JP2019119044A - E-shaped snap ring extraction tool - Google Patents

Abstract

To provide an E-shaped snap ring extraction tool that enables a series of operations for extracting an E-shaped snap ring to be stably performed to reduce a load on a user.SOLUTION: An E-shaped snap ring extraction tool 100 according to the present invention is for extracting an E-shaped snap ring in a radial direction with respect to a shaft to which the E-shaped snap ring is inserted. The E-shaped snap ring extraction tool comprises: a grip member 110 having, at one end side, a pair of bifurcated shaft guide portions 112 that can be loosely inserted to a shaft, and at the other end side, a grip portion 111; an extraction piece 140 that is connected to the shaft guide portions 112 and has, at a pair of bifurcated tips, hook portions 144 for hooking ends of the E-shaped snap ring; and an abutment part 154 that is slidably engaged with the grip member 110 and abuts on the shaft. The abutment part 154 comprises a slide member 150 that slides along the bifurcated shaft guide portions 112.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an E-shaped snap ring removal tool.

  When removing the E-shaped retaining ring inserted in the shaft, insert the tip of a tool such as a flat-blade screwdriver or a pliers into the gap between the shaft and the E-shaped retaining ring, and remove the inserted tool by twisting etc. It has become a target. However, such a withdrawal method is difficult because the operation is not stable, and it may be scattered or dropped when the E-shaped retaining ring is deviated from the shaft.

  Therefore, a tool for removing the E-shaped retaining ring has been proposed. For example, the tool described in Patent Document 1 has a pin-like shape, and a U-shaped groove is formed at the tip of the upper arm of the upper and lower pinch arms, and elasticity is provided in the groove. It has a pressing member. Such a tool is adapted to hold the E-shaped retaining ring by means of the groove when a part of the E-shaped retaining ring is inserted into the groove.

  Moreover, the tool described in patent document 2 is provided with the through-hole of the retaining ring at one end. The through holes are provided with extrusions that respectively abut on both ends of the retaining ring and press the both ends to remove the retaining ring from the shaft. In addition, a permanent magnet is provided at one end, which is attracted before scattering the retaining ring off axis.

JP 2007-038324 A JP-A-8-118253

  However, the tool according to Patent Document 1 is inserted into the gap between the shaft and the E-shaped retaining ring to force the user to twist the inserted tool, which makes stable work difficult. In addition, the tool according to Patent Document 2 must apply a strong force to the E-shaped retaining ring inserted in the shaft.

  The present invention has been made to solve such a problem, and can stably carry out a series of operations for removing the E-shaped retaining ring from the shaft, reducing the load on the user of the tool. It is an object of the present invention to provide an E-shaped snap ring removal tool.

  The E-shaped snap ring extraction tool according to the present invention is an E-shaped snap ring extraction tool for extracting an E-shaped snap ring from a radial direction with respect to an axis into which the E-shaped snap ring is inserted. A pair of shaft guide portions bifurcated into two for free insertion with respect to the shaft, and a grip member having a grip portion on the other end side, and a pair of bifurcated tips connected with the shaft guide portion It has a removal piece having a collar portion for hooking the end portion of the E-shaped snap ring, and an abutment portion slidably engaged with the gripping member and abutting on the shaft, the abutment portion being the bifurcated portion And a slide member displaced along the gap of the shaft guide portion branched into two.

  With such a configuration, the E-shaped snap ring removal tool brings the end portion of the E-shaped snap ring hooked by bringing the contact portion of the slide portion into contact with the shaft and displacing the slide member. Pulls out the E-shaped retaining ring. Thereby, the E-shaped snap ring removing tool can stably perform the work of removing the E-shaped snap ring.

  The slide member may have a slide shaft for holding the E-shaped snap ring removed from the shaft in the radial direction with the pair of collars. Thereby, the E-shaped snap ring removing tool can hold the removed E-shaped snap ring.

  Moreover, the said collar part may each have a 1st holding part holding the axial direction of E-shaped retaining ring. In addition, the slide member may have a second holding portion that holds the axial direction of the E-shaped retaining ring. Thereby, the E-shaped snap ring removal tool can hold the E-shaped snap ring in the axial direction, and can perform a series of operations stably.

  Further, the removal piece is a flat member, the first main surface is in contact with the holding member, and the first holding portion is provided so as not to protrude from the second main surface of the removal piece. It is also good. Further, the removal piece is a flat member, the first main surface is in contact with the holding member, and the second holding portion is provided so as not to protrude from the second main surface of the removal piece. It is also good. Thereby, the E-shaped snap ring removal tool can improve the degree of freedom of operation.

  Further, the shaft guide portion may extend inward from the outer diameter of the E-shaped snap ring in a state of holding the E-shaped snap ring removed from the shaft. Thereby, drop-off of the removed E-shaped retaining ring can be suppressed.

  In addition, the E-shaped snap ring removal tool may further include an elastic body that biases the flange portion of the removal piece and the contact portion of the slide member apart from each other. This can reduce the burden on the user.

  The E-shaped snap ring removal tool may further include an operating member that has an operating portion, is slidably engaged with the holding member, and is interlocked with the slide member. Further, the holding member and the operation member are pivotally supported to each other so as to slide the holding portion and the operation portion so as to be close to each other. The contact portions may be close to each other. Thereby, the burden on the user can be reduced and stable work can be performed.

  The E-shaped snap ring removal tool has one end engaged with the operation member and the other end engaged with the slide member sliding in the linear movement direction, and the displacement of the operation member in the rotational direction and the slide member It may further have a connecting member that converts the displacement in the linear movement direction. Thereby, the E-shaped snap ring removing tool can efficiently remove the E-shaped snap ring.

  Further, in the E-shaped snap ring removal tool, the slide member further has an escape hole for loosely fitting on a collar slide shaft erected on the extraction piece, and a stopper provided in a convex shape in the escape hole. It is also good. In this case, when the E-shaped snap ring removal tool is operated, the stopper contacts the contact when at least one of the flanges is displaced along the outer diameter of the E-shaped snap ring. Before the distance between the portion and the buttocks reaches half the outer diameter of the shaft, the abutment of the buttocks on the buttocks slide shaft prevents the buttocks and the abutment from approaching each other. preferable. Thereby, the E-shaped snap ring removal tool can suppress the breakage and the like of the E-shaped snap ring removal tool in a state where the E-shaped snap ring is not properly mounted.

  In the present specification, the “E-shaped retaining ring” is a metal plate having a hollow disk shape and an opening, and the metal plate from the radial direction of the axis with respect to the axis having a circumferential groove It is a retaining ring which is inserted in such a way as to expand the opening of the opening within the elastic range.

According to the present invention, it is possible to stably carry out a series of operations for removing the E-shaped snap ring from the shaft, and to provide an E-shaped snap ring removal tool which reduces the load on the user who uses the tool.

FIG. 1 is a schematic view of an E-shaped snap ring removal tool 100 according to a first embodiment. FIG. 1 is an exploded perspective view of an E-shaped snap ring removal tool 100 according to a first embodiment. FIG. 6 is a view for explaining the structure of the tip portion of the E-shaped snap ring removal tool 100 according to the first embodiment. FIG. 2 is a view showing a state in which the E-shaped snap ring removal tool 100 according to the first embodiment is attached to a shaft. It is a figure of the state where the slide member of E type snap ring removal tool 100 with which the axis was attached abuts on an axis. It is a figure which shows the state in the middle of E-shaped retaining ring extraction tool 100 removing an E-shaped retaining ring. It is a figure which shows the state which E type snap ring removal tool 100 completed extraction of E type snap ring. It is a figure which shows the state holding E-shaped retaining ring which E-shaped retaining ring removal tool 100 removed. It is a figure which shows the operation | movement which releases the E-shaped retaining ring which E-shaped retaining ring removal tool 100 removed. FIG. 10 is a schematic view of an E-shaped snap ring removal tool 200 according to a second embodiment. FIG. 10 is an exploded perspective view of an E-shaped retaining ring removing tool 200 according to a second embodiment. It is the figure which showed the shape of the relief hole of the slide member which the E-shaped retaining ring extraction tool concerning Embodiment 3 has. It is a figure which shows an example of the use condition which is not normal of the E-shaped retaining ring extraction tool concerning Embodiment 3. FIG. FIG. 18 is a view showing an example of a normal use state of the E-shaped snap ring removal tool according to the third embodiment.

  Embodiments will be described below with reference to the drawings. In the following description and the drawings, the same reference numerals are given to configurations common to a plurality of drawings. Therefore, the description of the components denoted by the same reference numerals will be omitted as appropriate.

  Also, in the following description, the axial direction indicates a direction parallel to the extension direction of the axis into which the E-shaped retaining ring is to be inserted. The radial direction indicates a direction perpendicular to the axial direction of the axis and extending radially from the axis.

Embodiment 1
First, an outline of the E-shaped snap ring removing tool according to the first embodiment will be described with reference to FIG. FIG. 1 is a schematic view of an E-shaped snap ring removal tool 100 according to a first embodiment. The E-type snap ring removal tool 100 is an E-type snap ring removal tool for removing the E-type snap ring from the radial direction with respect to the axis in which the E-type snap ring is inserted. The E-shaped snap ring removal tool 100 mainly has a grip member 110, an operation lever 120, a connection member 130, a removal piece 140, and a slide member 150.

  The holding member 110 is a long member, and has a pair of shaft guide portions 112 bifurcated into one end so as to be loosely inserted into the shaft at one end side. In addition, the gripping member 110 has a removal piece 140 on one main surface on the one end side, and is engaged with the slide member 150 on the other main surface. The gripping member 110 has a gripping portion 111 at the other end side opposite to the one end side. In addition, the gripping member 110 has a first shaft 161 at an intermediate portion.

  The control lever 120 is slidably engaged with the gripping member 110. The user operates the E-shaped snap ring removal tool 100 by sliding so as to change the relative positional relationship between the control lever 120 and the gripping member 110. One end side of the operation lever 120 is pivotally supported by the first shaft 161 at an intermediate portion of the gripping member 110. The operating lever 120 has an operating portion 121 on the other end side. The operation unit 121 is set to turn the range of the predetermined angle X with the first shaft 161 as a fulcrum. The user changes the angle X formed by the gripping member 110 and the control lever 120 in the operation of the E-shaped snap ring removal tool 100. The angle X is, for example, 0 degrees to 30 degrees. It is preferable that the holding part 111 and the operation part 121 have a length easy for the user to operate. Thus, the control lever 120 of the E-shaped snap ring removal tool 100 extends away from the tip end side of the E-shaped snap ring removal tool 100 starting from the vicinity of the first shaft 161 which is a pivot point.

  The removal piece 140 is in contact with the main surface of the gripping member 110 and engaged so that the longitudinal direction of the removal piece 140 and the longitudinal direction of the gripping member 110 coincide with each other.

  The slide member 150 is in contact with the main surface opposite to the surface that the removal piece 140 contacts, and is slidably engaged in parallel with the longitudinal direction of the grip member 110.

  The connecting member 130 is pivotally supported by the second shaft 162 at one end thereof so as to be rotatable with the operation lever 120. The connecting member 130 is pivotally supported by the third shaft 163 on the other end side of the connecting member 130 so as to be rotatable.

  With the above-described configuration, the E-shaped snap ring removal tool 100 can operate as follows. The operation lever 120 pivots in a direction A1 in which the tip end 111e of the grip 111 and the tip end 121e of the operation portion 121 approach each other. When the control lever 120 pivots in the direction A 1, the connection member 130 transmits the displacement of the control lever 120 to the slide member 150. Thereby, the slide member 150 is displaced in the direction B1 parallel to the longitudinal direction of the grip member 110 and approaching the axis guide portion 112. That is, the connection member 130 converts the displacement in the rotational direction of the operation lever 120 which is the operation member and the displacement in the linear movement direction of the slide member 150.

  On the other hand, the E-shaped snap ring removal tool 100 can also operate as follows. The control lever 120 pivots in a direction A2 in which the tip end 111e of the grip 111 and the tip end 121e of the operation portion 121 are separated from each other. When the control lever 120 pivots in the direction A 2, the connection member 130 transmits the displacement of the control lever 120 to the slide member 150. Thereby, the slide member 150 is displaced in the direction B2 parallel to the longitudinal direction of the grip member 110 and away from the axis guide portion 112.

  Next, details of each configuration of the E-shaped snap ring removal tool 100 will be described with reference to FIG. FIG. 2 is an exploded perspective view of the E-shaped snap ring removal tool 100 according to the first embodiment. The details of each part will be described below.

  First, the details of the gripping member 110 will be described. The holding member 110 is a long member, and is formed by press-forming a metal plate. The material of the metal plate is, for example, iron or stainless steel containing iron as a main component. The gripping member 110 includes a gripping portion 111, a shaft guide portion 112, a relief hole 113, a guide groove 114, a guide hole 115, a sixth hole 186, a first shaft 161, and a fifth shaft 165.

  The gripping portion 111 is a portion gripped when the user operates the E-shaped snap ring removal tool 100, and is provided at one end of the gripping member 110. The grip portion 111 is covered with, for example, resin, rubber, or an elastomer.

  The shaft guide portion 112 serves as a guide when inserting the tip portion of the E-shaped snap ring removal tool 100 with respect to the axis into which the E-shaped snap ring is inserted. The shaft guide portion 112 has a pair of bifurcated shapes that can be loosely inserted into the shaft. The shaft guide portion 112 is provided at the end opposite to the grip portion 111, and maintains the predetermined distance larger by about 5 percent than the diameter of the shaft to be operated with respect to the longitudinal direction of the grip member 110. Extend parallel. As a result, the axis guide portion 112 can insert the axis that is the work object, and can easily release the axis.

  The relief holes 113 are holes provided in the vicinity of the pair of shaft guide portions 112, respectively. The seventh shaft 167 fitted in the removal piece 140 is inserted through the relief hole 113, and the seventh shaft 167 is loosely fitted in the relief hole 113.

  The guide groove 114 is a groove for guiding the slide shaft 156 of the slide member 150 in the longitudinal direction of the grip member 110. The guide groove 114 is a groove provided on the root side of the shaft guide portion 112, and the groove extends in the longitudinal direction of the gripping member 110 so as to guide the slide shaft 156. The diameter of the slide shaft 156 is set to be smaller than the diameter of the shaft to be worked. That is, the tip end portion of the gripping member 110 extends in parallel with a width that allows the pair of axis guide portions 112 to loosely fit the axis of the operation target. The distal end portion has a width narrower than the width of the shaft guide portion 112 from the root of the shaft guide portion 112 and has a shape in which a groove having a width substantially the same as the width of the slide shaft 156 further extends.

  The guide hole 115 has an elongated hole shape extending in the longitudinal direction of the gripping member 110, and the third shaft 163 of the connecting member 130 is linearly engaged. The third hole 183 of the spacer 135 is inserted through the third shaft 163 engaged with the guide hole 115. The third shaft 163 has a hollow hole 184, and the fourth shaft 164 of the slide member 150 is rotatably engaged with the hollow hole 184. That is, the third shaft 163 of the connecting member 130 and the fourth shaft 164 of the slide member 150 are connected, and the guide hole 115 guides such connected members to move linearly. Further, the guide groove 114 and the guide hole 115 extend in parallel. Thereby, the slide member 150 can slide in parallel in the longitudinal direction of the grip member 110 without rattling.

  The spacer 135 is for maintaining a gap corresponding to the thickness of the operation lever 120 generated between the connecting member 130 and the gripping member 110 without rattling, and instead of the spacer 135, a step is formed on the third shaft 163. A spacer may be provided upright on the gripping member 110. Also, the connection member 130 may be subjected to a step bending process, or other means that can be conceived by those skilled in the art may be adopted.

  The sixth shaft 166 is fitted into the sixth hole 186. The sixth shaft 166 engages with the hook of the coil spring 199. The sixth shaft 166 may be formed separately as shown in FIG. 2 and then fitted in the sixth hole 186, or may be erected as an integrated shaft by molding the gripping member 110. It may be done.

  The first shaft 161 is a shaft erected at the central portion of the gripping member 110 and engaged with the first hole 181 of the operation lever 120.

  Next, details of the operation lever 120 will be described. The control lever 120 is a plate-like member having an L-shape whose main surface is a short portion and a long portion. Of the two arms extending in an L shape, a second hole 182 is drilled in the vicinity of the end of the short part relatively short with respect to the long part, and in the bent part between the short part and the long part The first hole 181 is bored. In addition, on the long part side near the first hole 181, the step bending process is performed so as to coincide with the gripping member 110 in the thickness direction, and the operation part 121 is formed from the vicinity of the step bending process to the tip of the long part ing. The control lever 120 is formed by press forming a metal plate.

  The operation unit 121 is a portion held by the user when operating the E-shaped snap ring removal tool 100. The operation unit 121 is covered with, for example, a resin, a rubber, or an elastomer. The first hole 181 is rotatably engaged with the first shaft 161 of the gripping member 110, and serves as a fulcrum when the operation lever 120 rotates. The second hole 182 rotatably engages with the second shaft 162 of the connecting member 130.

  Here, the position of the second hole 182 will be described. As described with reference to FIG. 1, in the operation lever 120, the operation portion 121 approaches or separates from the grip portion 111 (direction A1) with the first hole 181 engaged with the first shaft 161 as a fulcrum (direction A2) To rotate. The second hole 182 rotates in a direction (direction B1) approaching the axis guide portion 112 when the operation portion 121 approaches the grip portion 111 (direction A1), and the operation portion 121 separates from the grip portion 111 (direction A2) In addition, it is provided to rotate in a direction (direction B2) away from the shaft guide portion 112. As a result, when the user operates the gripping portion 111 and the operation portion 121 to approach each other, the slide member 150 moves in the direction approaching the shaft guide portion 112 via the connecting member 130 connected to the second hole 182. Displace. Note that the displacement trajectory of the second hole 182 is along the longitudinal direction of the gripping member 110 in order to efficiently convert the directions A1 and A2 pivoting about the first shaft 161 into the directions B1 and B2 for linear motion. It is preferable to set as follows.

  Next, details of the connecting member 130 will be described. The connecting member 130 is an elongated metal member, has a second shaft 162 at one end, and has a third shaft 163 at the other end. The second shaft 162 is rotatably engaged with the second hole 182 of the control lever 120. The third shaft 163 is inserted into the third hole 183 of the spacer 135 and the guide hole 115 of the grip member 110, and is rotatably engaged with the fourth shaft 164 of the slide member 150.

  Next, the details of the removal piece 140 will be described. The removal piece 140 is a long metal member engaged with the main surface of the gripping member 110. The metal material which comprises the removal piece 140 has elasticity, for example, is stainless steel which has iron or iron as a main component. The extraction piece 140 has a fifth hole 185, an arm portion 142, a seventh hole 187, a snap ring loose fitting portion 143, and a collar portion 144. The tip of the extraction piece 140 is bifurcated, and a collar portion 144 for hooking the end of the E-shaped snap ring is provided at each of the branched tip ends.

  In the vicinity of the pair of collar portions 144, a snap ring loose fitting portion 143 to which the E-shaped snap ring is loosely fitted is provided. The retaining ring loose fitting portion 143 is formed such that circular notch shapes face each other. The E-shaped retaining ring is loosely fitted to the retaining ring loose fitting portion 143 when the E-shaped retaining ring to be removed is removed.

  Seventh holes 187 are respectively bored in the vicinity of the pair of snap ring loose fitting portions 143, and a seventh shaft 167 is fitted in each of the seventh holes 187. The seventh shaft is inserted so as to be loosely fitted in the relief hole 113 of the gripping member 110 and the relief hole 153 of the slide member 150, and has a flange portion at its tip. Since the seventh shaft 167 has a flange at its tip, the flange and the removal piece 140 sandwich the gripping member 110 and the slide member 150. Therefore, the gripping member 110 and the removal piece 140 are maintained in contact with each other, and similarly, the gripping member 110 and the slide member 150 are maintained in contact with each other.

  The arm portion 142 bifurcates from the vicinity of the fifth hole 185 and extends in parallel in the longitudinal direction toward the tip of the removal piece 140. The tip from which the arm portion 142 extends is the tip of the extraction piece 140, and the tip has a hook portion 144, a snap ring loose fitting portion 143, and a seventh hole 187. The arm portion 142 is curved in a direction away from each other when the pair of collar portions 144 pulls out the E-shaped retaining ring from the shaft, and after the collar portion 144 is pulled out of the shaft from the E-shaped retaining ring It has a degree of resilience to restore to

  The fifth hole 185 is fitted to the fifth shaft 165 of the gripping member 110.

  Next, the details of the slide member 150 will be described. The slide member 150 is an elongated metal member, interlocked with the operation lever 120 via the connection member 130, slides in the longitudinal direction of the grip member 110, and abuts on the shaft into which the E-shaped snap ring is inserted. It has a function. In the slide member 150, the main surface of the slide member 150 and the main surface of the grip member 110 are in contact with each other. The slide member 150 is slidably engaged with the gripping member 110 and displaced in parallel to the longitudinal direction of the gripping member 110. The slide member 150 has an abutment portion 154, an escape hole 153, a slide shaft 156, a fourth shaft 164, and a fifth shaft 165.

  The contact portion 154 has a function of contacting the shaft on which the E-shaped snap ring is mounted at the tip of the slide member 150. The contact portion 154 is provided so that a surface perpendicular to the longitudinal direction of the slide member 150 stands on the surface on the side in contact with the gripping member 110 on the tip end side of the slide member 150.

  The relief hole 153 is a hole through which the seventh shaft 167 is inserted. The relief holes 153 are substantially rectangular holes, and are sized so as not to prevent the movement of the seventh shafts 167 toward and away from each other and to prevent the slide member 150 from sliding. Further, the relief hole 153 is in contact with the flange of the seventh shaft 167 so that the respective constituent members at the tip of the E-shaped snap ring removal tool 100 operate without rattling in the thickness direction.

  The slide shaft 156 holds the E-shaped retaining ring by coming into contact with the outer peripheral portion of the E-shaped retaining ring when removing the E-shaped retaining ring. The slide shaft 156 is erected from the main surface of the slide member 150 in contact with the gripping member 110, and the root side is slidably engaged with the guide groove 114. Further, the slide shaft 156 has a second holding portion 155 at the top. The second holding portion 155 is formed in a hook shape at the tip of the slide shaft 156 and extends to the tip side of the gripping member 110. The second holding portion 155 has a function of holding the E-shaped retaining ring in order to prevent the removed E-shaped retaining ring from being unintentionally dropped from the E-shaped retaining ring removal tool 100.

  The fourth shaft 164 protrudes to the side of the gripping member 110, and is rotatably engaged with the third shaft 163 of the connecting member 130. The fifth shaft 165 is a shaft erected on the surface opposite to the surface in contact with the gripping member 110, and serves as a hook of the coil spring 199. The fourth shaft 164 and the fifth shaft 165 may be an integral shaft.

  The E-shaped snap ring removal tool 100 has a coil spring 199. One of the coil springs 199 is engaged with the sixth shaft 166 of the gripping member 110, and the other is engaged with the fifth shaft 165 of the slide member 150. The coil spring 199 is a tension coil spring, and biases the fifth shaft 165 and the sixth shaft 166 so as to approach each other. In other words, the coil spring 199 biases the contact portion 154 away from the tip of the gripping member 110. Alternatively, the coil spring 199 biases the grip portion 111 and the operation portion 121 away from each other.

  Next, with reference to FIGS. 3 to 9, an operation of removing the E-shaped retaining ring 800 from the shaft 900 which is the operation target of the E-shaped retaining ring removing tool 100 will be described. Among the operations described below, the operation for changing the relative position between the shaft 900 and the E-shaped snap ring removal tool 100 causes the shaft 900 to stand still and the E-shaped snap ring removal tool 100 to be displaced. Described in

  First, the configuration of the tip portion of the E-shaped snap ring removal tool 100 will be described with reference to FIG. FIG. 3 is a view for explaining the structure of the tip portion of the E-shaped snap ring removal tool 100 according to the first embodiment. FIG. 3 shows a part of the configuration transparently for easy understanding.

  Note that the drawings shown below appropriately show right-handed xyz coordinates. These right-handed xyz coordinates are convenient for describing the positional relationship of components. For example, the z-axis direction in FIG. 3 coincides with the z-axis direction in the right-handed coordinate shown in FIG.

  In FIG. 3, the E-shaped snap ring removal tool 100 has the removal piece 140, the gripping member 110, and the slide member 150 overlapping in the negative direction from the z-axis positive direction. Further, in FIG. 3, the E-shaped snap ring removal tool 100 does not sandwich the E-shaped snap ring, and is in a state of not receiving an external force.

  Hereinafter, the tip portion of the removal piece 140 will be described in detail. At the tip end of the removal piece 140, the pair of arms 142 extend in the positive direction from the y-axis minus direction, the surface of the extended arm gradually expands, and the seventh shaft 167 is erected on the expanded surface ing.

  The pair of seventh shafts 167 fitted to the removal piece 140 is displaced in the direction F1 together with the collar portion 144. The seventh shaft 167 has a gap w31 and the end of the loosely fitted escape hole 113, respectively. Therefore, the seventh axis 167 is displaceable in the range of the distance w31.

  Further, the tip end portion of the removal piece 140 has a snap ring loose fitting portion 143 on the tip end side further from the seventh shaft 167. The pair of snap ring loose fitting portions 143 are formed so that circular notch shapes face each other and follow the circular shape of diameter D3. The diameter D3 is, for example, about 10 percent larger than the diameter D2 of the E-shaped retaining ring 800.

  The tip end portion of the removal piece 140 approaches the predetermined position while the tip end side of the snap ring loose fitting portion 143 follows the circular shape of the diameter D3, and further has a collar portion 144 on the tip end side. The collar portion 144 has a collar end 144a that abuts on the end of the E-shaped retaining ring 800 on the y-axis negative direction side. The wedge end portion 144a has a linear portion in the x-axis direction so that it can abut on the end portion of the E-shaped retaining ring 800 with a predetermined width.

  In addition, the main surface on the z-axis plus side of the removal piece 140 at the position of the heel end portion 144a has a first holding portion 145 in the form of a bowl. The first holding portion 145 holds the E-shaped retaining ring 800 in the axial direction when the E-shaped retaining ring 800 is in contact with the heel end portion 144a.

  The pair of collars 144 extend toward the tip end while drawing a curve from the straight line portion of the collar end 144a, and when approaching the distance w11, it has a shape gradually expanding away from each other. Due to such a shape, the collar portion 144 is less likely to damage the shaft when the shaft to be worked comes in contact, and is easy to insert with the tip portion as the shaft.

  When an external force is applied in the direction F1 to the pair of collars 144 of the removal piece 140, the arm 142 is bent and deformed. Due to the deformation of the arm portion 142, the pair of collar portions 144 are configured to expand in the direction F1 so as to be separated from each other. Further, when released from the external force in the direction F1, the pair of collars 144 is configured to be restored to the original shape by the restoring force of the arm portion 142.

  Next, the tip end of the gripping member 110 will be described. As shown in FIG. 3, a guide groove 114 for guiding the slide shaft 156 is extended from the y-axis negative direction side toward the positive direction side at the central portion in the lateral direction of the gripping member 110. The guide groove 114 has a linear portion of at least a length w41 and guides the slide shaft 156 in the range of the length w41.

  In the vicinity of the guide groove 114, a pair of clearance holes 113 for loosely fitting the pair of seventh shafts 167 are provided so as to straddle the guide groove 114. The relief hole 113 has an elongated hole shape extending in the x-axis direction, and has a distance w31 from the seventh axis 167.

  The tip end portion of the guide groove 114 is opened at the tip end side of the area for guiding the slide shaft 156, and has an axis guide portion 112 at the tip of the opening. The pair of axis guide portions 112 extend in parallel in the y-axis plus direction while maintaining the distance w21. The distance w21 is set to be, for example, about 5 percent larger than the diameter D2 of the shaft 900. Therefore, the pair of shaft guides 112 can loosely fit the shaft 900 in such a gap. The tip end portion of the shaft guide portion 112 gradually expands from the distance w21 and is formed to draw a curve. Therefore, the tip of the shaft guide portion 112 is less likely to damage the shaft 900 when in contact with the shaft.

  Next, the tip of the slide member 150 will be described. The slide member 150 has a slide shaft 156, and the slide shaft 156 is engaged with the guide groove 114. Thus, the slide shaft 156 can move linearly in the range of the length w41 in the y-axis direction. The slide shaft 156 has a bowl-shaped second holding portion 155 at the top (z-axis positive direction side). The second holding portion 155 has a function of holding the axial direction of the E-shaped retaining ring 800.

  The slide member 150 has, near the slide shaft 156, a pair of relief holes 153 in which the pair of seventh shafts 167 are loosely fitted. The relief hole 153 has a size that does not prevent the movement of the seventh shaft 167 in the x-axis direction. Therefore, the seventh shaft 167 and the clearance hole 153 have a distance w31 in the x-axis direction. On the other hand, the relief hole 153 has a size that does not prevent the movement of the slide shaft 156 in the y-axis direction. Therefore, the seventh shaft 167 and the relief hole 153 have a gap w41.

  The slide member 150 has an abutment portion 154 at its tip. The abutment portion 154 is located between the pair of shaft guide portions 112 so as to abut on the shaft 900 and is displaced along the gap between the shaft guide portions 112. The slide member 150 is biased by a coil spring 199 in the negative y-axis direction (direction F3). Further, the slide member 150 has a structure capable of being displaced in the y-axis plus direction (direction F2) against the biasing force of the coil spring 199.

  Next, the E-shaped retaining ring 800 will be described. The E-shaped retaining ring 800 is a metal plate which is hollow disc-shaped and has an opening 800a. Each of the E-shaped retaining rings 800 has a pair of end portions 800 b forming an opening 800 a. The E-shaped retaining ring 800 is inserted to the shaft having the circumferential groove so as to push out the opening 800a in the elastic range from the radial direction of the shaft. The E-shaped retaining ring 800 is removed while being deformed so as to expand the opening 800 a in the radial direction of the shaft. The extracted E-shaped retaining ring 800 may be plastically deformed when it is deformed so as to expand the opening 800 a. Therefore, the plastically deformed E-shaped retaining ring is not reused when it is removed.

  Based on the structure of the E-shaped snap ring removal tool 100 described above, the operation of removing the E-shaped snap ring 800 inserted in the shaft 900 will be described hereinafter.

  When removing the E-shaped snap ring 800 from the shaft 900, the user inserts the tip of the E-shaped snap ring removal tool 100 into the shaft 900. First, the user inserts the tip of the E-shaped snap ring removal tool 100 into the shaft 900 on the z-axis negative side of the E-shaped snap ring 800.

  The distance w11 between the tips of the removal pieces 140 is smaller than the outer diameter D1 of the shaft 900. However, the collar portion 144 has a shape that gradually expands from the distance w11 toward the tip, and the collar portion 144 is deformed in the direction F1. Therefore, when the tip of the E-shaped snap ring removal tool 100 is pressed against the shaft 900, the distance w11 between the pair of flanges 144 in contact with the shaft 900 spreads away from each other, and after passing through the shaft 900, the distance w11 again. Return to the position of. Further, the distance w21 between the pair of shaft guide portions 112 of the gripping member 110 is configured to loosely fit the outer diameter D1 of the shaft 900. Therefore, the tip end portion of the E-shaped snap ring removal tool 100 comes into a state in which the shaft 900 is loosely fitted by such an operation.

  Next, the user moves the E-shaped snap ring removal tool 100 to the position where the shaft guide portion 112 contacts the E-shaped snap ring 800 and the E-shaped snap ring 800 is loosely fitted to the snap ring loose fitting portion 143 Move in the positive direction. When the user causes the snap ring free fitting portion 143 and the E-shaped snap ring 800 to be loosely fitted, the pair of end portions 800 b of the E-shaped snap ring 800 and the pair of flange portions 144 are positioned near each other. Do the work as you want.

  When the end of the E-shaped snap ring removal tool 100 is inserted into the shaft 900, if the z-axis negative side of the shaft 900 is in the open state, the gap between the shaft guide portions 112 is not allowed to pass through the collar portion 144. It may be inserted directly into the shaft 900. In that case, the user may move the E-shaped snap ring removal tool 100 as it is in the z-axis positive direction to move the E-shaped snap ring 800 and the snap ring loose fitting portion 143 to a loose fit.

  Next, the state in which the E-shaped snap ring removing tool 100 is mounted on the shaft 900 will be described with reference to FIG. FIG. 4 is a view showing the E-shaped snap ring removal tool 100 according to the first embodiment mounted on a shaft.

  In FIG. 4, the shaft 900 is loosely fitted to the shaft guide portion 112, and the E-shaped snap ring 800 is loosely fitted to the snap ring loose fitting portion 143. Further, in FIG. 4, the E-shaped retaining ring 800 is located in the area of the thickness of the removal piece 140. At this time, when the E-shaped retaining ring 800 is pressed in the y-axis plus direction, the contact portion 154 and the shaft 900 have a gap H1.

  After the state shown in FIG. 4 is reached, the user operates the operation lever 120 so that the grip portion 111 and the operation portion 121 approach each other. Thereby, the slide member 150 resists the biasing force of the coil spring 199, moves in the y-axis plus direction (direction F2), and the contact portion 154 approaches the shaft 900.

  Next, referring to FIG. 5, a state in which the contact portion 154 contacts the shaft 900 will be described. FIG. 5 is a view showing a state in which the slide member of the E-shaped snap ring removal tool 100 mounted on the shaft is in contact with the shaft.

  The abutment portion 154 abuts on the shaft 900 and applies a force in the direction F 2 to the shaft 900. Thus, the shaft 900 receives a force in the direction F2 from the abutment portion 154. When the shaft 900 is fixed, the slide member 150 stops the displacement while receiving the reaction force of the force in the direction F2 from the shaft 900. Then, the portion of the E-shaped snap ring removal tool 100 excluding the slide member 150 starts to be displaced in the direction F3. Therefore, the end 800 b of the E-shaped retaining ring 800 abuts on the hook end 144 a which is a contact point with the hook 144.

  Even after the E-shaped snap ring 800 abuts on the hook end portion 144 a, the user continues the operation of bringing the grip portion 111 and the operation portion 121 closer to each other. Then, the E-shaped retaining ring 800 which receives the force in the direction F3 from the wedge end 144a starts to move in the direction F3 in which it is withdrawn from the shaft 900. At this time, the first holding portion 145 holds the axial direction of the E-shaped retaining ring 800, and maintains this until the removal of the E-shaped retaining ring 800 is completed.

  Next, with reference to FIG. 6, a state in which the E-shaped retaining ring removing tool 100 removes the E-shaped retaining ring will be described. FIG. 6 is a view showing a state in which the E-shaped snap ring removal tool 100 is in the process of removing the E-shaped snap ring.

  The user continues the operation of bringing the gripping unit 111 and the operation unit 121 close to each other. Therefore, the portion of the E-shaped snap ring removal tool 100 excluding the slide member 150 continues the displacement in the direction F3. Accordingly, the end 800b of the E-shaped retaining ring 800 receives a force in the direction F3 from the wedge end 144a. As a result, the E-shaped retaining ring 800 starts to be displaced in the direction F3 while the ends 800b deform in the direction F1 in which they are separated from each other.

  As the end portions 800b of the E-shaped retaining ring 800 deform away from each other, the collar portion 144 also displaces in the direction F3 while deforming so as to follow the deformation of the E-shaped retaining ring 800. At this time, the seventh shaft 167 is displaced in the directions F1 and F3 following the collar portion 144, and the relief hole 113 and the relief hole 153 do not disturb the movement of the seventh shaft 167.

  The user continues the operation until the removal of the E-shaped retaining ring 800 is completed. As a result, the E-shaped retaining ring 800 is displaced in the direction F3 while the end portions 800b spread apart from each other along the shape of the groove portion of the shaft 900. Then, when the contact portion with the shaft 900 exceeds the diameter of the shaft 900, the end 800b of the E-shaped snap ring 800 approaches each other by the restoring force of the E-shaped snap ring 800 itself or the restoring force of the removal piece 140, Along the shape of the groove of the shaft 900, it is displaced in the direction F3.

  Next, with reference to FIG. 7, a state in which the E-shaped snap ring removal tool 100 completes the removal of the E-shaped snap ring 800 will be described. FIG. 7 is a view showing a state in which the E-shaped snap ring removal tool 100 completes the removal of the E-shaped snap ring.

  The user continues the operation of bringing the gripping unit 111 and the operation unit 121 close to each other. Therefore, the portion of the E-shaped snap ring removal tool 100 excluding the slide member 150 continues the displacement in the direction F3. As the user continues the operation, the E-shaped retaining ring 800 is displaced to the position shown in FIG.

  In the position shown in FIG. 7, the E-shaped retaining ring 800 is out of the groove of the inserted shaft 900. The slide shaft 156 is in contact with the E-shaped retaining ring 800. That is, the E-shaped retaining ring 800 is held in the radial direction by the pair of collar end portions 144 a of the E-shaped retaining ring removing tool 100 and the slide shaft 156. Further, the second holding portion 155 provided at the top of the slide shaft 156 reaches a position overlapping the E-shaped retaining ring 800. Thus, the E-shaped retaining ring 800 is held by the pair of first holding portions 145 and the second holding portion 155 in the z-axis positive direction. Further, the E-shaped retaining ring 800 is held by the pair of shaft guide portions 112 extending inward from the outer diameter of the E-shaped retaining ring 800 in the z-axis negative direction. Thereby, the E-shaped snap ring removal tool 100 prevents the removed E-shaped snap ring 800 from being unintentionally dropped from the E-shaped snap ring removal tool 100.

  In the position shown in FIG. 7, the E-shaped retaining ring 800 abuts on the slide shaft 156. Thereby, the user stops the operation of bringing the gripping unit 111 and the operation unit 121 close to each other. The user can release the E-shaped snap ring removal tool 100 from the shaft 900 while maintaining the relative position between the grip portion 111 and the operation portion 121. As a result, the E-shaped snap ring removal tool 100 can maintain the state in which the removed E-shaped snap ring is held.

  Next, with reference to FIG. 8, a state in which the E-shaped snap ring removal tool 100 holds the E-shaped snap ring 800 removed will be described. FIG. 8 is a view showing a state in which the E-shaped retaining ring removing tool 100 holds the E-shaped retaining ring removed. FIG. 8 shows a cross section taken along line VIII of FIG.

  As shown in FIG. 8, the E-shaped retaining ring 800 is held by the wedge end portion 144 a and the slide shaft 156 in the radial direction (y-axis direction). In addition, the E-shaped retaining ring 800 is held by the first holding portion 145, the second holding portion 155, and the shaft guide portion 112 in the axial direction (z-axis direction). More specifically, the first holding portion 145 and the second holding portion 155 hold the E-shaped retaining ring 800 so as to prevent the drop in the z-axis positive direction. Further, the shaft guide portion 112 holds the E-shaped snap ring 800 so as to prevent the drop in the z-axis negative direction.

  As described above, the E-shaped snap ring removal tool 100 is configured to securely hold the removed E-shaped snap ring.

  Next, with reference to FIG. 8, the configuration in the axial direction of the tip portion of the E-shaped snap ring removal tool 100 will be described. In FIG. 8, one main surface (also referred to as a first main surface) of the flat plate-like removal piece 140 is in contact with the gripping member 110 on the z-axis negative direction side. Further, in the removal piece 140, there is no member or the like in which the other main surface (also referred to as a second main surface) is in contact in the z-axis plus direction. The first holding portion 145 and the second holding portion 155 are configured not to protrude from the main surface (second main surface) on the z-axis plus direction side of the removal piece 140.

  With such a configuration, the E-shaped snap ring removal tool 100 can increase the degree of freedom of operation.

  Next, with reference to FIG. 9, an operation of releasing the E-shaped retaining ring 800 removed by the E-shaped retaining ring removing tool 100 will be described. FIG. 9 is a view showing an operation of releasing the E-shaped retaining ring from which the E-shaped retaining ring removing tool 100 has been removed.

  The user loosens the force holding the grip portion 111 and the operation portion 121, and releases the force holding the operation portion 121 while holding the grip portion 111. Then, the slide member 150 is displaced in the negative y-axis direction by the biasing force of the coil spring 199. As a result, the slide shaft 156 is separated from the E-shaped retaining ring 800 held by the pair of flanges 144 and the slide shaft 156. Therefore, the E-shaped retaining ring 800 is released from the restriction in the radial direction. Further, the second holding portion 155 is separated from the E-shaped retaining ring 800 by displacing the slide shaft 156 in the negative direction of the y-axis. Thereby, the E-shaped retaining ring 800 is released from the restriction in the z-axis positive direction.

  As described above, the E-shaped retaining ring 800 is released from the holding in the radial direction and the axial direction. Therefore, the E-shaped snap ring 800 drops out of the E-shaped snap ring removal tool 100 by the user turning the extraction piece 140 side of the E-shaped snap ring extraction tool 100 downward. The user can release the E-shaped retaining ring 800 from the E-shaped retaining ring removing tool 100 by releasing the operation portion 121 in this manner. With such a configuration, the E-shaped snap ring removal tool 100 can hold the extracted E-shaped snap ring at a desired position and can be released as appropriate. As a result, it is possible to prevent the E type retaining ring removed from being unintentionally scattered and the like.

  The first embodiment has been described above, but the configuration of the E-shaped snap ring removal tool 100 is not limited to that described above. For example, the slide member 150 may be provided between the gripping member 110 and the extraction piece 140. In this case, for example, the slide member 150 has a hole for escaping the fifth shaft 165. Further, the fifth shaft 165 has a step portion to such an extent that the slide member 150 can slide without rattling, and the removal piece 140 is fixed to the step portion so that the movement of the slide member 150 is not hindered. Further, with such a configuration, the slide member 150 realizes a stable slide operation between the grip portion 110 and the removal piece 140. Further, in this case, the contact portion 154 may not be erected from the slide member 150, and may be accommodated in the thickness of the plate member of the slide member 150.

  Further, the E-shaped snap ring removal tool 100 may be configured to interlock the operation lever 120 and the slide member 150 by a cam structure instead of the connection member 130. In this case, for example, the control lever 120 has a cam groove around the first hole 181 whose distance from the first hole 181 gradually changes, and the slide member 150 has a shaft engaged with the cam groove.

  With the configuration described above, the E-shaped snap ring removal tool 100 according to the first embodiment can stably perform a series of operations for removing the E-shaped snap ring from the shaft, and the user of the tool The load can be reduced.

Second Embodiment
Next, Embodiment 2 will be described with reference to FIGS. 10 and 11. FIG. 10 is a schematic view of an E-shaped snap ring removal tool 200 according to a second embodiment. The E-shaped snap ring removal tool 200 according to the second embodiment is different from the E-shaped snap ring removal tool 100 according to the first embodiment in the form of the gripping portion. The E-shaped snap ring removal tool 200 according to the second embodiment is suitable for an E-shaped snap ring relatively smaller than the E-shaped snap ring removal tool 100 according to the first embodiment, and is similar to a stapler. It constitutes a mode of use. The E-shaped snap ring removal tool 200 mainly has a gripping member 210, an operation lever 220, a connecting member 130, a removal piece 140, and a slide member 150.

  The gripping member 210 is a plate-like member, and a pair of shaft guide portions 112 is provided at the tip end. Further, the tip end of the gripping member 210 is engaged with the removal piece 140 and the slide member 150.

  The gripping member 210 has a gripping portion 211 on the side opposite to the tip end side where the shaft guide portion 112 is provided. In addition, the gripping member 210 has a first shaft 161 at an intermediate portion which is a portion between the shaft guide portion 112 and the gripping portion 211. The gripping portion 211 extends parallel to the elongated tip having the shaft guide portion 112 so as to be rotationally symmetrical with respect to the first shaft 161, and the first tip portion 211e which is one end is , And extends to a predetermined position between the axis guide portion 112 and the first axis 161. Further, the other end of the grip portion 211 is formed in a U shape so as to surround the first shaft 161. The shape and the size of the gripping portion 211 are set such that the user can easily grip the palm so as to wrap the gripping portion 211 by presenting such a shape.

  One end of the operation lever 220 is rotatably supported by the first shaft 161. In addition, the operation lever 220 has an operation portion 221 on the other end side. The operation portion 221 extends so as to form a predetermined angle Y within 90 degrees with a portion extending from the vicinity of the first axis 161 to the tip end side of the gripping member 210. The angle Y is, for example, 40 degrees. The E-shaped snap ring removal tool 200 is formed so that the user can grip the grip portion 211 other than the thumb and operate the operation portion 221 using the thumb. It is preferable that the holding part 211 and the operation part 221 have a length easy for the user to operate. As described above, the control lever 220 of the E-shaped snap ring removal tool 200 according to the second embodiment extends to the tip side of the E-shaped snap ring extraction tool 200 than the first shaft 161 which is a pivot.

  The configuration of the removal piece 140, the slide member 150, and the connection member 130 is the same as that of the E-shaped snap ring removal tool 100 according to the first embodiment.

  With the configuration described above, the E-shaped snap ring removal tool 200 can operate as follows. The operation lever 220 pivots in a direction A1 in which the first tip end portion 211e of the grip portion 211 and the tip end portion 221e of the operation portion 221 approach each other. When the control lever 220 pivots in the direction A 1, the connection member 130 transmits the displacement of the control lever 220 to the slide member 150. Thereby, the slide member 150 is displaced in the direction B1 parallel to the longitudinal direction of the grip member 210 and approaching the axis guide portion 112.

  On the other hand, the E-shaped snap ring removal tool 200 can also operate as follows. The operation lever 220 pivots in a direction A2 in which the first tip end portion 211e of the grip portion 211 and the tip end portion 221e of the operation portion 221 are separated from each other. When the control lever 220 pivots in the direction A 2, the connection member 130 transmits the displacement of the control lever 220 to the slide member 150. Thereby, the slide member 150 is displaced in the direction B2 parallel to the longitudinal direction of the grip member 210 and away from the shaft guide portion 112. That is, the connection member 130 converts the displacement in the rotational direction of the operation lever 220 which is the operation member and the displacement in the linear movement direction of the slide member 150.

  Next, details of each configuration of the E-shaped snap ring removal tool 200 will be described with reference to FIG. FIG. 11 is an exploded perspective view of the E-shaped snap ring removal tool 200 according to the second embodiment. The details of each part will be described below.

  The holding member 210 is a plate-like member, and is formed by press-forming a metal plate. Similar to the gripping member 210 described in the first embodiment, the gripping member 210 has the shaft guide portion 112 formed at one end, has the first shaft 161 in the middle portion, and is in the vicinity of the first shaft 161. , And a sixth shaft 166 engaged with the coil spring 199. However, the gripping member 210 in the E-shaped snap ring removal tool 200 differs from the gripping member 210 described in the first embodiment in the shape of the gripping portion.

  As described with reference to FIG. 10, the grip portion 211 extends parallel to the tip end portion having the elongated shaft guide portion 112 so as to be a rotation target with respect to the first shaft 161, The end portion extends to a predetermined position between the axis guide portion 112 and the first axis 161. Further, the other end of the grip portion 211 is formed in a U shape so as to surround the first shaft 161. In addition, the grip portion 211 is formed by covering the end portion of the metal plate which is the main surface of the grip member 210 with resin, rubber, an elastomer, or the like to the extent that the user can easily grip. The gripping portion 211 illustrated in FIG. 11 covers the end portion of the main surface of the gripping member 210, and is erected in a band with a predetermined width (for example, about 1 cm) in the vertical direction on both sides of the main surface. There is.

  The control lever 220 is a plate-like member whose main surface is L-shaped. A second hole 282 is drilled in the vicinity of one end of the two L-shaped arms, and a first hole 281 is drilled in the bent portion. In addition, the operation portion 221 is formed from the vicinity of the bent portion to the tip on the opposite side to the side where the second hole 282 is bored. The control lever 220 is formed by press-forming a metal plate.

  The operation portion 221 is a portion that the user directly touches when operating the E-shaped snap ring removal tool 200, and is provided so as to form a surface in the vertical direction of the main surface. The operation unit 221 is covered with, for example, a resin, a rubber, or an elastomer. The control lever 220 illustrated in FIG. 11 is formed on the assumption that the user's thumb operates by pressing the control portion 221. For this reason, the operation unit 221 illustrated in FIG. 11 has a concave shape that fits moderately well when the abdomen of the thumb is placed. The position of the second hole 282 is preferably set so that the displacement of the second hole 282 is along the longitudinal direction of the tip portion having the shaft guide portion 112 as described in the first embodiment.

  With the above configuration, the E-shaped snap ring removal tool 200 according to the second embodiment stabilizes a series of operations when removing a small diameter E-shaped snap ring from the shaft as compared with the case of the first embodiment. It is possible to reduce the load on the user who uses the removal tool. As in the first embodiment, the slide member 150 of the E-shaped snap ring removal tool 200 may be provided between the gripping member 110 and the removal piece 140.

Embodiment 3
Next, the third embodiment will be described. The third embodiment is different from the above-described embodiment in that a slide member 350 including a relief hole 353 and a stopper 353 s is provided instead of the relief hole 153 of the slide member 150.

  When the user removes the E-shaped retaining ring from the shaft using the E-shaped retaining ring extraction tool, the user can use the end 800 b of the E-shaped retaining ring 800 and the wedge end 144 a of the collar 144. It is necessary to carry out the work of bringing it into contact. However, even if the work is not performed reliably and the heel end portion 144a and the end portion 800b of the E-shaped retaining ring 800 are not properly in contact with each other, the user can remove the E-shaped retaining ring May operate the In such a case, when the collar portion 144 rides on the outer diameter portion of the E-shaped retaining ring, the bifurcated collar portion 144 is greatly expanded, and there is a possibility that the extraction piece 140 may be deformed. The third embodiment has a configuration for suppressing the breakage or the like of the E-shaped snap ring removal tool in such an abnormal state.

  FIG. 12 is a view showing the shape of the relief hole of the slide member of the E-shaped snap ring removal tool according to the third embodiment. The E-shaped snap ring removal tool 300 according to the third embodiment has a slide member 350 instead of the slide member 150 of the above-described E-shaped snap ring removal tools 100 and 200. The slide member 350 has a relief hole 353.

  The relief hole 353 is a hole through which the seventh shaft 167 is inserted, like the relief hole 153 according to the first and second embodiments. However, the relief hole 353 differs from the relief hole 153 according to the first and second embodiments in that the relief hole 353 has a stopper 353s. In the following description, the seventh axis is also referred to as a buttocks slide axis.

  The stopper 353 s is set so as to abut on the buttocks slide shaft to prevent the buttocks and the abutting portions from approaching each other under preset conditions. The conditions set in advance are: when the E-shaped snap ring removal tool is attached to the shaft in which the E-shaped snap ring is inserted, and the hook portion 144 and the contact portion 154 are operated to approach each other At least one of the portions 144 is displaced along the outer diameter of the E-shaped retaining ring. In this case, the stopper 353s abuts on the seventh shaft 167 (the buttock slide shaft) before the distance between the abutting portion 154 and the buttocks 144 reaches half of the outer diameter of the shaft. The abutment portions are set to prevent them from approaching each other.

  As shown in the figure, the relief hole 353 has a shape in which a part of a substantially rectangular hole shape protrudes inward. The protruding portion corresponds to the stopper 353s. The relief hole 353 has a narrow width in the x-axis direction corresponding to the portion of the stopper 353s, and has a width W30 at the narrowest portion, that is, the tip of the stopper 353s. The width W30 is wider than the seventh axis 167. Therefore, the relief hole 353 does not prevent the seventh shaft 167 from sliding when the E-shaped snap ring removal tool 300 performs an operation to remove the E-shaped snap ring normally.

  Further, a distance W31 is between the center line of the slide member 350 in the width direction (x-axis direction) and the tip of the stopper 353s. The distance W31 is set so that the seventh shaft 167 and the tip of the stopper 353s abut each other when the removal operation is performed in a state where the collar portion 144 rides on the outer diameter portion of the E-shaped retaining ring . Further, the distance W31 is set so as to pass through the space of the width W30 of the relief hole 353 described above without the seventh shaft 167 and the tip of the stopper 353s coming into contact when the removal operation is normally performed. ing.

  Next, the function of the stopper 353s will be described with reference to FIG. FIG. 13 is a view showing an example of an abnormal use state of the E-shaped snap ring removal tool. In the figure, since the opening 800a of the E-shaped snap ring 800 is rotating to the left, the E-shaped snap ring extraction tool 300 is in a situation where the extraction operation is started with the E-shaped snap ring 800 not properly attached. is there.

  In such a situation, the abutment portion 154 abuts on the shaft 900, and the portion excluding the slide member 350 continues to be displaced in the direction F3. Of the left and right hooks 144, the left hook 144 is not in contact with the E-shaped retaining ring 800. Therefore, the left heel portion 144 continues the displacement in the direction F3. On the other hand, the right flange portion 144 is in contact with the outer diameter portion of the E-shaped retaining ring 800. Therefore, as the removal piece 140 is displaced in the direction F3, the wedge end 144a is pushed and spread in the direction F1. Therefore, the wedge end 144a is displaced in the direction F4 along the outer diameter of the E-shaped retaining ring 800.

  The seventh shaft 167 is also displaced in the direction F4 in accordance with the displacement of the heel end 144a. Then, the seventh shaft 167 abuts on the stopper 353 s. When the seventh shaft 167 abuts on the stopper 353 s, the relative displacement between the slide member 350 and the removal piece 140 is hindered. That is, the stopper 353 s prevents the collar portion 144 and the contact portion 154 from approaching each other by coming into contact with the seventh shaft 167.

  In the illustrated situation, the contact portion 154 and the collar portion 144 have a distance H30. At this time, the center of the seventh shaft 167 is located on the y-axis plus side with respect to the tip end portion of the stopper 353s. That is, the seventh shaft 167 is before passing the tip of the stopper 353s. Further, at this time, a distance W 32 is from the center line of the slide member 350 to the outside of the seventh axis 167. The distance 32 is larger than the distance W31 from the center line of the slide member 350 to the tip of the stopper 353s. Since the seventh shaft 167 and the stopper 353 s have such a positional relationship, the seventh shaft 167 abuts on the stopper 353 s. In addition, after the seventh shaft 167 and the stopper 353s abut on each other, the removal piece 140 can not move in the direction F3.

  The distance H30 between the contact portion 154 and the flange portion 144 in a state where the seventh shaft 167 contacts the stopper 353s is set to be longer than a half of the outer diameter D1 of the shaft 900. There is. The distance H30 is preferably about the same as the outer diameter D1 of the shaft 900. By setting in this manner, it is possible to reliably suppress plastic deformation of the arm portion 142 of the removal piece 140 beyond the elastic range.

  In this manner, the stopper 353 s prevents the collar portion 144 from expanding further in the direction F 1 and prevents the arm portion 142 from plastic deformation. Therefore, the E-shaped snap ring removal tool 300 according to the third embodiment can suppress breakage or the like of the E-shaped snap ring removal tool in a state where the E-shaped snap ring is not properly mounted.

  Next, the case where the E-shaped snap ring removal tool 300 operates normally will be described with reference to FIG. FIG. 14 is a view showing an example of a normal use state of the E-shaped snap ring removal tool according to the third embodiment.

  As shown in the figure, in the E-shaped snap ring removal tool 300, two wedge ends 144a abut on the end 800b of the E-shaped snap ring 800, respectively. Therefore, the E-shaped snap ring removal tool 300 moves the E-shaped snap ring 800 in the direction F3 while expanding the opening of the E-shaped snap ring 800 as described in the first embodiment. Further, as the end portions 800b of the E-shaped retaining ring 800 deform so as to be separated from each other, the collar portions 144 are also displaced so as to be separated from each other, and are displaced in the direction F3.

  In the illustrated situation, the contact portion 154 and the collar portion 144 have a distance H30. At this time, the center of the seventh shaft 167 is located on the y-axis plus side with respect to the tip end portion of the stopper 353s. That is, the seventh shaft 167 is before passing the tip of the stopper 353s. At this time, a distance W33 is from the center line of the slide member 350 to the outside of the seventh axis 167. The distance 33 is smaller than the distance W31 from the center line of the slide member 350 to the tip of the stopper 353s. Because the seventh shaft 167 and the stopper 353 s have such a positional relationship, the seventh shaft 167 does not contact the stopper 353 s and moves in the direction F 3.

  The seventh axis 167 is also displaced along the trajectory T1 after the situation shown. In the figure, the position 167a, the position 167b and the position 167c of the seventh axis 167 are shown along the locus T1. Hereinafter, the movement of the seventh axis 167 will be described along the arrow of the locus T1.

  The seventh axis 167 moves from the upper side (y-axis positive side) to the lower side (y-axis negative side) of the relief hole 353 along the direction F3 substantially parallel to the y-axis, and a position 167a indicated by a broken line in the figure. Reaching That is, the seventh shaft 167 passes the tip of the stopper 353s without exceeding the distance W31.

  Next, the seventh axis 167 moves from the position 167a to the position 167b along a gentle curve. At this time, the seventh axis 167 draws a locus along which the end 800 b of the E-shaped retaining ring 800 advances in the y-axis minus direction while being separated once along the axis 900. As shown in the figure, the seventh axis 167 of this section exceeds the distance W31, but at this time after passing the stopper 353s. Therefore, the movement of the seventh shaft 167 is not blocked by the stopper 353s.

  Next, the seventh axis 167 moves a gentle curved locus from the position 167 b to the position 167 c. This section is after the E-shaped retaining ring 800 overcomes the diameter of the shaft 900. Therefore, the ridge portions 144 move in the negative y-axis direction while approaching each other. The position 167 c is in a state where the removal operation of the E-shaped retaining ring 800 is completed.

  The third embodiment has been described above, but the third embodiment is not limited to the above configuration. For example, the slide member 350 may have a collar portion slide shaft corresponding to the seventh shaft 167, and the removal piece 140 may have a convex shape corresponding to a hole corresponding to the relief hole 353 and the stopper 353s.

  As described above, according to the third embodiment, a series of operations for removing the E-shaped retaining ring from the shaft can be stably performed, and the load on the user who uses the tool can be reduced and the tool can be broken. It is possible to provide an E-shaped snap ring removal tool that suppresses etc.

  The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the present invention.

100, 200, 300 E-shaped snap ring removal tool 110, 210 grasping member 111, 211 grasping portion 112 shaft guide portion 113 relief hole 114 guide groove 115 guide hole 120, 220 operation lever 121, 221 operation portion 130 connection member 135 spacer 140 Removal piece 142 Arm portion 143 Retaining ring loose fitting portion 144 Flange portion 145 First holding portion 150, 350 Slide members 153, 353 Relief hole 353s Stopper 154 Contact portion 155 Second holding portion 156 Slide shaft 161 First shaft 181 First Hole 800 E Retaining Ring 900 Axis

Claims (12)

An E-shaped retaining ring removing tool for removing an E-shaped retaining ring from a radial direction with respect to an axis in which the E-shaped retaining ring is inserted,
A gripping member having a pair of shaft guide portions bifurcated into two for free insertion on the shaft at one end side, and a gripping portion at the other end side;
A removal piece connected to the shaft guide portion and having a ridge portion for hooking the end portion of the E-shaped snap ring to a pair of bifurcated tips;
A slide member slidably engaged with the grip member and having an abutment portion displaced along a gap of the bifurcated shaft guide portion to abut the shaft;
E-type snap ring removal tool. The slide member has a slide shaft which holds the E-shaped snap ring removed from the shaft in a radial direction with a pair of the collars.
The E-shaped snap ring removal tool according to claim 1. The E-shaped snap ring removing tool according to claim 1 or 2, wherein the collar portion has a first holding portion for holding an axial direction of the E-shaped snap ring. The E-shaped snap ring removal tool according to any one of claims 1 to 3, wherein the slide member has a second holding portion for holding an axial direction of the E-shaped snap ring. The removal piece is a flat member, and the first main surface is in contact with the holding member or the slide member,
The first holding portion is provided so as not to protrude from the second main surface of the extraction piece.
The E-shaped snap ring removal tool according to claim 3. The removal piece is a flat member, and the first main surface is in contact with the holding member or the slide member,
The second holding portion is provided so as not to protrude from the second main surface of the removal piece.
The E-shaped snap ring removal tool according to claim 4. The shaft guide portion extends inward from the outer diameter of the E-shaped snap ring in a state of holding the E-shaped snap ring removed from the shaft.
The E-shaped snap ring removal tool according to any one of claims 1 to 6. It further comprises an elastic body that biases the flange portion of the removal piece and the contact portion of the slide member away from each other.
The E-shaped snap ring removal tool according to any one of claims 1 to 7. The apparatus further includes an operating member having an operating portion, slidably engaged with the gripping member, and interlocked with the slide member.
The E-shaped snap ring removal tool according to any one of claims 1 to 8. The holding member and the operation member are pivotally supported to each other in a rotatable manner, and by sliding the holding portion and the operation portion so as to approach each other, the ridge portion of the extraction piece and the contact of the slide member The joints approach each other,
An E-shaped snap ring removal tool according to claim 9. One end is engaged with the operation member, and the other end is engaged with the slide member sliding in the linear movement direction, and the displacement of the operation member in the rotational direction and the displacement of the slide member in the linear movement direction are converted It further has a connecting member,
An E-shaped snap ring removal tool according to claim 10. The slide member further includes a relief hole loosely fitted to a buttocks slide shaft erected on the removal piece, and a stopper provided in the relief hole,
The stopper is
When the E-shaped snap ring removal tool is attached to the shaft in which the E-shaped snap ring is inserted, and the flange portion of the removal piece and the contact portion of the slide member are operated to approach each other In
When at least one of the collars is displaced along the outer diameter of the E-shaped retaining ring, the distance between the contact portion and the collar is half the diameter of the shaft. Before reaching, contact with the buttocks slide shaft to prevent the buttocks and the abutment from approaching each other,
The E-shaped snap ring removal tool according to any one of claims 1 to 11.

Images