CA1078153A - Fixture retaining ring - Google Patents
Fixture retaining ringInfo
- Publication number
- CA1078153A CA1078153A CA306,007A CA306007A CA1078153A CA 1078153 A CA1078153 A CA 1078153A CA 306007 A CA306007 A CA 306007A CA 1078153 A CA1078153 A CA 1078153A
- Authority
- CA
- Canada
- Prior art keywords
- strip
- cylinder
- forming roll
- feed
- retaining ring
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/16—Making other particular articles rings, e.g. barrel hoops
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a retaining ring for a fixture and a method of making it. The ring is made by rolling a length of extruded stock into a coil and cutting a side of the coil to make a plurality of rings. The stock is preformed with a T-cross section so that the leg of the T can act as a retaining flange.
The invention relates to a retaining ring for a fixture and a method of making it. The ring is made by rolling a length of extruded stock into a coil and cutting a side of the coil to make a plurality of rings. The stock is preformed with a T-cross section so that the leg of the T can act as a retaining flange.
Description
~78;~
This invention relates to a method of making a retaining ring for a fixture such as an electrical ~ixture and to a machine for making such rings.
In the building construction industry certain types of electrical fixtures and related wiring control boxes are mounted in place on a ceiling with a retaining ring. These retaining rings have bracke~s that are secured to ceiling joists. The ceiliny lathe and plaster or tile is fitted to the ring following which the electrical fixture is inserted into the retaining ring. The general arrangement and use of these retaining rings is very well known.
A practical difficulty of long standing associated with the use of these retaining rings is the inconvenience and the cost of providing for the large variety of sizes in which they are required for use. Retaining rings must fit the fixtures with which they are used. Fixture sizes vary considerably and a manu-facturer will often find himself in the position of not having a ring to accommod~te a specific fixture and not wanting to involve himself with the expense of tooling up to make one becau~e hQ iS
not assured of a reasonable demand.
Retaining rings in the past have been made from cast metal. Each size requires special moulds. The cost of making these moulds and the cost of maintaining a stock of the product of the mould to be a reliable supplier of these products is ~ery substantial; so substantial in fact that many smaller suppliers are not able to maintain a good service in this product.
~ ith this invention it is possible to manufacture re-taining rings without costly dies from a single piece of stock.
The single stocX item can be speedily manufactured into rings of any size as required for use. A special machine of ~imple design is used.
. .:
:1~78~53 Thus, with the invention the problems of building a large number of special moulds and of stocking a large number of moulded parts are overcome.
It is an object of the inven~ion to provide a method and machine for making a retaining ring for electrical fixtures to size as required from a single stock item.
A method of making a retaining ring for a fixture according to this invention comprises the s~eps of taking a strip of yieldable stock with a T-cross section; rolling said strip into a spiral coil with the leg of said T-cross section extending out-wardly of the coil; cutting a wall of said coil to traverse the strip at each complete turn of said spiral coil to form said coil into a plurality of rings; and pressing the rings so formed to cause the cross-section of the stock from which they are formed to abut at it~ free ends.
A machine for making a retaining ring according to the invention comprises a base; a first feed roll adapted to engage with the outer face of a strip of yieldable material; a second feed roll adapted to engage with the inner face of a strip of yieldable material at a point spaced from the point of engagement of the first feed roll in the direction of feed; a forming rol-adapted to engage with the outer face of a strip of yieldable material at a point spaced from the point of engagement of the second feed roll in the direction of feed; and means for maintain- ~ ;
ing the forming roll against the outer surface of a strip of material as it i5 fed through said feed rolls to bend said s~rip to a constant radius and into a spiral configura~ion; said first feed roll and said fonming roll each having a continuous channel on their rolling surfaces to accommodate a flange on ~he outer face of a strip of yieldable material fed therethrough.
~g:i7~;3 The invention will be clearly understood after reference to the following detailed specification read in conjunction with the drawings.
In the drawings:
Figure 1 is a perspective illustra~cion of a machine for forming a strip of aluminum or the like into a spiral configura-tion from which retaining rings can be made.
Figures 2 and 3 are partial views of the machine of Figure 1 showing different stages in the formation of the spiral configuration.
Figure 4 is a plan view illustrating the feed and form-in~ rollers of the machine.
Figure 5 is a view similar to Figure 4 but illustrating the machine making a spiral configuration of smaller diameter.
Figure 6 is an illustration of the drive mechanism for -the machine.
Figure 7 is an illustration of a spiral configuration and showing the manner in which it is cut to form a series of rings.
Figure 8 is an illustration of a ring as it is cut from the spiral configuration.
Figure 9 is a view of a ring with the ends of the circle from the spiral configuration in abutting relation.
Figure 10 is an illustration showing the manner of use of a mounting ring.
Figure 11 is a view showing a control box bracket mounted on the ring.
Referring to the drawings and at first to Figures 8 to 10. As will be explained later in detail the mounting ring of thi~ invention is made from a strip of extruaed aluminum. The aluminum strip is made into a spiral configuration as illustrated ~.
IL~3~
in Fi~ur~ 8 following which the free ends of the strip are caused ~o abut each other as illus~rated in Figure 9 to fo~m a ring, generally designated by numeral 11. The ring has a back face 10 and a front face 12 from which a locating flange 14 extends.
In use, brackets 15 are mounted on the locating flange 14 for the purpose of supporting the ring between parallel spaced apart joist members 18 in the ceiling of a building. The ceiling lath and plaster ~0 and 22 or their equivalent are butted to the ring underneath the locating flange 14 as illustrated in Figure 10. An electrical fixture such as the fixture 24 is then inserted into the ring and is held in place by means of the resilience of spring member 26. Usually, the fixture 24 has a control box 25 which, like the brackets 16, is mounted on the locating flange 14 by means of a braoket 27 which bridges and joins the ends of the strip ~t th~ locating flange. Other forms of bridging member can be used. -The general use of retaining rings of ths type is well known and not referred to in detail in this specification. It is thought that the referenee to the use that is illustrated is sufficient. They can be used in other bu~ analogous ways.
This invention is concerned with the manner of making the ring and the machine for making it. The ring 11 which mounts the brackets 16 and the electrical control boxes in use has, ~ -prior to this invention, been made of cast metal. As indicated in the preamble to the specification, the difficulty from a cost and stocking point of view has been the large varie~y of sizes required in practice. With this invention these rings are made from extruded al~minum or the like. A variety of sizes can be made from one extrusion and the only stock that a supplier need main~ain is a stock of aluminum extrusion from which the rings can be formed to size as required~ A supplier would not roll a i-large number of rings for stock purposes unless these rings were 1~77BlS3 very popular ones and he had confidence that he would be able to use them within a relatively short period of time.
The rings are formed from a straight piece of extruded al~minum stock 28 on a forming machine generally indicated by the numeral 30. The forming machine has a base 32 upon which is mounted a feed roll 34, a feed roll 36 and a forming roll 38.
Feed rolls 34 and 36 are each rotatably mounted with respect to the base 32 and are driven by means of a drive mechanism located underneath the hase and schematically illustxated in Figure 6.
Forming roll 38 is rotatably mounted within a head 40 that is slidably mounted between ~paced apart tracks 42.
Head 40 is mounted on the ~ree end of a piston rod 44 that extends fro~ a piston that reciprocates within the cylinder 46 under the action of air pump 48. The numeral 50 refers to a pair of nuts that can be threaded to assume various locations on the piston rod 44 and which, in use, limit the travel of the piston towards the left as they engage the fac~ of the wall 52.
In use, one operates the hand pump 48 to pressurize the cylinder 46 and force the piston, its piston rod 44, head 40 and its forming roll 38 to the right and to an extent limited by the engagement of the nuts 50 with the wall 52. The extent of the travel of the head and its forming roll 38 to the right determines the diameter of ~he spiral configuration that i5 formed from the strip of material 28 as will be described more fully later.
The drive mechanism for the feeddrolls is illustrated -in ~igure 6 wherein the shafts upon which the feed rolls 34 and 36 are mounted are referred to by the numerals 54 and 56 respectively.
Numeral 58 refers to an electric drive motor. It drives sprocket 60 through speed reducing gear box 62~ The sprocket 64 is rigidly mounted on shaft 54 and is driven by sprocket 60 through chain drive 66. Gears 68 and 70 are ; ~-~7~ i3 rigidly mounted on shafts 54 and 56 respectively whereby upon driving of the shaft 54 through sprocket 64, shaft 56 is also driven at the same speed as shaft 54. As noted above, feed rolls 34 and 36 are mounted on shafts 54 and 56 respectively and are thereby driven.
Motor 5~ is a two horsepower motor with an output spe~d of 1750 rpm. Reducing gear box 62 reduces the speed to about 1/60 so tha~ the drive wheals rota~e at about 29.16 rpm In an ~mbodiment of the machine that has been built and is operating driven wheels 34 and 36 have an outside diameter of 5 inche3 and ~;
forming roll 38 has an outside diameter of 4.1/2 inches. Shafts 54 and 56 of the drive rolls 34 and 36 are spaced apart 5 3/8 inches.
The strip of material 28 from which the rings are fo~med has a locating flange 14 extending from its outer surface ~ -~
and drive roll 34 is formed with a groove on its rolling edge to ~ ~.
accommodate the rim 14. Drive roll 36 is fo~med with a knurled rolling surface to give bettex traction with respect to the strip of material 28 that is carried therethrough~ :;
In use, cylinder 46 is first evacuated by ~pening a relief valve so that the head 40 can be slid to the left within its guides 40 and 42 as the piston in the cylinder moves to the ::
left. A length of aluminum stock from which the rings are to be formed is then ~nserted between the drive rolls 34 and 36 so that the free end that extends ~hrough the rolls i~ aligned with the axis of the piston rod 44. Cylinder 46 is then-.pressurized by means of ~he hand operated pump 48 to force the piston of the :
cylinder to the righ~ as viewed in Figure 1 and carry the head 40 ~:
into contact with the free end of the strip of material 28 as illustrated in Figure 1. As.it is moved to the right, it bends ~ 3 the free end of the strip as indicated in Figure 1. The movement of the head 40 to the right is limited by engagement of the nuts 50 on the face o~ the rigidly mounted plate 52.
When the head has been moved to its extreme right posi-tion as limited by the location of the locatin~ nuts 50, the motor is operated to turn the drive roll~ 34 and 36 whereby to feed the strip of material 28 through the drive rolls. As they pass through the drive rolls pre~sure is exer~d against the s~rip by the forming r~ll 38 whereby to form the strip into a spiral formation as illustrated in Figure 2. As the free end of t.he strip completes its first circle, it engages with the upwardly sloping surface of guide plat~ 72 so that as it conkinues in its circular movement, it does so in a spiral formation with the bottom edge of one turn overlying the top edge of the next lower turn. -The result is that the length of aluminum molding 28 is formed into a spiral formation as illu~trated in Figure 7.
This spiral formation is formed into individual rings by cutting a wall of the spiral coil along a line 74 that extends across a wall of the spiral coil to traverse the strip at eash complete ~ :
turn of the spiral coil whereby to form a ring for each complete circle of th~ coil. The rings when first cut are in the form of Figure 8. To form this ring into a circle, i~ is merely : .
necessary to press the rings to cause the cross-section of the aluminum stock from which they are formed ~o abut as illustrated in Figure 9~ :
The ring formation can be stabLlized by means of a ~ .
tieing bracket that is bolted to the flange 14 atthe location of .
the butting free ends. This bracket can conveniently be bracket 27 of a control box for the fixture such as the fix~ture 24 as illustrated in Figure 11.
~7--~ ~ 7 ~ ~ S 3 Joist mounting brackets 16 are mounted at diametrically opposed locations on ~he flange 14 for the purpose of mounting the ring to ceiling joists similar to the mounting arrangement illustrated in Figure 10.
It will be apparent that when the portions of the ring that form the spiral are in spiral formation, they are somewhat longer in circumferential extent than required for a circle of the same diameter having regard to the pitch of the spiral.
However, it is found that for an 8 to 14 inc~ ring that the excess aluminum is taken up by the width of a 1/16 inch cutting blade as the cut 74 is made.
The free end of the strip 28 is initially bent out o~
circular shape as the presser plate is first urged against it in the fashion of Figure 1. This free end is indicated at 76 on Figure 7. Further, the opposite fxee end of the strip 28 that passes th~ough the feed rolls last is off-centre. This ~-has been indicated at 78 in Figure 7. Preferably, cut 74 is between the off-centre portions 76 and 78 so that each of the complete rings that result from the cut 74 are formable into a good circle as illustrated in Figure 9.
The diameter of the ring can be adjusted by adjusting the rolling location of the presser roll 38. It will be apparent that by changing the location of ~he nut 50 along the threaded portion of the piston rod 44, the extent of travel of the forming roll 38 with respect to the feed rolls 34 and 36 can be varied.
To Yary this, varies the diameter of the spiral coil that is formed. Figure 5 illustrates the fonming roll 38 closer to the feed rolls 36 and 34 than is indicated in Figure 4 and in this position of Figure 5 a smaller ring is formed.
The base of the machine preferably has a calibrating scale 80 by which one can easily locate the nuts 50 to achieve spiral coils of pr~determined dia~eters.
... ..... .
- : -' - . . . . . , ,:
;3 The aluminum preferably has no temper and it has been found that an extruded aluminum of commercial grade 60 63 F coils very satisfactorily.
From the foregoiny, it will be apparent that with the invention, one can from a single stock o alumin~ strips similar to the strip 28 make rings of various diameters from common stock as required for use.
_ ~ _
This invention relates to a method of making a retaining ring for a fixture such as an electrical ~ixture and to a machine for making such rings.
In the building construction industry certain types of electrical fixtures and related wiring control boxes are mounted in place on a ceiling with a retaining ring. These retaining rings have bracke~s that are secured to ceiling joists. The ceiliny lathe and plaster or tile is fitted to the ring following which the electrical fixture is inserted into the retaining ring. The general arrangement and use of these retaining rings is very well known.
A practical difficulty of long standing associated with the use of these retaining rings is the inconvenience and the cost of providing for the large variety of sizes in which they are required for use. Retaining rings must fit the fixtures with which they are used. Fixture sizes vary considerably and a manu-facturer will often find himself in the position of not having a ring to accommod~te a specific fixture and not wanting to involve himself with the expense of tooling up to make one becau~e hQ iS
not assured of a reasonable demand.
Retaining rings in the past have been made from cast metal. Each size requires special moulds. The cost of making these moulds and the cost of maintaining a stock of the product of the mould to be a reliable supplier of these products is ~ery substantial; so substantial in fact that many smaller suppliers are not able to maintain a good service in this product.
~ ith this invention it is possible to manufacture re-taining rings without costly dies from a single piece of stock.
The single stocX item can be speedily manufactured into rings of any size as required for use. A special machine of ~imple design is used.
. .:
:1~78~53 Thus, with the invention the problems of building a large number of special moulds and of stocking a large number of moulded parts are overcome.
It is an object of the inven~ion to provide a method and machine for making a retaining ring for electrical fixtures to size as required from a single stock item.
A method of making a retaining ring for a fixture according to this invention comprises the s~eps of taking a strip of yieldable stock with a T-cross section; rolling said strip into a spiral coil with the leg of said T-cross section extending out-wardly of the coil; cutting a wall of said coil to traverse the strip at each complete turn of said spiral coil to form said coil into a plurality of rings; and pressing the rings so formed to cause the cross-section of the stock from which they are formed to abut at it~ free ends.
A machine for making a retaining ring according to the invention comprises a base; a first feed roll adapted to engage with the outer face of a strip of yieldable material; a second feed roll adapted to engage with the inner face of a strip of yieldable material at a point spaced from the point of engagement of the first feed roll in the direction of feed; a forming rol-adapted to engage with the outer face of a strip of yieldable material at a point spaced from the point of engagement of the second feed roll in the direction of feed; and means for maintain- ~ ;
ing the forming roll against the outer surface of a strip of material as it i5 fed through said feed rolls to bend said s~rip to a constant radius and into a spiral configura~ion; said first feed roll and said fonming roll each having a continuous channel on their rolling surfaces to accommodate a flange on ~he outer face of a strip of yieldable material fed therethrough.
~g:i7~;3 The invention will be clearly understood after reference to the following detailed specification read in conjunction with the drawings.
In the drawings:
Figure 1 is a perspective illustra~cion of a machine for forming a strip of aluminum or the like into a spiral configura-tion from which retaining rings can be made.
Figures 2 and 3 are partial views of the machine of Figure 1 showing different stages in the formation of the spiral configuration.
Figure 4 is a plan view illustrating the feed and form-in~ rollers of the machine.
Figure 5 is a view similar to Figure 4 but illustrating the machine making a spiral configuration of smaller diameter.
Figure 6 is an illustration of the drive mechanism for -the machine.
Figure 7 is an illustration of a spiral configuration and showing the manner in which it is cut to form a series of rings.
Figure 8 is an illustration of a ring as it is cut from the spiral configuration.
Figure 9 is a view of a ring with the ends of the circle from the spiral configuration in abutting relation.
Figure 10 is an illustration showing the manner of use of a mounting ring.
Figure 11 is a view showing a control box bracket mounted on the ring.
Referring to the drawings and at first to Figures 8 to 10. As will be explained later in detail the mounting ring of thi~ invention is made from a strip of extruaed aluminum. The aluminum strip is made into a spiral configuration as illustrated ~.
IL~3~
in Fi~ur~ 8 following which the free ends of the strip are caused ~o abut each other as illus~rated in Figure 9 to fo~m a ring, generally designated by numeral 11. The ring has a back face 10 and a front face 12 from which a locating flange 14 extends.
In use, brackets 15 are mounted on the locating flange 14 for the purpose of supporting the ring between parallel spaced apart joist members 18 in the ceiling of a building. The ceiling lath and plaster ~0 and 22 or their equivalent are butted to the ring underneath the locating flange 14 as illustrated in Figure 10. An electrical fixture such as the fixture 24 is then inserted into the ring and is held in place by means of the resilience of spring member 26. Usually, the fixture 24 has a control box 25 which, like the brackets 16, is mounted on the locating flange 14 by means of a braoket 27 which bridges and joins the ends of the strip ~t th~ locating flange. Other forms of bridging member can be used. -The general use of retaining rings of ths type is well known and not referred to in detail in this specification. It is thought that the referenee to the use that is illustrated is sufficient. They can be used in other bu~ analogous ways.
This invention is concerned with the manner of making the ring and the machine for making it. The ring 11 which mounts the brackets 16 and the electrical control boxes in use has, ~ -prior to this invention, been made of cast metal. As indicated in the preamble to the specification, the difficulty from a cost and stocking point of view has been the large varie~y of sizes required in practice. With this invention these rings are made from extruded al~minum or the like. A variety of sizes can be made from one extrusion and the only stock that a supplier need main~ain is a stock of aluminum extrusion from which the rings can be formed to size as required~ A supplier would not roll a i-large number of rings for stock purposes unless these rings were 1~77BlS3 very popular ones and he had confidence that he would be able to use them within a relatively short period of time.
The rings are formed from a straight piece of extruded al~minum stock 28 on a forming machine generally indicated by the numeral 30. The forming machine has a base 32 upon which is mounted a feed roll 34, a feed roll 36 and a forming roll 38.
Feed rolls 34 and 36 are each rotatably mounted with respect to the base 32 and are driven by means of a drive mechanism located underneath the hase and schematically illustxated in Figure 6.
Forming roll 38 is rotatably mounted within a head 40 that is slidably mounted between ~paced apart tracks 42.
Head 40 is mounted on the ~ree end of a piston rod 44 that extends fro~ a piston that reciprocates within the cylinder 46 under the action of air pump 48. The numeral 50 refers to a pair of nuts that can be threaded to assume various locations on the piston rod 44 and which, in use, limit the travel of the piston towards the left as they engage the fac~ of the wall 52.
In use, one operates the hand pump 48 to pressurize the cylinder 46 and force the piston, its piston rod 44, head 40 and its forming roll 38 to the right and to an extent limited by the engagement of the nuts 50 with the wall 52. The extent of the travel of the head and its forming roll 38 to the right determines the diameter of ~he spiral configuration that i5 formed from the strip of material 28 as will be described more fully later.
The drive mechanism for the feeddrolls is illustrated -in ~igure 6 wherein the shafts upon which the feed rolls 34 and 36 are mounted are referred to by the numerals 54 and 56 respectively.
Numeral 58 refers to an electric drive motor. It drives sprocket 60 through speed reducing gear box 62~ The sprocket 64 is rigidly mounted on shaft 54 and is driven by sprocket 60 through chain drive 66. Gears 68 and 70 are ; ~-~7~ i3 rigidly mounted on shafts 54 and 56 respectively whereby upon driving of the shaft 54 through sprocket 64, shaft 56 is also driven at the same speed as shaft 54. As noted above, feed rolls 34 and 36 are mounted on shafts 54 and 56 respectively and are thereby driven.
Motor 5~ is a two horsepower motor with an output spe~d of 1750 rpm. Reducing gear box 62 reduces the speed to about 1/60 so tha~ the drive wheals rota~e at about 29.16 rpm In an ~mbodiment of the machine that has been built and is operating driven wheels 34 and 36 have an outside diameter of 5 inche3 and ~;
forming roll 38 has an outside diameter of 4.1/2 inches. Shafts 54 and 56 of the drive rolls 34 and 36 are spaced apart 5 3/8 inches.
The strip of material 28 from which the rings are fo~med has a locating flange 14 extending from its outer surface ~ -~
and drive roll 34 is formed with a groove on its rolling edge to ~ ~.
accommodate the rim 14. Drive roll 36 is fo~med with a knurled rolling surface to give bettex traction with respect to the strip of material 28 that is carried therethrough~ :;
In use, cylinder 46 is first evacuated by ~pening a relief valve so that the head 40 can be slid to the left within its guides 40 and 42 as the piston in the cylinder moves to the ::
left. A length of aluminum stock from which the rings are to be formed is then ~nserted between the drive rolls 34 and 36 so that the free end that extends ~hrough the rolls i~ aligned with the axis of the piston rod 44. Cylinder 46 is then-.pressurized by means of ~he hand operated pump 48 to force the piston of the :
cylinder to the righ~ as viewed in Figure 1 and carry the head 40 ~:
into contact with the free end of the strip of material 28 as illustrated in Figure 1. As.it is moved to the right, it bends ~ 3 the free end of the strip as indicated in Figure 1. The movement of the head 40 to the right is limited by engagement of the nuts 50 on the face o~ the rigidly mounted plate 52.
When the head has been moved to its extreme right posi-tion as limited by the location of the locatin~ nuts 50, the motor is operated to turn the drive roll~ 34 and 36 whereby to feed the strip of material 28 through the drive rolls. As they pass through the drive rolls pre~sure is exer~d against the s~rip by the forming r~ll 38 whereby to form the strip into a spiral formation as illustrated in Figure 2. As the free end of t.he strip completes its first circle, it engages with the upwardly sloping surface of guide plat~ 72 so that as it conkinues in its circular movement, it does so in a spiral formation with the bottom edge of one turn overlying the top edge of the next lower turn. -The result is that the length of aluminum molding 28 is formed into a spiral formation as illu~trated in Figure 7.
This spiral formation is formed into individual rings by cutting a wall of the spiral coil along a line 74 that extends across a wall of the spiral coil to traverse the strip at eash complete ~ :
turn of the spiral coil whereby to form a ring for each complete circle of th~ coil. The rings when first cut are in the form of Figure 8. To form this ring into a circle, i~ is merely : .
necessary to press the rings to cause the cross-section of the aluminum stock from which they are formed ~o abut as illustrated in Figure 9~ :
The ring formation can be stabLlized by means of a ~ .
tieing bracket that is bolted to the flange 14 atthe location of .
the butting free ends. This bracket can conveniently be bracket 27 of a control box for the fixture such as the fix~ture 24 as illustrated in Figure 11.
~7--~ ~ 7 ~ ~ S 3 Joist mounting brackets 16 are mounted at diametrically opposed locations on ~he flange 14 for the purpose of mounting the ring to ceiling joists similar to the mounting arrangement illustrated in Figure 10.
It will be apparent that when the portions of the ring that form the spiral are in spiral formation, they are somewhat longer in circumferential extent than required for a circle of the same diameter having regard to the pitch of the spiral.
However, it is found that for an 8 to 14 inc~ ring that the excess aluminum is taken up by the width of a 1/16 inch cutting blade as the cut 74 is made.
The free end of the strip 28 is initially bent out o~
circular shape as the presser plate is first urged against it in the fashion of Figure 1. This free end is indicated at 76 on Figure 7. Further, the opposite fxee end of the strip 28 that passes th~ough the feed rolls last is off-centre. This ~-has been indicated at 78 in Figure 7. Preferably, cut 74 is between the off-centre portions 76 and 78 so that each of the complete rings that result from the cut 74 are formable into a good circle as illustrated in Figure 9.
The diameter of the ring can be adjusted by adjusting the rolling location of the presser roll 38. It will be apparent that by changing the location of ~he nut 50 along the threaded portion of the piston rod 44, the extent of travel of the forming roll 38 with respect to the feed rolls 34 and 36 can be varied.
To Yary this, varies the diameter of the spiral coil that is formed. Figure 5 illustrates the fonming roll 38 closer to the feed rolls 36 and 34 than is indicated in Figure 4 and in this position of Figure 5 a smaller ring is formed.
The base of the machine preferably has a calibrating scale 80 by which one can easily locate the nuts 50 to achieve spiral coils of pr~determined dia~eters.
... ..... .
- : -' - . . . . . , ,:
;3 The aluminum preferably has no temper and it has been found that an extruded aluminum of commercial grade 60 63 F coils very satisfactorily.
From the foregoiny, it will be apparent that with the invention, one can from a single stock o alumin~ strips similar to the strip 28 make rings of various diameters from common stock as required for use.
_ ~ _
Claims (9)
1. A method of making a retaining ring for a fixture according to this invention comprising the steps of:
taking a strip of yieldable stock with a T-cross-section;
rolling said strip into a spiral coil with the leg of said T cross section extending outwardly of the coil;
cutting a wall of said coil to traverse the strip at each complete turn of said spiral coil to form said coil into a plurality of rings;
and pressing the rings so formed to cause the cross-section of the stock from which they are formed to abut at its free ends.
taking a strip of yieldable stock with a T-cross-section;
rolling said strip into a spiral coil with the leg of said T cross section extending outwardly of the coil;
cutting a wall of said coil to traverse the strip at each complete turn of said spiral coil to form said coil into a plurality of rings;
and pressing the rings so formed to cause the cross-section of the stock from which they are formed to abut at its free ends.
2. A method of making a retaining ring for a fixture as claimed in Claim 1 in which said strip of yieldable stock is rolled into a spiral coil as aforesaid by passing it through co-operating feed rolls, pressing a forming roll against it after it passes through the feed rolls to bend it to a constant radius and stacking it in a spiral coil configuration.
3. A method of making a retaining ring for a fixture as claimed in Claim 1 in which said strip of yieldable material is metal.
4. A method of making a retaining ring for a fixture as claimed in Claim 1 or Claim 2 or Claim 3 in which said strip of yieldable material is formed by extrusion.
5. A method of making a retaining ring for a fixture as claimed in claim 1 or Claim 2 or Claim 3 in which said wall of said coil is cut at an incline to a line through the wall that is parallel to the longitudinal axis of the spring coil.
6. A machine for making a retaining ring according to the invention comprising:
a base;
a first feed roll adapted to engage with the outer face of a strip of yieldable material;
a second feed roll adapted to engage with the inner face of a strip of yieldable material at a point spaced from the point of engagement of the first feed roll in the direction of feed;
a forming roll adapted to engage with the outer face of a strip of yieldable material at a point spaced from the point of engagement of the second feed roll in the direction of feed;
and means for maintaining the forming roll against the outer surface of a strip of material as it is fed through said feed rolls whereby to bend said strip to a constant radius and into a spiral configuration; said first feed roll and said forming roll each being adapted to accommodate a flange on the outer face of a strip of yieldable material fed therethrough.
a base;
a first feed roll adapted to engage with the outer face of a strip of yieldable material;
a second feed roll adapted to engage with the inner face of a strip of yieldable material at a point spaced from the point of engagement of the first feed roll in the direction of feed;
a forming roll adapted to engage with the outer face of a strip of yieldable material at a point spaced from the point of engagement of the second feed roll in the direction of feed;
and means for maintaining the forming roll against the outer surface of a strip of material as it is fed through said feed rolls whereby to bend said strip to a constant radius and into a spiral configuration; said first feed roll and said forming roll each being adapted to accommodate a flange on the outer face of a strip of yieldable material fed therethrough.
7. A machine for making a retaining ring according to Claim 6 having guide means for guiding the free end of a strip as it proceeds from said forming roll into said spiral formation.
8. A machine for making a retaining ring according to Claim 6 and Claim 7 in which said means for maintaining said forming roll against the outer surface of a strip comprises a cylinder;
a piston in said cylinder having a piston rod;
said forming roll being carried by said piston rod;
means for pressurizing said cylinder and for relieving pressure from said cylinder;
said piston being moveable in said cylinder when the cylinder is depressurized to carry said forming roll out of operative relation with said feed rolls;
said means for pressurizing said cylinder being operable to move said piston and its piston rod to carry said forming roll into operative relation with said feed rolls.
a piston in said cylinder having a piston rod;
said forming roll being carried by said piston rod;
means for pressurizing said cylinder and for relieving pressure from said cylinder;
said piston being moveable in said cylinder when the cylinder is depressurized to carry said forming roll out of operative relation with said feed rolls;
said means for pressurizing said cylinder being operable to move said piston and its piston rod to carry said forming roll into operative relation with said feed rolls.
9. A machine for making a retaining ring according to Claim 6 and Claim 7 in which said means for maintaining said forming roll against the outer surface of a strip comprises a cylinder;
a piston in said cylinder having a piston rod;
said forming roll being carried by said piston rod;
means for pressurizing said cylinder and for relieving pressure from said cylinder;
said piston being moveable in said cylinder when the cylinder is depressurized to carry said forming roll out of operative relation with said feed rolls;
said means for pressurizing said cylinder being operable to move said piston and its piston rod to carry said forming roll into operative relation with said feed rolls;
stop means for limiting the movement of said piston on pressurization of said cylinder at a predetermined location to determine the position of operative relationship for said forming roll and said feed roll.
a piston in said cylinder having a piston rod;
said forming roll being carried by said piston rod;
means for pressurizing said cylinder and for relieving pressure from said cylinder;
said piston being moveable in said cylinder when the cylinder is depressurized to carry said forming roll out of operative relation with said feed rolls;
said means for pressurizing said cylinder being operable to move said piston and its piston rod to carry said forming roll into operative relation with said feed rolls;
stop means for limiting the movement of said piston on pressurization of said cylinder at a predetermined location to determine the position of operative relationship for said forming roll and said feed roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA306,007A CA1078153A (en) | 1978-06-22 | 1978-06-22 | Fixture retaining ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA306,007A CA1078153A (en) | 1978-06-22 | 1978-06-22 | Fixture retaining ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1078153A true CA1078153A (en) | 1980-05-27 |
Family
ID=4111744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA306,007A Expired CA1078153A (en) | 1978-06-22 | 1978-06-22 | Fixture retaining ring |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1078153A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4598565A (en) * | 1985-02-13 | 1986-07-08 | Westinghouse Electric Corp. | Seal strip bending device for steam turbines |
| WO1996020052A1 (en) * | 1994-12-28 | 1996-07-04 | Valeo | Method for making a ring collar, particularly for a motor vehicle clutch mechanism |
| CN102728676A (en) * | 2012-07-06 | 2012-10-17 | 湖北大旗液压有限公司 | Stand-alone continuous ring-making process of engine gear ring blanks |
| WO2015188801A1 (en) * | 2014-06-13 | 2015-12-17 | Bruhnke, Ulrich | Method and arrangement for producing open or closed annular structural components made of light metal and alloys thereof, having a two- or three-dimensional structure |
| EP3141310A1 (en) * | 2015-09-10 | 2017-03-15 | Anton Kelz e. K. | Method for producing sealing rings with reformed profile |
| CN112222850A (en) * | 2020-09-23 | 2021-01-15 | 常州汉诺车圈有限公司 | Automatic fixed-length cutting forming machine |
-
1978
- 1978-06-22 CA CA306,007A patent/CA1078153A/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4598565A (en) * | 1985-02-13 | 1986-07-08 | Westinghouse Electric Corp. | Seal strip bending device for steam turbines |
| WO1996020052A1 (en) * | 1994-12-28 | 1996-07-04 | Valeo | Method for making a ring collar, particularly for a motor vehicle clutch mechanism |
| FR2728815A1 (en) * | 1994-12-28 | 1996-07-05 | Valeo | PROCESS FOR PRODUCING A CROWN, IN PARTICULAR FOR A CLUTCH MECHANISM, PARTICULARLY FOR A MOTOR VEHICLE |
| US6513219B1 (en) | 1994-12-28 | 2003-02-04 | Valeo | Method for producing a ring collar, notably for a clutch mechanism in particular for a motor vehicle |
| CN102728676A (en) * | 2012-07-06 | 2012-10-17 | 湖北大旗液压有限公司 | Stand-alone continuous ring-making process of engine gear ring blanks |
| WO2015188801A1 (en) * | 2014-06-13 | 2015-12-17 | Bruhnke, Ulrich | Method and arrangement for producing open or closed annular structural components made of light metal and alloys thereof, having a two- or three-dimensional structure |
| US10589330B2 (en) | 2014-06-13 | 2020-03-17 | Ulrich Bruhnke | Method and system for producing open or closed annular structural components made of light metal and alloys thereof |
| EP3141310A1 (en) * | 2015-09-10 | 2017-03-15 | Anton Kelz e. K. | Method for producing sealing rings with reformed profile |
| CN112222850A (en) * | 2020-09-23 | 2021-01-15 | 常州汉诺车圈有限公司 | Automatic fixed-length cutting forming machine |
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