CA1073373A - High-reach work platform assembly - Google Patents
High-reach work platform assemblyInfo
- Publication number
- CA1073373A CA1073373A CA284,455A CA284455A CA1073373A CA 1073373 A CA1073373 A CA 1073373A CA 284455 A CA284455 A CA 284455A CA 1073373 A CA1073373 A CA 1073373A
- Authority
- CA
- Canada
- Prior art keywords
- pair
- pairs
- post
- base frame
- twin
- 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
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- Jib Cranes (AREA)
Abstract
ABSTRACT
Disclosed is a high-reach assembly which utilizes two, overlapping, series connected parallelogram linkages. The lowermost parallelogram is formed by twin, horizontally spaced linkages which permit the upper parallelogram linkage to nest between the lower, twin linkages. The upper linkage is longer than the lower, twin linkages and carries the work platform, so that the platform is outboard of the linkages when they are in folded, nested condition.
Disclosed is a high-reach assembly which utilizes two, overlapping, series connected parallelogram linkages. The lowermost parallelogram is formed by twin, horizontally spaced linkages which permit the upper parallelogram linkage to nest between the lower, twin linkages. The upper linkage is longer than the lower, twin linkages and carries the work platform, so that the platform is outboard of the linkages when they are in folded, nested condition.
Description
::
3~73 High-reach ~ork platforms. of the parallelogram linkage type are well known in the prior art. Examples of such structures are shown in Merrick 3,807,575, Stucky 3,768,591 and Jones et al. 3,283,850. The linkage of the present invention is characterized by use of spaced twin parallelograms at the lower level, the upper parallelogram linkage being nested between the twin linkage when th.e assembly is in folded or retracted position.
In this pos:ition the linkages are at acute angles with the spaced, stationary vertical members attached to the base, and, since the upper li.nkage is longer than the lower, the work platform is positioned outboard of the s.paced vertical members.
The assembly thus folds into the mi.nimum space for transport or storage. Also the platform assembly of thi.s, invention because of its s~mmetrical construction i.s better balanced and stronger than certain pri.or art devices as; shown in the Merrick United States Patent 3,807,575.
Accordin~ to the present invention there is provided a high-reach ~ork platform assembl~, comprising:
(.a~ a base frame;
(,bl two stationary members attached to said base frame, sai.d members bei:ng sp~aced apart and extendi,ng in a vertical, parallel relation up~ardly from sai.d bas.e frame;
(cl a fi,rst ~e~tical post;
~d~ t~o fi,rst pair of vertically spaced, co-extensive t~in li.nkage arms,, said first pairs being spaced laterally apart, sai.d first pairs bei.ng pi.votally attached at one of their ends -to the faci.ng surfaces: of said members and being further pivotally attached at thei.r opposi.te ends to the outer surfaces of said first ~ertical pos:t, said first post being su:Eficiently wi.de to span the lateral di.stance separating said first pairs;
te) a second vertical post;
(.f), a second pair of vertically spaced, co-extensive twin linkage arms pivotally attached one of their ends to said first post above the points of attachment of said first pairs, said second pair extending in overlying relation to and between said first pairs and ~eing further pivotally attached at their opposite ends to said second post, sai.d second pair of linkage arms being lon~er than said first pairs; .:
(.gl a work platform ri.gidly secured to and extending horizontally from sai,d second post aboye th.e points of attach-ment of said second pair;
(',h). a fir~t pai,r of extendable and retractable motor element means for pi.voti.ng s.aid firs.t pai.rs about said stationar~mem6ers:, sai,d ~i.rst means i.ncludi.ng a paix of hydrauli.c c~li.nders spaced laterally apart and pivotally connected between said ~ase frame and the lower linkage arms i,n said first pai.rs; and ~i,l a second extendable and ret~actable motor element means ~or pivoting said second pair about said first post, sai.d second means i:ncludi,ng a hydraulic cylinder pivotally connected between sai.d fi,rst post and the lower linkage arm in said se:cond pai.r, sai.d first means and sai.d second means, when re.tracted, causing said second pai.r of twin li.nkage arms to nest ~etwe.en sai.d fi.rst pairs, ~ith said first pairs and said second pair di~posed at acute angles to said first post at their pivotal attachments thereto and with said work platform adjacent to but outwardly of said stationary members.
In the accompanying dra~ings, which illustrate an exemplary embodiment of the present invention:
3Q Fig. 1 is a perspective view of the assembly in , ~:
3~73 High-reach ~ork platforms. of the parallelogram linkage type are well known in the prior art. Examples of such structures are shown in Merrick 3,807,575, Stucky 3,768,591 and Jones et al. 3,283,850. The linkage of the present invention is characterized by use of spaced twin parallelograms at the lower level, the upper parallelogram linkage being nested between the twin linkage when th.e assembly is in folded or retracted position.
In this pos:ition the linkages are at acute angles with the spaced, stationary vertical members attached to the base, and, since the upper li.nkage is longer than the lower, the work platform is positioned outboard of the s.paced vertical members.
The assembly thus folds into the mi.nimum space for transport or storage. Also the platform assembly of thi.s, invention because of its s~mmetrical construction i.s better balanced and stronger than certain pri.or art devices as; shown in the Merrick United States Patent 3,807,575.
Accordin~ to the present invention there is provided a high-reach ~ork platform assembl~, comprising:
(.a~ a base frame;
(,bl two stationary members attached to said base frame, sai.d members bei:ng sp~aced apart and extendi,ng in a vertical, parallel relation up~ardly from sai.d bas.e frame;
(cl a fi,rst ~e~tical post;
~d~ t~o fi,rst pair of vertically spaced, co-extensive t~in li.nkage arms,, said first pairs being spaced laterally apart, sai.d first pairs bei.ng pi.votally attached at one of their ends -to the faci.ng surfaces: of said members and being further pivotally attached at thei.r opposi.te ends to the outer surfaces of said first ~ertical pos:t, said first post being su:Eficiently wi.de to span the lateral di.stance separating said first pairs;
te) a second vertical post;
(.f), a second pair of vertically spaced, co-extensive twin linkage arms pivotally attached one of their ends to said first post above the points of attachment of said first pairs, said second pair extending in overlying relation to and between said first pairs and ~eing further pivotally attached at their opposite ends to said second post, sai.d second pair of linkage arms being lon~er than said first pairs; .:
(.gl a work platform ri.gidly secured to and extending horizontally from sai,d second post aboye th.e points of attach-ment of said second pair;
(',h). a fir~t pai,r of extendable and retractable motor element means for pi.voti.ng s.aid firs.t pai.rs about said stationar~mem6ers:, sai,d ~i.rst means i.ncludi.ng a paix of hydrauli.c c~li.nders spaced laterally apart and pivotally connected between said ~ase frame and the lower linkage arms i,n said first pai.rs; and ~i,l a second extendable and ret~actable motor element means ~or pivoting said second pair about said first post, sai.d second means i:ncludi,ng a hydraulic cylinder pivotally connected between sai.d fi,rst post and the lower linkage arm in said se:cond pai.r, sai.d first means and sai.d second means, when re.tracted, causing said second pai.r of twin li.nkage arms to nest ~etwe.en sai.d fi.rst pairs, ~ith said first pairs and said second pair di~posed at acute angles to said first post at their pivotal attachments thereto and with said work platform adjacent to but outwardly of said stationary members.
In the accompanying dra~ings, which illustrate an exemplary embodiment of the present invention:
3Q Fig. 1 is a perspective view of the assembly in , ~:
-2 ~
operation;
F;g. 2 is a side view of the assembly of Fig. 1 in retracted or folded condition; and Fig. 3 is a top plan view of the structure as shown in ~ig. 2.
Referring initially to Fig. 1, the assembly includes a generally rectangular base frame formed of side members 10 and 11 and two end members 12. Extending outwardly from the corner areas of the base frame are plates ~hich carry s~litable casters 13 and swingout stabilizi,ng jacks 14.
Stati,onary spaced members 16 and 17 extend in vertical, parallel relation upwardly from the base frame. Two pairs of vertically spaced, coextensive twin linkage arms are pivotally attached at one of their ends to the facing surfaces of each of said stationary~ members 16 and 17. One of the twin pairs of linkage arms is identlfi,ed at 21 and 22 in Fig. 1, the other pair being identifi,ed at 23 and 24 i,n Fi,g. 2. As will be obvious from Fig. 3, the twin pairs of parallelogram linkages are spaced apart horizontall~ an amount generally equal to the space between the vertical mem~ers 16 and 17.
Extendable and retractable motor elements, taking form of hydraulic cylinders 31 and 32 (,Figs. 1 and 2), are pivotally attached to the base frame and extend upwardly to be pivotally attached to parallel li,nkage components 24 and 22, respectively. Load transfer members 34 axe pivotally attached to, and extend between the linkage components 23-24 and 21-22.
The vertical members 16 and 17, which carry the twin, lower parallelogram linkages, are braced by the diagonals 59 which extend to the base frame.
The free ends of the twin parallelogram linkage members ! ~ 2 ~
73373 ~:
23-24 and 21-22 are p.;votally connected to a vertical post 36, ~hich may be of generally square configuration, and whose width spans the horizontal distance between the twin pair of linkage arms, as will be evident from Fig. 2.
An upper, or additional parallelogram linkage is formed by twin mem~ers 37 and 38 which are spaced vertically from each other and w~ich have bifurcated ends pivotally attached to the upper port;on of the post 36. A further extendable and retractable motor eIement, taking the form of the hydraulic cylinder 3~, is pivotally attach.ed to the b.ase of post 36 and extends to a suitabIe pivotal attachment 3~A ~Fig. 2~ to the :
lowermost linkage arm 38. Load transfer member 41 is pivotally attached to the~members.37 and 38 and spans the vertical distance between them. The ends of the li.nka~e ar~s 37 and 38 opposi.te the post 36 are pivotally attached to a second vertical ~J~
-2b-~L~7 ~37 post 42 and the post 42 carries, by means of suitable support members 43 and 44 (Fig. 2), a work platform 46 which has a guard rail structure 47 and a suitable bo~ 48 with suitable control push buttons. It will be understood that the pressure in the hydraulic cylinder 39 is controlled independently from that in the dual cylinders 32 and 33 and that the cylinder 39 has a separate "up" and "down" push button on the control box 48, as do, jointly, the paired hydraulic cylinders 32 and 33.
As indicated at 51 in Fig. 1, a suitable pump and drive motor may provide the necessary fluid pressure for the cylinders, pressurization of the working side of the pistons in the cylinders being controlled, as previously mentioned, by means of push button switches in the control box 48, these switches serving to energize and deenergize appropriate solenoid valves in the hydraulic line (not shown).
In operation, the assembly, initially, will have the stabilizing jacks folded against the side of the base frame and these are extended and leveled as shown in Fig. 1. The retracted or folded position of the structure is indicated in broken lines at A in Fig. 1 and is also shown in Fig. 2 The control ~8 may then be manually operated by the occupant of the work platforms to extend the hydraulic cylinder 39 thereby raising the work platform to the position indicated at B in Fig. l. Alternatively, the hydraulic cylinders 32 and 33 may be extended while leaving the cylinder 39 retracted and this places the work platform in the position indicated at C in Fig. 1. If, while maintaining the cylinders 32 and 33 extended, the hydraulic cylinder 39 is extended, the linkage 37-38 will assume its solid line position of Fig. l and the work platform will be raised to its uppermost position.
By releasing the control buttons at the proper time, the work '73 platform may be locked in position at any desi.red height between the folded position (A) of Fig. 1 and its extended (solid line) position of Fig. 1. By simultaneously retracting or extending hydraulic c~linder 39 with the opposite action occurring with the paid cylinder~ 32 and 33, the work platform may be moved in a generally hori.zontal path., for example, between the broken line positi.ons C and D of Fig. 1. :~
These pivotal attachments mentioned abo~e for the several pairs of t~in li.nkage arms may be accomplished by use of adjustable bolts, as sh.own in Fig. 2. For example, in this preferred em~odiment the t~in pai.rs of linkage arms 21-22 and 23-24 are bolted at one o~ their ends to two inner plates or ears 53 connected to the faci.ng surfaces. of the stationary members 16 and 17, as better shown in Fig. 3.
,~' i,
operation;
F;g. 2 is a side view of the assembly of Fig. 1 in retracted or folded condition; and Fig. 3 is a top plan view of the structure as shown in ~ig. 2.
Referring initially to Fig. 1, the assembly includes a generally rectangular base frame formed of side members 10 and 11 and two end members 12. Extending outwardly from the corner areas of the base frame are plates ~hich carry s~litable casters 13 and swingout stabilizi,ng jacks 14.
Stati,onary spaced members 16 and 17 extend in vertical, parallel relation upwardly from the base frame. Two pairs of vertically spaced, coextensive twin linkage arms are pivotally attached at one of their ends to the facing surfaces of each of said stationary~ members 16 and 17. One of the twin pairs of linkage arms is identlfi,ed at 21 and 22 in Fig. 1, the other pair being identifi,ed at 23 and 24 i,n Fi,g. 2. As will be obvious from Fig. 3, the twin pairs of parallelogram linkages are spaced apart horizontall~ an amount generally equal to the space between the vertical mem~ers 16 and 17.
Extendable and retractable motor elements, taking form of hydraulic cylinders 31 and 32 (,Figs. 1 and 2), are pivotally attached to the base frame and extend upwardly to be pivotally attached to parallel li,nkage components 24 and 22, respectively. Load transfer members 34 axe pivotally attached to, and extend between the linkage components 23-24 and 21-22.
The vertical members 16 and 17, which carry the twin, lower parallelogram linkages, are braced by the diagonals 59 which extend to the base frame.
The free ends of the twin parallelogram linkage members ! ~ 2 ~
73373 ~:
23-24 and 21-22 are p.;votally connected to a vertical post 36, ~hich may be of generally square configuration, and whose width spans the horizontal distance between the twin pair of linkage arms, as will be evident from Fig. 2.
An upper, or additional parallelogram linkage is formed by twin mem~ers 37 and 38 which are spaced vertically from each other and w~ich have bifurcated ends pivotally attached to the upper port;on of the post 36. A further extendable and retractable motor eIement, taking the form of the hydraulic cylinder 3~, is pivotally attach.ed to the b.ase of post 36 and extends to a suitabIe pivotal attachment 3~A ~Fig. 2~ to the :
lowermost linkage arm 38. Load transfer member 41 is pivotally attached to the~members.37 and 38 and spans the vertical distance between them. The ends of the li.nka~e ar~s 37 and 38 opposi.te the post 36 are pivotally attached to a second vertical ~J~
-2b-~L~7 ~37 post 42 and the post 42 carries, by means of suitable support members 43 and 44 (Fig. 2), a work platform 46 which has a guard rail structure 47 and a suitable bo~ 48 with suitable control push buttons. It will be understood that the pressure in the hydraulic cylinder 39 is controlled independently from that in the dual cylinders 32 and 33 and that the cylinder 39 has a separate "up" and "down" push button on the control box 48, as do, jointly, the paired hydraulic cylinders 32 and 33.
As indicated at 51 in Fig. 1, a suitable pump and drive motor may provide the necessary fluid pressure for the cylinders, pressurization of the working side of the pistons in the cylinders being controlled, as previously mentioned, by means of push button switches in the control box 48, these switches serving to energize and deenergize appropriate solenoid valves in the hydraulic line (not shown).
In operation, the assembly, initially, will have the stabilizing jacks folded against the side of the base frame and these are extended and leveled as shown in Fig. 1. The retracted or folded position of the structure is indicated in broken lines at A in Fig. 1 and is also shown in Fig. 2 The control ~8 may then be manually operated by the occupant of the work platforms to extend the hydraulic cylinder 39 thereby raising the work platform to the position indicated at B in Fig. l. Alternatively, the hydraulic cylinders 32 and 33 may be extended while leaving the cylinder 39 retracted and this places the work platform in the position indicated at C in Fig. 1. If, while maintaining the cylinders 32 and 33 extended, the hydraulic cylinder 39 is extended, the linkage 37-38 will assume its solid line position of Fig. l and the work platform will be raised to its uppermost position.
By releasing the control buttons at the proper time, the work '73 platform may be locked in position at any desi.red height between the folded position (A) of Fig. 1 and its extended (solid line) position of Fig. 1. By simultaneously retracting or extending hydraulic c~linder 39 with the opposite action occurring with the paid cylinder~ 32 and 33, the work platform may be moved in a generally hori.zontal path., for example, between the broken line positi.ons C and D of Fig. 1. :~
These pivotal attachments mentioned abo~e for the several pairs of t~in li.nkage arms may be accomplished by use of adjustable bolts, as sh.own in Fig. 2. For example, in this preferred em~odiment the t~in pai.rs of linkage arms 21-22 and 23-24 are bolted at one o~ their ends to two inner plates or ears 53 connected to the faci.ng surfaces. of the stationary members 16 and 17, as better shown in Fig. 3.
,~' i,
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A high-reach work platform assembly, comprising:
(a) a base frame;
(b) two stationary members attached to said base frame, said members being spaced apart and extending in a vertical, parallel relation upwardly from said base frame;
(c) a first vertical post;
(d) two first pair of vertically spaced, co-extensive twin linkage arms, said first pairs being spaced laterally apart, said first pairs being pivotally attached at one of their ends to the facing surfaces of said members and being further piYotally attached at their opposite ends to the outer surfaces of said first vertical post, said first post being sufficiently wide to span the lateral distance separating said first pairs;
(e) a second vertical post;
(f) a second pair of vertically spaced, co-extensive twin linkage arms pivotally attached one of their ends to said first post above the points of attachment of said first pairs, said second pair extending in overlying relation to and between said first pairs and being further pivotally attached at their opposite ends to said second post, said second pair of linkage arms being longer than said first pairs;
(g) a work platform rigidly secured to and extending horizontally from said second post above the points of attach-ment of said second pair;
(h) a first pair of extendable and retractable motor element means for pivoting said first pairs about said stationary members, said first means including a pair of hydraulic cylinders spaced laterally apart and pivotally connected between said base frame and the lower linkage arms in said first pairs;
and (i) a second extendable and retractable motor element means for pivoting said second pair about said first post, said second means including a hydraulic cylinder pivotally connected between said first post and the lower linkage arm in said second pair, said first means and said second means, when retracted, causing said second pair of twin linkage arms to nest between said first pairs, with said first pairs and said second pair disposed at acute angles to said first post at their pivotal attachments thereto and with said work platform adjacent to but outwardly of said stationary members.
(a) a base frame;
(b) two stationary members attached to said base frame, said members being spaced apart and extending in a vertical, parallel relation upwardly from said base frame;
(c) a first vertical post;
(d) two first pair of vertically spaced, co-extensive twin linkage arms, said first pairs being spaced laterally apart, said first pairs being pivotally attached at one of their ends to the facing surfaces of said members and being further piYotally attached at their opposite ends to the outer surfaces of said first vertical post, said first post being sufficiently wide to span the lateral distance separating said first pairs;
(e) a second vertical post;
(f) a second pair of vertically spaced, co-extensive twin linkage arms pivotally attached one of their ends to said first post above the points of attachment of said first pairs, said second pair extending in overlying relation to and between said first pairs and being further pivotally attached at their opposite ends to said second post, said second pair of linkage arms being longer than said first pairs;
(g) a work platform rigidly secured to and extending horizontally from said second post above the points of attach-ment of said second pair;
(h) a first pair of extendable and retractable motor element means for pivoting said first pairs about said stationary members, said first means including a pair of hydraulic cylinders spaced laterally apart and pivotally connected between said base frame and the lower linkage arms in said first pairs;
and (i) a second extendable and retractable motor element means for pivoting said second pair about said first post, said second means including a hydraulic cylinder pivotally connected between said first post and the lower linkage arm in said second pair, said first means and said second means, when retracted, causing said second pair of twin linkage arms to nest between said first pairs, with said first pairs and said second pair disposed at acute angles to said first post at their pivotal attachments thereto and with said work platform adjacent to but outwardly of said stationary members.
2. The assembly in claim 1 additionally comprising a load transfer member pivotally attached between each of the vertically spaced twin linkage arms in said first pairs and in said second pair thereof for better distributing the encountered load and stabilizing the work platform assembly.
3. The assembly in claim 2 in which the pivotal attach-ments for said first pairs and said second pair of twin linkage arms include adjustable bolts.
4. The attachment of claim 3 in which said base frame has a generally rectangular configuration, the work platform assembly additionally comprising:
(a) a swing-out stabilizing jack at each corner of said base frame; and (b) a diagonal brace rigidly connected between said base frame and each of said stationary members.
(a) a swing-out stabilizing jack at each corner of said base frame; and (b) a diagonal brace rigidly connected between said base frame and each of said stationary members.
5. The assembly in claim 4 in which the one ends of said first pair of twin linkage arms are pivotally bolted to two inner plates connected to the facing surfaces of said stationary members.
SMART & BIGGAR
OTTAWA, CANADA
PATENT AGENTS
SMART & BIGGAR
OTTAWA, CANADA
PATENT AGENTS
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75562876A | 1976-12-30 | 1976-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073373A true CA1073373A (en) | 1980-03-11 |
Family
ID=25039925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA284,455A Expired CA1073373A (en) | 1976-12-30 | 1977-08-10 | High-reach work platform assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1073373A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107381450A (en) * | 2017-07-13 | 2017-11-24 | 合肥余塝电子商务有限公司 | A kind of communication apparatus maintenance shears |
-
1977
- 1977-08-10 CA CA284,455A patent/CA1073373A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107381450A (en) * | 2017-07-13 | 2017-11-24 | 合肥余塝电子商务有限公司 | A kind of communication apparatus maintenance shears |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |