Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Reexamination Certificate
2002-05-02
2003-04-29
Marcelo, Emmanuel (Department: 3654)
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
C254S372000, C254S342000
Reexamination Certificate
active
06554255
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a lifting gear which is arranged so that its load-sheave can be driven by a portable mechanical-driving equipment such as an electric driver or a portable manual-driving equipment such as a handle manually rotated.
Generally-used lifting gears are classified into those of a manual type having a chain that is manually moved or a lever that is manually rotated and those of electric type having an electric motor.
These lifting gears of the manual type and the electric type have almost the same construction except whether the driving means for driving the load-sheave is a chain or a lever, or an electric motor.
FIG. 1
shows a cross-sectional view showing a conventional lifting gear of the manual type. This lifting gear is provided with: a load-sheave
100
for shifting a sinuate body such as a load chain in the longitudinal direction; a rotatable shaft body at transmission side
101
that penetrates the load-sheave
100
; a ring body (a hand chain wheel)
102
that is threadedly engaged to one end of the shaft body
101
so as to rotate forwardly or reversely in an interlocked manner with the shifting operation of a chain (driving means); a braking mechanism (mechanical brake)
103
that transmits the forward rotation of the ring body
102
to the shaft body
101
, and also applies a braking force to the reverse rotation of the shaft body
101
thereof; a cover body
104
for covering the ring body
102
; a reduction gear mechanism
105
installed between the other end of the shaft body
101
and the load-sheave
100
; a pair of side plates
106
supporting the load-sheave
100
; and a gear cover
107
that is attached to one of the side plates
106
. Thus, the chain, passed and latched around the circumferential portion of the ring body
102
, is operated and shifted so as to forwardly or reversely rotate the ring body
102
so that the load-sheave
100
is driven by a torque transmitted through the braking mechanism
103
and through the shaft body at transmission side
101
and the reduction gear mechanism
105
.
Moreover, those of the electric type have an arrangement in which: although not shown in the Figure, the ring body
102
, the braking mechanism
103
and the cover body
104
are omitted therefrom, and a motor housing containing an electric motor is connected to one of the side plates, and the driving shaft of the electric motor is coupled to one end of the shaft body at transmission side so that the load-sheave is forwardly or reversely driven by the electric motor through the shaft body at transmission side and the reduction gear mechanism.
Here, as compared with that of the electric type, the lifting gear of the manual type, which uses a chain or a lever as the driving means, is compact and light-weight, and easily applicable to cases other than those hanged from the ceiling, and it is constructed at low costs; in contrast, since the load-sheave has to be manually operated, greater labor is required.
On the contrary, the lifting gear of the electric type using an electric motor as the driving means requires smaller labor as compared with those of the manual type; however, it is bulky and heavy as compared with those of the manual type, the application is limited to those cases hanged from the ceiling, and it also requires high costs.
BRIEF SUMMARY OF THE INVENTION
One of the objectives of the present invention is to provide a lifting gear which can use a portable mechanical-driving equipment, such as an electric driver commercially available as an electric tool, as a driving means for the load-sheave without the need for incorporating it in the lifting gear, by providing a power connecting portion for coupling the portable driving equipment to the rotary body for rotating the load-sheave.
Another objective of the present invention is to provide a lifting gear in which, in the case of the portable mechanical-driving equipment of a charging type, even if the battery runs short, the load-sheave can be driven by providing a handle detachably attached to the power connecting portion or a chain latch portion on which an operative chain is latched.
Still another objective of the present invention is to provide a lifting gear in which the rotary body is divided into a shaft body at input side that is inserted into a hole that allows the power connecting portion to expose to the outside of the frame and an interlock body that is interlocked with the load-sheave so that the portable driving equipment is easily coupled to the power connecting portion.
Still another objective of the present invention is to provide a lifting gear in which: it is possible to prevent the shaft body from sticking out of the frame, and also to prevent damages to the power connecting portion, by allowing the shaft body to be drawn from the hole when not used, and when used, coupling to the portable driving equipment is available by inserting the shaft body into the hole of the frame.
Still another objective of the present invention is to provide a lifting gear in which: it is possible to prevent damages to the shaft body at input side due to bending load and also to reduce power loss of the portable driving equipment, by providing the hole as a fitting hole to which the shaft body is fitted or attaching a bearing sleeve to the hole.
Still another objective of the present invention is to provide a lifting gear in which the load-sheave can be driven by a remote operation by providing a flexible-type shaft body.
Still another objective of the present invention is to provide a lifting gear in which, even when a charging-type electric driver commercially available as an electric tool is used as the portable mechanical-driving equipment, the load-sheave can be driven at a speed identical to that of a generally-used manual type which can generate a sufficient torque to lift a predetermined load, by providing a reduction mechanism.
Still another objective of the present invention is to provide a lifting gear in which, even when the shaft body at input side is rotated without a load applied thereon, the load-sheave can be driven without the rotation of the frame, by using a reduction mechanism having a planetary gear.
In the lifting gear in accordance with the first aspect which is a lifting gear having a load-sheave for shifting a sinuate body in the longitudinal direction and a rotary body for rotating the load-sheave in an interlocked manner with the driving means, the rotary body is provided with a power connecting portion that can be coupled to the driving means using a portable driving equipment.
In the first aspect, since the rotary body for rotating the load-sheave is provided with the power connecting portion that can be coupled to the driving means that uses a portable driving equipment, a portable mechanical-driving equipment, such as a charging-type electric driver commercially available as an electric tool, is coupled to the power connecting portion so that the portable mechanical-driving equipment is used as the driving means for the load-sheave; thus it is possible to reduce labor required as compared with that of a manual type. Moreover, since a manually operable construction is provided without the need for incorporating the portable driving equipment into the lifting gear, the lifting gear is compact and light-weight as compared with those of the electric type, and easily applicable to cases other than those hanged from the ceiling, and it is constructed at low costs.
In the lifting gear in accordance with the second aspect that has a modified construction of the first aspect, a frame for covering the load-sheave and the rotary body is provided, and a hole that allows the power connecting portion to expose to the outside is formed in the frame.
In the second aspect, since the hole that allows the power connecting portion to expose to the outside is formed in the frame covering the load-sheave and the rotary body, the frame makes it possible to prevent the rotary body from contacting other things and being damaged, and the portabl
Burns Doane , Swecker, Mathis LLP
Elephant Chain Block Co., Ltd.
Marcelo Emmanuel
LandOfFree
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