CN210577846U

CN210577846U - Charging device, cleaning system, cleaning equipment and charging gun

Info

Publication number: CN210577846U
Application number: CN201921464376.2U
Authority: CN
Inventors: 张志淳; 卢泽辉
Original assignee: Beijing Rockrobo Technology Co Ltd
Current assignee: Beijing Rockrobo Technology Co Ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-05-19
Anticipated expiration: 2029-09-03

Abstract

The utility model provides a charging device, cleaning system, cleaning device and rifle that charges. The charging device comprises a charger female seat, an overcharge protection device and a charging gun. The charger female seat is connected with the battery; the overcharge protection device includes a locking member and a push rod member. The locking component is movable along the radial direction between an opening position far away from the charger female seat and a locking position close to the charger female seat; the push rod member is movable in an axial direction between an initial position away from the female charger holder and a compressed position close to the female charger holder. The charging gun is used for charging the battery and is provided with a plug-in part and a leaning part. In the process of charging the battery, the locking component is in a locking position and locks the charging gun, the abutting part abuts against the push rod component to position the push rod component at a compression position, after the charging of the battery is completed, the locking component is in an opening position and releases the charging gun, and the push rod component moves to an initial position, so that the battery is in a non-charging state to prevent the overcharge phenomenon of the battery.

Description

Charging device, cleaning system, cleaning equipment and charging gun

Technical Field

The utility model relates to a burnisher field especially relates to a charging device, cleaning system, cleaning device and rifle that charges.

Background

Large cleaning equipment, electric vehicles, and the like are generally equipped with a rechargeable battery. In the case of a lithium battery, when the lithium battery is continuously charged with a large current, a battery cell having a high degree of deterioration in the lithium battery is easily charged to an excessively high battery voltage. When overcharge occurs, the material inside the battery cell of the lithium battery decomposes to generate combustible gas, which increases impedance and further causes temperature rise.

Therefore, there is a need to provide a charging device, a cleaning system, a cleaning apparatus and a charging gun to at least partially solve the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

In order to solve the above problem, according to a first aspect of the present invention, a charging device is disclosed, which includes:

the charger female seat is connected with the battery; and

an overcharge protection device, comprising:

a locking member movable in a radial direction between an open position away from the female charger seat and a locked position adjacent to the female charger seat; and

a push rod member axially movable between an initial position away from the female charger seat and a compressed position adjacent to the female charger seat; and

the charging gun is used for charging the battery and is provided with an insertion part and an abutting part arranged on the outer side of the insertion part, the insertion part is used for being inserted into the charger female seat to be electrically connected with the charger female seat, the abutting part is used for abutting against the push rod part,

wherein, during charging of the battery, the locking member is in the locking position and locks the charging gun, the abutment portion abuts against the push rod member to position the push rod member in the compressed position,

after the battery is charged, the locking component is located at the opening position and releases the charging gun, and the push rod component moves towards the initial position to push the insertion part to move in the direction away from the charger female seat, so that the battery is in a non-charging state.

According to a second aspect of the present invention, a cleaning system is disclosed, comprising:

a cleaning device, the cleaning device comprising:

a battery;

the charger female seat is connected with the battery; and

an overcharge protection device, comprising:

According to the utility model discloses a third aspect discloses a cleaning device, and it includes:

a battery;

the charger female seat is connected with the battery; and

an overcharge protection device, comprising:

a pusher member axially movable between an initial position away from the female charger seat and a compressed position adjacent the female charger seat.

According to the utility model discloses a fourth aspect discloses a rifle charges for give according to the second aspect cleaning device charge, the rifle charges has grafting portion and sets up the portion of supporting in the grafting portion outside, grafting portion be used for peg graft extremely female seat of charger with female seat of charger electricity is connected, support to support the portion be used for supporting and support the push rod part.

According to the charging device of the utility model, in the process of charging the battery, the locking component can lock the charging gun to prevent the charging gun from moving relative to the charger female seat, so that the charging gun is always in a charging state, and the abutting part of the charging gun abuts against the push rod component of the cleaning device to position the push rod component at a compression position; after the battery is charged, the locking component can release the charging gun, the push rod component moves to the initial position from the compression position to apply thrust to the abutting part, so that the insertion part is electrically connected with the charger female seat to be disconnected, the battery is in a non-charging state, and the overcharge phenomenon of the battery is prevented.

Drawings

The following drawings of the embodiments of the present invention are provided as a part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a partial structural view of a charging device according to a preferred embodiment of the present invention, in which only a battery, a female charger holder, an overcharge protection device, and a charging gun are shown, and a locking member of the overcharge protection device is in a locking position and a push rod member is in a compressed position;

FIG. 2 is a partial schematic structural view of the charging device of FIG. 1, in which only the battery, the charger female housing, the overcharge protection device, and the charging gun are shown, and the locking member of the overcharge protection device is in an open position and the plunger member is in an initial position;

FIG. 3 is a schematic view of the charging gun of FIG. 1;

FIG. 4 is a partial schematic structural view of the charging device of FIG. 1, showing only the battery, the charger female socket and the plunger assembly of the overcharge protection device;

FIG. 5 is another partial schematic view of the cleaning device of FIG. 4, showing only the battery and the female charger holder;

FIG. 6 is a schematic cross-sectional view of the cleaning system of FIG. 1 with the pusher member of the overcharge protection device in a compressed position;

FIG. 7 is a schematic cross-sectional view of the cleaning system of FIG. 2 with the tappet member of the overcharge protection device in an initial position;

FIG. 8 is a schematic cross-sectional view of the cleaning system of FIG. 2 with the plunger assembly of the overcharge protection device in an initial position.

Description of reference numerals:

10: battery 20: charger socket

21: the clamping portion 22: accommodating tank

30: overcharge protection device 31: locking member

32: the pusher member 33: electromagnet

34: the chucking section 35: push rod

36: biasing member 37: first side wall

38: second side wall 39: end wall

41: connection portion 50: charging gun

51: the insertion portion 52: abutting part

53: the projecting portion 54: buckle

55: the convex rib 56: push button

57: first projection 58: second projection

59: elastic piece

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

According to the utility model discloses an aspect provides a charging device. The charging device mainly includes a charger female housing 20, an overcharge protection device 30, and a charging gun 50. This charging device can use on large-scale cleaning equipment, for example floor cleaning machine, sweeper etc. can also use equipment such as electric automobile, the embodiment of the utility model provides a do not restrict to this.

The charging device according to the present embodiment will be described in detail below with reference to fig. 1 to 8.

As shown in fig. 1 and 2, the charger female socket 20 of the charging device is connected to the battery 10, for example, electrically via a wire. In the present embodiment, the battery 10 is a rechargeable battery, such as a lithium battery. The overcharge protection device 30 basically includes a locking member 31 and a push rod member 32. The locking member 31 is movable in a radial direction between an open position away from the female charger holder 20 and a locked position close to the female charger holder 20. The pusher member 32 is axially movable between an initial position away from the female charger holder 20 and a compressed position adjacent to the female charger holder 20. It is to be understood that fig. 1 and 2 only exemplarily show a partial structure of a charging device, and if the charging device is applied to a cleaning apparatus, the battery 10, the female charger holder 20, and the overcharge protection device 30 may be all disposed in a housing of the cleaning apparatus, and an opening is provided at a position of the housing corresponding to the female charger holder 20 so that the female charger holder 20 is engaged with the charging gun 50. In this document, in the charging device, "radial" refers to a radial direction of the charger female housing 20, and correspondingly, "axial" refers to an axial direction of the charger female housing 20.

In the present embodiment, the charging gun 50 is used to charge the battery 10. As shown in fig. 3, the charging gun 50 has a socket 51 and an abutting portion 52 provided outside the socket 51. The socket 51 is provided at one end of the charging gun 50 for being plugged to the female charger holder 20 to be electrically connected with the female charger holder 20 to charge the battery 10. The abutment 52 is for abutting against the push rod member 32.

Specifically, the abutment 52 includes a catch 54 and a rib 55. The catch 54 extends axially and is radially spaced from the spigot 51. The snap 54 may be used to snap to the snap portion 21 of the female charger holder 20, which will be described in detail below. The rib 55 extends axially and is circumferentially spaced from the catch 54. For example, the catch 54 and rib 55 may be spaced 180 apart. In this embodiment, the abutting portion 52 includes one catch 54 and one rib 55, but of course, the abutting portion 52 may include any suitable number of catches 54 and ribs 55, such as one catch 54 and two ribs 55, as desired. It should be noted that, in this document, regarding the charging gun 50, "radial" refers to a radial direction of the plug portion 51, and correspondingly, "axial" refers to an axial direction of the plug portion 51, and the radial direction of the female charger holder 20 is parallel to the radial direction of the plug portion 51, and the axial direction of the female charger holder 20 is parallel to the axial direction of the plug portion 51.

As shown in fig. 1 and 6, during charging of the battery 10, the locking member 31 is in the locking position and locks the charging gun 50, and the abutting portion 52 abuts against the push rod member 32 to position the push rod member 32 in the compressed position. As shown in fig. 2, after the charging of the battery 10 is completed, the locking unit 31 is in the open position and releases the charging gun 50, and the push rod unit 32 moves to the initial position to push the plug 51 to move in a direction away from the female charger holder 20, so that the battery is in the non-charging state. Therefore, in the process of charging the battery 10, the charging gun 50 can be prevented from moving relative to the charger female socket 20, so that the charging gun 50 is always in a charging state, and after the charging of the battery 10 is completed, the plug part 51 is electrically disconnected from the charger female socket 20, so that the battery 10 is in a non-charging state, the overcharge phenomenon of the battery 10 is prevented, the battery 10 is protected, and the service life of the battery 10 is prolonged.

As shown in fig. 1 and 2, the locking member 31 includes a pair of electromagnets 33, and the pair of electromagnets 33 are disposed on opposite sides of the female charger holder 20. When the locking member 31 is in the locking position, the pair of electromagnets 33 are opposite in magnetic polarity, and therefore the pair of electromagnets 33 attract each other and are locked to the charging gun 50; when the locking member 31 is in the open position, the pair of electromagnets 33 have the same magnetic pole, and therefore the pair of electromagnets 33 repel each other and disengage from the charging gun 50 to unlock the charging gun 50. It will be understood by those skilled in the art that the locking member 31 is not limited to the present embodiment, and the locking member 31 may include an actuator or an elastic member as needed.

In addition, the overcharge protection device 30 may further include a power supply system (not shown) and a detection device (not shown). The power supply system is used for supplying power to the electromagnet 33, and the detection device is used for detecting parameters such as electric quantity and voltage of the battery 10. During charging of the battery 10, the power supply system supplies power to the pair of electromagnets 33 such that the magnetic poles between the pair of electromagnets 33 are opposite, and the detection device detects a parameter of the battery 10. When the detection means detects that the parameter of the battery 10 does not reach the predetermined threshold value, the locking member 31 is always in the locking position, and when the parameter of the battery 10 reaches the predetermined threshold value, the power supply system supplies a reverse current to one of the pair of electromagnets 33, so that the magnetic poles between the pair of electromagnets 33 are the same and repel each other, thereby bringing the locking member 31 into the opening position.

As shown in fig. 1 to 3, the electromagnet 33 includes a chucking portion 34. The chucking part 34 is provided at one end of the electromagnet 33 and is constructed in a semicircular ring-shaped structure. Correspondingly, the charging gun 50 includes a projection 53, and the projection 53 is circumferentially disposed outside the socket 51 and connected to the rib 55. When the locking member 31 is in the locking position, the gripping parts 34 of the pair of electromagnets 33 abut against the outer peripheral surface of the insertion part 51 and against the side surfaces of the projecting parts 53, and the gripping parts 34 are further away from the female charger holder 20 in the radial direction with respect to the projecting parts 53, whereby the charging gun 50 can be prevented from being further away from the female charger holder 20 in the radial direction, and the phenomenon of interrupting the charging during the charging of the battery 10 can be prevented.

The push rod part 32 is sleeved outside the charger female socket 20. As shown in fig. 4 to 6, the push rod member 32 includes a push rod 35 sleeved outside the female charger seat 20 and a biasing member 36 disposed in the push rod 35, the push rod 35 is configured to abut against the abutting portion 52, and the biasing member 36 is configured to apply a pushing force to the push rod 35 in an axial direction away from the female charger seat 20. Specifically, the push rod 35 includes a first side wall 37 and a second side wall 38 extending in the circumferential direction, and an end wall 39 connecting the first side wall 37 and the second side wall 38, the first side wall 37 is located outside the second side wall 38, the biasing member 36 is circumferentially disposed between the first side wall 37 and the second side wall 38, and one end of the biasing member 36 abuts against the end wall 39, the other end abuts against the charger female socket 20, and the end wall 39 is used for abutting against the abutting portion 52.

Referring back to fig. 2, the push rod 35 may further include a connecting portion 41, the connecting portion 41 being configured to extend axially through the charger female socket 20 from an inner side of the end wall 39. Specifically, the connecting portion 41 is configured as a columnar structure, and a through hole through which the connecting portion 41 extends is provided on the female charger holder 20. A nut may be provided at a free end of the connection portion 41, and the nut is screwed on the connection portion 41 such that the push rod 35 is movably connected to the charger female socket 20. Fig. 2 shows an exemplary embodiment in which the plunger 35 comprises two spaced-apart connecting portions 41. It will be understood by those skilled in the art that the number of the connection portions 41 is not limited to the present embodiment, and the number of the connection portions 41 may be four or six as necessary.

As shown in fig. 4 and 5, the female charger holder 20 has a snap-in portion 21, and the snap-in portion 21 may be configured to extend in the axial direction and have a receiving groove 22 extending in the axial direction. Specifically, the receiving groove 22 may be configured in an elongated shape and have an opening located radially outward. One end of the buckle 54 of the charging gun 50 is used for being buckled to the buckling part 21 to prevent the charging gun 50 from being separated from the female charger seat 20.

As shown in fig. 3, the catch 54 includes a first projection 57 extending in the radial direction, the first projection 57 being provided at one end of the catch 54. When the clip 54 is snapped to the clip portion 21, the first protrusion 57 is at least partially disposed in the receiving groove 22. As shown in fig. 6, the first projection 57 is at least partially disposed in the receiving groove 22 and is axially spaced from the inner surface of the receiving groove 22 during charging of the battery 10. As shown in fig. 7, when the charging of the battery 10 is completed, the pushing rod member 32 pushes the charging gun 50 outward in the axial direction, so that the first protrusion 57 moves in the receiving groove 22 in the axial direction until it abuts against the inner surface of the receiving groove 22 in the axial direction, at which time the electrical connection of the plug portion 51 to the female charger holder 20 is disconnected, and the battery 10 is in the non-charging state. However, since the latch 54 is engaged with the latch portion 21 at this time, the plug portion 51 of the charging gun 50 cannot be pulled out from the charger female socket 20, and thus the charging gun 50 can be prevented from being damaged by dropping.

Referring back to fig. 3 and 8, the charging gun 50 also has a button 56, the button 56 being provided at the other end of the catch 54. Specifically, the catch 54 includes a second projection 58 extending in the radial direction, and the second projection 58 is provided at the other end of the catch 54, i.e., the end remote from the first projection 57. The second projection 58 may be configured as a columnar or hollow columnar structure. The second protrusion 58 is sleeved with an elastic member 59. The elastic member 59 may be a helical compression spring. The button 56 is captured between the housing of the charging gun 50 and the second projection 58.

With continued reference to fig. 8, when the button 56 is pressed, the catch 54 is tilted so that the end of the catch 54 remote from the button 56 moves in the direction opposite to the direction of movement of the button 56 to disengage from the catch 21, that is, the first projection 57 withdraws from the receiving groove 22, whereby the plug portion 51 can be pulled out from the female charger holder 20. When the pressure on the push button 56 is removed, the elastic member 59 can exert an elastic force on the catch 54, so that the push button 56 returns to the original position, i.e., against the housing of the charging gun 50.

According to the utility model discloses in the second aspect of the embodiment, still provide a cleaning system, cleaning device and rifle that charges. The cleaning system includes a cleaning device and a charging gun, and the charging gun is used to charge the cleaning device. The cleaning device may be a large cleaning device, such as a (hand or driver) sweeper, a scrubber, or also a small cleaning device for domestic use, such as a sweeping robot, a vacuum cleaner, etc.

The cleaning device includes a battery, a charger female housing, and an overcharge protection device. The battery, the charger female housing, and the overcharge protection device of the cleaning apparatus according to the second aspect have substantially the same structures as the battery 10, the charger female housing 20, and the overcharge protection device 30 of the charging device according to the first aspect, and the charging gun according to the second aspect has substantially the same structures as the charging gun 50 according to the first aspect, and therefore, for the sake of brevity, description thereof will be omitted.

According to the charging device of the utility model, in the process of charging the battery, the locking component can lock the charging gun to prevent the charging gun from moving relative to the charger female seat, so that the charging gun is always in a charging state, and the abutting part of the charging gun abuts against the push rod component of the cleaning device to position the push rod component at a compression position; after the battery is charged, the locking component can release the charging gun, the push rod component moves to the initial position from the compression position to apply thrust to the abutting part, so that the insertion part is electrically connected with the charger female seat to be disconnected, the battery is in a non-charging state, and the overcharge phenomenon of the battery is prevented. Furthermore, according to the utility model discloses charging device can be applicable to car technical field equally, is applied to electric automobile etc. for example.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.

Claims

1. A charging device, comprising:

the charger female seat is connected with the battery;

an overcharge protection device, comprising:

2. The charging device according to claim 1, wherein the locking member includes a pair of electromagnets disposed opposite to each other on both sides of the female charger holder, and having opposite poles and locked to the charging gun when the locking member is in the locking position, and having the same pole and disengaged from the charging gun when the locking member is in the opening position.

3. A charging device as claimed in claim 2, wherein said electromagnets include gripping portions, and said charging gun includes projecting portions provided on outer sides of said insertion portions, and said gripping portions of said pair of electromagnets are fitted on outer sides of said insertion portions and abut against said projecting portions and are radially farther from said female charger holder with respect to said projecting portions when said locking member is in said locking position.

4. The charging device according to claim 1, wherein the push rod component is sleeved outside the female charger seat, the push rod component comprises a push rod sleeved outside the female charger seat and a biasing member arranged in the push rod, the push rod is used for abutting against the abutting portion, and the biasing member can apply thrust far away from the female charger seat to the push rod along an axial direction.

5. A charging arrangement as claimed in claim 4, in which the push rod comprises first and second circumferentially extending side walls and an end wall connecting the side walls, the first side wall being located outwardly of the second side wall, the biasing member being disposed circumferentially between the first and second side walls and abutting the end wall, the end wall being for abutting the abutment.

6. A charging arrangement as claimed in claim 5, in which the push rod further comprises a connection portion configured to extend axially through the female charger holder from the inside of the end wall, such that the push rod is movably connected to the female charger holder.

7. The charging device as claimed in claim 5, wherein the abutting portion comprises a buckle, the female charger holder has a snap portion, and one end of the buckle is used for being buckled to the snap portion to prevent the charging gun from being separated from the female charger holder.

8. A charging arrangement as claimed in claim 7, in which the abutment comprises a rib circumferentially spaced from the catch, the end wall being adapted to abut the rib and the catch.

9. The charging device according to claim 7, wherein the charging gun has a button provided at the other end of the catch, and the catch tilts when the button is pressed so that the end of the catch remote from the button moves in a direction opposite to the direction of movement of the button to disengage from the catch portion.

10. A cleaning system, comprising:

a cleaning device, the cleaning device comprising:

a battery;

the charger female seat is connected with the battery; and

an overcharge protection device, comprising:

11. The cleaning system of claim 10, wherein the locking member comprises a pair of electromagnets disposed opposite each other on both sides of the female charger holder, wherein the pair of electromagnets have opposite poles and are locked to the charging gun when the locking member is in the locked position, and wherein the pair of electromagnets have the same pole and are disengaged from the charging gun when the locking member is in the open position.

12. The cleaning system of claim 11, wherein the electromagnets include gripping portions, the charging gun includes a projection disposed outside the insertion portion, and the gripping portions of the pair of electromagnets are nested outside the insertion portion and abut the projection and are radially further from the female charger holder relative to the projection when the locking member is in the locked position.

13. The cleaning system of claim 10, wherein the push rod member is sleeved outside the female charger seat, the push rod member comprises a push rod sleeved outside the female charger seat and a biasing member disposed in the push rod, the push rod is used for abutting against the abutting portion, and the biasing member can apply a thrust force far away from the female charger seat to the push rod along an axial direction.

14. The cleaning system of claim 13, wherein the pushrod includes first and second circumferentially extending sidewalls and an end wall connecting the first and second sidewalls, the first sidewall being located outside of the second sidewall, the biasing member being circumferentially disposed between the first and second sidewalls and abutting the end wall, the end wall for abutting the abutment.

15. The cleaning system of claim 14, wherein the pushrod further comprises a connecting portion configured to extend axially through the female charger seat from an inner side of the end wall such that the pushrod is movably connected to the female charger seat.

16. The cleaning system of claim 14, wherein the abutment portion comprises a snap, and the female charger seat has a snap portion, one end of the snap being configured to snap onto the snap portion to prevent the charging gun from being detached from the female charger seat.

17. The cleaning system of claim 16, wherein the abutment comprises a rib circumferentially spaced from the catch, the end wall for abutting the rib and the catch.

18. The cleaning system of claim 16, wherein the charging gun has a button disposed at the other end of the catch that tilts when pressed such that the end of the catch distal from the button moves in a direction opposite the direction of movement of the button to disengage from the catch.

19. A cleaning apparatus, comprising:

a battery;

the charger female seat is connected with the battery; and

an overcharge protection device, comprising:

20. The cleaning apparatus as recited in claim 19, wherein the locking member comprises a pair of electromagnets disposed opposite each other on both sides of the female charger holder, wherein the pair of electromagnets have opposite poles when the locking member is in the locked position, and wherein the pair of electromagnets have the same poles when the locking member is in the open position.

21. The cleaning apparatus defined in claim 20, wherein the electromagnet comprises a gripping portion configured in the shape of a semicircular ring.

22. The cleaning device as claimed in claim 19, wherein the push rod member is sleeved outside the female charger seat, the push rod member comprises a push rod sleeved outside the female charger seat and a biasing member disposed in the push rod, and the biasing member is capable of applying a thrust force to the push rod in an axial direction, the thrust force being away from the female charger seat.

23. The cleaning apparatus defined in claim 22, wherein the pushrod comprises first and second circumferentially extending sidewalls and an end wall connecting the first and second sidewalls, the first sidewall being located outside the second sidewall, the biasing element being disposed circumferentially between the first and second sidewalls.

24. The cleaning apparatus defined in claim 23, wherein the pushrod further comprises a connecting portion configured to extend axially through the female charger seat from an inner side of the end wall such that the pushrod is movably connected to the female charger seat.

25. The cleaning apparatus as recited in claim 23, wherein the female charger holder has a snap-fit portion having a receiving groove extending in a circumferential direction.

26. A charging gun for charging a cleaning device according to any one of claims 19 to 25, wherein the charging gun has a plug portion for being plugged to the female charger holder to be electrically connected therewith and an abutting portion provided outside the plug portion for abutting against the push rod member.

27. The charging gun of claim 26, wherein the abutment comprises a catch extending axially and radially spaced from the socket.

28. The charging gun of claim 27, wherein the abutment comprises a rib extending axially and circumferentially spaced from the catch.

29. The charging gun of claim 28, wherein the charging gun includes a projection circumferentially disposed outside the insertion portion and connected to the rib.

30. The charging gun of claim 27, wherein the charging gun has a button disposed at an end of the catch remote from the socket, the charging gun configured such that the catch tilts when the button is pressed such that the end of the catch remote from the button moves in a direction opposite to a direction of movement of the button.