Abstract:
A brake structure for a reel comprising a rotary member rotatable in a spool transmission system, a centrifugal brake device including a brake block radially slidably mounted on the rotary member and a brake shoe attached to a fixing structure, and a position maintaining mechanism for allowing slide movement of the brake block to maintain the brake block in an operative position for effecting a braking operation and a retaining position for moving the brake block away from the brake shoe. The brake block is reversibly moved from the operative position to the retaining position upon release of the positional maintenance.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a brake structure for a reel, and more particularly to a brake structure comprising a rotary member rotatable in a spool transmission system, a brake block slidably and radially mounted on the rotary member, and a brake shoe attached to a fixing structure, said brake block and brake shoe constituting a centrifugal brake device. 
     2. Description of the Related Art 
     The conventional brake blocks in general act on the brake shoe upon rotation of the rotary member. 
     However, even when only free rotation of the spool is required to be inspected, the centrifugal brake device is disadvantageously operated. Apart from such a case, with reels having a plurality of centrifugal brakes for exchanging one brake block for any other brake block of different weight in order to adjust the braking force according to a diameter of a fishing line or mass of a weight, it is difficult to find any suitable place to keep the removed brake block. As a result, the detached brake block sometimes tends to be lost. 
     SUMMARY OF THE INVENTION 
     A primary object of the present invention is to provide a structure for maintaining the brake block in a retaining position for moving the brake block away from the brake shoe while readily switching the brake block between the retaining position and an operative position. 
     In order to fulfill the above-noted object, the present invention is characterized by a brake structure comprising a position maintaining mechanism for maintaining the brake block in an operative position for allowing sliding movement of the brake block to effect a braking operation, and in a retaining position for moving the brake block away from the brake shoe, the brake block being reversibly moved from the operative position to the retaining position upon release of the positional maintenance. 
     This structure has the following functions and effects. 
     When maintained in the operative position, the brake block acts on the brake shoe under a centrifugal force to produce a braking force corresponding to the applied centrifugal force. On the other hand, when maintained in the retaining position, the brake block does not act on the brake shoe even if the centrifugal force is applied. 
     Thus, a condition in which the centrifugal force is not applied can be realized without removing the brake block from the position maintaining mechanism to easily and quickly change the position of the brake block. In addition, the braking force can be readily adjusted through a plurality of centrifugal brakes. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a rear view in vertical section showing a centrifugal brake device; 
     FIG. 2 is a side view in vertical section showing the relationship between a brake block and a brake shoe of the centrifugal brake device; 
     FIG. 3 is a sectional view showing attachment of a handle to a main shaft; 
     FIG. 4 is a side view of a reel with a cover being opened; 
     FIG. 5 is a top plan view of the reel; 
     FIG. 6 is a side view in vertical section showing another embodiment of the structure for maintaining the brake block of the centrifugal brake device; and 
     FIG. 7 is a side view in vertical section showing a a further embodiment of the brake block of the centrifugal brake device. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A brake structure of a reel according to the present invention will be described in detail hereinafter referring to the accompanying drawings. 
     FIGS. 1, 3 and 5 show a baitcasting reel for use in the present invention which comprises right and left side cases 1, a spool 2 mounted between the side cases to be rotatable in unison with a spool shaft 3. A main shaft 4 forming a spool transmission system is supported by the right side case 1. A drag control element 5 and a handle 6 for winding up a fishing line are mounted on the main shaft 4 to rotate the spool 2. A pair of centrifugal brakes 7 for the spool 2 are mounted on the left side case 1. 
     A mounting structure for the handle 6 will be set forth next. Referring to FIG. 3, the handle 6 includes a grip portion 6A and an arm 6B for supporting the grip portion 6A. The arm 6B is mounted on the main shaft 4. An adapter 8 made of resin is attached to an end portion of the main shaft 4. The arm 6B is mounted on an outer periphery of the resin adapter 8, thereby to avoid direct contact between the main shaft 4 and the arm 6B to prevent corrosion due to a local cell resulting from direct contact between the aluminum arm 6B and the brass main shaft 4. 
     The centrifugal brake device 7 will be described below. As shown in FIG. 1, an end portion of the spool shaft 3 is positioned in a recess defined between an inner peripheral wall 1A of the left side case 1 and the spool 2. A holder 10 acting as a rotary member for housing a brake block 9 is mounted on and rotatable in unison with the end portion of the spool shaft 3. Referring to FIG. 2, each end portion of the holder 10 extending radially of the spool shaft 3 defines a space for housing the brake block 9. Within this space is radially mounted a support shaft 11. The brake block, 9 is slidably attached to the support shaft 11. First projections 12 project inwardly from opposite inner lateral walls of the holder 10 at an opening end portion of the housing space. The first projections 12 are elastically deformable. The brake block 9 is depressed under an elastic deforming force to be placed in the housing space. The brake block 9 defines flange pieces 9A at one end thereof. The brake block 9 contacts the first projections 12 and the flange pieces 9A thereby to prevent the brake block 9 from falling off the housing space. 
     Second projections 13 having the similar structure to the first projections 12 project inwardly from the opposite inner lateral walls of the holder at an inner portion of the housing space opposite to the opening end portion. The brake block 9 is deeply depressed under a deforming elastic force to be maintained at an inner position. 
     With this structure, the brake block 9 is moved inwardly from the second projections to be fixedly placed in that position. When the brake block 9 is pulled out of the position against the elastic force of the second projections 13 to be positioned between the second projections 13 and the first projections 12, the brake block 9 can be slidably movable along an axis of the support shaft 11. One side face of the first projection 12 and of the second projection 13 may be defined as an inclined face 12a or 13a. Such a structure allows the operator to easily depress the brake block 9, and at the same time the brake block 9 does not tend to fall off the projections once depressed. 
     Referring to FIGS. 1 and 2, a brake shoe 14 having an L-shape in section is attached to the inner wall 1A of the left case 1 outwardly of the holder 10. The brake shoe forms a centrifugal brake device 7 operable in cooperation with the brake block 9 pressed to the brake shoe 14 under the centrifugal force. The centrifugal brake device 7 includes a pair of brakes mounted on the holder 10. 
     The second projections 13 and the flange pieces 9A of the brake block 9 are referred to as a position maintaining mechanism A for maintaining the brake block 9 at a retaining position spaced apart from the brake shoe 14. When an operational force greater than the centrifugal force is forcibly applied to move the brake block 9, the brake block 9 is moved to an operative position to be slidable under the centrifugal force. 
     Referring to FIG. 4, a large cutout 1C is defined in an outer peripheral wall 1B and the inner peripheral wall 1A of the left case 1 such that the brake block 9 is operable with a cover 15 being lifted, thereby to be readily moved from the retaining position to the operative position. 
     Other modifications will be set forth below. 
     1) The brake block 9 may be mounted on the housing space without being attached to the support shaft 11. 
     2) The flange pieces 9A of the brake block 9 acting as the position maintaining mechanism A may be elastically deformable. 
     3) In order to apply the operational force to move the brake block 9 from the retaining position to the operative position, a compact solenoid or the like may be provided. 
     4) As shown in FIG. 6, the support shaft 11 may be uprightly mounted on a boss acting as the rotary member 10, and the first projections 12 and the second projections 13 may be defined in the support shaft 11 for maintaining the brake block 9 in the retaining position and the operative position. 
     5) As shown in FIG. 7, the brake block 9 may include a bullet-like block 9a and a plate-like block 9b. The plate-like block 9b, solely or integrally with the bullet-like block 9b, may be movable between the operative position and the retaining position, thereby to allow the braking force to vary. 
     6) More than three spaces for housing the brake block 9 may be defined in the holder. 10, and a number of centrifugal brakes 7 may be provided. With this structure, the respective centrifugal brakes 7 are individually moved between the operative position and the retaining position to allow the brake force to vary in multiple stages. 
     7) In order to maintain the brake block 9 in the retaining position, the support shaft 11 may define an engaging bore to fix the brake block 9 to the support shaft 11 by means of a pin extending through the brake block 9 and the engaging bore. 
     8) in order to maintain the brake block 9 in the retaining position, the brake block 9 may be screwed to support shaft 11.