US2780197A - Cargo-hatches - Google Patents

Description

E. E. VON TELL CARGO-HATCHES Feb. 5, 1957 2 Shets-Sheet 1 Filed Nov. 9, 1953 E. E. VON TELL CARGO-HATCHES 2 Sheets- 2 Feb.

Filed No 1953 United States Patent CARGO-HATCHES Edward Elias von Tell, Goteborg, Sweden Application'November 9, 1953, Serial No. 391,011 Claims priority, application Sweden November 28 '1952 i 2 Claims. (Cl. ru -202i The present invention refers to cargo-hatches of the type comprising at least three sections pivotally connected to one another, one of the two outermost of thesesections being pivotally connected to the frame of the hatch, while the adjacent section is adapted at the opening of the hatch to be lowered with the lower side thereof against the lower side of the first-mentioned section connected to the frame. At the opening of a hatch of this type one would hitherto proceed so that the second one of the two outermost of three sections, for example, would be sprung substantially through 180 to be caused to bear with its upper side against the upper side of the intermediate section, whereupon all of the three sections would be raised into a substantially vertical position. Particularly where relatively large sections are brought into consideration, it might be found troublesome to undertake the swinging of the outermost section through 180, because after a raising movement through 90 a critical position will be reached, at which the winches have to be operated with a certain cautiousness.

The cargo-hatch according to the invention is principally distinguished by means for raising the other section or sections connected to the two first-mentioned sections from the frame to facilitate displacement of said section (sections) along the frame in a substantially lowered position.

The invention will be explained in the following with reference to the accompanying drawings, wherein Figs. 1 and 2 show a hatch constructed according to the invention in two different positions during the opening of the hatch, while Fig. 3 is a section through the border portion of a hatch with its frame constructed in accordance with the invention. Fig. 4 shows certain details of the hatch according to Figs. 1 and 2 in elevation.

In Figs. 1 and 2, 1 designates the frame of a trisected hatch, the three sections of which are designated by 2,

3 and 4, respectively. Of these sections, section 2 is pivotally connected to one end of the frame by means of a hinge 5, and the pivot pin between the sections 2 and 3 is denoted by 6. The section 4 is pivotally connected to the section 3 by means of a pivot pin 7.

Guide rails 8 extend along the sides of the frame 1 and cooperate with supporting members 9 and 10, the configuration of which is best shown in Fig. 4. The latter figure shows certain portions of the sections 3 and 4 in elevation, when the hatch is in its completely lowered position. In this position the supporting member 9 projects down into a recess 11 in the guide rail 8, while the rounded end of the supporting member 10, which is secured to the section 3 and projects past the pivot pin 7, projects down into another recess 12 in the guide rail. Provided on the latter isa wedge-like cam member 13, whichis displaceable and adapted to be locked in different positions for a purpose to be set forth in the following.

Fig. 3 shows a section through a hatchand the frame thereof. As will appear from this figure, a packing 14 is provided on the lower side of each hatch section, said packing being preferably made from rubber or the like.

; manner that the packing.14 .is raised from the frame 1,

when the sections 2, S are loweredvin the manner shown r ice When the hatch is in its lowered position, the packing is pressed against the upper side of the frame 1 with the aid of bolts 15, and for this reason the supporting members 9 and 10 must have facilities for moving somewhat in a vertical direction. When the hatch is to be removed, the bolts 15 are loosened, while the members 9 and 10 still project somewhat downwardly into their recesses. Before the raising operation is commenced, the cam 13 is caused to bear on the supporting member 10, and it is readily.

understood that the pivot pin 7 will be raised in such in Fig.1. At thesame'tiine a displacement of section 4 takes place toward the hinge 5, the supporting member 9 then sliding up onto the guide rail 8. In this manner section 4 will slide along the frame 1 in a substantially horizontal position, but with the packing 14 raised'from the frame.

Figs. 1 and 2 show a winch 17 arranged on a mast house or the like 16, the rope 18 of said winch being extended over a guide roller 19 provided on a mast 20. Secured to the pivot pin 6 is a block 21, through which the rope 18 passes in order then to extend further through a block 22, which is arranged on the mast 20 above the guide roller 19. The free end of the rope 18 is secured by means of a hook 23 to the free border of section 4.

The method in opening the hatch should be readily understood from the two Figures 1 and 2. As soon as the pivot pin 6 commences to rise, section 4 is raised according to the description hereinbefore, said section then sliding along the frame 1, until sections 2 and 3 take the position shown in Fig. 2, when a continued pull in the rope 18 causes an upward swing of section 4 toward the two remaining sections. By reason of the fact that the rope 13 is also secured to section 4, the pressure of this section on the guide rail 8 will be considerably reduced, whereby the friction between the supporting member 9 and the guide rail 8 will diminish. In dependence on the weight of the various sections and so forth it may be found suitable under certain circumstances to secure the hook 23 by a distance inwardly of section 4, so that the latter does not take oif entirely from the guide rail 8, whereby the operation of opening the hatch would be interfered with.

In the example shown, special means are provided for the operation of the hatch, but the same may obviously also be operated, for instance, by means of one of the cargo spars of the ship. If desired, it is possible to make use of two supporting members on section 4, said members being substantially of the same type as the supporting member 9, the supporting member 10 being then excluded. It is also readily understood that substantially the same advantages will be obtained, if a further section is added to section 4, said further section then obviously also having to be provided with supporting members.

As will be seen from Fig. 4, the supporting member 9 is of a length greater than that of the recess 12, for which reason the supporting member 9 easily passes over the recess in consideration without falling down into the same.

As indicated above, the invention can be modified in its details wtihin the scope of the following claims. Thus the guide rails and the supporting members may be placed inside the frame without any disadvantage should such location be found suitable. Further modifications are also conceivable without having to be mentioned in this andthird sections for "lifting said third section from the frameand imparalle'lto the"sarneduring 'the"m'oveme'nt" secondsect-iompast the hinge? between the second and third sections anda projection atfthe*free.'end fof'thethi'rd section, and-guide=railsj extending along the'fra'me and havingrecesses to-receive said supporting members in the closed 'position -of the cover, said supportingfrnembers' having sliding surfaces to cooperate withsaid guide rails, the sliding. surface of the arm'on'the second section being cu rved',and"the slidingf surface of"'the"pi'ojection on the third section'being straight.

2; The combination set forth in'jclaim' 1" and "wherein the recess for the supporting 'member on theisecond" sec tion' is'shorter than the sliding surface of the projection on the third section, whereby to permit said projection said last-named recess withol it falling down therein.

References Cited in the file of this patent UNITED STATES PATENTS 1,158,946 McGray Nov. 2, 1915 1,904,735 Isherwood-et a1. Apr. 8, 1933 2,256,087 Hay Sept. 16, 1941 2,656,810 Jernstr'om- Oct: 27, 1953 FOREIGN PATENTS 667,464. Great-Britain- Mar: 5,1952- 816,206 Germany Oct. 8, 1951 836,608 Germany' Apr. 15, 1952

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