CA2039091A1 - Removable hoist system - Google Patents
Removable hoist systemInfo
- Publication number
- CA2039091A1 CA2039091A1 CA 2039091 CA2039091A CA2039091A1 CA 2039091 A1 CA2039091 A1 CA 2039091A1 CA 2039091 CA2039091 CA 2039091 CA 2039091 A CA2039091 A CA 2039091A CA 2039091 A1 CA2039091 A1 CA 2039091A1
- Authority
- CA
- Canada
- Prior art keywords
- post
- arm
- secured
- van
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Landscapes
- Jib Cranes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A removable hoist system for a doorway of a van which comprises, when in position, a post vertically mounted in the doorway and an arm having one end secured to the post. The arm during operation extends horizontally from the post and a lift means is secured to the other end of the arm, for lifting or lower objects with respect to the van. A lower plate is secured to the floor of the van where the post is mounted and an aperture centrally positioned in the plate, and an upper plate is secured to a frame portion of the van in the upper part of the doorway, vertically above the lower plate with an aperture centrally positioned in this upper plate. Pins removably received in the aperture of the plates to hold the post in vertical osition during operation outwardly extend from the ends of the post. The post is of a length so that when it is in position with its pins in the apertures there is sufficient clearance at the top to permit lifting of the post so that the lower pin is clear of the aperture for removal of the post. The plates have sufficient load bearing strength when secured in position in the van to withstand a predetermined weight of object when lifted or lowered by the lift means.
A removable hoist system for a doorway of a van which comprises, when in position, a post vertically mounted in the doorway and an arm having one end secured to the post. The arm during operation extends horizontally from the post and a lift means is secured to the other end of the arm, for lifting or lower objects with respect to the van. A lower plate is secured to the floor of the van where the post is mounted and an aperture centrally positioned in the plate, and an upper plate is secured to a frame portion of the van in the upper part of the doorway, vertically above the lower plate with an aperture centrally positioned in this upper plate. Pins removably received in the aperture of the plates to hold the post in vertical osition during operation outwardly extend from the ends of the post. The post is of a length so that when it is in position with its pins in the apertures there is sufficient clearance at the top to permit lifting of the post so that the lower pin is clear of the aperture for removal of the post. The plates have sufficient load bearing strength when secured in position in the van to withstand a predetermined weight of object when lifted or lowered by the lift means.
Description
B~CXGRO~ND OF ~ XNV~NTION
The present invention relates to a removable hoist system for a doorway of a light duty van.
There is presently a need for a device for lightweight vans, particularly when used for commercial purposes, which will facilitate lifting o~ heavy objects into the van from the outside, or lowering of such objects to the ground from within the van. At the present time, such objects are generally manually raised and lowered.
There has been a need for a mechanical means to assist the lifting and lowering of such heavy objects in such service vans. Truck mounted lifting cranes such as those described and illustrated for example in Coates et al U.S. Patent No. 2,862, 628 have not been suitable for adaption to service vans since they require special brackets for mounting at both top and bottom.
Permanently mounted track hoists are described and illustrated for example in Adams U.S. Patent No. ~,512,9~8 issued June 27, 1950 and Reed U.S. Patent No. 2,565,091 issued August 21, 1951. An externally mounted truck hoist is described and illustrated in U.S.
Patent No. 3,578,179 of Fujioka issued May 11, 1971. Again that construction requires special bracket~ at top and bottom making it effectively a permanently mounted structure.
It is an object of the present invention to provide a sturdy, lightweight hoist system for a light duty service van, whereby a hoist may be easily installed in and removed from th2 doorway of the van, to thereby permit easier handling of heavy 2~9~t3~, objects with respect to the van.
~31JML~RY O~ E INVI~NTION
In accordance with the present invention there is provided a removable hoist system for a doorway of a van which comprises, when in position, a post vertically mounted in the doorway and an arm having one end secured to the post. The arm during operation extends horiæontally from the post and a li~t means is secured to the other end of the arm, for lifting or lower objects with respect to the van. A lower plate is secured to the floor of the van where the post is mounted and an aperture centrally positioned in the plate, and an upper plate is secured to a frame portion of the van in the upper part of the doorway, verticall~ above the lower plate with an aperture centrally positioned in this upper plat~. Pins removably received in the aperture o~ the plates to ho]d the post in vertical osition during operation outwardly extend from the ends of the post. The post is of a length so that when it is in position with its pins in the apertures there is suf~icient clearance at the top to permit lifting of the po~t so that the lower pin is clear of the aperture ~or removal of the post. The plates have sufficient load bearing strength when secured in position in the van to withstand a predetermined weight of object when lifted or lowered by the lift means.
In a preferred embodiment, the post and arm are collapsible. In particular the arm i5 pivotally secured to the - '' ' .:
, 2 V 3 '~ 3 ~
post near its top. A brace member having two ends is pivotally secured at one end near the bottom of the post with the other end being releasably securable to the arm to support the arrn horizontally.
~he hoist system according to the present invention is simple to install and operate. The plates when mounted in the doorway of the van so as not to obstruct the closing of the van doors, require no latch pins or special brackets ~or mounting of the posts in vertical orientation or removal thereo~. To remove the hoist itself, the po5t is simply lifted to clear the lower pin from its aperture, pulled back at the bottom and lowered ko clear the upper pin from its aperture, for removal in a matter o~
seconds, without tools pins or latches. No special brackets are required at the top of the post - only a small hole must be made in the frame, in alignment with the aperture in the upper plate. No alterations at all are required in the bottom of the truck, other than to secure of the plate to the bottom.
B ~P D~æCRIP~ION OF T~E_D~AWING~
These and other ob3ects and advantages of the invention will become apparent upon reading the following detailed description and upon referring to the drawings in which:
FIGURE 1 is a perspective view o~ a light duty service van, from the rear, in which a hoist system according to the present invention has been installed.
FIGURE 2 is a side view of the hoist system of Figure 1;
, 2 ~
and FIGURE 3 is a side view of the hoist system of Figure 1 in collapsed position, illustrating the manner in which it collapses.
5While the invention will be described in conjunction with an example embodiment, it will be understood that it is not intended to limit the invention to such embodiment. On the contrary, it is intended to cover a:Ll alternatives, modifications and equivalents as may be included within the spirit and scope of 10the invention as defined by the appended claims.
DE~AILED D~8CR~PTlON OF THE INVENTION
In the drawings, similar features have been given similar reference numerals.
Turning to FIGURE 1 there is illustrated a hoist system 152 mounted on a light duty service van 1. Hoist system 2 comprises a post or mast 6, which is preferably mounted in the rear entrance doorway o~ a van so that doors 8 will not close when post 6 is in position, but will close when post 6 is removed from position, in ; a manner which will be explained in more detail hereinafter. This is designed as a safety feature.
Post 6 is provided with bottom pin 10 and top pin 12 (FIGURE 3~ for removably mounting the post with respect to the van.
In this regard, a bottom plate 14 is fastened, by bolts or other appropriate fasteners, to floor 16 in the rear doorway of the van 254 as illustrated. ~n aperture 1~ is centered within bottom plate :, ~
.
.
2~3~
14 as illustrated, for removably receiving bottom pin 10 of post 6.
Above the doorway and secured to the door frame 20 of van 4 by means of bolts or other fasteniny means is a top plate 2~. Aliyned vertically above aperture 18 and centered in plate 24 i5 an aperture 26 to removably receive top pin 12 of post 6. A
depression 2~ is drilled into frame 20, aligned with aperture 26, to receive the upper portion of top pin 12 as illustrated i.n F.iyure 1.
The positioning of plates 14 and 24 in the doorway of van 4 does not interfere with the opening and closing of doors 8.
Upper pin 12 is somewhat more elongated than bottom pin 10 and a clearance 30 is provided between the top 32 of post 6 and : top plate 24 to ensure that post 6 may be readily removed from or positioned in plates 1~ and 24, and securely held in position by these plates when installed in position as illustrated in Figure 1.
~o insert post 6 into position, top pin 12 is fully inserted in the aperture 26 of top plate 4 and depression 28 in door frame 20 This provides clearance at the bottom to enable bottom pin 10 to be moved into position and dropped into aperture 18 o~ bottom plate 14. For removal from this position, post S is elevated so that bottom pin 10 is removed from and clear o~ bottom plate 14, enabling post 6 to be swunq sideways, away from vertical orientation, until it is entirely clear of bottom plate 14 and floor 16 of the van. Top pin 12 may then be removed ~rom aperture 26 and depression 28 by downward movement of post 6.
Pivotally secured to post 6 are arm 34 and brace member 36. More particularly/ a pair of plates 38 is secured to both :
2~3~
sides of post 6 near its top, and inner end 40 of arm 34 is pivotally bolted to the plates throuyh aligned apertures in the plates 38 and inner end 40 of arm 34. Similarly the lower end 42 o~ brace member 36 is bolted between spaced plates 44 secured to a lower portion of post 6 as illustrated. As can be seen in Fiyure 3, the positioning of the pivot poiLnts oE arm 34 with respect to plates 38 and brace member 36 with respect to plates 44 is such as to permit the arm and brace member to be collapsed into orientation parallel with post 6 for storage purposes.
A pair of plates 46 are secured to either side of arm 34 in downwardly depending fashion, as illustrated in Figures 1 and 2, and provided with apertures 48 (FIGURE 3) which are aligned with aperture 50 in the free end of brace member 36 so that a pin 52 may be removably received in these apertures, when aligned, to maintain and support arm 34 in horizontal position when hoist system 2 is operational. ~hen pin 52 is removed, arm 34 and brace member 36 may be pivoted into collapsed position as illustrated in Figure 3, ~or storage. Brace member 36, in this collapsed position, is nested between plate~ 46 to provide a neat, compact arrangement for storage purposes. It is preferred that, in this collapsed position, apertures ~8 be aligned with an aperture 53 in post 6 so that placing pin 52 thro;ugh these aligned apertures will secure the arm and brace member in collapsed position parallel to post 60 Pcst 6, arm 34 and brace member 36 are preferably made of s~uare or rectangular tubular metal stock, although any other material providing light weight sturdy construction may bP used.
To free end 54 o~ arm 34 is releasably secured a chain ~ . . . ..
~3~
~ 7 block 56 as illustrated in phantom in FIGURE 1. Preferably a plate 58 is secured, to he in vertical orientation when hoist system 2 is operational, to the free end 54 of arm 34, plate 58 beiny provid~d with an aperture 60 to which chain block 56 may be hooked. Chain block 56 itself is preferably provided with a hand-operated rachet means 62, by which chain 64 may be raised or lowered, any appropriate object securing means 6~5 being provided on ch.lin 64~
As previously indicated, to install the hoist or crane provided by post 6, arm 34 and brace member 36 in posltion, post 6 is simply li~ted vertically so that top pin 12 is inserted in aperture 26 in top plate 24 and depression 28 in the van frame 20, and then, with bottom pin 10 aligned with aperture 18 in bottom plate 14, post 6 is lowered so that bottom pin 10 îs seated in aperture 18 in bottom plate 14. In this position, a portion of pin 12 remains seated in upper plate aperture 26. With both pins thus seated in the apertures of their corresponding plates, arm 34 and brace member 36 are then unfolded from storage position until the apertures 48 in plates 46 are aligned with brace member aperture 50. Pin 52 i5 inserted in these aligned apertures so that arm 34 is held in horizontal position. Chain block 56 is mounted on plate ; 58 and hoist system 2 is then operational.
The size, shape and location of plates 14 and 24 are selected so as to ensure that the hoist system 2 is securely maintained in position and can withstand a predetermined weight oE
an object when lifted or lowered by chain block 56. These plates are positioned, as well r SO that they do not obstruct the opening and closing of doors 8.
2~39 o ~r~3 1 It has been ascertained through testing that the hoist system 2 according to the present invention will lift objects of up to one-half to threa-guarters of a ton with little or no di~ficulty.
Pins 10 and 12 are preferably of circular cross-section so as to permit post 6 and arm 34 to pivot about an axis through these pins when post 6 is in operative position with respect to plates 14 and 24 (FIGURE 1).
It will be understood that no holes are re~uired in the bottom o~ the vehicle for insertion o~ the bottom pin 10, as that pin is carried entirely by bottom plate 14. As well no special brackets are required at the top. The only structural modification required for the top o~ the doorway is the small depression 28 which is formed behind aperture 26 of top plats 24 and the holes for receiving fastening means to secure top plate in position. The ~; device according to the present invention requires no special brackets or pins for removal or installation and is easy to install for use and to remove and collapse for storage.
Thus it is apparent that there has been provided in accordance with ~h~- invention an improved removable hoist system for a doorway of a van that fully satisfies the objects, aims and advantages set forth above. While the invention has been described ;~ in conjunction with specific embodiments thereo~, it is evident that many alternatives, modi~ications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the ~3~J~
g spirit and broad scope of the invention.
The present invention relates to a removable hoist system for a doorway of a light duty van.
There is presently a need for a device for lightweight vans, particularly when used for commercial purposes, which will facilitate lifting o~ heavy objects into the van from the outside, or lowering of such objects to the ground from within the van. At the present time, such objects are generally manually raised and lowered.
There has been a need for a mechanical means to assist the lifting and lowering of such heavy objects in such service vans. Truck mounted lifting cranes such as those described and illustrated for example in Coates et al U.S. Patent No. 2,862, 628 have not been suitable for adaption to service vans since they require special brackets for mounting at both top and bottom.
Permanently mounted track hoists are described and illustrated for example in Adams U.S. Patent No. ~,512,9~8 issued June 27, 1950 and Reed U.S. Patent No. 2,565,091 issued August 21, 1951. An externally mounted truck hoist is described and illustrated in U.S.
Patent No. 3,578,179 of Fujioka issued May 11, 1971. Again that construction requires special bracket~ at top and bottom making it effectively a permanently mounted structure.
It is an object of the present invention to provide a sturdy, lightweight hoist system for a light duty service van, whereby a hoist may be easily installed in and removed from th2 doorway of the van, to thereby permit easier handling of heavy 2~9~t3~, objects with respect to the van.
~31JML~RY O~ E INVI~NTION
In accordance with the present invention there is provided a removable hoist system for a doorway of a van which comprises, when in position, a post vertically mounted in the doorway and an arm having one end secured to the post. The arm during operation extends horiæontally from the post and a li~t means is secured to the other end of the arm, for lifting or lower objects with respect to the van. A lower plate is secured to the floor of the van where the post is mounted and an aperture centrally positioned in the plate, and an upper plate is secured to a frame portion of the van in the upper part of the doorway, verticall~ above the lower plate with an aperture centrally positioned in this upper plat~. Pins removably received in the aperture o~ the plates to ho]d the post in vertical osition during operation outwardly extend from the ends of the post. The post is of a length so that when it is in position with its pins in the apertures there is suf~icient clearance at the top to permit lifting of the po~t so that the lower pin is clear of the aperture ~or removal of the post. The plates have sufficient load bearing strength when secured in position in the van to withstand a predetermined weight of object when lifted or lowered by the lift means.
In a preferred embodiment, the post and arm are collapsible. In particular the arm i5 pivotally secured to the - '' ' .:
, 2 V 3 '~ 3 ~
post near its top. A brace member having two ends is pivotally secured at one end near the bottom of the post with the other end being releasably securable to the arm to support the arrn horizontally.
~he hoist system according to the present invention is simple to install and operate. The plates when mounted in the doorway of the van so as not to obstruct the closing of the van doors, require no latch pins or special brackets ~or mounting of the posts in vertical orientation or removal thereo~. To remove the hoist itself, the po5t is simply lifted to clear the lower pin from its aperture, pulled back at the bottom and lowered ko clear the upper pin from its aperture, for removal in a matter o~
seconds, without tools pins or latches. No special brackets are required at the top of the post - only a small hole must be made in the frame, in alignment with the aperture in the upper plate. No alterations at all are required in the bottom of the truck, other than to secure of the plate to the bottom.
B ~P D~æCRIP~ION OF T~E_D~AWING~
These and other ob3ects and advantages of the invention will become apparent upon reading the following detailed description and upon referring to the drawings in which:
FIGURE 1 is a perspective view o~ a light duty service van, from the rear, in which a hoist system according to the present invention has been installed.
FIGURE 2 is a side view of the hoist system of Figure 1;
, 2 ~
and FIGURE 3 is a side view of the hoist system of Figure 1 in collapsed position, illustrating the manner in which it collapses.
5While the invention will be described in conjunction with an example embodiment, it will be understood that it is not intended to limit the invention to such embodiment. On the contrary, it is intended to cover a:Ll alternatives, modifications and equivalents as may be included within the spirit and scope of 10the invention as defined by the appended claims.
DE~AILED D~8CR~PTlON OF THE INVENTION
In the drawings, similar features have been given similar reference numerals.
Turning to FIGURE 1 there is illustrated a hoist system 152 mounted on a light duty service van 1. Hoist system 2 comprises a post or mast 6, which is preferably mounted in the rear entrance doorway o~ a van so that doors 8 will not close when post 6 is in position, but will close when post 6 is removed from position, in ; a manner which will be explained in more detail hereinafter. This is designed as a safety feature.
Post 6 is provided with bottom pin 10 and top pin 12 (FIGURE 3~ for removably mounting the post with respect to the van.
In this regard, a bottom plate 14 is fastened, by bolts or other appropriate fasteners, to floor 16 in the rear doorway of the van 254 as illustrated. ~n aperture 1~ is centered within bottom plate :, ~
.
.
2~3~
14 as illustrated, for removably receiving bottom pin 10 of post 6.
Above the doorway and secured to the door frame 20 of van 4 by means of bolts or other fasteniny means is a top plate 2~. Aliyned vertically above aperture 18 and centered in plate 24 i5 an aperture 26 to removably receive top pin 12 of post 6. A
depression 2~ is drilled into frame 20, aligned with aperture 26, to receive the upper portion of top pin 12 as illustrated i.n F.iyure 1.
The positioning of plates 14 and 24 in the doorway of van 4 does not interfere with the opening and closing of doors 8.
Upper pin 12 is somewhat more elongated than bottom pin 10 and a clearance 30 is provided between the top 32 of post 6 and : top plate 24 to ensure that post 6 may be readily removed from or positioned in plates 1~ and 24, and securely held in position by these plates when installed in position as illustrated in Figure 1.
~o insert post 6 into position, top pin 12 is fully inserted in the aperture 26 of top plate 4 and depression 28 in door frame 20 This provides clearance at the bottom to enable bottom pin 10 to be moved into position and dropped into aperture 18 o~ bottom plate 14. For removal from this position, post S is elevated so that bottom pin 10 is removed from and clear o~ bottom plate 14, enabling post 6 to be swunq sideways, away from vertical orientation, until it is entirely clear of bottom plate 14 and floor 16 of the van. Top pin 12 may then be removed ~rom aperture 26 and depression 28 by downward movement of post 6.
Pivotally secured to post 6 are arm 34 and brace member 36. More particularly/ a pair of plates 38 is secured to both :
2~3~
sides of post 6 near its top, and inner end 40 of arm 34 is pivotally bolted to the plates throuyh aligned apertures in the plates 38 and inner end 40 of arm 34. Similarly the lower end 42 o~ brace member 36 is bolted between spaced plates 44 secured to a lower portion of post 6 as illustrated. As can be seen in Fiyure 3, the positioning of the pivot poiLnts oE arm 34 with respect to plates 38 and brace member 36 with respect to plates 44 is such as to permit the arm and brace member to be collapsed into orientation parallel with post 6 for storage purposes.
A pair of plates 46 are secured to either side of arm 34 in downwardly depending fashion, as illustrated in Figures 1 and 2, and provided with apertures 48 (FIGURE 3) which are aligned with aperture 50 in the free end of brace member 36 so that a pin 52 may be removably received in these apertures, when aligned, to maintain and support arm 34 in horizontal position when hoist system 2 is operational. ~hen pin 52 is removed, arm 34 and brace member 36 may be pivoted into collapsed position as illustrated in Figure 3, ~or storage. Brace member 36, in this collapsed position, is nested between plate~ 46 to provide a neat, compact arrangement for storage purposes. It is preferred that, in this collapsed position, apertures ~8 be aligned with an aperture 53 in post 6 so that placing pin 52 thro;ugh these aligned apertures will secure the arm and brace member in collapsed position parallel to post 60 Pcst 6, arm 34 and brace member 36 are preferably made of s~uare or rectangular tubular metal stock, although any other material providing light weight sturdy construction may bP used.
To free end 54 o~ arm 34 is releasably secured a chain ~ . . . ..
~3~
~ 7 block 56 as illustrated in phantom in FIGURE 1. Preferably a plate 58 is secured, to he in vertical orientation when hoist system 2 is operational, to the free end 54 of arm 34, plate 58 beiny provid~d with an aperture 60 to which chain block 56 may be hooked. Chain block 56 itself is preferably provided with a hand-operated rachet means 62, by which chain 64 may be raised or lowered, any appropriate object securing means 6~5 being provided on ch.lin 64~
As previously indicated, to install the hoist or crane provided by post 6, arm 34 and brace member 36 in posltion, post 6 is simply li~ted vertically so that top pin 12 is inserted in aperture 26 in top plate 24 and depression 28 in the van frame 20, and then, with bottom pin 10 aligned with aperture 18 in bottom plate 14, post 6 is lowered so that bottom pin 10 îs seated in aperture 18 in bottom plate 14. In this position, a portion of pin 12 remains seated in upper plate aperture 26. With both pins thus seated in the apertures of their corresponding plates, arm 34 and brace member 36 are then unfolded from storage position until the apertures 48 in plates 46 are aligned with brace member aperture 50. Pin 52 i5 inserted in these aligned apertures so that arm 34 is held in horizontal position. Chain block 56 is mounted on plate ; 58 and hoist system 2 is then operational.
The size, shape and location of plates 14 and 24 are selected so as to ensure that the hoist system 2 is securely maintained in position and can withstand a predetermined weight oE
an object when lifted or lowered by chain block 56. These plates are positioned, as well r SO that they do not obstruct the opening and closing of doors 8.
2~39 o ~r~3 1 It has been ascertained through testing that the hoist system 2 according to the present invention will lift objects of up to one-half to threa-guarters of a ton with little or no di~ficulty.
Pins 10 and 12 are preferably of circular cross-section so as to permit post 6 and arm 34 to pivot about an axis through these pins when post 6 is in operative position with respect to plates 14 and 24 (FIGURE 1).
It will be understood that no holes are re~uired in the bottom o~ the vehicle for insertion o~ the bottom pin 10, as that pin is carried entirely by bottom plate 14. As well no special brackets are required at the top. The only structural modification required for the top o~ the doorway is the small depression 28 which is formed behind aperture 26 of top plats 24 and the holes for receiving fastening means to secure top plate in position. The ~; device according to the present invention requires no special brackets or pins for removal or installation and is easy to install for use and to remove and collapse for storage.
Thus it is apparent that there has been provided in accordance with ~h~- invention an improved removable hoist system for a doorway of a van that fully satisfies the objects, aims and advantages set forth above. While the invention has been described ;~ in conjunction with specific embodiments thereo~, it is evident that many alternatives, modi~ications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the ~3~J~
g spirit and broad scope of the invention.
Claims (6)
1. A removable hoist system for a doorway of a van comprising, when in position, a post vertically mounted in the doorway, an arm having one end secured to the post, the arm during operation extending horizontally from the post, and a lift means secured to the other end of the arm for lifting or lowering an object with respect to the van, a lower plate secured to the floor of the van where the post is mounted, and an aperture centrally positioned in the plate, an upper plate secured to a frame portion of the van in the upper part of the doorway, vertically above the lower plate and an aperture centrally positioned in this upper plate, pins removably received in the apertures of the plate to hold the post in vertical position during operation outwardly extending from the ends of the post, the post of a length so that when it is in position with its pins in the plate apertures, there is sufficient clearance at the top to permit lifting of the post so that the lower pin is clear of the aperture for removal of the post, the plates having sufficient load bearing strength when secured in position in the van to withstand a predetermined weight of object when lifted or lowered by the lift means.
2. A system according to claim 1 wherein the lift means comprises a chain block means releasably secured to said other end of the arm.
3. A hoist system according to claim 2 wherein the chain block means includes a hand-operated ratchet mechanism for lifting and lowering the object.
4. A system according to claim 1 wherein the arm is pivotally secured to the post near its top, and a brace member having two ends is pivotally secured at one end near the bottom of the post, the other end of the brace member being releasably securable to the arm to support the arm horizontally.
5. A system according to claim 4 wherein the post, arm and brace means are of square tubular construction.
6. A system according to claim 4 wherein said other end of the brace means is provided with an aperture and plate means are secured to the arm so as to downwardly depend from the arm intermediate its ends when in horizontal position, the plate means having an aperture alignable with said aperture in the brace means when the arm is in horizontal orientation, pin means being provided to be releasably seated in said apertures of the plate means and brace means when aligned, so that the brace means will then securely hold the arm in horizontal orientation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2039091 CA2039091A1 (en) | 1991-03-26 | 1991-03-26 | Removable hoist system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2039091 CA2039091A1 (en) | 1991-03-26 | 1991-03-26 | Removable hoist system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2039091A1 true CA2039091A1 (en) | 1992-09-27 |
Family
ID=4147267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2039091 Abandoned CA2039091A1 (en) | 1991-03-26 | 1991-03-26 | Removable hoist system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2039091A1 (en) |
-
1991
- 1991-03-26 CA CA 2039091 patent/CA2039091A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |