JP3133119U - Bicycle and transmission crank - Google Patents

Abstract

Provided are a labor-saving bicycle and its transmission crank that transmit a large force to a gear drive panel to exert a large driving force even when a pedal is in the vicinity of the top dead center, and are excellent in strength and aesthetics.
A bicycle includes a frame, a pair of wheels, a gear drive panel, a handle, a saddle, and a pair of pedals, and a pair is provided between the pair of pedals and the gear drive panel. The transmission crank 11 is provided. The pair of transmission cranks 11 has a first end and a second end. The first end of the pair of transmission cranks 11 is pivotally attached to the transmission shaft center 3 of the gear drive panel 2, and the second end is pivotally attached to the pair of pedals 4. The pair of transmission cranks 11 are bent at an angle from the radial direction of the inner and outer diameters to the first end of the gear drive panel 2 to the second end to be pivotally attached to the pair of pedals 4. The inner diameter angle that is stretched and bent and formed is smaller than the outer diameter angle.
[Selection] Figure 1

Description

  The present invention relates to a bicycle and its transmission crank, and more particularly to a labor-saving bicycle and its transmission crank that facilitate driving of a user (rider).

  Bicycles have been widely used for many years as a means of transportation (or transportation) due to their lightness and economy, and have continued to be active as one convenient means of transportation even today. A bicycle is a mechanism in which a user (rider or rider) applies a force to a pedal by stepping and rotates a bicycle wheel by a chain to advance the bicycle efficiently. Bicycles are often used not only as a means of transportation for daily life but also for leisure (entertainment), exercise or fitness, and are one of the indispensable tools (tools) for such purposes. In addition, life and environment are changing as science and technology progress, but environmentally friendly bicycles bring enjoyment (comfort) and convenience to daily life.

  A side view of a specific example of a conventional general bicycle is shown in FIGS. FIG. 4 is an overall side view of a conventional general bicycle, and FIG. 5 is an enlarged view of the crank and pedal portions. A conventional bicycle includes a crank 1, a gear drive panel 2, a transmission shaft center (rotary shaft) 3, a pedal 4, a drive gear 5, a frame 6, wheels (front and rear) 7, a handle 8, a saddle (seat) 9, and the like. ing.

  In a conventional bicycle, the crank 1 adopts a linear design. When one end of the crank 1 is pivotally connected to the transmission shaft center 3 of the gear drive panel 2 to drive the bicycle wheel 7, when the pedal 4 is depressed to perform a circumferential stepping motion, the crank 1 is interposed. The transmission shaft 3 is rotated, the power is transmitted to the front drive gear 5, and the bicycle wheel 7 is driven through the chain.

  The conventional method of rotating the front drive gear 5 through the transmission shaft 3 using the power from the conventional crank 1 as described above utilizes the “principle principle” that requires force. When the pedal 4 passes the top dead center (the highest position of the pedal) when the bicycle is driven and the foot is stepped on the circumference, the force point of the pedal 4 is such that the crank 1 and the transmission shaft 3 are both A straight line is formed, and this portion is the maximum output point (arrow symbol F). Since the force F, the crank 1 and the transmission shaft center 3 form a straight line from top to bottom, the lever moment is equal to 0 when it is at the maximum output point. At this time, the force of the thigh part of the human body (bicycle rider) reaches the maximum, but the machine efficiency becomes the lowest output. This is the position where the maximum output at the moment of output of the thigh part of the human body, that is, the position where the most force is applied, when the bicycle is driven to perform a stepping motion in a circumferential shape. In addition, the thigh part needs to continuously step on the bicycle and drive the bicycle, and the thigh part reaches the top dead center of the maximum amount of instantaneous output by performing the stepping movement of the thigh part. The muscles of the club are easily tired. Therefore, the conventional bicycle transmission system design as described above is likely to cause a waste of mechanical power, and the output of the thigh part is different, and the output is uneven and the rider tends to get tired. It gets relatively worse.

  In order to solve the above-mentioned problems, a utility model registration application No. 94202795 in the Republic of China is attached to a bicycle with a pair of transmission cranks mainly including a transmission crank having a first end and a second end. Thus, a bicycle is disclosed that saves power when a user (rider) steps on the pedal of the bicycle. The radial direction of the inner diameter and outer diameter of the first end portion of the transmission crank disclosed in this utility model is bent outward to form a bent portion by extending an angle to the second end portion. The effective moment arm provided improves the design of conventional bicycle forces against the moment at which the transmission axis of the bicycle is generated.

  However, the conventional bicycle and its transmission crank have problems to be improved in terms of transmission efficiency for transmitting the leg force applied by the rider to the pedal to the gear drive panel, strength of the transmission crank, and aesthetics.

  The present invention has been made in view of the above-described problems of the prior art, and eliminates or reduces such problems, that is, more efficiently uses the rider's power to save labor and is excellent in strength and aesthetics. An object is to provide a bicycle and its transmission crank.

  The bicycle according to the present invention and its transmission crank employ the following characteristic configuration.

  (1) In a bicycle having a frame, a pair of wheels, a gear drive panel, a handle, a saddle, and a pair of pedals, a pair of transmission cranks is provided between the pair of pedals and the gear drive panel. The transmission crank has a first end and a second end, the first end is pivotally attached to the transmission shaft center portion of the gear drive panel, the second end is pivotally attached to a pair of pedals, and 1 The pair of transmission cranks is bent outward from the inner diameter of the first end and the outer diameter of the first end pivotally attached to the gear drive panel, and is extended at an angle pivoted to the second end of the pair of pedals; The stretched inner diameter angle is smaller than the outer diameter angle.

  (2) Each transmission crank of the pair of transmission cranks is characterized in that at least one hole is formed at a predetermined position between the first end and the second end (1). Bicycles.

  (3) The bicycle according to (2), wherein a pin is inserted into a hole of each transmission crank of the pair of transmission cranks and is fastened and fixed to the gear drive panel.

  (4) The bicycle according to (1), (2), or (3), wherein each transmission crank of the pair of transmission cranks is formed in a substantially bent sector shape.

  (5) In a bicycle having a pair of pedals attached to a pair of left and right transmission cranks fixed to the gear drive panel for rotationally driving the wheels by a chain disposed below the saddle, each of the pair of transmission cranks The transmission crank is formed by a wide plate-like member having a substantially “h” shape, and an opening formed at one end of the plate-like member is inserted into the rotation shaft of the gear drive panel, and the transmission crank is disposed in the vicinity of the other end. A pedal is rotatably attached, and a pin is inserted into a hole formed in the vicinity of the bent portion of the plate-like member and a hole formed in the arm of the gear drive panel.

  (6) A transmission crank that is supported by a transmission shaft center of a bicycle gear drive board and transmits a pedal depression force to the gear drive board, and includes a substantially flat plate-like member, a crank body, a first end portion, and a second end portion. The first end is bent at a certain angle from the inner diameter and outer diameter of the first end to the second end, and the angle of the bent inner diameter is smaller than the outer diameter. It is characterized by.

  (7) The transmission crank according to (6), wherein the transmission crank has at least one hole formed at a predetermined position between the first end and the second end.

  (8) The transmission crank according to (7), wherein a pin is inserted into the hole of the transmission crank and is fastened and fixed to the gear drive panel.

  (9) The transmission crank according to (6), (7), or (8), wherein the transmission crank is formed in a fan shape substantially bent from the first end to the second end.

  (10) In a transmission crank that is attached to a gear drive board of a bicycle or the like and rotates the gear drive board by stepping on a pedal, it is a wide plate-like member formed in a substantially “h” shape, and this plate-like member The opening formed at one end of the gear is pivotally attached to the drive shaft center of the gear drive panel, a pedal is attached in the vicinity of the other end, and the pin formed in the hole formed between the one end and the other end and the hole of the gear drive panel It is characterized by being inserted and fixed.

  According to the bicycle of the present invention and its transmission crank, the following practical effects can be obtained. In other words, the transmission crank formed by the bent fan-shaped or wide “H” shaped plate-like member is attached to the gear drive board and the pedal, so that the stepping force applied by the rider to the pedal can be efficiently transmitted to the gear drive board. It is possible to communicate. Further, since the transmission crank is formed by a plate-shaped member having a characteristic shape made of a lightweight metal, alloy, reinforced plastic, or the like, sufficient strength can be obtained, and the possibility of breakage or breakage can be eliminated. Furthermore, it is possible to obtain a new and excellent appearance (aesthetic appearance) by adopting the transmission crank as described above.

  Hereinafter, the configuration and operation of a preferred embodiment of a bicycle and its transmission crank according to the present invention will be described in detail with reference to the accompanying drawings, in particular, FIGS. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention. Further, those skilled in the art can easily understand that various modifications and changes can be made according to a specific application without departing from the gist and spirit of the present invention.

  FIG. 1 is a side view showing an entire bicycle according to a preferred embodiment of the present invention. FIG. 2 is an enlarged view of a portion including the transmission crank and pedal 4 of the bicycle shown in FIG.

  As shown in FIG. 1, the bicycle of the present invention includes a frame 6, a pair of wheels 7 pivoted at the front and rear ends on the lower side of the frame 6, a gear drive panel 2 pivoted near the middle of the frame 6, A handle 8 attached to the upper front end of the frame 6, a saddle 9 attached near the upper middle of the frame 6, a pair of left and right transmission cranks 11, and a pair of left and right pedals 4 attached to one end of each transmission crank 11. It is comprised by.

  Further, as best shown in FIG. 2, each transmission crank 11 has a first end portion 111 and a second end portion 112. An opening is formed in the first end portion 111, and a transmission shaft center (rotating shaft) 3 of the gear drive panel 2 is pivoted in the opening. On the other hand, the pedals 4 are rotatably attached to the second ends 112 of the pair of transmission cranks 11, respectively.

  Furthermore, it demonstrates in detail with reference to FIG. Each transmission crank 11 is a plate-like member formed in a substantially bent sector shape or a wide “h” shape. These transmission cranks 11 are preferably formed of a light metal or alloy such as aluminum or a reinforced plastic material, but an appropriate material can be used depending on the application. The inner diameter and the outer diameter of the first end 111 of the transmission crank 11 are bent outward in the radial direction, and the angle is extended to the second end 112 to form a bent portion 113. As a result, the bent portion 113 is interposed between the first end portion 111 and the second end portion 112. The bent and stretched angles are respectively set such that the inner diameter angle is θ and the outer diameter angle is β. Also, the outer diameter angle β is increased by the inner diameter angle θ, and the bending portion 113 provides the transmission crank 11 with a strengthening function, thereby reinforcing the transmission crank 11 and making it difficult to break. In addition, the bending portion 113 is provided with a hole 12 at a predetermined position, and the transmission crank 11 is fixed on the gear drive panel 2 by inserting and fixing the pin 10 into the hole 12.

  Next, FIG. 3 shows an explanatory diagram in which the force acting on the pedal 4 generates a moment with respect to the gear drive panel (its moment arm) 2. Hereinafter, FIG. 3 will be described with reference to FIG. When the user (bicycle rider) performs a stepping motion on the pedal 4 in a circumferential manner, the force F (shown in the direction of the arrow) generated on the pedal 4 is exerted on the moment arm formed by the transmission shaft 3 and the pin 10. Works. This force F acts on the position of the pin 10 (or the hole 12) by the direction of the acting force (the chain line shown in FIG. 2). At this time, a moment is generated in the transmission shaft 3, and the power output by transmitting the force F of the pedal 4 to the pin 10 is rotated to drive the gear drive panel 2 (or the front drive gear 5) to advance the bicycle. As described above, the method of directly driving and rotating the gear drive panel 2 (or the front drive gear 5) with the power applied to the pin 10 is the principle of labor-saving lever. This method can reduce power loss, avoid fatigue of the user (rider or rider), and improve forward drive efficiency.

  Advantages of the labor-saving bicycle and transmission crank according to the present invention are that the moment arm is effectively increased and greater power is obtained, so that the ride of the bicycle can realize a more labor-saving purpose and the transmission crank 11 is bent. As a sector, the reinforcing effect can be enhanced so that the transmission crank does not break. Furthermore, this transmission crank has a good appearance, and its molding is also beautiful and has various changes, so that the user has more choice or interest.

  The preferred embodiments of the bicycle and its transmission crank according to the present invention have been described above. However, it will be readily understood by those skilled in the art that various modifications or changes can be made in accordance with a specific application without departing from the gist and spirit of the present invention. For example, it is possible to add coloring or a pattern or a design to the outer surface of each transmission crank according to the user's preference. Further, an inner bent portion may be formed on the outer peripheral edge of each transmission crank so as to partially cover the gear drive board without interfering with the gear drive board. Furthermore, it is also possible to provide a plurality of holes 12 formed in the transmission crank, and fix them at different positions of the arm with pins or change the pedal mounting position as necessary.

1 is a side view showing an overall configuration of a preferred embodiment of a bicycle according to the present invention. FIG. 2 is an enlarged view of a part including a transmission crank and a pedal of the bicycle according to the present invention shown in FIG. 1. It is explanatory drawing of the force which acts on the pedal in the bicycle of this invention shown in FIG. 1 producing a moment with respect to a moment arm. It is a side view which shows the whole general bicycle structure. It is an enlarged view of the part containing the crank and pedal of the conventional bicycle shown in FIG.

Explanation of symbols

2 Gear drive panel 3 Transmission shaft center (rotating shaft)
4 pedal 5 drive gear 6 frame 7 wheel 8 handle 9 saddle 10 pin 11 transmission crank 12 hole 111 first end 112 second end 113 bent portion

Claims (10)

In a bicycle having a frame, a pair of wheels, a gear drive panel, a handle, a saddle and a pair of pedals,
A pair of transmission cranks is provided between the pair of pedals and the gear drive panel, the pair of transmission cranks having a first end and a second end, and the first of the pair of transmission cranks. One end is pivotally attached to a transmission shaft center portion of the gear drive panel, the second end of the pair of transmission cranks is pivotally attached to the pair of pedals, and the pair of transmission cranks is The first end portion pivotally attached to the gear drive panel is bent from the radial direction of the first end portion to the second end portion of the pair of pedals, and is extended at an angle that is pivotally attached to the second end portion of the pair of pedals. A bicycle characterized in that the angle of the extended inner diameter is smaller than the angle of the outer diameter.   2. The transmission cranks of the pair of transmission cranks, wherein at least one hole is opened at a predetermined position between the first end portion and the second end portion. Bicycle described in.   The bicycle according to claim 2, wherein a pin is inserted into the hole of each transmission crank of the pair of transmission cranks and is fastened and fixed to the gear drive panel.   4. The bicycle according to claim 1, wherein each transmission crank of the pair of transmission cranks is formed in a substantially bent sector shape. 5. In a bicycle having a pair of pedals attached to a pair of left and right transmission cranks which are disposed below the saddle and which are fixed to a gear drive panel for rotationally driving wheels by a chain,
Each transmission crank of the pair of transmission cranks is formed by a wide, substantially “h” -shaped plate-like member, and an opening formed at one end of the plate-like member is inserted into the rotation shaft of the gear drive panel. The pedal is rotatably attached in the vicinity of the other end, and a pin is inserted into a hole formed in the vicinity of the bent portion of the plate-like member and a hole formed in the arm of the gear drive panel. Bicycle to do. In the transmission crank that is rotatably supported by the transmission shaft center of the gear drive panel of the bicycle and transmits the stepping force of the pedal to the gear drive panel,
It has a crank body of a substantially flat plate-like member, a first end and a second end, and is bent and stretched at an angle from the inner and outer diameters of the first end to the second end in the outward direction. The transmission crank is characterized in that the angle of the bent and extended inner diameter is smaller than the angle of the outer diameter.   The transmission crank according to claim 6, wherein at least one hole is formed in the transmission crank at a predetermined position between the first end and the second end.   The transmission crank according to claim 7, wherein a pin is inserted into the hole of the transmission crank and is fastened and fixed to the gear drive panel.   The transmission crank according to claim 6, 7 or 8, wherein the transmission crank is formed in a fan shape that is substantially bent from the first end to the second end. In a transmission crank that is attached to a gear drive board such as a bicycle and rotates the gear drive board by stepping on a pedal,
It is a wide plate-like member formed in a substantially “h” shape, and an opening formed in one end portion of the plate-like member is pivotally attached to the transmission shaft center of the gear drive panel, and in the vicinity of the other end portion. A transmission crank, wherein the pedal is attached, and a pin is inserted into and fixed to a hole formed between the one end and the other end and a hole of the gear drive panel.

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