JPS63266726A - Shock protection fuse holder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to the field of automatic circuit interruption, and more particularly.

Related to electrical fuse holders.

The present invention is based on the Shock-Safe Fuse Holder Assembly (Shock-3) filed on November 12, 1986.
afe Fuseholder As5ea+bly)
This is a continuation-in-part of U.S. Patent Application No. 926,611, entitled J.

BACKGROUND OF THE INVENTION Electrical fuse holders, in one commonly used form, are designed such that the socket body is mounted to a panel and the fuse is inserted through the front of the panel. The fuse is held in place by a knob that fits into an axially extending cylindrical passage opening in the front of the socket body. The cylindrical passageway, oriented for receiving a knob or side terminal, is interrupted by slots which interrupt the continuity of the cylindrical surface and create an effective seal between this surface and the knob. prevent it from forming.

Such a seal, if this surface were continuous, could easily be formed by an O-ring seal supported on the outer end of the knob.

Such knobs generally have a pair of three-figure bayonet contact fingers that engage the side terminals of the socket body when the knob is fully inserted and rotated in the locking direction. It is interlocked with the protrusion provided. Vallner dated February 7, 1978.
In one side terminal design, disclosed in U.S. Pat.
This spring experiences an axial force when the knob is fully inserted. To remove the knob, first push the knob axially inward to separate the interlocked part, rotate the knob in the opposite direction to the locking direction, and then release the force and release the knob from the main body by the force of the retaining spring. It is done by letting

Although such fuse holder assemblies allow for quicker insertion of the fuse retention knob than other types with screw threads in the knob and socket body, the fuse retention spring does not Careful insertion may cause deformation.

The fuse holder disclosed in Urani U.S. Pat. It has a main body. The side terminal of the fuse holder disclosed in Mr. Urani's patent is
Although it does not have an easily deformable fuse retention spring as used in Mr. Warna's fuse holder, this side terminal and the side terminals disclosed in Mr. Warna's patent were made with loose tolerances. In some cases, as in one embodiment of the invention, no constant pre-acting electrical contact force is applied to the mating portion of the contact finger of the knob and the side terminal of the socket body.

Urani's fuse holder and U.S. Patent No. 4°072.
Yet another common problem arises with the Kriens fuse holder disclosed in '385 when the knob of the fuse holder is of the type having a head that includes a screwdriver slot.

That is, this head does not protrude beyond the outer surface of the fuse holder body (or does not protrude in this way in the absence of spring force) when the knob is finally positioned within the socket body. into the slot in the knob head and removing the knob by rotating it to the unlocked position only when the force of the spring forces the knob outward to the point where it can be grasped into and removed from the body of the fuse holder. Can be done. However.

Remove the fuse that the operator suspects and
It is common to find that it is blown and temporarily put the knob back into the holder while you go looking for a replacement fuse. At this point, the normal knob spring force on the fuse (which, as previously discussed, would normally cause the knob to eject in its release direction) is lost. Therefore, when an attempt is made to remove the knob by rotating the knob with a screwdriver to bring the spring into this relaxed state, the knob ends up recessed within the fuse holder body where it cannot be grasped by the user. I can see that Therefore, a sharp knife or the like is required to raise the knob from the fuse holder body. A retaining spring is supported within a conductive sleeve mounted as an extension of the knob assembly and the fuse received therein. A similar situation is encountered when the end cap of a pipe corrodes to the extent that it binds to the sleeve. Under these conditions, no spring force acts on the fuse to assist in removal of the knob.

DESCRIPTION OF THE INVENTION In a preferred embodiment of the invention, a side terminal design of the socket body is provided which is capable of accepting standard knobs with five-shaped bayonet contact fingers of the above-mentioned Kriens, Urani and other fuse holders. be done. Each J-shaped contact finger has an axially inwardly projecting frame portion from which a circumferentially curved free end portion projects laterally; terminating in a prominent hook-forming projection. The unique socket body side terminal of the present invention is preferably, but not necessarily, a cylindrical metal sleeve mounted around an outwardly projecting hollow insulating post forming a portion of the interior of the socket body. Good too.

The post projects outside the socket body in spaced relation to the cylindrical interior passageway to provide clearance for a side terminal sleeve attached thereto. The hollow post insulates the cylindrical sleeve from contact with the inner terminals of the cartridge fuse supported by the knob when the knob is inserted into the passageway of the socket body.

One of the unique features of the side terminal sleeve is the location and shape of the axially outwardly extending resilient arms projecting from the outer end of the sleeve.

These axially projecting arms have contact forming projections on their inner surfaces. When the knob assembly is fully inserted axially into the passageway of the socket body, the ends of the five-shaped contact fingers contact the pair of abutment surfaces and the coil spring of the knob assembly is compressed. preferable. As the knob is rotated toward the locked position, the figure-5 contact fingers engage and wipe these arm contacts, forcing the arm radially outward, even if the part in question has a loose tolerance. to form a low resistance contact between the contact finger and the arm. Such rotation continues until the contact fingers of the knob abut another pair of abutment shoulders.

When the knob assembly is released, the coil spring forces the assembly outward, causing the contact fingers of the knob to
Rather than the resilient arm described above, it rests on the abutment shoulder of the side terminal and interlocks with a portion thereof. However, the contact fingers remain in good contact with the contacts on these arms.

Other features of the invention to be described herein relate to the location and construction of the rigid channel-forming fingers of the side terminal sleeves, which allow the knob assembly to be partially and fully inserted into the socket body. forming inner and outer abutment shoulders and finger receiving channels to be engaged by the knob contacting fingers at various locations on the assembly while doing so.

When the knob assembly is rotated to its final position and released, the head of the knob assembly is retracted within the socket assembly (if so designed). As in the case of known fuse holders, when the knob assembly is to be removed from the socket body, it is pushed axially inward and then rotated in the opposite direction to that followed during insertion of the knob assembly. . The resiliency of the compressed coil spring in the knob assembly pushes the assembly outward and out of the socket body, and the head of the knob assembly can be grasped by hand to remove the knob assembly from the socket body. .

If the knob assembly does not contain a fuse capable of compressing a resilient coil spring within the sleeve of the knob assembly, the knob The problem remains how to remove the assembly from the socket body. While this problem may be overcome by certain exemplary means disclosed in the aforementioned patent application Ser. No. 962,611, according to another feature of the present invention, a This is most effectively resolved by a pair of spiral cam surfaces. These helical cam surfaces are preferably formed by a pair of outwardly extending protrusions, each forming a helical cam surface on one side and an abutment shoulder on the other side, which provides a rigid The knob assembly cooperates with the channel-forming fingers of the side terminals to lock the knob assembly against rotation in its final position on the socket body. The highest points of these helical cam surfaces are initially engaged by the axially inner ends of the J-shaped fingers of the knob assembly when the knob assembly is pushed axially inward. The width of these fingers is such that they do not engage the channel forming fingers of the side terminals until they reach the abutment shoulder at the bottom of the helical cam surface. When said abutment shoulder is reached, a further rotation brings the contact finger of the knob into the channel of the rigid side terminal finger. If the knob assembly initially rests against the outer wall of the rigid side terminal finger, rotating the knob assembly in either direction causes the heel of the contact finger of the knob to contact the helical cam surface. In doing so, further inward force applied to the knob assembly causes the knob assembly to rotate toward its locked position. These helical cam surfaces also act as guides to move the knob assembly outwardly from its retracted, locked position when the knob assembly is rotated in the opposite direction, causing the knob assembly to Even if there is no fuse, i.e., the coil spring is not compressed to create a release force for the knob assembly, the knob assembly will be in a position that protrudes from the socket body so that it can be grasped by the user for removal. Make it.

A further feature of the invention resides in the design of the parts such that the passageway of the socket assembly into which the knob assembly is fitted can be a continuous cylindrical surface at least at its entrance portion. In such cases, the knob is provided with an O-ring that can seal the knob assembly within the socket body. Known fuse holder constructions have required orientation of the knob assembly in one of two diametrically opposed directions to enable insertion into the socket body. This is generally accomplished by providing a guide channel at the entrance to the socket body passageway so that the knob assembly can only be inserted into one of these two positions. This is not required by the present invention. This is because, as previously discussed, the particular construction of the sleeve arms, fingers and camming projections of the side terminals allows the knob assembly to be inserted in any insertion direction. To avoid using similar channels to receive and orient the side terminals during assembly of the fuse holder,
The socket body is formed from two separate parts: an outer socket body part and an inner socket body part. Preferably, the side terminal sleeve is initially mounted on said insulating post projecting from the outer end of the inner socket body part. This subassembly is then inserted into the guide channel at the inner end of the outer socket body part. The two socket body parts are then ultrasonically welded together.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The above and other features of the present invention will be readily understood from the following detailed description taken in conjunction with the accompanying drawings.

Referring to FIGS. 1 and 3A, the fuse holder shown in FIG. 1 includes a socket body 1, into which a knob assembly 2 supporting a cartridge fuse 4 is removably mounted. Fuse 4 is captured within knob assembly 2 as described below. The fuse 4 is the knob assembly 2
a cylindrical axial passageway 3 formed in the socket assembly 1;
The knob assembly 2 projects axially inwardly from the knob assembly 2 when inserted into the inlet of the knob assembly 2. The knob assembly must be oriented in a certain predetermined orientation relative to the socket assembly upon insertion.

Unlike known fuse holders which required a guide slot at the entrance to the socket body passage, the knob assembly 2 can be properly inserted in any orientation. The passageway 3 in the socket body is defined for most of its length by a continuous cylindrical surface and is compressed into the cylindrical surface 3 by compression around an O-ring 40d attached to the annular group 5 at the outer end of the knob assembly 2. A seal is made against it.

Due to the unique configuration of the fuse holder of the present invention.

The procedure for installing the knob assembly 2 is to first fully insert the knob assembly into the socket assembly 1 such that the knob assembly rests against the stop shoulder described below. When rotated in either direction while applying a slight inward force to the knob assembly by applying a screwdriver to the slot 42 on the outer surface of the knob 2, the knob assembly is automatically guided along the cam surface and rotated. The knob assembly is rotated to a locked position defined by the stop shoulder. Knob assembly 2
When you release the knob assembly, the force from the compression coil spring 24 of the knob assembly automatically moves the knob assembly slightly outward;
A point is reached where the knob assembly assumes a final locking position with low contact resistance.

In the final locked position of the knob assembly 2, the outer surface of the knob assembly is slightly retracted within the socket assembly 1, as shown in FIG. 3A. When the fuse 4 is within the knob assembly 2, the force provided by the coil spring 24 causes the knob assembly to be ejected from the socket assembly 1 by rotating the knob assembly in the opposite direction. However, the third C
When the fuse 4 is removed from the knob assembly 2 as shown in the figures, another feature of the invention allows the knob assembly to be released by simply applying a reverse rotation to the retracted knob assembly, allowing the knob assembly to be manually removed. It can be grabbed and removed.

In FIGS. 38-3C, the fuse holder of the present invention is shown vertically mounted in the opening 6a of the panel 6. This opening 6a has a flat-sided contour in order to receive the flat executive board 10a of the outer part IA of the knob body described below. This presidium has a screw thread 10 for receiving a fixing nut 8 having an internal thread 8a (FIG. 3A). The internal thread 8a is screwed into a thread 10 on the socket body outer part IA of the socket assembly 1. Nats 8 is panel 6
, and pull the flanged head portion 9 of the socket body outer part IA against the panel 6.

As noted above, another feature of the present invention relates to the unique design of the side terminal 14 of the socket body assembly, described below, which has an axial connection from the inner end of the knob assembly 2. The design relates to ensuring a constant pre-imposed wiping force on the mating portion with the five-shaped contact fingers 20b-20b projecting from the front.

Having described above the basic advantageous features of the fuse holder of the present invention, the preferred detailed structure of the parts that achieve these advantageous features will now be described.

In the present invention, the side terminal 14 can be installed into the socket body from the inner end of one socket body part, and is configured so that the connection between the inlet end of the cylindrical surface of the socket body passage 3 is not interrupted. . This is made possible by the unique construction of the socket body assembly 1, namely two separate parts, an outer socket body part IA and an inner socket body part IB, made of a suitable insulating material.

The side terminals 14 are initially formed as stamped flat metal plates, shaped into a cylindrical shape, and are interconnected by projecting tabs 14f, as best shown in FIGS. 78-7B. locked. This tab is
It is fitted into a slot 14f' having a corresponding shape.

The terminal 14 is.

It has a main body portion 14a (also shown in Figure 1) forming a sleeve, the diameter of which is slightly smaller than the diameter of the cylindrical passage 3, as best shown in Figure 3A. , ' Projecting axially inward from the inner or rear end of this sleeve portion 14a is a terminal tab 14e;
This lies in a plane beyond the circumference of the cylindrical sleeve portion 14a.

Projecting from the forward or outer end of sleeve portion 14a at diametrically opposed locations thereof.

A pair of axially outwardly extending resilient contact arms 14b-
14b. Projecting inwardly from the radially inwardly opposed surfaces of these arms are dimple contacts 14b.
'-14b' (Figure 7A). Arm 14b
- 14b is formed as a cylindrical segment, located off the periphery of the sleeve portion 14a and formed in the wall of the inner or rear end of the cylindrical passageway 3 in the outer part IA of the socket body. It is fitted into the slot 28cm28c. (The rear end portion 3' of the cylindrical passage 3 is in the inner portion IB of the socket body.) Resilient arm 14b-
Extending generally parallel to and spaced a short distance in the same direction from 14b is a relatively rigid channel-forming finger 14cm 14c. These fingers have a radially inwardly open circumferential channel 2.
4-24 (see FIGS. 1 and 7C). These channels are defined by an inner abutment shoulder 24a and an outer abutment shoulder 24d. The relatively rigid fingers 14cm 14c of the side terminals fit into correspondingly disposed slots 28b-28b formed in the inner or rear end wall of the cylindrical passageway 3 of the outer part IA of the socket body. be done.

The outer or front end of the sleeve portion 14a includes an abutment shoulder 14h at a point adjacent to the lower or inner end of an outwardly sloping cam surface 14g'-14g' formed on one side of the cam-forming projections 14g-14g. -14h is provided. The steep sides of these protrusions form the side abutting shoulders, i.e. the stoppers 14g''-
Form 14g #l. These cam surfaces 14g'-14
g' is.

The flat stamped side terminal portions shown in FIG. 7A form a helical surface when shaped into a cylindrical piece. The highest point of cam surface 14g'-14g' is.

It lies in the same transverse plane P2 as the flat outer abutment shoulders 24b-24b of the rigid fingers 14cm 14c of the side terminals.

The projections 14g-14g form an extension of the sleeve portion 14a such that it fits snugly into the wall of the cylindrical passageway 3 of the outer part IA of the socket body.

The inner part IB of the socket body has a hollow cylindrical base 35 (
1), and a plane 35a extends over its entire axial length. A flange 30 projects therefrom and forms a first axially facing annular abutment shoulder 30a. The outer end surface of the base 35 forms a second axially facing annular abutment shoulder 35b. This shoulder portion 35b
Projecting outwardly from is a reduced diameter cylindrical hollow post 27 that projects and slides into the interior of the cylindrical sleeve portion 14a of the side terminal 14. Hollow post 27 prevents side terminal 14 from contacting inner end terminal 18 of fuse 4 during insertion of knob assembly 2 into passage 3 of the socket assembly. Side terminal sleeve 14
The rear end, that is, the inner end of a contacts the annular shoulder 35b,
The hollow post 27 to which the side terminal 14 is attached is attached to the third
As best shown in Figures A and 6, it fits into the cylindrical passageway 3 of the socket body outer part IA.

The inner part IB of the socket body can only take one orientation with respect to the side terminal 14 due to the flat part 35a, and the terminal tab 14e of the side terminal.

It can extend past the base 35 of the socket body inner part IB. Further, the positioning ribs 37-37 protrude forward from the annular shoulder portion 35b on both sides of the flat portion 35a. These ribs 37-37 fit into the same locating slots 28b-2 of the socket body outer part IA which receive the sleeve fingers 14cm 14c, as shown in FIG.
The slide is inserted into 8b.

Initially, as shown in FIG. 1, the sleeve 14 is placed over the hollow post 27 of the inner socket body part IB, and the assembly thereby formed is then oriented in the appropriate orientation and placed over the hollow post 27 of the socket body inner part IA. It is inserted at the rear or inner end. When the inner part of the socket main body 1 is completely inserted into the outer part of the socket main body, the inner surface of the outer part of the socket main body is inserted into the inner part of the socket main body I.
The two parts contact the shoulder part 30a provided on the outside of the flange 30 of B, and the two parts are the flange 30 and the socket body outer part I.
Ultrasonic welding is performed along the interface between A and the inner edge.

Figures 2 and 3 best show details of knob assembly 2.
Diagram A will be explained. As shown, the knob assembly 2 includes an insulated knob portion 40 and a knob contact finger 2.
0b-20b extends from the fuse receiving sleeve 20, the contact clip 22, and the coil spring 24.
It is equipped with The insulating knob portion 40 has a head portion 40a having a slot 42 for a screwdriver.

A skirt 40b extends from this head portion 40a and has a slightly smaller diameter than the passageway 3. The skirt 40b of the knob has an annular group 5 to which a resilient o-ring 40d is attached.

It projects from the skirt 40b and forms a seal against the wall of the passageway 3. The skirt 40b provides an internal passageway 4 in which the fuse receiving sleeve 20 is snugly fitted.
0b''. The sleeve 20 is initially a flat die-cut metal plate whose sleeve-forming portion 20a is bent into a cylindrical shape and interlocked by a locking tab 20c that fits into a slot 20d. Ru.

Pair of knurled rib receiving slots 20a-2
0a is the inside 40b''-40b' of the knob skirt 40b
The rib 40c protruding from is lockably received. Sleeve portion 20a has spaced internal teeth 20f at its outer end. The sleeve 20 is the skirt 40b
Friction fit inside the cylinder. A contact clip 22 is located within the sleeve 20 . The contact clip has a pair of facing arms 22a-22a;
The outer terminal 16 of the fuse 4 is wedged between these to pull the arms apart from each other and to apply a gripping force around the fuse body. The outer end of the contact clip has a projecting ear 22b (FIG. 2);
These are forced into the forward end of the sleeve portion 20a and are brought under the end of the sleeve 20 between the spaced teeth 2Of.

Terminals 16 at the outer end of cartridge fuse 4 abut the ends of coil springs 24 that are gripped by contact clip arms 22a-22a and are frictionally fitted within contact clips 22. The inner part IB of the socket body has a laterally projecting terminal 12 lockingly fitted at its end. this is.

This portion is exposed within the cylindrical passage 3 and is brought into contact with the terminal 18 at the inner end of the fuse 4.

Just before the knob assembly reaches its innermost position within socket body portion IB, fuse terminal 18 hits terminal 12, compressing coil spring 24 within the knob assembly. This exerts an outward force on the knob assembly that acts when the user releases an inward force on the knob assembly.

Projecting axially inward from the rear or inner end of the knob sleeve 20 is the aforementioned five-shaped contact finger 20b-.
It is 20b. Each of these contact fingers passes through an axially extending portion 20b-1 that projects beyond the periphery of the cylindrical outer surface of the five-sleeve portion 20a. Each finger further has a circumferentially curved portion 20b-2 at its inner end, which portion is an annular portion between the hollow insulating post 27 and the trunk 10b of the socket body outer portion IA. Each circumferentially curved finger portion 20 fits within a cylindrical space 50 (FIG. 3A).
b-2 terminates in an outwardly projecting hook-forming projection 20b-3.

To understand how the five-shaped fingers 20b-20b interact with the various axially extending protrusions of the side terminal 14, reference is made to FIGS. 7A-7E.

The rear or inner ends of the contact fingers 20b-20b have a flat surface 5 lying in a plane perpendicular to the axis of the fuse holder.
2-52. The free end 56 of circumferentially curved portion 20b-2 of each finger 20b is shown as an inclined surface terminating at an outermost point 58. This point 58
and the knee or inner end 54 of the end surface 52 of each finger is shown as dimension D1 in FIG. 7C. 7th A
The figure shows a plane P2 transverse to the axis of the fuse holder, which plane corresponds to the cam surfaces 14g'-14g' of the side terminals.
and the outer abutment shoulder 24b-24 of the rigid side terminal finger 14c-14c.
It passes through b. Sleeve portion 14a of side terminal 14
The abutting shoulders 14h-14h provided at the front end of the helical cam surface 14g are located in a plane P1 parallel to the plane P2, and
'-14g' is located adjacent to the innermost edge.

This plane PI is the closest locking finger 14C
intersects each surface 14g' at a point a distance D2 (FIG. 7C) from the side of the surface. The distance D2 is.

Channel 24 of side terminal fingers 1'4c-14c of dimension D1 or more of knob contacting fingers 20b-20b such that the free ends of these fingers are rigid when they reach abutment shoulders 14h-14h. You must be able to go inside.

Thus, in all possible orientations of the knob assembly, the flat end surfaces 52-52 of the fingers 20b-20b are located at the peak portions of the cam-forming projections 14g-14g and outwardly from the rigid side terminal fingers l4c-14c. abutting shoulder portion 24b of
-24b or cam surface 14g' -14g
It corresponds to a point along '. These knob fingers first abut the abutment shoulders 24b-24b, and if the knob assembly is pushed axially inward and rotated in either direction from this position, the inner surface 52 of each contact finger 20b When an axially inward force is subsequently applied to the six-knob assembly with heel end 54 abutting one camming surface 14g' of side terminal projections 14g-14g (FIG. 7B), camming surface 14g'-1
Under the action of 4g', the fuse knob assembly rotates in a direction to move contact fingers 20b-20b into engagement with the nearest side terminal contact arms 14b-14b. These contact fingers are contact fingers 20b
-20b flat end 52-52 is cam surface 14g'-14
0 then the terminal 18 body at the inner end of the fuse 4, which preferably engages the contact projections of the side terminal arms 14b-14b before reaching the abutment shoulder 14h-14h at the bottom of the fuse 4; The innermost terminal 12 exposed at the bottom of the knob assembly passage 3'' formed by the socket body inner part IB is reached. Further axially inward movement of the knob assembly from the point where the inner fuse terminal 18 first contacts the terminal 12 of the socket body interior IB progressively compresses the coil spring 24.

When the end surfaces 52 of the contact fingers 20b-20b reach the bottom of these cam surfaces 14h-14h (FIG. 7C),
These end faces have rigid side terminal fingers.
at a point near the entrance of channel 24-24. Further rotation of the knob assembly in this same direction causes finger 20b to
-20b's end will contact the abutment shoulder 14g"-14g" on the steep side of the cam-forming projection 14g-14g (see Figure 7D).6 The shaft then attaches to the knob assembly. Upon release of the directional force, the knob assembly and their fingers 20b-20b are moved forward and the circumferentially curved portion 20b-2 is attached to the rigid side terminal finger 14cm1.
4c (seventh
The hook-forming protrusion 20b-3 of the fingers 20b-20b is located on the side closest to the abutment shoulder 14g of the side terminal projection 14g-14g and the rigid side terminal finger 14c-14c. closely engaged between the edges.

To remove the knob assembly from the socket assembly, the knob assembly is pressed and rotated in a direction opposite to that previously described. Then, even though the knob assembly does not have a fuse that compresses the coil spring 24, the contact finger 20b-2
The helical surface 14g of the cam-forming projection 14g'-14g' has an associated heel end 54-54 of the outer surface 52-52 of 0b.
-It weighs 14g. Thereafter, the knob assembly is guided progressively outwardly to an outermost position so that it protrudes over the socket assembly and can be grasped and removed from the socket assembly by hand.

From the above description, it can be seen that the present invention provides for the contact finger 20b of the knob.
-20b and an arm 14 extending in the axial direction of the side terminal 14.
It will be apparent that a highly reliable fuse holder assembly is provided which consistently provides a constant contact wiping force between contact projections 14b'-14b' of b-14b. Furthermore, there is an O-ring 4 between the knob assembly and the socket assembly.
0d forms a watertight seal. Finally, even when the fuse 4 is removed from the knob assembly, the knob assembly can be easily removed from the socket assembly without the use of special tools.

Although the present invention has been described above with reference to preferred embodiments, it will be apparent to those skilled in the art that various changes can be made without departing from the scope of the invention. All such changes and modifications that come within the scope of the present invention without being limiting are intended to be encompassed within the scope of the following claims.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the socket body portion and the cartridge fuse and knob assembly forming a subassembly that can be inserted as a unit into the inlet opening of the socket body portion; FIG. An exploded perspective view of each part constituting the knob assembly shown in the assembled form in the figure;
3A is a longitudinal sectional view when the assembly of the parts shown in FIG. 1 is attached to the opening of the panel together with the O-ring; FIG. 3B is a view corresponding to FIG. 1; Remove the cartridge fuse shown in to replace the fuse.
FIG. 7 shows the knob assembly installed in its normal, recessed, resting position within the socket body. FIG. 3C is a view corresponding to FIG. 3B, in which the knob assembly is rotated one rotation from the position shown in FIG. 3B;
A fourth view shows the forward end of the knob assembly protruding from the socket assembly to permit grasping and removal in accordance with one feature of the invention. 5 is a cross-sectional view taken along section 5-5 of the assembly shown in FIG. 6 is a cross-sectional view taken along section 6-6 of the assembly of FIG. 3A, showing the socket to side terminal sleeve; FIG. FIG. 3 is a diagram showing an interlock state of main body parts. Figures 7A, 7B, 7C, 7D and 7E each illustrate the side terminal arms of the unique socket body of the present invention as the knob assembly is gradually moved toward the socket body. , illustrating five different positions of the protrusion and fingers relative to the knob assembly. 1... Socket assembly IA... Socket main body outer part 1B... Socket main body inner part 2... Knob assembly 3... Cylindrical axial passage 4... Cartridge fuse 5. ...Group 6...Mounting panel 14...
Side terminal 14a...Sleeve portion 14b...Contact arm 14c...Channel forming finger 20...Sleeve 20a...Sleeve forming portion 20b...5-shaped contact finger 20c...Lock tab 20e ... Rib receiver slot 22 ... Contact clip 22a ... Arm 22b ... Ear 24 ... Coil spring 14g ... Cam forming projection 14g' ... Cam surface 14g that slopes outward , 24
b, 30a, 35b...Abutting shoulders 16, 18...Fuse terminal 27...Hollow post 28b...Positioning slot 30...Flange 35...Hollow cylinder base 37... Rib 40...Insulating knob part 40a...Head part 40b...Skirt 40d...0 ring 42...Screwdriver slot 52...Flat surface

Claims (10)

[Claims] (1) A socket body formed of an insulating material having a fuse receiving passage extending axially inwardly from an outer surface for receiving a cartridge-type electrical fuse, the socket body being the innermost part of the passage. and a fixed side terminal provided in the passage,
Said innermost terminal projects axially inwardly from and is supported by a knob located recessed within said socket body in a final position and is engaged with an inner terminal of said cartridge fuse; A side terminal of the cartridge is arranged to be in electrical contact with at least a first axially extending knob contact finger, the contact finger being adapted to electrically connect to an outer terminal of the cartridge fuse at the knob. and further comprising resilient biasing means such that a fuse inserted in the knob applies an axially outward ejection force to the knob by distorting the biasing means. In a fuse holder socket assembly configured in a fuse holder socket assembly, the side terminal includes at least a first fixed helical cam surface portion that is arranged to contact an inner end of a contact finger of the knob upon insertion of the knob. , the first helical camming surface portion initially guiding the knob to move both axially and circumferentially toward a locked position, in which the first helical camming surface portion guides the contact finger. Less than one-half turn of the knob can interlock with the side terminal, the side terminal further having an abutment shoulder facing axially inwardly against each of the knob contacting fingers. and wherein when the knob is rotated in the circumferential direction to the final locking position, an associated contact finger is pressed against the abutment shoulder by the biasing means, and the first helical portion of the side terminal is in contact with the knob. said first contact finger is arranged to advance transversely when the fuse is rotated from its locked position and configured to eject the knob from said passageway even when the fuse is removed from the body and the biasing means is unable to eject the knob. A socket assembly for a fuse holder, characterized in that: (2) a socket body formed of an insulating material having a fuse-receiving passage extending axially inwardly from an outer surface for receiving a cartridge-type electrical fuse, the socket body being the innermost part of the passage; and a side terminal in the passageway, the innermost terminal projecting axially inwardly from the knob to engage an inner terminal of a cartridge fuse supported by the knob. and the side terminal is arranged to be in electrical contact with at least a first axially extending J-shaped knob contact finger, the contact finger being in contact with an outer side of the cartridge fuse at the knob. is arranged to be electrically connected to the terminal of the knob, and further includes resilient biasing means, the biasing means being adapted to be axially outwardly biased by the fuse inserted in the knob deflecting the biasing means. for applying a release force to the knob, and further provided with an axially inwardly directed abutment shoulder for each of the knob contacting fingers for rotating the knob circumferentially to a final locking position. Then, in a socket body assembly of a fuse holder, wherein the associated contact fingers are configured to be pressed against the abutment shoulder by the biasing means, the side terminals of the socket body:
means for engaging each of the knob contact fingers,
means configured as a resilient cantilevered contact arm projecting axially outwardly and deformable radially outwardly, the contact arm having a radially inwardly projecting contact point thereof; on a radially inwardly facing side, the contact being engaged by one of the knob contact fingers to a wipe contact thereby deflecting radially outwardly when the knob is rotated to the locked position. and wherein the biasing means is arranged to remain in contact with the knob when urging it to its final position. (3) the side terminal has a second helical contact finger engaging portion substantially the same as the first helical portion, the portion being located on an opposite side of the socket body; , the socket assembly receiving an inner end of a second knob contact finger substantially similar to the first knob contact finger and disposed on an opposite side of the knob; a second axially inwardly directed abutment shoulder relative to the finger, the associated second contact finger being biased by the biasing means when the knob is rotated circumferentially to the final locking position; 2. The fuse holder socket assembly of claim 1, wherein said assembly includes said second knob contact finger against said abutment shoulder. (4) The fuse holder socket assembly according to claim 1, 2 or 3, wherein each abutting shoulder is a part of a side terminal of the socket body. (5) the side terminal of the socket body has a resilient contact arm that projects axially outwardly and is deformable radially outwardly to engage each of the knob contact fingers; Each arm has a radially inwardly projecting contact on its inside which is engaged by one of the knob contact fingers with the wipe contact when the knob is rotated to the locking position and 4. A fuse holder socket assembly as claimed in claim 1, 2 or 3, wherein the means are arranged to maintain contact with the knob as it is forced into its final position relative to said abutment shoulder. (6) each abutment shoulder is part of a side terminal of the socket body, and each abutment shoulder is formed by an axially inwardly directed rigid channel-forming finger; projecting radially outwardly from the outer end of said side terminal to form a laterally open channel in each finger of said side terminal and associated knob when said knob is moved to its locked position; Contact fingers are threaded into this channel, each knob contact finger having a hook-forming projection at its end, which rotates the knob to a locked position to relieve hand force on the knob. Claim 1 wherein said rigid side terminal finger is hooked around said rigid side terminal finger.
3. A socket assembly for a fuse holder according to , 2 or 3. (7) The side terminal of said socket comprises a cylindrical sleeve part, said sleeve part passing over a hollow insulating post forming part of said socket body, said insulating post attaching the knob to the socket body. The terminals at the inner end of the cartridge fuse are prevented from abutting the side terminals during insertion, and each of the rigid channel-forming fingers and helical portions protrudes axially outwardly at the outer end of the sleeve portion. The fuse holder socket assembly according to claim 1 or 2, wherein the fuse holder socket assembly is a part. (8) The socket body includes an outer part of the socket body and an inner part of the socket body, a part of the passage passing through the outer part of the socket body in the axial direction, and a side part of the socket body. A terminal can be inserted into the socket body passageway from an inner end of the socket body outer part, and the socket body inner part has an axial passageway that is continuous with the passageway of the socket body outer part. and a terminal inside the socket body is arranged so as to be exposed to the passage,
The outer end of the inner inner part of the socket body has a hollow post to which the side terminal is attached, and the hollow post is inserted into the outer part of the socket body together with the side terminal,
The inner and outer parts of the socket body are fixed to each other after they are assembled, and the entrance of the socket body passage is a substantially completely cylindrical part, so that the knob can be completely inserted into the socket body. 4. A fuse holder socket assembly as claimed in claim 1, 2 or 3, wherein an O-ring supported by said knob is capable of sealingly engaging said cylindrical portion when said knob is opened. (9) The fuse holder socket assembly according to claim 8, wherein the O-ring is combined with and supported by the knob. (10) Each helical portion of the side terminal forms one side of an axially outwardly extending protrusion, the opposite side of which is arranged to stop rotation of the knob when rotated in the circumferential direction. 4. The socket body of a fuse holder according to claim 1, further comprising a contact shoulder.