JP2013137902A - Fitting jig, plug connector engaging therewith, and fitting method using fitting jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting jig which allows for easy fitting of a plug connector 30 to a mating connector, even if the fitting space is limited, and to provide a fitting method.SOLUTION: By using a fitting jig 10 having engaging means 12 engaging with a mating connector (socket connector 50) and locking means locking to a plug connector 30, the locking means 14 of the fitting jig 10 and second locking means 383 of the plug connector 30 are locked, the engaging means 12 of the fitting jig 10 is engaged with the socket connector 50, and then the fitting jig 10 is rotated thus fitting the plug connector 30 and the socket connector 50.

Description

  The present invention relates to a plug connector used for communication equipment and electric equipment of a mobile phone base station and a mobile base station, and particularly when the plug connector is fitted to a mating connector in a narrow space. The present invention relates to a fitting method that can be combined, a fitting jig used in the method, and the structure of the plug connector.

Generally, as a method of fitting a plug connector to a mating connector (socket connector, receptacle connector, adapter, etc.), a coupling having a fitting means such as a screw that can be rotated is attached to the plug connector, The plug connector and the mating connector are fitted together by screwing the coupling screw or the like into the mating connector.
The following is a list of coaxial connectors using couplings already proposed by the applicant. Patent document 1 (Japanese Patent Laid-Open No. 2007-42415) is cited as a document proposed by the present applicant.
According to the summary of Japanese Patent Application Laid-Open No. 2007-42415, an object is to provide a coaxial connector that can maintain the waterproofness of the connector with a simple structure, can be miniaturized, does not lead to poor connection, and does not increase costs. A central conductor 12 having a contact portion 121 that contacts a counterpart, a fixing portion 122 held by the insulator 14, and a connection portion connected to a substrate or a cable, an insulator 14 that holds the central conductor 12, and the insulator 14 And a body 18 having an opening into which the counterpart is inserted, a coupling 18 rotatably attached to the body main body 16 and having a threaded portion with the counterpart, and fitting with the counterpart The gasket 20 is provided to enhance the waterproofness at the time, and the gasket 20 is held between the counterpart and the coupling 18 when mated with the counterpart. Inner portion coaxial connector structure which can be achieved by pressing is disclosed in the main body 16 together with the.

  In recent years, as communication devices, electrical devices, electronic devices, and the like have been downsized, and connectors have been downsized, the space for fitting the plug connector to the mating connector has also been narrowed. While the space is narrowing, it is said that the coupling structure described in Patent Document 1 cannot be rotated by inserting a hand and the plug connector and the mating connector cannot be fitted. There was a problem.

  The present invention has been made in view of such conventional problems, and a fitting jig and a fitting method capable of easily fitting a plug connector to a mating connector even when a fitting space is narrowed. A plug connector having a structure capable of being locked with the fitting jig is provided.

  This object is characterized in that, as described in claim 1, it has an engaging means for engaging with the mating connector on one end side, and has an engaging means for engaging with the plug connector at a predetermined position. This can be achieved by a fitting jig.

  The fitting jig according to claim 2 is the fitting jig according to claim 1, wherein the shape of the locking means is a gear shape.

  Further, the present object is a plug connector that is detachably fitted to the mating connector, as described in claim 3, and has a fitting means that fits the mating connector by rotating, By providing a second locking means for locking with the locking means on the member having the fitting means, locking the locking means and the second locking means, and rotating the fitting jig This can be achieved by a plug connector that is fitted with the mating connector.

  The plug connector according to claim 4 is the plug connector according to claim 3, wherein the shape of the second locking means is a gear shape.

  Furthermore, this object is a method for fitting a plug connector and a mating connector as claimed in claim 5, wherein the engaging means of the fitting jig and the second engaging means of the plug connector are engaged. And engaging the engagement means of the fitting jig with the mating connector and rotating the fitting jig to fit the plug connector and the mating connector. This can be achieved by a combined method.

  The fitting method according to claim 6 is the fitting method according to claim 5, wherein the shape of the locking means and the second locking means is a gear shape.

As is apparent from the above description, according to the fitting jig of the present invention, the plug connector engaged with the fitting jig, and the fitting method using the fitting jig, the following excellent effects are obtained. can get. With this mating jig, the plug connector that engages with the mating jig, and the mating method using the mating jig, the plug connector and mating connector can be easily mated even if the mating space is reduced. And a stable connection can be obtained.
(1) The fitting jig according to claim 1 has an engaging means for engaging with the mating connector at one end side, and a locking means for locking with the plug connector at a predetermined position. Thus, even if the space for fitting is reduced, the plug connector and the mating connector can be easily fitted, and a stable connection can be obtained.
(2) The fitting jig according to claim 2 is the fitting jig according to claim 1, wherein the shape of the locking means is a gear shape. Even if it is narrowed, the plug connector and the mating connector can be easily fitted, a stable connection can be obtained, and the plug connector and the fitting jig can be easily locked.

(3) The plug connector according to claim 3, wherein the plug connector is detachably fitted to the mating connector, and has a fitting means for mating with the mating connector by rotating. The member having the means is provided with second locking means for locking with the locking means, the locking means and the second locking means are locked, and the mating jig is rotated to rotate the mating member. Since the plug connector is characterized by being fitted with the connector, the plug connector and the mating connector can be easily fitted even when the fitting space is narrowed, and a stable connection can be obtained. .
(4) Since the plug connector according to claim 4 is the plug connector according to claim 3, wherein the shape of the second locking means is a gear shape, the space for fitting is narrowed. However, the plug connector and the mating connector can be easily fitted, a stable connection can be obtained, and the plug connector and the fitting jig can be easily locked.

(5) The fitting method according to claim 5 is a fitting method between the plug connector and the mating connector, and locks the locking means of the fitting jig and the second locking means of the plug connector. Engaging the engagement means of the fitting jig with the mating connector, and rotating the fitting jig to fit the plug connector and the mating connector. Since the method is adopted, even if the space for fitting is reduced, the plug connector and the mating connector can be easily fitted, and a stable connection can be obtained.
(6) The fitting method according to claim 6 is the fitting method according to claim 5, wherein the shape of the locking means and the second locking means is a gear shape. Even if the space for joining is reduced, the plug connector and the mating connector can be easily fitted, a stable connection can be obtained, and the plug connector and the fitting jig can be easily locked.

(A) It is the perspective view which looked at the jig | tool for fitting from the one end direction. (B) It is the perspective view which looked at the plug connector from the fitting direction. (B) It is the perspective view which looked at the other party connector (socket connector) from the fitting direction. (A) It is a perspective view of the jig for fitting, a plug connector, and a mating connector (socket connector) before fitting. (B) It is a perspective view in the state where the fitting jig was engaged with the plug connector and the fitting jig was engaged with the mating connector (socket connector) after fitting. (A) It is the perspective view which looked at the coupling of the plug connector from the fitting direction. (B) It is sectional drawing which cut the coupling of the plug connector in the center part. (A) It is the perspective view which looked at the body of the other party connector (socket connector) from the fitting direction. (B) It is the perspective view which looked at the screw inserted in the body of the other party connector (socket connector) from the head direction.

The feature of the present invention is that the engaging means 12 for engaging with the mating connector (socket connector 50) is provided at one end side, and the engaging means 14 for engaging with the plug connector 30 is provided at a predetermined position. The fitting jig 10 is
A feature of the present invention is a method of fitting the plug connector 30 and the mating connector (socket connector 50), and the locking means 14 of the fitting jig 10 and the second locking means of the plug connector 30. 383, the engagement means 12 of the fitting jig 10 is engaged with the mating connector (the socket connector 50), and the fitting jig 10 is rotated, The mating method includes mating the mating connector (the socket connector 50).
Further, the present invention is characterized in that the plug connector 30 is detachably fitted to the mating connector (the socket connector 50), and is fitted to the mating connector (the socket connector 50) by rotating. A second engaging means 383 for engaging with the engaging means 14 is provided on the member having the engaging means 382, and the engaging means 14 and the second engaging means 383 are engaged with each other. The plug connector 30 is characterized in that the plug connector 30 is engaged with the mating connector (socket connector 50) by stopping and rotating the fitting jig 10.
That is, the engagement jig 10 having the engagement means 12 that engages with the mating connector (the socket connector 50) and the engagement means that engages the plug connector 30 is used to lock the fitting jig 10. The means 14 and the second locking means 383 of the plug connector 30 are locked, the engaging means 12 of the fitting jig 10 is engaged with the mating connector (the socket connector 50), and the fitting jig is engaged. By rotating the tool 10, the plug connector 30 and the mating connector (the socket connector 50) are fitted together.

1A is a perspective view of the fitting jig as viewed from one end direction, FIG. 1B is a perspective view of the plug connector as viewed from the fitting direction, and FIG. 1C is a perspective view of the mating connector from the fitting direction. FIG. FIG. 2A is a perspective view of a fitting jig, a plug connector, a mating connector, and a screw before mating, and FIG. It is a perspective view in the state where the fitting jig was engaged with the mating connector. FIG. 3A is a perspective view of the coupling as viewed from the fitting direction, and FIG. 3B is a cross-sectional view of the coupling taken along the center portion. 4A is a perspective view of the body of the mating connector (socket connector) viewed from the mating direction, and FIG. 4B is a screw inserted into the body of the mating connector (socket connector) (however, the screw portion is omitted). Is a perspective view seen from the head direction.
The electrical connector 20 of this embodiment includes the plug connector 30 and the socket connector 50, and the plug connector 30 has at least one terminal, at least one insert, a body 36, and a coupling 38. The socket connector 50 includes at least one terminal 54, at least one insert 52, and a body 56.

  First, the fitting jig 10 which is the point of the present invention will be described. The fitting jig 10 has a substantially rod-like shape. The engaging means 12 engages with the socket connector 50 (mating connector) on one end side, the operating portion 16 operates by hand on the other end side, and the engaging means. 12 and the operating portion 16 are provided with locking means 14 for locking with the plug connector 20. The fitting jig 10 is made of metal and is manufactured by a known cutting technique. The material is required to have weather resistance, strength, workability, and the like, and examples thereof include stainless steel and steel.

  The operation unit 16 is somewhat thicker than other parts so that it can be easily held by hand, and is often covered with rubber or the like so as not to injure the hand. The shape and size of the operation unit 16 are easy to hold and are appropriately designed in consideration of operability, workability, strength, and the like. In the present embodiment, in order to make it difficult to slip, it is made flat or knurled.

  The engaging means 12 only needs to be able to engage with the socket connector 50, and the shape thereof is formed so as to follow the counterpart. For example, if the counterpart is a hole, the cylinder enters the hole, and if the counterpart is a groove on the screw head, the cylinder enters the groove. That is, the counterpart side may serve as a bearing for the engaging means 12, and the engaging means 12 may be engaged and rotated.

  The locking means 14 is a portion that locks with the plug connector 30, as long as it can be locked and the electric connector 20 can be fitted by rotating. The shape and size of the locking means 14 are appropriately designed in consideration of locking properties, rotational properties, workability, strength, and the like.

  As the shape of the locking means 14, a gear is conceivable, but in the present embodiment, the shape is made into a gear shape in consideration of the rotational property and the fitting property.

  The electrical connector 20 of the present invention will be described based on the drawings. The components of the plug connector 30 will be described. First, the coupling 38, which is one of the points, will be described with reference to FIG. The coupling 38 is made of metal and is manufactured by a known cutting process. As the material of the coupling 38, dimensional stability, workability, weather resistance, strength, and the like are required, and examples thereof include brass and stainless steel.

  The coupling 38 has a substantially cylindrical shape, and an insertion hole 381 is provided at the center. The first fitting port 22 is formed on the insertion side of the socket connector 50 of the insertion hole 381, and the opposite side is a portion into which the body 36 is inserted. The shape and size of the insertion hole 381 need only be able to fit the body connector 36 and the socket connector 50, which is a mating connector, in consideration of connection stability, holding strength, workability, fitability, and the like. Design appropriately. The shape and size of the first fitting port 22 are the same.

  A second locking means 383 that locks with the locking means 14 of the fitting jig 10 is provided on the outer periphery opposite to the insertion side of the socket connector 50. The second locking means 383 is a portion that locks with the fitting jig 10 as long as it can be locked and can be engaged with the electrical connector 20 by rotating. The shape and size of the second locking means 383 are appropriately designed in consideration of locking properties, rotational properties, workability, strength, and the like. As the shape of the second locking means 383, a gear is conceivable, but in the present embodiment, it is formed into a gear shape in consideration of the rotational property and the fitting property.

  A fitting means 382 for fitting with the socket connector 50 is provided on the inner periphery of the insertion hole 381 on the first fitting port 22 side. The fitting means 382 only needs to be able to be fitted to the socket connector 50, and the method is appropriately designed in consideration of stable connection, connection strength, fitting property, workability, and the like. In this embodiment, a female screw is used.

  A holding means for holding the body 36 is provided on the opposite side of the first fitting port 22. The holding means may be any means as long as the coupling 38 can be rotatably held on the body 36. In the present embodiment, the coupling 38 is rotatably held by the body 36 by engaging a C-ring with the recesses of the body 36 and the coupling 38.

  The terminal 34 will be described. The terminal 34 is made of metal and is manufactured by a known cutting technique. The material of the terminal 34 is required to be springy or conductive, and examples thereof include beryllium copper and phosphor bronze.

  The terminal 34 has a contact portion that contacts the terminal 54 of the socket connector 50 on one end side, a connection portion that connects to a cable on the other end side, and a fixing portion between the contact portion and the connection portion. ing. The fixing portion is appropriately designed in consideration of holding force, workability, strength, and the like, and examples thereof include press-fitting, hooking (lance), welding, and integral molding. In this embodiment, it is fixed by press-fitting.

  The contact portion of the terminal 34 may have any shape as long as it can contact the terminal 54 of the socket connector 50, and is appropriately designed in consideration of contact stability, workability, strength, and the like. In this embodiment, a pin shape is used.

  The connecting portion is a portion connected to a cable, and the shape of the connecting portion may be any shape as long as it can be connected to the cable, and is appropriately designed in consideration of connectivity, strength, workability, and the like. Examples of the connection method include soldering and pressure bonding. In this embodiment, the cable is connected by soldering.

  Next, the insulator 32 will be described. The insulator 32 is an electrically insulating plastic, and is manufactured by known injection molding or cutting. The material is appropriately selected in consideration of dimensional stability, workability, cost, etc. Can include polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyamide (66PA, 46PA), liquid crystal polymer (LCP), polycarbonate (PC), and synthetic materials thereof.

  The insulator 32 is provided with a necessary number of insertion grooves into which the terminals 34 are inserted, except for fixing by integral molding, and is fixed by press-fitting, hooking (lance), welding or the like. In this embodiment, it is fixed by press-fitting. The shape and size of the insertion groove may be any shape as long as the terminal can be inserted and held, and is appropriately designed in consideration of holding force, strength, workability, and the like. In the present embodiment, the number of the insulators 32 is one, but a plurality of insulators may be used depending on the structure and electrical characteristics.

  Next, the body 36 will be described. The body 36 is made of metal and is manufactured by a known cutting process. As the material of the body 36, spring property, moldability and the like are required, and examples thereof include beryllium copper and phosphor bronze. The body 36 is substantially L-shaped in this embodiment. The body 36 is electrically connected by contacting the body 56 of the socket connector 50. The tip portion in the fitting direction can come into contact.

  The body 36 is provided with a mounting hole into which the insulator 32 is inserted. The mounting hole only needs to contain the insulator 32 and the cable. The shape and size of the mounting hole take into consideration dimensional stability, holding power of the insulator 32, continuity with the mating body 56, workability, strength, and the like. Design appropriately.

  On the outer peripheral side of the body 36 in the fitting direction, there is provided holding means that can rotatably mount the coupling 38. As the holding means, it is only necessary that the coupling 38 can be rotatably mounted. In this embodiment, the body 36 and the coupling 38 are provided with a recess, and the C-ring can be engaged with the recess to be rotated. I have to. The shape and size of the concave are appropriately designed in consideration of rotational properties, workability, strength, and the like.

  The reason why the body 36 is substantially L-shaped is to pull out the cable in a direction perpendicular to the terminal 34. Therefore, a hole that is connected to the mounting hole is also provided in a portion that protrudes perpendicular to the fitting direction. The shape and size of the hole only needs to be able to project the cable, and is appropriately designed in consideration of the size, workability, strength, and the like of the cable.

  Next, the socket connector 50 that is the mating connector will be described. First, the body 56 will be described. The body 56 is made of metal and is manufactured by a known cutting process. Since the material of the body 56 is required to be springy or moldable, beryllium copper, phosphor bronze, or the like can be used. The body 56 is electrically connected by contacting the body 36 of the plug connector 30. The tip portion in the fitting direction can come into contact.

  The body 56 mainly comprises a main body 561 and a flange 562. The main body 561 has a substantially cylindrical shape, and the main body 561 is provided with an insertion hole 565 (a plurality of steps with different diameters if necessary) provided on one side (fitting with the plug connector 30). Side) is formed with a fitting portion 24 that enters the first fitting port 22 of the plug connector 30, and a second fitting port 26 into which the tip of the body 36 of the plug connector 30 enters, and the other side is This is the part where the insert is inserted (inserted). The shape and size of the insertion hole 565 may be appropriately designed in consideration of connection stability, holding strength, workability, fitability, and the like as long as the insert can be inserted and the insert can be fixed. The shape and size of the fitting part 24 and the second fitting port 26 are only required to be fitted to the plug connector 30 and are appropriately designed in consideration of connection stability, holding strength, workability, fitting property, and the like. .

  On the outer periphery of the main body 561, fitting means 564 for fitting with the fitting means 382 of the coupling 38 is provided. The fitting means 564 only needs to be able to be fitted with the fitting means 382 of the plug connector 30, and the method is appropriately designed in consideration of stable connection, connection strength, fitting property, workability, and the like. In this embodiment, the fitting means 382 of the plug connector 30 is a male screw because it is a female screw.

  The flange 562 has a substantially rectangular parallelepiped shape, and holes 563 are provided in the vicinity of four corners. The socket connector 50 is fixed to a housing or the like by passing a screw 58 through the hole 563 and screwing the screw 58. The shape and size of the hole 563 may be designed as long as the screw 58 can be inserted, and is appropriately designed in consideration of holding strength, workability, and the like.

  In the present embodiment, a head 581 of the screw 58 is used as a portion that engages with the engaging means 12 of the fitting jig 10. That is, the engaging means 12 of the fitting jig 10 and the head 581 of the screw 58 are engaged. Even if it says an engagement, the engaging means 12 is rotatable and the recessed part of the said head 581 is used as a bearing.

  Next, the terminal 54 will be described. The terminal 54 is made of metal, and is manufactured by a known press working or cutting process. The material of the terminal 54 is required to be springy or conductive, and examples thereof include beryllium copper and phosphor bronze. The terminal 54 includes a contact portion that contacts the terminal 34 of the plug connector 30, a connection portion that is connected to a cable, and a fixing portion that is fixed to the insulator between the contact portion and the connection portion. .

  The contact portion of the terminal 54 may have any shape as long as it can contact the terminal 34 of the plug connector 30 and is appropriately designed in consideration of contact stability, workability, strength, and the like. In this embodiment, a socket shape is used.

  The connecting portion is a portion connected to a cable, and the shape of the connecting portion may be any shape as long as it can be connected to the cable, and is appropriately designed in consideration of connectivity, strength, workability, and the like. In this embodiment, the cable is connected by soldering.

  The fixing portion is a portion to be fixed to the insert 52, and may have any shape and size as long as it can be fixed, but is appropriately designed in consideration of holding force, workability, strength, dimensional stability, and the like. In this embodiment, a wide portion is provided, and the wide portion is fixed by being sandwiched between two inserts.

  Next, the insert 52 will be described. This insert 52 is an electrically insulating plastic, and is manufactured by a known technique of injection molding or cutting, and this material is appropriately selected in consideration of dimensional stability, workability, cost, etc. Examples include polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyamide (66PA, 46PA), liquid crystal polymer (LCP), polycarbonate (PC), and synthetic materials thereof. In this embodiment, there are two inserts 32, and the terminals 54 are fixed by sandwiching the wide portion of the terminals 54 with the two inserts. In this embodiment, there are two inserts, but three or more or one insert may be used depending on the structure and electrical characteristics.

  The two inserts 32 are provided with a required number of insertion holes into which the terminals 54 are inserted (inserted). The shape and size of the insertion hole only needs to be inserted into the terminal 54, and is appropriately designed in consideration of connection stability, holding force, workability, strength, and the like. A wide portion is provided on the outer periphery of the two inserts 32, the wide portion is hooked on a step in the insertion hole 565 of the body 56, and a washer as a separate member from the opposite side (connection side) to the fitting direction. The two inserts 32 are fixed by inserting and sandwiching them.

  In this embodiment, the screw 58 for attaching the socket connector 50 to the housing will be described. The screw 58 is made of metal, and is manufactured by a known technique such as cutting. The material of the screw 58 is required to have springiness, moldability, and the like, and examples thereof include beryllium copper and phosphor bronze. be able to. The screw 58 mainly includes a head portion 581 and a screw portion 582. (The screw portion is omitted in FIG. 4B.) The socket 58 is attached to the housing by passing the screw 58 through the hole 563 of the body 56 and screwing the screw portion 582. ing.

  The head 581 is formed in accordance with the shape of the object in which the concave portion into which a hexagon wrench or the like enters is inserted. The engagement means 12 of the fitting jig 10 is engaged with the recess so as to be rotated, and the two connectors 30 and 50 are fitted. That is, one end portion of the fitting jig 10 is engaged (rotatably) with the recess, and the fitting jig 10 is rotated counterclockwise to fit the two connectors 30 and 50 together. It is combined. The recess is used as a bearing.

Finally, a method for fitting the plug connector 30 and the socket connector 50 will be described.
First, the fitting jig 10 is inserted substantially perpendicular to the fitting direction. Then, the engaging means 12 and the locking means 14 of the fitting jig 10 are almost simultaneously connected to the head 581 of the screw 58 to which the socket connector is attached and the second locking means 383 of the plug connector 30. , Engage and lock respectively. In the present embodiment, the tip of one end of the fitting jig 10 is engaged with the head 581 of the screw 58, and the gear 14 which is a locking means of the fitting jig 10 is the first of the plug connector 30. It locks with the gear 383 which is two locking means.
Next, the fitting jig 10 is rotated counterclockwise with each engaged and locked. Then, the coupling 38 rotates clockwise, and the fitting means 382 of the coupling 38 is fitted with the fitting means 564 of the body 56 of the socket connector 50. In this embodiment, the female screw 382 of the coupling 38 is screwed onto and fitted into the male screw 564 of the body 56.
Finally, the fitting jig 10 is rotated to the position where the coupling 38 is fitted, and the plug connector 30 and the socket connector 50 are fitted.
When it is desired to remove the plug connector 30 from the socket connector 50, after the fitting jig 10 is inserted, it is removed by rotating the fitting jig 10 clockwise, contrary to the fitting.

  The present invention is utilized for electrical connectors used in communication devices, electrical devices, and electronic devices of mobile phone base stations and mobile base stations, and particularly when the plug connector is fitted to the mating connector in a narrow space. The present invention relates to a fitting method that can be easily fitted, a fitting jig used in the method, and the structure of the plug connector.

10 fitting jig 12 engaging means 14 locking means (gear)
16 operation portion 20 electrical connector 22 first fitting port 24 fitting portion 26 second fitting port 30 plug connector 32 insulator 34 terminal 36 body 38 coupling 381 insertion hole 382 fitting means (female screw)
383 Second locking means (gear)
50 Socket connector (mating connector)
52 Insert 54 Terminal 56 Body 561 Body 562 Flange 563 Hole 564 Fitting means (male thread)
58 Screw 581 Head

Claims (6)

On one end side, it has an engaging means for engaging with the mating connector,
A fitting jig characterized by having locking means for locking with a plug connector at a predetermined position. The fitting jig according to claim 1, wherein the shape of the locking means is a gear shape. A plug connector detachably fitted to the mating connector,
Having a fitting means for fitting with the mating connector by rotating, and providing a second locking means for locking with the locking means on the member having the fitting means;
A plug connector, wherein the locking means and the second locking means are locked and the fitting jig is rotated to be engaged with the mating connector. 4. The plug connector according to claim 3, wherein the second locking means has a gear shape. A method for fitting a plug connector and a mating connector,
Locking the locking means of the fitting jig and the second locking means of the plug connector;
Engage the engagement means of the fitting jig with the mating connector,
A fitting method comprising: fitting the plug connector and the mating connector by rotating the fitting jig. 6. The fitting method according to claim 5, wherein the locking means and the second locking means have a gear shape.

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