KR20010069427A - Shock-absorbing type caster - Google Patents

Abstract

PURPOSE: A buffer caster is provided to generate sufficient buffer force, and to easily control the buffer force. CONSTITUTION: A buffer caster comprises a top plate(110) fixed on a lower face of a transferring device; a top pin(120) fixed by penetrating a middle portion of the top plate; a yoke(130) opening a lower face and lifting a front face by being connected to the top pin; a nut(171) supporting the yoke by being combined to a lower end portion of the top pin; a pair of arms(140) rotating around a wheel according to rising of the wheel and lifting of the yoke; a pad composed of rubber; plural springs of metal material placed to the pad; a rubber cap contacting to an upper end of the spring; a buffer member(160) rotating by the arm; and a compress unit pressurizing the buffer member in contacting with a back face of the yoke by rotating backward through elastic force of the spring. An end of the arm is supported by the yoke and the other end is exposed outside to support the wheel contacted with a floor. A front face of the pad is supported by the arm and the back face is corresponded to the back face of the yoke. An outer face of the cap contacts to the back face of the yoke, and an inner face contacts to an upper end of the spring and the back face of the pad.

Description

Shock Absorbing Caster {SHOCK-ABSORBING TYPE CASTER}

The present invention relates to a shock absorbing caster having an improved structure of a shock absorbing member that absorbs load and impact.

Caster (Caster) is coupled to the lower end side of the conveying device refers to the wheel that can be freely changed direction, it is roughly divided into a fixed caster and a rotary caster.

In addition, the cushion-type caster also has a function of absorbing the load and impact to prevent damage to the mounted object, a metal spring is used as the buffer member to absorb the load and impact. However, the buffer type caster as described above has a disadvantage in that a lot of noise is generated due to the direct contact between a predetermined portion of the spring of the metal material and the buffer type caster.

In order to solve the above disadvantages, a shock absorbing caster having a shock absorbing member made of a rubber material has been developed and used. Such a conventional cushioning caster will be described with reference to FIG. 1 is a cross-sectional view showing the structure of a conventional buffer type caster.

As shown in the drawing, an attachment plate 11 coupled to and fixed to the bottom of a conveying device such as a trolley or moving table and a wheel 13 in contact with the floor are provided. When a load and an impact are transmitted through the attachment plate 11 and the wheel 13, the cover 15 provided between the attachment plate 11 and the wheel 13 is lowered. Then, the cushioning member 17 of the rubber material installed inside the cover 15 is compressed to absorb the load and the impact, thereby preventing damage to the article and the caster to be transported.

In the conventional buffer type caster as described above, the buffer member 17 is made of a rubber material, and thus, does not generate sufficient buffering force. This has the disadvantage that the objects and casters to be transported are damaged.

The present invention has been made to solve the above problems, an object of the present invention is to provide a buffer type caster that can generate a sufficient size of the buffer force, and can easily adjust the buffer force.

Another object of the present invention is to provide a buffer type caster that can increase the buffer efficiency by allowing the buffer member to be uniformly compressed.

1 is a cross-sectional view showing the structure of a conventional buffer type caster.

Figure 2 is a perspective view of a buffer type caster according to an embodiment of the present invention.

3 is a front sectional view of FIG.

Figure 4 is an exploded perspective view of the yoke and the buffer member and the arm in accordance with an embodiment of the present invention.

5A and 5B are perspective views of a top pin according to embodiments of the present invention.

Figure 6 is an exploded perspective view of the buffer member according to an embodiment of the present invention.

7 is a cross-sectional view taken along the line A-A of FIG.

8A to 8G are cross-sectional views taken along line B-B of FIG. 6 to show a state in which a spring of the buffer member is installed in various forms according to an embodiment of the present invention.

9a to 9c is a front view of the arm side to show that the buffer member according to an embodiment of the present invention is compressed.

* Description of the symbols for the main parts of the drawings *

110: top plate 120: top pin

130: York 140: Arm

150: wheel 160: buffer member

161: pad 165: spring

167: cap

A buffer type caster according to the present invention for achieving the above object, the top plate is fixed to the bottom of the conveying device; A top pin fixed through the center of the top plate; A yoke coupled to the top pin positioned at the bottom of the top plate and having a front surface and a bottom surface opened and lowered in the same manner as the top pin; A nut fastened to a lower end of the top pin to support the yoke; One end side is supported on both sides of the yoke, and the other end side is exposed to the outside of the yoke to support the wheel in contact with the bottom, and the pair of the elevating and rotating the yoke of the yoke to rotate the wheel relative to the center of the wheel Arm; The front side is supported by the arm and the back is a pad of rubber material facing the back of the yoke, a plurality of springs of metal material uniformly seated on the pad, coupled to the back of the pad and the outer surface is the back and face of the yoke. A buffer member which contacts and the inner surface rotates by the arm while including a cap of a rubber material which is in surface contact with the top of the spring and the back of the pad; And a means for causing the shock absorbing member to be rotated in a direction opposite to the rotational direction of the arm by the elastic force of the spring so that the shock absorbing member is compressed while uniformly contacting the rear surface of the yoke.

Hereinafter, with reference to the accompanying drawings will be described in detail the buffer type caster according to an embodiment of the present invention. Figure 2 is a perspective view of a buffer type caster according to an embodiment of the present invention, Figure 3 is a front sectional view of FIG.

As shown, the top plate 110 is provided to be coupled to the bottom of the conveying device, such as a trolley or moving table. The top pin 120 is coupled and fixed to the center of the top plate 110, and the top pin 120 vertically penetrates the top plate 110. Thus, the top pin 120 is raised and lowered in the same manner as the top plate 110 which is lifted by the load and the external impact of the conveying device.

A portion of the top pin 120 protruding to the lower side of the top plate 110 is coupled to the yoke 130 having the front and bottom surfaces opened, and the yoke 130 is elevated in the same manner as the top pin 120. The nut 171 is fastened to the lower end of the top pin 120 to prevent the yoke 130 from being separated from the top pin 120.

The lower recess 111 and the upper recess 135 are formed at portions of the top plate 110 and the yoke 130 through which the top pin 120 penetrates. The upper recess 135 is formed with a through hole 137 (see FIG. 4) through which the top pin 120 penetrates. The through hole 137 has a rectangular through hole 137a and a circular through hole 137b. Is formed. In detail, the central portions of the four sides of the rectangular through hole 137a are formed to be rounded, and the through hole 137 is formed in a form in which a imaginary line connecting the rounding part forms a circular through hole 137b. The yoke 130 rotates when the circular top pin 121 penetrates the circular through hole 137 as shown in FIG. 5A, and the yoke 130 when the angled top pin 123 penetrates as shown in FIG. 5B. ) Is not rotated.

Hereinafter, the form in which the yoke 130 is rotated will be mainly described.

An upper bearing 173 which helps smooth rotation of the yoke 130 is installed in contact with the lower recess 111 and the upper recess 135, and the upper bearing 173 has an upper dust cover 175 having an open upper surface. Protected by). That is, the upper dust cover 175 is installed while penetrating the upper recess 135.

The top plate 110 adjacent to the top surface of the upper dust cover 175 is formed with an embossing 113 having a rim protruding downward, and the embossing 113 reinforces the strength of the top plate 110 at the same time. The foreign material is prevented from flowing between the bottom surface of the top plate 110 and the top surface of the upper dust cover 175.

In addition, a lower dust cover 179 is provided at a portion of the top pin 120 between the yoke 130 and the nut 171 to protect the lower bearing 177 and the lower bearing 177. The lower bearing 177 is in contact with the upper recess 135 and the nut 179 to help smooth rotation of the yoke 130.

The top plate 110, the top pin 120, the yoke 130, and the upper and lower dust covers 175 and 179 according to the present embodiment are simply coupled to each other in a penetrating or inserted manner.

One end side of the paired arm 140 is supported inside both side surfaces of the yoke 130, and the other end side of the arm 140 is exposed to the outside of the yoke 130. The other end side of the arm 140 is coupled to the wheel 150 that is in contact with the bottom to rotate about the rotation shaft 151. In addition, the arm 140 is supported by a shock absorbing member 160 (see FIG. 4), the shock absorbing member 160 absorbs the load and impact of the conveying device to prevent damage to the article to be transported and the shock absorbing caster. do.

Figure 4 is an exploded perspective view of the yoke, the buffer member and the arm according to an embodiment of the present invention, it will be described.

As shown, embossing 139 for strength reinforcement is formed just outside the upper recess 135 of the yoke 130, and first and second coupling holes 131 and 133 are formed on both sides of the yoke 130, respectively. In addition, at one end side of the paired arms 140, rotation limiting holes 141 and communicating holes 143 communicating with the first and second coupling holes 131 and 133, respectively, are formed. At this time, the rotation restriction hole 141 has a predetermined length along the rotation direction of the yoke 130, the communication hole 143 is formed in the same manner as the first coupling hole (131). The other end of the arm 140 is provided with a shaft hole 145 into which a rotation shaft 151 (see FIG. 3) is inserted to support rotation of the wheel 150.

When the yoke 130 descends and the wheel 150 rises due to the load and the impact, the arm 140 rotates about the shaft hole 145. The first support shaft 181 is inserted and coupled to the first coupling hole 131 and the rotation limiting hole 141, and the first support shaft 181 moves along the longitudinal direction of the rotation limiting hole 141. Limit the rotation angle of 140. The rotation angle of the arm 140 is limited by the first support shaft 181 will be described in detail below.

The second support shaft 183 is inserted into and coupled to the second coupling hole 133 and the communication hole 143 integrally with the yoke 130 and the arm 140, and the second support shaft 183 is the arm. The guide 140 is lowered in the same manner as the yoke 130.

In the above-described structure in which the angled top pin 123 and the yoke 130 are coupled, the upper and lower bearings 173 and 177 and the upper and lower dust covers 175 and 179 are not installed. Reference numeral 189 is a bushing.

The shock absorbing member 160 according to the present embodiment absorbs the load and the impact while being uniformly compressed in surface contact with the rear surface of the yoke 130, which will be described with reference to FIGS. 6 is an exploded perspective view of the shock absorbing member according to an embodiment of the present invention, FIG. 7 is a cross-sectional view taken along line AA of FIG. 6, and FIGS. 8A to 8G illustrate various forms of springs of the shock absorbing member according to an embodiment of the present invention. 6 is a cross-sectional view taken along line BB of FIG. 6.

As shown, the cushioning member 160 is a hexahedral-shaped pad 161 made of rubber material and a plurality of springs 165 and pads 161 of rubber material coupled to the pad 161. It includes.

An angled rotation guide plate 187 penetrates and is installed in the pad 161, and both ends of the rotation guide plate 187 exposed to the outside of the pad 161 are guide holes 147 formed in the arm 140 (see FIG. 4). ) Is inserted. The guide hole 147 is slightly larger than the rotation guide plate 187, and the round guide protrusion 187a is formed in the rotation guide plate 187, and the same curvature as the protrusion rail 187a is formed in the guide hole 147. A guide groove 147a (see FIG. 4) having a protruding rail 187a is formed thereon. Thus, when the arm 140 is rotated by the load and the impact, the pad 161 is rotated in the same manner. Then, the pad 161 and the spring 165 placed on the pad 161 are unevenly compressed, whereby the pad 161 is opposed to the rotational direction of the arm 140 by the elastic force of the spring 165. Will rotate. That is, the protruding rail 187a and the guide groove 147a are provided to allow the pad 161 to rotate in a direction opposite to the rotational direction of the arm 140. Then, the pad 161 is always in contact with the back surface of the yoke 130 while being in contact with the pad 161 and the spring 165 is uniformly compressed. Then, when the arm 140 rotates by a predetermined angle, the first support shaft 181 is caught by the inner circumferential surface of the rotation limiting hole 141 and no longer rotates. That is, when the arm 140 rotates more than a predetermined angle, the buffer member 160 is unevenly compressed, the rotation limiting hole 141 is provided to prevent this.

In order to prevent the rotation guide plate 187 from being separated from the pad 161, as shown in FIG. 7, the separation guide hole 187b is formed in the rotation guide plate 187, and the pad 161 has a separation prevention hole ( 187).

A plurality of seating grooves 162 are formed on the back surface of the pad 161, and a spring 165 is settled in the seating grooves 162. Preferably, seven mounting grooves 162 are formed. The first seating groove 162a is formed at the center portion of the pad 161, and the second seating groove 162b and the third seating groove 162c are first symmetrically and point symmetrically based on the first seating groove 162a. 1 is formed on both outer sides of the seating groove (162a). The fourth seating groove 162d and the fifth seating groove 162e are disposed between the first seating groove 162a and the second seating groove 162b and between the first seating groove 162a and the third seating groove 162c. It is formed in the upper side between each. At this time, the fourth seating groove 162d and the fifth seating groove 162e are pre-symmetrically based on the first seating groove 162a. The sixth seating groove 162f and the seventh seating groove 162g are disposed between the first seating recess 162a and the second seating recess 162b and between the first seating recess 162a and the third seating recess 162c. It is formed in the lower side between each. At this time, the sixth seating groove 162f and the seventh seating groove 162g are also line-symmetric with respect to the first seating groove 162a. In addition, the fourth seating groove 162d, the sixth seating groove 162f, the fifth seating groove 161e, and the seventh seating groove 162g are also pre-symmetrical with respect to the first seating groove 162a. The fourth seating groove 162d, the seventh seating groove 162g, and the fifth seating groove 162e and the seventh seating groove 162f are point-symmetrical with respect to the first seating groove 162a.

By the arrangement of the seating grooves 162 as described above, the shock absorbing member 160 according to the present embodiment can appropriately adjust the number of springs 165 seated in the seating grooves 162. That is, as illustrated in FIGS. 8A to 8G, when one spring 165 is seated, the first seating groove 162a is seated, and when three springs 165 are seated, the first to first seats are seated. 3 The springs 165 are seated in the seating grooves 162a to 162c, respectively. When the six springs 165 are seated, the springs may be seated in the second to seventh seating grooves 162b to 162g except for the first seating groove 162a.

The back of the pad 161 is covered with a cap 167 of rubber material. The outer surface of the cap 167 is in surface contact with the rear surface of the yoke 130, and the inner surface is in surface contact with the rear surface of the pad 161 and the upper end of the spring 165. Cap 167 reduces the noise by preventing the top of the spring 165 is in direct contact with the back of the yoke 130. In order to couple the cap 167 to the pad 161, a coupling protrusion 167a is formed at the cap 167, and an insertion groove 163 into which the coupling protrusion 167a is inserted is formed at a rear surface of the pad 161. .

The operation of the buffer type caster according to the present embodiment configured as described above will be described with reference to FIGS. 9A to 9C. 9A to 9C show that the shock absorbing member according to an embodiment of the present invention is compressed, which is a front view of the arm side.

Assume that the state shown in Fig. 9A is the first state. In this state, when the conveying device is moved, the load and the impact act to lower the yoke 130 and the arm 140 and, conversely, the wheel 150 to rise. Due to this, the arm 140 rotates counterclockwise about the center of the wheel 150, and the shock absorbing member 160 also rotates counterclockwise. Then, the upper portion of the buffer member 160 is to be compressed more than the lower portion, wherein the pad 161 is rotated clockwise along the curved surface of the guide groove 147a by the elastic force of the spring 165. That is, the pad 161 rotates until the back surface of the yoke 130 and the pad 161 are kept parallel. That is, it will be in the state as shown in FIG. 9B.

Thereafter, when the arm 140 rotates further, as illustrated in FIG. 9C, when the upper right side surface and the lower left side surface of the rotation guide plate 187 come into contact with the inner circumferential surface of the guide hole 147, The support shaft 181 is in contact with the right side of the inner circumferential surface of the rotation restriction hole 141. Then, the arm 140 is no longer rotated. That is, the rotation limit hole 141 and the first support shaft 141 is designed such that the arm 140 is rotated only until the buffer member 160 is uniformly compressed.

In this way, when it is necessary to adjust the buffering force, the cap 167 may be removed from the pad 161, and then the appropriate number of springs 165 may be seated in the seating groove 162.

As described above, the shock absorbing caster according to the present invention absorbs the load and the impact of the rubber pad and the cap and the spring of the metal in two times, so that the buffering force of sufficient size can be obtained.

In addition, since the number of springs seated on the pad can be easily adjusted according to the load and the degree of impact, it is always possible to properly adjust the buffer force. Therefore, it is very convenient.

In addition, since the buffer member is uniformly compressed, the buffer efficiency is increased and at the same time the life of the buffer member is extended.

In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

Claims (7)

A top plate fixed to the bottom of the conveying device; A top pin fixed through the center of the top plate; A yoke coupled to the top pin positioned at the bottom of the top plate and having a front surface and a bottom surface opened and lowered in the same manner as the top pin; A nut fastened to a lower end of the top pin to support the yoke; One end side is supported on both sides of the yoke, and the other end side is exposed to the outside of the yoke to support the wheel in contact with the bottom, and the pair of the elevating and rotating the yoke of the yoke to rotate the wheel relative to the center of the wheel Arm; The front side is supported by the arm and the back is a pad of rubber material facing the back of the yoke, a plurality of springs of metal material uniformly seated on the pad, coupled to the back of the pad and the outer surface is the back and face of the yoke. A buffer member which contacts and the inner surface rotates by the arm while including a cap of a rubber material which is in surface contact with the top of the spring and the back of the pad; And, And a means for causing the shock absorbing member to be rotated in a direction opposite to the rotational direction of the arm by the elastic force of the spring so that the shock absorbing member is compressed while uniformly contacting the rear surface of the yoke. The method of claim 1, An upper recess is formed on an upper surface of the yoke, and a through hole through which the top pin penetrates is formed in the upper recess. The through-hole is a buffer type caster, characterized in that formed in the form of the rectangular through-hole and the circular through-hole protruding rounded from each of the four sides of the rectangular through-hole. The method of claim 2, The top pin is provided in a circular shape and passes through the circular through hole of the through hole, and the yoke is rotatably installed independently of the top pin. Between the top plate and the yoke and between the yoke and the nut, upper and lower bearings and upper and lower dust covers surrounding the upper and lower bearings are installed. The top plate and the top pin and the yoke and the upper and lower dust cover is inserted into each other and combined, A buffer type caster, characterized in that the embossed frame-shaped protruding downwardly formed on the portion of the top plate adjacent to the upper surface of the upper dust cover. The method of claim 2, The top pin is a buffer type caster, characterized in that provided in a shape corresponding to the shape of the rectangular through-hole of the through hole. The method of claim 1, First and second coupling holes are formed on the upper side and the lower side of the yoke, The paired arms are provided with a rotation limiting hole and a communication hole respectively communicating with the first and second coupling holes, wherein the rotation limiting hole has a predetermined length along the rotational direction of the yoke and the communication hole is the first coupling hole. Formed the same as the ball, The first coupling hole and the rotation limiting hole are coupled to a first support shaft for guiding the arm to rotate along the rotation limiting hole and limiting the rotation angle of the arm, and the second coupling hole and the communication hole. The cushioning caster, characterized in that the second support shaft for coupling the yoke and the arm integrally inserted. The method of claim 2, The pad is provided with an angled rotation guide plate penetrating the pad, and the arm is formed with a guide hole into which the rotation guide plate is loosely inserted. The means, A protruding rail protruding rounded to the rotation guide plate; The rotating guide plate is formed at a portion of the arm forming the guide hole and is in contact with the protruding rail, and is formed at the same curvature as the protruding rail so that the rotation guide plate is caused by the elastic force of the spring when the buffer member is rotated by the arm. A shock absorbing caster, characterized in that the guide groove to be rotated in the direction opposite to the rotation direction of the arm so that the buffer member is parallel to the rear surface of the yoke. The method of claim 1, The back of the pad and the front of the cap are provided with insertion grooves and engaging projections that are inserted and coupled to each other, The back of the pad is formed with the first to seventh seating groove in which the spring is seated, The first seating groove is formed in the central portion of the pad, The second seating groove and the third seating groove are formed on both outer sides of the first seating groove so as to be symmetrical and point symmetrical with respect to the first seating groove, The fourth seating groove and the fifth seating groove are respectively formed between the first seating groove and the second seating groove and between the first seating groove and the third seating groove, respectively, the fourth seating groove and the fifth seating groove. The groove is provided to be symmetrical with respect to the first seating groove, The sixth seating groove and the seventh seating groove are respectively formed on the lower side between the first seating groove and the second seating groove and between the first seating groove and the third seating groove, respectively. The groove is provided to be symmetrical with respect to the first seating groove, The fourth seating groove, the sixth seating groove, the fifth seating groove and the seventh seating groove are pre-symmetrical with respect to the first seating groove, and the fourth seating groove, the seventh seating groove, and the fifth seating groove. The seventh seating groove is a buffer type caster, characterized in that the point-symmetrical with respect to the first seating groove.