CN102975573A

CN102975573A - Luggage castor

Info

Publication number: CN102975573A
Application number: CN2011103325177A
Authority: CN
Inventors: 今野谦太郎
Original assignee: HINOMOTOJOSAKI CO Ltd
Current assignee: HINOMOTOJOSAKI CO Ltd
Priority date: 2011-09-05
Filing date: 2011-10-27
Publication date: 2013-03-20
Also published as: JP5992154B2; JP2013052755A; CN202271778U

Abstract

Provided is a luggage castor. An installation base plate is fixed on a luggage, a rotary shaft is fixed on the installation base plate, and a rotary bearing of a fork portion for supporting a wheel formed by an axle capable of rotating freely, a rim and a tire are freely and rotatably combined with the rotary shaft. The rotary shaft is formed by a fall-proof portion at the top end, an annular groove portion connected with the fall-proof portion, a cylindrical main body portion connected with the groove portion, a thick base portion connected with the main body portion and a thick and thin flange portion connected with the base portion. The rotary bearing is formed by a cylindrical shaft maintaining portion for accommodating the main body portion and an annular protrusion portion corresponding to the groove portion. The outer diameters of the main body portion and the fall-proof portion are larger than the inner diameter of the protrusion portion and slightly smaller than the inner diameter of the shaft maintaining portion. The outer diameter of the groove portion is slightly smaller than the inner diameter of the protrusion portion. For example, if the outer diameters of the main body portion and the fall-proof portion are 10mm, the inner diameter of the protrusion portion is 9.4mm. The luggage castor is high in strength, low in cost and simple to replace.

Description

Luggage castor

Technical field

The present invention relates to a kind of luggage castor, particularly a kind of luggage castor of installing and changing to the case and bag body easily.

Background technology

In the past, when being installed to castor on the case and bag, the adapter plate of castor was fixed on the case and bag by bolt, rivet from the inboard of case and bag.But, because this method install, comparatively bothersome when changing, so adopt with castor be installed to adapter plate guide housing method or be inserted into the method for installing in the hole of adapter plate by the installation shaft with castor.Below, enumerate several therewith examples of relevant prior art.

Patent documentation 1 disclosed " castor installation constitution " stability better can reclaim.Shown in Fig. 7 (a), in the axis hole 612 of the lower surface that is opened in pin body 611, be pressed into the upper end 613a of caster axle 613.Be pressed into the bottom 613b of caster axle 613 at the axis hole 614 of the upper surface open of castor body 615.Make the chimeric intensity of axis hole 614 of the bottom 613b of chimeric intensity ratio caster axle 613 of axis hole 612 of the upper end 613a of caster axle 613 and pin body 611 and castor body 615 large.

Patent documentation 2 disclosed " castor " price is low, repeatedly installing/dismounting, installation exercise are comparatively easy.Shown in Fig. 7 (b), castor 660 is installed in the foot 650 of chair, the removable chair that freely supports.By support frame 661 rotatable freely support wheel 663.With spindle unit 640 support frame 661 is installed in foot 650 by installing.Install and have bottom axial region 643 and top axial region 641 with spindle unit 640.Bottom axial region 643 rotatable free and can not be installed on support frame 661 with axially extracting.Top axial region 641 extends upward from support frame 661, is installed in the embedded hole 651 that is formed at foot 650.Be formed with screw part 642 on the peripheral part of top axial region 641, these screw part 642 diameters are larger than embedded hole 651, and are made of a plurality of spiral ridge 642c that can embed reluctantly embedded hole 651.

Patent documentation 3 disclosed " the castor structure of foot " can be easily mounted to from the horizontally extending tubular of socle foot.Shown in Fig. 7 (c), the wheel 711 rotatable free earth's axis are supported in the top of supporting yoke 712.Installation shaft 714 is fixed on the cardinal extremity of supporting yoke 712.Cylindrical bearing section 713 intercalations of castor body installation portion 716 have installation shaft 714 and remain can rotate under vertical state freely.Mounting box 715 stretches out to the direction vertical with the length direction of cylindrical bearing section 713 from castor body installation portion 716.Simple structure, the profile of castor body installation portion 716 is better.

Patent documentation 4 disclosed " the castor installation constitution of chair " outward appearance is better, and the Design freedom of talaria section is larger, and installation exercise is comparatively simple.Shown in Fig. 7 (d), the bottom 761a embedding from talaria section 761 in talaria section 761 has cover body 765.Cover body 765 locks with talaria section 761 by anticreep protuberance 767 and anti-bias protuberance 763.In the hole 766 that is arranged at cover body 765 bottom surface 765a, be pressed into the 769a of pitman section of castor 769.

Patent documentation 5 disclosed " suitcase castor " cost is low, and the replacing of castor head part is repaired comparatively simple.Shown in Fig. 7 (e), consist of castor section assembly 820 by wheel assembly 822, wheel shaft 824 and castor head 826.Consist of base portion assembly 860 by caster base 862, caster axle 864 and baseplate 866.Centre hole 826c at castor head 826 embeds caster axle 864, forms castor 800.By being arranged at respectively the tapped bore 869 on caster base 862 and the baseplate 866, by bolt etc. castor 800 is installed on the suitcase.Castor head 826 is kept by the recess 864a on the top of caster axle 864.

Patent documentation 1: Japanese kokai publication hei 07-246802 communique

Patent documentation 2; Japanese kokai publication hei 07-257107 communique

Patent documentation 3: Japanese kokai publication hei 09-240204 communique

Patent documentation 4; TOHKEMY 2002-272552 communique

Patent documentation 5; TOHKEMY 2003-146003 communique

But there are the following problems for castor in the past.Because the employed castor such as chair, hand barrow is different from the mode that applies load of luggage castor, so the replacing method of the castor of chair etc. intactly can not be applicable to case and bag.Insert the method for castor because get loose easily, so be not durable at case and bag.In the method for changing decomposing castor, the number of components of castor is more, and cost is high.Screw in the method for castor at case and bag, bolt can be obstacle to interior side-prominent the forming of case and bag when installing to case and bag.Adopt in the method for the axis of cone cost cost aspect the moulding of the axis of cone at rotary shaft.

Summary of the invention

The object of the present invention is to provide a kind of luggage castor to solve above-mentioned problem in the past, the intensity of this luggage castor can not reduce, and cost is low and can change simply.

In order to address the above problem, the invention provides a kind of luggage castor, this luggage castor has: the installation chassis that is fixed in case and bag; Be fixed in the rotary shaft of installation chassis; Have with rotary shaft can freely circle round the fork of convolution bearing of ground combination; Can be supported in fork with rotating freely, by axletree, the wheel that wheel rim and tire consist of, wherein, rotary shaft comprises the anti-delinking part on top, the slot part of the ring-type that links to each other with the anti-delinking part, the main part cylindraceous that links to each other with slot part, link to each other with main part, the base portion thicker than this main part makes progress in the footpath of this S. A., and link to each other with base portion, in the footpath of this S. A. upwards than this base portion slightly and at the axial flange part thinner than this base portion of this S. A., rotary shaft is contracted and is drawn together the axle maintaining part with the cylindric cavity of taking in main part, and the lug boss with annular projection corresponding with slot part, main part is more bigger than the internal diameter of lug boss with the external diameter of anti-delinking part, internal diameter than axle maintaining part is smaller, and the external diameter of slot part is more smaller than the internal diameter of lug boss.。Specifically, for example, the external diameter of main part and anti-delinking part is 10mm, and the internal diameter of lug boss is 9.4mm.Between main part and base portion, have lower of common use state with the upper end butt of convolution bearing pivot shaft to the planar portions of load, in the wheel side of installation chassis, has the bottom surface of when being subject to abnormal load, with the upper end butt of convolution bearing the angle of inclination of convolution bearing being limited.

According to above-mentioned structure, can not reduce the intensity of luggage castor, cost is low and can change simply.

Description of drawings

Fig. 1 is the section drawing of the luggage castor of the embodiment of the invention.

Fig. 2 is the stereoscopic figure of the luggage castor of the embodiment of the invention.

Fig. 3 is lateral plan, front view, and the upward view of the luggage castor of the embodiment of the invention.

Fig. 4 be the embodiment of the invention luggage castor rotary shaft with the convolution bearing schematic cross-section.

Fig. 5 be the embodiment of the invention luggage castor rotary shaft with the convolution bearing section drawing.

Fig. 6 is the assembling sequence figure of the luggage castor of the embodiment of the invention.

Fig. 7 is the scheme drawing of castor in the past.

The reference numeral explanation:

1... installation chassis; 2... rotary shaft; 21... anti-delinking part; 22... slot part; 23... main part; 24... base portion; 25... flange part; 3... fork; 4... convolution bearing portion; 41... axle maintaining part; 42... lug boss; 5... wheel; 51... axletree; 52... wheel rim; 53... tire.

The specific embodiment

Below, with reference to Fig. 1～Fig. 6, be described in detail being used for implementing preferred forms of the present invention.

In the luggage castor of the embodiment of the invention, rotary shaft is fixed on the installation chassis that is fixed in case and bag, be pressed into rotary shaft in the convolution bearing, this convolution bearing can be circled round freely be connected with rotary shaft and install, this rotary shaft has main part cylindraceous, the anti-delinking part on top, and the slot part of ring-type, the external diameter of described main part and described anti-delinking part is compared bigger with the internal diameter of the lug boss of the ring-type of the convolution bearing of the fork of rotatable freely support wheel, compare smallerly with the internal diameter of axle maintaining part, the external diameter of described slot part is compared smaller with the internal diameter of lug boss.

Fig. 1 represents the cross section of luggage castor.Fig. 2 and Fig. 3 represent the outward appearance of luggage castor.Fig. 4 and Fig. 5 represent the cross section of rotary shaft and convolution bearing.Fig. 6 represents the assembling sequence of luggage castor.

In Fig. 1～Fig. 6, installation chassis 1 is a kind of base component that is fixed in case and bag.Rotary shaft 2 be a kind ofly be fixed in installation chassis, can circle round freely keeps the parts of wheel, consisted of by the anti-delinking part 21 on top, the ring-type slot part 22 that links to each other with the anti-delinking part, the main part cylindraceous 23 that links to each other with slot part, the thick base portion 24 that links to each other with main part and the thick and thin flange part 25 that links to each other with base portion.Main part is more bigger than the internal diameter of lug boss, more smaller than the internal diameter of axle maintaining part with the external diameter of anti-delinking part.The external diameter of slot part is more smaller than the internal diameter of lug boss.Fork 3 is a kind of rotatable parts that freely wheel kept and can circle round and freely be connected with rotary shaft.Convolution bearing 4 is parts of circling round and freely being combined with rotary shaft in the fork, and convolution bearing 4 is made of the lug boss 42 of the axle maintaining part 41 of the cylinder cavity shape of taking in main part and the ring-type corresponding with slot part.Wheel 5 is made of axletree 51, wheel rim 52 and tire 53, and it is a kind of rotatable parts that freely are supported in fork.

Function and action to the luggage castor that constitutes the aforesaid embodiment of the invention describe.At first, with reference to Fig. 1～Fig. 3, the summary of luggage castor is described.Insert molding and the installation chassis 1 that is fixed with metal rotary shaft 2 are fixed on the case and bag.The top of rotary shaft 2 has anti-delinking part 21, and what link to each other with anti-delinking part 21 is the slot part 22 of ring-type, and what link to each other with slot part 22 is main part 23 cylindraceous, and what link to each other with main part 23 is thicker base portion 24, and what link to each other with base portion 24 is thick and thin flange part 25.Load is applied between the base portion 24 of the convolution upper surface of bearing 4 and rotary shaft 2.Also be applied with bend loading between rotary shaft 2 and the convolution bearing 4.

Fork 3 has the convolution bearing 4 that can circle round and freely be combined with rotary shaft 2.Convolution bearing 4 is made of the lug boss 42 of the axle maintaining part 41 of the cylinder cavity shape of taking in main part 23 and the ring-type corresponding with slot part 22.Main part 23 is more bigger than the internal diameter of lug boss 42, more smaller than the internal diameter of axle maintaining part 41 with the external diameter of anti-delinking part 21, and the external diameter of slot part 22 is more smaller than the internal diameter of lug boss 42.So-called bigger, smaller refer to have can not produce cough up the sound of rattling away, the gap of the degree of rotation smoothly.Specifically, for example, main part 23 is 10mm with the external diameter of anti-delinking part 21, and the internal diameter of lug boss 42 is 9.4mm.Wheel 5 is made of axletree 51, wheel rim 52 and tire 53, its rotatable fork 3 that freely is supported in.

Then, with reference to Fig. 4, the rotary shaft of luggage castor and the structure of convolution bearing are described.Fig. 4 (a) schematically shows the structure of rotary shaft and convolution bearing.Rotary shaft 2 insert moldings are in installation chassis 1.Because this structure is so rocking of rotary shaft 2 is little, comparatively quiet.Rotary shaft 2 can be pressed in the buckle mode that does not need special fixtures the convolution bearing 4 of fork 3, assembles.The load support part on convolution bearing 4 tops does not need packing ring, bearing, bearing support.Therefore, there is not the rotation sound of bearing itself, comparatively quiet.In addition, the variety of components number is less, and cost is low.

Between the main part 23 and base portion 24 of rotary shaft 2, have upper end 4A butt at lower of common use state and convolution bearing 4, pivot shaft to the planar portions 2A of load.The planar portions 2A of rotary shaft 2 is slightly higher than the bottom surface 1A of installation chassis 1, and convolution bearing 4 rotates at the planar portions 2A of rotary shaft 2 as the 1B of load support section usually.Because the radius of friction portion is little, so the distance that contacts and produce on the circumference that rubs when convolution is shorter, friction drag diminishes.In addition, metal is compared little with the friction drag mutual with metal, that rigid plastic is mutual of the friction drag between the rigid plastic.Therefore, noise is little, and the rotation of convolution bearing 4 is better, fluent movements.In the wheel side of installation chassis 1, has when being subject to abnormal load the bottom surface 1A that limits with the upper end 4A butt of convolution bearing 4, to the angle of inclination of convolution bearing 4.

Fig. 4 (b) schematically shows the distortion state of rotary shaft and convolution bearing.Because axially departing from of load direction and rotary shaft 2, so have axial load and lateral load.Axial load as mentioned above, the planar portions 2A by rotary shaft 2 supports, lateral load supports by the moment of deflection of rotary shaft 2.As applying sideling when impacting, apply in the situation of stronger load in the horizontal, the upper end 4A of convolution bearing 4 is connected to the bottom surface 1A of installation chassis 1.Like this, when the load on the tilted direction when a certain fixed value is above, directly support with installation chassis 1 without rotary shaft 2, thus, rotary shaft 2 by moment of deflection avoid the damage.

Then, with reference to Fig. 5, the rotary shaft of luggage castor and the concrete structure of convolution bearing are described.The typical size of Fig. 5 (a) expression rotary shaft 2 and convolution bearing 4.The amount of lap of the anti-delinking part 21 of rotary shaft 2 is one-sided 0.3mm～0.4mm.Pressing-in force under this size and Nai Tuoli are balance and are worth preferably, are easy to assemble and can not damage.For the vertical direction pulling capacity of (axially), the lug boss 42 of the anti-delinking part 21 of rotary shaft 2 and convolution bearing 4 can not be extracted thereby remain with the width butt of 0.3mm.Make on the axial thickness of lug boss 42 to have surplus, thereby keep the intensity of convolution bearing 4.For the power of horizontal (square with the axis direction), the inboard butt of the lug boss 42 of the slot part 22 of rotary shaft 2 and convolution bearing 4 prevents lateral deformation.Make on the thickness of radial direction of lug boss 42 to have surplus, thereby keep the intensity of convolution bearing 4.The object lesson of the shape of Fig. 5 (b) expression rotary shaft 2 and convolution bearing 4.

Then, with reference to Fig. 6 the assemble method of luggage castor is described.Shown in Fig. 6 (a), make the top of the top aligning rotary shaft 2 of convolution bearing 4.Shown in Fig. 6 (b), the tapering guiding on the top by convolution bearing 4 is also inserted the anti-delinking part 21 on the top of rotary shaft 2.Shown in Fig. 6 (c), anti-delinking part 21 and the main part 23 of rotary shaft 2 is inserted into the axle maintaining part 41 of convolution bearing 4.Shown in Fig. 6 (d), lug boss 42 butts of the anti-delinking part on the top of rotary shaft 2 21 and convolution bearing 4, stop.Shown in Fig. 6 (e), when pressing to convolution bearing 4 application of forces, elastic deformation occurs in lug boss 42, and rotary shaft 2 is pressed into.Metal anti-delinking part 21 is out of shape hardly.When the convolution bearing 4 continuation application of forces were pressed, shown in Fig. 6 (f), lug boss 42 was crossed in anti-delinking part 21, and lug boss 42 is embedded into slot part 22, is stably kept.Because have anti-delinking part 21, so can not extract simply.When oppositely applying larger power, then become the state shown in Fig. 6 (e), can extract.Perhaps, can also constitute 42 of lug bosses that do not destroy convolution bearing 4 can not extract, and it also can guarantee in use never to come off.

As mentioned above, in an embodiment of the present invention, because luggage castor constitutes: have main part cylindraceous, the anti-delinking part on top, and the rotary shaft of the slot part of ring-type, be fixed on the installation chassis that is fixed in case and bag, be pressed into rotary shaft in the convolution bearing, this convolution bearing can be circled round freely be connected with rotary shaft and install, the external diameter of described main part and anti-delinking part is compared bigger with the internal diameter of the lug boss of the ring-type of the convolution bearing of the fork of rotatable freely support wheel, compare smaller with the internal diameter of axle maintaining part, the external diameter of described slot part is compared smaller with the internal diameter of lug boss, so, can not reduce the intensity of luggage castor, cost is low and can change simply.

The industry utilizability:

Luggage castor of the present invention is suitable for use as the castor that is installed on traveling bag etc. most.Also be suitable as the castor of other article except case and bag.

Claims

1. luggage castor, this luggage castor has: the installation chassis that is fixed in case and bag; Be fixed in the rotary shaft of described installation chassis; Have with described rotary shaft can freely circle round the fork of convolution bearing of ground combination; Can be supported in described fork with rotating freely, by axletree, the wheel that wheel rim and tire consist of, this luggage castor is characterised in that, described rotary shaft comprises the anti-delinking part on top, the slot part of the ring-type that links to each other with described anti-delinking part, the main part cylindraceous that links to each other with described slot part, link to each other with described main part, the base portion thicker than this main part makes progress in the footpath of this S. A., and link to each other with described base portion, in the footpath of this S. A. upwards than this base portion slightly and at the axial flange part thinner than this base portion of this S. A., described rotary shaft is contracted and is drawn together the axle maintaining part with the cylindric cavity of taking in described main part, and the lug boss with annular projection corresponding with described slot part, described main part is more bigger than the internal diameter of described lug boss with the external diameter of described anti-delinking part, internal diameter than described axle maintaining part is smaller, and the external diameter of described slot part is more smaller than the internal diameter of described lug boss.

2. luggage castor according to claim 1 is characterized in that, the external diameter of described main part and described anti-delinking part is 10mm, and the internal diameter of described lug boss is 9.4mm.

3. luggage castor according to claim 1, it is characterized in that, between described main part and described base portion, have lower of common use state with the upper end butt of described convolution bearing pivot shaft to the planar portions of load, in the wheel side of described installation chassis, have when being subject to abnormal load and the upper end butt of described convolution bearing and bottom surface that the angle of inclination of described convolution bearing is limited.