CA2035866A1 - Hoist - Google Patents
HoistInfo
- Publication number
- CA2035866A1 CA2035866A1 CA 2035866 CA2035866A CA2035866A1 CA 2035866 A1 CA2035866 A1 CA 2035866A1 CA 2035866 CA2035866 CA 2035866 CA 2035866 A CA2035866 A CA 2035866A CA 2035866 A1 CA2035866 A1 CA 2035866A1
- Authority
- CA
- Canada
- Prior art keywords
- hoist
- wheel
- drag shoe
- frame
- spindle
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B5/00—Accessories or details specially adapted for hand carts
- B62B5/02—Accessories or details specially adapted for hand carts providing for travelling up or down a flight of stairs
- B62B5/023—Accessories or details specially adapted for hand carts providing for travelling up or down a flight of stairs using an upwards pushing device
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Handcart (AREA)
Abstract
(57) Abstract The invention concerns a hoist (1) for transporting loads, even over steps (26), the hoist having a frame (2) with a wheel-set (4) and a spindle (3) running along the longitudinal axis of the frame (2) plus a sliding carriage (5) mountedto slide on the frame (2) and designed to carry the load (6), the sliding carriage being connected to a spindle nut running on the spindle (3). In order to ensure that the hoist remains stationary when transporting loads over steps it is pro-posed that each of the wheels (4) is fitted with a drag shoe (22) which is mount-ed to rotate about the wheel axle (21) and which has a base (23, 24) which sup-ports the hoist (1) when transporting loads (6) over steps (26).
Description
`:
A hoist .. . .
The present invention relates to a hoist according to the preamble of claim 1.
A known hoist of this type has a frame with a handle and a wheelset affixed to its lower end. A spindle extends in the longitudinal direction of th~ frame, its spindle nut being connected to a slide mounted slidingly in the frame, on which the load can be placed. Such a hoist can be used to transport loads up to 500 kilograms, even over stairs. For this purpose the hoist is inclined on the lower landing until the lower end of the slide is supported on the ground. A battery-oper-ated motor is then used to operate the spindle and move the frame upwardly until the wheels are at the level of the sec-ond stair. By inclination the wheels are set down on this second stair. Thereafter, the spindle moves the slide sup-porting the load upwardly until the slide can be set down on a stair situated below the wheels. The hoist is then inclined again, thereby lifting the wheelset from the stair. The frame .:: .
is again moved upwardly until the wheels can be lowered onto ~ the next higher stair. The game is repeated until the load i~
;~ conveyed onto the landing. In the reverse way the load can also be conveyed downstairs.
In this hoist the wheels are brakeless, which is unac-; i ceptable for safety reasons in particular if the load is to be transported over stairs. For safety reasons one must make sure that if the load is supported only via the wheels when being moved upward along stairs, the wheels remain station-ary.
The invention is accordingly based on the problem of stating a device of simple construction which permits the hoist to be kept stationary reliably when a load is being transported over stairs and which simplifies this transport.
This problem is solved according to the invention by the features stated in the characterizing part of claim 1.
Thus, each wheel is provided with a pivoted drag shoe ~;
that, during transport of the load over stairs, is swiveled into a position such that the hoist is supported on a stair on a base of this drag shoe. When the drag shoe is no longer required it can be swiveled back into its resting position and held e.g. by a bolt in this position, in which the wheel ~ -,, - . .
can be released and the hoist pushed or pulled rollingly in the conventional way. The drag shoe preferably has an operat~
ing lever that the operator of the hoist moves with his foot -to put the drag shoe into one of its operating positions.
The drag shoe can have e.g. the form of a hood partly surrounding.the wheel, whereby the level base is provided - `
with a friction facing or stair-protecting facing.
~. ::;
. , ~ -In the drag shoe one can additionally provide supporting rods to be moved out at different lengths. In particular in ~;:
the case of narrow stairs, these extension rods can serve to support the hoist additionally on a stair below the drag shoe. It has turned out that the transport of the load over stairs can be simplified further if such extension rods are also provided on the slide. The hoist is then supported by these extension rods on a stair below the drag shoe so that the lower end of the slide with the load is lqcated at the ~ i level of the stair on which the drag shoe also lies. These extension rods can be moved out quickly by a screw/bayonet joint. For handling the hoist when transporting a load over the stairs, the center of gravity of the load is closer to ~ ;
the wheel axle, which is more favorable. Also, such a con- ~ -struction facilitates the transport of a load e.g. through narrow winding staircases.
" r " ' ~' " "~ '.:''~' ;'. ' : . ~ " '' ' ., ' ': " " " ~
One could consider interconnecting the two drag shoes of the wheels so that they can be swiveled jointly. But this solution is unfavorable for transport through narrow winding staircases since in such staircases the entire hoist must also be swiveled about its longitudinal axis so that one wheel should remain freely rotatable.
Further embodiments of the invention can be found in the subclaims.
The invention iisi explained in more detail in embodiment examples with reference to the drawing, in which: -Fig. 1 shows a perspective aspect of a hoist according to the invention;
Fig. 2 shows a perspective view of the hoist according to Fig. 1 during transport of a load over stairs, ! .
- Figs. 3a to 3c show schematic views of the mode of opera~
tion of a generic hoist, Fig. 4 shows a perspective view of a modified hoist ac-cording to the invention, Figs. 5a, 5b and 5c show an aspect and sections through an extension rod of a drag shoe, and ~ Fig. 6 shows a further embodiment of a hoist according to ~ ;;~ the invention.
A hoist 1 has, as its essential parts, a frame 2, a spin-dle 3 extending through its center in the longitudinal direc- -tion, two wheels 4 connected with frame 2 in the vicinity of its lower end, and a slide 5 mounted slidingly on the frame for a load 6 to be mounted on. Frame 2 has two longitudinal stretchers 7 interconnected by a traverse 8 at the upper end -~
of hoist 1. Here there is also a handle 9 in the form of a :
plurality of bars. On the underside of the frame, longitudi-nal stretchers 7 are interconnected by a drive gearbox 10 containing a battery-operated drive motor for spindle 3.
Slide 5 has two longitudinal stretchers 12 interconnected by a plurality of traverses 14, the undermost traverse being provided with a shovel 15 against which the load is support-ed. This shovel 15 is also connected with a rotary table 16, so that the hoist, set down on this rotary table 16, can be rotated about the rotational axis of the table. This facili- ~-tates in particular the maneuvering of the hoist e.g. on nar-row landings~ Uppermost traverse 14 of slide 5 is connected with a spindle nut running on spindle 3 so that, by actuating the drive motor, slide 5 can be displaced along frame 2 in two directions.
A drag shoe 22 is pivoted to axle 21 of each wheel 4 r having in this case the form of a hood partly surrounding the wheel with an approximately rectangular aspect. This drag shoe 22 has a level base 23 on its side facing away from the wheel, said base being covered with a friction facing or stair-protecting facing 24. In the inoperative position of `
the drag shoe shown in Fig. 1, the shoe is held by locking members 27 in such a way that wheel 4 is released and the hoist can be pushed or pulled rollingly. Drag shoe 22 has an operating lever 25 that the operator of the hoist can push with his foot to move drag shoe 22 into its operating posi-tion shown in Fig. 2, in which hoist 1 is supported on a stair 2i6 by drag shoe 22~ r~
The operation of hoist 1 shall be explained with refer-ence to Figs. 3a to 3c.
. A
In normal operation on level ground, the hoist carrying load 6 is pu~hed or pulled rollingly on wheels 4. If the .
`~ load is to be transported over staircase 26 with e.g. five ;~
`~ stairs S1 to S5~ the hoist is drawn toward lowest stair S1, as shown in Fig. 3a, and inclined in such a way that slide 5 '.' ":'"' :"
~;; 5 is supported with its shovel 15 on the ground. By actuating spindle 3 one moves frame 2 upwardly in the direction of the arrow in Fig. 3a, thereby lifting the wheels off the ground.
Then operating lever 25 is pushed so that drag shoe 22 swiv-els by gravity into a vertical position in which base 23 is vertical under wheel 4. Frame 2 is then moved with wheels 4 with the aid of spindle 3 until ~rag shoe 22 can be lowered ;
onto stair S2; cf. Fig. 3b. The hoist is reliably kept sta-tionary in this position while still remaining pivotable about the wheel axle, which is necessary for the functioning of the hoist. Spindle 3 is then operated to move slide 5 -~
upwardly, until the latter can be supported on stair Sl, as -shown in Fig. 3c. During this displacement process the load rests safely on drag shoes 22. This process is repeated until the load can be set down on the landing on stair 55. If the staircase has a bend the hoist is rotated on rotary table 16 and transported over the next stair in the same way. If the hoist must then be moved on a level plane again, drag shoes ; 22 are returned to their locked position as in Fig. 1.
~ ~ , Fig. 4 again shows a hoist 1 having the same construction as the hoist in Figs. 1 and 2 except for the design of the drag shoe. Each drag shoe 22' of this hoist has an extension ~;~ rod 31 with a base 32 which is vertical in the operating position of drag shoe 22' during transport of a load over stairs and can be moved out of drag shoe 22' by a guide means 33 and a screw/bayonet joint 34 and fixed at any desired length. This is advantageous in particular if hoist 1 is used to transport a load through a narrow winding staircase in which the base of drag shoe 22' does not lie entirely on a ~; stair, as shown in Fig. 4. Extension rod 31 is then moved out so far that its base 32 lies on the stair therebelow and thus supports the hoist. This construction permits the hoist to be supported on stairs of different heights.
As shown in Fig. 5a, extension rods 31 are rods stepped in their longitudinal direction and bearing a thread in their middle area. The rods are introduced with their tapering end , through a slotted nut 34 and with an upper stepped area into slotted guide means 33 and then screwed with their thread into nut 34 as far as the desired length. ;~
Hoist 1 according to Fig. 5 likewise has the same con~
struction as the hoist of Figs. 1 and 2 except that slide 5' is modified in such a way that extension rods 41 are provided on its outer stretchers 12. Like extension rods 31, these ~ ~-rods can be moved out by two screw/bayonet joints 42 parallel to the longitudinal stretchers of the slide and locked in any ;~
desired position. During transport over stairs the hoist is thus no longer supported directly on shovel lS of the slide, `~
but via flats 43 welded on extension rods 41. In this case ~ `
the center of gravity of the load has a more favorable loca- ~;
tion than in the above-mentioned embodiments. Also, transport ~ ~
through narrow winding staircases is facilitated, whereby ~ -- only one of the extension rods need be moved out.
: ~ ~ " :
..'--'.
:,:; ;,:
~`,''.,'''' ,' '" .,':
A hoist .. . .
The present invention relates to a hoist according to the preamble of claim 1.
A known hoist of this type has a frame with a handle and a wheelset affixed to its lower end. A spindle extends in the longitudinal direction of th~ frame, its spindle nut being connected to a slide mounted slidingly in the frame, on which the load can be placed. Such a hoist can be used to transport loads up to 500 kilograms, even over stairs. For this purpose the hoist is inclined on the lower landing until the lower end of the slide is supported on the ground. A battery-oper-ated motor is then used to operate the spindle and move the frame upwardly until the wheels are at the level of the sec-ond stair. By inclination the wheels are set down on this second stair. Thereafter, the spindle moves the slide sup-porting the load upwardly until the slide can be set down on a stair situated below the wheels. The hoist is then inclined again, thereby lifting the wheelset from the stair. The frame .:: .
is again moved upwardly until the wheels can be lowered onto ~ the next higher stair. The game is repeated until the load i~
;~ conveyed onto the landing. In the reverse way the load can also be conveyed downstairs.
In this hoist the wheels are brakeless, which is unac-; i ceptable for safety reasons in particular if the load is to be transported over stairs. For safety reasons one must make sure that if the load is supported only via the wheels when being moved upward along stairs, the wheels remain station-ary.
The invention is accordingly based on the problem of stating a device of simple construction which permits the hoist to be kept stationary reliably when a load is being transported over stairs and which simplifies this transport.
This problem is solved according to the invention by the features stated in the characterizing part of claim 1.
Thus, each wheel is provided with a pivoted drag shoe ~;
that, during transport of the load over stairs, is swiveled into a position such that the hoist is supported on a stair on a base of this drag shoe. When the drag shoe is no longer required it can be swiveled back into its resting position and held e.g. by a bolt in this position, in which the wheel ~ -,, - . .
can be released and the hoist pushed or pulled rollingly in the conventional way. The drag shoe preferably has an operat~
ing lever that the operator of the hoist moves with his foot -to put the drag shoe into one of its operating positions.
The drag shoe can have e.g. the form of a hood partly surrounding.the wheel, whereby the level base is provided - `
with a friction facing or stair-protecting facing.
~. ::;
. , ~ -In the drag shoe one can additionally provide supporting rods to be moved out at different lengths. In particular in ~;:
the case of narrow stairs, these extension rods can serve to support the hoist additionally on a stair below the drag shoe. It has turned out that the transport of the load over stairs can be simplified further if such extension rods are also provided on the slide. The hoist is then supported by these extension rods on a stair below the drag shoe so that the lower end of the slide with the load is lqcated at the ~ i level of the stair on which the drag shoe also lies. These extension rods can be moved out quickly by a screw/bayonet joint. For handling the hoist when transporting a load over the stairs, the center of gravity of the load is closer to ~ ;
the wheel axle, which is more favorable. Also, such a con- ~ -struction facilitates the transport of a load e.g. through narrow winding staircases.
" r " ' ~' " "~ '.:''~' ;'. ' : . ~ " '' ' ., ' ': " " " ~
One could consider interconnecting the two drag shoes of the wheels so that they can be swiveled jointly. But this solution is unfavorable for transport through narrow winding staircases since in such staircases the entire hoist must also be swiveled about its longitudinal axis so that one wheel should remain freely rotatable.
Further embodiments of the invention can be found in the subclaims.
The invention iisi explained in more detail in embodiment examples with reference to the drawing, in which: -Fig. 1 shows a perspective aspect of a hoist according to the invention;
Fig. 2 shows a perspective view of the hoist according to Fig. 1 during transport of a load over stairs, ! .
- Figs. 3a to 3c show schematic views of the mode of opera~
tion of a generic hoist, Fig. 4 shows a perspective view of a modified hoist ac-cording to the invention, Figs. 5a, 5b and 5c show an aspect and sections through an extension rod of a drag shoe, and ~ Fig. 6 shows a further embodiment of a hoist according to ~ ;;~ the invention.
A hoist 1 has, as its essential parts, a frame 2, a spin-dle 3 extending through its center in the longitudinal direc- -tion, two wheels 4 connected with frame 2 in the vicinity of its lower end, and a slide 5 mounted slidingly on the frame for a load 6 to be mounted on. Frame 2 has two longitudinal stretchers 7 interconnected by a traverse 8 at the upper end -~
of hoist 1. Here there is also a handle 9 in the form of a :
plurality of bars. On the underside of the frame, longitudi-nal stretchers 7 are interconnected by a drive gearbox 10 containing a battery-operated drive motor for spindle 3.
Slide 5 has two longitudinal stretchers 12 interconnected by a plurality of traverses 14, the undermost traverse being provided with a shovel 15 against which the load is support-ed. This shovel 15 is also connected with a rotary table 16, so that the hoist, set down on this rotary table 16, can be rotated about the rotational axis of the table. This facili- ~-tates in particular the maneuvering of the hoist e.g. on nar-row landings~ Uppermost traverse 14 of slide 5 is connected with a spindle nut running on spindle 3 so that, by actuating the drive motor, slide 5 can be displaced along frame 2 in two directions.
A drag shoe 22 is pivoted to axle 21 of each wheel 4 r having in this case the form of a hood partly surrounding the wheel with an approximately rectangular aspect. This drag shoe 22 has a level base 23 on its side facing away from the wheel, said base being covered with a friction facing or stair-protecting facing 24. In the inoperative position of `
the drag shoe shown in Fig. 1, the shoe is held by locking members 27 in such a way that wheel 4 is released and the hoist can be pushed or pulled rollingly. Drag shoe 22 has an operating lever 25 that the operator of the hoist can push with his foot to move drag shoe 22 into its operating posi-tion shown in Fig. 2, in which hoist 1 is supported on a stair 2i6 by drag shoe 22~ r~
The operation of hoist 1 shall be explained with refer-ence to Figs. 3a to 3c.
. A
In normal operation on level ground, the hoist carrying load 6 is pu~hed or pulled rollingly on wheels 4. If the .
`~ load is to be transported over staircase 26 with e.g. five ;~
`~ stairs S1 to S5~ the hoist is drawn toward lowest stair S1, as shown in Fig. 3a, and inclined in such a way that slide 5 '.' ":'"' :"
~;; 5 is supported with its shovel 15 on the ground. By actuating spindle 3 one moves frame 2 upwardly in the direction of the arrow in Fig. 3a, thereby lifting the wheels off the ground.
Then operating lever 25 is pushed so that drag shoe 22 swiv-els by gravity into a vertical position in which base 23 is vertical under wheel 4. Frame 2 is then moved with wheels 4 with the aid of spindle 3 until ~rag shoe 22 can be lowered ;
onto stair S2; cf. Fig. 3b. The hoist is reliably kept sta-tionary in this position while still remaining pivotable about the wheel axle, which is necessary for the functioning of the hoist. Spindle 3 is then operated to move slide 5 -~
upwardly, until the latter can be supported on stair Sl, as -shown in Fig. 3c. During this displacement process the load rests safely on drag shoes 22. This process is repeated until the load can be set down on the landing on stair 55. If the staircase has a bend the hoist is rotated on rotary table 16 and transported over the next stair in the same way. If the hoist must then be moved on a level plane again, drag shoes ; 22 are returned to their locked position as in Fig. 1.
~ ~ , Fig. 4 again shows a hoist 1 having the same construction as the hoist in Figs. 1 and 2 except for the design of the drag shoe. Each drag shoe 22' of this hoist has an extension ~;~ rod 31 with a base 32 which is vertical in the operating position of drag shoe 22' during transport of a load over stairs and can be moved out of drag shoe 22' by a guide means 33 and a screw/bayonet joint 34 and fixed at any desired length. This is advantageous in particular if hoist 1 is used to transport a load through a narrow winding staircase in which the base of drag shoe 22' does not lie entirely on a ~; stair, as shown in Fig. 4. Extension rod 31 is then moved out so far that its base 32 lies on the stair therebelow and thus supports the hoist. This construction permits the hoist to be supported on stairs of different heights.
As shown in Fig. 5a, extension rods 31 are rods stepped in their longitudinal direction and bearing a thread in their middle area. The rods are introduced with their tapering end , through a slotted nut 34 and with an upper stepped area into slotted guide means 33 and then screwed with their thread into nut 34 as far as the desired length. ;~
Hoist 1 according to Fig. 5 likewise has the same con~
struction as the hoist of Figs. 1 and 2 except that slide 5' is modified in such a way that extension rods 41 are provided on its outer stretchers 12. Like extension rods 31, these ~ ~-rods can be moved out by two screw/bayonet joints 42 parallel to the longitudinal stretchers of the slide and locked in any ;~
desired position. During transport over stairs the hoist is thus no longer supported directly on shovel lS of the slide, `~
but via flats 43 welded on extension rods 41. In this case ~ `
the center of gravity of the load has a more favorable loca- ~;
tion than in the above-mentioned embodiments. Also, transport ~ ~
through narrow winding staircases is facilitated, whereby ~ -- only one of the extension rods need be moved out.
: ~ ~ " :
..'--'.
:,:; ;,:
~`,''.,'''' ,' '" .,':
Claims (8)
1. A hoist for transporting loads, even over stairs, com-prising a frame having a wheelset and a driven spindle ex-tending in the longitudinal direction of the frame, and a slide mounted slidingly on the frame for taking up the load and connected with a spindle nut running on the spindle, characterized in that each wheel (4) of the wheel pair is provided with a drag shoe (22) that is pivoted about the wheel axle (21) and has a base (23, 24) lying in a plane parallel to the wheel axle (21), the plane being spaced from the wheel axle (21) by a distance greater than the wheel radius.
2. The hoist of claim 1, characterized in that the drag shoe is provided with an operating lever (25) for swiveling the drag shoe (22).
3. The hoist of claim 1 or 2, characterized in that the drag shoe (22) is designed as a hood at least partly covering the wheel (4).
4. The hoist of any of the preceding claims, character-ized in that the base (23, 24) of the drag shoe (22) is pro-vided with a friction facing or stair-protecting facing (24).
5. The hoist of any of the preceding claims, character-ized in that extension rods (31) are mounted on the drag shoe which can be locked in their moved out position with the aid of lock-type joints (33).
6. The hoist of any of the preceding claims, character-ized in that the slide (5') of the hoist (1) is provided with extension rods (41) that can be moved out in its longitudinal direction and locked in the moved out position.
7. The hoist of claim 5 or 6, characterized in that the extension rods (31, 41) can be fixed in their moved out posi-tion with screw/bayonet joints.
8. The hoist of any of the preceding claims, character-ized in that the slide (5) is provided on its shovel (15) with a rotary table (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893922468 DE3922468A1 (en) | 1989-07-07 | 1989-07-07 | LIFTER |
| DEP3922468.6 | 1989-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2035866A1 true CA2035866A1 (en) | 1991-01-08 |
Family
ID=6384543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2035866 Abandoned CA2035866A1 (en) | 1989-07-07 | 1990-07-06 | Hoist |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2035866A1 (en) |
| DE (1) | DE3922468A1 (en) |
| WO (1) | WO1991000817A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230219610A1 (en) * | 2022-01-12 | 2023-07-13 | Eliezer Friedman | Mechanical hand trucks with enhanced stair climbing and descending capability |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2926773B1 (en) * | 2008-01-25 | 2010-06-04 | Inst Nat Rech Securite | DEVICE FOR HANDLING A LOAD |
| CN102689642B (en) * | 2012-01-06 | 2013-12-25 | 河南科技大学 | Cart capable of walking on steps |
| CN106218691B (en) * | 2016-10-13 | 2018-11-27 | 重庆理工大学 | A kind of lifting ladder trolley |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2192396A (en) * | 1938-07-12 | 1940-03-05 | Frederick W Burch | Stair climbing hand truck |
| DE801755C (en) * | 1948-12-03 | 1951-01-22 | Fritz Kirchhoff | Hand truck or the like |
| US2641325A (en) * | 1950-06-05 | 1953-06-09 | George L Hoffman | Stair lift hand truck |
| US3417831A (en) * | 1966-08-15 | 1968-12-24 | Samuel H. Lake Jr. | Hand truck with power lift |
| US3494440A (en) * | 1968-01-24 | 1970-02-10 | Ubert P Hanson | Device for moving heavy objects up and down stairs |
| US3907138A (en) * | 1973-07-02 | 1975-09-23 | Woodward Mfg & Sales Co | Power control hand truck |
| US3896904A (en) * | 1974-04-29 | 1975-07-29 | Bruce A Walker | Two-wheel hand truck with elevator |
| GB1591116A (en) * | 1976-09-27 | 1981-06-17 | Jeavons P K | Elevating hand truck |
| CH627696A5 (en) * | 1978-03-07 | 1982-01-29 | Erich Iselin | Trolley for going up and down stairs |
| US4570953A (en) * | 1983-03-01 | 1986-02-18 | Ultra Lift Corporation | Stair-climbing hand truck |
| CH664146A5 (en) * | 1985-12-06 | 1988-02-15 | Gavest S A | Hand propelled trolley - has fork lift mounted on sliding frame actuated by electrically-driven screwed spindles |
-
1989
- 1989-07-07 DE DE19893922468 patent/DE3922468A1/en active Granted
-
1990
- 1990-07-06 WO PCT/DE1990/000503 patent/WO1991000817A1/en not_active Ceased
- 1990-07-06 CA CA 2035866 patent/CA2035866A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230219610A1 (en) * | 2022-01-12 | 2023-07-13 | Eliezer Friedman | Mechanical hand trucks with enhanced stair climbing and descending capability |
| US11794798B2 (en) * | 2022-01-12 | 2023-10-24 | Eliezer Friedman | Mechanical hand trucks with enhanced stair climbing and descending capability |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3922468A1 (en) | 1991-01-17 |
| DE3922468C2 (en) | 1991-06-06 |
| WO1991000817A1 (en) | 1991-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |