JP5882113B2 - Infant bicycle - Google Patents

Description

  The present invention relates to an infant-mounted bicycle provided with a pistol-type chain case in which an infant seat is installed on an upper portion of a rear wheel and covers an upper side of a drive chain stretched between a crank sprocket and a rear sprocket.

  Conventionally, in a two-wheeled vehicle such as a bicycle, a drive chain is stretched between the crank sprocket and the rear sprocket in order to transmit the rotational driving force from the crank sprocket to the rear sprocket of the rear wheel. A chain case is attached to cover the periphery of the drive chain in order to prevent adhesion of mud, dust and the like to the drive chain, or to prevent an occupant's feet from wrapping around the drive chain. A completely sealed all case that covers the entire drive chain is also used, but when carrying out maintenance inspections of the drive chain or hanging the drive chain off the sprocket, the entire case must be removed, which is cumbersome. Met. Not only that, but in all cases the weight increased.

  Therefore, in order to reduce the weight of the chain case, there has been proposed a pistol type chain case attached as disclosed in the rear part mounting structure for a bicycle half-face chain case described in Patent Document 1 below. Further, there has also been proposed one in which a chain guide for preventing adhesion of mud that the rear wheel shakes down only on the lower side of the drive chain, as disclosed in a motorcycle chain guide described in Patent Document 2 below, has been proposed.

  The rear part mounting structure of the half-chain chain case for a bicycle disclosed in Patent Document 1 will be described with reference to FIG. 5. A chain 105 stretched between a front gear (crank sprocket) 102 and a rear gear (rear sprocket) 104. A pistol-type chain case 101 that covers the outer surface and the upper side of the circular gear cover 103 that covers the outer surface of the front gear 102, and extends outward from the gear cover 103, and the outer surface of the chain 105 And a chain cover 106 covering the upper side. An insertion hole 108 through which the crankshaft 107, the crank, and the like are inserted is formed in the center of the gear cover 103, and the gear cover 103 is supported on the crankshaft 107 by a boss 117 of the case mounting bracket 118. An engagement member 112 is provided on the inner side of the rear portion of the chain cover 106, and the engagement portion 112 a of the engagement member 112 is one-touched to the engagement portion 112 a of the attachment member 111 that is installed upright at a corresponding position of the chain stay 110. It can be attached with.

  The motorcycle chain guide disclosed in Patent Document 2 will be described with reference to FIG. 6. In a motorcycle in which an output sprocket 204 of an engine and a sprocket 205 of a rear wheel are connected by a chain 206 and driven, (Chain stay) A guide case 207 having a long and inverted U-shaped cross section is attached to the lower side of the chain stay 203, a guide piece 208 for guiding the chain 206 is attached to the rear lower end of the guide case 207, and the guide case 207 is attached to the rear wheel 201. It arrange | positions so that it may arrange | position to the front side.

Utility Model Registration No. 30655580 (see abstracts, etc.) Japanese Utility Model Publication No. 4-106096 (see abstracts, etc.)

  On the other hand, in recent years, an electric assist bicycle that obtains auxiliary power by the driving force of an electric motor has been widely used, and accordingly, an electric assist bicycle as an infant-mounted bicycle has also appeared. Although not limited to electrically assisted bicycles, a device for a chain case as an infant-loaded bicycle is also required. In the rear half-chain chain case rear mounting structure described in Patent Document 1 described above, the number of parts is small, assembly workability is good, and rigidity is high, without requiring a special fastener such as a screw. A pistol-type chain case that does not get caught in clothing, has a good appearance, is lightweight and light, and is easy to maintain the chain can be realized. However, when such a rear half-chain chain case mounting structure for a bicycle is applied to an infant-mounted bicycle, an infant seat is usually installed at or near the rear wheel where the rear gear 104 is located. If the foot of the infant seated on the infant seat slips off from the footrest step, or if the footrest step breaks and falls off, there is a risk of being caught under the chain 105 .

  The motorcycle chain guide described in Patent Document 2 is not configured to place an infant on the upper part of the rear wheel. Therefore, if the infant is seated on the rear part of the seat, the rear wheel Even if the guide case 207 that covers the lower side of the chain 206 is attached to the lower part of the rear fork 203 in order to prevent adhesion of mud soil and the like that is shaken off, there is still a risk that the foot will be caught on the upper side of the chain 206, It was inappropriate as a motorcycle for infants. In addition, the guide case 207 attached to the lower portion of the rear fork 203 has a complicated structure such as attaching a guide piece 208 having an inverted U-shaped cross section to guide the chain 206.

  Therefore, in the present invention, the problems of the conventional infant-mounted bicycle are solved, and the advantage of the pistol type chain case is left as it is, and there is no possibility that the infant's foot is caught in the drive chain by a simple additional improvement. The purpose is to provide a simple and safe bicycle for infants.

For this reason, the present invention provides an infant-mounted bicycle provided with a pistol-type chain case in which an infant seat is installed on an upper portion of a rear wheel and covers an upper side of a drive chain stretched between a crank sprocket and a rear sprocket. the drive chain - lower chain guards for covering the lower side of the emission in the form that is vertically from the chain stays at its ends near to being attached along the chain stay. Further, the present invention is characterized in that the lower chain guard is attached to an area in the vicinity of a footrest step position corresponding to at least the infant seat. Further, the present invention is characterized in that the lower chain guard is configured to cover almost all of the exposed portion on the lower side of the drive chain. Further, the present invention is characterized in that at least a rear wheel diameter of a bicycle to which the lower chain guard is attached is 24 inches or less. Further, the present invention is characterized in that the upper edge of the lower chain guard is bent toward the drive chain, and these are used as means for solving the problems.

According to the present invention, the infant seat is installed on the upper part of the rear wheel, which is the constituent element of claim 1, and covers the upper side of the drive chain stretched between the crank sprocket and the rear sprocket. in infants loaded bicycle equipped with a pistol chain case, the drive chain - lower chain guards for covering the lower side of the emission in the form that is vertically from the chain stays at its both ends near, mounted along the chain stay By attaching a lower chain guard that covers the underside of the drive chain to an existing member without retrofitting the advantages of a pistol-type chain case that is lightweight, good-looking, and easy to maintain, An infant-mounted bicycle with a safe and simple structure that does not involve an infant's foot can be realized.

  Further, the lower chain guard, which is a constituent element of claim 2, is attached to at least a footrest step position area corresponding to the infant seat, and the infant seated on the infant seat is in a stationary seat. Even if the foot is stepped off from the footrest step in the vehicle posture, there is no possibility that the infant's foot is caught under the drive chain. Furthermore, in the case where the lower chain guard is configured to cover almost all of the exposed portion of the lower side of the drive chain, the lower chain guard is seated on the infant seat. When the infant's feet that ride on the chain stay on the chain stay, the infant's feet can be prevented from being caught in the drive chain over a wide range even if the feet are moved greatly from the footrest step and stepped off.

  Furthermore, when the wheel diameter of at least the rear wheel of the bicycle to which the lower chain guard is attached is 24 inches or less, which is a constituent requirement according to claim 4, at least the rear wheel has a relatively small wheel diameter. This makes it possible to reduce the ground clearance on the rear wheel side on which the infant seat is mounted, making it easier for infants to ride over, enabling little more left and right swinging of the infant seat, and enabling more stable travel, and a bicycle with an infant As a result, the function can be dramatically improved. Moreover, when the wheel diameter of a rear wheel is made into a small diameter, since the position of an infant's foot comes below, the effect of preventing the foot from being caught is exhibited by attaching the lower chain guard. In addition, when the upper edge of the lower chain guard is bent to the drive chain side, which is a constituent requirement of claim 5, the drive chain is blindfolded by a line of sight from the upper side, and the appearance is excellent. Since the bent portion covers the drive chain from above, the chance of the infant's foot being caught is further reduced.

It is a principal part perspective view of the second half part which shows 1st Example of the infant carrying bicycle of this invention. It is a principal part expansion perspective view which shows the attachment state of a side view and a lower chain guard. It is a side view, AA sectional drawing, and a perspective view of a lower chain guard. It is a principal part side view of the second half part which shows 2nd Example of the infant carrying bicycle of this invention. It is explanatory drawing of the half surface chain case for bicycles described in patent document 1 of the 1st prior art example. It is explanatory drawing of the chain guide of the motorcycle described in patent document 2 of the 2nd prior art example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out an infant-mounted bicycle according to the invention will be described with reference to the drawings. As shown in FIG. 1, the infant-mounted bicycle according to the present invention has an infant seat 8 installed on the upper portion of the rear wheel 2, and a crank sprocket 19 and a rear sprocket 21 (in FIG. 1, on the back side of the rear end claw plate of the chain stay 6). In the infant-mounted bicycle provided with the pistol type chain case 10 that covers the upper side of the drive chain 22 that is stretched between the drive chain 22 and the lower part that covers the lower side of the drive chain 22. The chain guard 17 is characterized in that it is attached along the chain stay 6 in the form of being suspended from the chain stay 6 in the vicinity of both ends thereof.

  1 to 3 show a first embodiment of an infant-mounted bicycle according to the present invention. In this embodiment, as shown in FIG. 1, the lower chain guard 17 is at least a foot corresponding to the infant seat 8. It is attached to a region near the position of the loading step 23. As shown in the side view of the rear half of the infant-mounted bicycle and the attached state of the lower chain guard, as shown in FIG. 2, the rear of the main pipe 3 having a head pipe at its front end that supports the front wheel (not shown) so that it can turn freely. A hanger portion is formed at the end portion, and the crankshaft 13 is rotatably supported. The seat pipe 4 is connected to stand up rearward from the hanger part, and the chain stay 6 is connected horizontally toward the rear wheel shaft 16 side. A rear hawk 5 is connected between a claw plate 6 </ b> C formed at the rear end portion of the chain stay 6 and the upper end portion of the seat pipe 4. A seat post having a saddle 1 installed at the upper end is inserted into the seat pipe 4 so as to be freely stretchable and tightenable.

  Further, a curved tubular rear carrier 7 is provided across the rear end claw plate 6C of the chain stay 6 and the rear fork 5, and an infant seat 8 is mounted and installed on the upper portion of the rear carrier 7. Reference numeral 9 denotes an infant handle that is formed toward the front upper part of the seating portion of the infant seat 8 and that the infant grasps with fingers. In the illustrated example, the rear carrier 7 is further extended from the connecting portion of the rear carrier 7 to the rear fork 5 to the chain stay 6 by an arcuate frame and connected to the chain stay 6 (see FIG. 1). A footrest step 23 on which the infant's feet are placed is formed in the lower front portion of the infant seat 8. The footrest step 23 is arranged and formed corresponding to the infant seat 8. That is, in the illustrated example, it is formed integrally with the infant seat 8, but, for example, it is fastened together with the rear end claw plate 6C of the chain stay 6 with respect to the rear wheel shaft 16 (FIG. 2B). The footrest step 23 can also be attached.

  As described above, there is a drive chain 22 between the crank sprocket 19 that is fixed to the crankshaft 13 that constitutes the hanger portion and is pivotally supported by the hanger portion, and the rear sprocket 21 that is fixed to the rear wheel shaft 16. Is suspended and stretched, and the pistol type chain case 10 is installed so as to cover the upper side of the crank sprocket 19 and the drive chain 22. The upper side of the drive chain 22 refers to the side located at the upper part from the rear sprocket 21 toward the crank sprocket 19 when traveling forward, and the lower side of the drive chain 22 refers to the lower part from the crank sprocket 19 toward the rear sprocket 21 side during forward travel. The side located in The pistol type chain case 10 includes a crank sprocket covering portion 11 that covers the crank sprocket 19 and an extension portion 12 that extends rearward from the crank sprocket covering portion 11 and covers the upper side of the drive chain 22. The crank sprocket cover 11 is provided with a crank insertion hole 20 so that the crank arm 14 can be cleared when assembled.

  As shown in the enlarged perspective view of FIG. 2B, in the present invention, the lower chain guard 17 is attached to at least a region in the vicinity of the position of the footrest step 23 corresponding to the infant seat 8. In the illustrated example, the lower chain guard 17 is attached to the chain stay 6 so that the front end of the lower chain guard 17 is positioned to the front of the outer periphery of the rear wheel 2 below the footrest step 23 in the infant seat 8. It is. The lower chain guard 17 is attached later so as not to impair the advantages of the pistol-type chain case 10 that is lightweight, looks good, and has excellent maintainability. In some cases, the lower chain guard 17 is attached to the pistol-type chain. It can also be attached to the lower edge of the extension 12 in the case 10 via an appropriate connector or directly by an attachment screw or one-touch method.

  In the example shown in FIG. 2 (B), the lower part of the chain stay 6 is lower than the front mounting piece 6A and the rear mounting piece 6B suspended from the vicinity of the tire outer peripheral surface of the rear wheel 2 and the vicinity of the rear end claw plate 6C. A front mounting portion 17A and a rear mounting portion 17B of the chain guard 17 are mounted with mounting screws 25. The lower chain guard 17 will be described in detail with reference to FIG. 3, as shown in FIG. 3A, in a side view corresponding to the extending form of the drive chain 22 toward the large-diameter crank sprocket 19 positioned in front. A front mounting portion 17A and a rear portion corresponding to the front mounting piece 6A and the rear mounting piece 6B that are suspended from the chain stay 6 are provided in front of and behind the side chain-shaped lower chain guard 17 whose vertical width gradually increases toward the front. The attachment portion 17B is formed in a boss shape in the thickness direction.

  In the illustrated example, a round hole 17D is formed in the front mounting portion 17A, and a long hole 17E is formed in the rear mounting portion 17B, so that the mounting error in the front mounting piece 6A and the rear mounting piece 6B in the chain stay 6 is increased. Is configured to be absorbed. As clearly understood in FIG. 3B, which is a cross-sectional view taken along the line A-A in FIG. 3A, the upper edge of the lower chain guard 17 is folded to the side of the drive chain 22 to be covered. By configuring the bent portion 17C, the lower covering portion of the drive chain 22 is blinded by a line of sight from the upper side, and the bend portion 17C covers the drive chain 22 from the upper portion. Opportunities for infant feet to be involved are further reduced. As can be clearly understood from the perspective view of FIG. 3C, both the front mounting portion 17A and the rear mounting portion 17B are configured to be recessed from the surface of the lower chain guard 17, and through the round hole 17D and the long hole 17E. The head of the mounting screw 25 to be mounted is not exposed from the surface of the lower chain guard 17, thereby eliminating the possibility that the bottom of the infant's trousers may be caught or fall off due to stimulation from the outside of the mounting screw 25.

  FIG. 4 is a side view of the main part of the latter half of the second embodiment of the infant-mounted bicycle according to the present invention. In the present embodiment, the lower chain guard 17 is configured to cover almost all of the exposed portion below the drive chain 22. Therefore, the front mounting piece 6A formed by hanging from the chain stay 6 is disposed in the vicinity of the circumference of the rotation locus of the crank arm 14 on which the pedal 15 is pivotally supported at the tip. This is because the rider's foot for pedaling is located inside the rotation trajectory of the crank arm 14. If the thickness of the lower chain guard 17 in the vehicle width direction is small and does not interfere with the rotation trajectory of the crank arm 14 in the vehicle width direction, the lower chain guard 17 is extended to the crank sprocket covering portion 11 of the pistol type chain stay 10 and the drive chain 22 It can also be configured to cover all of the exposed lower portion. Thus, even if the infant's foot sitting on the infant seat rides on the chain stay, the infant's foot drive chain is widely used even if it moves greatly from the footrest step and falls off the foot. It will be possible to prevent entrainment.

  The infant-mounted bicycle to which the lower chain guard 17 configured as described above is attached is preferably configured such that at least the rear wheel has a wheel diameter of 24 inches or less. Thus, since at least the rear wheel has a relatively small wheel diameter, the ground height of the infant seat can be reduced, the infant can easily ride over, and the left and right swing of the infant seat is small and more stable traveling is possible. In addition, the function as an infant-mounted bicycle can be dramatically improved. Needless to say, the wheel diameter of the front wheel can be made small as well as the rear wheel.

  The embodiment of the present invention has been described above. However, within the scope of the present invention, the shape of the rear carrier (if it has an infant seat mounting portion, the rear stay and the stay stay portion on the claw plate at the rear end of the chain stay. The shape and shape of the chain stay and the claw plate and rear fork at the rear end of the chain stay and the mounting form to the chain stay (as in the embodiment, the front end of the rear carrier is not necessarily extended to the chain stay. The shape of the infant seat (the foot placement step is preferably configured integrally with the infant seat as in the embodiment, but a separate foot placement step is used for the rear wheel shaft, etc.) The type and its mounting form on the rear carrier (the seat of the infant seat is attached to the horizontal part of the rear carrier and the rear fork In addition, the child seat may be installed directly on the body frame at the upper part of the rear wheel without using the rear carrier.), The shape of the drive chain, Type (belt type made of synthetic rubber or the like can be used in addition to steel chain), pistol type chain case shape (preferably a shape covering at least one outer surface of the vehicle body and the upper side of the drive chain), type And the attachment form to the frame and the hanger part (attachment to the frame via the attachment bracket is suitable), etc., can be adopted as appropriate.

  In addition, the shape and type of the bicycle, the shape of the lower chain guard, and the one whose vertical width gradually increases toward the front are suitable, but if the legs are prevented from getting caught in the drive chain, the vertical width increases gradually. As for the shape that bends the upper edge to the drive chain side, a bent portion such as an arcuate curve is also adopted in addition to a straight bent portion.), Type and its chain Attaching to a stay or pistol type chain case (as in the embodiment, it can be attached via an attachment piece suspended from the chain stay, or via a tightening belt-like attachment member wound around the chain stay. Alternatively, the upper edge of the lower chain guard may be directly attached to the chain stay or pistol type chain case via a clip or the like with one touch. And an arrangement region thereof (can be appropriately adopted from a region in the vicinity of the footrest step position corresponding to the child seat to a region covering almost all of the exposed portion below the drive chain), a foot corresponding to the child seat The shape of the loading step (can be used as appropriate, such as a tread plate, a bar, etc.), type and location (to be formed integrally in the lower front of the infant seat, supported by the rear wheel axle, or attached to the chain stay The wheel diameter may be 24 inches or less. In addition to the rear wheel on which the infant seat is mounted, the front wheel side may be configured to have a wheel diameter of 24 inches or less. About these structures etc., it can select suitably. In addition, the specifications described in the examples are merely examples in all respects and should not be interpreted in a limited manner.

  The infant-mounted bicycle of the present invention is preferably applied to a normal bicycle, but can also be applied to an electrically assisted bicycle in which an infant seat is mounted and auxiliary power is obtained by the driving force of an electric motor. Furthermore, the present invention can be applied not only to bicycles but also to motorcycles equipped with infant seats, or front two-wheel or rear two-wheel adult tricycles in which the drive chain is exposed on the side.

1 Saddle 2 Rear Wheel 3 Main Pipe 4 Seat Pipe 5 Rear Hawk 6 Chain Stay 7 Rear Carrier 8 Infant Seat 9 Infant Handle 10 Pistol Chain Case 11 Crank Sprocket Cover 12 Extension 13 Crankshaft 14 Crank Arm 15 Pedal 16 Rear Wheel Shaft 17 Lower chain guard 19 Crank sprocket 20 Crank insertion hole 21 Rear sprocket 22 Drive chain 23 Foot rest step

Claims (5)

An infant-mounted bicycle having a pistol-type chain case that has an infant seat installed on an upper portion of a rear wheel and covers an upper side of a drive chain stretched between a crank sprocket and a rear sprocket. infant loaded bicycle lower chain guard for covering the lower side, in the form as it is installed vertically from the chain stay at its ends near to being attached along the chain stay. 2. The infant-mounted bicycle according to claim 1, wherein the lower chain guard is attached to at least a region in the vicinity of a footrest step position corresponding to the infant seat. 2. The infant-mounted bicycle according to claim 1, wherein the lower chain guard is configured to cover substantially all of the exposed portion of the lower side of the drive chain. The infant-mounted bicycle according to any one of claims 1 to 3, wherein a wheel diameter of at least a rear wheel of the bicycle to which the lower chain guard is attached is 24 inches or less. The infant-mounted bicycle according to any one of claims 1 to 4, wherein an upper edge of the lower chain guard is bent toward the drive chain.

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