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Patent Searching and Data


Title:
SHEET GRIPPING DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/082197
Kind Code:
A1
Abstract:
A sheet gripping device is designed to temporarily grip an insulation sheet which is to be bonded to heat insulators attached to inner wall surfaces of a ship cargo compartment. The sheet gripping device includes a frame placed on the heat insulators across a target bonding region defined between the heat insulators, first and second fixing units mounted to opposite end portions of the frame for removably fixing the frame to the heat insulators, and a pressing unit mounted to the frame between the first and second fixing units for releasably pressing the insulation sheet against the target bonding region.

Inventors:
HAN SEONG-JONG (KR)
CHOI JONG-UNG (KR)
PARK YOUNG-JUN (KR)
LEE DONG BAE (KR)
Application Number:
KR2007/006959
Publication Date:
July 10, 2008
Filing Date:
December 28, 2007
Export Citation:
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Assignee:
SAMSUNG HEAVY IND (KR)
HAN SEONG-JONG (KR)
CHOI JONG-UNG (KR)
PARK YOUNG-JUN (KR)
LEE DONG BAE (KR)
International Classes:
B63B9/00; B63B3/68; B65H35/00
Foreign References:
KR20060078998A2006-07-05
KR20050015840A2005-02-21
KR0109917Y11995-10-18
Attorney, Agent or Firm:
JANG, Seong Ku (Trust Tower 275-7,Yangjae-dong, Seocho-gu, Seoul 137-130, KR)
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Claims:

Claims

[1] A sheet gripping device for temporarily gripping an insulation sheet which is to be bonded to heat insulators attached to inner wall surfaces of a ship cargo compartment, comprising: a frame placed on the heat insulators across a target bonding region defined between the heat insulators; first and second fixing units mounted to opposite end portions of the frame for removably fixing the frame to the heat insulators; and a pressing unit mounted to the frame between the first and second fixing units for releasably pressing the insulation sheet against the target bonding region.

[2] The sheet gripping device of claim 1, wherein at least one of the first and second fixing units includes a sliding block movable toward or away from the corresponding one of the heat insulators, a clamp means for moving the sliding block toward the corresponding one of the heat insulators and a spring means for resiliently biasing the sliding block against the corresponding one of the heat insulators.

[3] The sheet gripping device of claim 1, wherein the pressing unit includes a pressing pad for making contact with the insulation sheet and a clamp means for moving the pressing pad toward the insulation sheet to press the insulation sheet against the target bonding region.

[4] The sheet gripping device of claim 1, wherein the frame includes a pair of guide rails for guiding movement of the sliding block.

[5] The sheet gripping device of any one of claims 1 to 4, wherein the sheet gripping device is used in combination with an automatic gluing machine for bonding the insulation sheet to the inner wall surfaces of the ship cargo compartment, thereby gripping the insulation sheet at the trailing side of the automatic gluing machine.

[6] The sheet gripping device of claim 3, wherein the pressing pad is made of an elastically deformable material.

Description:

Description SHEET GRIPPING DEVICE

Technical Field

[1] The present invention is directed to a sheet gripping device and, more particularly, a sheet gripping device for temporarily gripping an insulation sheet, e.g., a triplex insulation sheet, which are to be bonded to heat insulators attached to the inner wall surfaces of a ship cargo compartment. Background Art

[2] In a ship cargo compartment for storing cargoes at an ultra low temperature, heat insulators capable of adapting themselves to a broad range of temperature variations, coping with a thermal stress and a thermal shrinkage and preventing infiltration of heat into the cargo compartment need to be attached to the inner wall surfaces of a ship cargo compartment.

[3] Conventionally, insulation sheets such as triplex insulation sheets or the like are bonded to inter-insulator channel regions (hereinafter referred to as "target bonding regions") extending in lattice-like directions between heat insulators. When bonding the insulation sheets to the target bonding regions, an adhesive agent such as epoxy glue, polyurethane glue or the like is used to assure permanent bonding of the insulation sheets.

[4] Prior to permanently bonding the insulation sheets, a temporary sheet fixing operation is manually performed whereby one end of an insulation sheet is temporarily fixed and the remaining portion of the insulation sheet is spread over a target gap region.

[5] The temporary sheet fixing operation is performed while an operator takes one of different postures including a flat posture, a horizontal posture, a vertical posture and an overhead posture. The operation performed in these postures is as hard and difficult as it may cause musculoskeletal disorders to the operator. For this reason, there is a need to perform the temporary sheet fixing operation in a rapid, simple and easy manner.

[6] In the conventional temporary sheet fixing operation, use is made of an adhesive- based temporary fixing method in which an insulation sheet is temporarily fixed to the target bonding region by use of an adhesive tape and a stapler-based temporary fixing method in which an insulation sheet is temporarily fixed to the target bonding region by use of a stapler gun.

[7] With the adhesive-based temporary fixing method, however, an adhesive agent needs to be used in a quantity great enough to bear the weight of the insulation sheet, which

increases the consumption amount of the adhesive tape and the costs involved in the temporary fixing operation.

[8] In the target bonding regions to which the adhesive tape is to be bonded, there exist dust generated in the process of attaching heat insulators, glass wool separated from flat joints and fine particles detached from foam plugs. This makes it difficult to reliably perform the temporary fixing operation of the insulation sheet. It is sometimes required to perform a re-fixing operation, in which process the adhesive tape looses its bonding force. This necessitates use of an increased quantity of adhesive tape, thereby making the temporary fixing operation inconvenient, costly and inefficient.

[9] With stapler-based temporary fixing method, an insulation sheet is fixed to the target bonding region by means of staples dispensed from a stapler gun. Therefore, the insulation sheet and the heat insulators are pierced and damaged by the staples. Once the insulation sheet is fixed in place, it is quite difficult to adjust the position of the insulation sheet. A further drawback is that a severe difficulty encounters in removing the staples at the end of the temporary fixing operation.

[10]

Disclosure of Invention Technical Problem

[11] In view of the above-noted problems, it is an object of the present invention to provide a sheet gripping device that can temporarily fix an insulation sheet to a target bonding region within a ship cargo compartment by a pressing method, thereby gripping the insulation sheet in a reliable manner without causing damage to heat insulators and with minimized use of an adhesive tape.

[12]

Technical Solution

[13] With the above objects in view, the present invention provides a sheet gripping device for temporarily gripping an insulation sheet which is to be bonded to heat insulators attached to inner wall surfaces of a ship cargo compartment, comprising:

[14] a frame placed on the heat insulators across a target bonding region defined between the heat insulators;

[15] first and second fixing units mounted to opposite end portions of the frame for removably fixing the frame to the heat insulators; and

[16] a pressing unit mounted to the frame between the first and second fixing units for re- leasably pressing the insulation sheet against the target bonding region.

[17] As used herein, the terms "vertical toggle clamp" and "horizontal toggle clamp" refer to mechanical devices that can perform clamping and unclamping operations merely by rotating a vertical handle lever and a horizontal handle lever.

[18] For example, each of the vertical toggle clamp and the horizontal toggle clamp includes a vertical handle lever or a horizontal handle lever rotatable within an extent of 1 to 180 degrees, an "L"-like latch connected at one end to the vertical handle lever or the horizontal handle lever and spread apart at the other end in a "Y" -like shape, the latch having a generally "L"-like end portion, a pair of "T"-like hinge brackets attached to outer surfaces of the "L"-like end portion of the latch, and a plurality of hinges or couplers provided in the "T"-like hinge brackets.

[19]

Advantageous Effects

[20] The sheet gripping device of the present invention provides an advantage in that an insulation sheet can be quickly pressed and fixed in place through a simple clamping operation, thereby temporarily fixing the insulation sheet to a target bonding region in a rapid and reliable manner.

[21] Furthermore, the sheet gripping device of the present invention provides an advantage in that it is capable of avoiding damage of an insulation sheet and heat insulators and eliminating the need to use an adhesive tape.

[22] Moreover, the sheet gripping device of the present invention provides an advantage in that it is capable of enabling an operator to easily perform a sheet fixing operation and consequently preventing musculoskeletal disorders of the operator.

[23] In addition, the sheet gripping device of the present invention provides an advantage in that it is capable of improving the environment of a temporary sheet fixing operation, shortening the time required in performing the operation and eventually increasing the productivity of a ship.

[24]

Brief Description of the Drawings

[25] Fig. 1 is a perspective view showing a sheet gripping device in accordance with one embodiment of the present invention.

[26] Fig. 2 is a partially cut-away plan view of the sheet gripping device shown in Fig. 1.

[27] Fig. 3 is a right side view of the sheet gripping device shown in Fig. 2.

[28] Fig. 4 is a front elevational view of the sheet gripping device shown in Fig. 2, illustrating a state that the sheet gripping device is installed in place.

[29] Fig. 5 is a view showing a state that the sheet gripping device shown in Fig. 2 is in use.

[30]

Best Mode for Carrying Out the Invention

[31] A preferred embodiment of a sheet gripping device in accordance with the present invention will now be described in detail with reference to the accompanying

drawings.

[32] Fig. 1 is a perspective view showing a sheet gripping device in accordance with one embodiment of the present invention. Fig. 2 is a partially cut-away plan view of the sheet gripping device shown in Fig. 1. Fig. 3 is a right side view of the sheet gripping device shown in Fig. 2. Fig. 4 is a front elevational view of the sheet gripping device shown in Fig. 2, illustrating a state that the sheet gripping device is installed in place. Fig. 5 is a view showing a state that the sheet gripping device shown in Fig. 2 is in use.

[33] Referring to Fig. 1, a sheet gripping device 100 in accordance with one embodiment of the present invention is used in bonding an insulation sheet 3 such as a triplex insulation sheet or the like to an object bonding region 2 that extends in lattice-like directions between heat insulators 1 attached to a ship cargo compartment. The sheet gripping device 100 is a straddling device supported on the heat insulators 1 arranged along opposite sides of the object bonding region 2.

[34] The sheet gripping device 100 includes a frame 110 that serves as a jig placed over the corner portions of the neighboring heat insulators 1. The sheet gripping device 100 further includes a first fixing unit 120 supported on one lateral portion of the frame 110 and biased toward one of the neighboring heat insulators 1 by means of a plurality of first springs. The sheet gripping device 100 further includes a second fixing unit 130 supported on the other lateral portion of the frame 110 and biased toward the other of the neighboring heat insulators 1 by means of a horizontal toggle clamp and a plurality of second springs.

[35] Although the biasing force of the second fixing unit 130 is generated by use of the below-mentioned horizontal toggle clamp 131 in the illustrated embodiment, it is needless to say that a turnbuckle may be used to generate the biasing force of the second fixing unit 130.

[36] The sheet gripping device 100 further includes a sheet pressing unit 140 for pressing the insulation sheet 3 against the target bonding region 2 or releasing the insulation sheet 3. The sheet pressing unit 140 includes a plurality of vertical toggle clamps 141 and 142 and a pressing pad 146 attached to the vertical toggle clamps 141 and 142. The pressing pad 146 is moved upwardly or downwardly by means of the vertical toggle clamps 141 and 142 to press or release the insulation sheet 3.

[37] As can be seen in Figs. 2 and 3, the frame 110 includes a vertical plate member 111 extending in the same direction as the moving direction of the pressing pad 146 and serving as a support base of the sheet pressing unit 140, a horizontal plate member 112 extending backwardly from the vertical plate member 111 at a right angle, two pairs of guide rails 113 and 114 respectively attached to the opposite lateral end portions of the horizontal plate member 112 for guiding lateral movement of the first fixing unit 120 and the second fixing unit 130 within a predetermined stroke, a pair of spring rests

formed in one lateral end portion of the horizontal plate member 112 for supporting the first springs 121 of the first fixing unit 120, and a clamp mounting bracket 116 formed in the other lateral end portion of the horizontal plate member 112 for holding the horizontal toggle clamp 131 of the second fixing unit 130.

[38] In this regard, the horizontal plate member 112 is provided with a cutout portion 117 formed in the rear end portion thereof. The cutout portion 117 allows an operator to easily confirm the operating state of the horizontal toggle clamp 131 with naked eyes and also allows the operator to easily grip and operate the horizontal toggle clamp 131.

[39] As best shown in Fig. 3, each pair of the guide rails 114 have an "L"-like cross section and face each other in a spaced-apart relationship. A first sliding block 125 of the first fixing unit 120 and a second sliding block 137 of the second fixing unit 130 are slidably fitted to the pairs of the guide rails 114.

[40] Each of the vertical toggle clamps 141 and 142 is configured to reciprocate a shaft member 144 in the sheet pressing and releasing directions in response to a clamping or unclamping operation of a vertical handle lever 143. The shaft member 144 of each of the vertical toggle clamps 141 and 142 has a pad holding member 145 at its tip end. The sheet pressing pad 146 is detachably attached to the pad holding member 145 by means of bolts. It is preferred that the sheet pressing pad 146 is made of polyurethane or other elastically deformable materials in order to increase a friction force between the sheet pressing pad 146 and the insulation sheet 3.

[41] Referring again to Fig. 2, the first fixing unit 120 includes a plurality of first springs

121 supported on the spring rests 115 of the frame 110, a first sliding block 125 slidably fitted to the corresponding pair of guide rails 113 and formed into an inverted "L"-like cross section for engagement with the corner portion of the corresponding heat insulator 1, the first sliding block 125 having a plurality of spring receiving recesses on one surface thereof, and a stopper bolt 126 slidably inserted into a bolt receiving hole of the first sliding block 125 at one end and fixedly secured to the frame 110 at the other end in such a manner that the first sliding block 125 can make sliding movement toward or away from the corresponding heat insulator 1 within a limited stroke with no possibility of separation from the guide rails 113.

[42] The second fixing unit 130 includes a horizontal toggle clamp 131 slidably fitted to the clamp mounting bracket 116 of the frame 110. The horizontal toggle clamp 131 is configured to reciprocate a shaft member 133 in response to a clamping or unclamping operation of a horizontal handle lever 132. A spring pressing plate 135 is connected to the tip end of the shaft member 133. The spring pressing plate 135 is slidably fitted to the corresponding pair of the guide rails 114 at its opposite ends. The spring pressing plate 135 is provided with a plurality of spring receiving recesses for receiving one end portions of the second springs 136. The other ends of the second springs 136 are

received within the spring receiving recesses of the second sliding block 137.

[43] The second sliding block 137 has the same shape as that of the first sliding block 125 set forth earlier. The second sliding block 137 is slidably fitted to the corresponding pair of guide rails 114, with the second springs 136 retained between the spring pressing plate 135 and the second sliding block 137. A stopper bolt 138 is inserted into the bolt receiving hole of the second sliding block 137 at one end and connected to the shaft member 133 at the other end so that the second sliding block 137 can be slid within a predetermined stroke.

[44] The stopper bolts 126 and 138 set forth above allow the first sliding block 125 and the second sliding block 137 to be slid along the corresponding pairs of guide rails 113 and 114 within a limited stroke. This eliminates the need to additionally provide separate spring guide bolts within the first and second springs 121 and 136 of the first fixing unit 120 and the second fixing unit 130, eventually simplifying the structure of the first fixing unit 120 and the second fixing unit 130.

[45] Next, description will be made on the operation of the sheet gripping device configured as above.

[46] Referring to Fig. 4, an operator brings the sheet gripping device 100 into a target bonding region 2 where the insulation sheet 3 is to be bonded to the heat insulators 1. Then, the first fixing unit 120 is placed over the corner portion of the corresponding heat insulator 1, i.e., the left heat insulator as viewed in the figure, and the second fixing unit 130 is put on the corner portion of the corresponding heat insulator 1, i.e., the right heat insulator as viewed in the figure.

[47] In this state, the horizontal handle lever 132 of the horizontal toggle clamp 131 is rotated to perform a clamping operation. During the clamping operation, the shaft member 133 connected to the horizontal toggle clamp 131 is moved toward the right heat insulator and, at the same time, the spring pressing plate 135 connected to the shaft member 133 compresses the second springs 136, in response to which the second sliding block 137 is pressed against the corner portion of the corresponding heat insulator 1.

[48] At this time, the second springs 136 exerts a reaction force in such a direction as to move the sheet gripping device 100 toward the oppositely arranged heat insulator 1. Therefore, the first springs 121 of the first fixing unit 120 are compressed to thereby press the first sliding block 125 against the oppositely arranged heat insulator 1. In this way, the sheet gripping device 100 is quickly and stably fixed to the heat insulators 1 around the target bonding region 2 by performing a single clamping operation.

[49] In this state, an insulation sheet 3 is positioned between the pressing pad 146 of the sheet pressing unit 140 and the target bonding region 2. Then, the vertical handle levers of the vertical toggle clamps 141 and 142 of the sheet pressing unit 140 are

rotated to ensure that one end portion of the insulation sheet 3 can be pressed against the target bonding region 2. Thus, the insulation sheet 3 is temporarily fixed in pace in preparation for additional bonding operations. When releasing the insulation sheet 3, the sheet gripping device 100 is operated in the reverse order.

[50] Referring to Fig. 5, the sheet gripping device 100 may be used in combination with an automatic gluing machine (AMG) 300. The automatic gluing machine 300 is an automated apparatus that applies epoxy glue or urethane glue on the target bonding region 2 and bonds a triplex insulation sheet to the target bonding region 2.

[51] The automatic gluing machine 300 is installed above the target bonding region 2 between the heat insulators 1. The sheet gripping device 100 is installed on the trailing side of the automatic gluing machine 300 and fixed to the heat insulators 1 by operating the horizontal toggle clamp 131. Then, the vertical toggle clamps 141 and 142 are operated to press one end portion of the insulation sheet 3 against the target bonding region 2.

[52] In a state that one end portion of the insulation sheet 3 is fixed in place by the sheet gripping device 100, the automatic gluing machine 300 is moved forward to unwind the insulation sheet 3 from a sheet roll. The insulation sheet 3 thus unwound is bonded to the target bonding region 2, after which the sheet gripping device 100 is operated to release the insulation sheet 3.

[53] While a preferred embodiment of the invention has been described hereinabove, the present invention is not limited to this embodiment. It is to be understood that various changes and modifications may be made without departing from the scope of the invention defined in the claims.

[54]

Industrial Applicability

[55] The sheet gripping device of the present invention can be advantageously used in the field of temporarily gripping an insulation sheet before it is adhesively bonded to heat insulators attached to the inner wall surfaces of a ship cargo compartment.