JP2015051474A - Protective cap removal tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective cap removal tool capable of easily removing a protective cap laid on a screw head for protecting a screw from the screw.SOLUTION: In the protective cap removal tool for removing the protective cap laid on the screw head from the screw, a vertical-shaped engaging arm of freely opening-closing a lower end part is installed in a plurality on a lower outer peripheral surface of a hollow cylindrical tool body of forming an upper half part as a holding part, and a lower end part of the engaging arm is constituted for squeezing or freely opening a lower end opening part of the tool body by opening-closing operation of a holding claw as the substantially L-shaped holding claw, and the protective cap laid on the screw head can be inserted into the lower end opening part of the tool body by cooperation of push-down operation of the tool body and opening operation of the holding claw, and a bottom part of the protective cap inserted into the lower end opening part of the tool body can be lifted by blocking-up operation of the holding claw, and the protective cap can be lifted and removed from the screw head by lifting operation of the tool body.

Description

  The present invention relates to a protective cap removal jig used to remove a protective cap attached to protect a screw formed in advance to be screwed to another member from the screw.

  Conventionally, for example, in a pulley unit used around an engine of an automobile, as shown in FIG. 8, a component in which a screw (male screw) is projected from the shaft core of the pulley is used. In order to protect, a screw is covered with a protective cap made of an elastic material such as rubber or resin. That is, in a pulley unit that functions as a tension pulley for a timing belt of an automobile engine, a pulley 102 is provided to be rotatable around a bolt shaft 103 via a rolling bearing (not shown) provided therein. The pulley unit 101 is integrally attached to the engine (not shown) by screwing and fixing the bolt shaft 103 to a predetermined part of the engine block (not shown). In such a pulley unit 101, the bolt shaft 103 protrudes from the shaft core of the pulley 102 to the outside.

  Thus, the pulley unit 101 provided with the rolling bearing is carried into an assembly process for assembling around the engine with the head of the bolt shaft 103 protruding. In this case, until the pulley unit 101 is carried into the assembly process from the manufacturing site, a plurality of pulley units 101 are accommodated in one transport case (packaging box) 120 in consideration of transportation costs. That is, the transfer case 120 is partitioned by the partition plate 121 to form a large number of storage spaces 123, and the pulley unit is stored in each storage space 123 with the protruding head of the bolt shaft 103 facing upward, An alignment plate 122 having a number of shaft insertion holes 124 through which the protruding heads of the standing bolt shaft 103 can be inserted is covered from above, and the screw portion 104 formed on the bolt shaft 103 is protruded from the shaft insertion hole 124. The pulley unit 101 is fixed in the storage space 123. At the same time, a resin-made protective cap is placed on the protruding head of the protruding screw portion 104 so that the screw portion 104 protruding from the shaft insertion hole 124 does not come into contact with other screw portions 104 due to vibration during transportation. The device which covers 105 is made.

  When the pulley unit 101 is used for assembling around the engine, the protective cap 105 is manually removed. In the removal operation, the middle part of the protective cap 105 is gripped between fingers with force. For this reason, since the screw thread bites into the inner wall of the protective cap 105 made of resin, it is difficult to remove the protective cap 105 from the screw portion 104. Therefore, as shown in FIG. 9, an operation of forcibly pulling away the upper portion while holding the head portion (convex portion) 106 of the protective cap 105 using the pliers 110 is performed. Such an operation is very complicated and inefficient in an assembling process in which a large number of assemblies are assembled within a predetermined time, and the worker is greatly fatigued.

  At present, a technology for easily performing such a protective cap removal work has not been developed, and the work using a tool such as pliers is still performed as described above.

  However, as a reference technique for removing the protective cap, Japanese Patent Application Laid-Open No. H10-228867 discloses a technique for extracting a covering material placed on the protruding portion for protecting the parts. For example, in the technique described in Patent Document 1, a technique related to a rubber impeller removing jig used for removing a rubber impeller from a drive shaft of a pump is disclosed. In this technology, a rubber impeller is sandwiched between two claw pieces of a lever pivoted in the middle, and rotated to pull out the lever claw piece in the middle part of the rubber impeller. It is.

JP 2004-108305 A

  Certainly, the technique described in Patent Document 1 is a technique for removing a covering material placed on a part, such as an impeller having a complicated shape that is difficult to insert a manpower or a tool, especially when the structure around the covering material is complicated. This is an effective technique for the target.

  However, in the technique described in Patent Document 1, the drive shaft without a screw thread is covered with the rubber impeller, and the claw pieces of the two levers are rotated upward while being bitten into the middle portion of the rubber impeller. Even if pulled up, the drive shaft does not have a thread, so the thread does not bite into the inner wall of the rubber impeller. Therefore, it cannot be effectively used for removing the protective cap 105 covering the bolt shaft 103 described above.

  Further, in the technique described in Patent Document 1, it is necessary to rotate the handle portion of the tool every time the rubber impeller is removed. Is also big.

  Further, since the removed protective cap is damaged, including when the protective cap is removed with pliers or the like, the protective cap cannot be reused.

  Moreover, since the protective caps 105 are scattered in the assembly process unless the removed protective caps are stored in a predetermined storage place every time they are removed, work efficiency is lowered.

  The present invention has been made in view of the circumstances as described above, and it is an object of the present invention to provide a protective cap removing jig that can easily remove a protective cap attached to protect a screw from the screw.

  In order to achieve the above object, the present invention provides the following protective cap removing jig.

  In the invention according to claim 1, a plurality of vertical engagement arms whose lower ends can be freely opened and closed are mounted on the lower outer peripheral surface of a hollow cylindrical jig body having the upper half as a gripping portion, and the engagement The lower end of the arm is configured as a substantially L-shaped holding claw so that the lower end opening of the jig body can be squeezed or opened by opening and closing the clamping claw, and the pressing operation of the jig body and the opening of the clamping claw In cooperation with the operation, a protective cap attached to the screw head can be inserted into the lower end opening of the jig body, and inserted into the lower end opening of the jig body by closing operation of the clamping claw. A protective cap removing jig configured to be able to lift the bottom portion of the protective cap, and to lift and remove the protective cap from the screw head by a lifting operation of the jig body.

  In the invention according to claim 2, the protective cap removing jig according to claim 1, wherein the engaging arm is urged to be opened and closed by surrounding an elastic link on an outer periphery of the engaging arm. .

  The invention according to claim 3 is characterized in that the hollow portion of the jig main body is configured such that the protective cap removed from the screw head can be stacked and stored from the lower part. The protective cap removal jig described.

  In the invention according to claim 4, in the hollow portion of the jig body, the inner diameter of the lower hollow portion is substantially the outer diameter of the protective cap, and the inner diameter of the upper hollow portion above it is made larger than the inner diameter of the lower hollow portion. 4. The protective cap removal jig according to claim 3, wherein the removal of the protective cap removed in the hollow portion of the jig body is facilitated.

  According to the protective cap removing jig according to the present invention, the protective cap attached for protecting the screw can be efficiently removed, and the fatigue of the operator can be greatly reduced.

It is a perspective view of the protection cap removal jig | tool which concerns on embodiment of this invention. It is an expanded view of the protective cap removal jig | tool which concerns on embodiment of this invention. (A) is an expanded view of the protective cap removal jig | tool which concerns on embodiment of this invention, (b) is sectional drawing. It is a figure which shows an example of the flow of a process using the protective cap removal jig | tool which concerns on embodiment of this invention. It is a figure which shows sequentially a mode that a protective cap is removed using the protective cap removal jig | tool which concerns on embodiment of this invention. It is sectional drawing which shows the mode of the protective cap in the hollow part of the protective cap removal jig | tool which concerns on embodiment of this invention. It is a figure which shows the use condition of the protective cap removal jig | tool which concerns on embodiment of this invention. It is a figure which shows an example of the accommodation state of the pulley unit which has a protective cap, and a pulley unit. It is a figure which shows the mode of the conventional process which removes a protective cap using a tool.

  The present invention is, for example, a jig used for removing a protective cap or the like that protects a screw portion formed on a bolt shaft of a pulley unit used around an engine of an automobile. In other words, the protective cap removal jig is pushed from above the screw toward the protective cap to engage with the protective cap, and the protective cap removal jig is moved upward to efficiently remove the protective cap placed on the screw. It can be lifted and removed to greatly reduce the fatigue of the operator.

  Hereinafter, a protective cap removing jig 1 according to an embodiment of the present invention will be described with reference to the drawings.

  Note that the upper and lower relationship in the protective cap removing jig 1 in the present description will be described with the lower end opening 6 as the lower side as shown in FIG. 1A unless otherwise specified in the present description. Further, the relationship between the protective cap removal jig 1 and the protective cap 105 will be described with the protective cap removal jig 1 as the upper side and the protective cap 105 as the lower side as shown in FIG. 5 unless otherwise specified in the present description. .

  Further, in the present description, the same or right-symmetrical structures and parts are denoted by the same reference numerals in principle, only one of the left and right is described, and the description of the other is omitted as appropriate.

  As shown in FIGS. 1A, 1B, 2 and 7, the protective cap removing jig 1 is formed on the lower outer peripheral surface of a hollow cylindrical jig body 2 having the upper half as a gripping portion 5. A plurality of vertical engagement arms 3 whose lower end portions can be freely opened and closed are mounted, and the lower end portions of the engagement arms 3 serve as substantially L-shaped clamping claws 8 by opening and closing operations of the clamping claws 8. The opening 6 is configured to be freely squeezed or opened, and the screw head 109 is attached to the lower end opening 6 of the jig body 2 by cooperation of the pressing operation of the jig body 2 and the opening operation of the clamping claws 8. The protective cap 105 can be inserted, the bottom 107 of the protective cap 105 inserted into the lower end opening 6 of the jig body 2 can be lifted by closing the clamping claw 8, and the screw head can be lifted by lifting the jig body 2. So that the protective cap 105 can be lifted and removed from 109 Forms.

  Here, the pulley unit 101, the protective cap 105, and the transfer case 120 including the protective cap 105 that is the target of removal of the protective cap removal jig 1 according to the present embodiment will be described with reference to FIG.

  The pulley unit 101 functions as a tension pulley of a timing belt (not shown) of an automobile engine, and includes a pulley 102 and a bolt shaft 103. The pulley 102 is a rolling bearing (see FIG. (Not shown) so as to be rotatable around the bolt shaft 103. The pulley unit 101 is configured integrally with an engine (not shown) by screwing and fixing a screw portion 104 formed at the tip of the bolt shaft 103 to a predetermined portion of an engine block (not shown). In such a pulley unit 101, one end side of the bolt shaft 103 protrudes from one side of the pulley 102 as a screw portion 104, and a screw thread is formed on the screw portion 104 of the protruding portion of the bolt shaft 103. Yes.

  The protective cap 105 is formed of an elastic member such as rubber, is formed in a bag shape with one end opening attached to the screw portion 104 of the bolt shaft 103, and has a maximum outer diameter as a bottom portion 107 on the opening side. A knob-like convex portion 106 is formed on the upper portion for manufacturing and handling reasons. The inner diameter of the protective cap 105 is formed so as to cover the screw portion 104 in a close contact manner, and the protective cap 105 is attached to the screw head 109 of the screw portion 104 by utilizing the elastic characteristics of rubber. Further, by making the outer diameter of the convex portion 106 smaller than the inner diameter of the protective cap 105, the convex portion 106 can be inserted into the upper protective cap 105 space when the protective caps 105 are stacked.

  Further, the shape of the protective cap 105 to be removed is not limited to the present embodiment. For example, even a protective cap (not shown) that does not have the convex portion 106 has the gist of the present invention. Within range.

  Thus, the pulley unit 101 having the protective cap 105 is generally stored in a rectangular box-shaped transfer case 120. Specifically, the transfer case 120 is partitioned in advance by a partition plate 121 into a grid shape to form a large number of storage spaces 123, and the pulley unit 101 is stored in each storage space 123 with the bolt shaft 103 facing upward. To do. Next, the alignment plate 122 is put on the upper opening 125 of the transport case 120 so that the screw portion 104 formed on the bolt shaft 103 protrudes from the shaft insertion hole 124 of the alignment plate 122, and the pulley unit 101 is stored in the storage space 123. Close the lid after storing and fixing inside.

  In the present embodiment, the removal of the protective cap 105 that covers the bolt shaft 103 of the pulley unit 101 is described. However, the target component is not limited to the present embodiment, and the screw portion 104 is formed. It goes without saying that any part or part is within the scope of the present invention as long as the protective cap 105 is placed on the part to be covered.

  Next, the structure of each part of the protective cap removing jig 1 according to this embodiment will be described in detail.

  As shown in FIGS. 1, 2, and 3, the jig body 2 has a hollow cylindrical outer shape, and the engagement arm 3 is formed in the shape of the engagement arm 3 on the peripheral wall of the lower outer peripheral surface of the jig body 2. When the engaging arm 3 is loosely fitted in the first fitting groove 11 formed together, the first concave formed in the lateral direction on the outer peripheral surface of the jig main body 2. A virtual annular concave groove is formed by the groove 16 and the second concave groove 17 formed in the lateral direction on the outer surface of the engagement arm 3, and the annular elastic ring 13 is fitted into the concave groove for engagement. The urging portion 4 for the arm 3 is configured to open and close the lower end opening 6 of the jig body 2 by the clamping claws 8 at the lower end of the engagement arm 3.

  Further, the jig body 2 is formed in a substantially cylindrical shape with openings at both ends in which a hollow portion 9 capable of accommodating the protective cap 105 is formed. One end is a lower end opening 6 and the other end is an upper end opening 7. It is said. In addition, the upper half of the jig body 2 is a grip portion 5. Therefore, when the protective cap removing jig 1 is used, the lower end opening 6 side is applied to the head of the protective cap 105 as shown in FIG.

  Further, the hollow portion 9 has a lower hollow portion 22 at the lower portion and an upper hollow portion 23 at the upper portion, and the inner diameter of the lower hollow portion 22 is substantially the outer diameter of the bottom portion 107 of the protective cap 105 or slightly smaller. The inner diameter of the hollow portion 23 is slightly larger than the outer diameter of the bottom portion 107 of the protective cap 105, and a step is formed at the boundary between the lower hollow portion 22 and the upper hollow portion 23.

  The hollow portion 9 constitutes the upper and lower hollow portions 22 and 23 as described above, but the shape, size, and the like of the hollow portion 9 are not limited to the present embodiment. For example, the hollow portion 9 All of these may be the lower hollow portion 22.

  Moreover, although the external shape of the jig body 2 according to the present embodiment is substantially cylindrical, the external shape of the jig body 2 is not limited to the present embodiment. A cylindrical shape such as a square pipe may be used.

  As shown in FIG. 2, a second fitting groove 12 that communicates with the terminal end of the first fitting groove 11 in a substantially L shape is cut out on the end surface of the lower end opening 6 of the jig body 2. Specifically, the second fitting groove 12 is formed in a concave shape in which the peripheral wall end face of the lower end opening 6 of the jig body 2 is notched, and the holding claw 8 at the lower end of the engagement arm 3 is fitted.

  Moreover, it is a part of corner | angular part formed by the opposing both-side walls 14 and 14 which form the 2nd fitting groove | channel 12, and the end surface of the jig | tool main body 2 of the vicinity, Comprising: Opposition of the lower end opening part 6 surrounding wall Guide tapers 15, 15 are formed between the first fitting grooves 11, 11. The guide taper 15 is for facilitating the reception of the protective cap 105.

  As shown in FIGS. 2, 3 (a) and 3 (b), the engagement arm 3 is vertically mounted on the peripheral wall of the lower outer peripheral surface of the jig body 2 so that the lower end can be freely opened and closed. . The engagement arm 3 has a substantially L-shape formed by a long piece 18 that is loosely fitted in the first fitting groove 11 of the jig body 2 and a short piece 19 that covers a part of the opening of the lower end opening 6. The short piece 19 constitutes the above-described sandwiching claw 8 having an engagement surface 21 on the inner surface for enabling engagement from the bottom surface 108 side of the protective cap 105. The clamping claw 8 is configured so that the lower end opening 6 of the jig body 2 can be squeezed or opened.

  Further, the tip of the opposing nail claw 8 is formed as a tapered portion 20 with an inclination that expands from the top to the bottom. The tapered portion 20 has a maximum expanded diameter 26 at the lower end that is at least larger than the outer diameter of the protective cap 105, and a minimum expanded diameter 27 at the upper end that is at least smaller than the outer diameter of the protective cap 105. In addition, the location of the clamping claw 8 having the maximum expanded diameter 26 is defined as the maximum expanded diameter portion 28, and the location of the clamping claw 8 having the minimum expanded diameter 27 is defined as the minimum expanded diameter portion 29.

  As described above, the protective cap removal jig 1 according to the present embodiment is configured, and the lower hollow portion of the jig body 2 is cooperated with the pressing operation of the jig body 2 and the opening operation of the clamping claws 8. 22, the protective cap 105 attached to the screw head 109 can be inserted, and the bottom 107 of the protective cap 105 inserted into the lower hollow portion 22 of the jig body 2 by the closing operation of the clamping claw 8 can be lifted. The protective cap 105 can be removed from the screw head 109 by the lifting operation of the jig body 2.

  In addition, although the protective cap removal jig | tool 1 which concerns on this embodiment uses the O-ring 13 as the elastic ring 13, and is equipped with two O-rings 13 adjacent, the kind, number, and arrangement | positioning location of the elastic ring 13 are provided. Etc. are not limited to this embodiment.

  Next, the flow of a series of processes for removing the protective cap 105 is shown in FIGS. 4, 5A to 5D, and FIG. Further details will be described.

  First, a pulley unit 101 is prepared in which the threaded portion 104 of the bolt shaft 103 is substantially covered with a protective cap 105 (step S1). In this case, the protective cap 105 is placed on a work table (not shown) so as to face upward. When there are a plurality of pulley units 101 to be processed, they are placed on the work table so that the protective caps 105 of all the pulley units 101 face upward and are adjacent to each other.

  In the case of the pulley unit 101 housed in the transfer case 120 as shown in FIG. 7, the operation can be performed as it is with the lid (not shown) removed.

  Next, the grip part 5 of the protective cap removing jig 1 is gripped so that the lower end opening 6 is on the lower side (step S2). Further, in order to substantially fix the pulley unit 101 so that it does not move upward when the protective cap 105 is removed, the upper surface of the pulley 102 of the pulley unit 101 is used by the hand not holding the protective cap removing jig 1. The side surface of the pulley on the bolt shaft 103 side or the upper surface of the alignment plate 122 corresponding to the portion is pressed from above.

  Next, the lower end opening 6 is positioned above the protective cap 105 with respect to the protective cap 105 of the pulley unit 101 to be removed, and the protective cap removing jig 1 is pushed into the lower protective cap 105 as it is. (FIG. 5A, FIG. 5B, step S3). When the protective cap 105 is inserted into the lower end opening 6 by the pressing operation of the protective cap removing jig 1, the protective cap 105 includes the taper portion 20 formed on the clamping claw 8 of the engaging arm 3 and the jig main body 2. The convex portion 106 of the protective cap 105 and the like are guided and contacted by the guide taper 15 formed in the guide tape 15, and is inserted from the lower end opening 6 toward the hollow portion 9.

  Specifically, the taper portion 20 forms a slope that expands from the top to the bottom at the tip of the opposing clamping claw 8, and the maximum widening diameter 26 at the lower end of the taper portion 20 is protected. The minimum expanded diameter 27 at the upper end is larger than the outer diameter of the cap 105 and smaller than the outer diameter of the protective cap 105. By configuring in this way, the tapered portion 20 formed by facing the left and right nail claws 8 has a protective cap as shown in FIG. 5A when the jig body 2 is pushed down toward the protective cap 105. The outer peripheral surface of 105 is easily inserted into the maximum expanded diameter portion 28 at the lower end of the tapered portion 20, and then the left and right engaging arms 3 are expanded by further pressing down the jig body 2, so that the tapered portion 20 The protective cap 105 is tightly attached between the left and right clamping claws 8 while pushing the minimum expanded diameter portion 29 at the upper end (see FIG. 5B).

  Further, the urging portion 4 includes virtual annular first and second concave grooves 16 and 17 in which two O-rings 13 are formed in parallel adjacent to predetermined positions of the jig body 2 and the engagement arm 3. Since the urging portion 4 is fitted to the end of the engagement arm 3, the engagement arm 3 is pivotally connected so that one end of the engagement arm 3 is integrated with the jig body 2. There is a high degree of freedom in the operation of opening or closing the holding claws 8. That is, since the O-ring 13 surrounded by the outer periphery of the engagement arm 3 can be opened and closed in the outer peripheral direction of the jig body 2, the upper end of the engagement arm 3 is pivotally supported by the outer peripheral wall of the jig body 2. Compared to the structure to be constructed, there is no specific operation fulcrum, and even if the operation of the engagement arm 3 is shaken or the amplitude operation of the left and right engagement arms 3 is different, the expansion / contraction operation of the engagement arm 3 is performed. It is performed smoothly and the grip of the protective cap 105 can be reliably performed. Therefore, when the lower end opening 6 side of the protective cap removing jig 1 is inserted into the protective cap 105, the axial direction of the jig body 2 and the axial direction of the bolt shaft 103 of the pulley unit 101 are not necessarily exactly the same axial center. Even if they do not coincide with each other, the lower end opening 6 can be changed from the throttled state to the open state by the clamping claws 8, and the engagement arm 3 can be flexible within the range allowed for the expanded state of the O-ring 13. It can be opened and closed.

  In the protective cap removal jig 1 according to the present embodiment, the upper end of the engagement arm 3 is pivotally connected to the peripheral wall of the jig body 2 so as to be opened and closed around the pivot. The opening / closing operation similar to the structure of the urging portion 4 in which the O-ring is fitted into the first and second concave grooves 16 and 17 of the virtual annular shape can be performed.

  Further, by pushing the protective cap 105 into the jig body 2 against the urging force of the urging portion 4, the clamping claw 8 is positioned below the bottom surface 108 of the protective cap 105. In this case, the entire protective cap 105 is accommodated in the lower end opening 6 (FIG. 5C), and the engaging arm 3 is closed again by the urging force. Can be engaged with the bottom portion 107.

  Specifically, when the jig body 2 is further pushed down, the minimum expanded diameter portion 29 formed at the upper ends of the tapered portions 20 of the left and right clamping claws 8 passes through the protective cap 105 and reaches the screw portion 104 to be protected. The state reaches the bottom 107 of the cap 105 and supports the bottom 107 of the protective cap 105 from below.

  Next, in order to remove the protective cap 105 from the bolt shaft 103, the protective cap removing jig 1 is pulled up above the protective cap 105 in the substantially axial direction of the bolt shaft 103 (FIG. 5 (d), step S4). . In this case, the engaging surface 21 that is the inner surface of the clamping claw 8 and the bottom surface 108 of the protective cap 105 come into contact with each other, and the protective cap 105 is removed from the bolt shaft 103 by the pressing action that the engaging surface 21 pulls the bottom surface 108 upward. be able to.

  The protective cap 105 pulled away from the bolt shaft 103 is accommodated in the lower hollow portion 22 of the protective cap removing jig 1. Since the inner diameter of the lower hollow portion 22 is substantially the outer diameter of the bottom portion 107 which is the maximum outer diameter of the protective cap 105 or slightly smaller, the removed protective cap 105 has a lower hollow shape due to the elastic characteristics of the protective cap 105. An urging force is applied to the wall surface of the portion 22 to be held in the lower hollow portion 22.

  For one pulley unit 101, the protective cap 105 can be easily removed from the bolt shaft 103 by performing the above-described processing. Further, when there is a pulley unit 101 to be removed from the protective cap 105, the process returns to step S3 and the series of processing up to step S5 is repeated. By repeating this operation, the removed protective caps 105 are successively stored in a stacked state in the hollow portion 9 in the jig body 2.

  That is, in step S <b> 3, as shown in FIG. 6, the protective cap 105 a that has already been removed is held in the lower hollow portion 22. When the protective cap 105b to be removed next is inserted from the lower end opening 6, the convex portion 106 of the next protective cap 105b is inserted from the opening on the bottom 107 side of the previous protective cap 105a to the inside. At the same time, the next protective cap 105 b presses the previous protective cap 105 a upward, so that the previous protective cap 105 a moves upward in the lower hollow portion 22. Therefore, when the next protective cap 105b is removed from the bolt shaft 103 in step S4, the next protective cap 105b is replaced and held at a predetermined position of the hollow portion 9 where the previous protective cap 105a was originally located. It will be.

  In the protective cap removal jig 1 according to the present embodiment, the height of the lower hollow portion 22 in the axial direction is approximately two heights of the protective cap 105, so that the third protective cap 105 is a bolt shaft. When it is removed from 103, the first protective cap 105 a moves further upward and reaches the upper hollow portion 23. Since the inner diameter of the upper hollow portion 23 is slightly larger than the outer diameter of the bottom portion 107 which is the maximum outer diameter of the protective cap 105, the first protective cap 105a is pressed from any direction in the upper hollow portion 23. It will be received in the upper hollow part 23 in a free state.

  In the protective cap removing jig 1 according to this embodiment, 16 protective caps 105 can be accommodated in the upper hollow portion 23. Accordingly, during the process of removing the plurality of protective caps 105, if the upper end opening 7 side of the protective cap removal jig 1 is directed downward, the plurality of protective caps 105 accommodated in the upper hollow portion 23 are upper hollow. Since it can drop sequentially from the part 23, the removed protective cap can be taken out easily.

  The processing from step S3 to step S5 is repeated, and when there is no pulley unit 101 to be processed next, a series of processing of the protective cap removing operation is ended.

  Further, when the protective cap 105 accommodated in the lower hollow portion 22 is taken out, a rod-like object (not shown) or the like that can be inserted into the lower end opening 6 is pushed into the inner side from the lower end opening 6 side, and the protective cap 105 is inserted. , The protective cap 105 can be taken out by turning the upper end opening 7 downward.

  Note that the method of removing the protective cap 105 using the protective cap removing jig 1 according to the present embodiment is not intended to remove only the protective cap 105 covering the bolt shaft 103 protruding upward from below. . For example, for a protective cap covering a bolt shaft protruding in the floor direction from the ceiling of a building, the method described above by pushing the protective cap removing jig 1 into the protective cap 105 with the lower end opening 6 facing upward. Similarly, the protective cap 105 can be removed. In this case, since the removed protective cap 105 falls to the floor surface from the upper end opening 7 of the jig 1 facing downward, the upper end opening 7 is provided with a lid (not shown), It is desirable to arrange a storage part (not shown) in the vicinity of the upper end opening 7.

  As described above, the protective cap removing jig 1 according to this embodiment is used. The removal of the protective cap 105 is performed by pressing the bottom surface 108 of the protective cap 105 substantially vertically upward toward the convex portion 106 side by the engaging surface 21 of the clamping claw 8. There is no need to hold the middle part of the protective cap 105 during removal. Therefore, the inner wall of the protective cap 105 does not bite into the thread, and the protective cap 105 can be easily and efficiently removed in a short time by only the up and down movement of the protective cap removing jig 1. Further, the worker's fatigue required to remove the protective cap 105 is small, and the burden on the worker can be greatly reduced as compared with the conventional work using a tool such as the pliers 110.

  Further, since the protective cap 105 is not damaged when the protective cap 105 is removed, the protective cap 105 can be reused, which is environmentally and economically advantageous.

  Further, the removed protective cap 105 can accommodate a certain amount in the hollow portion 9 of the protective cap removing jig 1, and the plurality of accommodated protective caps 105 can be easily set simply by turning the jig 1 upside down. Can be taken out. Therefore, the removed protective cap 105 can be easily stored in a predetermined storage place without causing a work burden during the removal work of the protective cap 105, and the protective cap 105 is not scattered in the work place. Work can be continued while maintaining.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the specific embodiment. For example, the number of the engagement arms 3 may be one or three or more. Various modifications and changes can be made within the scope of the gist of the present invention described in the above.

DESCRIPTION OF SYMBOLS 1 Protective cap removal jig | tool 2 Jig body 3 Engagement arm 5 Gripping part 6 Lower end opening part 8 Claw nail | claw 9 Hollow part 13 Elastic ring (O-ring)
22 Lower hollow portion 23 Upper hollow portion 105 Protective cap 107 Bottom portion 109 Screw head

Claims (4)

A plurality of vertical engagement arms whose lower ends can be freely opened and closed are mounted on the lower outer peripheral surface of a hollow cylindrical jig body having the upper half as a gripping portion,
The lower end of the engagement arm is configured as a substantially L-shaped holding claw so that the lower end opening of the jig body can be squeezed or opened by opening and closing the clamping claw,
By cooperation of the pressing operation of the jig body and the opening operation of the clamping claws,
A protective cap attached to the screw head can be inserted into the lower end opening of the jig body, and
The bottom portion of the protective cap inserted into the lower end opening of the jig body by the closing operation of the clamping claw can be lifted,
A protective cap removing jig configured to lift and remove the protective cap from the screw head by a lifting operation of the jig body.   The protective cap removing jig according to claim 1, wherein an elastic link is surrounded on an outer periphery of the engagement arm to urge the engagement arm to be freely opened and closed.   The protective cap removing jig according to claim 1, wherein the hollow portion of the jig main body is configured to be able to store the protective caps removed from the screw heads by stacking them from below. The hollow portion of the jig body has an inner diameter of the lower hollow portion as a substantially outer diameter of the protective cap,
By making the inner diameter of the upper hollow part above it further larger than the inner diameter of the lower hollow part,
The protective cap removing jig according to claim 3, wherein the protective cap removed in the hollow portion of the jig body is easily removed.

Images