CA1071148A - Hand truck - Google Patents
Hand truckInfo
- Publication number
- CA1071148A CA1071148A CA262,077A CA262077A CA1071148A CA 1071148 A CA1071148 A CA 1071148A CA 262077 A CA262077 A CA 262077A CA 1071148 A CA1071148 A CA 1071148A
- Authority
- CA
- Canada
- Prior art keywords
- trolley
- frame
- hand truck
- main frame
- truck
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
TITLE
Hand Truck INVENTORS
Peter Kenneth Jeavons William Harold Hughes ABSTRACT OF THE DISCLOSURE
An elevating hand truck preserves the relative relation between load and main frame, yet allows relative migration of the wheels along the hand truck, under the influence of a power source, so that the hand truck can be used as an elevating hand truck for elevating loads from one elevation to another without the need to manhandle the load. This is achieved by requiring the wheels of the hand truck to act as a moving fulcrum along but within the extent of the frame of the truck and to require the load to be fixedly engaged onto the truck frame.
Hand Truck INVENTORS
Peter Kenneth Jeavons William Harold Hughes ABSTRACT OF THE DISCLOSURE
An elevating hand truck preserves the relative relation between load and main frame, yet allows relative migration of the wheels along the hand truck, under the influence of a power source, so that the hand truck can be used as an elevating hand truck for elevating loads from one elevation to another without the need to manhandle the load. This is achieved by requiring the wheels of the hand truck to act as a moving fulcrum along but within the extent of the frame of the truck and to require the load to be fixedly engaged onto the truck frame.
Description
~o7~48 lhis ~nyention relates generally to a hand t~uck and more particularl~ to a noyel tyRe of elevating hand truc~.
Conventionally, hand truc~s, (non~elevating hand trUcks) can bring a load to the tail of a vehicle. Unless the vehicle is provided with an expensive tail-gate elevator or the like, transfer of the load from the hand truck to the vehicle can be accomplished onl~ by manual lifting.
Similarly, when conventional hand trucks are used to carry a load up or down a flight of stairs, the hand truck carrying the load must be manhandled step b~ step up and down the stairs.
These activities are not only hazardous but require - the serYices of two men.
More advanced, prior art, hand trucks provide, in part, devices for overcoming some of the above problems as by use of belt or chain travel devices and telescoping elevator devices.
In some prior art hand trucks a belt or chain travelling device is affixed to the underside of the truck frame. This allows the truck to be moved with relatiYe ease over a flight of stairs, but where the grade between the steps is relatively large as for example an excess of about 30 centimeters, these devices become effectivel~
inoperative.
In certain other prior art elevator hand trucks, use a telescoping subframe which telescopes into the main frame of the hand truck, The sub~frame carries the load, and may be extended be~ond the main frame. As such, the load moYes relative to the main frame and a~a~ fro~ the wheels of the truck ~hich are attac~ed to the main frame~ A~te~
e~tension, the ~heels of t~e m~n fra~e can then be placed ~07~148 on a next elevated step and the sub-frame telescoped back into the main frame whereby the load is restored to the main frame while it is now at an elevated position from its point of initiation. This telescoping is usually mechanically achieved by a prime mover powering either a hydraulic cylinder or chain or screw-like mechanism, as in Canadian Patent No. 603,369 issued August 16, 1960 to Chester E. Rhodes for "An Elevator Hand Truck" (U. S. Patent No. 2,904,201 issued September 15, 1959).
A problem with elevator hand trucks such as that of Rhodes and his various improvements thereof r iS that by using a telescoping sub-frame there is migration of the load relative to the main frame. This places heavy stresses on the sub-frame and necessitates additional care in usage of the elevator hand truck, whilst with heavy or awkward loads there is the need for at least two lateral strap belts to hold the load adequately on the moving telescopic sub-frame.
I have developed an elevating hand truck which preserves during use a fixed relation between a load and the main frame yet allows relative migration of the wheels relative to the load so that the truck may operate on the load with relative ease. This is achieved by requiring the wheels of the hand truck to act as a fulcrum movable with respect to the frame of the truck. The load is fixedly maintained relative to the frame, no attachment is necessary or desirable between the load and the sub-frame, and stresses on the sub-frame are greatly reduced.
Accordingly the invention provides an elevating hand truck for carrying a load over a smooth running surface or between stepped elevations comprising: a rigid main frame defining two fixed ends and an article supporting surface therebetween, said frame having an article supporting ledge carried by one of the fixed ends with handle means on the ~ . .
~ -3-~07~48 other end, a sub-frame telescopically movable within the main frame, a set of wheels secured to the under portion of one end of the sub-frame to form a trolley, said trolley adapted to travel between the article supporting ledge and said handle of the main frame towards and away from said article supporting ledge, power means for moving the trolley along and within said main frame, said trolley acting as a movable fulcrum with res-pect to the main frame, said power means placing the trolley at any predetermined point relative to the main frame.
Further features of the invention will become apparent from the following description of embodiments of the invention and of the prior art with reference to the accompanying drawings, in which:
Figures 1 through 4 are somewhat schematic views to illustrate the method by ~hich a load-is transferred along a stair case utilizing an elevating hand truck embodying the -~
invention.
Figures 5 and 6 illustrate somewhat schematically the utilization of the invention for elevating a load onto a truck or lorry.
Figures 7 through 10 are somewhat schematic views to illustrate the prior art method by which a load is transferred `~
along a stair case.
Figures 11 and 12 illustrate somewhat schematically the prior art means (elevator hand truck) employed to elevate a load onto a lorry.
Figure 13 is a view in elevation (front view) of an elevating hand truck according to the preferred embodiments of the invention.
Pigure 14 is a sectional side view along lines XIV-XIV
of the elevating hand truck of Figure 13.
Figure 15 is a sectional view along lines XV-XV of Figure 13.
Figure 16 is a side view of an alternative embodiment of the invention.
Figure 17 is a sectional view along lines XVII-XVII
of Figure 16.
Referring now to Figure 13, the elevating hand truck 20 is composed of a main frame 21 having at its lower end an article supporting ledge 22 extending forwardly from said frame. A trolley sub-frame 23 carries a transverse axle 24 onto which truck running wheels 25 are mounted. The trolley sub-frame 23 is driven to travel along the main frame 21 in the following manner. A load screw 26 extends from the upper portion of the frame, where it is terminated at a.bearing 27, to a prime mover 28 located at the other end of the frame. The prime mover 28 preferably is a reverslble electric motor. Along each of the linear margins of the frame 21 is a race 30. Within these races the sub~frame 23 travels in registry due to fore and aft wheel arrangements 31. Each arrangement includes a transverse axle 32 which terminates with race `running wheels 33. A
ball nut 3~ is affixed to the trolley sub~frame via an - 5 --~
107~48 upper cross member 36 and depending thrust plate 37'.
Rotation of the load screw 26'bears on the ball nut 34 and translates' into relative'movement of the trolley sub~frame 23 relative to the main frame'21. This effectively locates the truck axle 24 ~which acts as the fulcrum to the load) and hence the truck running wheels 25 anywhere along the frame 21. Referring to figures 14 and 15 the axle 24 extends through lateral support members 29 depending from and attached to the trolley 23.
A power pack 38, for example batteries, are located `
near the top segment of the frame and from the power pack through suitable control means, not shown, the prime mover is activated to rotate in either direction.
The frame 21 may be provided with slits 39 which act as handles. Alternatively, U-shaped handle bar 46 is affixed directly to the trolley 23 (see figure 13) via a pair of bolts 47.
A friction brake 40 is mounted on a lower cross member 41 of the main frame. (The prime mover 28 is also affixed to this lower cross member 41 but extends between it and the inside face of the prolongation of the lifting ledge 22). The friction brake 40 consists of an adjustable belt 42 which partially circumscribes a drum 43 coaxially affixed to the screw 26 near the union of the screl~ with the rotating axis of the prime mover 28. The belt 42 terminates at one end onto a gusset 45 mounted on the cross member 41 on the one hand, and over a fasteni,ng bolt under a wing nut 44. ~len the wing nut 44 is turned down on the bolt, the relative frictional relationship between the drum 43 and the belt 42 is increased and an,enhanced brea~ing friction Oll the'screw 26 is created at all times ~ 6 _ r . ' ' '' :: , ., , ~
107~148 wllether the prime mover 28 is in operation or not. The prime mover 28 is such that it is of sufficient power to overcome the brake friction and allows the trolley 23 to move back and forth along the frame 21. This friction brake mechnism 40 assures that when the trolley is located in an elevated position and a large load is on the support ledge 22, that the screw 26 will not really turn, as when there is no power on the prime mover, and thus allow the load to migrate.
In another embodiment, figure 16, the handle 46 is affixed directly to the trolley 23 as by welding. The trolley has only a fore assembly 32, the aft being omitted.
The main frame is provided, at its margins near its upper extend, with a pair of idler wheels 49. The lateral margins of the handle 46 are U shaped in section and extend outwaTd with each of the idler wheels 49. In this manner the trolley 23 is held relatively stable in the frame 21 and a constant distance is maintained, irrespective of the location of the trolley vis a vis the frame, between the wheels 25 and the grip portion 48 of the handle 4~.
In operation, referring to figures 1 through 4, the elevating hand truck 20 carrying a load which rests on the article support ledge 22 is placed at the bottom of a flight of staris. It is tipped into the dotted postion of figure 1 and the prime mover 28 activated to migrate the trolley 23 into an essjentially midway position on the main frame 21. Tlle truck is tipped forward so that the wheels 25 rest on the second from the bottom step as in figure 2. The p~ime mover is reversed and the trolley 23 migrates towards the article support ledge 22.
This effectively lifts the load off the ground. ~hen the - 7 ~
. .~, ~ .
~071~4~
trolley 23 has been returned to about 1/2 its w~y from the base of the article support ledge 22 the load will have effectively migrated into elevation relative the first step, figure 3. The truck is then tilted back, figure 4, and the procedure repeated step by step until the load has climbed the flight of stairs.
By reversing the procedure the load can be moved down a flight of stairs.
Referring to figures 5 and 6 in a similar procedure as that described above, the load may be moved from ground onto the van as at figure 6.
Referring to the prior art, an elevator hand truck 120 is shown in figure 7 through 12, Figure 7 through 9 correspond, for the prior art elevation hand truck 120, to those of figures 1 through 4 for the embodiments. On careful comparison of figures 2 with 8; 3 with 10; and 4 with 9, it will be noted that the truck wheels 125 of the prior art device are rigidly affixed to the outside frame 121 of ~he prior art device; and tllat the telescoping sub-frame 121 carries the article support ledge 122 and also the load. Hence, the load 143 moves relative to the main frame.
,
Conventionally, hand truc~s, (non~elevating hand trUcks) can bring a load to the tail of a vehicle. Unless the vehicle is provided with an expensive tail-gate elevator or the like, transfer of the load from the hand truck to the vehicle can be accomplished onl~ by manual lifting.
Similarly, when conventional hand trucks are used to carry a load up or down a flight of stairs, the hand truck carrying the load must be manhandled step b~ step up and down the stairs.
These activities are not only hazardous but require - the serYices of two men.
More advanced, prior art, hand trucks provide, in part, devices for overcoming some of the above problems as by use of belt or chain travel devices and telescoping elevator devices.
In some prior art hand trucks a belt or chain travelling device is affixed to the underside of the truck frame. This allows the truck to be moved with relatiYe ease over a flight of stairs, but where the grade between the steps is relatively large as for example an excess of about 30 centimeters, these devices become effectivel~
inoperative.
In certain other prior art elevator hand trucks, use a telescoping subframe which telescopes into the main frame of the hand truck, The sub~frame carries the load, and may be extended be~ond the main frame. As such, the load moYes relative to the main frame and a~a~ fro~ the wheels of the truck ~hich are attac~ed to the main frame~ A~te~
e~tension, the ~heels of t~e m~n fra~e can then be placed ~07~148 on a next elevated step and the sub-frame telescoped back into the main frame whereby the load is restored to the main frame while it is now at an elevated position from its point of initiation. This telescoping is usually mechanically achieved by a prime mover powering either a hydraulic cylinder or chain or screw-like mechanism, as in Canadian Patent No. 603,369 issued August 16, 1960 to Chester E. Rhodes for "An Elevator Hand Truck" (U. S. Patent No. 2,904,201 issued September 15, 1959).
A problem with elevator hand trucks such as that of Rhodes and his various improvements thereof r iS that by using a telescoping sub-frame there is migration of the load relative to the main frame. This places heavy stresses on the sub-frame and necessitates additional care in usage of the elevator hand truck, whilst with heavy or awkward loads there is the need for at least two lateral strap belts to hold the load adequately on the moving telescopic sub-frame.
I have developed an elevating hand truck which preserves during use a fixed relation between a load and the main frame yet allows relative migration of the wheels relative to the load so that the truck may operate on the load with relative ease. This is achieved by requiring the wheels of the hand truck to act as a fulcrum movable with respect to the frame of the truck. The load is fixedly maintained relative to the frame, no attachment is necessary or desirable between the load and the sub-frame, and stresses on the sub-frame are greatly reduced.
Accordingly the invention provides an elevating hand truck for carrying a load over a smooth running surface or between stepped elevations comprising: a rigid main frame defining two fixed ends and an article supporting surface therebetween, said frame having an article supporting ledge carried by one of the fixed ends with handle means on the ~ . .
~ -3-~07~48 other end, a sub-frame telescopically movable within the main frame, a set of wheels secured to the under portion of one end of the sub-frame to form a trolley, said trolley adapted to travel between the article supporting ledge and said handle of the main frame towards and away from said article supporting ledge, power means for moving the trolley along and within said main frame, said trolley acting as a movable fulcrum with res-pect to the main frame, said power means placing the trolley at any predetermined point relative to the main frame.
Further features of the invention will become apparent from the following description of embodiments of the invention and of the prior art with reference to the accompanying drawings, in which:
Figures 1 through 4 are somewhat schematic views to illustrate the method by ~hich a load-is transferred along a stair case utilizing an elevating hand truck embodying the -~
invention.
Figures 5 and 6 illustrate somewhat schematically the utilization of the invention for elevating a load onto a truck or lorry.
Figures 7 through 10 are somewhat schematic views to illustrate the prior art method by which a load is transferred `~
along a stair case.
Figures 11 and 12 illustrate somewhat schematically the prior art means (elevator hand truck) employed to elevate a load onto a lorry.
Figure 13 is a view in elevation (front view) of an elevating hand truck according to the preferred embodiments of the invention.
Pigure 14 is a sectional side view along lines XIV-XIV
of the elevating hand truck of Figure 13.
Figure 15 is a sectional view along lines XV-XV of Figure 13.
Figure 16 is a side view of an alternative embodiment of the invention.
Figure 17 is a sectional view along lines XVII-XVII
of Figure 16.
Referring now to Figure 13, the elevating hand truck 20 is composed of a main frame 21 having at its lower end an article supporting ledge 22 extending forwardly from said frame. A trolley sub-frame 23 carries a transverse axle 24 onto which truck running wheels 25 are mounted. The trolley sub-frame 23 is driven to travel along the main frame 21 in the following manner. A load screw 26 extends from the upper portion of the frame, where it is terminated at a.bearing 27, to a prime mover 28 located at the other end of the frame. The prime mover 28 preferably is a reverslble electric motor. Along each of the linear margins of the frame 21 is a race 30. Within these races the sub~frame 23 travels in registry due to fore and aft wheel arrangements 31. Each arrangement includes a transverse axle 32 which terminates with race `running wheels 33. A
ball nut 3~ is affixed to the trolley sub~frame via an - 5 --~
107~48 upper cross member 36 and depending thrust plate 37'.
Rotation of the load screw 26'bears on the ball nut 34 and translates' into relative'movement of the trolley sub~frame 23 relative to the main frame'21. This effectively locates the truck axle 24 ~which acts as the fulcrum to the load) and hence the truck running wheels 25 anywhere along the frame 21. Referring to figures 14 and 15 the axle 24 extends through lateral support members 29 depending from and attached to the trolley 23.
A power pack 38, for example batteries, are located `
near the top segment of the frame and from the power pack through suitable control means, not shown, the prime mover is activated to rotate in either direction.
The frame 21 may be provided with slits 39 which act as handles. Alternatively, U-shaped handle bar 46 is affixed directly to the trolley 23 (see figure 13) via a pair of bolts 47.
A friction brake 40 is mounted on a lower cross member 41 of the main frame. (The prime mover 28 is also affixed to this lower cross member 41 but extends between it and the inside face of the prolongation of the lifting ledge 22). The friction brake 40 consists of an adjustable belt 42 which partially circumscribes a drum 43 coaxially affixed to the screw 26 near the union of the screl~ with the rotating axis of the prime mover 28. The belt 42 terminates at one end onto a gusset 45 mounted on the cross member 41 on the one hand, and over a fasteni,ng bolt under a wing nut 44. ~len the wing nut 44 is turned down on the bolt, the relative frictional relationship between the drum 43 and the belt 42 is increased and an,enhanced brea~ing friction Oll the'screw 26 is created at all times ~ 6 _ r . ' ' '' :: , ., , ~
107~148 wllether the prime mover 28 is in operation or not. The prime mover 28 is such that it is of sufficient power to overcome the brake friction and allows the trolley 23 to move back and forth along the frame 21. This friction brake mechnism 40 assures that when the trolley is located in an elevated position and a large load is on the support ledge 22, that the screw 26 will not really turn, as when there is no power on the prime mover, and thus allow the load to migrate.
In another embodiment, figure 16, the handle 46 is affixed directly to the trolley 23 as by welding. The trolley has only a fore assembly 32, the aft being omitted.
The main frame is provided, at its margins near its upper extend, with a pair of idler wheels 49. The lateral margins of the handle 46 are U shaped in section and extend outwaTd with each of the idler wheels 49. In this manner the trolley 23 is held relatively stable in the frame 21 and a constant distance is maintained, irrespective of the location of the trolley vis a vis the frame, between the wheels 25 and the grip portion 48 of the handle 4~.
In operation, referring to figures 1 through 4, the elevating hand truck 20 carrying a load which rests on the article support ledge 22 is placed at the bottom of a flight of staris. It is tipped into the dotted postion of figure 1 and the prime mover 28 activated to migrate the trolley 23 into an essjentially midway position on the main frame 21. Tlle truck is tipped forward so that the wheels 25 rest on the second from the bottom step as in figure 2. The p~ime mover is reversed and the trolley 23 migrates towards the article support ledge 22.
This effectively lifts the load off the ground. ~hen the - 7 ~
. .~, ~ .
~071~4~
trolley 23 has been returned to about 1/2 its w~y from the base of the article support ledge 22 the load will have effectively migrated into elevation relative the first step, figure 3. The truck is then tilted back, figure 4, and the procedure repeated step by step until the load has climbed the flight of stairs.
By reversing the procedure the load can be moved down a flight of stairs.
Referring to figures 5 and 6 in a similar procedure as that described above, the load may be moved from ground onto the van as at figure 6.
Referring to the prior art, an elevator hand truck 120 is shown in figure 7 through 12, Figure 7 through 9 correspond, for the prior art elevation hand truck 120, to those of figures 1 through 4 for the embodiments. On careful comparison of figures 2 with 8; 3 with 10; and 4 with 9, it will be noted that the truck wheels 125 of the prior art device are rigidly affixed to the outside frame 121 of ~he prior art device; and tllat the telescoping sub-frame 121 carries the article support ledge 122 and also the load. Hence, the load 143 moves relative to the main frame.
,
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An elevating hand truck for carrying a load over a smooth running surface or between stepped elevations, compri-sing: a rigid main frame defining two fixed ends and an article supporting surface therebetween, said frame having an article supporting ledge carried by one of the fixed ends with handle means on the other end, a sub-frame telescopically movable within the main frame, a set of wheels secured to the under portion of one end of the sub-frame to form a trolley, said trolley adapted to travel between the article supporting ledge and said handle of the main frame towards and away from said article supporting ledge, power means for moving the trolley along and within said main frame, said trolley acting as a movable fulcrum with respect to the main frame, said power means placing the trolley at any predetermined point relative to the main frame.
2. The hand truck as claimed in Claim 1, wherein the power means for moving the trolley includes a rotatable screw extending between the fixed ends, a nut through which the screw extends, the nut being affixed to the trolley, and a reversible prime mover in driving connection with the screw, whereby rotation of the screw in either direction by the prime mover travels the trolley along the frame toward or away from said article supporting ledge.
3. The hand truck as claimed in Claim 2, further including means frictionally engaging the screw to prevent free rotation of the latter.
4. The hand truck as claimed in Claim 3, wherein the means engaging the screw does so with an adjustable degree of friction.
5. The hand truck as claimed in Claim 1, 2 or 3, wherein an auxiliary handle means is provided which extends beyond the frame, said auxiliary handle means being fixedly attached to the trolley and hence relatively movable with the trolley with respect to the article supporting ledge.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA262,077A CA1071148A (en) | 1976-09-27 | 1976-09-27 | Hand truck |
| GB3897777A GB1591116A (en) | 1976-09-27 | 1977-09-19 | Elevating hand truck |
| NL7710378A NL7710378A (en) | 1976-09-27 | 1977-09-22 | HAND CART. |
| DE19777729766 DE7729766U1 (en) | 1976-09-27 | 1977-09-26 | LIFT TRUCK WITH CLIMBING DEVICE |
| DE19772743214 DE2743214A1 (en) | 1976-09-27 | 1977-09-26 | LIFT TRUCK WITH CLIMBING DEVICE |
| FR7729085A FR2365514A1 (en) | 1976-09-27 | 1977-09-27 | MOTOR-DRIVEN LIFT TRUCK EQUIPPED WITH A CONVEYOR DEVICE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA262,077A CA1071148A (en) | 1976-09-27 | 1976-09-27 | Hand truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1071148A true CA1071148A (en) | 1980-02-05 |
Family
ID=4106940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA262,077A Expired CA1071148A (en) | 1976-09-27 | 1976-09-27 | Hand truck |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1071148A (en) |
-
1976
- 1976-09-27 CA CA262,077A patent/CA1071148A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |