Abstract:
A tool set for replacing brake pads of disc braking systems in the present invention includes a screw rod, a sleeve, a first plate body, a second plate body, a guide rod, and at least one connector with various sizes, by which a selective combination of the components described above is capable of providing an automobile with a specialized tool for pressing an outward piston to its initial position for convenient replacing new brake pads when the outward piston is gradually traveled toward old brake pads with a continuous wearing in linings of the old disc brake pads. Moreover, various selective combinations of the components described above are also capable of providing automobiles employed with different types of disc braking systems with variety of suitable specialized tools fitting functional requirements and being convenient in operation.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a tool set for replacing brake pads of disc braking systems, particularly to one provided with a screw rod, a sleeve, a first plate body, a second plate body, a guide rod, and at least one connector with various sizes, by which a selective combination of the components described above is capable of providing an automobile with a specialized tool for pressing an initial piston to its initial position for convenient replacing new brake pads when the outward piston is automatically traveled toward old brake pads with a continuous wearing in linings of the old brake pads. Moreover, various selective combinations of the components described above are also capable of providing automobiles employed with different types of disc braking systems with variety of suitable specialized tools fitting functional requirements and being convenient in operation, thereby achieving a high use rate and being convenient for storage. 
     2. Description of the Prior Art 
     Generally speaking, a braking mechanism for an automobile, referring to FIG. 1, mainly includes a brake disc  10 , a caliper  11 , a pair of brake pads  12 , a cylinder  13  and a piston  14 . The brake disc  10  is rotated with a wheel of an automobile. The caliper  11  correspondingly disposed at one end of the brake disc  10  is combined with the pair of brake pads  12  and has the cylinder  13  disposed at one side. The cylinder  13  is provided with a piston  14  therein. When a driver pressed a brake pedal, brake fluid is forced from a master cylinder into the cylinder  13  to push the piston  14  the brake disc  10  to produce braking action to forcedly stop the rotation of the wheel. When the linings  120  of the brake pads  12  are worn too thin under a certain thickness after a period of use, the brake pads  12  are required to be replaced with new ones to maintain a good braking force for securing safety in driving. However, with a continuous wearing to the linings  120  of the brake pads  12 , the piston  14  is gradually traveled outward into the caliper  11  to make the space of accommodating the brake pads  12  in the caliper  11  become narrower and narrower. Therefore, it is needed to use a specialized tool to press the outward piston  14  to its initial position when replacing new brake pads  12 . 
     SUMMARY OF THE INVENTION 
     The main purpose of the invention is to offer a tool set for replacing brake pads of disc braking systems capable of making various selective combinations for automobiles employed with different types of disc braking systems and convenient in operation and for storage within little space. 
     The main feature of the invention is to provide a tool set for replacing brake pads of disc braking systems including a screw rod, a sleeve, a first plate body, a second plate body, a guide rod, and at least one connector with various sizes, wherein the screw rod has one end combined with a sliding handle and the other end provided with a coupling portion as well as a tapered plane; the sleeve capable of being extended through and screwed by the screw rod has a hollow internal-threaded passage formed therein and a flange formed at one end; the first plate body capable of being extended through by the screw rod has a big-bore hole, a middle-bore screw hole and a small-bore hole orderly arranged from the center of the first plate body to one side of the first plate body; the second plate body capable of being extended through by one end of the second plate body capable of being extended through by one end of the screw rod has a first hole, a second hole and a third hole orderly arranged from the center of the second plate body to one side of the second plate body with their centers respectively aligned with those of the big-bore hole, the middle-bore screw hole and the small-bore hole of the first plate body; the guide rod capable of extending through the small-bore hole of the first plate body as well as the third hole of the second plate body disposed at an outer end of the second plate body has a connecting portion disposed at one end of the guide rod for being fixed to the first plate body; the connector has an insert hole formed in the center capable of being extended through and engaged by the coupling portion of the screw rod as well as at least one projection disposed in a proper position on one surface of the connector for being correspondingly fitted into and engaged with at least one engagement groove located in a front surface of a piston, by which a selective combination of the components described above is capable of providing an automobile with a specialized tool for pressing an outward piston to its initial position for replacing new brake pads when the outward piston is gradually traveled toward old brake pads with a continuous wearing in linings of the old brake pads. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is a schematic view showing the construction of a disc brake mechanism; 
     FIG. 2 is an exploded perspective view of a tool set for replacing brake pads of disc braking systems in the present invention, showing all components of the tool set; 
     FIGS. 3A,  3 B,  3 C,  4 A,  4 B and  4 C are perspective views of the tool set for replacing brake pads of disc braking systems in the present invention, showing connectors with various types and sizes; 
     FIG. 5 is a perspective view showing a first preferred embodiment of the tool set for replacing brake pads of disc braking systems in the present invention, showing a first selective combination of the components of the tool set; 
     FIG. 6 illustrates from a front view of a caliper, showing the first preferred embodiment of the present invention in operation; 
     FIG. 7 is a perspective view showing a second preferred embodiment of the tool set for replacing brake pads of disc braking systems in the present invention, showing a second selective combination of the components of the tool set; 
     FIG. 8 illustrates from a top view of the caliper, showing the second preferred embodiment of the present invention in operation; 
     FIG. 9 is a perspective view showing a third preferred embodiment of the tool set for replacing brake pads of disc braking systems in the present invention, showing a third selective combination of the components of the tool set; 
     FIG. 10 illustrates from the front view of the caliper, showing the third preferred embodiment of the present invention in operation; and, 
     FIG. 11 is a schematic view of the tool set for replacing brake pads of disc braking systems in the present invention, showing the components of the tool set deposited in a case for convenience of storage and management. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A tool set for replacing brake pads of disc braking systems in the present invention, as shown in FIGS. 2,  3  and  4 , includes a screw rod  2 , a sleeve  3 , a first plate body  4 , a second plate body  5 , a guide rod  6 , and at least one connector  7  with various sizes as main components. 
     The screw rod  2  has one end extended through by a sliding handle  20  and the other end provided with a coupling portion  21  as well as a tapered plane  22 . The coupling portion  21  has a ball  210  disposed on one sidewall of the coupling portion  21  and urged by a spring therein for elastic movements. The tapered plane  22  is formed between the coupling portion  21  and the screw rod  2 . Moreover, the one of the screw rod  2  that is extended through by the sliding handle  20  is capable of being provided with a polygonal portion  23  for selective operation with a wrench or a socket tool. 
     The sleeve  3  capable of being extended through and screwed by the screw rod  2  has a hollow internal-threaded passage  30  formed therein and a flange  31  with a larger circumferential plane formed at one end of the sleeve  3 . 
     The first plate body  4  in rectangular shape and capable of being extended through by the screw rod  2  has a big-bore hole  40 , a middle-bore screw hole  41  and a small-bore hole  42  orderly arranged from the center of the first plate body  4  to one side of the first plate body  4 . Moreover, an internal-threaded nut member  43  with reinforcing function is capable of being firmly welded on one side of the middle-bore screw hole  41  of the first plate body  4 . 
     The second plate body  5  in rectangular shape and capable of being extended through by the tapered plane  22  of the screw rod  2  has a first hole  50 , a second hole  51  and a third hole  52  orderly arranged from the center of the second plate body  5  to one side of the second plate body with their centers respectively aligned with those of the big-bore hole  40 , the middle-bore screw hole  41  and the small-bore hole  42  of the first plate body  4 . Moreover, a hollow stub pipe  53  with reinforcing function is capable of being firmly welded on one side of the third hole  52  of the second plate body  5  being firmly welded on one side of said third hole of said second plate body as an outstretched portion of the third hole of the second plate body and communicated with the third hole  52  of the second plate body  5 . 
     The guide rod  6  capable of extending through the small-bore hole  42  of the first plate body  4  as well as the third hole  52  of the second plate body  5  disposed at an outer end of the second plate body  5  has a connecting portion  60  with smaller diameter disposed at one end of the guide rod  6  and provided with a ring groove  61  for being engaged by a retainer ring  62  so that the connecting portion  60  of the guide rod  6  is capable of being fixed to the first plate body  4 . 
     Each of the connectors  7  in discal shape is capable of being provided with various sizes, as shown as in FIGS. 3A,  3 B,  3 C,  4 A,  4 B and  4 C, and has an insert hole  70  disposed in the center as well as at least one projection  71  protruded on one surface or both surfaces. The insert hole  70  with a chamfered edge  700  is convenient for the smooth inserting of the coupling portion  21  of the screw rod  2 . The projections  71  are capable of being disposed in proper positions on both surfaces of the connector  7 , as shown in FIGS. 3B and 3C, or only on one surface of the connector  7 , as shown in FIGS. 3A,  4 A,  4 B and  4 C, for being correspondingly fitted into and engaged with at least one engagement groove  140  located in a front surface of the piston  14 . Moreover, in order to be correspondingly fitted with pistons having various configurations in front surfaces, the connector  7  is capable of being provided with a protective lip  72  protruded around the circumference of connector  7 , as shown in FIGS. 4A,  4 B and  4 C, for being covered on a circumferential edge  141  of the piston  14 . The connector  7  is also capable of being provided with a raised face  73  disposed in a central surface of the connector  7 , as shown in FIG.  3 A. All the connectors  7  as described above are designed to press a kind of spiral-forward piston  14  to its initial position. Because the kind of piston  14  is traveled toward the brake pads  12  in a spiral-forward way, a tight engagement between the connector  7  and the front surface of the piston  14  is capable of having the piston  14  pressed to its initial position under the rotation of the screw rod  2 . 
     A first preferred embodiment of the tool set for replacing brake pads of disc braking systems in the present invention, as shown in FIGS. 5 and 6, is a first selective combination of components of the tool set used to press a piston  14  that is disposed in a caliper  11  with a central recess  110  to its initial position. In assembling, referring to FIG. 5, firstly extend a rear end of the sleeve  3  through the big-bore hole  40  of the first plate body  4  to have the flange  31  of the sleeve  3  attached against a front surface of the first plate body  4 . Secondly, extend the coupling portion  21  of the screw rod  2  through the sleeve  3  from the rear end of the sleeve  3  to have the sleeve  3  screwed with the screw rod  2 . Thirdly, extend the coupling portion  21  of the screw rod  2  through the first hole  50  formed in the center of the second plate body  5  to have the second plate body  5  rested against the tapered plane  22  of the screw rod  2 , by which a first specialized tool is assembled. In operating, as shown in FIG. 6 illustrating from a front view of the caliper  11 , firstly align the screw rod  2  with an axis of the piston  14 , contact the second plate body  5  with a front surface of the piston  14  and retain the first plate body  4  attached with the flange  31  of the sleeve  3  against an inner surface of the central recess  110  of the caliper  11 . Secondly, hold the sleeve  3  with one hand and rotate the sliding handle  20  of the screw rod  2  with the other hand, by which the sleeve  3  and the first plate body  4  are held tightly so that they can be firmly retained against the inner surface of the caliper  11 , and the screw rod  2  is screwed with the threads formed in the inner wall of the passage  30  of the sleeve  3  so that the second plate body  5  is capable of being in a steady location. Therefore, under the rotation of the screw rod  2 , the second plate body  5  is moved forwardly to press the piston  14  gradually to its initial position. 
     A second preferred embodiment of the tool set for replacing brake pads of disc braking systems in the present invention, as shown in FIGS. 7 and 8, is a second selective combination of components of the tool set used to press a piston  14  that is disposed in a caliper  11  without a central recess  110  to its initial position. In the situation, the screw rod  2  is unable to be aligned with an axis of the piston  14 . In assembling, referring to FIG. 7, firstly extend the connecting portion  60  of the guide rod  6  through the small-bore hole  42  of the first plate body  4  and have the ring groove  61  of the guide rod  6  engaged by a retainer ring  62  so that the guide rod  6  is fixed to one side of the first plate body  4 . Secondly, screw the screw rod  2  together with the middle-bore screw hole  41  of the first plate body  4  welded with the internal-threaded nut member  43 . Thirdly, extend the coupling portion  21  of the screw rod  2  through the second hole  51  formed in the middle position of the second plate body  5  to have the second plate body  5  rested against the tapered plane  22  of the screw rod  2 . Fourthly, extend the other end of the guide rod  6  through the third hole  52  welded with the hollow stub pipe  53  and allow the second plate body  5  movable along the guide rod  6 , by which a second specialized tool is assembled. In operating, as shown in FIG. 8 illustrating from a top view of the caliper  11 , firstly place the sides of the first plate body  4  and the second plate body  5  not screwed by the screw rod  2  respectively in the interior of the caliper  11 . Secondly, contact the second plate body  5  with the front surface of the piston  14 , by which the screwing of the screw rod  2  with the middle-bore screw hole  41  of the first plate body  4  and the fixing of the guide rod  6  respectively with the sides of the first plate body  4  as well as the second plate body  5  keep the second plate body  5  in a steady location. Therefore, under the rotation of the screw rod  2 , the second plate body  5  is moved forwardly to press the piston  14  to its initial position. In disassembling, disengage the retainer ring  62  from the ring groove  61  of the guide rod  6  and draw the guide rod  6  out of the first plate body  4  and the second plate body  5 . And then, respectively disconnect the second plate body  5  and the first plate body  4  from the screw rod  2 . 
     Moreover, another way of rapidly combining the connecting portion  60  of the guide rod  6  and the small-bore hole  42  of the first plate body  4  together is to have the connecting portion  60  of the guide rod  6  provided with external threads thereon and the small-bore hole  42  of the first plate body  4  provided with internal threads therein. 
     A third preferred embodiment of the tool set for replacing brake pads of disc braking systems in the present invention, as shown in FIGS. 9 and 10, is a third selective combination of components in the tool set used to press a spiral-forward piston  14  that is disposed in a caliper  11  with a central recess  110  to its initial position. In assembling, referring to FIG. 9, firstly extend the rear end of the sleeve  3  through the big-bore hole  40  of the first plate body  4  to have the flange  31  of the sleeve  3  attached against the front surface of the first plate body  4 . Secondly, extend the coupling portion  21  of the screw rod  2  through the sleeve  3  from the rear end of the sleeve  3  to have the sleeve  3  screwed with the screw rod  2 . Thirdly, choose a suitable connector  7  in accordance with the configuration of the spiral-forward piston  14  and insert the coupling portion  21  of the screw rod  2  into the inert hole  70  formed in the center of the connector  7  in which a wall of the insert hole  70  is tightly urged by a ball  210  disposed on one sidewall of the coupling portion  21 , by which a third specialized tool is assembled. In operating, as shown in FIGS. 1 and 10, firstly retain the first plate body  4  against the inner surface of the central recess  110  of the caliper  11 . Secondly, join the connector  7  together with the front surface of the spiral-forward piston  14  by engaging the projections  71  of the connector  7  with the engagement grooves  140  because most of the spiral-forward pistons  14  are provided with at least one engagement groove  140 . Thirdly, hold the sleeve  3  with one hand and rotate the sliding handle  20  of the screw rod  2  with the other hand. Therefore, under the rotation of the screw rod  2 , the connector  7  engaged with the front surface of the spiral-forward piston  14  is rotated to press the spiral-forward piston  14  to its initial position. 
     Moreover, as shown in FIG. 11, a case  8  is used to accommodate all the components of the tool set and is convenient for taking out components to make selective combinations of suitable specialized tools and for storage within little space. 
     The invention has the following advantages and effects, as can be understood from the aforesaid description. 
     1. The tool set of the present invention is capable of making various selective combinations of the components for automobiles employed with different types of disc braking systems. 
     2. The tool set is simple in making selective combinations and easy in operation, thereby decreasing combination time and increasing working efficiency. 
     3. The components of tool set are capable of being placed in only one case, thereby decreasing storage space and being convenient in management. 
     4. The tool set uses the simplest components to make various selective combinations for different automobiles, thereby greatly decreasing the purchasing cost of the tools. 
     While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.