JPH0439762Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a caster that is used by being attached to the lower part of a chair or other furniture or an audio rack.

An example of a caster conventionally used attached to the lower part of furniture, etc., in which the shafts of a pair of wheels disposed on both sides of the shaft support are attached to the shaft support is disclosed in Japanese Utility Model Publication No. 53-10768. has been disclosed. This can be easily installed by simply pushing a portion of the shaft provided on the wheel into the shaft hole through its opening. However, since the large-diameter parts provided at the ends of the shafts of the pair of wheels are butt-shaped and inserted into the grooves provided on the circumferential surface of the shaft hole, the tips of the shafts are aligned with each other during rotation of the pair of wheels. There is a problem in that the wheels contact each other and cause friction, resulting in uneven rotation of each wheel. In addition, there is another caster disclosed in Japanese Patent Publication No. 13866/1983,
This requires a means for attaching the locking member, which is locked to the large diameter portion of the shaft, to the shaft support from the lower side of the shaft, which poses a problem in that assembly is time-consuming.

The caster according to the present invention was devised in view of these conventional problems, and it is possible to easily and securely attach the shafts of a pair of wheels to a shaft support, and also to prevent the rotation of the pair of wheels. The purpose is to eliminate the problem of the shaft tips coming into contact with each other and causing friction during operation, resulting in a lack of smooth rotation of each wheel.

The caster according to the present invention that achieves these objectives will be explained based on the attached drawings. It is formed from a synthetic resin body into a thick plate shape, and the lower side of the shaft support 1, which is vertically installed, is horizontally A shaft hole 2 is provided through the shaft hole 2 in its thickness direction, and has an opening 3 that opens toward the bottom and has an opening width equal to the inner diameter of the shaft hole 2 along the entire length of the lower half in the length direction. A shaft hole 2 is formed in the center of the shaft hole 2, leaving both ends in the axial direction.
A concave stepped portion 4 that is open toward the lower side of a square bottom shape, the depth from the lower end surface of the shaft support body 1 is deeper than that of the shaft hole 2, and the opening width is larger than the inner diameter of the shaft hole 2. is formed in the recessed step 4, and a metal plate is formed into a U-shaped cross section, and the opening width is wider on the back side than the mouth side on both opposing walls bent from both ends of the connecting wall 7. The locking member 5, which has a pair of locking recesses 6, 6 facing each other that are open toward the free end of the bottom, has the connecting wall 7 on the upper side, and a pair of locking recesses provided on both opposite walls. 6, 6 facing downward, and both opposing walls facing the inner diameter direction of the shaft hole 2, the connecting wall 7 is connected to the bottom surface of the recessed step 4, and the upper sides of both opposing walls are connected to the recessed step. The engaging means provided on one of the mutually abutting surfaces of the recessed stepped portion 4 and the locking member 5 are brought into contact with the opposing side surfaces remaining above the shaft hole 2 of the portion 4 in the inner radial direction. One is attached to the other of the engagement means provided on the other, and the shaft support 1
A pair of shafts 9, 9 are provided on both sides of the wheels 8, 8, and the shafts 9, 9 are provided protruding from the axes of the disc-shaped bodies of the wheels 8, 8, and the outer diameters are formed in such a size that they can rotate within the shaft hole 2. The locking member 5 is inserted through the lower opening 3 of the shaft hole 2.
An annular shape is formed on the outer peripheral surface of the tip of the shafts 9, 9, and the outer diameter of this portion is larger than the opening width on the mouth side of the locking recesses 6, 6 of the locking member 5, and smaller than the opening width on the inner side. The locking grooves 10, 10 of are forcibly engaged with the pair of locking recesses 6, 6, and the shafts 9, 9 are installed with a gap between their tip surfaces, and further, they are installed above one side of the shaft support 1. It is characterized in that the shaft 17 is erected.

In such a caster, after the shafts 9, 9 of the pair of wheels 8, 8 are attached to the shaft support 1 in the recessed step 4 in which the locking member 5 is communicated with the shaft hole 2,
These shafts 9, 9 are also inserted into the shaft hole 2 through the opening 3 which communicates with the shaft hole 2, and the locking groove 10 of the shafts 9, 9 is inserted into the locking member 5 into the pair of locking recesses 6, 6. The shafts 9, 9 are forcibly engaged with each other, and the shafts 9, 9 are mounted with a space between their end surfaces.

The details of the caster according to the present invention will be further explained based on the attached FIGS. 1 to 5.

First, reference numeral 1 in the figure is a shaft support that is formed from a synthetic resin body into a thick plate shape and is vertically installed. In the illustrated embodiment, the upper end surface including both sides of the shaft support 1 is formed into a semicircular shape, and the lower end surface is formed into a flat surface. As shown in FIG. 1, a shaft hole 2 is provided in the lower side of the shaft support 1 horizontally through its thickness.
As shown in FIG. 2, the lower half has an opening 3 which is opened toward the bottom and whose opening width is the same as the inner diameter of the shaft hole 2 over the entire length of the lower half. As shown in the figure, the central part leaving both ends in the axial direction communicates with the shaft hole 2, so that the depth from the lower end surface of the shaft support 1 is deeper than that of the shaft hole 2, and the opening width is larger than that of the shaft hole 2. A concave stepped portion 4 is formed which is open toward the bottom and has a square bottom shape larger than the inner diameter. Next, numeral 5 in the figure is a locking member attached to this recessed step 4, which is formed from a metal plate and has a U-shaped cross section as shown in FIG.
As shown in the figure, the opposing walls bent from both ends of the connecting wall 7 have a pair of locking recesses that open toward the free end and have a bottom whose opening width is wider on the back side than on the mouth side. 6, 6 are provided facing each other.
Then, the locking member 5 is attached to the recessed step portion 4 of the shaft support 1.
However, with the connecting wall 7 facing upward and the openings of the pair of locking recesses 6, 6 provided on both opposing walls facing downward, and with both opposing walls facing in the inner diameter direction of the shaft hole 2,
The connecting wall 7 is brought into contact with the bottom surface of the recessed step part 4, and the upper sides of both opposing walls are respectively brought into contact with the opposing side surfaces remaining above the shaft hole 2 of the recessed step part 4 in the inner radial direction. The locking member 5 is attached so that one of the engaging means provided on one of these mutually abutting surfaces engages with the other of the engaging means provided on the other side. In the illustrated embodiment, the locking member 5 is attached to the recessed step 4 of the shaft support 1 on the upper side in the inner diameter direction of the shaft hole 2 of the recessed step 4, as shown in FIGS. 1 and 5. A U-shaped cut is formed by cutting into the upper side of both opposing walls of the locking member 5 on one side of the engagement means that utilizes the recess-like engagement steps 13 formed on the opposing sides of the locking member 5. This is achieved by engaging the other of the engagement means using the protrusion 12 that engages with the engagement step 13 that is pushed out.

Further, reference numerals 8 and 8 in the figure represent a pair of wheels disposed on both sides of the shaft support 1. Furthermore, 9 is a pair of wheels 8,8
This is a shaft that protrudes from the axis of the disc-shaped main body, and its outer diameter is formed in a size that allows it to rotate within the shaft hole 2, and the outer circumferential surface of its tip has the outer diameter of this part. Annular locking grooves 10, 10 are formed which are larger than the opening width on the mouth side of the locking recesses 6, 6 of the locking member 5, and smaller than the opening width on the inner side.
The radius of the disc-shaped main body of the wheel 8 is smaller than the length between the axis of the shaft hole 2 of the shaft support 1 and the upper end surface including both sides thereof. and,
A pair of wheels 8, 8 disposed on both sides of the shaft support 1 is connected to a locking member 5 attached to the recessed step 4 of the shaft support 1.
Then, the shafts 9, 9 are inserted through the opening 3 on the lower side of the shaft hole 2, and the locking grooves 10, 10 formed on the outer peripheral surfaces of the tips of the shafts 9, 9 are inserted into the pair of locking recesses 6, 6. The shafts 9, 9 are forcibly interlocked and installed with a space between the end surfaces of the shafts 9, 9. In the figure, reference numeral 11 denotes a connecting pin formed from a metal rod that is installed in a construction manner by inserting both ends into the tips of the shafts 9, 9 facing each other with a gap between the opposite walls of the locking member 5. . Also, 16 is the shaft support 1
A cover 17 is formed into a semi-cylindrical shape from a synthetic resin body and is attached to the upper end surface including both sides of the caster. This is the mounting shaft.

Therefore, such a caster is assembled as shown below. First, the locking member 5 is placed in the recessed step 4 of the shaft support 1, with the connecting wall 7 facing upward, and the openings of the pair of locking recesses 6, 6 provided on both opposing walls facing downward. Both opposing walls are oriented in the inner radial direction of the shaft hole 2, and the connecting wall 7 is brought into contact with the bottom surface of the recessed step 4, and the upper side of both opposing walls is oriented in the inner radial direction of the shaft hole 2 of the recessed step 4. Recess-like engaging step portions 13 are formed in contact with opposing side surfaces remaining on the upper side, and further formed on opposing side surfaces remaining above the shaft hole 2 in the inner diameter direction of the recessed step portion 4. The locking member 5 is mounted by forcibly engaging one of the engaging means using the protrusions 12 provided on the upper sides of both opposing walls of the locking member 5 with the other engaging means using the protrusions 12. Next, both ends of the connecting pin 11 are inserted into the tips of the shafts 9, 9 of the pair of wheels 8, 8. Then, the shafts 9, 9 of the pair of wheels 8, 8 are inserted from the lower side of the shaft hole 2 through the opening 3 that communicates with the shaft hole 2, and the locking member 5 has a hole formed on the outer peripheral surface of the tip of the shaft 9, 9. The locking grooves 10, 10 are forcibly engaged with the pair of locking recesses 6, 6, and the shafts 9, 9 are mounted with a space between the end surfaces of the shafts 9, 9 between the opposing walls. Thereafter, the cover 16 and the mounting shaft 17 are attached to the shaft support 1 to complete the assembly. Here, after the pair of wheels 8, 8 are attached to the locking member 5, they can also be attached to the shaft support 1. For these reasons, in this caster,
The pair of wheels 8, 8 can be mounted by forcibly meshing with the locking member 5 that attaches the shafts 9, 9 to the shaft support 1, and the locking member 5 is also attached to the recessed step of the shaft support 1. Since one of the engaging means provided on one of these mutually abutting surfaces can be forcibly engaged with the other of the engaging means provided on the other side of the part 4, assembly is easy. , and it can be done reliably. Moreover, since the upper side of the locking member 5 is inserted and attached into the recessed step 4 of the shaft support 1, the locking member 5, that is, the pair of wheels 8, 8 will fall off from the shaft support 1 during use. There is no problem. Furthermore, since the shafts 9, 9 of the pair of wheels 8, 8 are attached to both opposing walls bent from both ends of the connecting wall 7 of the locking member 5 and spaced apart by at least the connecting wall 7, the shafts 9, 9 , 9 can be spaced apart, and there is no longer a problem that the tips of the shafts 9, 9 come into contact with each other during rotation of the pair of wheels 8, 8, causing friction, and the wheels lack smooth rotation. It is.

By the way, the engagement means provided on the surfaces of the recessed step portion 4 of the shaft support 1 and the locking member 5 that contact each other are as follows.
In addition to providing the projections 12 as shown in FIGS. 1 and 5, as shown in FIG. The other of the engagement means may be provided by forming recess-like engagement steps 13 on both opposing walls of the stop member 5 to engage with the protrusion 12. Further, as shown in FIG. 7, a mounting pin 15 is integrally formed on the bottom surface of the recessed step 4 of the shaft support 1 to provide one side of the engagement means, and a mounting pin 15 is provided on the connecting wall 7 of the locking member 5. It is also possible to provide the other engaging means by forming a mounting hole 14 through which the fitting 15 is inserted.

In the caster according to the present invention as described above, the pair of wheels 8, 8 are connected to the locking member 5 attached to the shaft support 1.
A locking groove 1 formed on the outer peripheral surface of the tip of the shaft 9, 9
0 and 10 can be forcibly engaged and attached to the pair of locking recesses 6 and 6, and the shaft support 1
The locking member 5 is inserted from below into the recessed step 4 and installed by engaging one of the engaging means provided on one of these mutually abutting surfaces with the other of the engaging means provided on the other side. This allows for easy and reliable assembly. In addition, the recessed step portion 4 of the shaft support 1
Since the upper side of the locking member 5 is inserted and attached within the shaft support 1, there is no problem of the locking member 5, that is, the pair of wheels 8, falling off from the shaft support 1 during use.
Further, the shafts 9, 9 of the pair of wheels 8, 8 are connected to the locking member 5.
Since it is attached to both opposing walls that are bent from both ends of the connecting wall 7 and spaced apart by at least the length of the connecting wall 7, it is possible to leave a gap between the tip surfaces of the shafts 9, 9, and the tips of the shafts 9, 9 This eliminates the problem of wheels coming into contact with each other and causing friction, resulting in the wheels not rotating smoothly.

[Brief explanation of the drawing]

FIG. 1 is a vertical front view showing a caster according to the present invention, FIG. 2 is a vertical side view, FIG. 3 is a bottom view, and FIG. 4 is an enlarged perspective view showing a locking member.
FIG. 5 is an enlarged sectional view showing an engaging means provided between the shaft support and the locking member, and FIGS. 6 and 7 are enlarged sectional views showing other examples of the engaging means, respectively. 1... Shaft support body, 2... Shaft hole, 3... Opening, 4
... recessed step, 5 ... locking member, 6 ... locking recess,
8... Wheel, 9... Shaft, 10... Locking groove, 12
...Protrusion, 13...Engagement step, 14...Mounting hole,
15...Mounting pin.

Claims (1)

[Scope of utility model registration request] A shaft hole 2 formed horizontally through the lower side of a shaft support 1, which is formed into a thick plate shape from a synthetic resin body and erected in a vertical direction, in the thickness direction thereof.
However, the opening 3 is opened toward the bottom and the opening width is the same as the inner diameter of the shaft hole 2 along the entire length of the lower half.
The central part of the shaft hole 2, leaving both ends in the axial direction, communicates with the shaft hole 2 so that the depth from the lower end surface of the shaft support 1 is deeper than that of the shaft hole 2, and the opening width is smaller than that of the shaft hole 2. A recessed step 4 with a square bottom that is larger than the inner diameter of the hole 2 and open toward the bottom is formed, and a metal plate having a U-shaped cross section is formed in the recessed step 4, and a connecting wall 7 is bent from both ends thereof. A locking member in which a pair of locking recesses 6, 6, which are open toward the free end side and are opposite each other, are provided on both curved opposing walls, and the opening width is wider on the back side than on the mouth side. 5, with the connecting wall 7 facing upward and the openings of the pair of locking recesses 6, 6 provided on both opposing walls facing downward, and with both opposing walls facing in the inner diameter direction of the shaft hole 2, The connecting wall 7 is brought into contact with the bottom surface of the recessed step part 4, and the upper sides of both opposing walls are respectively brought into contact with the opposing side surfaces remaining above the shaft hole 2 of the recessed step part 4 in the inner radial direction. and the locking member 5 is attached by engaging one of the engaging means provided on one of these mutually abutting surfaces with the other of the engaging means provided on the other side,
A shaft protruding from the axis of the disc-shaped main body of a pair of wheels 8, 8 disposed on both sides of the shaft support 1, and having an outer diameter such that it can rotate within the shaft hole 2. 9, 9 from the lower opening 3 of the shaft hole 2,
In the locking member 5, the outer diameter of this portion formed on the outer circumferential surface of the tip of the shafts 9, 9 is larger than the opening width on the mouth side of the locking recesses 6, 6 of the locking member 5, and the opening is on the inner side. The annular locking grooves 10, 10, which are smaller than the width, are forcibly engaged with the pair of locking recesses 6, 6, and the shafts 9, 9 are installed with a space between the tip surfaces, and further, one part of the shaft support 1 is installed. A caster with a mounting shaft 17 erected on the upper side.