Hoist driven by the transfer gearbox of a vehicle

Details Hoist driven by the transfer gearbox of a vehicle Hoist driven by the transfer gearbox of a vehicle

1999-05-13

2001-10-09

Marcelo, Emmanuel M. (Department: 3653)

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

C254S345000

Reexamination Certificate

active

06299140

ABSTRACT:

RELATED PATENT
This patent application stems from PCT/BY97/00008 by inventor Alexandr Konstantinovich Kamljuk, entitled HOIST DRIVEN BY THE TRANSFER GEARBOX OF A VEHICLE, for which priority and the benefit of the earlier filing dates of the parent PCT patent application, and patent application no. 961,065 of Belarus, filed Nov. 19, 1996 is claimed for common subject matter pursuant to 35 U.S.C. §119.
The invention relates to hoists of vehicles, in particular, and can be used for improving their cross-country capability, for helping other blocked vehicles, for dragging loads onto the platforms of vehicles, for lifting and lowering loads and represents a new type of pulling and pulling-lifting hoists.
BACKGROUND OF THE INVENTION, THEREFOR
A, hoist is known in the art to comprise a winding drum, a reduction gear, a two-position clutch, and a control mechanism Inventor's Certificate U.S. Ser. No. 1,505,886, cl. Pub. 1989. This hoist does not provide automatic stop of the winding drum when the hoist is switched off.
A, vehicle hoist is known in the art to comprise a winding drum mounted on two supports and a reduction gear the input shaft of the vehicle hoist is connected with the engine of the vehicle through clutch and disengageable power take-off shaft, as well as a mechanism of the winding drum switching off at unwinding of the cable A. S. Antonov. Army Vehicles. Part 2. M. Military Publisher, 1970, p. 376-385, FIG. XVII.5. This hoist has a small pulling speed, low efficiency and large specific mass (mass of hoist per maximum pulling force).
From the technical point the closest to the declared solutions the hoist driven by the transfer gearbox of a vehicle comprising a winding drum, a reduction gear, and a winding drum switching and stopping mechanisms mounted on two supports Hoist Braden MS 50: Publicity Brochures. Guide on installation, Service and Maintenance Work. This hoist has the same disadvantages as the previous one. To increase the cable pulling speed the worm reduction gear ratio was reduced. The reduction gear became non-self-breaking that caused the necessity of installation of additional brakes: on the winding drum, on the worm of the reduction gear, and on the drive that complicates the construction and control, reduces the reliability of the hoist and increases its specific mass.
SUMMARY OF THE INVENTION
The task of the invention is the increase of pulling speed and efficiency, the simplification of control, the reduction of specific mass, and the simplification of manufacturing and service.
The increase of pulling speed and, consequently, the permissible capacity of the hoist in comparison with those of the known hoist is provided by means of the reduction gear with small gear ratio and of non-self-breaking type and due to the presence of the special mechanism which automatically stops the winding drum at drive disengagement and prevents the unwinding of the loaded cable. Thus, the gear ratio of the reduction gear of the hoist is decreased between 2.5 and 3 times, in comparison with that of the prior art hoist, and its efficiency is increased to 0.92, 5 times reduction of its friction losses. The simplification of control is provided by automatic stop of the winding drum at drive disengagement and by means of connection of the hoist braking chamber control with the clutch control of the vehicle, thus, the reliability of the drum braking increases as well. Making the reduction gear compound and placing its components on the external sides of the supports give the possibility to place the winding drum between the supports, having lengthened it to the reduction gear width that permits to reduce the, number of cable layers on winding drum without reduction of its cable capacity and to reduce the input torque on the winding drum drive as well as in more than 1.5 times reduced the specific mass of the hoist (mass of the hoist relative to maximum pulling force) as compared to the known hoist of the similar purpose. In comparison with the norms for newly designed vehicle hoist according to, the hoist has between 2.0 and 2.8 times (for the hoist of a pulling-lifting function and for the hoist of a pulling function, respectively) smaller specific mass (mass of a hoist relative to maximum pulling force) with double safety margin of the hoist.
The stated task is solved in the following way: in the hoist driven by the transfer gearbox of a vehicle comprising a winding drum, a reduction gear, and a winding drum switching and stopping mechanisms mounted on two supports, the reduction gear is made in the shape of conical and a planetary gears connected by a linking shaft, the winding drum stopping mechanism is made in the shape of a toothed free-wheeling clutch that connects one of the shafts transferring torque to the winding drum with one of supports.
The toothed free-wheeling clutch of the hoist is made in the shape of two counter sprung half-clutches with butt-end forced and wedged teeth, one of half-clutches has an extended forced tooth, the other has a locking ring with a slot and butt-end wedged teeth, the extended forced tooth enters into the slot of the locking ring, on the half clutches the wedged teeth are made with a circle shift relative to the forced tooth by the half of the extended forced tooth width.
The winding drum switching mechanism is made in the shape of a loaded by spring sun gear mounted on the linking shaft and connected with the air cylinder fixed on one of supports.
To extend the field of the hoist application and its use not only as a pulling one but as a lifting one as well, between the support and an additional shaft of the toothed free-wheeling clutch there is installed a brake normally switched on an energy accumulator. The brake is equipped with a braking chamber and its control for braking action reinforcement at the moment of stopping the load in the suspended state and for taking up the dynamic tension originating in this case and braking reduction at lowering the load.
For co-ordination of the joint work of the clutch of the vehicle and the braking chamber providing automatic engagement or disengagement of the braking chamber at clutch disengagement or clutch engagement, the braking chamber control is connected to the clutch control of the vehicle by means of a two-circuit valve.
Additional objects and advantages of the invention are set forth in part in the description which follows, and in part are obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention also may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.


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Braden Model MS50, Braden Winch Co., Broken Arrow, Oklahoma (Brochure).
ITAG SAEJ706a, ITAG, Germany (Brochure).

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