CA2184507A1 - Cable drum and torsion-spring plug assembly - Google Patents
Cable drum and torsion-spring plug assemblyInfo
- Publication number
- CA2184507A1 CA2184507A1 CA002184507A CA2184507A CA2184507A1 CA 2184507 A1 CA2184507 A1 CA 2184507A1 CA 002184507 A CA002184507 A CA 002184507A CA 2184507 A CA2184507 A CA 2184507A CA 2184507 A1 CA2184507 A1 CA 2184507A1
- Authority
- CA
- Canada
- Prior art keywords
- torsion
- base
- cable drum
- spring
- drum
- 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.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F7/00—Accessories for wings not provided for in other groups of this subclass
- E05F7/06—Devices for taking the weight of the wing, arranged away from the hinge axis
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
- G10D13/00—Percussion musical instruments; Details or accessories therefor
- G10D13/01—General design of percussion musical instruments
- G10D13/02—Drums; Tambourines with drumheads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/50—Storage means for webs, tapes, or filamentary material
- B65H2701/51—Cores or reels characterised by the material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Storage Of Web-Like Or Filamentary Materials (AREA)
Abstract
The torsion-spring plug comprises a base and a spring-receiving body coaxially projecting from the base. The cable drum has a centrally-opened web and a cylindrical rim. The base of the plug is inserted into a removable locking engagement with the web of the drum for the purpose of forming a combined assembly that is suitable, for instance, in counterbalancing mechanisms.
Instead of providing the two parts molded together, the present assembly is modular and versatile since it allows to combine various models and sizes of drums and plugs.
Instead of providing the two parts molded together, the present assembly is modular and versatile since it allows to combine various models and sizes of drums and plugs.
Description
218~507 CABLE DRUM AND TORSION-SPRING PLUG ASSEMBLY
BACKGROUND
Counterbalancing mechanisms have been employed for many years. Common examples of use for such systems are garage doors in homes, commercial and industrial buildings. In some applications, they may be used with windows or panels. Counterbalancinq mechanisms provide a mechanical assistance for facilitating the opening and closing of these movable items. They allow a person to manipulate them easily and to use a smaller motor when powered assistance is provided.
Generally, counterbalancing mechanisms use drums which carry cables attached to the door (or to the similar item). The drums are usually provided near the sides of the door. The drums are connected to a torsion spring for storing or releasing the energy according to the movement of the door. One end of the spring is connected to one part of the mechanism and another is connected to a fixed structure, such as a wall, or a shaft connected to the wall. Other kinds of springs or even dead weights may be used as well.
Most conventional mechanisms use an independent plug for connecting one of the ends of the spring to the shaft to which the drum is connected. Some others comprise a plug made integral with the drum for connecting the spring directly thereto. An example of such device is found in U.S. patent No. 5,201,897 (see FIG. 4). Such construction requires that many molds be made according to the various possible combinations of models or sizes of drums and plugs.
SUMMARY
The object of the present invention is to provide a cable drum and torsion-spring plug assembly where the two parts are removably connected to each other for allowing to easily combine various models and sizes of drums and plugs.
More particularly, the object of the present invention is to provide a cable drum and torsion-spring plug assembly. The assembly comprises a plug having a base and a spring-receiving body coaxially projecting from the base. A drum, comprising a web and a cylindrical rim, is also provided. Connecting means are used for coaxially and removably connecting the base of the plug into a locking engagement with the web of the drum.
A non restrictive description of preferred embodiments will now be given with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front exploded perspective view of the assembly according to a possible embodiment of the present invention.
FIG. 2 is a rear perspective view of the assembly in FIG. 1, showing the drum and plug connected to each other.
FIG. 3 is an exploded perspective view of a counterbalancing mechanism using the assembly in FIG. 1.
FIG. 4 is a longitudinal cross-sectional view of the counterbalancing mechanism in FIG. 3.
FIG. 5 is a front perspective view of the assembly according to another possible embodiment of the present invention.
IDENTIFICATION OF THE COMPONENTS
The following is a list of the reference numerals, along with the names of the corresponding components, that are used in the appended drawings and in the description. This list is only given for the convenience of the readers and should not be interpreted as restricting the scope or spirit of the present invention.
plug (torsion-spring plug) 12 body 14 spiral grooves 16 base bearing 22 locking ring flanges (in the first embodiment) 34 bosses 38 side shoulders flanges (in the second embodiment) 42 holes 44 fasteners drum (cable drum) 52 rim 54 web holes 56 cable entry 58 central opening tongues 64 slots 100 counterbalancing mechanism 102 spring 104 shaft 106 connecting element 108 idler bushing 110 support bushing 112 support plate 218~507 DESCRIPTION
FIGS. 1 and 2 show a cable drum and torsion-spring plug assembly according to a first preferred embodiment of the present invention. The prevailing application of this assembly is in a counterbalancing mechanism, such as the one illustrated in FIGS. 3 and 4. This counterbalancing mechanism (100) may be used, for example, with domestic garage doors, commercial garage doors or truck doors. Alternatively, the assembly can be used in other locations or applications, such as windows or panels, including greenhouses.
As aforesaid, FIGS. 1 and 2 show a first example of a torsion-spring plug (10) according to the present invention. The plug (10) comprises a base (16) and a spring-receiving body (12) that is adapted to receive an end of the coil spring (102) of the counterbalancing system (100). The body (12) comprises spiral grooves (14) on the external surface thereof. The spiral grooves (14) are in both directions so that a left-hand or a right-hand coil spring end may be connected thereto, as described in U.S. patent No. 3,779,537 (Kalister) issued on 18 December 1973. Other shapes are also possible, as apparent to a person skilled in the art.
The body (12) is coaxially projecting ,from the base (16). The main function of the base (16) is to link the plug (10) and the drum (50) together, as explained further in the text.
The drum (50) is adapted to receive a cable (not shown) that winds on a cylindrical rim (52). One free end of the cable is secured to a cable entry (56) formed on the side of the rim (52). It should be noted at this point that the rim (52) may not be necessarily perfectly coaxial with the geometric center of the drum (50).
The drum (50) also comprises a central portion called a web (54) and which comprises a central opening (58). The web (54) may completely surround the opening (58) and is usually hemispherical.
Connecting means are provided in the present invention for coaxially and removably connecting the base (16) of the plug (10) into a locking engagement with the web (54) of the drum (50). This connection will allow both parts to rotate around a common axis, usually defined by a shaft such as the shaft (104) in the counterbalancing mechanism (100) in FIGS. 3 and 4. In use, there is no relative axial translation between the plug (10) and the drum (50).
In FIGS. 1 to 5, the connecting means comprises at least two spaced-apart flanges (30) axially projecting from the side of the base (16) opposite the body (12).
These flanges (30) are insertable in the central opening (58) of the web (54) that is sized and shaped for snugly receiving the flanges (30) therein. Preferably, the outer surface of the flanges (30) may be provided with bosses (34), interfering with the edge of the central opening (58), for maintaining the plug (10) connected to the drum (50). Alternatively, when the parts are made of metal for instance, the same result may be obtained by providing flanges (30) having an outer dimension slightly larger than the one of the location where they are inserted in the central opening (58).
Preferably, the central opening (58) comprises substantially radial tongues (60) spaced apart from each other and projecting inwardly from an edge of the central opening (58). These tongues (60) are provided in a number corresponding to the number of flanges (30). In the illustrated embodiment, there are four tongues (60) corresponding to four flanges (30). The tongues (60) are spaced-apart for receiving the flanges (30) between them in a locking engagement, thereby preventing a relative rotational movement.
A small slot (64) is provided between each tongue (60) to avoid sharp corners and to add flexibility of 218~507 the tongues (60). The slots (64) are particularly advantageous when the tongues (60) interfere with the flanges (30).
Also, each flange (30) may be provided with a pair of side shoulders (38) for delimiting the depth of insertion of the plug (10) inside the drum (50). In use, the side shoulders (38) rest on the tongues (60).
In some applications, the plug (10) may be provided with holding means for receiving and holding a bearing (20) coaxially mountable therein. The bearing (20) fits between the flanges (30) and is held by a locking ring (22) integral with the outer race of the bearing (20).
The locking ring (22) has outer tongues that lock in interfering engagement with the inner side of the flanges (30).
FIGS. 3 and 4 show an example of a counterbalancing mechanism (100) in which the present invention may be used. All the parts are mounted around the shaft (104).
Some are fixed in rotation with reference to the shaft (104) while others may rotate around it. One end of the spring (102), opposite the assembly, is secured to the shaft (104) by means of a connecting element (106) provided with bolts and comprising a spring-receiving body. An idler bushing (108) bears the front end of the plug (10) on the shaft (104). The idler bushing (108) is held in place by small bosses inside the plug (10). The bearing (20) and the idler bushing (108) allow the assembly to rotate around the shaft (104). The shaft (104) is connected to a support plate (112) by a support bushing (110). The support plate (112) is usually secured to a wall or the ceiling.
As aforesaid, there are many possible embodiments for the connecting means. In another embodiment shown in FIG. 5, the connecting means comprises at least two spaced-apart flanges (40) radially projecting from the base (16). Each flange (40) is provided with a hole (42). The web (54) also comprises holes (44), each sized 218~507 and positioned with reference to the hole (42) of one corresponding flange (40) for receiving a removable fastener (44) therethrough. An example of such removable fastener (44) is a set of bolts and nuts. Other kinds of fasteners (44), including rivets, are possible.
Although preferred embodiments of the invention have been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments and that various changes and modifications may be effected therein without departing from the scope or spirit of the invention.
BACKGROUND
Counterbalancing mechanisms have been employed for many years. Common examples of use for such systems are garage doors in homes, commercial and industrial buildings. In some applications, they may be used with windows or panels. Counterbalancinq mechanisms provide a mechanical assistance for facilitating the opening and closing of these movable items. They allow a person to manipulate them easily and to use a smaller motor when powered assistance is provided.
Generally, counterbalancing mechanisms use drums which carry cables attached to the door (or to the similar item). The drums are usually provided near the sides of the door. The drums are connected to a torsion spring for storing or releasing the energy according to the movement of the door. One end of the spring is connected to one part of the mechanism and another is connected to a fixed structure, such as a wall, or a shaft connected to the wall. Other kinds of springs or even dead weights may be used as well.
Most conventional mechanisms use an independent plug for connecting one of the ends of the spring to the shaft to which the drum is connected. Some others comprise a plug made integral with the drum for connecting the spring directly thereto. An example of such device is found in U.S. patent No. 5,201,897 (see FIG. 4). Such construction requires that many molds be made according to the various possible combinations of models or sizes of drums and plugs.
SUMMARY
The object of the present invention is to provide a cable drum and torsion-spring plug assembly where the two parts are removably connected to each other for allowing to easily combine various models and sizes of drums and plugs.
More particularly, the object of the present invention is to provide a cable drum and torsion-spring plug assembly. The assembly comprises a plug having a base and a spring-receiving body coaxially projecting from the base. A drum, comprising a web and a cylindrical rim, is also provided. Connecting means are used for coaxially and removably connecting the base of the plug into a locking engagement with the web of the drum.
A non restrictive description of preferred embodiments will now be given with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front exploded perspective view of the assembly according to a possible embodiment of the present invention.
FIG. 2 is a rear perspective view of the assembly in FIG. 1, showing the drum and plug connected to each other.
FIG. 3 is an exploded perspective view of a counterbalancing mechanism using the assembly in FIG. 1.
FIG. 4 is a longitudinal cross-sectional view of the counterbalancing mechanism in FIG. 3.
FIG. 5 is a front perspective view of the assembly according to another possible embodiment of the present invention.
IDENTIFICATION OF THE COMPONENTS
The following is a list of the reference numerals, along with the names of the corresponding components, that are used in the appended drawings and in the description. This list is only given for the convenience of the readers and should not be interpreted as restricting the scope or spirit of the present invention.
plug (torsion-spring plug) 12 body 14 spiral grooves 16 base bearing 22 locking ring flanges (in the first embodiment) 34 bosses 38 side shoulders flanges (in the second embodiment) 42 holes 44 fasteners drum (cable drum) 52 rim 54 web holes 56 cable entry 58 central opening tongues 64 slots 100 counterbalancing mechanism 102 spring 104 shaft 106 connecting element 108 idler bushing 110 support bushing 112 support plate 218~507 DESCRIPTION
FIGS. 1 and 2 show a cable drum and torsion-spring plug assembly according to a first preferred embodiment of the present invention. The prevailing application of this assembly is in a counterbalancing mechanism, such as the one illustrated in FIGS. 3 and 4. This counterbalancing mechanism (100) may be used, for example, with domestic garage doors, commercial garage doors or truck doors. Alternatively, the assembly can be used in other locations or applications, such as windows or panels, including greenhouses.
As aforesaid, FIGS. 1 and 2 show a first example of a torsion-spring plug (10) according to the present invention. The plug (10) comprises a base (16) and a spring-receiving body (12) that is adapted to receive an end of the coil spring (102) of the counterbalancing system (100). The body (12) comprises spiral grooves (14) on the external surface thereof. The spiral grooves (14) are in both directions so that a left-hand or a right-hand coil spring end may be connected thereto, as described in U.S. patent No. 3,779,537 (Kalister) issued on 18 December 1973. Other shapes are also possible, as apparent to a person skilled in the art.
The body (12) is coaxially projecting ,from the base (16). The main function of the base (16) is to link the plug (10) and the drum (50) together, as explained further in the text.
The drum (50) is adapted to receive a cable (not shown) that winds on a cylindrical rim (52). One free end of the cable is secured to a cable entry (56) formed on the side of the rim (52). It should be noted at this point that the rim (52) may not be necessarily perfectly coaxial with the geometric center of the drum (50).
The drum (50) also comprises a central portion called a web (54) and which comprises a central opening (58). The web (54) may completely surround the opening (58) and is usually hemispherical.
Connecting means are provided in the present invention for coaxially and removably connecting the base (16) of the plug (10) into a locking engagement with the web (54) of the drum (50). This connection will allow both parts to rotate around a common axis, usually defined by a shaft such as the shaft (104) in the counterbalancing mechanism (100) in FIGS. 3 and 4. In use, there is no relative axial translation between the plug (10) and the drum (50).
In FIGS. 1 to 5, the connecting means comprises at least two spaced-apart flanges (30) axially projecting from the side of the base (16) opposite the body (12).
These flanges (30) are insertable in the central opening (58) of the web (54) that is sized and shaped for snugly receiving the flanges (30) therein. Preferably, the outer surface of the flanges (30) may be provided with bosses (34), interfering with the edge of the central opening (58), for maintaining the plug (10) connected to the drum (50). Alternatively, when the parts are made of metal for instance, the same result may be obtained by providing flanges (30) having an outer dimension slightly larger than the one of the location where they are inserted in the central opening (58).
Preferably, the central opening (58) comprises substantially radial tongues (60) spaced apart from each other and projecting inwardly from an edge of the central opening (58). These tongues (60) are provided in a number corresponding to the number of flanges (30). In the illustrated embodiment, there are four tongues (60) corresponding to four flanges (30). The tongues (60) are spaced-apart for receiving the flanges (30) between them in a locking engagement, thereby preventing a relative rotational movement.
A small slot (64) is provided between each tongue (60) to avoid sharp corners and to add flexibility of 218~507 the tongues (60). The slots (64) are particularly advantageous when the tongues (60) interfere with the flanges (30).
Also, each flange (30) may be provided with a pair of side shoulders (38) for delimiting the depth of insertion of the plug (10) inside the drum (50). In use, the side shoulders (38) rest on the tongues (60).
In some applications, the plug (10) may be provided with holding means for receiving and holding a bearing (20) coaxially mountable therein. The bearing (20) fits between the flanges (30) and is held by a locking ring (22) integral with the outer race of the bearing (20).
The locking ring (22) has outer tongues that lock in interfering engagement with the inner side of the flanges (30).
FIGS. 3 and 4 show an example of a counterbalancing mechanism (100) in which the present invention may be used. All the parts are mounted around the shaft (104).
Some are fixed in rotation with reference to the shaft (104) while others may rotate around it. One end of the spring (102), opposite the assembly, is secured to the shaft (104) by means of a connecting element (106) provided with bolts and comprising a spring-receiving body. An idler bushing (108) bears the front end of the plug (10) on the shaft (104). The idler bushing (108) is held in place by small bosses inside the plug (10). The bearing (20) and the idler bushing (108) allow the assembly to rotate around the shaft (104). The shaft (104) is connected to a support plate (112) by a support bushing (110). The support plate (112) is usually secured to a wall or the ceiling.
As aforesaid, there are many possible embodiments for the connecting means. In another embodiment shown in FIG. 5, the connecting means comprises at least two spaced-apart flanges (40) radially projecting from the base (16). Each flange (40) is provided with a hole (42). The web (54) also comprises holes (44), each sized 218~507 and positioned with reference to the hole (42) of one corresponding flange (40) for receiving a removable fastener (44) therethrough. An example of such removable fastener (44) is a set of bolts and nuts. Other kinds of fasteners (44), including rivets, are possible.
Although preferred embodiments of the invention have been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments and that various changes and modifications may be effected therein without departing from the scope or spirit of the invention.
Claims (11)
1. A cable drum and torsion-spring plug assembly, the assembly comprising:
a plug comprising a base and a spring-receiving body coaxially projecting from the base;
a drum comprising a web and a cylindrical rim; and connecting means for coaxially and removably connecting the base of the plug into a locking engagement with the web of the drum.
a plug comprising a base and a spring-receiving body coaxially projecting from the base;
a drum comprising a web and a cylindrical rim; and connecting means for coaxially and removably connecting the base of the plug into a locking engagement with the web of the drum.
2. A cable drum and torsion-spring plug assembly according to claim 1, wherein the connecting means comprises:
two spaced-apart flanges axially projecting from a side of the base opposite the body; and means for removably locking the flanges in a central opening of the web.
two spaced-apart flanges axially projecting from a side of the base opposite the body; and means for removably locking the flanges in a central opening of the web.
3. A cable drum and torsion-spring plug assembly according to claim 2, wherein the means for removably locking the flanges comprises two substantially radial and spaced-apart tongues projecting inwardly from an edge of the central opening.
4. A cable drum and torsion-spring plug assembly according to claim 2, wherein each flange of the base is provided with a pair of side shoulders.
5. A cable drum and torsion-spring plug assembly according to claim 1, wherein the plug further comprises holding means for receiving and holding a bearing coaxially mountable therein.
6. A cable drum and torsion-spring plug assembly according to claim 1, wherein the connecting means comprises:
two spaced-apart flanges radially projecting from the base;
means for removably locking the flanges on the web.
two spaced-apart flanges radially projecting from the base;
means for removably locking the flanges on the web.
7. A cable drum and torsion-spring plug assembly according to claim 6, wherein the means for removably locking the flanges comprises removable fasteners insertable into corresponding holes made through the flanges and the web.
8. A cable drum and torsion-spring plug assembly according to claim 7, wherein the removable fasteners are sets of bolts and nuts.
9. A cable drum and torsion-spring plug assembly, the assembly comprising:
a plug comprising a base and a spring-receiving body coaxially projecting from the base;
a drum comprising a web and a cylindrical rim; and connecting means for coaxially and removably connecting the base of the plug into a locking engagement with the web of the drum, the connecting means comprising:
- four spaced-apart flanges axially projecting from a side of the base opposite the body; and - means for removably locking the flanges in a central opening of the web, the means comprising four substantially radial and spaced-apart tongues projecting inwardly from an edge of the central opening.
a plug comprising a base and a spring-receiving body coaxially projecting from the base;
a drum comprising a web and a cylindrical rim; and connecting means for coaxially and removably connecting the base of the plug into a locking engagement with the web of the drum, the connecting means comprising:
- four spaced-apart flanges axially projecting from a side of the base opposite the body; and - means for removably locking the flanges in a central opening of the web, the means comprising four substantially radial and spaced-apart tongues projecting inwardly from an edge of the central opening.
10. A cable drum and torsion-spring plug assembly according to claim 9, wherein each flange of the base is provided with a pair of side shoulders.
11. A cable drum and torsion-spring plug assembly according to claim 9, wherein the plug further comprises holding means for receiving and holding a bearing coaxially mountable therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002184507A CA2184507A1 (en) | 1996-08-29 | 1996-08-29 | Cable drum and torsion-spring plug assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002184507A CA2184507A1 (en) | 1996-08-29 | 1996-08-29 | Cable drum and torsion-spring plug assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2184507A1 true CA2184507A1 (en) | 1998-03-01 |
Family
ID=4158821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002184507A Abandoned CA2184507A1 (en) | 1996-08-29 | 1996-08-29 | Cable drum and torsion-spring plug assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2184507A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675701A (en) * | 2021-07-07 | 2021-11-19 | 神宇通信科技股份公司 | Quick joint method for testing insulation standing wave of inner conductor of coaxial cable |
-
1996
- 1996-08-29 CA CA002184507A patent/CA2184507A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675701A (en) * | 2021-07-07 | 2021-11-19 | 神宇通信科技股份公司 | Quick joint method for testing insulation standing wave of inner conductor of coaxial cable |
| CN113675701B (en) * | 2021-07-07 | 2024-01-09 | 神宇通信科技股份公司 | Quick joint method for coaxial cable inner conductor insulation standing wave test |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |