JP4774547B2 - Light bulb socket - Google Patents

Description

  The present invention relates to a socket for mounting a light bulb having a screw-type base such as an incandescent light bulb or a light bulb type fluorescent lamp.

  When attaching a light bulb with a screw-on base to the socket, align the male screw formed on the outer surface of the base with the female screw formed on the inner surface of the socket mounting hole, and rotate the bulb while pressing it toward the socket. Therefore, it is necessary to screw the screw portions together. Therefore, attaching the light bulb to the socket has been a laborious work. In general, since the socket is often attached to a high place such as a ceiling, it is necessary to perform the above-described operation while extending the back and arms using a ladder or a chair. For this reason, it is a work accompanied by dangers such as falling or injury.

  From the above, a technique for easily attaching and detaching a light bulb to a socket has been conventionally developed. Patent Document 1 discloses a structure in which first and second contact pieces are provided in a mounting hole of a socket into which a bulb base is inserted. The first contact piece is formed of a leaf spring bent in a “<” shape, and elastically engages with the screw portion of the cap of the bulb from the side. The second contact piece is opposed to the tip convex portion of the base, and the tip convex portion of the base is fitted by inserting the base of the bulb into the mounting hole.

In this structure, the first contact piece is elastically engaged with the screw portion of the base from the side by pushing the base of the bulb into the mounting hole of the socket. Further, the bulb is positioned by fitting the tip convex portion of the base into the second contact piece. Therefore, it is possible to easily attach the light bulb simply by pushing it into the socket. In this structure, the second contact piece only positions the bulb with respect to the socket, and basically, the first contact piece is engaged with the base by elastic force to fix the bulb to the socket. .
JP 2000-77146 A

  In the conventional structure, since the first contact piece supports the screw portion of the base by elastic force, there is a possibility that the insertion allowance of the bulb is shifted by a maximum of 1 pitch, and the insertion allowance of the base greatly varies by shifting by 1 pitch. Furthermore, since the engaging force for engaging the base and fixing the light bulb is only the elastic force of the first contact piece, the first contact piece is easily separated from the base. For this reason, the light bulb cannot be firmly fixed to the socket. Therefore, there is a problem that the fixing force of the bulb is easily loosened due to vibration or the like, and the bulb is accidentally dropped.

  The present invention has been made in consideration of such problems, and in addition to being able to easily attach and detach the light bulb, it is possible to firmly fix the base of the light bulb and prevent the light bulb from falling off. The object is to provide a socket for a possible light bulb.

  The socket for a light bulb according to the first aspect of the present invention is a socket case in which a contact for electrical connection with a light bulb is disposed inside and a mounting hole is formed in which a cap of a light bulb having a threaded portion is inserted from an insertion opening. And a guide hole formed in a socket case so as to communicate with the mounting hole, and a guide surface that is inclined so as to be gradually separated from the insertion port toward the back side of the mounting hole, and the guide An engagement member is provided in the guide hole so as to move along the surface, and engages with the base by movement in the insertion port direction, and an engagement member is attached so as to move in the engagement direction with the base. And an elastic member to be urged.

  In the first aspect of the present invention, the engaging member engages with the base of the light bulb by moving the engaging member along the guide surface, whereby the light bulb is attached to the socket. Since the guide surface is inclined so as to gradually move away from the insertion opening of the mounting hole as it goes to the inner side of the mounting hole, the engaging force of the engaging member with the base increases due to the wedge action of the guide surface. Therefore, the light bulb can be firmly fixed, and there is no inadvertent dropout.

  Invention of Claim 2 is the socket for light bulbs of Claim 1, Comprising: The said engaging member is an engagement piece in which the thread part engaged with the thread part of the said nozzle | cap | die was formed, It is characterized by the above-mentioned. To do.

  A third aspect of the present invention is the light bulb socket according to the first aspect, wherein the engagement member is an engagement shaft or an engagement ball that engages with a threaded portion of the base.

  A fourth aspect of the present invention is the bulb socket according to any one of the first to third aspects, wherein the operation member that separates the engagement member from the base against the biasing force of the elastic member is engaged. It is connected to the member.

  The invention according to claim 5 is the light bulb socket according to claim 4, wherein the operating member is connected to the engaging member, and is connected to the connecting shaft, and the outer side of the socket case. The elastic member biases the engaging member in the engaging direction with the base via the operating piece.

  According to the present invention, the engagement member moves on the inclined guide surface so as to gradually move away from the insertion hole insertion hole as it goes toward the inner side of the attachment hole, and engages with the base of the light bulb. In this structure, since the engaging member engages with the base with a large engaging force by the wedge action of the guide surface, the bulb can be firmly fixed, and inadvertent dropping does not occur.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In addition, in each embodiment, the same code | symbol is attached | subjected and corresponded to the same member.

(First embodiment)
1 to 4 show a first embodiment of the present invention. FIG. 1 shows a socket S1, FIG. 2 shows a socket case 1, FIG. 3 shows an engaging piece 2 as an engaging member, and FIG.

  The socket S1 of this embodiment includes a socket case 1, an engagement piece 2 as an engagement member, a spring 3 as an elastic member, and contacts 4 and 5 for electrical connection with a light bulb. Yes. As shown in FIG. 4, the light bulb 20 attached to the socket has a structure in which a base 21 is provided on the upper portion of the light bulb body 23 and a screw part (male thread part) is formed on the outer peripheral surface of the base 21. The outer surface of the shape.

  The socket case 1 has a mounting hole 1a as shown in FIGS. The mounting hole 1a is a hole into which the cap 21 of the light bulb 20 is inserted, and is a cylindrical hole. By opening the lower end portion of the mounting hole 1a, the insertion hole 13 is inserted.

  The socket case 1 in the upper part of the mounting hole 1a is formed with an insertion hole 1e communicating with the mounting hole 1a. The insertion hole 1e is for pulling the contacts 4 and 5 into the mounting hole 1a. The contact 4 is attached to the socket case 1 so that the contact 4 is positioned on the bottom surface of the mounting hole 1a and the contact 5 is positioned on the side surface of the mounting hole 1a. . By attaching the light bulb 20 to the socket S <b> 1, as shown in FIG. 4, the contact 4 comes into contact with the tip of the base 21 of the light bulb 20, and the contact 5 comes into contact with the side surface of the base 21. By these contacts, the light bulb 20 is brought into an electrically conductive state and can be lit. Inside the socket case 1, a groove 1f for attaching the contact 5 to the socket case 1 is formed so as to face the attachment hole 1a (see FIG. 2).

  As shown in FIG. 2, a guide hole 10 is formed in the socket case 1. The guide hole 10 has a rectangular shape. The guide hole 10 is formed on the inner surface of the socket case 1 and communicates with the mounting hole 1a. A guide surface 11 is formed in the guide hole 10. The guide surface 11 is located on the bottom surface of the guide hole 10 and serves as a slide surface on which the engagement piece 2 moves. The guide surface 11 is inclined so as to gradually move away from the insertion port 13 toward the back side of the mounting hole 1a.

  The engagement piece 2 as the engagement member is movably inserted into the guide hole 10. As shown in FIG. 3, the engaging piece 2 has a rectangular outer shape, and both side surfaces 2 c come into contact with the inner surface of the guide hole 10, and slide inside the guide hole 10 in this contact state. Therefore, the engagement piece 2 does not rattle during movement in the guide hole 10. Note that after the engaging piece 2 is inserted into the guide hole 10, the engaging piece 2 does not fall out of the guide hole 10. The engaging piece 2 moves along the guide surface 11 of the guide hole 10, and an inclined surface 2a corresponding to the guide surface 11 is formed on the back side. Further, a screw portion (female screw portion) 2 b that is screwed into the screw portion 22 of the base 21 is formed on the front surface of the engagement piece 2.

  The spring 3 as an elastic member is disposed above the engagement piece 2, and a spring receiving hole 1 d in which the spring 3 is set is formed inside the socket case 1. The spring receiving hole 1 d is formed in the upper part of the guide hole 10 and extends linearly from the guide hole 10. The spring 3 is elastically pressed against the engagement piece 2 in the guide hole 10 by being inserted into the spring receiving hole 1d. By this pressing, the engaging piece 2 is urged so as to move downward along the guide surface 11. That is, the spring 3 biases the engaging piece 2 so as to move in the direction of the insertion port 13 of the mounting hole 1a. By this movement, the engaging piece 2 becomes the screw portion 22 of the base 21 as described later. Engage with.

  Next, attachment of the light bulb 20 to the socket S1 of this embodiment will be described with reference to FIG. After the center of the base 21 of the light bulb 20 and the center of the socket case 1 are aligned, the base 21 of the light bulb 20 is pushed into the mounting hole 1a from the insertion opening 13 as shown by an arrow E in FIG. By this pushing, the screw portion 22 of the base 21 hits the lower surface of the engagement piece 2, and the engagement piece 2 slides on the guide surface 11 diagonally upward as indicated by the arrow F as shown in FIG. Retreat from the unit 22. For this reason, the light bulb 20 can be pushed into the socket case 1 without rotating.

  FIG. 4C shows a state in which the cap 21 of the light bulb 20 is pushed into the mounting hole 1 a, and the contact 4 contacts the tip of the cap 21 and the contact 5 contacts the side surface of the cap 21. Further, the engagement piece 2 slides and moves obliquely downward as indicated by an arrow H along the guide surface 11 by the biasing force of the spring 3. That is, the engagement piece 2 slides toward the insertion port 13. By this sliding movement, the engaging piece 2 is engaged with the base 21. At this time, the screw portion 2 b on the front surface of the engagement piece 2 engages with the screw portion 22 of the base 21. Thus, in a state where the engagement piece 2 is engaged with the base 21, the light bulb 20 does not fall out of the socket S <b> 1 even if the hand is released from the light bulb 20.

  Thereafter, the light bulb 20 is rotated in the tightening direction indicated by the arrow G (clockwise in this embodiment). Due to this rotation, the engaging piece 2 slides diagonally downward (in the direction of the insertion port 13) indicated by the arrow H direction while engaging the base 21, and the screw portion 2 b engages with the screw portion 22 of the base 21. The engaging piece 2 is firmly engaged with the base 21. At the same time, since the outer peripheral surface of the base 21 is pressed against the inner peripheral surface of the mounting hole 1a, the base 21 is located between the engaging piece 2 and the inner peripheral surface facing the engaging piece 2 of the mounting hole 1a. It is sandwiched and held. Thereby, the light bulb 20 is attached to the socket S1.

  When the light bulb 20 is removed from the socket S1, the light bulb 20 is rotated in the anti-G direction (in this embodiment, counterclockwise) which is the anti-tightening direction.

  In such an embodiment, when the cap 21 of the light bulb 20 is pushed into the mounting hole 1a of the socket case 1, the engaging piece 2 engages with the cap 21 and the light bulb 20 is attached. be able to. The engagement piece 2 is engaged with the base 21 by a wedge structure that engages when the engagement piece 2 moves obliquely downward along the guide surface 11. In such a wedge action of the guide surface 11, the force by which the engagement piece 2 holds the base 21 (force to press the base 21) can be increased, and the light bulb 20 can be firmly fixed. Therefore, the light bulb 20 can be securely attached to the socket S1 without inadvertently dropping off. In particular, in this embodiment, a screw portion 2 b is formed on the front surface of the engagement piece 2, and this screw portion 2 b engages with the screw portion 22 of the base 21, so that the engagement piece 2 and the base 21 are engaged. There is a merit to become stronger.

(Second Embodiment)
5 to 9 show a second embodiment of the present invention. FIG. 5 shows a socket S2 of this embodiment, FIG. 6 shows an engaging piece 2, FIG. 7 shows a socket case 1, FIG. Indicates each operation.

  In the socket S2 of this embodiment, an operation member 7 is added to the socket S1 of the first embodiment. The operation member 7 is provided in a state of being connected to the engagement piece 2.

  The operation member 7 has an operation piece 14 shown in FIG. As shown in FIG. 8, the operation piece 14 has a U-shape in which leg portions 14c are integrally formed from both sides of the connecting portion 14a. A spring 8 as an elastic member is arranged between the operation piece 14 and the socket case 1. One end of the spring 8 is inserted into a spring receiving portion 14 b formed in the connecting portion 14 a of the operation piece 14, and the other end is in contact with the outer surface of the socket case 1. The operation piece 14 is attached to the outer surface of the socket case 1 so as to be slidable. In order to guide the slide movement of the operation piece 14, a slide groove 1h in which both the leg portions 14c move is formed in the lateral direction on the outer surface of the socket case 1 (see FIG. 7).

  The connecting shaft 6 connects the operation piece 14 and the engaging piece 2, and the engaging piece 2 is formed with a shaft hole 2 d through which the connecting shaft 6 passes (see FIG. 6). The socket case 1 is formed with a long hole 1g through which the connecting shaft 6 passes. As shown in FIG. 7, the long hole 1 g has the same inclination as the guide surface 11 of the guide hole 10. Furthermore, long holes 14d through which the connecting shaft 6 passes are formed in both leg portions 14c of the operation piece 14. The long hole 14 d extends in the vertical direction and intersects with the long hole 1 g of the socket case 1.

  In this embodiment, the connecting shaft 6 is inserted over the long hole 1 g of the socket case 1, the shaft hole 2 d of the engagement piece 2, and the long hole 14 d of the operation piece 14. As a result, the engaging piece 2 is connected to the operation piece 14 via the connecting shaft 6. Accordingly, the engagement piece 2 is moved by the operation on the operation member 7. Specifically, when the operating piece 14 of the operating member 7 is pushed in the direction of the socket case 1, the connecting shaft 6 is moved obliquely upward along the long hole 1 g, and accordingly the engaging piece 2 is moved on the guide surface 11. Slide diagonally upward.

  Further, the spring 8 is sandwiched between the operation piece 14 and the socket case 1. The spring 8 urges the operating piece 14 away from the socket case 1, and the urging force in this direction is transmitted to the engagement piece 2 via the connecting shaft 6. As a result, the engaging piece 2 is biased so as to slide on the guide surface 11 in an obliquely downward direction that is the direction of the insertion port 13.

  FIG. 9 shows the operation of the socket S2 of this embodiment. The light bulb 20 is attached to the socket S2 in the same manner as in the first embodiment, and the light bulb 20 can be easily attached. Further, since the engaging piece 2 moves obliquely downward along the guide surface 11, the bulb holding force of the engaging piece 2 is increased by the wedge action of the guide surface 11, and the bulb 20 can be prevented from falling off. The bulb 20 is removed by the procedure shown in FIG.

  As shown in FIG. 9 (a), the light bulb 20 is rotated by a small amount in the direction of arrow I (counterclockwise in this embodiment), which is the anti-tightening direction, and the engaging piece 2 is separated from the base 21. This is because after the light bulb 20 is attached to the socket S2, the engagement piece 2 is firmly engaged with the base 21 by the wedge action described above, and the engagement force is slightly applied to operate the operation piece 14. It is necessary to loosen.

  Next, as shown in FIG. 9B, a force in the direction of arrow J is applied to the operation piece 14 of the operation member 7 to push the operation piece 14 in the direction of the socket case 1. As a result, the operating force is transmitted to the engagement piece 2 via the connection shaft 6, and the engagement piece 2 slides obliquely upward on the guide surface 11 as indicated by the arrow K and moves away from the base 21. Accordingly, the engagement piece 2 is disengaged from the engagement with the base 21. In this state, the light bulb 20 can be pulled out in the direction of the arrow L while the operation piece 14 is pushed in the direction of the arrow J as shown in FIG. 9C, and the light bulb 20 can be easily removed from the socket S2.

  In such an embodiment, as in the first embodiment, the engaging force of the engaging piece 2 is increased by the wedge action of the guide surface 11, so that the light bulb 20 can be reliably mounted. In addition, since the operation member 7 is provided, the light bulb 20 can be easily removed from the socket.

(Third embodiment)
10 and 11 show a third embodiment of the present invention. FIG. 10 shows a socket S3 of this form, and FIG.

  In this embodiment, the engagement shaft 16 is used as an engagement member that engages with the screw portion 22 of the cap 21 of the light bulb 20. The engagement shaft 16 is a horizontally long rod having a diameter substantially equal to the pitch width of the screw portion 22 formed on the base 21. The engaging shaft 16 is inserted into guide holes 17 formed in the socket case 1 at both end portions 16a in the length direction. As shown in FIG. 11, the bottom surface of the guide hole 17 is a guide surface 11 on which the engagement shaft 16 slides. The entire guide hole 17 including the guide surface 11 is inclined so as to gradually move away from the insertion port 13 toward the inner side of the mounting hole 1a. In this case, you may form so that only the guide surface 11 may incline so that it may leave | separate from the insertion port 13 gradually as it goes to the back | inner side of the attachment hole 1a.

  The guide hole 17 communicates with the mounting hole 1a, and a spring 3 as an elastic member is provided therein. The engagement shaft 16 can reciprocate in the vertical direction along the guide hole 17. The spring 3 urges the engagement shaft 16 to move in the guide hole 17 in the direction of the insertion port 13. Thereby, the engagement shaft 16 is urged so as to move in a direction to engage with the base 21.

  In this embodiment, the cap 21 of the light bulb 20 is inserted into the mounting hole 1 a from the insertion port 13. By this insertion, the screw portion 22 of the base 21 hits the engagement shaft 16, and the engagement shaft 16 moves obliquely upward on the guide surface 11. Therefore, the base 21 can be pushed into the mounting hole 1a without rotating the light bulb 20. In a state where the light bulb 20 is pushed in until the tip portion of the screw portion 22 of the base 21 contacts the contact 4, the engagement shaft 16 biased by the spring 3 is obliquely downward on the guide surface 11 (in the direction of the insertion port 13). To move to the base 21 (the screw portion 22 of the base 21). For this reason, even if the hand is released from the light bulb 20, the light bulb 20 does not fall off.

  Thereafter, by rotating the light bulb 20 in the tightening direction (see the arrow G direction in FIG. 4), the engagement shaft 16 moves obliquely downward on the guide surface 11 while engaging the base 21. Therefore, the engagement shaft 16 is firmly engaged with the base 21 by the wedge action of the guide surface 11, and the light bulb 20 is stably attached. Also in this embodiment, the engagement shaft 16 is firmly engaged with the base 21 by the wedge action of the inclined guide surface 11. Therefore, the light bulb 20 is not accidentally dropped.

  When removing the light bulb 20 from the socket S3, the light bulb 20 is rotated in the anti-tightening direction (counterclockwise).

(Fourth embodiment)
12 and 13 show a fourth embodiment of the present invention. FIG. 12 shows a socket S4, and FIG.

  In this embodiment, the engagement shaft 16 of the third embodiment is used as an engagement member that engages with the base 21 and the operation member 7 of the second embodiment is provided to release the engagement of the engagement shaft 16. It is.

  A guide hole 17 for sliding the engagement shaft 16 is formed in the socket case 1. As shown in FIG. 13, the bottom surface of the guide hole 17 is a guide surface 11 on which the engagement shaft 16 slides. The entire guide hole 17 including the guide surface 11 is inclined so as to gradually move away from the insertion port 13 toward the back side of the mounting hole 1a. In this case, you may form so that only the guide surface 11 may incline so that it may leave | separate from the insertion port 13 gradually as it goes to the back | inner side of the attachment hole 1a.

  Both ends 16 a of the engaging shaft 16 are extracted from the socket case 1 and are connected to both leg portions 14 c of the operation piece 14. In this case, both the leg portions 14c of the operation piece 14 are formed with elongated holes 14d in the vertical direction, and both end portions 16a of the engagement shaft 16 are connected to the operation piece 14 by being inserted into the elongated holes 14d. By providing the spring 8 as an elastic member between the operation piece 14 and the socket case 1, the engagement shaft 16 is urged to move in the engagement direction with the base 21 via the operation piece 14. .

  In this embodiment, the cap 21 of the light bulb 20 is pushed from the insertion port 13 into the mounting hole 1a. As a result, the screw portion 22 of the base 21 hits the engagement shaft 16 and the engagement shaft 16 moves obliquely upward on the guide surface 11 and retracts, so that the base 21 can be attached to the mounting hole 1a without rotating the bulb 20. Can be pushed into. In a state where the light bulb 20 is pushed in, the engagement shaft 16 biased by the spring 8 moves obliquely downward (in the direction of the insertion port 13) on the guide surface 11 and moves to the base 21 (the screw portion 22 of the base 21). Engagement thereby allows the bulb 20 to be mounted in the socket S4. At this time, since the engagement shaft 16 is firmly engaged with the base 21 by the wedge action of the guide surface 11 on which the engagement shaft 16 moves, the light bulb 20 is not accidentally dropped off.

  On the other hand, when removing the light bulb 20 from the socket S4, the operation piece 14 is slightly rotated in the anti-tightening direction (the direction of arrow I in FIG. 9) to separate the engagement shaft 16 from the base 21. Then, the operating piece 14 is pushed (pressed in the direction of arrow J in FIG. 9), and the engaging shaft 16 is moved obliquely upward along the guide surface 11 to be separated from the base 21. Thereby, the engagement shaft 16 is disengaged from the engagement with the base 21. Thereafter, the light bulb 20 is removed from the socket S4 by pulling out the light bulb 20 from the socket S4 (withdrawal in the direction of arrow L in FIG. 9) while pushing the operation piece 14 (while pushing in the direction of arrow J in FIG. 9).

(Fifth embodiment)
14 and 15 show a socket S5 according to a fifth embodiment of the present invention. FIG. 14 shows the socket S5, and FIG.

  In this embodiment, the engaging ball 18 is used as an engaging member that engages with the screw portion 22 of the cap 21 of the light bulb 20. As the engaging sphere 18, a sphere having a diameter substantially equal to the pitch width of the screw portion 22 of the base 21 is used. The engagement ball 18 is inserted into a guide hole 17 formed in the socket case 1. In this case, the engaging ball 18 protrudes into the mounting hole 1a, but does not fall out of the guide hole 17.

  The bottom surface of the guide hole 17 is a guide surface 11 on which the engagement ball 18 moves. As shown in FIG. 13, the entire guide hole 17 including the guide surface 11 is inclined so as to gradually move away from the insertion port 15 of the mounting hole 1 a toward the back side of the mounting hole 1 a. In this case, you may form so that only the guide surface 11 may incline so that it may leave | separate from the insertion port 13 gradually as it goes to the back | inner side of the attachment hole 1a. A spring 3 as an elastic member is provided in the guide hole 17. The spring 3 biases the engaging ball 18 so as to move in a direction (obliquely downward) in which the engaging ball 18 is engaged with the base 21.

  In this embodiment, the cap 21 of the light bulb 20 is inserted into the mounting hole 1 a from the insertion port 13. By this insertion, the screw portion 22 of the base 21 hits the engaging ball 18, and the engaging ball 18 moves obliquely upward on the guide surface 11 and retracts. Therefore, the base 21 can be pushed into the mounting hole 1a without rotating the light bulb 20. In a state where the light bulb 20 is pushed in until the tip of the screw portion 22 of the base 21 contacts the contact 4, the engaging ball 18 biased by the spring 3 is obliquely downward on the guide surface 11 (in the direction of the insertion port 13). To the base 21 (the threaded portion 22 of the base 21). For this reason, even if the hand is released from the light bulb 20, the light bulb 20 does not fall off. Thereafter, the bulb 20 is rotated in the tightening direction (see the arrow G direction in FIG. 4), and the engagement ball 18 is moved obliquely downward on the guide surface 11 to be firmly engaged with the base 21. Thereby, the light bulb 20 is attached.

  When the light bulb 20 is removed from the socket S5, the light bulb 20 is rotated in the counter-tightening direction (counterclockwise direction) as in the conventional case.

  Also in this embodiment, since the engaging ball 18 is firmly engaged with the screw portion 22 of the base 22 by the wedge action of the guide surface 11, the light bulb 20 can be stably attached to the socket S5.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, an elastic body such as rubber can be used as the elastic member that biases the engaging member.

The socket of 1st Embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a bottom view, (d) is AA sectional view, (e) is B- B line sectional drawing, (f) is CC line sectional drawing. The socket case used for the socket of 1st Embodiment is shown, (a) is a side view, (b) is a bottom view, (c) is A1-A1 sectional view, (d) is B1-B1 sectional view, e) is a sectional view taken along line C1-C1. The engagement piece used for the socket of a 1st embodiment is shown, (a) is a side view and (b) is a front view. (A)-(d) is sectional drawing which shows the attachment procedure of the light bulb to the socket of 1st Embodiment. The socket of 2nd Embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a bottom view, (d) is A2-A2 sectional view, (e) is a side view It is. The engagement piece used for the socket of 2nd Embodiment is shown, (a) is a side view, (b) is a front view. The socket case used for the socket of 2nd Embodiment is shown, (a) is a side view, (b) is a bottom view, (c) is A3-A3 sectional view, (d) is B3-B3 sectional view, e) is a sectional view taken along line C3-C3. The operation piece used for the socket of 2nd Embodiment is shown, (a) is a top view, (b) is a side view, (c) is A4-A4 sectional view taken on the line. (A)-(c) is sectional drawing which shows the removal procedure of a light bulb from the socket of 2nd Embodiment. The socket of 3rd Embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a bottom view, (d) is A5-A5 sectional view taken on the line, (e) is B5- It is B5 sectional view taken on the line. The socket case used for the socket of 3rd Embodiment is shown, (a) is a top view, (b) is a side view, (c) is A6-A6 sectional view taken on the line. The socket of 4th Embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a bottom view, (d) is A7-A7 sectional view taken on the line. The socket case used for the socket of 4th Embodiment is shown, (a) is a top view, (b) is a side view, (c) is A8-A8 sectional view, (d) is B8-B8 sectional view. . The socket of 5th Embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a bottom view, (d) is A9-A9 sectional view taken on the line, (e) is B9- B9 line sectional drawing, (f) is a side view. The socket case used for the socket of 5th Embodiment is shown, (a) is a top view, (b) is a side view, (c) is A10-A10 sectional view taken on the line, (d) is B10-B10 sectional view taken on the line. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Socket case 1a Mounting hole 2 Engagement piece 3, 8 Spring 4, 5 Contact 6 Connection shaft 7 Operation member 10,17 Guide hole 11 Guide surface 13 Insertion port 14 Operation piece 16 Engagement shaft 18 Engagement ball 20 Light bulb 21 Base 22 Screw part

Claims (5)

A socket case in which a contact point for electrical connection with the light bulb is arranged inside and a mounting hole into which the base of the light bulb having a screw portion is inserted from the insertion port is formed;
A guide surface that is inclined so as to gradually move away from the insertion port as it goes to the back side of the mounting hole, and a guide hole formed inside the socket case so as to communicate with the mounting hole;
An engaging member that is provided in a guide hole so as to move along the guide surface and engages the base by moving in the direction of the insertion port;
An electric bulb socket, comprising: an elastic member that biases the engaging member so as to move in an engaging direction with the base.   2. The light bulb socket according to claim 1, wherein the engaging member is an engaging piece formed with a screw portion that engages with a screw portion of the base.   The bulb socket according to claim 1, wherein the engagement member is an engagement shaft or an engagement ball that engages with a screw portion of the base.   The light bulb socket according to any one of claims 1 to 3, wherein an operating member that separates the engaging member from the base against an urging force of the elastic member is connected to the engaging member.   The operation member includes a connection shaft connected to the engagement member, and an operation piece provided on the outer side of the socket case in a state of being connected to the connection shaft, and the elastic member includes an operation piece. The light bulb socket according to claim 4, wherein the engaging member is urged through an engagement direction with the base.

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