CA1062887A - Harnessing device - Google Patents
Harnessing deviceInfo
- Publication number
- CA1062887A CA1062887A CA279,308A CA279308A CA1062887A CA 1062887 A CA1062887 A CA 1062887A CA 279308 A CA279308 A CA 279308A CA 1062887 A CA1062887 A CA 1062887A
- Authority
- CA
- Canada
- Prior art keywords
- strap
- tang
- guide channel
- harnessing device
- locking
- 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 OF THE DISCLOSURE
A harnessing device formed by a locking head and an attached, apertured strap. The head contains a longitudinal guide channel for receiving the strap, after encirclement of items to be harnessed, and an internal locking tang. The latter is deflected with respect to relatively narrow auxiliary channels above and below the guide channel. The locking tang has its base secured to the base of the lower auxiliary channel and has an equilibrium position with its free end confined to said guide channel. The lower auxiliary channel receives the locking tang during the harnessing of the items while the other auxiliary channel contains a stop against which the locking tang becomes abutted in planar engagement by the reverse thrust of the harnessed items.
A harnessing device formed by a locking head and an attached, apertured strap. The head contains a longitudinal guide channel for receiving the strap, after encirclement of items to be harnessed, and an internal locking tang. The latter is deflected with respect to relatively narrow auxiliary channels above and below the guide channel. The locking tang has its base secured to the base of the lower auxiliary channel and has an equilibrium position with its free end confined to said guide channel. The lower auxiliary channel receives the locking tang during the harnessing of the items while the other auxiliary channel contains a stop against which the locking tang becomes abutted in planar engagement by the reverse thrust of the harnessed items.
Description
Background of the Invention This invention relates to the harnessing of items, and more particularly, to the secure harnessing of items to insure against their accidental release and is a divisional application of parent Application Serial No. 172,454 filed May 28th, 1973.
Harnessing devices are widely used for the bundling of objects. Such devices are typically formed by a serrated strap fitted to an apertured head containing an internal pawl that engages the serrations of the strap; or by an apertured strap fitted to buckle-like head, with a tongue that enters the apertures of the strap.
Harnessing devices with serrated straps have the disadvantage of being only as secure as their pawls. Where the items that are harnessed are heavy or are subjected to rough handling, the items often become accidentally released, for example, by failure of the pawls. Attempts have been made to strengthen serrated strap devices, but this has resulted in considerable complexity without achieving the desired end result of providing security against accidental release of the harnessed items. Similar objections apply to harnessing devices with buckle-like heads. In these devices, a tongue which enters the strap apertures rests against the head of the buckle near its opening and is deflected by the strap.
The tongue is typically a cantilever attachment to the buckle-like head, which tends to be unduly stiff in the direction of forward thrust during harnessing, and insufficient-ly stiff in the direction or reverse thrust applied by the strap because of the harnessed items. In addition the tongue is exposed to external interferences that can cause an accidental release of the harnessed items.
~ 106288~
Accordingly, it is an object of the invention to achieve a harnessing device for the secure harnessing of items.
A related object is to achieve secure harnessing of items without the need for employing a complex harness configuration.
According to the parent application, the invention claimed therein relates to a harnessing device comprising the combination of a locking head and a guide channel extending therethrough, a locking tang in the guide channel and an apertured locking strap secured at one end to the locking head and having its free end insertable into said guide channel, said locking strap being formed of a synthetic plastic material and being pre-stretched over at least a portion thereof extending from said free end to a width less than that of the guide channel, thereby to increase the length and tensile strength of the strap for a prescribed quantity of material and provide a strap of reduced mass for a prescribed tensile strength.
According to one broad aspect, the present invention relates to a harnessing device comprising the combination of:
(a) a locking head having a guide channel extending longitudinally therethrough, an upper channel communicating with the guide channel and superposed above the latter, and a lower channel communicating with the guide channel and disposed below the latter;
(b) a deflectable locking tang having its base secured to the base of the lower channel and having an equilibrium position with its free end confined to said guide channel; and (c) an apertured strap secured at one end to said head and having its free end adapted to be received in said guide channel and to be locked by engagement with said tang; whereby (d) the free end of said tang is adapted to be urged into the said lower channel to permit forward movement of said strap, and (e) the free end of said tang is adapted to be urged against a stop associated with the said upper channel to prevent reverse movement of said strap.
Brief Description of the Drawings Other aspects of the invention will become apparent after considering several illustrative embodiments taken in conjunction with the drawings which:
Figure I is a perspective view of a harnessing device in accordance with the invention, being used to harness a bundle of items;
Figure 2 is a perspective view of the head portion of the harnessing device of Figure 1 with the upper part broken away to show the internal construction of the head;
Figure 3A is a cross-sectional view of an alternative harnessing device head in accordance with the invention;
, c. _ , 1062~87 Figure 3B is a frontal view of the harnessing device head shown in cross-section in Figure 3A;
Figure 4 is a plan view of a harnessing device in accordance with the invention having an attached strap with a width exceeding that of the guide channel in the head, and Figure 5 is a cross-sectional view of~another alternative head configuration for a harnessing device in accordance with the invention.
Detailed Description Turning to the drawings, Figure 1 shows a harnessing device 10 in accordance with the invention formed by a locking head 20 with an attached strap 30. The latter is in the form of a ladder structure that extends perpendicular-ly with respect to a corresponding guide channel 21 extending longitudinally through the head 20. When a group of items 11 is to be harnessed, they are encircled by the strap 30, and a tab 31 at the free end of the strap is inserted into and through the guide channel 21. The strap 30 is drawn through the locking head 20 by applying a forward thrust to it, and an internal locking tang (not shown in Figure 1) is deflected with respect to associated auxiliary channels 22 and 23. The locking tang successively engages rungs 32 of the strap 30 until the items 11 are securely harnessed.
Reverse thrust produced on the strap 30 by the harnessed items 11 draws the locking tang against an internal stop (not shown) and prevents the items 11 from becoming unbundled. The device 10, including its head 20 and strap 30, is desirably made out of a resilient elastomeric material or a plastic material such as nylon.
The internal structure of the head 20 is shown in Figure 2. The channel 21 serves as a guide for the rails of the strap rungs 32. Extending into the guide channel 21 is a locking tang 25, which is pivotally mounted in the lower auxiliary channel 23. The latter is narrower than the guide channel 21 and receives the locking tang 25 when the strap is moved in the direction indicated by the forward thrust arrow F. The side walls of the lower channel 22 are spaced apart to receive the locking tang 25 without binding effect but are advantageously closely enough spaced to prevent any undesired lateral deflection of the locking tang.
As shown in Figure 2, the locking tang 25 is in its equilibrium position after having been deflected into the lower channel 23 by the forward motion of one of the rungs 32.
After the items 11 (Figure 1 ) have become securely bundled and the forward thrust F applied to the strap is terminated, the bundled items apply a reverse thrust by which the nearest of the rungs 32 forces the locking tang 25 into the upper channel 22 between narrow side walls of which one such wall 22w is shown in Figure 2, until the'tang 25 comes into contact with an inclined, planar stop 22s that blocks the upper channel 22.
The forward and reverse thrust movements of a representative locking tang 251 are illustrated in Figure 3A.
The tang 251 has a blunt end that is perpendicular to the direction of thrust, by contrast with the blunt end of the tang 25 in Figure 2 which is parallel to the direction of thrust. When forward thrust F-l is applied to the strap in Figure 3A, and one of the rungs 32-1 engages the locking tang 251, there is a component of thrust F-2 that is perpendicular to the tang and another component of thrust F-3 along the tang. The forward thrust F-l produces a counterwise deflection of the tang 251 into the lower channel 23, with the tang~
ultimately reaching the phantom position 25f. It is to be noted that as the downward deflection of the tang into the channel 23 increases, the perpendicular component of thrust F-2 decreases until the deflecting rung of the strap occupies the phantom position 32-2, after which the natural resiliency of the tang 251 restores it to its equilibrium position.
When the forward thrust F-l on the strap of Figure 3A is terminated, the reverse thrust R-l exerted by the bundled items 11 (Figure 1) causes the rung in the phantom position 32-3 to bear against the tang 251. Ultimately, as a result of the reverse thrust, the locking ta~g 251 occupies the phantom position 25r in abutting relationship with the inclined planar stop 22s. In this position, the reverse thrust R-l has a component R-2 that is perpendicular to the stop surface 22s and another component R-3 along the surface of the tang. In the rest or locked position of the tang 251 the compression component R-2 is maximum. In addition, as the tang 251 moves to the phantom position 25r, the lever arm decreases so that the resistance of the tang to reverse deflection increases as the deflection increases.
Thus the tang tends to resist the reverse thrust deflection applied by the items that have been harnessed. This is by contrast with conventional harnessing devices in which there is no increase in counter-deflection.
As shown by Figure 3A, the locking tang 251 is positioned within the head 20 to facilitate the forward thrust of the strap and at the same time impede reverse thrust. Thus, the counter-clockwise deflection of the locking tang into the lower auxiliary channel 23 is facilitated ~06Z887 by the position of the tang, while the clockwise deflection from equilibrium caused by reverse thrust is resisted. Figure 3A also shows that the height of the guide channel 21 near the output end exceeds the height of the channel near the locking tang 251. This promotes the feed of the strap in the guide channel.
In addition the walls 22w of the upper auxiliary channel 22 can be tapered towards the end of the head containing the inclined planar stop 22s, so that as the locking tang 251 moves upwardly into the channel 22 it becomes wedged between the walls 22w.
A frontal view of the locking head 20 of Figure 3A
in Figure 3B shows that when the locking tang 251 is in equilibrium, the guide channel is fully occupied, but the tang does not extend into the upper auxiliary channel (not visible in Figure 3B). The portion of the locking tang 251 which is pivotally mounted in the lower auxiliary channel is flanked by ramp surfaces 23r. These surfaces facilitate the entry of the rails 34-1 and 34-2 of the strap 30 into the guide channel and are of a width determined by the extent to which an inclined ramp effect is desired at the entrance of the locking head 20. It is to be noted that the strap 30 which is attached to the locking head is shown to have a neck 33 that is wider than the remainder of the strap between the rails 34-1 and 34-2. When the harnessing device is of nylon, the strap 30 is deliberately made oversized. It is then stretched, except at the neck 33, to a suitable width to permit easy entry into the guide channel of the head 20.
A plan view of a harnessing device With an oversized strap 30 is shown in Figure 4. As noted above, this kind -` 106Z887 of strap is formed when the harnessing device is fabricated of nylon and the strap is thereafter stretched to producé
the desired ladder configuration below the head shown by Figure 3B. Alternatively, the strap 30 of Figure 4 can be used without being pre-stretched when the harnessing device is fabricated of a stretchable elastomeric material. In that event, when the tab 31 is inserted into the guide channel 21, the strap becomes stretched over the items being harnessed by the forward thrust applied by the user. When the forward thrust is terminated, and the harnessed items exert a reverse thrust, there is resistance to that thrust by virtue of the action of the locking tang 25, but there is additional resistance to the reverse thrust between the tab 31 and the output of the guide channel. This increases the security of the harnessing device.
Harnessing devices are widely used for the bundling of objects. Such devices are typically formed by a serrated strap fitted to an apertured head containing an internal pawl that engages the serrations of the strap; or by an apertured strap fitted to buckle-like head, with a tongue that enters the apertures of the strap.
Harnessing devices with serrated straps have the disadvantage of being only as secure as their pawls. Where the items that are harnessed are heavy or are subjected to rough handling, the items often become accidentally released, for example, by failure of the pawls. Attempts have been made to strengthen serrated strap devices, but this has resulted in considerable complexity without achieving the desired end result of providing security against accidental release of the harnessed items. Similar objections apply to harnessing devices with buckle-like heads. In these devices, a tongue which enters the strap apertures rests against the head of the buckle near its opening and is deflected by the strap.
The tongue is typically a cantilever attachment to the buckle-like head, which tends to be unduly stiff in the direction of forward thrust during harnessing, and insufficient-ly stiff in the direction or reverse thrust applied by the strap because of the harnessed items. In addition the tongue is exposed to external interferences that can cause an accidental release of the harnessed items.
~ 106288~
Accordingly, it is an object of the invention to achieve a harnessing device for the secure harnessing of items.
A related object is to achieve secure harnessing of items without the need for employing a complex harness configuration.
According to the parent application, the invention claimed therein relates to a harnessing device comprising the combination of a locking head and a guide channel extending therethrough, a locking tang in the guide channel and an apertured locking strap secured at one end to the locking head and having its free end insertable into said guide channel, said locking strap being formed of a synthetic plastic material and being pre-stretched over at least a portion thereof extending from said free end to a width less than that of the guide channel, thereby to increase the length and tensile strength of the strap for a prescribed quantity of material and provide a strap of reduced mass for a prescribed tensile strength.
According to one broad aspect, the present invention relates to a harnessing device comprising the combination of:
(a) a locking head having a guide channel extending longitudinally therethrough, an upper channel communicating with the guide channel and superposed above the latter, and a lower channel communicating with the guide channel and disposed below the latter;
(b) a deflectable locking tang having its base secured to the base of the lower channel and having an equilibrium position with its free end confined to said guide channel; and (c) an apertured strap secured at one end to said head and having its free end adapted to be received in said guide channel and to be locked by engagement with said tang; whereby (d) the free end of said tang is adapted to be urged into the said lower channel to permit forward movement of said strap, and (e) the free end of said tang is adapted to be urged against a stop associated with the said upper channel to prevent reverse movement of said strap.
Brief Description of the Drawings Other aspects of the invention will become apparent after considering several illustrative embodiments taken in conjunction with the drawings which:
Figure I is a perspective view of a harnessing device in accordance with the invention, being used to harness a bundle of items;
Figure 2 is a perspective view of the head portion of the harnessing device of Figure 1 with the upper part broken away to show the internal construction of the head;
Figure 3A is a cross-sectional view of an alternative harnessing device head in accordance with the invention;
, c. _ , 1062~87 Figure 3B is a frontal view of the harnessing device head shown in cross-section in Figure 3A;
Figure 4 is a plan view of a harnessing device in accordance with the invention having an attached strap with a width exceeding that of the guide channel in the head, and Figure 5 is a cross-sectional view of~another alternative head configuration for a harnessing device in accordance with the invention.
Detailed Description Turning to the drawings, Figure 1 shows a harnessing device 10 in accordance with the invention formed by a locking head 20 with an attached strap 30. The latter is in the form of a ladder structure that extends perpendicular-ly with respect to a corresponding guide channel 21 extending longitudinally through the head 20. When a group of items 11 is to be harnessed, they are encircled by the strap 30, and a tab 31 at the free end of the strap is inserted into and through the guide channel 21. The strap 30 is drawn through the locking head 20 by applying a forward thrust to it, and an internal locking tang (not shown in Figure 1) is deflected with respect to associated auxiliary channels 22 and 23. The locking tang successively engages rungs 32 of the strap 30 until the items 11 are securely harnessed.
Reverse thrust produced on the strap 30 by the harnessed items 11 draws the locking tang against an internal stop (not shown) and prevents the items 11 from becoming unbundled. The device 10, including its head 20 and strap 30, is desirably made out of a resilient elastomeric material or a plastic material such as nylon.
The internal structure of the head 20 is shown in Figure 2. The channel 21 serves as a guide for the rails of the strap rungs 32. Extending into the guide channel 21 is a locking tang 25, which is pivotally mounted in the lower auxiliary channel 23. The latter is narrower than the guide channel 21 and receives the locking tang 25 when the strap is moved in the direction indicated by the forward thrust arrow F. The side walls of the lower channel 22 are spaced apart to receive the locking tang 25 without binding effect but are advantageously closely enough spaced to prevent any undesired lateral deflection of the locking tang.
As shown in Figure 2, the locking tang 25 is in its equilibrium position after having been deflected into the lower channel 23 by the forward motion of one of the rungs 32.
After the items 11 (Figure 1 ) have become securely bundled and the forward thrust F applied to the strap is terminated, the bundled items apply a reverse thrust by which the nearest of the rungs 32 forces the locking tang 25 into the upper channel 22 between narrow side walls of which one such wall 22w is shown in Figure 2, until the'tang 25 comes into contact with an inclined, planar stop 22s that blocks the upper channel 22.
The forward and reverse thrust movements of a representative locking tang 251 are illustrated in Figure 3A.
The tang 251 has a blunt end that is perpendicular to the direction of thrust, by contrast with the blunt end of the tang 25 in Figure 2 which is parallel to the direction of thrust. When forward thrust F-l is applied to the strap in Figure 3A, and one of the rungs 32-1 engages the locking tang 251, there is a component of thrust F-2 that is perpendicular to the tang and another component of thrust F-3 along the tang. The forward thrust F-l produces a counterwise deflection of the tang 251 into the lower channel 23, with the tang~
ultimately reaching the phantom position 25f. It is to be noted that as the downward deflection of the tang into the channel 23 increases, the perpendicular component of thrust F-2 decreases until the deflecting rung of the strap occupies the phantom position 32-2, after which the natural resiliency of the tang 251 restores it to its equilibrium position.
When the forward thrust F-l on the strap of Figure 3A is terminated, the reverse thrust R-l exerted by the bundled items 11 (Figure 1) causes the rung in the phantom position 32-3 to bear against the tang 251. Ultimately, as a result of the reverse thrust, the locking ta~g 251 occupies the phantom position 25r in abutting relationship with the inclined planar stop 22s. In this position, the reverse thrust R-l has a component R-2 that is perpendicular to the stop surface 22s and another component R-3 along the surface of the tang. In the rest or locked position of the tang 251 the compression component R-2 is maximum. In addition, as the tang 251 moves to the phantom position 25r, the lever arm decreases so that the resistance of the tang to reverse deflection increases as the deflection increases.
Thus the tang tends to resist the reverse thrust deflection applied by the items that have been harnessed. This is by contrast with conventional harnessing devices in which there is no increase in counter-deflection.
As shown by Figure 3A, the locking tang 251 is positioned within the head 20 to facilitate the forward thrust of the strap and at the same time impede reverse thrust. Thus, the counter-clockwise deflection of the locking tang into the lower auxiliary channel 23 is facilitated ~06Z887 by the position of the tang, while the clockwise deflection from equilibrium caused by reverse thrust is resisted. Figure 3A also shows that the height of the guide channel 21 near the output end exceeds the height of the channel near the locking tang 251. This promotes the feed of the strap in the guide channel.
In addition the walls 22w of the upper auxiliary channel 22 can be tapered towards the end of the head containing the inclined planar stop 22s, so that as the locking tang 251 moves upwardly into the channel 22 it becomes wedged between the walls 22w.
A frontal view of the locking head 20 of Figure 3A
in Figure 3B shows that when the locking tang 251 is in equilibrium, the guide channel is fully occupied, but the tang does not extend into the upper auxiliary channel (not visible in Figure 3B). The portion of the locking tang 251 which is pivotally mounted in the lower auxiliary channel is flanked by ramp surfaces 23r. These surfaces facilitate the entry of the rails 34-1 and 34-2 of the strap 30 into the guide channel and are of a width determined by the extent to which an inclined ramp effect is desired at the entrance of the locking head 20. It is to be noted that the strap 30 which is attached to the locking head is shown to have a neck 33 that is wider than the remainder of the strap between the rails 34-1 and 34-2. When the harnessing device is of nylon, the strap 30 is deliberately made oversized. It is then stretched, except at the neck 33, to a suitable width to permit easy entry into the guide channel of the head 20.
A plan view of a harnessing device With an oversized strap 30 is shown in Figure 4. As noted above, this kind -` 106Z887 of strap is formed when the harnessing device is fabricated of nylon and the strap is thereafter stretched to producé
the desired ladder configuration below the head shown by Figure 3B. Alternatively, the strap 30 of Figure 4 can be used without being pre-stretched when the harnessing device is fabricated of a stretchable elastomeric material. In that event, when the tab 31 is inserted into the guide channel 21, the strap becomes stretched over the items being harnessed by the forward thrust applied by the user. When the forward thrust is terminated, and the harnessed items exert a reverse thrust, there is resistance to that thrust by virtue of the action of the locking tang 25, but there is additional resistance to the reverse thrust between the tab 31 and the output of the guide channel. This increases the security of the harnessing device.
Claims (14)
1. A harnessing device comprising the combination of:
(a) a locking head having a guide channel extending longitudinally therethrough; an upper channel communicating with the guide channel and superposed above the latter, and a lower channel communicating with the guide channel and disposed below the latter;
(b) a deflectable locking tang having its base secured to the base of the lower channel having an equilibrium position with its free end confined to said guide channel; and (c) an apertured strap secured at one end to said head and having its free end adapted to be received in said guide channel and to be locked by engagement with said tang; whereby (d) the free end of said tang is adapted to be urged into the said lower channel to permit forward movement of said strap, and (e) the free end of said tang is adapted to be urged against a stop associated with the said upper channel to prevent reverse movement of said strap.
(a) a locking head having a guide channel extending longitudinally therethrough; an upper channel communicating with the guide channel and superposed above the latter, and a lower channel communicating with the guide channel and disposed below the latter;
(b) a deflectable locking tang having its base secured to the base of the lower channel having an equilibrium position with its free end confined to said guide channel; and (c) an apertured strap secured at one end to said head and having its free end adapted to be received in said guide channel and to be locked by engagement with said tang; whereby (d) the free end of said tang is adapted to be urged into the said lower channel to permit forward movement of said strap, and (e) the free end of said tang is adapted to be urged against a stop associated with the said upper channel to prevent reverse movement of said strap.
2. The harnessing device of Claim 1 wherein said locking tang is contiguous and integral with said locking strap.
3. The harnessing device of Claim 1 wherein said strap is formed integral with said locking head.
4. The harnessing device of Claim 1 wherein the free end of said locking tang is received in said upper channel which is narrower than said guide channel during the application of reverse thrust thereto.
5. The harnessing device of Claim 1 wherein said lower channel is narrower than said guide channel.
6. The harnessing device of Claim 1 wherein the walls of said guide channel converge toward one end of said head.
7. The harnessing device of Claim 1 wherein said strap is formed by a ladder structure with rungs which are spaced from one another by an interval greater than the rung cross section.
8. The harnessing device of Claim 1 wherein the strap includes rungs engaged by said locking tang which has a cross-sectional width that is substantially the same as that of said rungs.
9. The harnessing device of Claim 1 wherein said strap is formed by first and second longitudinal rails with transverse rungs connected therebetween.
10. The harnessing device of Claim 1 wherein said strap is formed by first and second longitudinal rails with transverse rungs of substantially oval cross-section connected therebetween.
11. The harnessing device of Claim 1 wherein said strap is formed by first and second longitudinal rails having transverse rungs connected therebetween, with portions of said first and second longitudinal rails permanently extended by stretching.
12. The harnessing device of Claim 1 wherein said strap is molded of nylon and is stretched after having been molded.
13. The harnessing device of Claim 1 wherein said locking tang is cantilevered at the inlet of the guide channel and has its entire length inclined with respect to the direction of extension of said guide channel.
14. The harnessing device of Claim 7 wherein said locking tang is deflectable at its root by said strap and has a linear width for engaging said transverse linear rungs.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA279,308A CA1062887A (en) | 1972-06-09 | 1977-05-27 | Harnessing device |
| CA326,388A CA1107932A (en) | 1972-06-09 | 1979-04-26 | Harnessing device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US26150672A | 1972-06-09 | 1972-06-09 | |
| CA172,454A CA1017538A (en) | 1972-06-09 | 1973-05-28 | Harnessing device |
| CA279,308A CA1062887A (en) | 1972-06-09 | 1977-05-27 | Harnessing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062887A true CA1062887A (en) | 1979-09-25 |
Family
ID=27162815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA279,308A Expired CA1062887A (en) | 1972-06-09 | 1977-05-27 | Harnessing device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1062887A (en) |
-
1977
- 1977-05-27 CA CA279,308A patent/CA1062887A/en not_active Expired
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