Lock pin

Abstract

To provide a lock pin whose head is hard to be ejected by vibration while facilitating insertion / removal.SOLUTION: A lock pin 1 is a lock member which is inserted through an insertion hole communicating with engaged two members to block disengagement and comprises a head 10 and a pin-shaped insertion part 20 which is bent in the same direction in two locations within the same plane. In the insertion part 20, a portion from a proximal end at the side of the head 10 to a first bent portion 21 is defined as a neck 23; a portion from the first bent portion 21 to a second bent portion 22 is defined as a shank 24; and a portion from the second bent portion 22 to a distal end is defined as a foot 25. An angle formed between the head 10 and the neck 23 is 90°. When an angle of the first bent portion 21 is defined as A, an angle of the second bent portion 22 is defined as B and an angle formed between straight lines in parallel with the foot 25 and the neck 23 is defined as C, relations of A≥100°, B≥100°, C≥100°, A+B+C=360° and C>A are satisfied. Regarding a dimension of the insertion part inside of bending, a length L2 of the shank 24 and a length L3 of the foot 25 satisfy a relation of L2>L3, and the first bent portion 21 and the distal end of the foot 25 are proximate to rear faces of the two members.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present invention relates to a lock pin used to maintain the engaged state of engaged members. [Background technology]

[0002] One engagement structure for two members involves forming an engagement claw in one member and a hole in the other member that connects a large-diameter hole and a small-diameter hole, and the engagement claw is inserted into the large-diameter hole and slid into the small-diameter hole to engage with the small-diameter hole. Another method for maintaining the engagement between the two members involves providing insertion holes that communicate with both members and inserting a lock pin into these insertion holes to prevent sliding in the direction that would release the engagement.

[0003] The lock pin generally has an L-shaped pin-like insertion portion that is bent at an acute angle midway in the length direction and an integrated head portion for preventing it from coming out, and when the insertion portion is inserted into the communicating insertion hole, it drops down under its own weight and the head portion is locked into the member in a non-removable state, maintaining the engagement between the two members (see Figure 4). Because the lock pin is not fixed to either member, it can be attached and removed simply by inserting and removing it, and no tools are required.

[0004] An example of an article that uses a lock pin to maintain the engaged state is an assembly-type shelf in which front, rear, left, and right support posts are connected with beams and connecting materials to form a frame, and shelf boards are attached to the inside of this frame (see Non-Patent Document 1). In the assembly-type shelf in Non-Patent Document 1, a lock pin is used to maintain the connected state (engaged state) of the support posts and beams. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Product name: "Lightweight Boltless Rack," manufactured by Sanshin Metal Industry Co., Ltd., searched October 19, 2021, Internet <URL: https: / / dcs4.icata.net / iportal / CatalogViewInterfaceStartUpAction.do?method=startUp&mode=PAGE&volumeID=SMW00001&catalogId=892970000&pageGroupId=175&designID=SMWD01&catalogCategoryId=> Summary of the Invention [Problem to be solved by the invention]

[0006] Among the assembly-type shelving units are mobile shelving units that slide along rails installed on the floor. With mobile shelving units, the vibrations that occur when the shelving unit is moved can cause the locking pin to move and the head to pop out. While the engagement between the two components is maintained as long as the locking pin does not fall out of the insertion hole, the state in which the head pops out of the insertion hole is unsightly and undesirable, as it gives onlookers the feeling that the connection may come loose. [Means for solving the problem]

[0007] In view of the above-described technical background, the present invention provides a lock pin that is easy to insert and remove, but whose head is less likely to pop out due to vibration.

[0008] That is, the lock pin of the present invention has the configurations described in the following [1] to [4].

[0009] [1] A locking member that prevents movement in the direction of disengagement by being inserted into an insertion hole that communicates with two members that are overlapped and slid to engage, a head portion and a pin-shaped insertion portion that protrudes from the rear surface of the head portion and is bent in the same direction at two points in the length direction within the same plane; The insertion portion has a neck portion from the base end on the head side to the first bent portion, a trunk portion from the first bent portion to the second bent portion, and a foot portion from the second bent portion to the tip, The angle between the back surface of the head and the neck of the insertion part is 90°, When the angle of the first bent portion is A, the angle of the second bent portion is B, and the angle formed by a line parallel to the foot portion and the neck portion is C, the relationships A ≥ 100°, B ≥ 100°, C ≥ 100°, A + B + C = 360°, and C > A are satisfied, A lock pin characterized in that, in the dimensions on the inside of the bend of the insertion portion, the length L2 of the body portion and the length L3 of the foot portion satisfy the relationship L2 > L3, and the first bent portion and the tip of the foot portion are close to the back surfaces of two members.

[0010] [2] The length L1 of the neck on the inside of the bend of the insertion part, and the distance L4 from the tip of the foot to the plane including the back surface of the head Toga 2. The lock pin according to claim 1, wherein the lock pin is substantially equal to the lock pin.

[0011] [3] The distance L4 is 5 mm or less. 2 The lock pin according to claim 1.

[0012] [4] The lock pin according to any one of the preceding paragraphs 1 to 3, wherein a distance L5 from the inside of the bend of the neck portion to the tip of the foot portion is 20 mm to 50 mm. [Effects of the Invention]

[0013] The lock pin described in [1] above has two bent portions of the insertion portion that form an obtuse angle of 100° or more, allowing it to be easily inserted into and removed from an insertion hole communicating with two engaged components. Furthermore, the angle A of the first bent portion and the angle C formed by a line parallel to the foot and neck satisfy the relationship C > A, and the length L2 of the body and the length L3 of the foot satisfy the relationship L2 > L3. This increases the rotational moment on the insertion portion side and lowers the center of gravity, allowing the back surface of the head to abut against the engaged component, thereby assuming a locked position that prevents entry. Furthermore, in this locked position, the first bent portion and the tips of the foot portions are close to the back surface of the engaged component, making it difficult for the head to pop out even when subjected to vibration, etc.

[0014] The lock pin described in [2] above has a length L1 of the neck and a distance L4 from the tip of the foot to the plane including the back surface of the head. Toga Since they are nearly equal, in the locked position the tips of the first bent portion and the foot portion can be brought into contact with the engaged member or as close as possible to the engaged member, which is highly effective in preventing the head from jumping out.

[0015] The lock pin described in [3] above has the distance L4 of 5 mm or less, and is suitable for engaging and holding members with a total thickness of 5 mm or less.

[0016] The lock pin described in [4] above has a distance L5 from the neck to the tip of the foot on the inside of the bend of 20 mm to 50 mm, making it easy to handle when pinching with the fingertips to insert or remove. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view of one embodiment of a locking pin of the present invention. [Figure 2A] FIG. 2 is a side view of the lock pin of FIG. 1. [Figure 2B] FIG. 2 is a front view of the lock pin of FIG. 1. [Figure 2C] FIG. 2 is a rear view of the lock pin of FIG. 1. [Figure 2D] FIG. 2 is a plan view of the lock pin of FIG. 1. [Figure 2E] FIG. 2 is a bottom view of the lock pin of FIG. 1. [Figure 3] 2 is a cross-sectional view showing the locking position of the lock pin in FIG. 1. FIG. [Figure 4] FIG. 10 is a cross-sectional view showing the locked position of a conventional lock pin. [Figure 5] 1A and 1B are a front view and a plan view of an assembly type bookshelf using a lock pin. [Figure 6] FIG. 6 is an enlarged view of a main part of FIG. 5. [Figure 7] FIG. 7 is a side view of FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0018] 1 to 3 show an embodiment of the lock pin of the present invention.

[0019] The lock pin 1 has a disk-shaped head 10 with a truncated cone and an insertion part 20 that protrudes at a right angle from a back surface 11 of the head 10, and these are integrated together.

[0020] As shown in Fig. 3, the lock pin 1 is a member for maintaining a state in which a second member 102 is overlapped and engaged with a first member 101 arranged vertically. The first member 101 and the second member 102 are engaged by an engaging means (not shown), and the illustrated engaged posture is maintained even without the lock pin 1. The first member 101 and the second member 102 each have insertion holes 103 and 104 that communicate with each other when engaged, and the insertion portion 20 of the lock pin 1 is inserted from one of the member sides into the insertion holes 103 and 104 that are communicated by engaging both members 101 and 102, and the head 10 prevents entry. Fig. 3 shows an example in which the lock pin 1 is inserted from the second member 102 side.

[0021] In the following description, "the first member and the second member in a state in which the second member is engaged with the first member" may be abbreviated to "both members in an engaged state" or "both members."

[0022] The insertion portion 20 of the lock pin 1 is a pin with a circular cross section and a smaller diameter than the head portion 10. The head portion 10 is the base end and is bent in the same direction at two locations along its length within the same plane. The base end of the insertion portion 20 is designated as a first bent portion 21, and the tip end is designated as a second bent portion 22. The portion from the base end to the first bent portion 21 is designated as a neck portion 23, the portion from the first bent portion 21 to the second bent portion 22 is designated as a trunk portion 24, and the portion from the second bent portion 22 to the tip is designated as a foot portion 25. Bending within the same plane refers to a state in which the axis of the insertion portion 20 exists within a single plane, and the insertion portion 20 is linear and untwisted in front and rear views (see FIGS. 2B and 2C). Bending in the same direction refers to a state in which the first bent portion 21 and the second bent portion 22 form an angle of less than 180° on the same side of the insertion portion 20, and there is no twist in side view (see FIG. 2A).

[0023] Diameter D3 of insertion portion 20 of lock pin 1 is smaller than the diameter of insertion holes 103, 104 of both members 101, 102 in the engaged state, and is set to a dimension that allows first bent portion 21 and second bent portion 22 of insertion portion 20 to pass through insertion holes 103, 104. On the other hand, diameter D1 of head portion 10 is larger than the diameter of insertion holes 103, 104, and back surface 11 of head portion 10 abuts against second member 102, thereby preventing lock pin 1 from entering.

[0024] The insertion portion 20 of the lock pin 1 of the present invention is required to satisfy the relationships A ≥ 100°, B ≥ 100°, C ≥ 100°, A + B + C = 360°, and C > A, where A is the angle between the neck portion 23 and the body portion 24, i.e., the angle of the first bent portion 21, B is the angle between the body portion 24 and the foot portion 25, i.e., the angle of the second bent portion 22, and C is the angle between the foot portion 24 and a line parallel to the neck portion 23.

[0025] As shown in FIG. 2A, plane α including neck 23, body 24, foot 25, and back surface 11 of head 10, and a line passing through the tip of foot 25 and parallel to neck 23 form a pentagon, and the angle between back surface 11 of head 10 and neck 23 is 90°, and the angle between plane α and a line passing through the tip of foot 25 and parallel to neck 23 is also 90°. Therefore, angles A, B, and C always satisfy the relationship A+B+C=360°.

[0026] In addition, the longitudinal dimensions of the neck 23, body 24, and foot 25 of the insertion portion 20 are defined by the dimensions on the inside of the bend of the insertion portion 20 (see Figure 2A), and the lengths of the neck 23, body 24, and foot 25 are L1, L2, and L3, respectively.

[0027] In the lock pin 1 of the present invention, the length L2 of the body 24 is longer than the length L3 of the foot 25, and the relationship L2 > L3 must be satisfied. By satisfying L2 > L3, the center of gravity of the insertion portion 20 is lowered. Therefore, when the first bent portion 21 passes through the insertion holes 103 and 104, the rotation moment on the insertion portion 20 side is increased and the center of gravity is lowered, causing the back surface 11 of the head 10 to abut against the second member 102 and assume a locked position. As long as L2 > L3 is satisfied, there are no limitations on the ratio of the lengths of the body 24 and the foot 25, but it is preferable that L2 / L3 be 1.1 to 2.0. Furthermore, in this locked position, the foot 25 faces the first member 101 and is in close proximity to the first member 101.

[0028] Because the neck portion 23 is located within the insertion holes 103, 104 in the locked position, its length L1 is set in accordance with the total thickness of both members 101, 102. Specifically, it is preferably set to a dimension equal to or slightly longer than the total thickness of both members 101, 102; for example, to enhance versatility, it is preferably set to be longer than the total thickness by 0 mm to 1.5 mm. By setting L1 to a dimension in accordance with the total thickness of both members 101, 102 in this way, the first bent portion 21 is brought into close proximity with the back surface of the first member 101 in the locked position. Note that, because a radius is formed in the first bent portion 21 during bending of the insertion portion 20 of the lock pin 1, the length L12 of the straight portion of the length L1 of the neck 23 should be set in light of the total thickness of both members 103, 104.

[0029] Furthermore, it is preferable that the length L1 of the neck portion 23 and the distance L4 from the tip (the tip on the inner side of the bend) of the foot portion 25 to the plane α including the back surface of the head portion 10 are approximately equal. If the first bent portion 21 is curved, the length L12 of the straight portion of the length L1 of the neck portion 23 and the distance L4 are set to be approximately equal. Here, "approximately equal" between L1 (or L12) and L4 means that the difference between them is within approximately 1 mm and L4 is long. With such dimension settings, the tips of the first bent portion 21 and the foot portion 25 come into contact with or as close as possible to the back surface of the first member 101 in the locked position.

[0030] Although the present invention does not limit the actual dimensions of each part of the lock pin 1, the above-mentioned distance L4 is preferably 5 mm or less, and more preferably 3 mm to 5 mm. As described above, the distance L4 is preferably approximately equal to the length L1 (or L12) of the neck portion 23, and therefore corresponds to the total thickness of both members 101, 102 in the engaged state. In other words, the lock pin 1 of the present invention is particularly suitable for engaging and holding members with a total thickness of 5 mm or less. Furthermore, the distance L5 from the neck portion 23 to the tip of the foot portion 25 on the inside of the bend is preferably in the range of 20 mm to 50 mm, a dimension that makes it easy to handle when holding it with your fingertips to insert or remove it.

[0031] In lock pin 1 having a shape that satisfies the above-described conditions, two bent portions 21, 22 form an obtuse angle of 100° or more, so that insertion portion 20 can be inserted into insertion holes 103, 104 and easily pass through first bent portion 21 and second bent portion 22. Similarly, when removing lock pin 1 in the opposite direction, first bent portion 21 and second bent portion 22 can easily pass through. Therefore, lock pin 1 is easy to insert and remove.

[0032] Furthermore, since the length L2 of the body 24 of the insertion portion 20 is longer than the length L3 of the foot portion 25, when the insertion portion 20 is passed through the insertion holes 103, 104 of the two engaged members 101, 102, the rotational moment on the insertion portion 20 side becomes large and the center of gravity lowers, so that the back surface 11 of the head 10 abuts against the second member 102, thereby assuming a locked position that prevents insertion.

[0033] In the locked position, the first bent portion 21 is close to the back surface of the first member 101, and the tip of the foot portion 25 is close to and facing the back surface of the first member 101, so even if the head 10 is subjected to vibration or the like and tries to move in a direction away from the second member 102, the tip of the first bent portion 21 and the tip of the foot portion 25 come into contact with the back surface of the first member 101 and prevent the movement, preventing the head 10 from jumping out. In particular, when the length L1 of the neck portion 23 and the distance L4 are approximately equal, in the locked position, the tip of the foot portion 25 is close to the first member 102 and faces the back surface of the first member 101. 101 Since the head 10 can be brought into contact with or as close as possible to the rear surface of the head 10, it is highly effective in preventing the head 10 from jumping out.

[0034] The lock pin 1 of the present invention can be used with any member whose total thickness of both members 101, 102 is the same as or smaller than the length L1 (or L12, hereinafter the same) of the neck 23; the larger L1 is, the wider the range of applicable members and the greater its versatility. However, on the other hand, the greater the difference between L1 and the total thickness of both members 101, 102, the further away the tips of the first bent portion 21 and foot portion 25 are from the back surface of the first member 101 in the locked position, reducing the effectiveness of preventing the head 10 from popping out. For this reason, the lock pin 1 of the present invention can maximize the effectiveness of preventing the head 10 from popping out by specifying the members 101, 102 to be used and making the length L1 of the neck 23 as close as possible to their total thickness, or by expanding the range of applicable members and thereby achieving greater versatility.

[0035] FIG. 4 shows a conventional L-shaped lock pin 2, in which the insertion portion 30 is bent at one location to form a neck portion 31 and a foot portion 32. In the L-shaped lock pin 2, in order to point the tip of the foot portion 32 toward the back surface of the first member 101 in the locked position, the bent portion 33 must be set at an acute angle. To form the bent portion 33 at an acute angle, the neck portion 31 must be lengthened to move the bent portion 33 away from the back surface of the first member 101. For this reason, in the L-shaped lock pin 2, the bent portion 33 cannot be brought close to the back surface of the first member 101, and the head portion 40 is prone to pop out when subjected to vibrations, etc.

[0036] Unlike the L-shaped lock pin 2, the lock pin 1 of the present invention has a first bent portion 21 that forms an obtuse angle of 100° or more. This allows the length L1 of the neck portion 23 to be the same as or slightly longer than the total thickness of both members 101, 102, and allows the first bent portion 21 to be close to the back surface of the first member 101 in the locked position. Furthermore, the tip of the foot portion 25 can also be close to the back surface of the first member 101. As a result, the head portion 10 is less likely to pop out even when subjected to vibrations, etc. Moreover, because the two bent portions 21, 22 of the insertion portion 20 form an obtuse angle of 100° or more, the insertion portion 20 easily passes through the insertion holes 103, 104, facilitating insertion and removal. [Example of lock pin dimensions] Examples of dimensions of the lock pin 1 in FIGS. 1 to 3 are as follows:

[0037] The head 10 is circular with a diameter D1 of 12.5 mm, and has a truncated cone portion 12 protruding from the center with a diameter D2 of 7.5 mm.

[0038] The insertion portion 20 is pin-shaped with a diameter D3 of 6 mm, the first bent portion 21 is formed with a radius of 8 mm, and the second bent portion 22 is also formed with a radius of 8 mm. The angle A of the first bent portion 21 is 110°, and the angle B of the second bent portion 22 is 127°. The angle C formed by the foot portion 25 and a line parallel to the neck portion 23 is 123°. The length L1 of the neck portion 23 on the inside of the bend is 6.1 mm, the length L2 of the body portion 24 is 21.3 mm, and the length L3 of the foot portion 25 is 17.2 mm. neck 23 The straight portion L12 of the length L1 is 4 mm. The distance L4 from the tip of the foot portion 25 to the plane α including the back surface 11 of the head portion 10 is 4 mm. [Example of using a lock pin] The lock pin of the present invention can be used in any member, regardless of the type of member, as long as it is arranged vertically and has an insertion hole that communicates when engaged.

[0039] The knockdown racks in Figures 5 to 7 are examples of articles using the lock pin of the present invention. Figure 6 is an enlarged view of the part surrounded by the dashed line in Figure 5, and Figure 7 is a side view of Figure 6. The assembly rack is constructed by connecting the left and right ends of beams 60 by engaging them with the upper and lower ends of left and right support posts 50, and assembling a frame by connecting the front and rear support posts 50 with shelf supports 70, and attaching a plurality of shelf boards 80 to the inside of the left and right support posts 50 via the shelf supports 70. Of the components of this rack, lock pins 1 are used to maintain the engagement between the support posts 50 and beams 60.

[0040] The support pillar 50 is a bent metal plate, and is a hollow material with a square cross section. The support pillar 50 can form a frame on the left and right, and two sets of connecting holes are drilled on the left and right sides of the upper end of the front wall 51, and two sets of connecting holes are drilled on the left and right sides of the lower end. One set of connecting holes consists of one insertion hole 52 and two engagement holes 53 formed above and below the insertion hole 52, for a total of three holes. The engagement holes 53 are irregularly shaped holes that taper downward, with an upper inverted trapezoidal hole 53a that is larger in the left-right direction and a lower inverted trapezoidal hole 53b that is smaller in the left-right direction joined above and below.

[0041] The beam 60 is a bent metal plate product, and flat plate connecting portions 62 extend from the left and right ends of a main body portion 61 having a U-shaped cross section. 50 The connecting part 62 is assembled to the front wall 51 of the support 50 so as to overlap it, corresponding to the interior dimension of the space between them. An insertion hole 63 is drilled in the connecting part 62 approximately in the center in the vertical direction, and two engaging protrusions 64 are formed above and below the insertion hole 63, protruding from the back surface. The engaging protrusions 64 are inverted trapezoids whose left-right dimensions become smaller at the bottom.

[0042] A beam 60 is placed between the left and right support columns 50, the left and right connecting portions 61 of the beam 60 are placed on the front walls 51 of the support columns 50, the two engaging protrusions 64 are inserted into the upper holes 53a of the two engaging holes 53 of the support columns 50, and the beam 60 is pulled down until the engaging protrusions 64 engage with the lower holes 53b. As a result, the left and right connecting portions 61 of the beam 60 engage with the front walls 51 of the left and right support columns 50, and the insertion holes 63 of the beam 60 communicate with the insertion holes 52 of the support columns 50. Then, a lock pin 1 is inserted into the communicating insertion holes 63, 52 from the beam 60 side to assume a locked position, thereby maintaining the engagement between the support columns 50 and the beam 60.

[0043] The effect of the lock pin 1 in holding the engagement between the support pillar 50 and the beam 60, and the effect of preventing the head 10 from jumping out in the locked position, are as described above with reference to Figures 1 to 4. The support pillar 50 corresponds to the first member 101 in Figure 3, and the beam 60 corresponds to the second member 102. [Industrial Applicability]

[0044] The present invention is used to maintain the engaged state of engaged members. [Explanation of symbols]

[0045] 1...Lock pin 10...Head 11…Back side 20...Passage part 21...First bending part 22…Second bending part 23…Neck 24...Torso 25...foot 50...post 60...Beam 101...First member 102...Second member 103, 104...Through holes α...plane including the back surface of the head L1: Length of neck L2: Length of trunk L3: Foot length L4: Distance from the tip of the foot to the plane including the back of the head L5: Distance from the inside of the neck to the inside of the tip of the foot A: Angle of the first bend B: Angle of the second bend C: The angle between the foot and the neck

Claims

1. A locking member that prevents movement in a direction to release the engagement by being inserted into an insertion hole that communicates with two members that have been overlapped and slid and engaged, a head portion and a pin-shaped insertion portion that protrudes from the rear surface of the head portion and is bent in the same direction at two points in the length direction within the same plane; The insertion portion has a neck portion from the base end on the head side to the first bent portion, a trunk portion from the first bent portion to the second bent portion, and a foot portion from the second bent portion to the tip, The angle between the back surface of the head and the neck of the insertion part is 90°, When the angle of the first bent portion is A, the angle of the second bent portion is B, and the angle formed by a line parallel to the foot portion and the neck portion is C, the relationships A ≥ 100°, B ≥ 100°, C ≥ 100°, A + B + C = 360°, and C > A are satisfied, A lock pin characterized in that, in terms of dimensions on the inside of the bend of the insertion portion, the length L2 of the body portion and the length L3 of the foot portion satisfy the relationship L2 > L3, and the first bent portion and the tip of the foot portion are close to the back surfaces of two members.

2. 2. The lock pin according to claim 1, wherein a length L1 of the neck portion on the inside of the bend of the insertion portion is approximately equal to a distance L4 from the tip of the foot portion to a plane including the back surface of the head portion.

3. The lock pin according to claim 2, wherein the distance L4 is 5 mm or less.

4. The lock pin according to any one of claims 1 to 3, wherein a distance L5 from the inside of the bend of the neck portion to the tip of the foot portion is 20 mm to 50 mm.

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