JPH081277Y2 - Luggage lift - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is directed to a telescopic boom having a base end portion rotatably connected to a revolving base mounted on a vehicle so as to pivot, and an upper surface and a lower surface of the telescopic boom. The present invention relates to a load elevator including a lifting bucket that is movably mounted in the longitudinal direction of a telescopic boom via a guide unit that includes a roller that rolls on the carriage.

(Prior Art) As shown in FIG. 2, the conventional example of the above-described luggage lift truck has a telescopic boom 3 in which a base end portion of a swivel base 2 rotatably mounted on a vehicle 1 is undulatingly connected. An elevating bucket 5 is attached so as to be movable in the longitudinal direction of the telescopic boom 3 via a guide means 4 including rollers 4a and 4b that roll on the upper surface 3d and the lower surface 3e of the telescopic boom 3.

The base end of the telescopic boom 3 can be freely undulated to the swivel base 2 by extending a pair of left and right brackets 6, 6 from the base end of the telescopic boom 3 to the ventral side of the telescopic boom. The tip ends of the brackets 6, 6 are connected to a swivel-side bracket 7 (this bracket also has a left-right pair) that is erected on the swivel 2 via a hoisting fulcrum pin 8 so as to be hoistable. The hoisting cylinder 9 for hoisting the telescopic boom 3 is pivotally connected to both ends of the hoisting cylinder 9 at a position in front of the hoisting fulcrum pin 8 of the swivel base 2 and at a position of the telescopic boom 3 near the tip of the base boom 3a. They are arranged as 9a and 9b.

In the luggage lift configured as described above, the telescopic boom 3 is raised and retracted, the swivel base 2 is swung, and the guide means 4 is moved up and down across the base boom 3a of the telescopic boom 3 and the tip side booms 3a and 3b. Various kinds of luggage loaded in the lifting bucket 5 are moved up and down to an arbitrary place.

By the way, the above-mentioned conventional baggage elevator is provided with the guide means 4.
However, since the upper and lower surfaces of the telescopic boom 3 on which the rollers 4a and 4b are in rolling contact are used as guide surfaces to move in the longitudinal direction of the telescopic boom, the guide means 4 is reliably guided by the telescopic boom 3 and the telescopic boom is also provided. Although there is an advantage that it is not necessary to attach a guide rail separately to 3, the connection of the hoisting cylinder 9 on the telescopic boom 3 side is located near the tip of the base boom 3a, so that the guide means 4 is attached to the base end of the telescopic boom 3. There was a problem that it could not be lowered to a position near (base end of the base boom 3a).

Further, in this type of luggage lift, the telescopic boom 3 is usually raised and used in the vicinity of the vertical direction.
In this case, the telescopic boom 3 and the total center of gravity of the load are located rearward of the undulating fulcrum pin 8 and exert a force in the pulling direction on the undulating cylinder 9. That is, the telescopic boom 3 has a structure instructed by the pulling force of the hoisting cylinder 9 in a frequently used state, but the diameter of the hoisting cylinder 9 is increased in order to ensure a sufficient pulling force. Not only is it necessary, but generally there is a problem that reliably supporting the pulling force with the undulating cylinder 9 is less reliable than reliably supporting the compressing force.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is possible to lower the guide means 4 to a position near the base end of the telescopic boom 3 (a position near the base end of the base boom 3a). It is an object of the present invention to provide a load elevator having a structure in which the telescopic boom 3 is supported by the compressive force of the hoisting cylinder 9 in a frequently used state.

(Means for Solving Problems) In order to achieve the above-mentioned object, the luggage lift of the present invention is
A hoisting cylinder 9 for hoisting the telescopic boom 3 is provided, and both ends of the hoisting cylinder 9 are connected to the hoisting fulcrum pin 8 of the swivel base 2.
It is configured such that it is pivotally connected to the rearward position and to a position near the ventral surface of the telescopic boom 3 of the pair of left and right brackets 6, 6, respectively.

(Operation) According to the above configuration, the telescopic boom 3 of the undulating cylinder 9
Since the side pivot connection is not at the tip side position of the telescopic boom 3 unlike the conventional one, but is located at the pair of left and right brackets 6, 6 extending downward from the base end of the telescopic boom 3, Position the means 4 near the base end of the telescopic boom 3 (base boom
It can be lowered to the position near the base end of 3a). Further, the hoisting cylinder 9 can support the rotational moment around the hoisting fulcrum pin 8 of the telescopic boom 3 by a compressive force in a substantially vertical state in which the telescopic boom 3 is frequently used, and in this state, the hoisting cylinder 9 is provided. Since it is in a contracted state, it can be constructed in a small size and can be reliably supported.

(Embodiment) An embodiment of a luggage lift according to the present invention will be described below with reference to FIG.

The luggage lift according to the present invention comprises a hoisting cylinder 9 which is interposed between a swivel base 2 and a telescopic boom 3 to drive the telescopic boom 3 up and down.
Since the arrangement is characterized by the above-mentioned arrangement, the description of the conventional baggage elevator described above and shown in FIG.

In FIG. 1, the hoisting cylinder 9 has both ends thereof at a position rearward of the hoisting fulcrum pin 8 of the swivel and a pair of left and right brackets 6 and 6 extending to the telescoping boom ventral surface, near the telescopic boom ventral surface. Are connected to each other by pivotal connections 9a and 9b. In this embodiment, the telescopic cylinder 9 is composed of a single undulating cylinder 9 that passes between a pair of left and right brackets 6,6.

The telescopic boom 3 is driven up and down from a lying state in which it is laid down in front of the swivel base 2 to a substantially vertical up and down state. However, the hoisting cylinder 9 arranged as described above has the telescopic boom 3 lying down. In the vicinity, the force in the pulling direction acts,
The force in the compression direction acts when the telescopic boom is almost vertically undulated. That is, in a hoisting state of the telescopic boom (a state in which the telescopic boom 3 is lifted almost vertically) in which this type of cargo lift is frequently used, the undulating cylinder 9 in the contracted state causes the compressive stress of the undulating cylinder 9 to increase. Telescopic boom 9
Holds. Moreover, since the hoisting cylinder 9 is arranged between the brackets 6 and 6 and the swivel base 2, the guide means 4 can be lowered to a position near the base end portion of the telescopic boom 3.

(Effect) In the luggage lift of the present invention configured and operated as described above, the guide device that is vertically movable on the telescopic boom 3 and supports the lifting bucket 5 is lowered to a position near the base end of the telescopic boom 3. In addition to the above, it is possible to surely hold the frequently used telescopic boom raised state by the undulating cylinder 9 in the contracted state by the compressive stress of the undulating cylinder 9.

[Brief description of drawings]

FIG. 1 is an explanatory view of a luggage lift according to the present invention. FIG. 2 is an explanatory view of a conventional luggage lift. Vehicle: 1, swivel base; 2, telescopic boom; 3, guide means; 4, rollers; 4a, 4b, lifting buckets; 5, brackets; 6,6, swivel-side brackets; 7, undulating fulcrum pins; 8, Undulating cylinder; 9, pivot connection; 9a, 9b,

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A telescopic boom, the base end of which is rotatably connected to a revolving base mounted rotatably on a vehicle, is extended and retracted via guide means provided with rollers which are in rolling contact with the upper and lower surfaces of the telescopic boom. A cargo lift comprising a lifting bucket movably mounted in the longitudinal direction of the boom, wherein the base end of the telescopic boom is undulatingly connected to a swivel base.
A pair of left and right brackets are extended from the base end of the telescopic boom to the ventral side of the telescopic boom, and the tip of this bracket can be raised and lowered via a fulcrum fulcrum pin on the swivel side bracket installed upright on the swivel base. In this case, the hoisting cylinder for hoisting and driving the telescopic boom is pivotally mounted at both ends of the hoisting cylinder at a position rearward of the hoisting fulcrum pin of the swivel base and at a position near the telescopic boom ventral surface of the pair of left and right brackets. A luggage lift characterized by being connected and arranged.