CA1325822C - Fuse ejector - Google Patents
Fuse ejectorInfo
- Publication number
- CA1325822C CA1325822C CA000595956A CA595956A CA1325822C CA 1325822 C CA1325822 C CA 1325822C CA 000595956 A CA000595956 A CA 000595956A CA 595956 A CA595956 A CA 595956A CA 1325822 C CA1325822 C CA 1325822C
- Authority
- CA
- Canada
- Prior art keywords
- fuse
- ejector
- clip
- jaws
- clips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B33/00—Hand tools not covered by any other group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0208—Tools for inserting and removing fuses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fuses (AREA)
- Switch Cases, Indication, And Locking (AREA)
Abstract
ABSTRACT
A fuse ejector for clip mounted fuses comprising a pivotally mounted "L" shaped insulating member. The member has one leg extending under the ferrule of the fuse and the other projecting up beside the fuse to a location easily accessible by the user. The pivotal mounting is supported within the fuse clip and the leg which extends under the fer-rule lies within the fuse clip. In operation, the user pushes on the leg projecting up beside and beyond the fuse causing the insulating member to rotate on its pivotal mount-ing and the leg extending under the ferrule to force the ferrule up and out of the fuse clip.
A fuse ejector for clip mounted fuses comprising a pivotally mounted "L" shaped insulating member. The member has one leg extending under the ferrule of the fuse and the other projecting up beside the fuse to a location easily accessible by the user. The pivotal mounting is supported within the fuse clip and the leg which extends under the fer-rule lies within the fuse clip. In operation, the user pushes on the leg projecting up beside and beyond the fuse causing the insulating member to rotate on its pivotal mount-ing and the leg extending under the ferrule to force the ferrule up and out of the fuse clip.
Description
FUSE EJECTOR
BACKGROUND OF THE INVENTION
, FIELD OF THE INVENTION
This invention relates to fuse ejectors for incor-poration into fusible switches and fuse holders.
DESCRIPTION OF THE PRIOR ART
In the design of fusible switches and fuse holders, insulating barriers are usually located between adjacent fuses.
The fuses are mounted in fuse clips which are connected to their respective line connectors or switchblades. The fuse clips comprise spring jaws and substantial force is usually required to extract the fuse from the fuse clip. Forces in the neighbourhood of 20 - 30 lbs. may be required. Because of the presence of the insulating barriers, there is frequently no room to permit grasping the fuse and the plier-type fuse removal tool cannot be inserted between the fuses. This pro-blem is particularly evident with short fat fuses, particularly the Canadian type J fuse. Unfortunately, one common technique is to use a screwdriver or the like to lever the fuse loose.
There is the possibility excessive force may be applied and cause damage to the fuse or to the adjacent fuse or portions of the assembly.
Prior solutions have usually involved loops surround-` ing the end of the fuse which loops have an extension which may be pulled, thus pulling one end of the fuse loose from the fuse clip This form of plastic loop is shown in V.S. Patent No.
BACKGROUND OF THE INVENTION
, FIELD OF THE INVENTION
This invention relates to fuse ejectors for incor-poration into fusible switches and fuse holders.
DESCRIPTION OF THE PRIOR ART
In the design of fusible switches and fuse holders, insulating barriers are usually located between adjacent fuses.
The fuses are mounted in fuse clips which are connected to their respective line connectors or switchblades. The fuse clips comprise spring jaws and substantial force is usually required to extract the fuse from the fuse clip. Forces in the neighbourhood of 20 - 30 lbs. may be required. Because of the presence of the insulating barriers, there is frequently no room to permit grasping the fuse and the plier-type fuse removal tool cannot be inserted between the fuses. This pro-blem is particularly evident with short fat fuses, particularly the Canadian type J fuse. Unfortunately, one common technique is to use a screwdriver or the like to lever the fuse loose.
There is the possibility excessive force may be applied and cause damage to the fuse or to the adjacent fuse or portions of the assembly.
Prior solutions have usually involved loops surround-` ing the end of the fuse which loops have an extension which may be pulled, thus pulling one end of the fuse loose from the fuse clip This form of plastic loop is shown in V.S. Patent No.
2 1~2~822 CO/89 4,696,528, issued September 29, 1987. It will be seen thatthe whole force required to extract the end of the fuse from the fuse clip must be supplied by the operator by pulling on the puller. After the fuse has come free from the fuse clip, the puller is restricted from further motion by means of an extensible plastic member. It will be seen, however, that the remaining force, which cannot immediately be terminated, is then applied to the apparatus which not only may be destructive ; to the apparatus, but also may hurt the operator where the finger is inserted through the puller.
A similar extractor is shown in U.S. Patent No.
4,671,588, issued June 9, 1987, which operates with a rolling motion which makes the fuse somewhat easier to remove but is still subject to the same objection in that the remnant force ~.
is still applied to the puller after the fuse has been removed and can result either in impact force on the mechanism as a whole or removal of the puller from its mounting post. It will also be seen that both the preceding pullers require modi-fication of the structure to accommodate the puller.
SUMMARY OF THE INVENTION
The present invention, rather than being an extractor is an ejector, which may be fitted to a standard fusible switch ;~ or fuse holder without modification of the design. The mechan-ism is mounted on the fuse clip attaching screw and, by means of a lever action, ejects one end of the fuse from the fuse ;~ clip. The direction of force applied to the ejector is essent-ially parallel to the fuse. The ejector consists of a lever .. : :
A similar extractor is shown in U.S. Patent No.
4,671,588, issued June 9, 1987, which operates with a rolling motion which makes the fuse somewhat easier to remove but is still subject to the same objection in that the remnant force ~.
is still applied to the puller after the fuse has been removed and can result either in impact force on the mechanism as a whole or removal of the puller from its mounting post. It will also be seen that both the preceding pullers require modi-fication of the structure to accommodate the puller.
SUMMARY OF THE INVENTION
The present invention, rather than being an extractor is an ejector, which may be fitted to a standard fusible switch ;~ or fuse holder without modification of the design. The mechan-ism is mounted on the fuse clip attaching screw and, by means of a lever action, ejects one end of the fuse from the fuse ;~ clip. The direction of force applied to the ejector is essent-ially parallel to the fuse. The ejector consists of a lever .. : :
3 ~32~8~2 CO/89 mechanism pivotally mounted in the fuse holder with an insul-ating portion projecting outward beyond the end of the fuse in a location easily accessible to the operator. The force is applied to the lever in the direction parallel to the fuse and the lever rotates ejecting the end of the fuse from the fuse clip. At the same time it rotates releasing the finger of the operator so that excessive force is not applied to the fuse holder or switch mechanism itself. In its inoperative position, the ejector applies no substantial force on the end of the fuse.
It is, therefore, an object of the invention to pro-vide a simple ejector mechanism which may be fitted to fusible switches or fuse holders to permit the convenient ejection of one end of the fuse.
It is a further object of the invention to provide a fuse ejector which does not apply objectionable loads to the switch mechanism or box or holder during its operation.
It is a further object of this invention to provide fuse ejectors which may be retrofitted to many fused switch mechanisms and fuse clips without modification of the mechanism itself.
~ These and other objects may be obtained in a manner '~ which will become apparent in the detailed description of the ~' invention and the drawings wherein:
Figure 1 is a view, partially in section, of a switch including a fuse mounted therein and incorporating the fuse ejector of our invention.
-:
; .; . . .
", ' , .' : ' ' . . ,: , .
It is, therefore, an object of the invention to pro-vide a simple ejector mechanism which may be fitted to fusible switches or fuse holders to permit the convenient ejection of one end of the fuse.
It is a further object of the invention to provide a fuse ejector which does not apply objectionable loads to the switch mechanism or box or holder during its operation.
It is a further object of this invention to provide fuse ejectors which may be retrofitted to many fused switch mechanisms and fuse clips without modification of the mechanism itself.
~ These and other objects may be obtained in a manner '~ which will become apparent in the detailed description of the ~' invention and the drawings wherein:
Figure 1 is a view, partially in section, of a switch including a fuse mounted therein and incorporating the fuse ejector of our invention.
-:
; .; . . .
", ' , .' : ' ' . . ,: , .
., Figure 2 is a view similar to Figure 1 showing the fuse in its ejected position.
Figure 3a is a view of the ejector mechanism as viewed from III-III in Figure 1.
Figure 3b is a view of the ejector mechanism at section IV-IV in Figure 3a.
Considering first Figure 1, there is shown a fuse 5 mounted between a pair of fuse clips 6 and 7. As will be seen, the fuse clip 7 is connected to the pivot of a blade switch, the pivot mounting being designated 8. The fuse clips 6 and 7 are mounted on the insulating portion of the switch body, this whole insulated body being designated 9. Each fuse clip is mounted on the body by means of a screw. The screw 10 mounts ~; the fuse clip 6 and screw 11 mounts the fuse clip 7.
To this point the apparatus is a standard fusible `!~ switch, howevex, it will be seen that the switch has been modi-j fied by introducing an ejector comprising a lever member 12 mounted on a mounting bracket 13. The lever member 12 and its mounting bracket 13 may be more clearly seen in Figures 3a and 3b. The lever member 12 may be seen to consist of two essent-ial parts, projecting arm 14 which is accessible from the front of the fusible switch and protrudes beyond the plane of the surfaces of the fuses in the switch, and a portion which pro-'! jects sideways and protrudes underneath the fuse designated 15.
, 25 The lower surface of member 15 is of arcuate shape, curved to blend smoothly into the operating member at 16, as may be seen more clearly in Figure 3b. The lower portion of the ejector !, ;
. ~
,.: : .' . ` `
.~ :
, .
mechanism, that is portion 15, includes in its lower surface a trough having sidewalls 17 and 18. Each of these walls has a longitudinal protrusion substantially parallel to surface 15. These protrusions 19 and 20 extend from a web 21 (Figure 3b) formed in the lower surface of portion 15 to the outermost arcuate surface of member 15. The bracket 13 is arranged to fit closely within the trough walls 17 and 18 with sufficient clearance to permit movement. A pair of notches in the mount-ing bracket, designated 22 and 23, co-operate with the protrus-ions 19 and 20 to captivate the mounting bracket 13 in the trough and prevent it from being drawn vertically downward out of the trough once it has been slid into position. This up-wardly projecting portion of the mounting bracket 13 is joined to the lower mounting portion of the bracket substantially at right angles. The lower mounting portion, includes a perfor-ation of sufficient diameter to accept the mounting screw 11.
In order to retrofit a switch with the ejector, the fuse or fuses are removed, the fuse clip mounting screw 11 is removed, the mounting bracket 13 is aligned over the hole in the fuse clip and screw 11 once more installed and tightened.
The ejector lever now may be rotated on its bracket into its upright position as illustrated in Figure 1 and the fuse may be reinserted.
In operation, the user simply pushes on arm 14 in the direction shown in Figure 1 by arrow 26, causing the ejector mechanism to rotate on its mounting bracket 13. The ejector rocks on its arcuate lower surface and the outer tip 27 of , , :
. :
,, .. ~ , , ~ ' ... .,: . ' 6 132~822 CO/89 member 15 pushes the ferrule of the fuse upwards until the position shown in Figure 2 is reached when the ferrule of the fuse is essentially comp;etely disconnected from the fuse clip. A protrusion 29 on one of the sidewalls of the body 9 extends under and serves to support bracket 13 during this operation.
It will be seen that the force applied by the user is parallel to the fuse body and as the fuse is released the lever rotates in such a manner that the force applied by the user's hand will be reduced because the lever is approaching the direction of the arrow 26. It will, therefore, be evident that any remnant force, which the user is unable to stop apply-ing, does not cause substantial impact on the fuse mechanism or any part of the fused switch.
While the apparatus has been described in association , with a single fuse, it will be evident that one apparatus will ,~ be mounted within the fuse clip at one end of each of the fuses within the fused switch. It will also be evident that the particular material chosen for the purpose is a matter of choice, but it will be advantageous if the lever mechanism is molded from a relatively strong insulating material and the mounting bracket formed from a stiff, even springy, metallic member which need only be chosen for its strength since it does not itself carry any of the electrical current in the switch. It will also be evident that the particular proport-ions of the mechanism are not critical but it is advantageous that the lower portion be pivoted directly below the fuse ferrule and, therefore, the structure shown, with the mounting "
:, ' . ' - .
7 132~822 CO/89 bracket placed within the fuse clip, ensures its proper loc-ation.
The lever portion, obviously, must be offset to one side to permit it to project between adjacent fuses. It may, however, be quite thin and thus the fuses may be placed as closely together as is electrically permissible. If the mat-erial chosen for the lever is suitable, it will not in any way affect the rating of the apparatus. It will also be evident that the dimensions of the device will depend upon the size of the fuses being dealt with and, in most cases, the projection 15 will closely approach the diameter of the fuse ferrule.
While the invention has been described in association with a fusible switch, it is evident that it is applicable to any clip mounted fuse equipment whether or not the equipment includes other electrical equipment.
,, .
Figure 3a is a view of the ejector mechanism as viewed from III-III in Figure 1.
Figure 3b is a view of the ejector mechanism at section IV-IV in Figure 3a.
Considering first Figure 1, there is shown a fuse 5 mounted between a pair of fuse clips 6 and 7. As will be seen, the fuse clip 7 is connected to the pivot of a blade switch, the pivot mounting being designated 8. The fuse clips 6 and 7 are mounted on the insulating portion of the switch body, this whole insulated body being designated 9. Each fuse clip is mounted on the body by means of a screw. The screw 10 mounts ~; the fuse clip 6 and screw 11 mounts the fuse clip 7.
To this point the apparatus is a standard fusible `!~ switch, howevex, it will be seen that the switch has been modi-j fied by introducing an ejector comprising a lever member 12 mounted on a mounting bracket 13. The lever member 12 and its mounting bracket 13 may be more clearly seen in Figures 3a and 3b. The lever member 12 may be seen to consist of two essent-ial parts, projecting arm 14 which is accessible from the front of the fusible switch and protrudes beyond the plane of the surfaces of the fuses in the switch, and a portion which pro-'! jects sideways and protrudes underneath the fuse designated 15.
, 25 The lower surface of member 15 is of arcuate shape, curved to blend smoothly into the operating member at 16, as may be seen more clearly in Figure 3b. The lower portion of the ejector !, ;
. ~
,.: : .' . ` `
.~ :
, .
mechanism, that is portion 15, includes in its lower surface a trough having sidewalls 17 and 18. Each of these walls has a longitudinal protrusion substantially parallel to surface 15. These protrusions 19 and 20 extend from a web 21 (Figure 3b) formed in the lower surface of portion 15 to the outermost arcuate surface of member 15. The bracket 13 is arranged to fit closely within the trough walls 17 and 18 with sufficient clearance to permit movement. A pair of notches in the mount-ing bracket, designated 22 and 23, co-operate with the protrus-ions 19 and 20 to captivate the mounting bracket 13 in the trough and prevent it from being drawn vertically downward out of the trough once it has been slid into position. This up-wardly projecting portion of the mounting bracket 13 is joined to the lower mounting portion of the bracket substantially at right angles. The lower mounting portion, includes a perfor-ation of sufficient diameter to accept the mounting screw 11.
In order to retrofit a switch with the ejector, the fuse or fuses are removed, the fuse clip mounting screw 11 is removed, the mounting bracket 13 is aligned over the hole in the fuse clip and screw 11 once more installed and tightened.
The ejector lever now may be rotated on its bracket into its upright position as illustrated in Figure 1 and the fuse may be reinserted.
In operation, the user simply pushes on arm 14 in the direction shown in Figure 1 by arrow 26, causing the ejector mechanism to rotate on its mounting bracket 13. The ejector rocks on its arcuate lower surface and the outer tip 27 of , , :
. :
,, .. ~ , , ~ ' ... .,: . ' 6 132~822 CO/89 member 15 pushes the ferrule of the fuse upwards until the position shown in Figure 2 is reached when the ferrule of the fuse is essentially comp;etely disconnected from the fuse clip. A protrusion 29 on one of the sidewalls of the body 9 extends under and serves to support bracket 13 during this operation.
It will be seen that the force applied by the user is parallel to the fuse body and as the fuse is released the lever rotates in such a manner that the force applied by the user's hand will be reduced because the lever is approaching the direction of the arrow 26. It will, therefore, be evident that any remnant force, which the user is unable to stop apply-ing, does not cause substantial impact on the fuse mechanism or any part of the fused switch.
While the apparatus has been described in association , with a single fuse, it will be evident that one apparatus will ,~ be mounted within the fuse clip at one end of each of the fuses within the fused switch. It will also be evident that the particular material chosen for the purpose is a matter of choice, but it will be advantageous if the lever mechanism is molded from a relatively strong insulating material and the mounting bracket formed from a stiff, even springy, metallic member which need only be chosen for its strength since it does not itself carry any of the electrical current in the switch. It will also be evident that the particular proport-ions of the mechanism are not critical but it is advantageous that the lower portion be pivoted directly below the fuse ferrule and, therefore, the structure shown, with the mounting "
:, ' . ' - .
7 132~822 CO/89 bracket placed within the fuse clip, ensures its proper loc-ation.
The lever portion, obviously, must be offset to one side to permit it to project between adjacent fuses. It may, however, be quite thin and thus the fuses may be placed as closely together as is electrically permissible. If the mat-erial chosen for the lever is suitable, it will not in any way affect the rating of the apparatus. It will also be evident that the dimensions of the device will depend upon the size of the fuses being dealt with and, in most cases, the projection 15 will closely approach the diameter of the fuse ferrule.
While the invention has been described in association with a fusible switch, it is evident that it is applicable to any clip mounted fuse equipment whether or not the equipment includes other electrical equipment.
,, .
Claims (5)
1. A fuse ejector for a fuse mounted in the jaws of fuse clips which in turn are mounted by fastening devices within an electrical enclosure, said ejector comprising an "L" shaped member having a lower arm and a projecting arm of insulating material, said member being pivotally mounted on a bracket mounted by one of said fastening devices between the jaws of one of said fuse clips with said lower arm extend-ing under said fuse and between said jaws and said projecting arm displaced sideways from said lower arm and extending adjacent one side of said fuse and substantially perpendicular to said fuse when mounted in said one fuse clip and projecting substantially beyond a plane tangent to the surface of said fuse when mounted in its respective fuse clips.
2 . A fuse ejector as claimed in Claim 1 wherein the bracket is a metallic member fastened by the same fastening device which retains the said one fuse clip in said enclosure.
3 . A fuse ejector for clip mounted fuses which are retained within their enclosure by engagement with the jaws of their associated fuse clips, said fuse clips being mounted on an insulating structure comprising an insulating body under-lying said fuse clips by means of screws passing through holes in the bases of said fuse clips between their jaws, said ejector comprising an "L" shaped insulating member having a lower shorter leg, and an upper longer leg said lower shorter leg of said member lying between the jaws of a fuse clip and mounted to pivot about an axis adjacent the junction of the legs of the "L" shaped insulating member by means of a mounting bracket lying between said jaws of said fuse clip and retained by the screw mounting said fuse clip, and overlying said insulating body, said upper longer leg of said "L" shaped insulating member being arranged to lie adjacent one side of the fuse mounted in said fuse clip and extend beyond a plane tangential to the surface of said fuse substantially perpend-icular to the axis of said fuse whereby force applied to said longer leg substantially in the direction of the axis of said fuse causes said ejector to rotate about its axis and the end of said shorter leg of said insulating member to engage the ferrule of said fuse forcing the fuse up and out of engage-ment with the jaws of said fuse clip.
4. A fuse ejector as claimed in Claim 3 wherein said mounting bracket comprises an "L" shaped metallic member with one end providing the pivot mounting of said "L"
shaped insulating member and the other end retained by said screw.
shaped insulating member and the other end retained by said screw.
5. A fuse ejector as claimed in Claim 4 wherein said "L" shaped metallic member retains said insulating member by means of a notch which engages a protrusion extending from a wall of said insulating member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000595956A CA1325822C (en) | 1989-04-06 | 1989-04-06 | Fuse ejector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000595956A CA1325822C (en) | 1989-04-06 | 1989-04-06 | Fuse ejector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1325822C true CA1325822C (en) | 1994-01-04 |
Family
ID=4139867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000595956A Expired - Fee Related CA1325822C (en) | 1989-04-06 | 1989-04-06 | Fuse ejector |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1325822C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293511A (en) * | 2019-06-14 | 2019-10-01 | 平高集团有限公司 | A kind of moving arcing contact handling tooling |
-
1989
- 1989-04-06 CA CA000595956A patent/CA1325822C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293511A (en) * | 2019-06-14 | 2019-10-01 | 平高集团有限公司 | A kind of moving arcing contact handling tooling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |