CA1241982A - Spring return for tarpaulin - Google Patents
Spring return for tarpaulinInfo
- Publication number
- CA1241982A CA1241982A CA000445081A CA445081A CA1241982A CA 1241982 A CA1241982 A CA 1241982A CA 000445081 A CA000445081 A CA 000445081A CA 445081 A CA445081 A CA 445081A CA 1241982 A CA1241982 A CA 1241982A
- Authority
- CA
- Canada
- Prior art keywords
- spring
- cover
- casing
- roller pipe
- helical spring
- 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
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J7/00—Non-fixed roofs; Roofs with movable panels, e.g. rotary sunroofs
- B60J7/08—Non-fixed roofs; Roofs with movable panels, e.g. rotary sunroofs of non-sliding type, i.e. movable or removable roofs or panels, e.g. let-down tops or roofs capable of being easily detached or of assuming a collapsed or inoperative position
- B60J7/10—Non-fixed roofs; Roofs with movable panels, e.g. rotary sunroofs of non-sliding type, i.e. movable or removable roofs or panels, e.g. let-down tops or roofs capable of being easily detached or of assuming a collapsed or inoperative position readily detachable, e.g. tarpaulins with frames, or fastenings for tarpaulins
- B60J7/102—Readily detachable tarpaulins, e.g. for utility vehicles; Frames therefor
- B60J7/104—Fastening means for tarpaulins
Abstract
\
ABSTRACT OF THE DISCLOSURE
A spring return for a cover includes a casing for insertion into the open end of a conventional roller pipe, a normally extended helical spring mounted in the casing and a cord with one end being attached to a bushing in the end of the spring and then extending through the spring and out an opening in the other end of the casing and the open end of the roller pipe to a fixed point on the closed side of the opening, so that rolling of the cover onto the roller pipe tensions the spring and, when the cover is released, the spring pulls the roller and cover to the closed position. The normally extended helical spring can be replaced with a normally compressed helical spring with one end attached to the casing, so that rolling of the cover causes expansion, i.e. tensioning of the spring.
ABSTRACT OF THE DISCLOSURE
A spring return for a cover includes a casing for insertion into the open end of a conventional roller pipe, a normally extended helical spring mounted in the casing and a cord with one end being attached to a bushing in the end of the spring and then extending through the spring and out an opening in the other end of the casing and the open end of the roller pipe to a fixed point on the closed side of the opening, so that rolling of the cover onto the roller pipe tensions the spring and, when the cover is released, the spring pulls the roller and cover to the closed position. The normally extended helical spring can be replaced with a normally compressed helical spring with one end attached to the casing, so that rolling of the cover causes expansion, i.e. tensioning of the spring.
Description
This invention relates to a return device for a cover being unrolled up an incline, and in particular to a spring return device for a cover being unrolled up an incline.
Spring actuated cover returns for truck covers are well known.
Examples of such returns are disclosed in U.S. Patent Numbers 3,515,428 issued to D. C. Killion on 2 June 1970 and 4,380,350 issued to Gordon Block on 19 April 1983. Many of the patented spring return devices are unnecessarily complicated and all of the devices rely on torsional forces of helical springs i.e., the reactive torque exerted by helical springs when they are twisted around their longitudinal axes.
Problems have been experienced with most of the return systems currently in use. The object of the present invention is to overcome such problems by providing a relatively simple return device for unroll-ing a cover up an incline.
Accordingly, the present invention relates to a cover return device comprlsing tubular casing means for installation in a cover roller, helical spring means mounted in said casing means, and cord means for connecting said spring means to a fixed position, whereby rolling of the cover onto the cover roller results in a change of length of said spring means and a consequent increase in the tension exerted by said spring means on sald cover roller so that releasing of the cover causes unroll-ing of the cover from the cover roller.
The invention will now be described in greater detail with refer-ence to the accompanying drawing, which illustrates preferred embodiments of the invention and wherein:
Figure 1 is a perspective view of one corner of a typical assembly incorporating a return device in accordance with the present invention;
Figure 2 is a longitudinal sectional view of the device of Figure 5;
Figure 3 is an end view of the device of Figure 4;
Figure 4 is a longitudinal sectional view of a second embodiment of the cover return device of the present invention;
Figure 5 is a schematic side elevation view of a cover return device in accordance with the present invention; and Figure 6 is a longitudinal sectional view of one end of the device of Figure 2 on a larger scale.
With reference to Figure 1 the cover return device of the present invention is shown in use on a conventional truck body 1, which is equipped with a wind deflector 2 and a latch plate 3 mounted on the closed side top ledge 4 of the truck body 1. The wind deflector 2 includes a vertical side wall 5 and an inclined horizontal ledge 6 for carrying a roll 7 of material on a roller pipe 8.
The above mentioned components are all parts of existing cover assemblies. The device of the present invention is installed in such a system by removing the end of the roller pipe 8. The device of the present invention includes a tubular casing 10 closed at each end by flat washers 11 and 12. A normally extended helical spring 22 is mounted in the casing 10. A bushing 23, which is slidable in the casing 10, is inserted into the inner end 24 of the spring 22. The cord 18 extends from the latch plate 3 through a plug 20 and into the roller pipe 8 and the casing 10 through the spring 22 and the bushing 23. A knot 25 on the inner end of the cord 18 ensures that the bushing 23 is retained in the spring 22 and that the cord 18 is retained in the spring 22.
In the following description of the second embodiment of the invention the same references have been used wherever possible.
In the second embodiment of the invention (Figures 3 and 4) the normally extended helical spring 22 is replaced with a normally compressed helical spring 13. A bolt 14 and nut 15 are used to connect one end 16 of the spring 13 to the casing 10. Cord 18 is connected to the other end 19 of the spring 13 and extends outwardly through a plug 20 in the outer end of the roller pipe 8. The outer end of the cord 18 is secured to the latch plate 3.
The cover 7, roller pipe 8 and return device, are normally retained in the closed position under the latch plate 3. In use, the cover 7 and the roller pipe 8 are moved onto the inclined horizontal ledge 6 and the cover 7 ls rolled over the opening on top of the truck body 1. During rolling of the cover 7 the roller pipe 8 moves away from the latch plate 3 to tension the spring 22 or 13. ~Jhen the cover 7 is released the spring 13 or 22 pulls the roller pipe 8 back up the incline to the closed position i.e., causes the cover 7 to be unrolled from the pipe 8.
Thus a relatively simple yet effective cover return device has been described.
Spring actuated cover returns for truck covers are well known.
Examples of such returns are disclosed in U.S. Patent Numbers 3,515,428 issued to D. C. Killion on 2 June 1970 and 4,380,350 issued to Gordon Block on 19 April 1983. Many of the patented spring return devices are unnecessarily complicated and all of the devices rely on torsional forces of helical springs i.e., the reactive torque exerted by helical springs when they are twisted around their longitudinal axes.
Problems have been experienced with most of the return systems currently in use. The object of the present invention is to overcome such problems by providing a relatively simple return device for unroll-ing a cover up an incline.
Accordingly, the present invention relates to a cover return device comprlsing tubular casing means for installation in a cover roller, helical spring means mounted in said casing means, and cord means for connecting said spring means to a fixed position, whereby rolling of the cover onto the cover roller results in a change of length of said spring means and a consequent increase in the tension exerted by said spring means on sald cover roller so that releasing of the cover causes unroll-ing of the cover from the cover roller.
The invention will now be described in greater detail with refer-ence to the accompanying drawing, which illustrates preferred embodiments of the invention and wherein:
Figure 1 is a perspective view of one corner of a typical assembly incorporating a return device in accordance with the present invention;
Figure 2 is a longitudinal sectional view of the device of Figure 5;
Figure 3 is an end view of the device of Figure 4;
Figure 4 is a longitudinal sectional view of a second embodiment of the cover return device of the present invention;
Figure 5 is a schematic side elevation view of a cover return device in accordance with the present invention; and Figure 6 is a longitudinal sectional view of one end of the device of Figure 2 on a larger scale.
With reference to Figure 1 the cover return device of the present invention is shown in use on a conventional truck body 1, which is equipped with a wind deflector 2 and a latch plate 3 mounted on the closed side top ledge 4 of the truck body 1. The wind deflector 2 includes a vertical side wall 5 and an inclined horizontal ledge 6 for carrying a roll 7 of material on a roller pipe 8.
The above mentioned components are all parts of existing cover assemblies. The device of the present invention is installed in such a system by removing the end of the roller pipe 8. The device of the present invention includes a tubular casing 10 closed at each end by flat washers 11 and 12. A normally extended helical spring 22 is mounted in the casing 10. A bushing 23, which is slidable in the casing 10, is inserted into the inner end 24 of the spring 22. The cord 18 extends from the latch plate 3 through a plug 20 and into the roller pipe 8 and the casing 10 through the spring 22 and the bushing 23. A knot 25 on the inner end of the cord 18 ensures that the bushing 23 is retained in the spring 22 and that the cord 18 is retained in the spring 22.
In the following description of the second embodiment of the invention the same references have been used wherever possible.
In the second embodiment of the invention (Figures 3 and 4) the normally extended helical spring 22 is replaced with a normally compressed helical spring 13. A bolt 14 and nut 15 are used to connect one end 16 of the spring 13 to the casing 10. Cord 18 is connected to the other end 19 of the spring 13 and extends outwardly through a plug 20 in the outer end of the roller pipe 8. The outer end of the cord 18 is secured to the latch plate 3.
The cover 7, roller pipe 8 and return device, are normally retained in the closed position under the latch plate 3. In use, the cover 7 and the roller pipe 8 are moved onto the inclined horizontal ledge 6 and the cover 7 ls rolled over the opening on top of the truck body 1. During rolling of the cover 7 the roller pipe 8 moves away from the latch plate 3 to tension the spring 22 or 13. ~Jhen the cover 7 is released the spring 13 or 22 pulls the roller pipe 8 back up the incline to the closed position i.e., causes the cover 7 to be unrolled from the pipe 8.
Thus a relatively simple yet effective cover return device has been described.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A self-contained cover return device for insertion into the open end of a conventional cover roller pipe comprising tubular casing means for installation in the cover roller pipe; helical spring means mounted in said casing means;
stop means fixedly connecting one end of said spring means in said casing means; and cord means for connecting said spring means to a fixed element outside of the casing means, whereby rolling of the cover onto the cover roller pipe results in a change in the length of said spring means and a consequent increase in the tension exerted by said spring means on said cover roller pipe so that releasing of the cover causes unrolling of the cover from the cover roller pipe.
stop means fixedly connecting one end of said spring means in said casing means; and cord means for connecting said spring means to a fixed element outside of the casing means, whereby rolling of the cover onto the cover roller pipe results in a change in the length of said spring means and a consequent increase in the tension exerted by said spring means on said cover roller pipe so that releasing of the cover causes unrolling of the cover from the cover roller pipe.
2. A cover return device according to claim 1 wherein said spring means is a normally extended helical spring, said stop means is connected to one end of said spring and is slidably mounted in said casing means, and said cord means is connected to said stop means, extending through the spring along the longitudinal axis thereof through a closed end of said casing means, whereby rolling of the cover onto the cover roller pipe results in movement of said stop means towards said closed end of the casing means to compress said normally extended spring to place the spring under tension.
3. A cover return device according to claim 1 wherein said spring means is a normally compressed helical spring, said stop means is located at one end of said casing means, one end of said cord means is connected to the other end of said helical spring, whereby rolling of the cover onto the cover roller pipe results in an elongation of said normally compressed helical spring to place the spring under tension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000445081A CA1241982A (en) | 1984-01-11 | 1984-01-11 | Spring return for tarpaulin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000445081A CA1241982A (en) | 1984-01-11 | 1984-01-11 | Spring return for tarpaulin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1241982A true CA1241982A (en) | 1988-09-13 |
Family
ID=4126919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000445081A Expired CA1241982A (en) | 1984-01-11 | 1984-01-11 | Spring return for tarpaulin |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1241982A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6513856B1 (en) | 2002-03-28 | 2003-02-04 | Shur Company | Roll assist mechanism for tarp systems |
-
1984
- 1984-01-11 CA CA000445081A patent/CA1241982A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6513856B1 (en) | 2002-03-28 | 2003-02-04 | Shur Company | Roll assist mechanism for tarp systems |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5307856A (en) | Automatically retractable awning | |
| DE60129125T2 (en) | ENERGY ABSORBER | |
| US5791090A (en) | Variable tension roofing and structural protective harness | |
| DE3231509C2 (en) | Tensioning device for a belt end of a seat belt system that can be wound onto a belt roll | |
| DE202007012982U1 (en) | Window roller blind for a vehicle window | |
| US5513469A (en) | Retractable sliding door | |
| EP0705741B1 (en) | Adjusting apparatus for a pillar loop | |
| CA1241982A (en) | Spring return for tarpaulin | |
| DE3245009A1 (en) | Roller door | |
| CA1157064A (en) | Device for mounting pneumatic spring for opening automobile hatch door | |
| DE202011109765U1 (en) | Weight-controlled wind pressure relief system | |
| EP3693531A1 (en) | Finger protection device for a door | |
| DE2619175B2 (en) | Articulated arm awning | |
| DE8022252U1 (en) | DRIVE UNIT FOR A TRANSPORT CABLE | |
| AT501436B1 (en) | WINDSENSOR FOR SUNSCREEN SYSTEM WITH COMPENSATION SYSTEM | |
| EP0499777B1 (en) | Florentine blind | |
| DE4026392C2 (en) | Buckle support for the pop-up roofs of vehicles or the like | |
| DE19925226C2 (en) | darkening system | |
| AT409515B (en) | AWNING WITH A VERTICAL PIVOTING ARM | |
| DE7900173U1 (en) | DEVICE FOR PROTECTING VEHICLES AGAINST WEATHER INFLUENCES | |
| EP1319772A1 (en) | Positive return awning with one sided length compensating device | |
| DE8024905U1 (en) | DEVICE FOR SLIDING STORAGE OF A TRACK FROM A FLEXIBLE MATERIAL | |
| DE19626582A1 (en) | Motor-vehicle with cover unrolling over load in boot | |
| DE4334519A1 (en) | Vertical awning for covering windows | |
| AT11824U1 (en) | VERTICAL AND HORIZONTAL CONTAINABLE ROLLOSYSTEM, ESPECIALLY INSECT SCREENS ROLLOSYSTEM, WITH LOW BUILDING DEPTH |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |