Coupling device

Abstract
A coupling device has a shackle, a hook connected to the shackle, and a safety clamp device surrounding the shackle. The safety clamp device has a central reinforced rib, a flap bar, a slot, a plurality of clamp teeth, and a flexible plate. The flexible plate has a curved portion and a guide recess. The flap bar is inserted in the slot of the safety clamp device.
Description




BACKGROUND OF THE INVENTION




The present invention relates to a coupling device. More particularly, the present invention relates to a coupling device which has a safety clamp device.




Referring to

FIGS. 1 and 1A

, a conventional coupling device


10


′ has a shackle


11


′, a hook


12


′ connected to the shackle


11


′, a safety clamp plate


20


′ disposed on the shackle


11


′, a spring


40


′ disposed between the shackle


11


′ and the safety clamp plate


20


′, and a rivet


30


′ fastening the safety clamp plate


20


′, the spring


40


′, and the shackle


11


′ together. However, a hole should be formed on the shackle


11


′ in order to receive the rivet


30


′. Therefore, a structure of the shackle


11


′ is weakened.




SUMMARY OF THE INVENTION




An object of the present invention is to provide a coupling device which has a safety clamp device surrounding a shackle without damaging a structure of the shackle.




Another object of the present invention is to provide a coupling device which has a safety clamp device surrounding a shackle stably.




Accordingly, a coupling device comprises a shackle, a hook connected to the shackle, and a safety clamp device surrounding the shackle. The safety clamp device has a central reinforced rib, a flap bar, a slot, a plurality of clamp teeth, and a flexible plate. The flexible plate has a curved portion and a guide recess. The flap bar is inserted in the slot of the safety clamp device.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a perspective view of a conventional coupling device of the prior art;





FIG. 1A

is a partially sectional view of a conventional coupling device of the prior art;





FIG. 2

is a perspective view of a coupling device of a first preferred embodiment in accordance with the present invention;





FIG. 2A

is a partially enlarged view of

FIG. 2

;





FIG. 2B

is a partially sectional view of a coupling device of a first preferred embodiment in accordance with the present invention;





FIG. 3

is an elevational view of a semi-product of a safety clamp device of a first preferred embodiment in accordance with the present invention;





FIG. 4

is a schematic view illustrating an operation of a safety clamp device of a first preferred embodiment in accordance with the present invention;





FIG. 5

is a perspective view of a coupling device of a second preferred embodiment in accordance with the present invention;





FIG. 5A

is a partially sectional view of a coupling device of a second preferred embodiment in accordance with the present invention;





FIG. 6

is a perspective view of a coupling device of a third preferred embodiment in accordance with the present invention; and





FIG. 7

is a perspective view of a coupling device of a fourth preferred embodiment in accordance with the present invention.











DETAILED DESCRIPTION OF THE INVENTION




Referring to

FIGS. 2

to


4


, a first coupling device


10


comprises a shackle


11


, a hook


12


connected to the shackle


11


, and a safety clamp device


20


surrounding the shackle


11


.




The safety clamp device


20


has a central reinforced rib


24


, a flap bar


22


, a slot


23


, a plurality of clamp teeth


21


, and a flexible plate


25


.




The flexible plate


25


has a curved portion


27


and a guide recess


26


.




The flap bar


22


is inserted in the slot


23


of the safety clamp device


20


.




Referring to

FIGS. 5 and 5A

, a second coupling device


10




a


comprises a shackle


11




a


and a safety clamp device


20




a


surrounding the shackle


11




a.






The shackle


11




a


has a plurality of indentations


13




a.






The safety clamp device


20




a


has a plurality of protruded teeth


28




a


to engage with the indentations


13




a


of the shackle


11




a.






Referring to

FIG. 6

, a third coupling device


10




b


comprises a shackle


11




b


and a safety clamp device


20




b


surrounding the shackle


11




b.






Referring to

FIG. 7

, a fourth coupling device


10




c


comprises a shackle


11




c


and a safety clamp device


20




c


surrounding the shackle


11




c.






The present invention is not limited to the above embodiments but various modification thereof may be made. Furthermore, various changes in form and detail may be made without departing from the scope of the present invention.



Claims
  • 1. A coupling device comprises:a shackle, a hook connected to the shackle, and a safety clamp device surrounding the shackle, the safety clamp device having a central reinforced rib, a flap bar, a slot, a plurality of clamp teeth, and a flexible plate, the flexible plate having a curved portion and a guide recess, and the flap bar inserted in the slot of the safety clamp device.
  • 2. The coupling device as claimed in claim 1, wherein the shackle has a plurality of indentations, and the safety clamp device has a plurality of protruded teeth to engage with the indentations of the shackle.
US Referenced Citations (5)
Number Name Date Kind
62194 Hayden Feb 1867 A
504039 Kempshall Aug 1893 A
3354522 Amon Nov 1967 A
5832572 Norrby Nov 1998 A
5913479 Westwood, III Jun 1999 A
Foreign Referenced Citations (2)
Number Date Country
0128412 Jun 1919 GB
0136230 Dec 1919 GB