WO2005006503A1

WO2005006503A1 - Safety lamp holder with pinpoint pole

Info

Publication number: WO2005006503A1
Application number: PCT/CN2003/000546
Authority: WO
Inventors: Onnfah Foo
Original assignee: Mass Technology (H.K.) Ltd.
Priority date: 2003-07-10
Filing date: 2003-07-10
Publication date: 2005-01-20
Also published as: CN100379097C; AU2003257769A1; CN1802779A; HK1092288A1

Abstract

It relates to a kind of safety base for locking lamp holder and screwing lamp holder with pinpoint pole. The first one includes locking trunk, rooting plate, conducting piece, electrical contacting shaft with round end, pinpoint pole and spring switch. Pinpoint pole is fixed in the center mooring base of the locking trunk. The height between pinpoint pole and the inner surface of the locking trunk is bigger than the height between electrical contacting shaft with round end and the inner surface of the locking trunk. The second one includes housing, spring, pinpoint pole and flexing member conducting the lamp by pinpoint pole. When fixing lamp the lamp holder makes the pinpoint pole downward until the spring contacts and the lamp circuit is conducting and the lamp works well. When not fixing lamp the under part of the pinpoint pole is depart from the spring and the lamp is not electriferous. Furthermore, when people touch the pinpoint pole, it can makes people feel pain and stop pressing sequentially. So it can avoid the accident.

Description

Safety lamp holder with pointed needle cylinder

Technical field

The invention relates to a lamp holder of an illuminating lamp, and more particularly, to a bayonet lamp holder and a screw lamp holder with a spiked needle cylinder that can prevent accidental electric shock. Background technique

The lamp holder is a popular product, for example, a bayonet lamp holder used in conjunction with a bayonet lamp cap of a lighting lamp and a screw lamp holder used in conjunction with a screw mouth lampholder of a lamp. These lamp holders have hidden dangers during use. When the lamp holder is not equipped with a lighting lamp and the lamp's power switch is on, the metal in the lamp holder is charged. Due to the large caliber of the lamp holder, it is easy for humans to enter, which will cause or cause danger such as electric shock.

In Chinese Utility Model Patent Publication No. ZL91215869. 7, a screw and bayonet dual-use safety lamp holder is disclosed. The safety lamp holder is provided with a flexible top pole under its positive and negative electrical connection pieces and a positive contact. An insulating washer is installed on the upper end of the negative contact of the bayonet and the bayonet; a Chinese utility model patent number ZL93225663. 5 discloses a "screw and bayonet dual-purpose electric shock-proof lamp holder which is energized from the inside thereof" A tight insulating washer is provided between the rod and the compression spring so that the energized rod is not directly connected to the positive and negative pole; and the Chinese utility model patent number ZL932260388.1 also discloses the title "A screw, bayonet The dual-purpose safety lamp holder, the inventor proposed to change the bayonet slot of the original lamp holder into a rectangular block with a horizontal groove on one side that can slide in the bayonet tube to solve the problem of screw-on and bayonet lamps. The safety problem that the bayonet lamp head is not loose in the seat. It can be seen from the above prior arts that when the lamp seat is not equipped with a lighting lamp, the contacts in the lamp seat are not charged, so that it seems to be safe. Purpose, but it's actually not safe, Due to a hand touched the elastically often there is a pressure energized metal rod is moved, when the pressure is sufficient to cause the metal or down through the pole contact is energized, it will cause electric shock. SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned drawbacks and provide a safety lamp holder with a bayonet cap and a screw cap with a barbed needle cylinder that can prevent electric shock to the human body.

Confirm this The technical solution to achieve the above objective is such that the safety lamp holder of the bayonet lamp cap with a spiked needle cylinder according to the present invention includes:

A bayonet cylinder having a tubular central positioning seat at the bottom, two positioning vertical sleeves located on both sides of the central positioning seat, and a ring-shaped protrusion integrally extended radially from the outer peripheral surface of the lower part of the bayonet cylinder Fate

A fixing plate, the center of which has a through hole communicating with the inner hole of the central positioning base, and is fixed on the bottom surface of the bayonet cylinder;

Two metal conductive sheets, which are respectively installed on the fixing plate under the bottom surface of the positioning vertical sleeve;

Two electric contact round-headed rods, which are respectively elastically installed in the positioning vertical sleeve of the bayonet tube by the first spring in a head extension manner and are respectively located on the metal conductive sheet;

A spiked needle cylinder has a spiked cone shape at its end. The spiked needle cylinder is elastically installed in the center positioning seat of the bayonet cylinder through a second spring in a head extension manner, and the lower portion extends downward through Through the through hole of the fixing plate;

A wafer having a central hole and fixed on the exposed portion of the spiked needle cylinder passing through the through hole of the fixed disk through the central hole, and the height of the spiked needle cylinder on the inner bottom surface of the bayonet cylinder is greater than two The height of the contact round rod corresponding to the bottom surface of the bayonet tube;

A spring leaf switch composed of two pairs of spring leaves, wherein one end of the first pair of spring leaves is respectively fixed to the bottom surface of the fixed plate through an insulating sleeve and the other end thereof is extended under the wafer to make the wafer move downward. The first pair of spring leaves can be pushed, and one end of the second pair of spring leaves is respectively installed on the flange of the bayonet cylinder through an insulating sleeve and is located below the first pair of spring leaves, and is aligned with the first pair of spring leaves. In addition, each of the first pair of spring leaves is electrically connected to a metal conductive plate through a conductive member.

The safety lamp holder of the bayonet lamp head as described above, wherein each of the electric contact round head rods has a round head portion, a rod portion, and a portion located between the head portion and the rod portion and having a diameter larger than that of the head portion and the rod portion. The shoulder of the vertical sleeve has an inward convex ring extending inward; each electric contact round rod is installed in a vertical sleeve, the head of which is protruding upward from the internal convex ring of the vertical sleeve, the first The spring is sleeved in the shaft portion of the electric contact round rod and is located between the metal conductive sheet and the shoulder of the electric contact round rod.

The safety lamp holder of the bayonet lamp head as described above, wherein the positioning vertical sleeve includes a jacket integrated with the bayonet tube and an inner sleeve fixedly installed in the jacket, the inner sleeve having an inward extension An inner convex ring of each of the electrical contact round head rods protrudes upward from the inner sleeve of the inner sleeve, and the first spring is sleeved under the shoulder to electrically contact the metal rods in the round rod portion and located in the inner sleeve and Between shoulders. As described above, the safety lamp holder of the bayonet lamp head, wherein the first pair and the second pair of spring blades of the spring leaf switch are provided with contacts, and they are vertically opposite to each other and their distance is equal.

As described above, the safety lamp holder of the bayonet lamp cap, wherein the spiked needle cylinder is composed of a rod portion and a head having a diameter larger than the rod portion, and the inner hole of the central positioning base is stepped. The diameter of the stepped hole at the lower part of the stepped inner hole is smaller than the diameter of the upper hole, and the second spring is sleeved on the stem portion of the spiked needle cylinder and is located at the rear end face of the head of the spiked needle cylinder and the step of the central positioning seat Between the front faces of the holes.

The safety lamp holder of the bayonet lamp head as described above, wherein the center of the lower bottom surface of the fixed plate has a downwardly extending pipe portion so that the discs installed thereunder are spaced a certain distance from the free ends of the first pair of spring plates. distance.

The safety lamp holder with a screw-type lamp cap of the spiked needle cylinder according to the present invention includes a shell with an opening at the bottom and a metal screw sleeve installed in the shell, and further includes three contact spring pieces, namely a first A spring leaf, a second spring leaf, and a third spring leaf, wherein one end of each of the first and second spring leaf is respectively fixed below the bottom side of the casing through an insulating sleeve and is vertically spaced up and down from each other at a certain distance, One end of the third spring leaf is fixed below the other side of the bottom of the housing through an insulating sleeve, a contact-type spike bar, which is vertically spaced up and down from the other end of the third spring leaf at a certain distance, and a At the same time, the spiked needle cylinder is elastically moved relative to the third spring piece and the elastic telescopic device is used to elastically move the first spring piece relative to the second spring piece.

The safety lamp holder of the screw-type lamp cap as described above, wherein the elastic telescopic device includes a fixing base, which is a round tube integrally formed by a part of the hole wall at the bottom of the casing extending downward and is located in the casing. On the same central axis

A pushing block is a rectangular plate, the pushing block is movably disposed in the opening in a relatively fixed seat, and its horizontal portion contains a small hole, and the upper surface is aligned with the plane of the opening. The bottom end of its vertical portion abuts against the first spring leaf; and

A spring is installed in the inner hole of the fixing seat and is located between the bottom wall of the fixing seat and the pushing block; the contact-type spike needle cylinder has a spike-shaped tapered head and a diameter smaller than the head The rod part is inserted into the small hole of the pushing block through the free end of the rod part, passes through the first spring and the hole of the fixing seat, and has its tapered head above the pushing block, and the rod part protrudes from the bottom end of the fixing seat. ;

A wafer, which has a central hole and is fixed on the rod part protruding from the bottom end of the fixing seat through the central hole. According to the above description of the safety lamp holder with a spiked needle cylinder, it can be clearly seen that the present invention adopts setting up a needle cylinder with a spike at the central position in the bayonet and screw socket. This spiked needle cylinder can be along It moves axially and has elastic force. For a bayonet-type lamp holder, it can be used as a push rod of a switch. When moving downward, it can contact two pairs of spring leaves of a spring leaf switch spaced below it to make the lamp head electrically conductive. For screw sockets, this spiked needle cylinder can be used as a push rod to push the push block, and also serves as an electrical contact. It can make the first and second spring pieces under it contact and the end of the barbed needle cylinder contact with the third spring piece respectively, so that the lamp cap is electrically conducted. When the bayonet or screw mouth lighting is not installed in the lamp holder, the spiked needle cylinder rises to the limit position due to the elastic force. At this time, the lower end face of the spiked needle cylinder and the contact spring piece are not under pressure. Each electrical contact is open, so that the metal contacts in the lamp holder are de-energized.

The invention is advantageous in that a needle cylinder with spikes is set up in the lamp holder. Because of its existence, when a human hand touches in time, the spikes make people feel pain and do not dare to press down, thereby avoiding electric shock accidents. Overview of the drawings

The specific features and performance of the present invention are further given by the following embodiments and the accompanying drawings.

1 is a cross-sectional view of a safety lamp holder with a bayonet lamp cap having a spiked needle cylinder according to an embodiment of the present invention;

Fig. 2 is a sectional view of a safety lamp holder having a screw cap with a spiked needle cylinder according to a second embodiment of the present invention. Best Mode of the Invention

′ Please refer to FIG. 1, a safety lamp holder with a bayonet lamp cap having a pointed needle cylinder according to an embodiment of the present invention includes a bayonet tube 1, a fixing plate 2, two metal conductive sheets 3, and two electric The contact rod 4, a spiked needle cylinder 5, a disc 6, and a spring leaf switch are composed of two pairs of spring leaf 7 and 8. The bottom of the bayonet cylinder 1 is vertically provided with a central tube-shaped central positioning base 11 and two positioning vertical sleeves 12 and 13 symmetrically located on both sides of the center positioning base. A diameter is provided on the outer peripheral surface of the lower part of the bayonet cylinder. It extends to form an integral annular flange 14. In addition, each of the top openings or the inner peripheral surfaces of the center positioning base 11 and the positioning vertical sleeves 12 and 13 has a convex ring extending inwardly.

The fixing plate 2 has a through hole in the center, which is fixed on the bottom surface of the bayonet cylinder and communicates the through hole on the bottom plate with the inner hole of the center positioning base. Preferably, the lower bottom surface of the fixing plate 2 further has a pipe portion 21 extending downward along the peripheral wall of the through hole. This will be explained in detail below.

The two metal conductive pieces 3 are preferably circular, and are respectively installed between the bottom ends of the positioning vertical sleeves 12 and 13 and the upper surface of the fixing plate 2 in a compact manner; Each of the two electrical contact round rods 4 has a head, a rod portion, and a shoulder 41 between the head and the rod portion and having a diameter larger than that of the head and the rod portion. The round-head rod 4 is installed in one of the positioning vertical sleeves 12 and 13, and its head protrudes upward from the inner convex ring of the vertical sleeve. Each of the two electric contact round rods 4 can be elastically moved up and down in the axial direction of the positioning vertical sleeves 12 and 13 through the first spring 45. The first spring 45 is sleeved on the rod portion of the electrical contact round rod and is located between the metal conductive sheet 3 and the shoulder 41 of the electrical contact round rod.

The spiked needle cylinder 5 has a head and a shaft, and the end of the head is tapered. The spiked needle cylinder is elastically installed in the central positioning seat 11 of the bayonet cylinder through the second spring elasticity 55, and the height of the tip from the inner bottom surface of the bayonet cylinder is greater than that of the two electrical contact round rods 4 and the bayonet cylinder. The height of the inner bottom surface extends downward through the through hole of the fixing plate 2.

The disc 6 has a center hole in the center, and can be fixed on the exposed part of the barbed needle cylinder 5 passing through the through hole of the fixing plate 2 through the center hole.

The spring leaf switch is composed of two pairs of spring leaf 7 and 8, wherein one end of the first pair of spring leaf 7 is fixed on the bottom surface of the fixed plate 2 through an insulating sleeve 71 and the other end is extended under the disc 6 to make a circle. When the sheet is moved downward, the first pair of spring sheets 7 can be pushed, and one end of the second pair of spring sheets 8 is respectively mounted on the flange 14 of the bayonet cylinder through the insulating sleeve 81 and is located below the first pair of spring sheets 7, which The other end is aligned up and down with the first spring leaf 7 respectively. In addition, each of the first pair of spring leaf 7 is electrically connected to two metal conductive plates 3 through a conductive member (not shown), and the first pair of spring leaf switches Contacts are provided on the opposite surfaces of the second pair of spring blades 7 and 8, and they are vertically opposite to each other, and the distance between them is equal. The fixed ends of the second pair of spring blades 8 can be used as connection ends for external power input wires or power bow I wires 9 to communicate with the power source.

In a preferred embodiment, the positioning vertical sleeves 12 and 13 include an outer sleeve integrated with the bayonet tube 1 and an inner sleeve 121 and 131 fixedly installed in the outer sleeve. The inner sleeve has an inner portion extending inwardly. Convex ring. Each electric contact round head rod 4 is installed in an inner sleeve 121, 131, the head or upper part of which protrudes from the inner convex ring of the inner sleeve 121, 131, and the first spring 45 is sleeved under the convex shoulder for the electric contact circle The head rod is located between the metal conductive piece 3 and the shoulder 41 under the inner sleeve, so as to electrically contact the round head rod 4, the first spring 45 and the inner sleeves 121 and 131 after being assembled together and inserted and fixed at the bayonet In the jacket of tube 1.

On the other hand, in order to make the spiked needle cylinder 5 have a sufficiently long axial moving distance, the top opening or the inner peripheral surface of the central positioning base 11 is not provided with an inwardly protruding ring, but the inner hole is made of Stepped. The diameter of the stepped hole in the lower part of the stepped inner hole is smaller than that of the upper hole. After the spring 55 is sleeved on the shaft of the spiked needle cylinder and located between the rear end of the head and the front surface of the stepped hole, the spiked needle cylinder 5 can be mounted on it. The lower disc 6 prevents the spiked needle cylinder 5 from coming out and restricts the distance of vertical movement. Correspondingly, a downwardly extending tube portion 21 is provided in the center of the fixing plate 2, which can ensure that the spiked needle cylinder 5 moves smoothly and vertically, and keeps the disc 6 mounted thereunder and the free end of the first pair of spring plates 7 constant. Safe separation distance.

The working principle of the safety lamp holder with a bayonet lamp cap with a spiked needle cylinder is: When the lighting lamp is installed on the bayonet cylinder 1, the lamp head first presses against the end of the spiked needle cylinder 5 and pushes the Move down, and after the needle bar 5 moves down a certain distance, the lamp cap is simultaneously pressed against the ends of the two electric contact round rods 4 and pressed against the metal conductive sheet 3 on the bottom surface of the bayonet tube. The spiked needle cylinder 5 continues to move downwards until the lamp cap is fully engaged in the bayonet cylinder 1 slot, and it can push the contact between the first pair of spring blade contacts 7 and the second pair of spring blades 8 through the disc installed below it. The point contact makes the lamp cap and the power circuit conduct. When the lamp is removed, as the lamp head moves away from the bayonet cylinder 1, the spiked needle cylinder 5 is lifted by the elastic force of the second spring 55, and the spiked needle cylinder 5 is released from the first pair of springs. At the same time as the sheet 7, the contacts of the first pair of spring sheets 7 are separated from the contacts of the second pair of spring sheets 8 to open the circuit. In the case of the separation, the spiked needle cylinder 5 has a sufficient electrical safety separation distance required to maintain electrical connection with the first and second pair of spring blades 7, 8, especially when no lighting is installed At this time, in addition to the fact that the needle bar 5 and the metal rod 4 are uncharged, people do not dare to press down because the spikes of the needle bar 5 can sting their fingers when the finger touches them. The safety lamp holder of the bayonet lamp cap will not cause an electric shock.

Please refer to FIG. 2, which shows a second embodiment of the present invention, a safety lamp holder with a screw cap with a spiked needle cylinder, which includes a housing 10 having an opening 120 at a bottom 110, a A metal screw sleeve 20 having an internal thread, a first spring piece 30, a second spring piece 40, and a third spring piece 50, a spiked needle cylinder 60 and a spiked needle cylinder 60 which can simultaneously make the spiked needle cylinder 60 relative to the first An elastic telescopic device that elastically moves the three spring pieces 50 and elastically moves the first spring piece 30 relative to the second spring piece 40. In this safety lamp holder, the casing 10 and the metal screw sleeve 20 are installed in a conventional manner, that is, the latter is placed in the casing 10.

One ends of the first and second spring pieces 30, 40 are respectively fixed below the one side of the bottom portion 110 through insulating sleeves 35, 45, and are opposed to each other and vertically spaced at a certain distance from each other. The first spring piece 30 may be directly conductively connected to the metal screw sleeve 20, or a conductive member 70 may be used to electrically connect the first spring piece 30 and the metal screw sleeve 20 by welding or screw crimping.

One end of the third spring piece 50 is fixed below the other side of the bottom 110 through an insulating sleeve 55.

The contact-type pointed needle cylinder 60 includes a head 61 and a rod portion 62 having a diameter smaller than that of the head 61. The top of the head 61 can be made into a conical shape to facilitate reliable contact with the lamp cap and prevent hand access . Elastic expansion devices include:

A fixing seat 80 is a pipe seat formed by extending a part of the wall of the opening 120 in the bottom 110 of the housing downward. The center line of the center hole of the fixing base coincides with the center line of the casing 10;

A pushing block 90 includes a flat plate-like plate portion 91 provided with a small hole thereon and a rod portion 92 extending vertically downward from one side of the plate portion. The plate portion 91 is movable relative to the fixed seat 80 Grounded in the opening 120, the bottom end of the rod portion 92 is in contact with the free end of the first spring piece 30;

A spring 100 is installed in the inner hole of the fixing seat 80 and is located between the bottom wall of the fixing seat 80 and the pushing block 90. The spiked needle cylinder 60 can be inserted into the small hole of the pushing block 90 through the free end of the rod 62 thereof. And can pass through the holes of the spring 100 and the fixing base 80 so that the tapered head 61 is located on the pushing block 90, and the lower portion of the rod portion 62 protrudes from the bottom wall of the fixing base 80 and connects with the other of the third spring piece 50. One end (contact end) is vertically spaced up and down at a certain distance from each other;

A wafer 200 has a central hole and can be mounted on the barbed needle cylinder 60 passing through the fixing base 80 through the central hole.

Preferably, an axial notch 81 having a certain length is provided on a peripheral wall of one side of the fixing seat 80. In this way, the plate portion 91 of the pushing block 90 is inserted into and located in the notch 81 and can move up and down along the axis of the spiked needle cylinder 60 in the notch 81, and the relative distance between the first and second spring pieces 30 and 40 and The relative distance between the third spring piece and the bottom end of the rod portion of the spiked needle cylinder is equal. The fixed ends of the second and third spring pieces 40 and 50 are the connection ends of the external power input wires.

When the connection ends of the second and third spring pieces 40 and 50 are respectively connected to the power lead, the contact-type metal rods located above them and the first spring piece 30 are not charged.

The working principle of the safety lamp holder with a screw pin base with a pointed needle cylinder: When the lighting lamp is installed on the lamp holder, that is, when the screw lamp holder is screwed into the lamp holder housing 10, due to the pressing effect of the lamp holder, it Will push the contact-type barbed needle cylinder 60 to move downward, and at the same time drive the pushing block 90 to move axially downward along the wall of the fixing seat 80 around the notch 81. The downward movement of the pushing block 90 will cause the rod portion 92 of the pushing block 90 to push the first spring piece 30 below it, so that the axial movement of the spiked needle cylinder 60 reaches the contact with the contact of the third spring piece 50 at the same time The first spring piece 30 is also elastically bent downward to make contact with the contacts of the second spring piece 40. In this way, the lamp holder is electrically connected, and the illuminating lamp or light bulb can be normally ignited and operated.

When the lighting lamp is detached from the lamp holder, the pushing block 90 and the spiked needle cylinder 60 move upward at the same time, so that the third spring piece 50 is separated from the spiked needle cylinder 60, and the first spring piece 30 and the second spring piece 40 disengaged, so the contacts Disconnect and disconnect the circuit. In addition, due to the elasticity of each spring leaf, they can be restored to their original positions. After the circuit is disconnected, the needle bar 60 and the first spring piece 30 are uncharged, and they have a sufficient electrical safety distance from the second and third spring pieces. In this way, as in the first embodiment, when the lighting lamp is not installed, the contacts are non-charged, and the spikes of the needle cylinder 60 make people's fingers afraid to touch, so no electric shock accident will occur.

Although the above embodiments have been described in detail for the purpose of explaining the present invention, those skilled in the art can fully make various changes to the above embodiments without departing from the scope and spirit of the present invention. Changes, additions, deletions, or equivalent substitutions, so the present invention is by no means limited to the above embodiments.

Industrial applications

The safety lamp holder with a pointed needle cylinder of the present invention is suitable for various types of bayonet lamp holders and screw lamp holders that require protection against electric shock.

Claims

Rights request

A safety lamp holder with a bayonet lamp cap with a spiked needle cylinder, characterized in that it comprises: a bayonet tube, which has a tubular central positioning base at the bottom, two centrally positioned The positioning vertical sleeves on both sides of the seat and a ring-shaped flange integrally formed by the outer peripheral surface of the lower part of the bayonet tube extending radially;

A wafer with a central hole fixed on the exposed portion of the spiked needle cylinder passing through the through hole of the fixed disk through the central hole, and the height of the spiked needle cylinder on the inner bottom surface of the bayonet cylinder is greater than The height of the two electric contact round-head rods on the inner bottom surface of the bayonet tube;

2. The safety lamp holder for a bayonet lamp cap according to claim 1, wherein each of the electric contact round-head rods has a round head, a rod portion, and a diameter and a diameter between the head and the rod portion. Larger than the shoulders of the head and the rod, the top of the vertical sleeve has an inwardly extending inner ring; each electrical contact round rod is installed in a vertical sleeve with its head protruding upward from the inward projection of the vertical sleeve A ring, and the first spring is sleeved in the rod portion of the electric contact round rod and is located between the metal conductive sheet and the shoulder of the electric contact round rod.

3. The safety lamp holder of the bayonet lamp cap according to claim 1, wherein the positioning vertical sleeve comprises a jacket integrated with the bayonet tube and an inner sleeve fixedly installed in the jacket, The inner sleeve has an inward convex ring extending inward, and the upper part of each electric contact round head rod protrudes upward from the inner convex ring of the inner sleeve. The first spring is sleeved under the shoulder and electrically contacts the inner rod portion and is located in the inner portion. Between the conductive metal sheet and the shoulder in the sleeve.

4. The safety lamp holder for a bayonet lamp cap according to claim 1, wherein the first pair and the second pair of spring leaf switches are provided with contacts, which are vertically opposed to each other and their distance Are equal.

5. The safety lamp holder of the bayonet lamp cap according to claim 1 or 2, wherein the spiked needle cylinder is composed of a rod portion and a head having a diameter larger than the rod portion, and The inner hole is stepped. The diameter of the stepped hole in the lower part of the stepped inner hole is smaller than the diameter of the upper hole. The second spring is sleeved on the shaft of the pointed needle cylinder and located on the head of the pointed needle cylinder. Between the rear end surface and the front end surface of the stepped hole of the center positioning seat.

6. The safety lamp holder of the bayonet lamp cap according to claim 1 or 2, wherein a center of a lower bottom surface of the fixing plate has a pipe portion extending downward so that a wafer mounted therebelow and the first pair The free ends of the spring leaves are kept at a certain distance.

7. A safety lamp holder with a screw base with a spiked needle cylinder, comprising a shell with an opening at the bottom and a metal screw sleeve installed in the shell, characterized in that it further comprises three contact spring pieces, That is, a first spring piece, a second spring piece, and a third spring piece, wherein one end of each of the first and second spring pieces is respectively fixed below the bottom side of the housing through an insulating sleeve and is vertically separated from each other at a certain interval. One end of the third spring piece is fixed below the other side of the bottom of the housing through an insulating sleeve, and a contact-type spike bar is vertically separated from the other end of the third spring piece by a certain distance from each other, And an elastic telescopic device capable of simultaneously elastically moving the pointed needle cylinder relative to the third spring piece and elastically moving the first spring piece relative to the second spring piece.

8. The safety lamp holder of the screw base according to claim 7, wherein the elastic telescopic device comprises:

A fixing seat, which is a circular tube integrally formed by a part of the hole wall at the bottom of the casing extending downward and is on the same central axis as the casing;

A pushing block is a rectangular plate. The pushing block is movably disposed in the opening in a relatively fixed seat, and its horizontal plate portion includes a small hole, and the upper surface and the opening of the casing are located. Planarly aligned, and the bottom end of its vertical rod portion abuts against the first spring leaf; and

A spring is installed in the inner hole of the fixing seat and is located between the bottom wall of the fixing seat and the pushing block; the contact-type spike needle cylinder has a spike-shaped tapered head and a diameter smaller than the head Through the free end of the rod, insert it into the small hole of the push block, pass through the hole of the spring and the fixed seat, and make its tapered head It is above the pushing block and the bottom end of the rod extends out of the fixed seat;

A wafer, which has a central hole and is fixed on the rod part protruding from the bottom end of the fixing seat through the central hole.

9. The safety lamp holder of the screw base according to claim 8, wherein a side of a peripheral wall of the fixing seat has a long axial notch, and a rod portion of the pushing block can be inserted and located in the notch. And can move up and down in the length direction of the notch.

10. The safety lamp holder of a screw base according to claim 7, further comprising a conductive member, which electrically connects the first spring piece and the metal screw sleeve by a screw crimping method,

11. The safety lamp holder of the screw base according to claim 7, wherein the relative distance between the first and second spring pieces and the relative distance between the third spring piece and the bottom end of the rod portion of the metal rod Are equal.