US3217836A - Load platform safety mechanism actuated by load - Google Patents

Load platform safety mechanism actuated by load Download PDF

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Publication number
US3217836A
US3217836A US195475A US19547562A US3217836A US 3217836 A US3217836 A US 3217836A US 195475 A US195475 A US 195475A US 19547562 A US19547562 A US 19547562A US 3217836 A US3217836 A US 3217836A
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US
United States
Prior art keywords
load
platform
plunger
safety mechanism
rails
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Expired - Lifetime
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US195475A
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English (en)
Inventor
Darimont Maurice
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Individual
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Individual
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Publication of US3217836A publication Critical patent/US3217836A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • 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

Definitions

  • the present invention relates to a two-wheel small truck in the form of a hand truck specially designed to lift a weight placed on a platform fixed at the end of a mobile element, sliding on the rails of a metallic structure through the action of a pulling power operated at the other end, and consisting of a first element with a foot lever which runs along the rails of a second element also fitted with a foot lever which in turn slides along the rails welded to the metallic structure.
  • each foot lever When acting on each foot lever in turn the platform is brought to the lower end of the rails, which at this spot are provided with casings into which ball bearings are to be lodged. As soon as the load is removed from the platform the operator may disengage the ball bearings from their housings by means of the foot levers so as to bring the platform to the ground level to receive a new load.
  • the present improvement eliminates the above mentioned action, thus bringing back the platform to ground level automatically as soon as the load is removed from it at the desired height.
  • the platform thus may move down to ground level as soon as the load is removed.
  • the platform consists of a rigid frame sliding along rails bearing on arms hanging freely, placed at the inner sides, and supporting a tray for the load.
  • This load through the action of springs, displaces a plunger and brings same into a position to permit one of its ends to contact successively two stops welded to the metallic structure at levels respectively slightly lower than the two levels attained by the platform, by the action of the two foot levers, so as to prevent the platform from falling down until the load is removed and the springs force back the plunger into its housing.
  • the ball bearing housings thus become inoperative.
  • a liner is fixed to part of the frame having a passage for the plunger.
  • Said liner contains the above said plunger, circled by two helicoidal springs, one of which acts on one side against the bottom of the liner, whereas the other spring acts against a lobe on the plunger.
  • both springs act against a washer fixed by the fiat head of the plunger, housed in the respective barrel.
  • the barrel containing the plungers flat head contacts said part of the frame, whereas the other end of the plunger can enter into contact with the stops which can be formed, for instance, by bars inclined for the purpose.
  • FIG. 1 is an end elevation showing part of the projection of the platform.
  • FIG. 2 is a side elevation partly in section, taken on line II-II of FIG. 1 in the direction of the arrows;
  • FIG. 3 is a section of a detail.
  • the machine to lift a load is mainly composed of a structure on wheels sliding 3,217,336 Patented Nov. 16, 1965 on the rails of two elements each equipped with a foot lever to be acted upon so as to pull a cable attached to the platform which also slides on rails.
  • the platform comprises a frame 1 the sides 1a of which are equipped with rollers 1b rolling on rails 2. Within these sides 1a are fitted two arms 3, swinging on pivots 3a, fixed on a bar 3b, and ending in a platform 30 on which the load is to be placed.
  • a horizontal element 4 At the lower part of frame 1 there is a horizontal element 4, in the middle of which is provided a hole 4a. Said hole is fitted with a liner 5, having a plunger 6 therein encircled by two springs 7 and 8.
  • Springs 7 acts at one end on element 4 (bottom of liner) and at the other end on washer 9 whose outward movement is limited by by the fiat head 6a of plunger 6.
  • the other spring 8 is fixed between the shoulder 6b of the plunger and washer 9, the latter aflixed to a barrel 10 which comes into contact with element 3b.
  • the stops 11 are placed at levels respectively slightly lower than the two respective levels attained by the platform through the action of foot levers (not shown).
  • a load platform safety mechanism actuated by a load for a hand truck comprising a pair of spaced rails, a pair of frame members slidably mounted on the rails, the pair of arms each pivotally mounted at its upper end on a frame member, a platform having a bar member secured to the lower ends of the arms, a member secured to the lower part of the frame members and having a hole therein, a plunger operative with the platform and projecting into the hole, a spring biasing the plunger into engagement with the bar member to pivot the platform to a first position, the placing of a load on the platform pivoting the platform to a second position to project the plunger out of its hole, and a stop having a cam surface mounted on the rails in the path of movement of the projected plunger so that the latter will slide on the cam surface and over the stop to prevent the platform from falling with the load thereon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Handcart (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)
US195475A 1961-05-29 1962-05-17 Load platform safety mechanism actuated by load Expired - Lifetime US3217836A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE604352A BE604352R (fr) 1961-05-29 1961-05-29 Diable ou chariot pour le transport et le levage d'un fardeau

Publications (1)

Publication Number Publication Date
US3217836A true US3217836A (en) 1965-11-16

Family

ID=3845262

Family Applications (1)

Application Number Title Priority Date Filing Date
US195475A Expired - Lifetime US3217836A (en) 1961-05-29 1962-05-17 Load platform safety mechanism actuated by load

Country Status (3)

Country Link
US (1) US3217836A (fr)
BE (1) BE604352R (fr)
ES (1) ES277684A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940381A (en) * 1988-08-26 1990-07-10 American Telephone And Telegraph Company Mobile hoist

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3058407B1 (fr) * 2016-11-09 2020-11-06 Excent France Base mobile et procede de transport d'un equipement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751644A (en) * 1928-07-03 1930-03-25 Alexander W Mckenzie Automatic locking elevator
US2482211A (en) * 1942-12-21 1949-09-20 Reichardt Hendricus Cornelis Lifting apparatus
US2639150A (en) * 1947-12-15 1953-05-19 Southworth Machine Co Skid lift
US2856028A (en) * 1953-06-22 1958-10-14 Dover Corp Automatic locking device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751644A (en) * 1928-07-03 1930-03-25 Alexander W Mckenzie Automatic locking elevator
US2482211A (en) * 1942-12-21 1949-09-20 Reichardt Hendricus Cornelis Lifting apparatus
US2639150A (en) * 1947-12-15 1953-05-19 Southworth Machine Co Skid lift
US2856028A (en) * 1953-06-22 1958-10-14 Dover Corp Automatic locking device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940381A (en) * 1988-08-26 1990-07-10 American Telephone And Telegraph Company Mobile hoist

Also Published As

Publication number Publication date
BE604352R (fr) 1961-09-18
ES277684A1 (es) 1962-10-01

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