FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
1. Title of the invention: FRAMES OF BICYCLES
2. Applicant(s)
NAME NATIONALITY ADDRESS
ALPHAVECTOR INDIA PVT. LTD. Indian 3rd Floor, Swastik Super Market Ashram Road, Ahmedabad, Gujarat-380009, India
3. Preamble to the description
COMPLETE SPECIFICATION
The following specification particularly describes the invention and the manner in which it
is to be performed.

TECHNICAL FIELD
[0001] The present subject matter relates, in general, to bicycles and, in
particular but not exclusively, to a frame of a bicycle.
BACKGROUND
[0002] Bicycles come in a variety of shapes and sizes and are designed and
used for a variety of purposes. Main structure of a bicycle includes a frame, a front wheel, a rear wheel, and a drivetrain system. Varied components may be affixed to the frame to complete the bicycle. Further, the drivetrain system may include manual pedaling of the bicycle or in case of electric bicycles, a battery powered drivetrain.
BRIEF DESCRIPTION OF DRAWINGS
[0003] The following detailed description references the drawings,
wherein:
[0004] FIG. 1A depicts an existing electric bicycle with a battery pack
concealed within a frame of the existing electric bicycle;
[0005] FIG. 1B depicts an existing electric bicycle having a battery pack
mounted outside a frame of the electric bicycle;
[0006] FIG. 2 illustrates a perspective view of an electric bicycle,
according to an example implementation of the present subject matter;
[0007] FIG. 3 illustrates an exploded view of a frame of an electric bicycle,
according to an example implementation of the present subject matter;
[0008] FIG. 4 illustrates a side sectional view of an electric bicycle,
according to an example implementation of the present subject matter;
[0009] FIG. 5 illustrates a side view of an electric bicycle, according to an
example implementation of the present subject matter;

[0010] FIGS. 6A and 6B illustrate perspective view of an electric bicycle,
according to an example implementation of the present subject matter;
[0011] FIG. 7 illustrates a side sectional view of an electric bicycle,
according to another example implementation of the present subject matter;
[0012] FIG. 8A illustrates a sectional view of a protective member
according to an example implementation of the present subject matter;
[0013] FIG. 8B illustrates a side view of an electric bicycle, according to an
example implementation of the present subject matter; and
[0014] FIG. 8C illustrates a sectional view of an electric bicycle, according
to an example implementation of the present subject matter.
DETAILED DESCRIPTION
[0015] An electric bicycle typically includes a hub motor mounted on a rear
wheel of the electric, a battery pack, a controller to power a motor, and a throttle to control a speed as a user input. Generally, the battery pack may be permanently fixed to the bicycle or may be removably attached to the electric bicycle. In case of the permanently fixed battery pack, the battery pack may be detached from the bicycle only for maintenance. On the other hand, the removable battery pack may be easily removed for replacement or charging even by a rider of the electric bicycle.
[0016] Moreover, the battery pack may either be concealed and placed
inside a frame of the electric bicycle or may be mounted on the frame from outside. FIG. 1A depicts an existing electric bicycle 100A with a battery pack concealed within a frame 102A of the existing electric bicycle 100A. The battery pack may be placed inside a downtube 104A of the frame 102A of the electric bicycle 100A. The battery pack may thus be removed from a bottom portion 106A of the downtube 104A or by removing a side panel 108A of the downtube 104A. Removing the battery pack from the bottom portion 106A of the downtube 104A is inconvenient for a user as the electric bicycle 100A needs to be inverted for removing the battery

pack. Additionally, while removing the battery pack, the user needs to manually disconnect various connectors coming from the battery pack. Therefore, removal of the battery pack is not recommended for users and generally allowed only for service and maintenance engineers. This makes charging of the electric bicycles a challenge as the user has to carry the electric bicycle to a charging point.
[0017] Referring to FIG. 1B, an existing electric bicycle 100B having a
battery pack 102B mounted outside a frame 104B of the electric bicycle 100B is depicted. Battery packs mounted on the frame 104B allow easy handling of the battery pack 102B by a rider. For example, the battery pack 102B may be easily removed by the rider, taken to a charging point and may be connected back to the electric bicycle 100B after charging. However, in such case, the battery pack 102B and corresponding connections are exposed to water and dust during rides. Moreover, an external battery pack, such as the battery pack 102B may be mounted on a downtube 106B which is generally used for mounting a bottle holder (not shown). Alternatively, the battery pack 102B may be mounted behind a seat tube 108B of the electric bicycle 100B. However, mounting the battery pack 102B behind the seat tube 108B may increase an overall length of the electric bicycle 100B. Thus, the battery pack 102B may affect other functionalities of the electric bicycle 100B. In addition, the battery pack 102B may pose a risk of theft.
[0018] The present subject matter describes various implementations of a
frame of a bicycle, specifically, an electric bicycle. The frame ensures that the battery pack is concealed at the same time easily accessible by a user or rider of the electric bicycle.
[0019] The present subject matter discloses a frame of a bicycle. The frame
includes a head tube to support a handlebar of the bicycle. The frame further includes a top tube having a first end and a second end. In addition, the frame includes a seat tube having a top portion and a bottom portion. The top portion of the seat tube is connected with the first end of the top tube. The frame also includes a down tube having a first end and a second end opposite the first end. The first end

of the down tube is connected with the second end of the top tube and the second end of the down tube is connected with the bottom portion of the seat tube.
[0020] The down tube includes a cavity to removably hold a battery pack.
In an example, the cavity is accessible through an opening provided at the first end of the downtube. Further, the frame includes a connecting member to connect the head tube with the first end of the down tube. In an example, the connecting member is in the form of an inverted U-bracket to define a hollow space therewithin.
[0021] Accordingly, the present subject matter describes an electric bicycle
with a battery pack that is concealed during rides inside a downtube of the electric bicycle to be easily removed from a top by a user or rider. The user may remove the battery pack and carry the same to a charging point for charging instead of carrying the entire electric bicycle. In addition, during the ride, the battery pack remains completely concealed in the downtube thus protecting the battery pack from dust and water.
[0022] The present subject matter is further described with reference to the
accompanying figures. Wherever possible, the same reference numerals are used in the figures and the following description to refer to the same or similar parts. It should be noted that the description and figures merely illustrate principles of the present subject matter. It is thus understood that various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0023] FIG. 2 illustrates a perspective view of an electric bicycle 200
(hereinafter referred to as “bicycle 200”), according to an example implementation of the present subject matter. The bicycle 200 includes a frame on which different components may be affixed. The frame includes a head tube 202, a top tube 204, a seat tube 206, and a down tube 208. The head tube 202 is to support a handlebar 210 of the bicycle 200. Further, the top tube 204 includes a first end 212 and a

second end (not shown). The first end 212 of the top tube 204 is connected to a top portion 214 of the seat tube 206. Further, the second end of the top tube 204 is connected to a first end (not shown) of the down tube 208. In addition, a second end 216 of the down tube 208 is connected with a bottom portion 218 of the seat tube 206. As can be seen from FIG. 2, the second end 216 of the down tube 208 is opposite to the first end of the down tube 208.
[0024] In an example implementation, the down tube 208 includes a cavity
(not shown) to removably hold a battery pack (not shown). In an example, the battery pack may include Lithium-ion (Li-ion) batteries or lead acid batteries. Examples of Li-ion batteries may include, but are not limited to, Nickel Manganese Cobalt (NMC) batteries, Lithium Cobalt Oxide (LCO) batteries, and Lithium Iron Phosphate (LFP) batteries. The cavity may be accessible through an opening (not shown) provided at the first end of the down tube 208. It will be evident to a person skilled in the art that the battery pack is not limited to the down tube 208 but may be built in another tube constituting the frame, such as the top tube 204 and the seat tube 206, from where the battery pack may be easily removed.
[0025] The frame of the bicycle 200 further includes a connecting member
(not shown) to connect the head tube 202 with the first end of the down tube 208. In other words, the connecting member connects the head tube 202 with the top tube 204 of the frame. The frame also includes a protective member 220 to cover the head tube 202, the connecting member, and the opening of the down tube 208. The protective member 220 extends along a length of the down tube 208. In an example, the protective member 220 is made of a plastic material, steel, aluminum, or a fibre-reinforced polymer (FRP). The protective member 220 is fastened to the frame through fastening mechanism, such as bolts. The protective member 220 is designed in a manner to conceal the bolts.
[0026] In an example, the protective member 220 may completely
encapsulate the head tube 202, the connecting member, and the opening of the down tube 208 to form a compact, integral member. Thus, the protective member 220

provides a simple, cost effective, and waterproof enclosure to protect the various components of the bicycle 200.
[0027] In an example implementation, the battery pack includes a locking
member 222 to secure the battery pack within the cavity of the down tube 208. The locking member 222 acts as a mechanical lock as well as an electronic lock. The mechanical lock facilitates in holding the battery pack on to the frame, thus protecting the battery pack against theft. Further, as the electronic lock the locking member 222 acts as a switch that can be turned ON or OFF depending on a position of the locking member 222. In an example, the locking member 222 connects the frame with electrical connections of the battery pack. For example, the electrical connections include connections with a charging port for the battery pack, connections with the switch, connections with a blade connector, and connections with onboard electronics, such as, a motor, a controller, a throttle, a brake sensor, and a display.
[0028] During lock-unlock operation, a key may be inserted in the locking
member 222 to rotate the locking member 222 in a first position, for example, in an extreme left position. In the first position of the locking member 222, the electrical connections of the battery pack may attain an OFF position and a mechanical lock cylinder is retracted to an unlock position. Thus, the battery pack is electronically disconnected from the bicycle 200 and is mechanically free. In this position of the locking member 222, the user may remove the battery pack out of the bicycle 200.
[0029] A second position of the locking member 222 may be achieved by
rotating the key in a clockwise direction. In the second position of the locking member 222, the electrical connections of the battery pack remain in the OFF position while the mechanical lock cylinder is extended and engaged in the cavity provided on the frame of the bicycle 200. Thus, the battery pack is firmly locked with the frame mechanically, at the same time the battery pack is electronically disconnected with the components on the bicycle 200. In the second position of the locking member 222, the key may be removed. In an example, the user may use the

second position of the locking member 222 while parking the bicycle 200 in a public place or while using the bicycle 200 without any motor assistance.
[0030] In addition, a third position of the locking member 222 may be
achieved by further rotating the key in the clockwise direction. In the third position of the locking member 222, the electrical connections may attain an ON position and the mechanical lock cylinder is extended. Thus, the battery pack is firmly held on to the frame and also supplies power to the onboard electronics. The user may use this mode while riding the bicycle 200 by using the power of the motor mounted on to a rear wheel 224. Further, the key cannot be removed from the locking member 222 in the third position.
[0031] In an example implementation, the locking member 222 is mounted
on the battery pack along with one part of the blade connector. The locking member 222 acts like an ON-OFF switch between the battery pack and the onboard electronics as described above. In an example, the onboard electronics components along with the second part of the blade connector are mounted on to the frame. When the battery is inserted in the bicycle frame, the two components of the blade connector engage to complete the circuit. The onboard electronics can then be powered by the battery pack by turning ON the locking member 222 switch as described above.
[0032] FIG. 3 illustrates an exploded view of a frame 300 of an electric
bicycle, according to an example implementation of the present subject matter. The frame 300 includes a head tube 302 to support a handlebar (not shown) of the electric bicycle. In an implementation, the frame 300 includes a headlight 304 that may be integrally connected to the head tube 302. In an example, the headlight 304 may include Light Emitting Diodes (LED) bulbs and may be waterproof. In another example, the headlight 304 may be a 12-Watt light. The headlight 304 may be controlled by a switch (not shown) that may be provided on the handlebar or on the light itself.

[0033] Further, the frame 300 includes a top tube 306 having a first end 308
and a second end 310. The frame 300 also includes a seat tube 312 having a top portion 314 and a bottom portion 316. The top portion 314 of the seat tube 312 is connected with the first end 308 of the top tube 306. In addition, the frame 300 includes a down tube 318 having a first end 320 and a second end 322 opposite the first end 320. As clearly depicted in FIG. 3, the first end 320 of the down tube 318 is connected with the second end 310 of the top tube 306. Further, the second end 322 of the down tube 318 is connected with the bottom portion 316 of the seat tube 312. The down tube 318 includes a cavity (not shown) to removably hold a battery pack 324. The cavity may be accessed through an opening 326 provided at the first end 320 of the down tube 318.
[0034] The frame 300 further includes a connecting member 328 to connect
the head tube 302 with the first end 320 of the down tube 318. In other words, the connecting member 328 connects the head tube 302 with the top tube 306 of the frame 300.
[0035] The frame 300 also includes a protective member 330 to cover the
head tube 302, the opening 326 of the down tube 318, and the connecting member 328. In an example, the protective member 330 may be fabricated as a unibody or may be formed in different parts. In scenarios where the protective member 330 is a unibody structure, the headlight 304 is integrated within the protective member 330. FIG. 3 depicts the protective member 330 to include a first section 330A and a second section 330B. To assemble the protective member 330, the first section 330A and the second section 330B may be joined together, such as by snap fit mechanism, or any other fastening means. The protective member 330 extends along a length of the down tube 318 to cover any cables or fasteners associated with the down tube 318. In an example, the protective member 330 has provision for allowing entry of cables from a top region and allowing exit of the cables from a bottom region. In an example, the protective member 330 is made of a plastic material, steel, aluminum, or a fibre-reinforced polymer (FRP). The protective

member 330 is fastened to the frame 300 through fastening mechanism, such as bolts, and is designed in a manner to conceal the bolts.
[0036] In an example implementation, the protective member 330 may
cover the headlight 304, thereby protecting the headlight 304 from any damage. Further, all joints between the protective member 330 and the frame 300 are covered with rubber seals to prevent any dust or water ingress and to reduce any vibrations.
[0037] In addition, the frame 300 includes a locking member 332 to secure
the battery pack 324 within the cavity of the down tube 318. In an example, the locking member 332 is provided on a top portion of the battery pack 324. In another example, the locking member 332 may be provided at a side portion of the battery pack 324. In an example, the locking member 332 provides both mechanical and electronic locking functionalities. As the mechanical lock, the locking member 322 may hold the battery pack 324 to the frame 300. As the electronic lock, the locking member 322 may act as a main switch for the battery pack 324. Both the mechanical and electronic locking functionalities may be operated using a single key.
[0038] FIG. 4 illustrates a side sectional view of an electric bicycle 400,
according to an example implementation of the present subject matter. As described with reference to FIGS. 2 and 3, the electric bicycle 400 includes a head tube 402, a top tube 404, a seat tube 406, a down tube 408, a connecting member 410, and a protective member 412. As is depicted in FIG. 4, the down tube 408 includes a cavity 414 for holding a battery pack 416. In an example, the cavity 414 may include a specific compartment for the battery pack 416, which is isolated from other areas to prevent any water and dust ingress and prevent any accidents. Examples of the battery pack 416 may include, but are not limited to, a Lithium-ion battery pack, a Lithium polymer battery pack, a Nickel metal hydride battery pack, a Lead-acid battery pack, and an ultracapacitor battery pack. The cavity 414 may be accessed from a top portion or a first end of the down tube 408.
[0039] In an example, the down tube 408 includes an opening to receive the
battery pack 416. The opening may be formed to correspond to a shape and

dimensions of the battery pack 416. Further, the battery pack 416 may be provided with a handle 418 for pulling the battery pack 416 out of the cavity 414. In an example, the handle 418 may be extending outwards from the battery pack 416 and may be accessible from the top portion of the electric bicycle 400. For instance, the handle 418 may be pivotably coupled to the battery pack 416, such as by means of hinges. When the battery pack 416 is inserted within the cavity 414, the handle 418 may be pulled down to fit within a slot (not shown) provided within the protective member 412. To remove the battery pack 416 from the down tube 408, a rider of the electric bicycle 400 may simply pull out the battery pack 416 by using the handle 418.
[0040] The protective member 412 may cover a top region of the battery
pack 416, a headlight, a controller, wires and cables, and a connector for connecting the battery pack 416 with the controller. Further, the protective member 412 includes an extended cover to conceal all cables and wires along the down tube 408.
[0041] FIG. 5 illustrates a side view of an electric bicycle 500, according to
an example implementation of the present subject matter. The electric bicycle 500 includes a frame on which different components may be affixed. The frame includes a head tube 502, a top tube 504, a seat tube 506, a down tube 508, and a protective member 510. In an example, the electric bicycle 500 is similar to the electric bicycle 200. Therefore, different components of the frame of the electric bicycle 500 are not described here in detail for the sake of brevity.
[0042] The frame of the electric bicycle 500 also includes a headlight 512
integrally connected to the head tube 502. In an example, the protective member 510 covers the headlight 512, thereby protecting the headlight 512 from any damage. In an example implementation, the frame includes a back tube 514 extending away from the seat tube 506 towards a rear wheel 516 of the electric bicycle 500. The back tube 514 includes a taillight 518 integrally coupled to the back tube 514.

[0043] In an example, the headlight 512 and the taillight 518 may produce
both spot and flood lighting. In an example, the headlight 512 and the taillight 518 may be waterproof. In another example, the headlight 512 and the taillight 518 may have same power or may be of different power. Further, the headlight 512 and the taillight 518 may be controlled by a switch (not shown) that may be provided on the handlebar or on the light itself.
[0044] In an example, the headlight 512 and the taillight 518 may include,
but are not limited to, an LED light, an incandescent light, a Halogen light, a Krypton light, and a Xenon light.
[0045] FIGS. 6A and 6B illustrate perspective views of an electric bicycle
600, according to an example implementation of the present subject matter. FIG. 6A depicts the electric bicycle 600 having a head tube 602, a top tube 604, a down tube 606, and a connecting member 608. The connecting member 608 connects the head tube 602 with the down tube 606. The electric bicycle 600 also includes a headlight 610 that may be integrally attached to a front surface of the head tube 602. The headlight 610 may be operated by a switch 612 provided on a handlebar 614 of the electric bicycle 600. In an example, the connecting member 608 is in the form of an inverted U-bracket to define a hollow space 616 therewithin. The hollow space 616 defines a room for housing a controller (not shown) of the electric bicycle 600. The controller may be configured to control various functions associated with the electric bicycle 600.
[0046] Referring to FIG. 6B, the electric bicycle 600 includes a protective
member 618 to form a casing over the head tube 602, the connecting member 608, and the down tube 606. In an example, the protective member 618 is made of a plastic material, steel, aluminum, or a fibre-reinforced polymer (FRP). The protective member 618 may also include a compartment (not shown) for being fitted in the hollow space 616 of the inverted U-bracket. The compartment may be employed for housing the controller of the electric bicycle 600.

[0047] To hold the compartment carrying the controller, the protective
member 618 includes a plate 620 for securing the compartment inside the hollow space 616 of the inverted U-bracket. To access the compartment, a user may have to remove the plate 620 from a bottom surface of the connecting member 608. Thus, the protective member 618 provides hassle-free connections and assembly of the electric bicycle 600.
[0048] FIG. 7 illustrates a side sectional view of a frame 700 of an electric
bicycle (not shown), according to an example implementation of the present subject matter. The frame 700 is similar to the frame 300, as described above. The frame 700 includes a head tube 702, a top tube 704, a seat tube 706, a down tube 708, a connecting member 710, a protective member 712. In an example, the down tube 708 includes a cavity 714 to receive a battery pack 716. As depicted in FIG. 7, the cavity 714 is accessible through an opening 718 provided at a top portion or a first end 720 of the down tube 708. Further, the battery pack 716 may be provided with a handle 722 for pulling the battery pack 716 out of the cavity 714.
[0049] In an example, the cavity 714 of the down tube 708 includes one or
more electrical connectors 724 to automatically connect with corresponding electrical connectors 726 of the battery pack 716 when the battery pack 716 is inserted in the cavity 714. Such a connection eliminates any need for manually removing connections associated with the battery pack 716. For example, male connectors (plugs) may be provided inside the cavity 714 and the corresponding female connectors (jacks) are provided on the battery pack 716. The male-female connectors automatically connect when the battery pack 716 is completely inserted in the down tube 708. Such design eliminates any need for the user to manually disconnect or connect any connections thus making removal of the battery pack 716 and replacement an easy process.
[0050] In an example, the battery pack 716 is provided with a charging pin
728 which is exposed even when the battery pack 716 is mounted inside the frame 700. The charging pin 728 allows the user to charge the battery pack 716 even when

the battery pack 716 is mounted within the electric bicycle as well as when the battery pack 716 is removed from the electric bicycle. In an example, the charging pin 728 for the battery pack 716 is provided in the top cap of the battery pack 716. Further, the protective member 712 is designed in a manner such that the charging pin 728 is exposed at all times, for easy charging. In an example implementation, the protective member 712 includes an aperture 730 near the opening 718 of the down tube 708. The aperture 730 ensures that the charging pin 728 is accessible from the aperture 730 for charging the battery pack 716 even when the battery pack 716 is mounted within the frame 700.
[0051] FIG. 8A illustrates a side view of an electric bicycle 800, according
to an example implementation of the present subject matter. The electric bicycle 800 is similar to the electric bicycle 200, 400, 500, 600, or 700. Therefore, all components of the electric bicycle 800 are not described again for sake of brevity. The electric bicycle 800 includes a down tube 802 defining a cavity (not shown) for receiving a battery pack 804. The down tube 802 includes a first end 802a and a second end 802b. In an example implementation, the down tube 802 includes a through slot 806 near the second end 802b. Further, the battery pack 804 includes a projection 808, such as a tapered projection, extending from the battery pack 804.
[0052] FIG. 8B illustrates a sectional view of a protective member 810
according to an example implementation of the present subject matter. The protective member 810 is similar to the protective member described above in various implementations of the present subject matter. As depicted in FIG. 8B, the protective member 810 includes a protruding member 812 extending perpendicular to an inner surface 814 of the protective member 810. In an example implementation, the protruding member 812 includes a slot 816 for receiving the projection 808 of the battery pack 804.
[0053] Referring to FIG. 8C, a sectional view of the electric bicycle 800 is
illustrated, according to an example implementation of the present subject matter. As may be clearly seen in FIG. 8C, in an assembled state, when the protective

member 810 is placed over the down tube 802, the protruding member 812 passes through the slot 806 of the down tube 802 such that the protruding member 812 goes across the down tube 802. In an example, the slot 816 in the protruding member 812 has a tapered profile to correspond with a profile of the projection 808 of the battery pack 804.
[0054] Therefore, when the battery pack 804 is inserted in the down tube
802, the projection 808 on the battery pack 804 fits into the slot 816 on the protruding member 812 of the protective member 810. This ensures that the battery pack 804 is aligned from both the ends in the down tube 802 and does not vibrate or move during when the electric bicycle 800 is being used for rides. In absence of such an arrangement, the battery pack 804 may keep moving inside the down tube 802 and create rattling noise during the rides, which may also damage the battery pack 804.
[0055] Although the present subject matter has been described with
reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternate embodiments of the subject matter, will become apparent to persons skilled in the art upon reference to the description of the subject matter.

We Claim:
1. A frame (300, 700) of a bicycle (200, 400, 500, 600), the frame (300, 700) comprising:
a head tube (202, 302, 402, 502, 602, 702) to support a handlebar (210, 614) of the bicycle (200, 400, 500, 600);
a top tube (204, 306, 404, 504, 604, 704) having a first end (212, 308) and a second end (310);
a seat tube (206, 312, 406, 506, 706) having a top portion (214, 314) and a bottom portion (218, 316), wherein the top portion (214, 314) of the seat tube (206, 312, 406, 506, 706) is connected with the first end (212, 308) of the top tube (204, 306, 404, 504, 604, 704);
a down tube (208, 318, 408, 508, 606, 708, 802) having a first end (320, 720, 802a) and a second end (216, 322, 802b) opposite the first end (320, 720, 802a), the first end (320, 720, 802a) of the down tube (208, 318, 408, 508, 606, 708, 802) is connected with the second end (310) of the top tube (204, 306, 404, 504, 604, 704) and the second end (216, 322) of the down tube (208, 318, 408, 508, 606, 708, 802) is connected with the bottom portion (218, 316) of the seat tube (206, 312, 406, 506, 706), wherein the down tube (208, 318, 408, 508, 606, 708, 802) includes a cavity (414, 714) to removably hold a battery pack (324, 416, 716, 804), the cavity (414, 714) being accessible through an opening (326, 718) provided at the first end (320, 720, 802a);
a connecting member (328, 410, 608, 710) to connect the head tube (202, 302, 402, 502, 602, 702) with the first end (320, 720) of the down tube (208, 318, 408, 508, 606, 708, 802); and
a protective member (220, 330, 412, 510, 618, 712, 810) to cover the head tube (202, 302, 402, 502, 602, 702), the connecting member (328, 410, 608, 710), and the opening (326, 718) of the down tube (208, 318, 408, 508, 606, 708, 802), wherein the protective member (220, 330, 412, 510, 618, 712, 810) extends along a length of the down tube (208, 318, 408, 508, 606, 708, 802).

2. The frame (300, 700) as claimed in claim 1, wherein the connecting member
(328, 410, 608, 710) is in a form of an inverted U-bracket to define a hollow space
(616) therewithin.
3. The frame (300, 700) as claimed in claim 2, wherein the protective member (220,
330, 412, 510, 618, 712, 810) includes a compartment for being fitted in the hollow
space (616) of the inverted U-bracket, the compartment being accessible from a
bottom of the connecting member (328, 410, 608, 710).
4. The frame (300, 700) as claimed in claim 1, wherein the frame (300, 700)
includes a headlight (512, 610) integrally connected to the head tube (202, 302, 402,
502, 602, 702).
5. The frame (300, 700) as claimed in claim 4, wherein the protective member (220, 330, 412, 510, 618, 712, 810) is to cover the headlight (512, 610).
6. The frame (300, 700) as claimed in claim 1, wherein the cavity (414, 714) of the down tube (208, 318, 408, 508, 606, 708, 802) includes at least one connector (724) to automatically connect with corresponding at least one connector (726) of the battery pack (324, 416, 716, 804) when the battery pack (324, 416, 716, 804) is inserted in the cavity (414, 714).

7. The frame (300, 700) as claimed in claim 1, wherein the frame (300, 700) includes a back tube (514) extending away from the seat tube (206, 312, 406, 506, 706) towards a rear wheel (224, 516) of the bicycle (200, 400, 500, 600, 800).
8. The frame (300, 700) as claimed in claim 7, wherein the frame (300, 700) includes a taillight (518) integrally coupled to the back tube (514).
9. The frame (300, 700) as claimed in claim 1, wherein the protective member (220,
330, 412, 510, 618, 712, 810) is made of one of a plastic material, steel, aluminum,
and a fibre-reinforced polymer (FRP) and is fastened to the frame through bolts.
10. The frame (300, 700) as claimed in claim 9, wherein the protective member
(220, 330, 412, 510, 618, 712, 810) is designed to cover the bolts.

11. The frame (300, 700) as claimed in claim 1, wherein the protective member (220, 330, 412, 510, 618, 712, 810) includes an aperture (730) near the opening (326, 718) of the down tube (208, 318, 408, 508, 606, 708, 802) such that a charging pin (728) of the battery pack (324, 416, 716, 804) is accessible from the aperture (730).