Retaining ring diameter expansion tool

Abstract

To provide a diameter extending tool that is compatible with boots with various-size using a single tool and can readily and freely extend a diameter of a spiral ring.SOLUTION: A retaining ring diameter extending tool exerts an action by action functions which are evenly disposed in optional positions in a circle of a spiral ring on the basis of a regular polygon, thereby compatible with boots with various-size using a single tool and readily and freely extending a diameter of a spiral ring.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a tool for attaching retaining rings, which are often used in industrial products, to objects. [Background technology]

[0002] There are many types of retaining rings that are widely used in industrial products, including C-rings, E-rings, circlips, spiral rings, and snap rings, and they have a wide range of applications.

[0003] For example, retaining rings commonly known as snap rings are available in shaft and hole versions, and because it is difficult to expand or contract them by hand, a special tool called snap ring pliers is used to enable them to be attached and detached from the target object.

[0004] There are two types of snap ring pliers, which are removal and installation tools, one for shafts and one for holes. The former is a tool that expands the diameter of the ring, allowing it to be installed from the outside of the shaft, while the latter is a tool that reduces the diameter of the ring, allowing it to be installed and removed from the inside of the hole.

[0005] 2. Description of the Related Art A protective cover called a dust boot is attached to ball joints used in steering and suspension systems that are part of the structure of industrial products in general, and particularly automobiles, for the purpose of protecting the ball joints.

[0006] The role of this elastic protective cover called a dust boot (hereafter referred to as the boot) is to prevent foreign objects, including water, from entering the sliding part of the ball joint, and to prevent the leakage of the grease enclosed inside, making it an important safety part (as stated by the Ministry of Land, Infrastructure, Transport and Tourism). However, this boot can become torn due to deterioration over time. As a result, the tear can cause water or foreign objects to enter, or the grease to leak out, which can impair normal functioning and, in the worst case, can cause the ball joint to come off, making it impossible to operate the steering wheel, and even threatening the driver's life. However, replacing the ball joint itself is expensive, so there are parts that allow you to replace just the boot in anticipation of such deterioration, and these are widely used, especially in the automobile maintenance industry.

[0007] Considering the harsh conditions of use, these boots must be firmly fixed all around, and depending on how important this is, there are a variety of attachment methods, including press-fit and snap ring types, all of which aim to provide a strong, all-around fixation.

[0008] For many years, the press-in method was the overwhelmingly mainstream method for fastening these boots among Japanese automakers, but due to its stronger fastening function, the proportion of its use has been reversing in recent years.

[0009] However, the retaining rings (hereafter referred to as spiral rings) used in these boots are installed for the purpose of providing strong fixation, and are therefore extremely difficult to install. For mechanics working on automobiles, installing them poses a considerable technical burden.

[0010] In response to this problem, there have been conventional techniques described in non-patent literature and patent literature in recent years that use tools that enable the installation of a spiral ring by uniformly expanding the diameter when replacing the boot.

[0011] In both of these conventional techniques, a cone-shaped tool like the tip of a rocket called an inserter is used to expand the diameter of the spiral ring and attach it to the boot. [Prior art documents] [Non-patent literature]

[0012] [Non-Patent Document 1] Hasco Co., Ltd., "Lower Boot Inserter (for Suzuki)" [Searched on January 12, 2020] Internet https: / / www.hascotools.co.jp / product / common / 504 [Non-Patent Document 2] Koto Sangyo Co., Ltd., SBI-600 "Boot Band Inserter (for Suzuki)" [Retrieved January 12, 2020] Internet http: / / www.kotosangyo.co.jp / catalogue / vol17-b.pdf [Patent documents]

[0013] [Patent Document 1] Application 2017-2325 Real Climb 3211791 Summary of the Invention [Problem to be solved by the invention]

[0014] There are various types of retaining rings, and their functions, effects, and installation and removal methods vary depending on their shape.

[0015] The replacement of the ball joint dust boots is mainly performed during inspection and maintenance such as vehicle inspections, when cracks, tears, grease leaks, etc. due to deterioration are discovered. In particular, tears and grease leaks will not pass the vehicle inspection, so this is a maintenance that is performed frequently.

[0016] However, the spiral ring, which is a type of retaining ring for these boots, is extremely difficult to install, and the only methods available were to stretch it vertically like a coil spring and install it by hand while rotating it, or to use a special tool, a conventional technique that was only compatible with a very small number of boots.

[0017] In addition, when using snap ring pliers used for general retaining rings such as snap rings, the spiral ring becomes oval when expanding at only two points, making it difficult to ensure clearance for installation, and unlike snap ring pliers used for general retaining rings such as snap rings, spiral rings are generally made of a plate-shaped spring material wound into a ring shape, and although there is actually a start and end to the winding and a break, the continuous winding makes it appear to be a continuous circle. Also, the break in the circle here means that the circle is not connected in a continuous manner, like the letters C and O in the alphabet, and the biggest difference between snap rings and other similar products is that there is no break in the shape of the retaining ring, and this difference makes the methods of expanding the diameter of the two different.

[0018] In addition, the special dedicated tools of the conventional technology are only designed to be compatible with limited vehicle models of some automobile manufacturers, and with the increasing shift from the conventional press-in type to the spiral ring type in recent years, this has placed a heavy burden on automobile mechanics.

[0019] Furthermore, if the specialized tools used in the past were to be compatible with all domestically produced vehicles, dozens of types of expensive tools would be required, which would impose an immeasurable financial burden on repair shops.

[0020] The present invention aims to solve the above-mentioned problems associated with the installation of spiral rings, the difficult manual work involved, the fact that repair shops do not have dedicated tools for this purpose (which are limited to certain vehicle models), and the installation tools used in the prior art. [Means for solving the problem]

[0021] The invention described in the claims for solving the above problem is characterized in that it maintains the circular shape of a circular spiral ring roughly uniform and enables easy and flexible expansion of the diameter to accommodate various sizes.

[0022] The present invention also relates to a method for installing a spiral ring (retaining ring) that secures a dust boot that protects a ball joint that is widely used in industrial products, including steering devices, suspension devices, and the like that are part of the structure of an automobile or other vehicle.

[0023] As explained above, a spiral ring is different from a typical retaining ring such as a snap ring in that it appears to be a circle without any gaps. Therefore, when it is expanded with a conventional retaining ring tool such as a snap ring pliers, it becomes an ellipse, making it impossible to ensure sufficient clearance for attachment to the target object. Furthermore, the slits at both ends of the spiral ring have a characteristic that a force always acts to return inward.

[0024] In order to expand the diameter of a continuous circle for the purpose of attachment, it is necessary to expand the diameter without changing the circular shape during attachment so that the circle does not become an oval or the like, and it is necessary to ensure a sufficient and minimum clearance so that the ring can be attached to the object. Also, the slits at both ends of the spiral ring always have a force pulling them back inward, and to assist this force, interchangeable force points of multiple shapes may be required to act on the tips of the slits on both rings and to accommodate various sizes of spiral rings.

[0025] The invention described in claim 1, which is intended to solve the above-mentioned problems, is a tool for expanding the diameter of a retaining ring, characterized in that it has a frame of any shape, and is provided with equal force points based on regular polygons such as an equilateral triangle, regular square (diagonal), regular pentagon, or regular octagon, which serve as force points that enable uniform expansion of the diameter of a spiral ring that has a strong circular inward return characteristic, while maintaining its circular shape.The basic structure of the tool is that it has a fixed, linked, partially linked, or independent action function that applies a generally uniform action to the force points, and it suppresses distortion of the spiral ring and ensures a minimum installation clearance.It is also characterized by being able to accommodate various sizes and by making the force point replaceable in anticipation of deformation or damage due to strong force, allowing for generally uniform, easy, and free expansion of the diameter.

[0026] The action force point part of any shape that applies the diameter expanding action described in claim 1 refers to an action force point part that is combined with an action force point of any shape, such as an action force point that draws an arc and acts directly on the ring in accordance with the size of the boot to be attached so that the action force point acts on this tip part, in order to correspond to boots (dust boots) that come in many sizes depending on the manufacturer and the model, and to correspond to the feature that both tip parts of the ring return inward. Also, the shape of the action force point may be a plate shape, a rod shape, or other shape, and is not limited to an arc shape.

[0027] In addition, the arbitrary action function of applying an action to the action force point part described in claim 1 includes an action function including a function of applying an action to the action force point part and a structure having an action force point part that can be replaced, including an air cylinder, an electric motor, a bolt, a rod, a handle, a lever, and a mechanical system operated by hand, for the purpose of uniformly expanding the diameter of the spiral ring, which is impossible by human hands. In addition, this action function is not limited to the above, except for the air cylinder.

[0028] The invention described in claim 2 for solving the above problem is a tool for expanding the diameter of a retaining ring, characterized in that, with respect to the above claim, the tool comprises a frame of any shape, such as a square, circle, or the like, for the purpose of maintaining the circular shape of the retaining ring while expanding its diameter, a bolt that is part of the action function and has a hole that passes through the frame, the hole having a shape that forms a surface in part, and a replaceable action point part that also has a shape that forms a surface in part, for the purpose of fixing the orientation of the tip of the action point at two or more positions where an action is evenly applied to the spiral ring based on a regular polygon, the bolt also has a spring for the purpose of giving an appropriate extension to the bolt extending inward from the frame, and a rotating handle with a screw thread therein for applying manual action to the bolt extending outward from the frame, and the action point part at the tip of the bolt that moves when the handle is rotated enables the spiral ring to be expanded in a generally uniform, easy, and flexible manner.

[0029] The invention described in claim 3 for solving the above problem relates to the above claim, and is an example of a manual diameter expansion method, in which an action rod with a positive and negative thread is provided on an arbitrary frame from the center of its movable range, and both of the action rods are moved outward by applying an action to a rotating handle fixed to the action rod penetrating outside the frame, thereby enabling the spiral ring to be expanded. Also, the tool for expanding the diameter of a retaining ring is characterized in that the inside of the frame is wide in order to easily attach it to the boot, and an auxiliary rod is provided to assist the action rod in consideration of deformation and damage caused by the expansion of the spiral ring, which requires a strong force, thereby enabling the spiral ring to be expanded generally uniformly, easily, and freely.

[0030] The invention described in claim 4 for solving the above problem is a tool for expanding the diameter of a retaining ring, which, with respect to the above claim, has a basic structure of a two-point action by a grip of snap ring pliers used for snap rings that have one shape of a retaining ring, which is a conventional technology, and an arm equipped with an action point part that links to the grip, and the arm is equipped with two or more action point parts, and the arm is equipped with an action point part of any shape that serves as a third action point part, which has a rotating handle with a screw thread that is linked to, partially linked to, or independent of the grip, at any position based on a regular polygon, and by applying an action that is linked to, partially linked to, or independent of both of the action grips, the tool is characterized in that it enables the diameter of a spiral ring to be expanded generally uniformly, easily, and freely.

[0031] The invention described in claim 5 for solving the above problem is a retaining ring diameter expanding tool, characterized in that, regarding the function in the claim, the power source can be selected from mechanical manual power sources such as levers, rotating handles, springs, rubber, wires, gears, etc., air cylinders powered by air compressors that are equipped in automobile repair shops, electric motors using electricity, and hydraulic cylinders using hydraulic pressure, thereby enabling roughly uniform, easy and flexible expansion of the spiral ring. Effect of the Invention

[0032] According to the expanding tool for the retaining ring diameter described in claims 1 to 5, the worker needs to acquire advanced skills and the expanding tool of the conventional technology needs to be for each size, but by providing a tool that allows for roughly uniform, easy and flexible expansion, it is not necessary to acquire advanced skills, and the working time is significantly reduced. Also, compared to the conventional technology that required a single tool for each boot, the tool that allows for flexible expansion makes it possible to significantly reduce the working time with inexpensive capital investment. [Brief description of the drawings]

[0033] [Figure 1]These are front views (the two on the left) showing an example of the basic shape of a typical retaining ring, and front views (the two on the right) showing the basic shape of the spiral ring that is the subject of the present invention and the shape of the slit in the retaining ring that is its characteristic. [Diagram 2] FIG. 2 is a side view showing the basic shape of a ball joint according to the present invention, a spiral ring, and a groove in which the spiral ring is mounted. [Diagram 3] FIG. 1 is a front view showing force points evenly arranged on a circle based on a regular polygon that enables uniform diametric expansion of the spiral ring, which is the basis of the present invention. [Figure 4] FIG. 1 is a front view of a spiral ring that becomes elliptical by expanding its diameter at two points using snap ring pliers according to the prior art. [Diagram 5] FIG. 1 is a front view, a side view, and a cross-sectional view showing one embodiment of an expanding tool having two or more expanding force points using any frame according to the present invention, and showing its structure and the function of fixing the direction of the force point tip in a fixed direction. [Figure 6] FIG. 1 is a front view showing the structure of a spiral ring expanding tool using an arbitrary frame in the present invention, and one embodiment of an expanding tool having two or more expanding action force points and equipped with an air cylinder, an electric motor, a hydraulic cylinder, etc., which act generally in unison with each other, and a front view showing the expanding tool after action. [Figure 7] FIG. 1 is a front view showing a basic structure in which two or more frames are stacked as an example of an arbitrary frame shape in the present invention, and the diameter can be expanded by the rotation action of the grip, which is the function of the stacked frames. [Figure 8a-8d] This is an example of a mechanical spiral ring expanding method using an arbitrary frame in the present invention, and is a side view showing the force point part that moves when a rotational action is applied to an expansion rod having a positive thread and a negative thread from the center of the movable range and having force point parts on both sides, illustrating the basic principle, and a front view showing the state before and after expansion when a frame of an arbitrary shape is equipped with the function. [Figure 9] FIG. 1 is a front view showing the basic structure of the prior art, which requires one tool for each size of spiral ring. [Figures 10a-10c]FIG. 1 is an example of an expanding tool that utilizes the snap ring pliers of the present invention, and is an example of a front view showing the basic structure of a tool that enables an expanding action, and the state before and after the expanding action. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the problems with the prior art will be described with reference to the drawings.

[0035] FIG. 2 shows a boot 2a attached to the ball joint of the present invention for the purpose of protecting the ball joint, and a spiral ring 2 attached to the boot. The boot acts as a protective cover to prevent the ingress of foreign matter and the leakage of the enclosed grease.

[0036] Figure 4 shows the change in shape when spiral ring 2 is expanded using snap ring pliers, a conventional technology that allows the expansion and contraction of snap ring 1, a type of retaining ring. When snap ring pliers are used, spiral ring 3 becomes elliptical as shown in the figure at 4, as a result of the action of snap ring pliers, so sufficient clearance cannot be secured during installation, making it impossible to install it on the boot.

[0037] Figure 9 shows a conventional method for expanding the diameter of a spiral ring. A spiral ring 2 is attached to a metal cone 9a, and then the spiral ring 2 is pushed down to the lowest part of the cone 9c using a driver 9b or an accessory tool, thereby expanding the diameter so that it can be attached to a specific size boot, and this is the tool used for the installation work.

[0038] However, as shown in the figure, the conventional spiral ring expansion tool is a one-point tool whose expansion size corresponds to each individual boot, and a conical metal part 9a for expansion and its lowest part 9c are required for each boot size, and a tool with different diameters for the conical part 9a and the lowest part 9c of the cone is required for each boot size.

[0039] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention that aims to solve the problems associated with the conventional spiral ring diameter expanding method will be described with reference to the drawings.

[0040] FIG. 3 is an example of a spiral ring (retaining ring) 2 with uniform action points based on a regular polygon such as an equilateral triangle or a regular square, which is the basis of the present invention. By applying fixed, interlocking, partially interlocking, or independent actions based on each of these action points, it is possible to expand the diameter of the spiral ring approximately uniformly. As shown in FIG. 3, arranging each action point at each uniform position based on a regular polygon with respect to the inner circle of the spiral ring means, in other words, that when a regular polygon is arranged so that each vertex is in contact with the inner circle of the spiral ring, each action point (action point portion described later) is arranged at each vertex. The action points are arranged so that the intervals between each of the action points are all approximately uniform in the circumferential direction of the inner circle of the spiral ring. Furthermore, with each expanding tool described later, when each action point is moved from the inside to the outside of the spiral ring, the movement amount of each action point can be approximately equal, which enables uniform expansion while maintaining the circular shape of the spiral ring.

[0041] Next, referring to FIG. 5(b), an explanation will be given of the basic expanding tool according to the present invention, which solves the problems of the prior art and enables roughly uniform, easy and flexible expansion as described in the claims.

[0042] Figures 5(b) and 5(a) show an example of a frame of any shape, and this frame 5a is provided with bolts 5c that are part of the action function (action mechanism) equipped with action force points 5b, at evenly spaced positions based on a regular polygon. By manually rotating a rotating handle 5d which has a thread inside and is also part of the action function, the bolts 5c that are part of the action function can be freely moved from the inside of the frame to the outside while being roughly synchronized, making it possible to use one tool to handle boots of various sizes.

[0043] In addition, the structure is characterized in that, for the purpose of maintaining the orientation of the action force point 5b at the tip of the bolt 5c, which is part of the action function, in a constant position, a processing 5g is applied to both the threadless hole 5e that penetrates the frame and the threaded bolt 5c that moves within the hole to create a surface, and by performing the rotation action of the actual threads using a rotating handle 5d on the outside of the frame, a structure is made possible in which the movement of the bolt 5c equipped with the action force point 5b maintains a constant direction that is not affected by rotation.In addition, in order to facilitate the expansion work of the spiral ring and to prevent play and rattling of the bolt 5c, which is part of the action function, a spring 5h is provided to extend the bolt part 5c extending inward from the frame 5a.

[0044] In addition, a force is always acting inward on the slits at both ends of the spiral ring 2 described above, and to assist this force, replaceable force point tips 5i of various sizes and shapes are used so that the force point parts 5b act on the ends of both slits.

[0045] Further, the action force points and action functions are fixed, linked, partially linked or independent action functions, and the action method is not limited thereto.

[0046] 5(a), there are two working force points in terms of structure. However, this is another application of a regular square based on a regular polygon, and does not take into account the deformation of the spiral ring 2 during the diameter expansion, but assumes the post-diameter expansion where the spiral ring 2 can be attached, and enables the spiral ring to be expanded so that it can be attached to the boot 2a by using replaceable working force point tip parts 5i of various shapes, and enables roughly uniform, easy, and free diameter expansion of the spiral ring.

[0047] 6 and 7 show examples of the diameter expanding tool showing various forms with a frame of any shape that enables uniform diameter expansion according to the invention described in claim 1.

[0048] 6 shows an example of a tool based on the basic structure described above, in which a frame 6a of any shape is provided with an action function (action mechanism) 6b having an action force point part 6c, and the action function (action mechanism) 6b uses an air cylinder, an electric motor, a hydraulic cylinder, etc. as its function, and is provided with 6d that adjusts and supplies the power that performs the action to the action function 6b. The power may be built-in or externally supplied, and the shapes and locations of the supply part 6d and the adjustment function (adjustment mechanism) are merely examples and are not limited thereto.

[0049] FIG. 7 shows a spiral ring expansion tool, the basic structure of which is that two or more frames 7a, each equipped with a lever 7b, are stacked on top of each other, and the force acting on the acting force point 7c is applied by the rotational action caused by the gripping force of both levers 7b held by hand.

[0050] 8a to 8d are an example of the diameter expansion method of the present invention using an arbitrary frame. An arbitrary frame shape 8a has an action rod 8e with a positive thread and a negative thread 8c at its movable range center 8b, and both of the action rods 8e are provided with action force points 8d from their movable range center 8b. The basic principle is that both of the action force points 8d of the action rods 8e move outward by applying an action to a rotating handle 8f fixed to the action rod 8e penetrating the outside of the frame 8a. In addition, the inner center of the frame 8a is secured widely for the purpose of easy attachment to the boot 2a. In consideration of deformation and damage caused by the diameter expansion of the spiral ring 2, which requires a strong force, an auxiliary rod 8g is provided to assist the action rod 8e, thereby suppressing damage and deformation of the action force points 8d and other parts, and enabling the spiral ring to be expanded generally uniformly, easily, and freely. This is an example of the tool for expanding the diameter of a retaining ring according to claims 1 and 2, characterized in that the tool is characterized in that the inner center of the frame 8a is secured widely for the purpose of easy attachment to the boot 2a. In addition, in consideration of deformation and damage caused by the diameter expansion of the spiral ring 2, which requires a strong force, an auxiliary rod 8g is provided to assist the action rod 8e, thereby suppressing damage and deformation of the action force points 8d and other parts, and enabling the spiral ring to be expanded generally uniformly, easily, and freely.

[0051] Figures 10a to 10c show, as an example, a two-point action structure based on a snap ring pliers used for expanding and contracting the diameter of a snap ring 1, which is one type of retaining ring, which is a conventional technology, with a pliers grip 10d and an arm 10c having an action point portion 10a linked thereto, and two or more action point portions 10a of any shape are provided on the arm 10c, and a screw thread 10i is provided at any position based on a regular polygon, which is linked to, partially linked to, or independent of the grip 10d, and an action rod 10e is provided with an action point portion of any shape that serves as a third action point portion having a rotating handle 10j, and an action is applied which is linked to, partially linked to, or independent of the grip 10d, thereby enabling the spiral ring to be expanded in a generally uniform, easy, and flexible manner. Further, the screw thread 10i and the rotating handle 10j provided on the action rod relay portion 10f that relays the action rod 10e may or may not be provided, and are not limited thereto.

[0052] Fig. 6 shows the function of the claimed action, characterized in that it is equipped with an external supply unit 6d that supplies and adjusts power outside the tool and transmits it to the action function, as an example of a power supply method for an air cylinder using an air compressor that is equipped in an automobile repair shop, an electric motor, a hydraulic cylinder, etc. The power and adjustment function may be built-in or external, and the shape and location of the supply unit 6d are merely examples and are not limited. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. EXAMPLES

[0053] Fig. 5(b) shows a representative embodiment of the present invention. First, the spiral ring 2 is held by adjusting each rotating handle 5d so that it does not fall off the tip 5b of the force point for expanding the diameter of the spiral ring 2 held at the tip 5b of the force point. Next, by manually rotating each rotating handle 5d in order to expand the diameter of the spiral ring 2 held at the tip 5b of the force point, the bolt 5c, which is part of the function, moves freely to the outside of the frame, making it possible to expand the diameter of the spiral ring roughly uniformly, easily, and freely. EXAMPLES

[0054] FIG. 6 shows an example of the present invention, in which the spiral ring 2 is provided at the action force point 6c as in the first embodiment to prevent it from falling off, and electricity, hydraulic pressure, and other power sources with separate adjustment functions are supplied to the action function 6b provided on any frame 6a via 6d, and the action of the separate adjustment functions on the action function 6b enables the spiral ring to be expanded in diameter generally uniformly, easily, and freely. EXAMPLES

[0055] 10a to 10c show an example of the present invention, which applies a conventional snap ring pliers used for a snap ring 1, which is a type of retaining ring.

[0056] First, the spiral ring 2 is held at 10a 10b, which is the action force point, so as not to fall off, as in the first embodiment. Next, the gripping force is applied to the arm 10c linked to the grip 10d. Here, the gripping force is applied to the rotating handle 10j provided on the action rod 10e, which is provided with the action force point 10b, which is optionally linked, partially linked, or independent, by 10g 10h 0i, which is a part of the action function linked in parallel or partially linked. The gripping force applied to the grip 10d and the rotating handle 10j provided on the action rod 10e are performed in parallel, partially parallel, or independently, thereby enabling the spiral ring to be expanded in a generally uniform and free manner. [Explanation of symbols]

[0057] 1. Snap ring, a type of retaining ring 2 Spiral ring, a type of retaining ring 2a Dust boots for ball joints 3 Shape of the spiral ring before expanding it with snap ring pliers 4. Shape of the spiral ring after expanding it with snap ring pliers 5a Frame of any shape 5b Force point of any shape 5c Arbitrary Shape Action Function 5d Rotation handle of any shape 5e Hole through a frame with a surface of any shape 5f Cross-sectional view of a bolt with a surface that is part of the function Some surface shapes in 5g 5e5f 5h Spring 5i Tip of force point 6a Frame of any shape 6b Arbitrary Shape Action Function 6c Force point of any shape 6d Power supply for any type of function 7a Frames of arbitrary shapes that overlap each other 7b Lever on each of overlapping frames of any shape 7c Arbitrary Shape Action Function 8a Frame of any shape 8b Center of the action rod range of motion 8c Positive and negative threads on the action rod 8d. Action point provided on action rod 8e Action Rod 8f Rotating handle acting on the action rod 8g Auxiliary Rod 9a Metal part of a cone that is expanded by conventional technology 9b A flathead screwdriver that uses a conical metal to expand the diameter in the prior art 9c Part where the expansion size determined by the conventional technology is determined 10a Arm acting force point 10b Action rod action force point part 10c Working arm 10d Action Grip 10e Action Rod 10f Working rod relay part 10g Action rod side grip linkage point 10h Grip side action rod linkage point 10i Threads on the action rod 10j Action rod rotation action handle

Claims

[Claim 1] This is a tool for expanding the diameter of retaining rings. A frame surrounding the retaining ring is provided, the frame includes a partially threaded hole extending through the frame at each of two or more positions where the retaining ring acts, and a partially threaded bolt moving through the hole; a force point portion at the tip of the bolt, a spring on the bolt extending inward from the frame, and a rotating handle having a thread on the bolt extending outward from the frame; The force point portions are disposed at equal intervals in a circumferential direction on the frame and are attached to the retaining ring. a surface of the hole and a surface of the bolt position the bolt against rotation; This retaining ring diameter expanding tool is characterized in that, by rotating the rotating handle, the bolt moves outward without rotating, and the force point portion at the tip of the bolt also moves outward, thereby expanding the diameter of the retaining ring.

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