JP2001191972A - Coverall chain case for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a chain hooking action and to improve workability at assembling or at recovering a dislocated chain. SOLUTION: This coverall chain case 1 for a bicycle comprises a case body 2 formed to cover the front gear and the rear gear of the bicycle and the whole chain wound on both gears and covering the front from the vicinity of a hub shaft and a rear cover 3 openably connected to the end edge of the rear opening 2D of the case body 2 to cover the rear from the vicinity of the hub shaft. The front gear surface side section 2A and the front end side 2C of the case body 2 are opened to form a chain operation opening section 4, and the opening section 4 is openably closed by a front cover 5 having a hole 6 insertable by at least the crankshaft of the bicycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle full-length (all-case type) chain case made of a synthetic resin or a thin metal plate (sheet metal).

[0002]

2. Description of the Related Art As an entire chain case for a bicycle,
Examples illustrated in FIGS. 9A and 9B are known. This chain case 71 is a front gear 7 of a bicycle 70.
2. Rear gear (free wheel) 73 and both gears 72, 7
A case body 76 formed so as to cover the entire chain 74 wound around the shaft 3 and covering the front from the vicinity of the hub shaft 75; and a hub shaft connected to the rear opening edge 77 of the body 76 so as to be openable and closable. A rear cover 78 is formed so as to cover the rear from near 75, and an eye cover 80 that closes a large area eye hole 79 formed near the front gear of the front body of the case body 76 and the rear gear therefrom (see FIG. See Japanese Utility Model Application Publication No. 56-131277.

The eyeball hole 79 is a hole slightly larger than the outer diameter of the front gear 72, and is a deformed hole extending toward the rear gear 73. The tension hole provided in the lower traveling band of the chain 74 near the front gear 72. Even with wheels, the chain can be easily hooked. The lower part of the rear cover 78 is connected to the case body 76 via a hinge 81 so that the chain 74 can be easily removed from the case 74. A full-length chain case configured to be engageable / disengageable (not shown) is known (see Japanese Utility Model Publication No. 63-3573).

[0004]

By the way, in the above prior art, in the case of the former (Japanese Utility Model Application Laid-Open No. 56-131277),
Although the eye hole 79 of the chain case 71 is enlarged, the eye lid 80 that closes the eye hole 79 engages a notch 79A formed at the edge of the hole of the eye hole 79 with the claw 80A protruding in the periphery thereof. And the front gear 72 can be opened, but the front end side 76A of the case body 76 is closed. Since the work can only be performed from the front side through the eyeball hole 79 and the chain 74 cannot be pulled out from the front end side, it is difficult to hang the chain on the front gear 72.

[0005] In addition, the above-mentioned conventional technique (Japanese Utility Model Publication No. 63-63)
No. 3573), when the bicycle is assembled, the bicycle is in an upside down state while being transported on the assembly line.
8, the hinge 81 is located on the upper side, and even if it is rotated upward to open the rear opening of the case body 76, the rear opening is naturally rotated downward by vibration during conveyance on the assembly line. In order to close, the rear cover 78 must be turned upward again, and there is a problem in that the chain hooking workability is poor. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a full-size bicycle full-chain case that is easy to hang a chain at the time of assembling or repairing a detached chain and has good workability. To be.

[0006]

According to the present invention, the following technical measures are taken to achieve the above object. That is,
The present invention is formed so as to entirely cover the front gear, the rear gear of the bicycle, and the chain wound around both gears, and forms an eyeball hole on the front side of the front gear, and closes this eyeball hole with an eyeball cover. In the configured bicycle full-length chain case, the eye hole has a chain operation opening by opening the front of a front gear, and the eye lid is configured to close the eye hole and the chain operation opening. (Claim 1).

[0007] With this structure, the chain operation opening is open on the front side (eyeball hole) and the front end side following it, so that the chain can be pulled out to the front of the front gear and operated, and the chain hooking operation can be performed. Can be easily and efficiently performed. Moreover, when the chain case is formed of a synthetic resin, the structure of the molding die can be simplified, the moldability can be improved, and the quality can be improved. Further, the chain case according to the present invention is characterized in that the chain operation opening is formed over a half circumference of the gear at the front side of the front gear (claim 2).

[0008] By forming the chain operation opening over half the circumference of the front gear in this way, the chain hooking operation can be performed more easily and quickly in combination with the eyeball hole. Further, in the chain case according to the present invention, the eyeball hole is provided with a support seat for positioning the eyeball lid at a rear side of the front gear at a hole edge (claim 3). With this configuration, the eyelid (front cover) can be stably and firmly attached, and the distance between the case body and the front cover can be reliably maintained. The sides can be flushed and the appearance can be improved.

The chain cover according to the present invention comprises:
The support seat is formed at a hole edge of an eyeball hole formed in a rearward tapered shape from a rear end of the front gear, and a mounting hole for an eyeball lid positioned at the support seat is formed. (Claim 4). In this case, a work space for chain hanging work or the like becomes large, and workability is improved. Preferably, the mounting hole is provided at a rear portion of the front cover support seat. Furthermore, the chain case according to the present invention includes:
The rear cover is hinged below the rear end of the case main body, and the rear cover is detachably locked and fixed above the rear end of the case main body. ).

By adopting such a configuration, the rear cover can be easily opened, the assembling to the case body is easy, and the appearance can be refreshed. Also,
A full-length chain case according to the present invention is a full-length chain case for a bicycle configured to entirely cover a front gear of a bicycle, a rear gear, and a chain wound around both gears, wherein the chain case is formed on a front side and a back side. The front side and the back side are connected by a hinge on one of the lower side and the upper side, and the front side and the back side are configured to be openable and closable about the hinge, and the front side and the back side are closed and held. It is characterized by comprising a locking means (claim 6).

According to this structure, when the front side of the case body is opened outside, that is, the front side, at the time of the chain hooking work at the time of repairing the detachment of the chain as well as the bicycle assembling, the chain hooking to the front gear and the rear gear is performed. It can be performed easily and efficiently. Also. When the entire chain case is made of synthetic resin, the structure of the molding die is simplified, the moldability is good, and the cost can be reduced. And, the entire chain case according to the present invention, on the front side of the case body, an opening larger than the front gear is provided on an outer portion of the front gear,
It is characterized in that the opening is openably and closably closed by a front cover having at least a hole through which the crankshaft can be inserted.

With such a configuration, operations such as adjustment of the tension wheel disposed in the lower traveling belt of the chain and repair of the detached chain can be easily performed by opening the front cover. Furthermore, the full-length chain case according to the present invention can be configured such that a support protrusion with a bolt or a screw hole is provided on one or both of the opposing inner surfaces of the front side and the back side of the case main body. Item 8). In this case, both the front and back sides of the case main body are supported via the support protrusions, the gap between the two is maintained, and the case is securely and firmly connected by bolts or screws to secure required strength. be able to. When the chain case is made of synthetic resin, the protrusions can be integrally formed, so that the rigidity of the case body can be increased and the durability can be improved.

In the full-length chain case according to the present invention, an engaging portion is provided on the front side and the back side of the case main body on the opposite side of the hinge portion, and is latched by a latching means so as to be freely detachable. There is a feature in the point. In this case, the locking means is preferably provided on the engaging portion, and can be constituted by a projection and a hole into which the projection is fitted, and further can be constituted by a hook and a locking hole. With this configuration, the front and rear sides of the case main body can be easily engaged and disengaged with one another with a single touch. In addition, a screw can be adopted as the locking means.

A full-length chain case according to the present invention is formed so as to entirely cover a front gear, a rear gear, and a chain wound around both gears of the bicycle, and further includes a case body that covers the front from near a hub shaft. A rear cover which is openably and closably connected to a rear opening edge of the main body and is formed so as to cover the rear from near the hub axle, wherein the rear cover is detachable hinge. Is connected to the lower side of the case main body, and the upper side of the rear cover is removably locked and fixed to the upper side of the case main body by locking or fixing means (claim 10).

In this case, the rear cover can be easily attached to the case main body and can be easily removed from the case main body, so that the rear cover can be easily assembled. The workability can be greatly improved. The entire chain case according to the present invention includes a hook-shaped hinge piece provided with the hinge on the case body and having an open front side, a hinge pin locked by the hinge piece, and a rear end connected to both ends of the pin. It can be constituted by a pair of hinge pieces connected to the cover.
1).

According to this configuration, the hinge pin can be easily engaged with and disengaged from the hook-shaped hinge piece.
In addition, a temporary locking / holding means for holding the rear cover in a fully open state is provided on the hinge or the hinge of the case body and the rear cover and the vicinity thereof,
During transportation on the bicycle assembly line, the rear cover is located above the inverted bicycle,
The rear cover can be held upright by the holding means. Therefore, it is possible to prevent the rear cover from naturally falling down during the assembling and to block the rear opening of the case body. (Claim 12).

The means for temporarily locking and holding the rear cover can be constituted by projections or projections and locking recesses into which the projections fit. In this case, one locking projection is provided on the case body on both sides of the hook-shaped hinge piece,
When the other locking projection is located on the lower side of the hinge piece at both ends of the hinge pin and the rear cover is fully opened (ie, standing),
By providing the rear side cover so as to be located on the rear side of the case body side locking projection, the both locking projections can be locked so that the rear cover holds the upright state. Further, one of the locking projections may be a locking recess, and the locking projection may be provided on the hinge pin and the locking recess may be provided on a hinge piece on the case body side.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an embodiment of a first invention (an invention described in claims 1 to 4) of an entire chain case 1 for a bicycle according to the present invention. The entire chain case 1 is made of a synthetic resin such as ABS, PP, or polycarbonate, and has a front gear (see reference numeral 72 in FIG. 9), a rear gear (see reference numeral 73 in FIG. 9), and a chain wound around both gears. (See reference numeral 74 in FIG. 9)
Case body 2 which is formed so as to cover the entirety of the rear gear and covers the front from the hub shaft (see reference numeral 75 in FIG. 9) of the rear gear.
And a rear cover 3 that is openably and closably connected to a rear opening 2D of the main body 2 and covers the rear from near the hub shaft, and an eyeball hole 4 formed in a front gear front side 2A of the case body 2. Is composed of a front opening 2C at the front end side 2C of the front of the front gear and having a large-sized eye hole 4 and a front cover (eye cover) 5 for closing the chain operation opening. Have been.

The case body 2 of the chain case 1 includes:
As described above, the eyeball hole 4 formed in the front side portion 2A of the front gear has a chain operation opening in which the front end side 2C is opened in an arc shape over a half circumference of the gear at the front side of the front gear. The hole 4 and a chain operating opening provided in front of the hole 4 are openably and closably closed by a front cover 3 having a hole 6 through which at least a crankshaft can be inserted. The maximum vertical width of the opening 4 is made larger than the outer diameter of the front gear, and the rear side of the opening 4, that is, the rear gear side, extends rearward from the rear end of the front gear to secure a large opening area. ing.

The opening 4 is provided with a chain operating opening which is opened forward from the vicinity of the center of the crankshaft on the front end side 2C of the case main body 2 and has an opening edge on the front side 2A. The front cover support seat 7 is inserted into the rear side portion 2B side of the case body 2 by the thickness of the front cover 5 and is fitted to the edge of the eye hole formed in the rearward tapered shape from the rear end of the front gear.
Is provided. A cover mounting hole 8 is provided at the rear end of the support seat 7 at the center in the up-down direction, so that the eye lid 5 can be inserted from the front and positioned on the support seat 7.

The front edge 9 of the back side 2B of the case body 2
Is formed in a semicircular shape having the same diameter as or smaller than the outer diameter of the front gear, and a crankshaft insertion hole 10 for the bicycle is provided at the center of the nine arcs of the end edge. The front end of the insertion hole 10 has a hook-shaped cover locking piece 1 protruding rearward.
1 are formed (see FIG. 3). Further, a cover locking step 12 is provided on the back surface of the front end of the back side portion 2B,
The front cover 5 can be stably and securely attached to the case main body 2. Further, a bolt insertion hole 13 is provided in the rear side portion 2B of the case body 2 at a position facing the cover mounting hole 8.

The latter half of the case body 2 is
The rear side portions 2A and 2B have substantially the same shape, and a bicycle frame insertion notch 14 opened toward the rear opening 2D is formed at the center in the vertical direction, and the upper and lower sides of the notch 14 are closer to the rear opening 2D. A mounting hole 15 for the bicycle frame is provided. On the rear opening 2D side of the case body 2, the lower surface of the rear cover 3 is attached to the lower surface via a hinge 16 so as to be openable and closable, and a cover locking hole 17 is provided on the upper surface. Locking hook 1 protruding from
8 is fitted and locked into the cover locking hole 17 with one touch.

The rear cover 3 is provided with a notch 19 for hub shaft insertion corresponding to the notch 14 of the case body 2. The front cover 5 is formed in a shape and size capable of closing the chain operation opening and the eyeball hole 4 of the case main body 2 and maintaining a predetermined space between the front cover 5 and the front gear. A bicycle crankshaft insertion hole 6 is provided, and an insertion hole 21 for a mounting screw 20 is provided at a rear end portion corresponding to the mounting hole 8. An inward flange-shaped back side 5C is formed on the front end side 5B of the cover 5 following the back side, and the inner end of the back side 5C is fitted to the cover locking step 12 of the case body 2. Both outer surfaces of the back side 2B of the case body 2 and the back side 5C of the front cover 5 are made flush.

Then, on the rear side 5C of the front cover 5,
The case body back side part 2B is located at the upper and lower center part of the front end.
A rectangular locking hole 22 with which the cover locking piece 11 is engaged is provided. Accordingly, the front cover 5 is positioned by the front cover support seat 7 of the cover main body 2 and the cover locking step 12, and a predetermined distance from the cover main body 2 is maintained. It is fixed by a bolt 20 and a nut 23 screwed thereto. Prior to assembling the main body 2 to the crankshaft and the front gear, the full-length chain case 1 is attached to a bicycle frame (not shown).
Attached by

In the above embodiment of the first invention, when the chain case 1 is mounted on the frame of the bicycle, the mounting member is first mounted on the boss portion of the frame in a flow step in which the bicycle is turned upside down. Subsequently, in a state where the main body 2 of the chain case 1 is turned upside down, the rear side portion 2B is mounted on the frame via the mounting member, and the front gear and the rear gear are mounted on the respective shafts. Next, the chain is wound around the front gear and the rear gear. At this time, the rear cover 3 and the front cover 5
Is open. Accordingly, the front half of the outer peripheral portion of the front gear projects from the case body 2 and most of the rear gear projects rearward from the rear end opening 2D of the case body 2, so that the chain can be easily pulled forward or backward and wound around. It is very workable and efficient.

When the attached chain is detached, the bolt 20 is first removed, the cover engaging piece 11 is pushed to the front side to escape from the engaging hole 22, and the engagement is released. In this state, the front cover 5 can be easily removed from the case body 2 by pulling the front cover 5 forward. Therefore, by pulling the detached chain forward and hanging it around the front gear,
The front cover 5 can be easily repaired, and then the front cover 5 may be attached to the case body 2. On the other hand, when the chain is disengaged from the rear gear,
While holding down, the upper part of the rear cover 3 may be pulled backward to disengage it from the cover locking hole 17 and pivoted about the hinge 16 to open the rear opening 2D, and the detached chain may be hooked again. When the chain hooking operation is completed, the rear cover 3 is turned upward to close the rear opening 2D of the case body 2, and the locking hooks 18 are fitted and locked in the locking holes 17 of the case body 2, and the rear cover is locked. 3 can be closed and locked with one touch.

In the above embodiment, the rear cover 3
The hinge 16 can be integrally formed of a synthetic resin constituting the case body 2 and the rear cover 3. According to the above embodiment of the first invention, in the case of molding with a synthetic resin, the opening 4 for chain operation is opened forward, so that not only the structure of the core mold but also the entire structure of the molding mold is extremely In addition, the moldability is improved, and the manufacturing cost can be reduced. FIGS. 4 and 5 show an embodiment of the second invention (the invention described in claims 5 to 8) of the entire chain case 101 according to the present invention.

In the second embodiment of the present invention, the bicycle full chain case 101 is formed so as to entirely cover the front and rear gears of the bicycle and the chain wound around the two gears, and the front chain hub is provided near the hub shaft. A case body 31 for covering the main body 31, a rear cover 32 connected to the edge of the rear opening 31D of the body 31 so as to be openable and closable and formed so as to cover the rear from near the hub axle; An opening 33, which is slightly larger than the front gear provided at the outer part of the front gear, is provided with a front cover 35 having a hole 34 through which a crankshaft that can be opened and closed is inserted.

The case body 31 is divided into a front side portion 31A and a back side portion 31B, and has peripheral edge portions 36A and 36B which are continuous on the upper and lower sides and the front side, respectively. The front side portion 31A and the rear side portion 31B are connected to the peripheral side. An intermediate portion in the front-rear direction below the edge portions 36A, 36B is integrally formed of synthetic resin so as to be connected by a hinge portion 37, and is configured to be able to open and close around the hinge portion 37. The hinge 37 is thin and can be bent in the front and back directions so that the front and back sides 31A and 31B can be opened and closed.

The peripheral edges 36A and 36B are
Each of the front ends has the same width from the substantially central portion in the vertical direction to the lower side, and the edges are abutted. Also, the peripheral edge 36 of the case body back side 31B.
B has the same width on both the upper and lower sides, but has the upper side lowered inward by the thickness of the case main body 31 to form the step engaging portion 38. In addition, the peripheral edge 36A of the case body front side 31A has its upper side width increased by the width of the step engaging portion 38, and overlaps with the outside of the step engaging portion 38 of the peripheral edge 36B. The two outer surfaces are flush with each other.

Further, the step engaging portion 38 of the peripheral edge portion 36B is provided with a plurality of locking holes 39 of the case main body front side portion 31A, and the peripheral edge portion 3A of the case main body front side portion 31A is provided.
A locking projection (not shown) that fits into and engages with the locking hole 39 is provided on the lower surface of the upper side of the 6A. A cover locking piece 41 having a front cover locking hole 40 is provided on the front end of the peripheral edge 36B of the case body back side 31B so as to protrude toward the front side. The case body front side 31A has the opening 3
3, the thickness of the front cover 35 corresponds to the case body rear side 3
A front cover support seat 42 is provided over the entire circumference to enter the 1B side, and a cover mounting hole 43 is provided at the rear end of the support seat 42 at the center in the vertical direction. A notch 44 for inserting a bicycle frame, which is open toward a rear opening 31D, is formed at the center of the main body in the vertical direction behind the front side 31A of the main body. A protruding flange 45 is provided, and a mounting hole 46 for a bicycle frame is provided above and below the notch 44 near the rear opening 31D.

In the back side 31B of the case main body, a crankshaft insertion hole 47 for the bicycle centered on the approximate center of the front end arc.
A bicycle frame insertion notch 48 is provided at the center in the vertical direction at the rear and corresponds to the notch 44 of the front side portion 31A, and the notch 48 protrudes toward the main body front side portion 31A. A collar 49 is provided. A mounting seat 51 having a mounting hole 50 is provided above and below the notch portion 48 in correspondence with the mounting hole 46 of the front side portion 31A, and the main body front and back side portions 31A, 31B are connected to the mounting holes 46, 50. And are integrally fixed by bolts or screws 53.

A support projection 55 having a bolt or screw hole 54 that matches the cover mounting hole 43 is provided between the notch 48 and the crankshaft insertion hole 47 on the rear side 31B of the main body. ing. The crankshaft insertion hole 47 is considerably larger than the crankshaft so that a mounting member can be fitted and fixed to the bicycle frame boss portion. Is secured. Hook-shaped hinge pieces 57A and 57B project from the front side 31A and the back side 31B of the case main body 31 below the rear opening 31D.
A, 36B, rear cover locking hole 5 near rear opening 31D.
8A and 58B are provided, and when the locking holes 58A and 58B are aligned, the locking projection 59 of the rear cover 32 is fitted and locked. The rear cover 32
Is provided with a hinge piece 60 provided with a hinge pin (not shown) which engages with the hinge pieces 57A and 57B below the hinge piece.
A and 57B can be simultaneously engaged and disengaged (see FIG. 6).

The front cover 35 has a substantially oval shape and is fitted and mounted in the chain operation opening 34. The front cover 35 has a crankshaft insertion hole 34, and a key-shaped locking piece 61 is provided on the back surface of the front end. A bolt or screw insertion hole 62 is provided at the rear end of the projection, and the hole is aligned with the cover mounting hole 43 of the front side 31A of the main body. In the above embodiment of the second invention, when attaching the chain case 101 to the frame of the bicycle, the attachment member is first attached to the boss portion of the frame in a flow step in which the bicycle is turned upside down. Subsequently, with the body 31 of the chain case 101 turned upside down and the front and back sides 31A, 31B opened, the case body back side 31B is attached to the frame via the attachment member, and the front gear and the rear gear are respectively attached. Attach to the shaft.

Next, a chain is wound around the front gear and the rear gear. At this time, the rear cover 32 and the front cover 35 are open. Therefore, since the front half of the front side of the front gear protrudes from the case main body 31 and most of the rear gear protrudes rearward from the rear end opening 31D of the case main body 31, the chain can be easily pulled out or wound forward or rearward. It is very workable and efficient. In this way, when the chain hooking operation is completed, the front side 31A of the main body is replaced with the back side 31B.
After being fitted and locked, the main body front and back 31A, 31
B is fixed to the rear portion with a bolt or a screw, the front cover 35 is fitted into the chain operation opening 33, and the screw 63
As a result, it is fixed to the support projection 55 of the back side 31B of the main body. Further, by attaching the rear cover 32 to the rear opening 31D, the operation can be easily completed.

When the attached chain is detached, first, the bolt or screw 63 is removed, and the cover engaging piece 61 is pushed inward to push the engaging hole 40.
Then, the front cover 35 can be easily removed from the front side 31A of the case body by pulling the front cover 35 backward in a state where the front cover 35 is pulled out of the case body. Therefore, the chain can be easily repaired by hanging the detached chain around the front gear.
May be attached to the opening 33 of the case body 31. If the detachment of the chain cannot be repaired simply by removing the front cover 35, the removal can be easily performed by removing the rear cover 32 and opening the front side 31A of the main body.

Therefore, when the chain is disengaged from the rear gear, the upper portion of the rear cover 32 is pulled rearward while the locking piece 59 of the rear cover 32 is being depressed, disengaged from the cover locking holes 58A and 58B, and the hinge pin is removed. , The rear opening 31D is opened, and the detached chain may be re-hung. When the chain hooking operation is completed, the rear cover 32 is turned upward to close the rear opening 2D of the case body 31, and the locking pieces 59 are locked in the locking holes 58 of the case body 31.
A, 58B, and the rear cover 32 can be closed and locked with one touch.

According to the above-described embodiment of the second invention, the detached chain can be easily and efficiently repaired by removing the front cover 35 and the rear cover 32 or by opening the front side 31A of the case body. It can be carried out. When the entire chain case 101 is made of synthetic resin, the structure of the molding die can be simplified, the moldability and quality can be improved, and the cost can be reduced. And since the support projection 55 and the mounting seat 51 are provided, the assembling strength can be increased. Moreover, the front side 31A of the main body is connected to the rear side 31A.
B can be engaged and disengaged with one touch. further,
Since the front end and the rear end of the front cover 35 are fixed to the main body rear side 31B, the main body front and rear side 31A, 3
1B can be securely and firmly fixed, and the rear cover 32
Are hinge pieces 57A and 57B, hinge pins, hinge pieces 6
0 and the locking pieces 59, the main body front and back sides 31A, 31
The rear end of B can be fixed, and the strength can be increased.

In the above embodiment, the main body front side portion 31A and the main body back side portion 31B can be completely separated and connected by separate hinges. In addition, the support protrusion 55 may be provided on the back surface of the front side 31A of the main body or on the opposing surface of both sides 31A and 31B.
Further, the peripheral edges 36A, 36B of the front and rear sides 31A, 31B can be mutually fixed by screws, and the rear cover 32 and the case body 31 can be fixed by screws. Can also. 6 to 8 show a main part of an embodiment of the third invention (the invention according to claims 9 to 12), and show the rear cover 3 in the embodiment of the second invention.
2 shows a specific structure. 6 and FIG.
The state at the time of assembly in which the chain case 101 is turned upside down is shown. Therefore, the same components as those of the second embodiment are denoted by the same reference numerals as in FIG. 5, and the features of the third invention will be described in detail.

The case body 31 includes a front side 31A and a back side 31B. Hook-shaped hinge pieces 57A and 57B having an open front overlap the lower outer surface of the rear opening 31D when the case body 31 is closed. Thus, the hinge pieces 57A, 57A are formed integrally with the front side 31A and the back side 31B.
A temporary locking / holding projection 64 for temporarily holding the fully open state of the rear cover 32 is provided on the lower surface of the front and back sides 31A and 31B, which is located on the outer side opposite to 7B and in the center in the front-rear direction. Under the front opening 32A of the rear cover 32, hinge pieces 60A, 60B extending forward in parallel with each other are provided at the same or slightly wider intervals as the thickness of both the hinge pieces 57A, 57B. A hinge pin 65 is integrally formed between the tip portions of the hinge pieces 60A, 60B, and the hinge pieces 60A, 60B are formed integrally with each other.
A temporary locking / holding projection 66 is provided on the lower surface of the distal end portion of the front side of the hinge pin 65 so as to be located closer to the front than just below the center of the hinge pin 65 and can be locked to the rear side of the projection 64. 66 constitutes temporary locking / holding means.

Above the front opening 32A of the rear cover 32, a bifurcated locking portion 68 having a locking claw 67 on the inside facing the front and back sides is formed to protrude forward from the front opening 32A. . Then, the main body front and back sides 31A, 3
Above the rear opening 31D of 1B, a locking projection 69 that is fitted and locked between the locking claws 67 of the locking part 68 is formed so that the rear cover 32 can be closed and locked with one touch at the same time. Is configured. According to this embodiment, the rear cover 32 is detachable from the case main body 31, so that the chain can be easily hooked on the rear gear, and two points are shown in FIG. As shown by the chain line, when the rear cover 32 is fully opened above the case body 31 of the inverted chain case 101, the locking / holding projections 64 and 66 are in the engaged state. Even when the cover 32 is about to rotate in the closing direction, the cover 32 is locked by the projections 64 and 66, and the fully opened state shown by the solid line in FIG. 8 is maintained. Therefore, the rear cover 32 does not naturally rotate in the closing direction, for example, while the chain is being hooked on the rear gear, and does not need to be opened again, so that the chain hooking operation can be performed easily and efficiently. Is possible.

In the above embodiment, one of the holding projections 64 and 66 constituting the temporary locking / holding means can be a locking hole or a concave portion.
Are provided with the holding projections 66, and hook-shaped hinge pieces 57A,
A configuration in which a locking hole or a concave portion is provided on the inner peripheral surface of 57B may be adopted. The hinge piece 57 has a round pin hole instead of a hook shape.
6, a pin hole may be provided, and a separate hinge pin may be detachably attached to both pin holes.

The embodiment of the third invention can be applied to the embodiment of the first invention, and can be applied to the rear cover of the conventional full-length chain case. In the above embodiments of the present invention, the entire chain case 1, 101
Indicates a case made of a synthetic resin, but it can be made of a thin metal plate, that is, a sheet metal, and adopts fixing means such as bolts and screws instead of locking means such as one-touch, and is detachable. The design can be changed as appropriate.
In the embodiment of the second invention, the front cover 35 can be detachably attached.
5, that is, the chain operation opening 33 is not provided in the case body front side 31A. In this case, the chain operation can be easily performed by opening the case body front side 31A.

Further, in the second invention, the hinge portion 37
Can be provided on the upper side of the case main body 31, and the fitting / locking section can be provided on the lower side.

[0045]

According to the full-length chain case for a bicycle according to the present invention, the chain can be pulled out from the front side of the front gear to the front of the case body, and the chain can be hooked easily and efficiently. Moreover, when the chain case is formed of a synthetic resin, the structure of the molding die can be simplified, the moldability can be improved, and the quality can be improved. Also, in the full-length chain case according to the present invention, the case body is divided into a front side portion and a back side portion, and the front side portion and the back side portion are connected by a hinge at a lower side or an upper side, and can be opened and closed around the hinge portion. When the chain is attached to the bicycle at the time of assembling the bicycle as well as at the time of repairing the detachment of the chain, if the front side of the case body is opened outside, that is, the front side, the chain can be easily hooked to the front gear and the rear gear. It can be performed efficiently. Also. When the entire chain case is made of synthetic resin, the structure of the molding die is simplified, the moldability is good, and the cost can be reduced.

In the full chain case according to the present invention, the rear cover is connected to the lower side of the case main body by a detachable hinge, and the upper side of the rear cover is connected to the upper side of the case main body by the locking or fixing means. The rear cover can be easily attached and detached from the case main body because it is locked and fixed so as to be freely detachable, and can be easily detached from the case main body, so that it is easy to assemble and the chain to the rear gear. It is only necessary to remove the rear cover at the time of restoring the hook or the detachment of the chain, so that the workability can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the first invention.

FIG. 2 is an exploded perspective view of the same embodiment.

FIG. 3 is an exploded perspective view of a front rear surface of the embodiment.

FIG. 4 is a perspective view showing an embodiment of the second invention.

FIG. 5 is an exploded perspective view of the same embodiment with a rear cover removed.

FIG. 6 is an exploded perspective view of a main part at the time of handstand according to the embodiment of the third invention.

FIG. 7 is a front view of the embodiment with the rear cover fully opened.

FIG. 8 is a rear view of a main part at the time of handstand according to the embodiment;

FIG. 9 is a schematic front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Full chain case 2 Case main body 2A Front side 2B Back side 2C Front end 2D Rear opening 3 Rear cover 4 Chain operation opening (eyeball hole) 5 Front cover (eyeball lid) 6 Crankshaft insertion hole 7 Front cover support Seat 8 Cover mounting hole 10 Crankshaft insertion hole 16 Hinge 17 Cover locking hole 18 Locking hook 31 Case body 31A Front side 31B Backside 31D Rear opening 32 Rear cover 33 Chain operation opening 34 Crankshaft insertion hole 35 Front cover 37 Hinge part 38 Step engaging part 39 Lock hole 57A Hinge piece 57B Hinge piece 58A Lock hole 58B Lock hole 59 Lock piece 60A Hinge piece 60B Hinge piece 64 Temporary lock / holding projection 65 Hinge pin 66 Temporary lock / Holding projection 68 Locking part 69 Locking projection 101 Full-length chain case

Claims (13)

[Claims] An eyeball hole is formed on the front side of the front gear, the eyeball hole being formed on the front side of the front gear, the rear gear, and a chain wound around the two gears. The eyeball hole is provided with a chain operation opening by opening the front of the front gear, and the eyeball lid is configured to close the eyeball hole and the chain operation opening. A full-length chain case for bicycles, characterized in that: 2. The full-length chain case for a bicycle according to claim 1, wherein the chain operation opening is formed on a front side of a front gear and over a half circumference of the gear. 3. The full-length chain case for a bicycle according to claim 1, wherein the eyeball hole has a support seat for positioning an eyeball lid at a rear side of a front gear at an edge of the hole. 4. The support seat is formed at a hole edge of an eyeball hole tapered rearward from a rear end of a front gear, and a mounting hole for an eyelid cover positioned at the support seat is formed. The full-length chain case for a bicycle according to claim 3, characterized in that: 5. A rear cover that covers the rear gear is hinged below the rear end of the chain case, and the rear cover is detachably locked and fixed above the rear end of the chain case. 5. The method according to claim 1, wherein
Full-length chain case for bicycles according to any of the above. 6. A bicycle full-length chain case configured to entirely cover a front gear, a rear gear, and a chain wound around both gears, wherein the chain case is divided into a front side portion and a back side portion. A locking means that connects the front side and the back side with one of the lower side and the upper side by a hinge part and is configured to be openable and closable about this hinge part, and that closes and holds the front side part and the back side part. A full-length bicycle case for bicycles. 7. An eyeball hole, which is larger than a diameter of the front gear, is provided on an outer portion of the front gear on the front side portion,
The full-length chain case for a bicycle according to claim 6, further comprising an eye lid for closing the eye hole. 8. The full-length bicycle chain according to claim 6, wherein a support projection with a bolt or a screw hole is provided on one or both of the opposed inner surfaces of the front side portion and the back side portion. Case. 9. The bicycle full-length chain case according to claim 6, wherein the front side portion and the back side portion are made of a synthetic resin. 10. A case body formed so as to entirely cover the front gear, the rear gear of the bicycle, and the chain wound around the two gears, and covering the front from near the hub axle, and opening and closing the rear opening edge of the body. A bicycle full-length chain case comprising a rear cover formed so as to be freely connected and to cover the rear from near the hub shaft, wherein the rear cover is connected to a lower side of the case body by a detachable hinge. An entire chain case for a bicycle, wherein an upper side of the rear cover is detachably locked and fixed to an upper side of the case body by locking or fixing means. 11. A hinge-shaped hinge piece provided on the case main body, wherein the hinge is provided on a case body, a hinge pin engaged with the hinge piece, and a pair of hinges connected to both ends of the pin and connected to a rear cover. The full chain case for a bicycle according to claim 10, wherein the case is constituted by a hinge piece. 12. The hinge or the hinge and the vicinity thereof,
The full-length chain case for a bicycle according to claim 10 or 11, further comprising temporary locking / holding means for holding the rear cover in a fully opened state. 13. The full-length chain case for a bicycle according to claim 12, wherein the means for temporarily locking / holding the rear cover comprises protrusions or locking holes into which the protrusions fit.