CA1208573A - Method of making a wire supported hose and a wire supported hose - Google Patents
Method of making a wire supported hose and a wire supported hoseInfo
- Publication number
- CA1208573A CA1208573A CA000425358A CA425358A CA1208573A CA 1208573 A CA1208573 A CA 1208573A CA 000425358 A CA000425358 A CA 000425358A CA 425358 A CA425358 A CA 425358A CA 1208573 A CA1208573 A CA 1208573A
- Authority
- CA
- Canada
- Prior art keywords
- wire
- inner sleeve
- hose
- reinforcing
- reinforcing element
- 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
Abstract
ABSTRACT
A wire-supported hose and the method of making it are disclosed. An inner sleeve is formed on a mandrel and a reinforcing wire laminated between two layers of rubberized fabric is wrapped about the sleeve. The hose then has an outer cover and cure tape applied and is vulcanized. The resulting wire-reinforced hose avoids wear due to friction between the reinforcing wire and the hose body without sacrificing elasticity and flexibility.
A wire-supported hose and the method of making it are disclosed. An inner sleeve is formed on a mandrel and a reinforcing wire laminated between two layers of rubberized fabric is wrapped about the sleeve. The hose then has an outer cover and cure tape applied and is vulcanized. The resulting wire-reinforced hose avoids wear due to friction between the reinforcing wire and the hose body without sacrificing elasticity and flexibility.
Description
~' . lZ~8573 , . .
BACKGROUND OF THE INVENTION
This invention relates to an improved wire supported ~j , hose, such as a vacuum hose, and to the method of making it.
,More specifically, the invention relates to a hose having a `spirally wound reinforcing wire which is laminated or encapsu-lated between layers of rubberized fabric which serve to capture the wire in the hose body and prevent failure due to the wire moving in the rubber body. Fabric buffers are necessary because the wire will not bond well to rubber.
The spiral windings of this fabric-wire l~minate do not abut or overlap, thus avoiding any loss of flexibility or elasticity in the hose due to the presence of a continuous ~ayer of fabric which is less ~lexihle and elastic than the hose bod~.
Prior to this invention wire supported hoses were ~subject to failure due to wear caused by movement of the reinforcing wire, necessary to prevent collapse of the hose under vacuum, against the rubber (or similar relatively soft material) of the hose body. Many approaches have been taksn to eliminate this wear by application o some type of wear strip on or around the wire, but these approaches have not been entirely satisfactory because the reduction in wear was gained at the loss of flexibility and elasticity of the hose.
For example, in U.S. Patent 2,722,263, a plastic tape is applied around the reinforcing wire~ However, this tape is wound in an overlapping fashion around the hose, forming a continuous layer having less elasticity and flexibility than the hose itself. Moreov~r, such a tape is not as effective as fabric in capturing and holding the wire. Another approach is shown in U.S. Patent 3,~46,202 wherein a wearstrip is wound over the reinforcing wire and is bonded in place with glue. There is no buffer provided . . , - ' ` ` lZ(~3573 between the wire and the inner sleeve of the hose, and the bonding in place of the wear strip necessarily limits the overall elasticity and flexibility of the hose to that of ' the bonded wearstrip. In the present invention, one or more rubberized fabric wearstrips are applied to completely encapsulate the wire. This wire-fabric laminate is then spirally wound onto the inner sleeve of the hose without overlapping to form a continuum. Thus, the relative inflexibility and inelasticity of the fabric wear strips do not materially 1. !
detract from the elasticity and flexibility of the finished , hose.
SUMM~RY OF THE I21VENTION
This invention consist~ of a method for making an elastic, flexible wire-reinforced vacuum hose and of the resultant hose. The invention avoids wear due to movement of the reinforcing wire and does so without sacrificing elasticity and flexibility of the hose.
other objects and advantages of the invention will be readily understood from the following detailed description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig~ 1 is a schematic view of the apparatus for practicing the method of this invention.
Fig. 2 i8 a detail view of block 20 of Pig. 1.
Fi~. 3 is a sectional view of the product of this invention at an intermediate stage of manufacture.
Fig. 4 is a sectional view of the completed product of this invention.
' Fig. 5 is a detail view of an alternate embodiment of block 20 of Fig. 1.
Fig. 6 is a detail view of a second alternate embodiment of block 20 of Fig. 1.
. lZ~3S73 DETAILED DESCRIPTION OF THE PREFERRED
: EMBODIMENT OF THE INVENTION__ _ The most ~ignificant advantage of this invention is that it provides a reinforced hose resistant to movement of the reinforcing wire but without loss of elasticity and flexibility. This advantage ? S achieved by spirally winding the reinforcing wire onto the hose while simultaneously encapsulating the wire between strips of fabric which serve to bond the wire to the rubber. Withou~ the fabric, the wire will not bond well ~o the rubber and consequently will move about and break down the adhesion between the wire and i' the hose.
A schematic representation of a machine 10 to practice this invention i8 shown in Fig. 1. An inner sleeve of polymeric material 30, such as gum rubber is formed around a mandrel 11. This sleeve may be formed by any of the well-known technique~ of extrusion, spiral winding from a relatively narrow roll of material, or flat winding from a roll of material whose width is substantially the circumference of the fini~hed product. In Fig. 1 the inner sleeve has already been placed on the mandrel.
Afker this inner sleeve ha~ been allowed to set, the reinorcing element is applied. Spools 12 and 13 hold ' relatively narrow tapes of fabric. Spool 14 holds the , i , reinforcing wire. These ~pools are mounted on carriage 15 f ., , ~I which i5 driven along tracks 16 at a speed synchronized with !l I
the turning speed of mandrel 11. Thus, the carriage moves a fixed distance down the longitudinal axis of the mandrel for each revolution of the mandrel, causing the reinforcing element to be spirally wound about the inner sleeve.
lZ~3573 As the carriage 15 advances synchronously with the revolution of mandrel 11 carrying inner sleeve 30, fabric tapes 12' and 13' and reinforcing wire 14' are drawn from their respective spools through guide block 20 and spirally wrapped around sleeve 30. Tension on tapes 12' and 13' causes them to encapsulate wire 14' as shown in Fig. 3. The combination of tapes 12' and 13' and wire 14' forms reinforcing element 31, Reinforcing element 31 is spirally wound onto inner sleeve 30 so that no two wraps abut or overlap, thus avoiding a continuous, relatively inelastic reinforcing layer in the hose.
Guide block 20 consists of three plates having aperture,s therethrough to allow for passage of the reinforcing tapes 12' and 13' and wire 14'. The upper aperture 21 has a rectangular cross section and is adapted to guide passage of tape 12'. The lower aperture 22 is identical to aperture 18 and guides tape 13'. The center aperture 23 has a circular cross section and guides reinforcing wire 14'. It is after passage through guide block 20 that tension on tapes 12' and 13' causes them to encapsulate wire 14'.
Alternate illustrative embodiments of block 20 are shown in Figs. 5 and 6. Using either of these alternate blocks results in a substantially identical end product.
However, the reinforcing laminate 50 i6 formed from a single ribbon of rubberized fabric which is curled as it passes through the block's aperture so as to encapsulate the wire 51. Tension on the ribbon through the block causes close wrapping of the ribbon about the wire with any of the three embodiments.
lZC~8573 After reinforcing element 31 is spirally wound down the length of inner sleeve 30, the ends of the wire are tied down in well-known fashion. The reinforced inner sleeve is then covered with another layer of pol~meric material 40, such as gum rubber. Cure tape is then wrapped around the hose, the assembly is vulc~nized, and the cure tape is removed. The result is a finished reinforced vacuum hose resistant to wear and with no significant loss of flexibility and ela~ticity. As shown in Fig. 4, tapes 12' ~nd 13' completely encapsulate wire 14' and bond it securely to inner sleeve 30 and outer layer 40. In actual practice, these layers are virtually indistinguishable after vulcaniza-tion, which merges the layers into one mass.
BACKGROUND OF THE INVENTION
This invention relates to an improved wire supported ~j , hose, such as a vacuum hose, and to the method of making it.
,More specifically, the invention relates to a hose having a `spirally wound reinforcing wire which is laminated or encapsu-lated between layers of rubberized fabric which serve to capture the wire in the hose body and prevent failure due to the wire moving in the rubber body. Fabric buffers are necessary because the wire will not bond well to rubber.
The spiral windings of this fabric-wire l~minate do not abut or overlap, thus avoiding any loss of flexibility or elasticity in the hose due to the presence of a continuous ~ayer of fabric which is less ~lexihle and elastic than the hose bod~.
Prior to this invention wire supported hoses were ~subject to failure due to wear caused by movement of the reinforcing wire, necessary to prevent collapse of the hose under vacuum, against the rubber (or similar relatively soft material) of the hose body. Many approaches have been taksn to eliminate this wear by application o some type of wear strip on or around the wire, but these approaches have not been entirely satisfactory because the reduction in wear was gained at the loss of flexibility and elasticity of the hose.
For example, in U.S. Patent 2,722,263, a plastic tape is applied around the reinforcing wire~ However, this tape is wound in an overlapping fashion around the hose, forming a continuous layer having less elasticity and flexibility than the hose itself. Moreov~r, such a tape is not as effective as fabric in capturing and holding the wire. Another approach is shown in U.S. Patent 3,~46,202 wherein a wearstrip is wound over the reinforcing wire and is bonded in place with glue. There is no buffer provided . . , - ' ` ` lZ(~3573 between the wire and the inner sleeve of the hose, and the bonding in place of the wear strip necessarily limits the overall elasticity and flexibility of the hose to that of ' the bonded wearstrip. In the present invention, one or more rubberized fabric wearstrips are applied to completely encapsulate the wire. This wire-fabric laminate is then spirally wound onto the inner sleeve of the hose without overlapping to form a continuum. Thus, the relative inflexibility and inelasticity of the fabric wear strips do not materially 1. !
detract from the elasticity and flexibility of the finished , hose.
SUMM~RY OF THE I21VENTION
This invention consist~ of a method for making an elastic, flexible wire-reinforced vacuum hose and of the resultant hose. The invention avoids wear due to movement of the reinforcing wire and does so without sacrificing elasticity and flexibility of the hose.
other objects and advantages of the invention will be readily understood from the following detailed description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig~ 1 is a schematic view of the apparatus for practicing the method of this invention.
Fig. 2 i8 a detail view of block 20 of Pig. 1.
Fi~. 3 is a sectional view of the product of this invention at an intermediate stage of manufacture.
Fig. 4 is a sectional view of the completed product of this invention.
' Fig. 5 is a detail view of an alternate embodiment of block 20 of Fig. 1.
Fig. 6 is a detail view of a second alternate embodiment of block 20 of Fig. 1.
. lZ~3S73 DETAILED DESCRIPTION OF THE PREFERRED
: EMBODIMENT OF THE INVENTION__ _ The most ~ignificant advantage of this invention is that it provides a reinforced hose resistant to movement of the reinforcing wire but without loss of elasticity and flexibility. This advantage ? S achieved by spirally winding the reinforcing wire onto the hose while simultaneously encapsulating the wire between strips of fabric which serve to bond the wire to the rubber. Withou~ the fabric, the wire will not bond well ~o the rubber and consequently will move about and break down the adhesion between the wire and i' the hose.
A schematic representation of a machine 10 to practice this invention i8 shown in Fig. 1. An inner sleeve of polymeric material 30, such as gum rubber is formed around a mandrel 11. This sleeve may be formed by any of the well-known technique~ of extrusion, spiral winding from a relatively narrow roll of material, or flat winding from a roll of material whose width is substantially the circumference of the fini~hed product. In Fig. 1 the inner sleeve has already been placed on the mandrel.
Afker this inner sleeve ha~ been allowed to set, the reinorcing element is applied. Spools 12 and 13 hold ' relatively narrow tapes of fabric. Spool 14 holds the , i , reinforcing wire. These ~pools are mounted on carriage 15 f ., , ~I which i5 driven along tracks 16 at a speed synchronized with !l I
the turning speed of mandrel 11. Thus, the carriage moves a fixed distance down the longitudinal axis of the mandrel for each revolution of the mandrel, causing the reinforcing element to be spirally wound about the inner sleeve.
lZ~3573 As the carriage 15 advances synchronously with the revolution of mandrel 11 carrying inner sleeve 30, fabric tapes 12' and 13' and reinforcing wire 14' are drawn from their respective spools through guide block 20 and spirally wrapped around sleeve 30. Tension on tapes 12' and 13' causes them to encapsulate wire 14' as shown in Fig. 3. The combination of tapes 12' and 13' and wire 14' forms reinforcing element 31, Reinforcing element 31 is spirally wound onto inner sleeve 30 so that no two wraps abut or overlap, thus avoiding a continuous, relatively inelastic reinforcing layer in the hose.
Guide block 20 consists of three plates having aperture,s therethrough to allow for passage of the reinforcing tapes 12' and 13' and wire 14'. The upper aperture 21 has a rectangular cross section and is adapted to guide passage of tape 12'. The lower aperture 22 is identical to aperture 18 and guides tape 13'. The center aperture 23 has a circular cross section and guides reinforcing wire 14'. It is after passage through guide block 20 that tension on tapes 12' and 13' causes them to encapsulate wire 14'.
Alternate illustrative embodiments of block 20 are shown in Figs. 5 and 6. Using either of these alternate blocks results in a substantially identical end product.
However, the reinforcing laminate 50 i6 formed from a single ribbon of rubberized fabric which is curled as it passes through the block's aperture so as to encapsulate the wire 51. Tension on the ribbon through the block causes close wrapping of the ribbon about the wire with any of the three embodiments.
lZC~8573 After reinforcing element 31 is spirally wound down the length of inner sleeve 30, the ends of the wire are tied down in well-known fashion. The reinforced inner sleeve is then covered with another layer of pol~meric material 40, such as gum rubber. Cure tape is then wrapped around the hose, the assembly is vulc~nized, and the cure tape is removed. The result is a finished reinforced vacuum hose resistant to wear and with no significant loss of flexibility and ela~ticity. As shown in Fig. 4, tapes 12' ~nd 13' completely encapsulate wire 14' and bond it securely to inner sleeve 30 and outer layer 40. In actual practice, these layers are virtually indistinguishable after vulcaniza-tion, which merges the layers into one mass.
Claims (10)
1. A method of making a reinforced wire supported hose comprising the steps of:
a. forming an inner sleeve of polymeric elastic material about a mandrel mounted in a hose making lathe;
b. spirally applying to the sleeve without overlap upon itself a reinforcing element comprising a reinforcing wire encapsulated in rubberized fabric;
c. applying a cover of polymeric material over the reinforcing element and the inner sleeve; and d. curing and vulcanizing the reinforced and covered inner sleeve.
a. forming an inner sleeve of polymeric elastic material about a mandrel mounted in a hose making lathe;
b. spirally applying to the sleeve without overlap upon itself a reinforcing element comprising a reinforcing wire encapsulated in rubberized fabric;
c. applying a cover of polymeric material over the reinforcing element and the inner sleeve; and d. curing and vulcanizing the reinforced and covered inner sleeve.
2. The method of claim 1 wherein the polymeric material is rubber.
3. The method of claim 1 wherein the reinforcing wire is encapsulated between at least two ribbons of rubberized fabric.
4. The method of claim 1 wherein the rubberized fabric and the reinforcing wire pass through a guide means and are then subjected to tension to cause the rubberized fabric to encapsulate the wire prior to being wound about the inner sleeve.
5. A method of making a reinforced wire supported hose comprising the steps of:
a. forming an inner sleeve of rubber about a mandrel mounted in a hose making lathe;
b. passing a reinforcing wire and a strip of rubberized fabric through a guide means so that the wire is encapsulated in the rubberized fabric to form a reinforcing element;
c. spirally applying to the sleeve the reinforcing element without overlap upon itself;
d. applying a rubber cover over the reinforcing element and the inner sleeve;
e. wrapping cure tape around the reinforced and covered inner sleeve;
f. vulcanizing the cure tape-wrapped inner sleeve; and g. removing the cure tape.
a. forming an inner sleeve of rubber about a mandrel mounted in a hose making lathe;
b. passing a reinforcing wire and a strip of rubberized fabric through a guide means so that the wire is encapsulated in the rubberized fabric to form a reinforcing element;
c. spirally applying to the sleeve the reinforcing element without overlap upon itself;
d. applying a rubber cover over the reinforcing element and the inner sleeve;
e. wrapping cure tape around the reinforced and covered inner sleeve;
f. vulcanizing the cure tape-wrapped inner sleeve; and g. removing the cure tape.
6. The method of claim 5 wherein the spiral application of the reinforcing element is accomplished by drawing the reinforcing element through guide means from spools mounted on a carriage which moves synchronously with the mandrel so that the carriage moves a fixed distance along the longitudinal axis of the mandrel for each revolution of the mandrel.
7. The method of claim 5 wherein the guide means comprises a block having a cylindrical aperture therethrough for passage of the reinforcing wire and two slots of rectangular cross section disposed above and below the cylindrical aperture for passage of two strips of rubberized fabric to encapsulate the reinforcing wire.
8. A reinforced wire supported hose, comprising:
a. an inner sleeve of polymeric material;
b. a reinforcing element spirally wound about the inner sleeve without abutment or overlap between successive windings;
c. the reinforcing element comprising a reinforcing wire encapsulated in rubberized fabric; and d. an outer cover of polymeric material applied over the inner sleeve and the reinforcing element and vulcanized thereto.
a. an inner sleeve of polymeric material;
b. a reinforcing element spirally wound about the inner sleeve without abutment or overlap between successive windings;
c. the reinforcing element comprising a reinforcing wire encapsulated in rubberized fabric; and d. an outer cover of polymeric material applied over the inner sleeve and the reinforcing element and vulcanized thereto.
9. The hose of claim 8 wherein the reinforcing element comprises a reinforcing wire encapsulated between at least two ribbons of rubberized fabric.
10. The hose of claim 8 wherein the polymeric material is rubber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US41696582A | 1982-09-13 | 1982-09-13 | |
| US416,965 | 1982-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1208573A true CA1208573A (en) | 1986-07-29 |
Family
ID=23652044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425358A Expired CA1208573A (en) | 1982-09-13 | 1983-04-06 | Method of making a wire supported hose and a wire supported hose |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1208573A (en) |
-
1983
- 1983-04-06 CA CA000425358A patent/CA1208573A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |