US3724864A - Crawler type load transporting device - Google Patents
Crawler type load transporting device Download PDFInfo
- Publication number
- US3724864A US3724864A US00211188A US3724864DA US3724864A US 3724864 A US3724864 A US 3724864A US 00211188 A US00211188 A US 00211188A US 3724864D A US3724864D A US 3724864DA US 3724864 A US3724864 A US 3724864A
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- United States
- Prior art keywords
- members
- secured
- sprocket
- shaft
- driving shaft
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- Expired - Lifetime
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- 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
Definitions
- ABSTRACT A combination hand truck and a manual or power driven propulsion unit including means for removably securing the propulsion unit to the body of the hand truck.
- the hand truck is of conventional type wherein the body is preferably, though not restrictively, made of metal tubing or the like, supported by two forward ground-engaging wheels.
- the present invention relates to improvements in hand trucks and in particular to a type of hand truck used for conveying heavy loads such as appliances and the like up and over inclined irregular surfaces such as flights of stairs, curbings and the like.
- a propulsion unit in the form of a base structure adapted for ready securement to or removal from the body of a conventional hand truck and wherein said base structure comprises downwardly opening parallel channel members with elongated bars or plates, sometimes hereinafter referred to as walking beams, mounted within the channel members for independent reciprocal motion relative to each other.
- FIG. 1 is a perspective view of a hand truck combined with a traction unit made in accordance with my invention
- FIG. 2 is a perspective view of a bearing bracket
- FIG. 3 is a perspective view of a cam shaft showing cam members secured to the shaft near the opposite ends thereof,
- FIG. 4 is a perspective view of one of two identical inverted channel members
- FIGS. 5 and 6 are perspective views of two identical bars or plates operatively supported at both of their ends by the cam members shown in FIG. 3 and operable as walking beams with their bottom edges having the characteristics of saw teeth,
- FIG. 7 is a sectional elevational view on an enlarged scale taken approximately along the line 7-7 of FIG. 1, and
- FIG. 8 is a fragmentary view on a reduced scale illustrating in full and broken lines the progressive stepping or crawling action of the walking beams illustrated in FIG. 5 and 6 and in alternate increments of advancement in stair climbing operation.
- the hand truck frame indicated generally by numeral 1 comprises two vertically disposed side frame members indicated generally at 2 and 3 permanently secured in parallel relation to each other by transverse tubular members 4 and by a transverse load carrier 5 at its forward end and a cross plate 37 at its rearward end.
- the top and bottom rails 7 and 8 respectively of each side frame member are reinforced in their parallel relation to each other by tubular members 11.
- the forward end of the hand truck body 1 is supported in any suitable manner by ground engaging idling wheels 9.
- a traction unit indicated generally at 12 is secured at its forward end as by welding or the like to the underside of the truck body 1.
- the unit comprises two identical parallel downwardly opening channel sections 13 and 14 fixedly secured to the underside of the truck body 1 by vertical tubular members 15 and 16.
- the bottom ends of these tubular members 15-16 are similarly secured to the web 17 of the channel members 13-14.
- the forward and rearward ends of the channel members 13-14 (FIG. 4) are provided with transversely aligned forward sleeve bearings 18 and rearward sleeve bearings 19. Since both channel sections and their internal and external related parts are identical a description of the one channel section assembly will suffice for both.
- a driven shaft 20 is journaled in the transversely aligned forward sleeve bearings 18 of both channel members 13-14 and extends outwardly therefrom. Either or both of the extended ends of the shaft 20 is provided with a driven sprocket wheel 21.
- cam members 22-23 Two identical pairs of diametrically opposed cam members 22-23 are secured in any suitable manner to the forward driven shaft 20 inwardly from the ends thereof for driving rotation within identical roller bearings 24-24 at the forward end of thetwo identical walking beams 26-27 within the channel member 13.
- the other pair of cam members 22-23 are similarly functional in roller bearings (not shown) in the corresponding end of the companion channel member 14.
- the rearward driving shaft 30 is provided with a bevel gear 31 enmeshed at all times with a companion bevel gear 32 secured to the rearward end of a crankshaft 33 journaled near its rearward end in a bearing 34 extending downwardly from the cross plate 6 secured in any suitable manner to the forward end of the webs 17 of the channel members 13 and 14.
- the shaft 33 extends rearwardly through a sleeve bearing 36 dependingfrom a second cross member 37 welded or otherwise secured at its ends to the bottom rails 8 of the truck body frame 1. This end of the shaft 33 terminates in a crank handle 38.
- a sprocket chain 40 is entrained over both sprocket wheels 21 to impart rotation to the cam members 22-23 within their respective roller bearings 24-24 to thereby impart (FIG. 8) reciprocal rotary convolutions 42-43 to the walking beams 26-27 to cause intermittent progressive gripping engagement of the saw tooth bottom edges of the walking beams 26-27 with the edges of the steps 44.
- an appliance hand truck having an elongated main frame supported at its forward end by ground engaging wheels; the improvement comprising a traction unit including parallel frame members of inverted channel section,
- cam members secured to said driven and driving shafts, walking beams mounted within said channel members for reciprocal motion relative to each other,
- cam members operationally disposed within said roller, bearings
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Handcart (AREA)
Abstract
A combination hand truck and a manual or power driven propulsion unit including means for removably securing the propulsion unit to the body of the hand truck. The hand truck is of conventional type wherein the body is preferably, though not restrictively, made of metal tubing or the like, supported by two forward ground-engaging wheels.
Description
United States Patent [191 Balsbaugh 1 Apr. 3, 1973 [54] CRAWLER TYPE LOAD T RANSPORTING DEVICE [76] Inventor:
68, Dallas, Oreg. 97338 [22] Filed: Dec. 23, 1971 [2]] Appl. No.: 211,188
[52] US. Cl ..280/5.28, 180/8 A [51] Int. Cl. ..B62b 5/02 [58] Field of Search ..280/5.28, 5.22, 5.2, DIG. l0;
[56] I References Cited UNITED STATES PATENTS 2,763,489 9/1956 Marsalis ..280/5.22
Vernon L. Balsbaugh, Route 2, Box
3,l33,742 5/1964 Rlchison et al ..280/5.28
7/1964 Green ..280/5.28 X
Primary Examiner-Leo Friaglia Attorney-James D. Givnan [57] ABSTRACT A combination hand truck and a manual or power driven propulsion unit including means for removably securing the propulsion unit to the body of the hand truck. The hand truck is of conventional type wherein the body is preferably, though not restrictively, made of metal tubing or the like, supported by two forward ground-engaging wheels.
1 Claim, 8 Drawing Figures CRAWLER TYPE LOAD TRANSPORTING DEVICE The present invention relates to improvements in hand trucks and in particular to a type of hand truck used for conveying heavy loads such as appliances and the like up and over inclined irregular surfaces such as flights of stairs, curbings and the like.
The objects of the invention are:
To provide and improved hand truck of the character described which includes a propulsion unit in the form of a base structure adapted for ready securement to or removal from the body of a conventional hand truck and wherein said base structure comprises downwardly opening parallel channel members with elongated bars or plates, sometimes hereinafter referred to as walking beams, mounted within the channel members for independent reciprocal motion relative to each other.
To so form the exposed bottom edges of the blades as to simulate the general appearance and characteristics of saw-teeth so far as the shape thereof is concerned, but not the cutting action.
To provide a heavy-duty hand truck provided with a strong, durable and efficient propulsion unit which is so constructed as to present a minimum amount of friction, making possible manual operation by a single operator.
The foregoing and other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, and in which: i
FIG. 1 is a perspective view of a hand truck combined with a traction unit made in accordance with my invention,
FIG. 2 is a perspective view of a bearing bracket,
FIG. 3 is a perspective view of a cam shaft showing cam members secured to the shaft near the opposite ends thereof,
FIG. 4 is a perspective view of one of two identical inverted channel members,
FIGS. 5 and 6 are perspective views of two identical bars or plates operatively supported at both of their ends by the cam members shown in FIG. 3 and operable as walking beams with their bottom edges having the characteristics of saw teeth,
FIG. 7 is a sectional elevational view on an enlarged scale taken approximately along the line 7-7 of FIG. 1, and
FIG. 8 is a fragmentary view on a reduced scale illustrating in full and broken lines the progressive stepping or crawling action of the walking beams illustrated in FIG. 5 and 6 and in alternate increments of advancement in stair climbing operation.
With continuing reference to the drawing wherein like reference numerals indicate like parts, the hand truck frame indicated generally by numeral 1 comprises two vertically disposed side frame members indicated generally at 2 and 3 permanently secured in parallel relation to each other by transverse tubular members 4 and by a transverse load carrier 5 at its forward end and a cross plate 37 at its rearward end. The top and bottom rails 7 and 8 respectively of each side frame member are reinforced in their parallel relation to each other by tubular members 11. The forward end of the hand truck body 1 is supported in any suitable manner by ground engaging idling wheels 9.
A traction unit indicated generally at 12 is secured at its forward end as by welding or the like to the underside of the truck body 1. The unit comprises two identical parallel downwardly opening channel sections 13 and 14 fixedly secured to the underside of the truck body 1 by vertical tubular members 15 and 16. The bottom ends of these tubular members 15-16 are similarly secured to the web 17 of the channel members 13-14. The forward and rearward ends of the channel members 13-14 (FIG. 4) are provided with transversely aligned forward sleeve bearings 18 and rearward sleeve bearings 19. Since both channel sections and their internal and external related parts are identical a description of the one channel section assembly will suffice for both.
A driven shaft 20 is journaled in the transversely aligned forward sleeve bearings 18 of both channel members 13-14 and extends outwardly therefrom. Either or both of the extended ends of the shaft 20 is provided with a driven sprocket wheel 21.
Two identical pairs of diametrically opposed cam members 22-23 are secured in any suitable manner to the forward driven shaft 20 inwardly from the ends thereof for driving rotation within identical roller bearings 24-24 at the forward end of thetwo identical walking beams 26-27 within the channel member 13. On the opposite end of shaft 20 the other pair of cam members 22-23 are similarly functional in roller bearings (not shown) in the corresponding end of the companion channel member 14.
As best illustrated in FIGS. 1 and 7 the rearward driving shaft 30 is provided with a bevel gear 31 enmeshed at all times with a companion bevel gear 32 secured to the rearward end of a crankshaft 33 journaled near its rearward end in a bearing 34 extending downwardly from the cross plate 6 secured in any suitable manner to the forward end of the webs 17 of the channel members 13 and 14. The shaft 33 extends rearwardly through a sleeve bearing 36 dependingfrom a second cross member 37 welded or otherwise secured at its ends to the bottom rails 8 of the truck body frame 1. This end of the shaft 33 terminates in a crank handle 38.
A sprocket chain 40 is entrained over both sprocket wheels 21 to impart rotation to the cam members 22-23 within their respective roller bearings 24-24 to thereby impart (FIG. 8) reciprocal rotary convolutions 42-43 to the walking beams 26-27 to cause intermittent progressive gripping engagement of the saw tooth bottom edges of the walking beams 26-27 with the edges of the steps 44.
What I claim is:
1. In an appliance hand truck having an elongated main frame supported at its forward end by ground engaging wheels; the improvement comprising a traction unit including parallel frame members of inverted channel section,
bridge members interconnecting said frame members for securement to the underside of said truck main frame,
a transversely disposed driven shaft journaled through the forward end of said inverted channel members,
a transversely disposed driving shaft journaled through the rearward end of said inverted channel members,
cam members secured to said driven and driving shafts, walking beams mounted within said channel members for reciprocal motion relative to each other,
and having roller bearings near the opposite ends thereof,
said cam members operationally disposed within said roller, bearings,
at least one sprocket wheel secured to said forward driven shaft and at least one sprocket wheel secured to said driving shaft,
a sprocket chain entrained over said sprocket wheels,
a driving gear secured to said driving shaft and enmeshed at all times with a gear secured to the for-
Claims (1)
1. In an appliance hand truck having an elongated main frame supported at its forward end by ground engaging wheels; the improvement comprising a traction unit including parallel frame members of inverted channel section, bridge members interconnecting said frame members for securement to the underside of said truck main frame, a transversely disposed driven shaft journaled through the forward end of said inverted channel members, a transversely disposed driving shaft journaled through the rearward end of said inverted channel members, cam members secured to said driven and driving shafts, walking beams mounted within said channel members for reciprocal motion relative to each other and having roller bearings near the opposite ends thereof, said cam members operationally disposed within said roller bearings, at least one sprocket wheel secured to said forward driven shaft and at least one sprocket wheel secured to said driving shaft, a sprocket chain entrained over said sprocket wheels, a driving gear secured to said driving shaft and enmeshed at all times with a gear secured to the forward end of a crank shaft, said crank shaft journaled in at least one bearing depending from said traction unit and terminating in a crank handle, whereby rotary motion imparted to said driving shaft will be transmitted through said sprocket chain and said sprocket wheels to said cam members aNd through said roller bearings to said walking beams, and the bottom edge of each of said walking beams characterized by saw tooth configurations lengthwise thereof and thereby adapted for progressive step by step engagement with a stairway.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21118871A | 1971-12-23 | 1971-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3724864A true US3724864A (en) | 1973-04-03 |
Family
ID=22785904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00211188A Expired - Lifetime US3724864A (en) | 1971-12-23 | 1971-12-23 | Crawler type load transporting device |
Country Status (1)
Country | Link |
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US (1) | US3724864A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2167360A (en) * | 1984-11-20 | 1986-05-29 | Edward D W Huckell | Hand truck |
FR2648038A1 (en) * | 1989-06-13 | 1990-12-14 | Perrin Jacques | Wheelchair for handicapped persons which is equipped with means for climbing steps |
US6123162A (en) * | 1999-01-29 | 2000-09-26 | Rodriguez; Otto M. | Hand truck with detachable power unit |
US20120175850A1 (en) * | 2006-04-07 | 2012-07-12 | The University Of Hartford | Wheelchair Attachments |
US8967628B2 (en) | 2011-12-20 | 2015-03-03 | Douglas G. Sabin | Apparatus, system and method for a load-bearing cart |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2763489A (en) * | 1952-06-12 | 1956-09-18 | William I Marsalis | Hand truck provided with track type treads |
US3133742A (en) * | 1962-10-08 | 1964-05-19 | T H Conklin | Stairclimbing wheelchair |
US3142351A (en) * | 1962-01-19 | 1964-07-28 | Canadian Res | Stair climbing wheelchair |
-
1971
- 1971-12-23 US US00211188A patent/US3724864A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2763489A (en) * | 1952-06-12 | 1956-09-18 | William I Marsalis | Hand truck provided with track type treads |
US3142351A (en) * | 1962-01-19 | 1964-07-28 | Canadian Res | Stair climbing wheelchair |
US3133742A (en) * | 1962-10-08 | 1964-05-19 | T H Conklin | Stairclimbing wheelchair |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2167360A (en) * | 1984-11-20 | 1986-05-29 | Edward D W Huckell | Hand truck |
FR2648038A1 (en) * | 1989-06-13 | 1990-12-14 | Perrin Jacques | Wheelchair for handicapped persons which is equipped with means for climbing steps |
US6123162A (en) * | 1999-01-29 | 2000-09-26 | Rodriguez; Otto M. | Hand truck with detachable power unit |
US20120175850A1 (en) * | 2006-04-07 | 2012-07-12 | The University Of Hartford | Wheelchair Attachments |
US9050230B2 (en) * | 2006-04-07 | 2015-06-09 | Montefiore Medical Center | Wheelchair attachments |
US8967628B2 (en) | 2011-12-20 | 2015-03-03 | Douglas G. Sabin | Apparatus, system and method for a load-bearing cart |
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