Ecosystem Graphic Organizer. Absorption Costing. People Also Search. Brake Caliper Compressor Tool. Car Brake Tools. Brake Piston Compressed. Brake Caliper Press Tool. Brake Caliper Installation. Disc Brake Caliper Tool Set.
C3 Corvette Brake Calipers. Brake Rotor Puller. Ford Brake Caliper Tool. Provisional Application Ser. This invention relates to hand tools and more particularly to a tool for use in disc brake repair.
On automobiles equipped with front disc brakes, the piston must be retracted back into the caliper to facilitate the installation of the new brake pads. Typically a good deal of force is required to retract the piston, and the force must be exerted along a line generally parallel to the piston axis. Due to the structure of the caliper which encloses the piston, it is not a straightforward task to apply the necessary force along the proper line to readily retract the piston. While various hand tools might be used to pry the piston back into its caliper, there is the chance of damaging the face of the piston which would have the adverse effect of distorting the piston face which is to bear against the rear surface of the new brake pad.
In view of the foregoing, it is a general aim of the present invention to provide a hand tool with a power assist capable of readily and reliably retracting the piston into the caliper of a standard automotive-type brake caliper. In greater detail, it is an object to provide a hand tool with a power assist mechanism for generating the necessary force without requiring extraordinary strength on a part of the user.
A further object is to provide a tool which is relatively simple to use and reasonably inexpensive to acquire. Other objects and advantages of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the invention.
In the drawings:. While the invention will be described in connection with certain preferred embodiments, there is no intent to limit it to those embodiments. On the contrary, the intent is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the invention as defined by the appended claims. Turning now to the drawings, there is shown a hand tool 20 which is particularly suited for retracting the piston of an automotive-type disc brake system into the caliper.
The tool 20 has a main body 21 and a pair of handles 22 , 23 which allow gripping of the tool and actuation of an advance mechanism. Slidably supported on the body 21 of the tool 20 is a spreader plate assembly As suggested by the solid and dashed lines, the spreader plate assembly 25 has a normally retracted position identified as 25 a, and an extended position identified as in dashed lines by 25 b.
As best shown in FIG. Affixed to the body 21 is a similar spreader plate The spreader plate 26 can also have a disc shape segment Challenge your brain with this fun, free word scapes game!
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If color Product easily kind size: to easy Tub color: surface feet To use the apparatus 10 on a double or quad piston caliper, such as in FIG. The spacers 63 and 64 are positioned into the dual U-shaped slots a and c, respectively, and located on the bottoms b and d of the U-shaped slots a and c, respectively.
The push plate 83 will be aligned with the caliper pistons and in FIG. The handle 21 can be squeezed in direction A to apply pressure to the push plate 83 and wedge the wedge plate 72 into the caliper housing portion thereby applying pressure to the caliper pistons and Once the pistons and are moved back, simply pressing the portion 13 a of the release trigger 13 returns the press plate 83 to its starting position.
The quadruple caliper piston, includes caliper housing which includes portions and The apparatus includes pistons , , , and The insertion and operation of the apparatus 10 in the caliper housing is the same as for the double piston example of FIGS. The first cam plate 44 , second press or push plate 83 , third tube plate 70 , and fourth wedge plate 72 can be plates that were developed and field tested under actual working conditions with caliper pistons.
In order to arrive at the design for the plates 44 , 83 , 70 , and 72 shown by FIGS. The particular shape shown for the plates 44 , 83 , 70 , and 72 in FIGS.
All components of the apparatus 10 can be built with industrial grade materials. A case hardened steel shaft can be used for rod 30 shown in FIG. The Tube housing 38 shown in FIG. The tube housing 38 can be preformed tubing of aluminum or steel. The wedge plate 72 , push plate 83 , and cam plate 44 , tube plate 70 , tube cap 34 , as shown in FIG. Stationary handle 20 and pull handle of portion 21 of the handle assembly 12 as seen in FIGS. Pivot pin 22 and restraining pin 23 can be cast or machined steel.
Rod driver 19 can be cast or machined steel and case hardened, and can include, but is not limited to surface hardening treatments; i. The design of apparatus 10 is cost effective and allows the apparatus 10 to be easily and affordably repaired. The apparatus 10 has a spring loaded trigger release mechanism which includes springs 81 a and 82 a. This spring loaded trigger release mechanism allows for one hand operation of the apparatus This allows a technician to perform a task in a safer manner and also speeds up the process.
The embodiment of the current invention shown by FIGS. The apparatus 10 is a much stronger tool than that of the prior art. The apparatus 10 has a short case hardened single push rod 30 that's connected to the cam plate The cam plate 44 in turn applies equal pressure to a dual push rod assembly, which includes rods 81 and 82 , that connects from the cam plate 44 to the push or press plate This results in a more stable configuration which will not allow the push rods 30 , 81 , or 82 to bend or warp when under the pressure necessary to retract caliper pistons.
The apparatus 10 , including the push plate 83 and wedge plate 72 , was developed and tested by brake technicians on a daily basis. The particular configuration for the push plate 83 and the wedge plate 72 shown in FIGS. This push plate 83 and wedge plate 72 combination accommodates virtually all front and rear disc brake calipers with single, double and quad piston designs. Although the invention has been described by reference to particular illustrative embodiments thereof, many changes and modifications of the invention may become apparent to those skilled in the art without departing from the spirit and scope of the invention.
It is therefore intended to include within this patent all such changes and modifications as may reasonably and properly be included within the scope of the present invention's contribution to the art. An apparatus comprising: a first rod;. The apparatus of claim 1 further comprising a first plate;.
The apparatus of claim 2 further comprising a second plate;. The apparatus of claim 3 further comprising a third plate; and. The apparatus of claim 4 further comprising a fourth plate; and. The apparatus of claim 5 further comprising first and second spacers; and.
The apparatus of claim 5 further comprising a fourth rod;. The apparatus of claim 7 further comprising a fifth rod;. The apparatus of claim 1 further comprising a handle assembly connected to the first rod; and.
The apparatus of claim 1 further comprising a first spring through which the second rod is inserted; and. The apparatus of claim 9 wherein the handle assembly includes a trigger release device which if activated after the first rod has moved in the first direction causes the first rod to move in a second direction which is opposite the first direction.
A method comprising: placing an apparatus in a first state;. The method of claim 12 wherein the caliper piston is a double caliper piston. The method of claim 12 wherein the caliper piston is a single caliper piston.
The method of claim 12 wherein the apparatus includes a handle assembly connected to the first rod; and. The method of claim 12 wherein the apparatus includes a first plate, wherein the first rod, the second rod, and the third rod are connected to the first plate; and. The method of claim 16 wherein the apparatus includes a second plate, wherein the second plate is connected to the second rod and the third rod; and.
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