US1743542A - Lift truck - Google Patents

Lift truck Download PDF

Info

Publication number
US1743542A
US1743542A US165946A US16594627A US1743542A US 1743542 A US1743542 A US 1743542A US 165946 A US165946 A US 165946A US 16594627 A US16594627 A US 16594627A US 1743542 A US1743542 A US 1743542A
Authority
US
United States
Prior art keywords
levers
bell
arms
lifting device
platform
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 - Lifetime
Application number
US165946A
Inventor
Groenke Paul
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundmann & Kuhn
Original Assignee
Grundmann & Kuhn
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Grundmann & Kuhn filed Critical Grundmann & Kuhn
Application granted granted Critical
Publication of US1743542A publication Critical patent/US1743542A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
    • B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
    • B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
    • B62B3/0625—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground using rigid mechanical lifting mechanisms, e.g. levers, cams or gears
    • B62B3/0631—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground using rigid mechanical lifting mechanisms, e.g. levers, cams or gears with a parallelogram linkage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
    • B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
    • B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
    • B62B3/0625—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground using rigid mechanical lifting mechanisms, e.g. levers, cams or gears

Definitions

  • BERLIN, GERMANY LIFT- TRUCK My invention relates to a truck having a stationary frame properly mounted on and supported by the axles, and a platform adapted to be raised and lowered, with relation to the said frame, by means of a sys- 1 tem of levers arranged and adapted to impart to the said platform a parallel lifting motion.
  • the object of my invention is to provide a truck of the character above indicated in which a hydraulic lifting device is employed for the purpose of raising and lowering the platform on the parallel guide principle, and which is extremely compact and simple in construction, efficient and reliable in opera, 16 tion, strong and durable, and which has important distinguishing characteristics of its own such as a system of interconnected bellcrank levers and a mechanism for imparting motion to the levers through the hydraulic 20 lifting device for the purpose in view.
  • a hydraulic lifting device having a reciprocable piston and a system of preferably three pairs of bell-crank levers pivotally interconnected by rods or link with certain of the bell-crank levers pivotally connected to suitable supports carrying the platform, and I pivotally connect one pair of the said bell-crank levers with the said piston by means of suitable members for the purpose in view.
  • Figure 1 is a side elevation showing my 165,946, and in Germany February 16, 1928.
  • Figure 2 is a similar view showing the platform in its raised position
  • Figure 3 illustrates, in side elevation, the hydraulic lifting device and the members employed for connectin the piston thereof with the one pair of be l-crank levers
  • Figure 4 is. a front view of the said lifting device
  • the hydraulic lifting device i is located at the front end of the truck.
  • the piston is of the lifting device is of the two stepped or bipartite type, but it may be of any other conventional construction since no claim is made to the particular construction thereof with the sole exception that the upper or free end of the piston is provided with a suitable transverse member such as a bridle Z, as shown, serving 90, as a means for the necessary connection with the bell-crank lever system.
  • two bellcrank levers m are fulcrumed on a transverse shaft or rod duly supported on the frame of 96 i the truck in 'the vicinity of the lifting device 2', and the front arms of the levers m are ivotally connected with the two arms of the hridle Z by means of slots or the like so that when the piston moves upwards, in conse- 100 quence of the action of the pumps 2" operated by the lever 11, the bridle Z will have the necessary liberty of connection.
  • the hind arms of the two levers m are interconnected by a transverse shaft or rod n and the latter is pivotally connected with the shaft or rod 9 interconnecting the two arms of the front pair of bell-crank levers f, as will be clearly seen in Figures 1 and 2, the means emplo ed for thus connecting the two rods or sha ts n and g, being, in the embodiment shown, a pair of links 0.
  • a lift truck comprising fixed and movable platforms, the combination therewith of two pairs of bell-crank levers, each pair of levers pivoted at its fulcrum point to one of the platforms and at the ends of one of the lever arms to the other of said platforms, two rods connectingthe ends of the other arms of the bell-crank levers to each other, a hydraulic lifting device mounted vertically on the fixed platform and having a movable piston, a third pair of bell-crank levers pivoted to fulcrum on said fixed platform, the forward ends of the third pair of bell-crank levers being connected by a bridle to the movable piston and the rear ends of the third pair of bell-crank levers being connected by links to those arms of one .of the first mentioned pairs of bell-crank levers, which are interconnected by said rods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Description

Jan. 14, "1930.
P. GROENKE LIFT TRUCK Filed Feb. "4, 1927 Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE PAUL GROENKE, OF BERLIN, GERMANY, ASSIGNOR TO GRUNDMANN & KUHN, OI
BERLIN, GERMANY LIFT- TRUCK My invention relates to a truck having a stationary frame properly mounted on and supported by the axles, and a platform adapted to be raised and lowered, with relation to the said frame, by means of a sys- 1 tem of levers arranged and adapted to impart to the said platform a parallel lifting motion.
The object of my invention is to provide a truck of the character above indicated in which a hydraulic lifting device is employed for the purpose of raising and lowering the platform on the parallel guide principle, and which is extremely compact and simple in construction, efficient and reliable in opera, 16 tion, strong and durable, and which has important distinguishing characteristics of its own such as a system of interconnected bellcrank levers and a mechanism for imparting motion to the levers through the hydraulic 20 lifting device for the purpose in view.
According to the present'invention I provide on the frame of the truck a hydraulic lifting device having a reciprocable piston and a system of preferably three pairs of bell-crank levers pivotally interconnected by rods or link with certain of the bell-crank levers pivotally connected to suitable supports carrying the platform, and I pivotally connect one pair of the said bell-crank levers with the said piston by means of suitable members for the purpose in view.
Before proceeding to describe the construction which I have selected as best embodying my invention, I desire to have it understood that said construction is not the only embodiment of which the invention is capable, that a wide range of equivalents may be employed for the arts which I will show and describe hereinafter, and that the nhraseology which I have adopted, is for the purposeof description and not of limitation except where the sense absolutely requires it.
In the accompanying drawings forming a part of this specification, and showing for purposes of exemplification, a preferred form and manner in which the invention may be embodied and practised but without limiting the claimed invention to such illustrative instance:
Figure 1 is a side elevation showing my 165,946, and in Germany February 16, 1928.
invention as applied to a four-wheel truck or wagon and with the platform thereon in. its lowered position; Figure 2 is a similar view showing the platform in its raised position; Figure 3 illustrates, in side elevation, the hydraulic lifting device and the members employed for connectin the piston thereof with the one pair of be l-crank levers; and Figure 4 is. a front view of the said lifting device,
Where desirable the same reference symbolsare used in the different figures to denote corresponding parts.
In reducing my invention to practice I rovide in the frame d two transverse sha s e for the bell-crank levers 7", two such levers being mounted on each shaft, preferably near the ends thereof and adapted to rock or swing thereabout or therewith. Corresponding arms of the levers f are pivotally connected with each other in pairs by transverse rods or shafts g and the two shafts g of the system are interconnected by rods 7 in the manner of a parallel guide. The other arms of the four levers f are pivotally connected by means of transverse rods 0 or the like, with the ends of arms Z) fixed to the bottom face of the platform a so as to depend therefrom, and acting to support the same in both the lowered and the raised position.
In the embodiment shown the hydraulic lifting device i is located at the front end of the truck. The piston is of the lifting device is of the two stepped or bipartite type, but it may be of any other conventional construction since no claim is made to the particular construction thereof with the sole exception that the upper or free end of the piston is provided with a suitable transverse member such as a bridle Z, as shown, serving 90, as a means for the necessary connection with the bell-crank lever system.
As will be seen in Figures 1 and 2 two bellcrank levers m are fulcrumed on a transverse shaft or rod duly supported on the frame of 96 i the truck in 'the vicinity of the lifting device 2', and the front arms of the levers m are ivotally connected with the two arms of the hridle Z by means of slots or the like so that when the piston moves upwards, in conse- 100 quence of the action of the pumps 2" operated by the lever 11, the bridle Z will have the necessary liberty of connection. The hind arms of the two levers m are interconnected by a transverse shaft or rod n and the latter is pivotally connected with the shaft or rod 9 interconnecting the two arms of the front pair of bell-crank levers f, as will be clearly seen in Figures 1 and 2, the means emplo ed for thus connecting the two rods or sha ts n and g, being, in the embodiment shown, a pair of links 0.
It does not seem necessary to explain in detail the operation of the described mechanism, it is rather believed that it will be sufficient to state that, upon actuation of the lifting device 1', the rising piston thereof will cause, through the agency of the described lever system, the platform to rise from the down position shown in Figure 1 to the up position illustrated in Figure 2, and vice versa when the piston is allowed to go down.
What I claim is In a lift truck comprising fixed and movable platforms, the combination therewith of two pairs of bell-crank levers, each pair of levers pivoted at its fulcrum point to one of the platforms and at the ends of one of the lever arms to the other of said platforms, two rods connectingthe ends of the other arms of the bell-crank levers to each other, a hydraulic lifting device mounted vertically on the fixed platform and having a movable piston, a third pair of bell-crank levers pivoted to fulcrum on said fixed platform, the forward ends of the third pair of bell-crank levers being connected by a bridle to the movable piston and the rear ends of the third pair of bell-crank levers being connected by links to those arms of one .of the first mentioned pairs of bell-crank levers, which are interconnected by said rods.
In testimony whereof PAUL GROE
US165946A 1926-02-16 1927-02-04 Lift truck Expired - Lifetime US1743542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1743542X 1926-02-16

Publications (1)

Publication Number Publication Date
US1743542A true US1743542A (en) 1930-01-14

Family

ID=7741457

Family Applications (1)

Application Number Title Priority Date Filing Date
US165946A Expired - Lifetime US1743542A (en) 1926-02-16 1927-02-04 Lift truck

Country Status (1)

Country Link
US (1) US1743542A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725998A (en) * 1951-11-28 1955-12-06 Sireno E Huff Truck wheel dollies
US3348893A (en) * 1965-10-11 1967-10-24 Hamilton Mfg Co Physician's examining table
US4600171A (en) * 1984-10-12 1986-07-15 Lockheed Corporation Aircraft stores vertical extension and retraction system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725998A (en) * 1951-11-28 1955-12-06 Sireno E Huff Truck wheel dollies
US3348893A (en) * 1965-10-11 1967-10-24 Hamilton Mfg Co Physician's examining table
US4600171A (en) * 1984-10-12 1986-07-15 Lockheed Corporation Aircraft stores vertical extension and retraction system

Similar Documents

Publication Publication Date Title
US2533980A (en) Lifting and lowering appliance
US2234925A (en) Elevating truck for pallets and the like
US2608315A (en) Industrial truck
US1743542A (en) Lift truck
US2099903A (en) Lifting apparatus
US2476380A (en) Lifting mechanism
US2203059A (en) Body elevating mechanism for dumping wagons or the like
US3065871A (en) Self elevating fork lift truck trailer
US2542258A (en) Pedal lift gate
US1453376A (en) Scale-platform lifting mechanism
US1391773A (en) Combined truck and jack
US1383669A (en) Elevating-truck
US1885112A (en) Handtruck
US2355328A (en) Spring cushioned lift truck
US2439781A (en) Hand lift truck
US1620744A (en) Motor vehicle
US1660517A (en) Truck
US2292882A (en) Hinged reach yarder
US2292878A (en) Sliding reach yarder
US1878726A (en) Lift truck
US2913133A (en) Loader
US1430992A (en) Lifting truck
US2061954A (en) Rice wagon
US1380677A (en) Lift for gin-breasts
US1365888A (en) Automobile-jack