmanned transport vehicle) is reduced, the bogie does not deviate from the path of travel, and the bogie is prevented from shaking, thereby safely transporting heavy objects (transported goods), and the user does not need to exert much force to rotate the bogie as it rotates around the two pivot points.

[0012] The second problem that the present invention aims to solve is to provide a bidirectional brake type double eccentric caster in which the pressing part of the brake device protrudes to the outside of both sides of the caster body, so that the user can easily operate the wheel brake even if the caster body changes to the front or rear when moving the bogie in the forward or reverse direction.

[0014] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0015] To achieve the above objective, the bidirectional brake type double eccentric caster according to the present invention comprises: a base fixing plate fixedly installed on the lower surface of a bogie; a caster body rotatably coupled to the base fixing plate; and a movable wheel rotatably installed on the caster body around a shaft (rotation axis or rotation pin). A caster having a double eccentric rotary member (double eccentric shaft member) comprising an eccentric body, an upper shaft formed on the upper side of the eccentric body and installed on the fastening plate via an upper bearing, and a lower shaft formed on the lower side of the eccentric body and installed on the caster body via a lower bearing, wherein the vertical center line (L1) of the upper shaft and the vertical center line (L2) of the lower shaft are positioned to be eccentric and configured to rotate at two pivot points.

[0017] In addition, the upper shaft and the lower shaft are configured so that their axis centers are spaced apart.

[0019] In addition, the vertical center line (L1) and the vertical center line (L2) may be configured to be spaced apart by, for example, 20 mm, and the vertical line between the vertical center line (L1) and the shaft (rotation axis) of the moving wheel may be spaced apart by, for example, 10 mm.

[0021] In addition, the double eccentric rotating body is configured to rotate at two pivot points of the vertical centerline to reduce the radius of rotation.

[0023] In addition, an upper bearing support step for supporting the upper bearing may be formed on the upper surface of the eccentric body in contact with the outer surface of the upper shaft, and a lower bearing support step for supporting the lower bearing may be formed on the lower surface of the eccentric body in contact with the outer surface of the lower shaft.

[0025] Meanwhile, the double eccentric caster according to the first modified example of the present invention has a technical feature in that a first insertion hole for inserting an upper shaft is formed by interposing an upper bearing at the center of a fastening plate, a finishing cap (end cap) is fastened to the first insertion hole, a support shaft is installed between the upper shaft and the finishing cap to support the upper end of the upper shaft, and the support shaft is rotatably installed by means of a support bearing.

[0027] A support shaft support member having a support mounting groove is formed protrudingly on the lower surface of the above-mentioned end cap and on the upper surface of the above-mentioned upper shaft, respectively, and a support bearing support step is formed on the bottom surface of the support mounting groove to support the support bearing, so that both ends of the support shaft do not come into contact with the bottom surface of the support mounting groove.

[0029] Furthermore, a lubricant storage space may be formed between the end cap and the fastening plate, and a lubricant passage may be formed inside the double eccentric rotating body.

[0031] Furthermore, the double eccentric caster according to the second variant of the present invention has a technical feature in which ratchet teeth are formed on the outer surface of the lower shaft and the inner surface of the upper bearing so that they do not separate arbitrarily after coupling when the upper shaft and the lower shaft are inserted into the upper bearing and the lower bearing and coupled.

[0032] A keyway is formed on the upper surface of the upper bearing and the upper shaft and on the lower surface of the lower bearing and the lower shaft, and is configured so that a key is fastened within the keyway.

[0034] Meanwhile, the bidirectional brake type double eccentric caster according to the present invention has a technical feature comprising: a fastening plate fixedly installed on the lower surface of a bogie; a caster body rotatably coupled to the fastening plate; and a wheel rotatably installed on the caster body around a shaft and having a plurality of locking grooves formed along its inner surface, wherein a pressing part of a brake device for braking the rotation of the wheel regardless of the forward and backward movement direction of the bogie is protruded to both sides of the caster body to enable bidirectional brake operation.

[0036] The brake device comprises: a front mounting bracket detachably installed on the front end of the caster body; a front pivoting lever coupled to the front mounting bracket by a hinge shaft to rotate at a certain angle, with a pressing portion protruding toward the front end of the caster body; a rear mounting bracket detachably installed on the rear end of the caster body; a rear pivoting lever coupled to the rear mounting bracket by a hinge shaft to rotate at a certain angle, with a pressing portion protruding toward the rear end of the caster body; an elastic member installed between the front pivoting lever and the rear pivoting lever to enable the front pivoting lever and the rear pivoting lever to move in conjunction and to elastically maintain the rotation angle of the front pivoting lever and the rear pivoting lever; and a stopper provided on the front end of at least one of the front pivoting lever or the rear pivoting lever to be inserted into the locking groove to brake the rotation of the wheel. Effects of the invention

[0037] As such, the present invention has the following effects.

[0038] First, upper and lower bearings are installed on the inner circumference of the fastening plate and the caster body, respectively, to facilitate the smooth rotation of the double eccentric rotating body. By configuring the double eccentric rotating body to rotate around two pivot points—the vertical centerline of the upper shaft and the vertical centerline of the lower shaft—the radius of rotation is reduced, the bogie is prevented from deviating from the path of travel, and shaking of the bogie is prevented, thereby allowing for the safe transport of heavy loads (transports).

[0039] Second, as the bogie is rotated around two pivot points, the user does not need to exert much force to rotate the bogie, making it very convenient to use.

[0040] Third, in the structure of the double eccentric rotating body, bearing support steps are formed on the upper and lower ends of the body, respectively, to support the bearings, thereby stably supporting the load of heavy objects loaded on the bogie.

[0041] Fourth, since the pressing part of the brake device protrudes outward from both sides of the caster body, the user can easily operate the wheel brake even if the caster body changes to the front or rear when moving the bogie in the forward or reverse direction.

[0042] Fifth, even if the brake is operated by pressing the pressing part of the front pivot lever or by pressing the pressing part of the rear pivot lever, the front pivot lever and the rear pivot lever can work in conjunction with each other to smoothly operate the brake.

[0044] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0045] FIG. 1 is a perspective view illustrating a bogie having a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention, illustrating the exposure of the pressing portion of the rear pivot lever of the brake device when the bogie moves forward. FIG. 2 is a perspective view illustrating a bogie having a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention, illustrating the exposure of the pressing portion of the front pivot lever of the brake device when the bogie moves backward. FIG. 3 is a rear perspective view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. Figure 4 is an enlarged view of section A of Figure 3. FIG. 5 is a front perspective view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. Fig. 6 is an enlarged view of section B of Fig. 3. FIG. 7 is a side view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 8 is a front view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 9 is an exploded perspective view illustrating a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 10 is an separated perspective view of the essential part of FIG. 9. FIG. 11 is a cross-sectional view illustrating a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 12 is an exploded perspective view illustrating a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 13 is a combined perspective view illustrating the combination of a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 14 is a longitudinal cross-sectional view illustrating the combination of a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 15 is a drawing sequentially showing the state in which the direction of travel of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention is changed. FIG. 16 is a bottom view of FIG. 15 FIG. 17 is a drawing sequentially showing the pivoting states of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 18 is an exploded perspective view illustrating a bidirectional brake type double eccentric caster according to a first modified example of the present invention. FIG. 19 is a cross-sectional view illustrating a bidirectional brake type double eccentric caster according to a first modified example of the present invention. FIG. 20 is an enlarged view of the key part of FIG. 19. FIG. 21 is an exploded perspective view illustrating a bidirectional brake type double eccentric caster according to a second modified example of the present invention. FIG. 22 is a cross-sectional view illustrating a bidirectional brake type double eccentric caster according to a second modified example of the present invention. FIG. 23 is a plan view illustrating the combination of a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a second modified example of the present invention. FIG. 24 is a longitudinal cross-sectional view illustrating the combination of a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a second modified example of the present invention. FIG. 25 is a drawing for explaining the assembly of a brake device in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. Fig. 26 is an excerpt of the key part of Fig. 25 FIG. 27 is an exploded perspective view of a brake device in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 28 is a perspective view illustrating the locking state of a brake device in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 29 is an enlarged view of section C of FIG. 28 FIG. 30 is a front view illustrating the locking state of a brake device in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 31 is an enlarged view of section D of FIG. 30. FIG. 32 is a perspective view illustrating the unlocked state of a brake device in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 33 is an enlarged view of section E of FIG. 32. FIG. 34 is a front view illustrating the unlocked state of a brake device in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention. FIG. 35 is an enlarged view of section F of FIG. 34. Specific details for implementing the invention

[0046] Hereinafter, a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0047] FIG. 1 is a perspective view illustrating a bogie having a double eccentric caster of a bidirectional brake type according to a preferred embodiment of the present invention, illustrating the exposure of the pressing portion of the rear pivot lever of the brake device when the bogie moves forward.

[0048] FIG. 2 is a perspective view illustrating a bogie having a double eccentric caster of a bidirectional brake type according to a preferred embodiment of the present invention, illustrating the exposure of the pressing portion of the front pivot lever of the brake device when the bogie moves backward.

[0049] FIG. 3 is a rear perspective view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention, and FIG. 4 is an enlarged view of part A of FIG. 3.

[0050] FIG. 5 is a front perspective view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention, and FIG. 6 is an enlarged view of part B of FIG. 3.

[0051] FIG. 7 is a side view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention, and FIG. 8 is a front view of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention.

[0052] FIG. 9 is an exploded perspective view illustrating a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention, FIG. 10 is an exploded perspective view of a key part of FIG. 9, and FIG. 11 is a longitudinal cross-sectional view illustrating a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention.

[0053] FIG. 12 is an exploded perspective view showing a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention.

[0054] FIG. 13 is a combined perspective view illustrating the combination of a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention.

[0055] And FIG. 14 is a cross-sectional view illustrating the combination of a double eccentric rotating body and upper and lower bearings in a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention.

[0056] Referring to FIGS. 1 to 14, a bidirectional brake type double eccentric caster (1) according to a preferred embodiment of the present invention comprises: a fastening plate (110) fixedly installed on the lower surface of a bogie (or unmanned transport vehicle) (10); a caster body (120) rotatably coupled to the fastening plate (110); and a wheel (130) rotatably installed on the caster body (120).

[0057] The above-mentioned fastening plate (110) has a plurality of connecting holes (bolt holes) (111) formed so as to be connected to the bottom surface of the bogie (10), and is configured to fix and install the caster (100) on the bottom surface of the bogie (10) by fastening a bolt (113) into the connecting holes (111).

[0058] A bidirectional brake type double eccentric caster (1) according to a preferred embodiment of the present invention comprises a double eccentric body (143), an upper shaft (141) formed on the upper side of the eccentric body (143) and installed on a fastening plate (110) via an upper bearing (B1), and a lower shaft (142) formed on the lower side of the eccentric body (143) and installed on a caster body (120) via a lower bearing (B2).

[0059] The wheel (130) is rotatably installed on the caster body (120) by means of a shaft (hinge pin) (131). A plurality of locking grooves (132) are formed along the inner surface of the wheel (130).

[0060] The above double eccentric rotating body (140) is configured to rotate at two pivot points by positioning the vertical centerlines (L1, L2) (shown in FIG. 11) of the upper shaft (141) and the lower shaft (142) to be eccentric with respect to each other.

[0061] The above double eccentric rotating body (140) is configured to rotate around two pivot points, namely the vertical centerline (L1) of the upper shaft (141) and the vertical centerline (L2) of the lower shaft (142), thereby reducing the radius of rotation, so that the bogie (10) does not deviate from the path of travel and can prevent shaking of the bogie (10), so that heavy objects (transports) can be safely transported.

[0062] The upper shaft (141) and the lower shaft (142) are configured so that their axis centers are spaced apart. That is, the vertical center lines (L1, L2) are configured to be spaced apart, and the distance between the vertical center line (L1) and the vertical center line (L2) can be, for example, 20 mm. And the distance between the vertical center line (L2) and the vertical line (L3) of the wheel (130) shaft (131) can be configured to be, for example, 10 mm.

[0064] Meanwhile, with further reference to FIGS. 11 to 14, the structure of the double eccentric rotating body (140) will be explained further.

[0065] In a preferred embodiment of the present invention, a double eccentric rotating body (140) has an upper shaft (141) formed on the upper side of the body (143) and a lower shaft (142) formed on the lower side of the body (143). The upper shaft (141) and the lower shaft (142) are positioned so that vertical centerlines (L1, L2) (shown in FIG. 11) are eccentric to each other and are configured to rotate at two pivot points of the vertical centerlines (L1, L2).

[0066] An upper bearing support step (141a) for supporting an upper bearing (B1) is formed on the upper surface of the eccentric body (143) that contacts the outer surface of the upper shaft (141), and a lower bearing support step (141b) for supporting a lower bearing (B2) is formed on the lower surface of the eccentric body (143) that contacts the outer surface of the lower shaft (142), thereby allowing the upper and lower bearings (B1, B2) to be installed more stably so that the double eccentric caster (100) stably supports the load of a heavy object loaded on the trolley (10).

[0068] In addition, FIG. 15 is a drawing showing the state in which the direction of travel of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention is changed, and FIG. 16 is a bottom view of FIG. 15.

[0069] Referring further to FIGS. 15 and 16, arrow (A) indicates the direction of travel of the double eccentric caster (1) and arrow (B) indicates the direction of rotation of the wheel (130). When the double eccentric caster (1) is moved to the left and then changes direction to move to the right, the caster body (120) rotates and the double eccentric rotating body (140) rotates at the same time, causing the direction of the wheel (130) to change and turn with a small radius.

[0070] That is, by the double eccentric rotating body (140), the caster body (120) has two pivoting parts that are each rotated at an eccentric position relative to the fastening plate (110), so that the double eccentric caster (1) rotates with a relatively smaller radius than a conventional caster having one pivoting part.

[0072] And FIG. 17 is a drawing showing the pivoting state of a bidirectional brake type double eccentric caster according to a preferred embodiment of the present invention.

[0073] Referring further to FIG. 17, the bidirectional brake type double eccentric caster (1) according to a preferred embodiment of the present invention has two pivot points on vertical centerlines (L1, L2) when pivoting, and as it rotates, the radius of rotation becomes smaller (see FIG. 11).

[0074] That is, the upper shaft (141) of the double eccentric rotating body (140) is installed on the fastening plate (110) via an upper bearing (B1) and rotated, and the lower shaft (142) of the double eccentric rotating body (140) is installed on the caster body (120) via a lower bearing (B2) at a position eccentric from the central part coupled to the fastening plate (110) and rotated eccentrically, so that the double eccentric caster (100) of the present invention rotates with a relatively smaller radius than a conventional caster having one pivoting part.

[0076] Meanwhile, FIGS. 18 and 19 are an exploded perspective view and a longitudinal section view illustrating a double eccentric caster according to a first modified example of the present invention, and FIG. 20 is an enlarged view of a key part of FIG. 19.

[0077] Referring to FIGS. 18 to 20, a double eccentric caster (2) according to a first variant of the present invention comprises: a fastening plate (110) fixedly installed on the lower surface of a bogie (or unmanned transport vehicle) (10) (see FIG. 1); a caster body (120) rotatably coupled to the fastening plate (110); and a wheel (130) rotatably installed on the caster body (120).

[0078] A first insertion hole (110a) for inserting an upper shaft (141) is formed in the center of the above-mentioned fastening plate (110) via an upper bearing (B1), and a finishing cap (150) is fastened to the first insertion hole (110a).

[0079] A support shaft (160) is installed between the upper shaft (141) and the end cap (150) to support the upper end of the upper shaft (141), and the support shaft (160) is rotatably installed by means of a support bearing (B3).

[0080] A support shaft support member (161) having a support mounting groove (160a) is formed protrudingly on the lower surface of the above-mentioned end cap (150) and on the upper surface of the above-mentioned upper shaft (141), and a support bearing support step (160b) for supporting a support bearing (B3) is formed on the bottom surface of the support mounting groove (160a) so that both ends of the support shaft (160) do not come into contact with the bottom surface of the support mounting groove (160a).

[0081] Furthermore, a lubricant storage space (170) is formed between the end cap (150) and the fastening plate (110), and a lubricant passage (171) is formed inside the double eccentric rotating body (140).

[0082] In the double eccentric caster (2) according to the first modified example of the present invention configured as such, the support shaft (160) is rotatably installed by means of the upper and lower bearings (B1, B2) as well as the support bearing (B3), thereby preventing shaking of the support shaft (160) and enabling more stable rotation of the support shaft (160).

[0083] And by supplying lubricating oil to the upper and lower bearings (B1, B2) through the lubricating oil passage (171), smooth rotation of the support shaft (160) can be facilitated.

[0085] Meanwhile, FIGS. 21 and 22 are an exploded perspective view and a longitudinal section view illustrating a double eccentric caster according to a second modified example of the present invention.

[0086] FIG. 23 is a plan view illustrating the combination of a double eccentric rotor and upper and lower bearings in a double eccentric caster according to a second modified example of the present invention, and FIG. 24 is a longitudinal cross-sectional view illustrating the combination of a double eccentric rotor and upper and lower bearings in a double eccentric caster according to a second modified example of the present invention.

[0087] Referring to FIGS. 21 to 24, a double eccentric caster (3) according to a second variant of the present invention comprises: a fastening plate (110) fixedly installed on the lower surface of a bogie (or unmanned transport vehicle) (10) (see FIG. 1); a caster body (120) rotatably coupled to the fastening plate (110); and a wheel (130) rotatably installed on the caster body (120).

[0088] When the upper shaft (141) and the lower shaft (141) are inserted and coupled into the upper bearing (B1) and the lower bearing (B2), ratchet teeth (180) are formed on the outer surface of the lower shaft (142) and the inner surface of the upper bearing (B1) so that they do not separate arbitrarily after coupling. Here, ratchet teeth refer to teeth that are inclined in only one direction.

[0089] A keyway (191) is formed on the upper surface of the upper bearing (B1) and the upper shaft (141), and on the lower surface of the lower bearing (B2) and the lower shaft (142), and is configured so that a key (192) is fastened inside the keyway (191).

[0090] In the double eccentric caster (3) according to the second modified example of the present invention configured as described above, when the upper shaft (141) and the lower shaft (141) are inserted and coupled into the upper bearing (B1) and the lower bearing (B2) by means of the ratchet teeth (180), since the structure of the ratchet teeth allows only forward movement and not backward movement, the coupling of the upper and lower shafts (141, 142) coupled into the upper and lower bearings (B1, B2) is not separated and remains intact, and furthermore, by fastening the key (192) into the keyway (191), the coupling force can be further improved.

[0092] Also, referring to FIGS. 1 to 8, the bidirectional brake type double eccentric caster (1) according to a preferred embodiment of the present invention has a technical feature in that the pressing part (224) (244) of the brake device (200) for braking the rotation of the wheel (130) regardless of the forward and backward movement direction of the bogie (10) is protruded to both sides of the caster body (120) so that bidirectional brake operation is possible.

[0094] The brake device (200) of the present invention is not limited to double eccentric casters and can be applied and used in the same way to general casters.

[0095] Hereinafter, with further reference to FIGS. 25 to 35, the brake device (200) of the present invention will be described in detail as follows.

[0096] As illustrated in the drawing, the brake device (200) of the present invention comprises a front support (210); a front pivot lever (220); a rear support (230); a rear pivot lever (240); an elastic member (250); and a stopper (260).

[0097] The front mounting bracket (210) and the rear mounting bracket (230) are formed with the same shape. The front pivot lever (220) and the rear pivot lever (240) are formed with the same shape.

[0098] The front mounting bracket (210) is detachably installed on the front end of the caster body (120). That is, the front mounting bracket (210) is configured such that it can be fitted and coupled to the lower end of the front end of the caster body (120). A fitting groove (211) is formed on the upper side of the front mounting bracket body (210A), a bolt hole (212) for fastening a bolt (screw) (S) is formed on the upper side of the front mounting bracket body (210A), and a hinge shaft hole (213) through which a hinge shaft (221) passes is formed in the front mounting bracket body (210A). The front mounting bracket (210) is configured to be fastened to the lower end of the front end of the caster body (120) by fastening a bolt (S) to the bolt hole (212).

[0100] In addition, the front pivot lever (220) is configured to pivot at a certain angle relative to the front mounting bracket (210) with respect to the hinge axis (221).

[0101] An insertion hole (221a) for inserting and installing a mounting bracket (210) is formed in the front pivot lever body (220A), and hinge shaft holes (222) through which a hinge shaft (221) passes are formed on both sides of the insertion hole (221a). A spring fixing groove (223) for inserting and fixing an elastic member (250) is formed in the front end of the front pivot lever body (220A). A pressing part (224) for a user to press with their foot (or hand) to brake the rotation of the wheel (130) is formed in the rear end of the front pivot lever body (220A).

[0103] Additionally, the rear support (230) is detachably installed at the rear end of the caster body (120). That is, the rear support (230) is configured such that it can be fitted and coupled to the lower rear end of the caster body (120). A fitting groove (231) is formed on the upper side of the rear support body (230A), a bolt hole (232) for fastening a bolt (S) is formed on the upper side of the rear support body (230A), and a hinge shaft hole (233) through which a hinge shaft (221) passes is formed in the rear support body (230A). The rear support (230) is configured to be fastened to the lower rear end of the caster body (120) by fastening a bolt (S) to the bolt hole (212).

[0105] In addition, the rear pivot lever (240) is configured to pivot at a certain angle relative to the rear mounting bracket (210) with respect to the hinge axis (221).

[0106] An insertion hole (241a) for inserting and installing a rear mounting bracket (230) is formed in the rear pivot lever body (240A), and hinge shaft holes (242) through which a hinge shaft (241) passes are formed on both sides of the insertion hole (241a). A spring fixing groove (243) for inserting and fixing an elastic member (250) is formed in the front end of the rear pivot lever body (240A). A pressing part (244) for a user to press with their foot (or hand) to brake the rotation of the wheel (130) is formed in the rear end of the rear pivot lever body (240A).

[0108] Additionally, the elastic member (250) is installed between the front pivot lever (220) and the rear pivot lever (240). The elastic member (250) enables the front pivot lever (220) and the rear pivot lever (240) to move in tandem and allows the pivot angle of the front pivot lever (220) and the rear pivot lever (240) to be maintained elastically. Both ends of the elastic member (250) are inserted and fixed within the spring fixing groove (223).

[0110] And the stopper (260) may be provided at the tip of at least one of the front pivot lever (220) or the rear pivot lever (240) so as to be inserted into the locking groove (132) to brake the rotation of the wheel (130). The stopper (260) may be composed of a stopping body (261) and a pin (262) inserted into the locking groove (132).

[0112] The stopper (260) is optionally inserted into the locking groove (132) to brake the rotation of the wheel (130) when the front pivot lever (220) and the rear pivot lever (240) each pivot at a certain angle with respect to the hinge axis (221) (241).

[0113] The stopper (260) may be formed as a separate part and fastened with a bolt to the front end of the front pivot lever (220) and the rear pivot lever (240), but may also be formed integrally to the front end of the front pivot lever (220) and the rear pivot lever (240).

[0115] The operation of the brake device (200) of the present invention configured as described above is as follows.

[0116] In the bidirectional brake type double eccentric caster (1) according to a preferred embodiment of the present invention, when moving the bogie (10) in a forward or backward direction, the double eccentric rotating body (140) rotates around two pivot points, namely the vertical centerline (L1) of the upper shaft (141) and the vertical centerline (L2) of the lower shaft (142), and the caster body (120) also changes to the front or rear.

[0117] In the bidirectional brake type double eccentric caster (1) according to a preferred embodiment of the present invention, the pressing part (224) or the pressing part (244) of the brake device (200) protrudes outward from both sides of the caster body (120), so that when moving the bogie (10) in a forward or backward direction, the user can easily operate the brake of the wheel (130) even if the caster body (120) also changes to the front or rear.

[0118] Even if the brake is operated by pressing the pressing part (224) of the front pivot lever (220) or by pressing the pressing part (244) of the rear pivot lever (240), the front pivot lever (220) and the rear pivot lever (240) are linked together to operate the brake in the same way.

[0119] Below, we will first explain how to operate the brake by pressing the pressing part (224) of the front pivot lever (220).

[0120] When a user presses the pressing part (224) of the front pivot lever (220) with their foot (or hand), the front pivot lever (220) rotates around the hinge axis (221). Due to the elastic member (250), the rear pivot lever (240) connected to the front pivot lever (220) also rotates in conjunction with the hinge axis (241). The elastic member (250) allows the pivot angle of the front pivot lever (220) and the rear pivot lever (240) to be maintained elastically. Due to the rotation of the front pivot lever (220) and the rear pivot lever (240), the pin (262) of the stopper (260) is inserted into the locking groove (132), thereby braking the rotation of the wheel (130).

[0121] Additionally, when the user presses the pressing part (244) of the rear pivot lever (240) with their foot (or hand), the rear pivot lever (240) rotates around the hinge axis (241). Due to the elastic member (250), the front pivot lever (220) connected to the rear pivot lever (240) also rotates in conjunction with the hinge axis (221). The elastic member (250) allows the pivot angle of the front pivot lever (220) and the rear pivot lever (240) to be maintained elastically. Due to the rotation of the front pivot lever (220) and the rear pivot lever (240), the pin (262) of the stopper (260) is inserted into the locking groove (132), thereby braking the rotation of the wheel (130).

[0123] As such, the present invention has the following effects.

[0124] First, upper and lower bearings are installed on the inner circumference of the fastening plate and the caster body, respectively, to facilitate the smooth rotation of the double eccentric rotating body. By configuring the double eccentric rotating body to rotate around two pivot points—the vertical centerline of the upper shaft and the vertical centerline of the lower shaft—the radius of rotation is reduced, the bogie is prevented from deviating from the path of travel, and shaking of the bogie is prevented, thereby allowing for the safe transport of heavy loads (transports).

[0125] Second, as the bogie is rotated around two pivot points, the user does not need to exert much force to rotate the bogie, making it very convenient to use.

[0126] Third, in the structure of the double eccentric rotating body, bearing support steps are formed on the upper and lower ends of the body, respectively, to support the bearings, thereby stably supporting the load of heavy objects loaded on the bogie.

[0127] Fourth, since the pressing part of the brake device or the pressing part protrudes outward from both sides of the caster body, the user can easily operate the wheel brake even if the caster body changes to the front or rear when moving the bogie in the forward or reverse direction.

[0128] Fifth, even if the brake is operated by pressing the pressing part of the front pivot lever or by pressing the pressing part of the rear pivot lever, the front pivot lever and the rear pivot lever can work in conjunction with each other to smoothly operate the brake.

[0130] Meanwhile, the present specification and drawings disclose preferred embodiments of the present invention. Although specific terms have been used, they are used merely in a general sense to facilitate the explanation of the technical content of the invention and to aid in understanding the invention, and are not intended to limit the scope of the invention.

[0131] It is obvious to those skilled in the art that, in addition to the embodiments disclosed herein, other variations based on the technical concept of the present invention are possible. Explanation of the symbols

[0132] 200: Brake device 210: Front mount 220: Front pivot lever 221: Hinge axis 224: Pressing part 230: Rear mount 240: Rear pivot lever 241: Hinge axis 244: Pressing part 250: Elastic member 260: Stopper

Claims

Claim 1 A fastening plate (110) fixedly installed on the lower surface of a bogie (10); a caster body (120) rotatably coupled to the fastening plate (110); A caster (1) having a wheel (130) which is rotatably installed on the caster body (120) around a shaft (131) and has a plurality of locking grooves (132) formed along its inner surface, wherein the caster (1) has a double eccentric rotating body (140) comprising an eccentric body (143), an upper shaft (141) formed on the upper side of the eccentric body (143) and installed on the fastening plate (110) via an upper bearing (B1), and a lower shaft (142) formed on the lower side of the eccentric body (143) and installed on the caster body (120) via a lower bearing (B2), wherein the vertical centerline (L1) of the upper shaft (141) and the vertical centerline (L2) of the lower shaft (142) are positioned eccentrically to rotate at two pivot points, and the upper bearing (B1) is positioned at the center of the fastening plate (110). A first insertion hole (110a) for inserting the upper shaft (141) is formed, and a seal cap (150) is fastened to the first insertion hole (110a). A support shaft (160) for supporting the upper end of the upper shaft (141) is installed between the upper shaft (141) and the seal cap (150). The support shaft (160) is rotatably installed by means of a support bearing (B3). A support shaft support portion (161) having a support mounting groove (160a) is formed protrudingly on the lower surface of the seal cap (150) and the upper end of the upper shaft (141), respectively. A support bearing support step (160b) for supporting the support bearing (B3) is formed on the bottom surface of the support mounting groove (160a) so that both ends of the support shaft (160) do not come into contact with the bottom surface of the support mounting groove (160a).A bidirectional brake type double eccentric caster characterized in that the pressing portion (224)(244) of the brake device (200) for braking the rotation of the wheel (130) regardless of the forward / backward movement direction of the bogie (10) is configured to protrude to both sides of the caster body (120) to enable bidirectional brake operation. Claim 2 In claim 1, the brake device (200) comprises: a front mounting bracket (210) detachably installed on the front end of the caster body (120); a front pivoting lever (220) coupled to the front mounting bracket (210) by a hinge shaft (221) to rotate at a certain angle, with a pressing part (224) protruding toward the front end of the caster body (120); a rear mounting bracket (230) detachably installed on the rear end of the caster body (120); a rear pivoting lever (240) coupled to the rear mounting bracket (230) by a hinge shaft (241) to rotate at a certain angle, with a pressing part (244) protruding toward the rear end of the caster body (120); and the front pivoting lever (220) and the rear pivoting lever (240) can be linked together, and the front A bidirectional brake type double eccentric caster comprising: an elastic member (250) installed between the front pivot lever (220) and the rear pivot lever (240) to elastically maintain the pivot angle of the pivot lever (220) and the rear pivot lever (240); and a stopper (260) provided at the tip of at least one of the front pivot lever (220) or the rear pivot lever (240) to be inserted into the locking groove (132) to brake the rotation of the wheel (130). Claim 3 A bidirectional brake type double eccentric caster characterized in that, in claim 1, the upper shaft (141) and the lower shaft (142) have their axis centers spaced apart. Claim 4 A bidirectional brake type double eccentric caster characterized in that, in paragraph 2, the vertical centerline (L1) and the vertical centerline (L2) are spaced apart by 20 mm, and the vertical centerline (L2) and the vertical line (L3) of the wheel (130) shaft (131) are spaced apart by 10 mm. Claim 5 In paragraph 2, the double eccentric rotating body (140) is configured to rotate at two pivot points of the vertical centerlines (L1, L2) to reduce the radius of rotation, thereby forming a bidirectional brake type double eccentric caster. Claim 6 A bidirectional brake type double eccentric caster, characterized in that, in claim 1, an upper bearing support step (141a) for supporting the upper bearing (B1) is formed on the upper surface of the eccentric body (143) that contacts the outer surface of the upper shaft (141), and a lower bearing support step (141b) for supporting the lower bearing (B2) is formed on the lower surface of the eccentric body (143) that contacts the outer surface of the lower shaft (142). Claim 7 A bidirectional brake type double eccentric caster, characterized in that, in claim 1, a lubricant storage space (170) is formed between the end cap (150) and the fastening plate (110), and a lubricant passage (171) is formed inside the double eccentric rotating body (140). Claim 8 A bidirectional brake type double eccentric caster, characterized in that, in claim 1, when the upper shaft (141) and the lower shaft (141) are inserted and coupled into the upper bearing (B1) and the lower bearing (B2), a ratchet tooth (180) is formed on the outer surface of the lower shaft (142) and the inner surface of the upper bearing (B1) so that they are not arbitrarily separated after coupling. Claim 9 A bidirectional brake type double eccentric caster, characterized in that, in claim 8, a keyway (191) is formed on the upper surface of the upper bearing (B1) and the upper shaft (141) and on the lower surface of the lower bearing (B2) and the lower shaft (142), and a key (192) is fastened within the keyway (191). Claim 10 A fastening plate (110) fixedly installed on the lower surface of a bogie (10); a caster body (120) rotatably coupled to the fastening plate (110); In a caster (100) having a wheel (130) that is rotatably installed on the caster body (120) around a shaft (131) and has a plurality of locking grooves (132) formed along its inner surface, the pressing part (224) (244) of a brake device (200) for braking the rotation of the wheel (130) regardless of the forward / backward movement direction of the bogie (10) is configured to protrude to both sides of the caster body (120) to enable bidirectional brake operation, and the brake device (200) comprises: a front mounting bracket (210) detachably installed on the front end of the caster body (120); a front rotation lever (220) coupled to the front mounting bracket (210) by a hinge shaft (221) so as to be able to rotate at a certain angle, and having a pressing part (224) formed protruding toward the front end of the caster body (120); and the caster A rear mounting bracket (230) detachably installed at the rear end of a body (120); a rear pivoting lever (240) coupled to the rear mounting bracket (230) by a hinge shaft (241) so as to be able to pivot at a certain angle, with a pressing portion (244) formed protruding toward the rear end of the caster body (120); and an elastic member (250) installed between the front pivoting lever (220) and the rear pivoting lever (240) so as to enable the front pivoting lever (220) and the rear pivoting lever (240) to be linked and to elastically maintain the pivoting angle of the front pivoting lever (220) and the rear pivoting lever (240). A bidirectional brake type double eccentric caster comprising: a stopper (260) provided at the tip of at least one of the front pivot lever (220) or the rear pivot lever (240) to be inserted into the locking groove (132) to brake the rotation of the wheel (130). Claim 11 delete

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