US20010044986A1 - Manway lid lifter - Google Patents
Manway lid lifter Download PDFInfo
- Publication number
- US20010044986A1 US20010044986A1 US09/255,289 US25528999A US2001044986A1 US 20010044986 A1 US20010044986 A1 US 20010044986A1 US 25528999 A US25528999 A US 25528999A US 2001044986 A1 US2001044986 A1 US 2001044986A1
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- US
- United States
- Prior art keywords
- lid
- manway
- assembly
- hinge pin
- cam member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 238000003466 welding Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1463—Hinged connection of cover to frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/10—Manholes; Inspection openings; Covers therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
- E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
- E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
- E05F1/1041—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis
- E05F1/105—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis with a compression spring
- E05F1/1058—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring perpendicular to the pivot axis with a compression spring for counterbalancing
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2999/00—Subject-matter not otherwise provided for in this subclass
Definitions
- This invention relates generally to manhole or manway covers, and more particularly to a device to assist in the lifting of such cover.
- U.S. Pat. Nos. 4,137,669 and 5,038,520 use conical compression springs pulling a rod to assist.
- U.S. Pat. No. 5,184,422 also uses a compression spring, but vertically oriented to assist the limited distance left of a lid which swings away from the manway in a horizontal plane.
- U.S. Pat. No. 5,394,650 uses torsion springs around a horizontal hinge pin to assist the lid lifting. Spring balanced lids have been available in the marine industry for at least twenty years.
- Cen-Tex brand hatches with spring-assisted lids is available from Timco Industries, Inc. of New Albany, Ind. These use torsion springs to balance round, rectangular, and elongate oval shapes of lids.
- Some aspects of inconvenience in the mounting or use of one or more of these devices are the necessity of attaching one or more components of the balancing assembly to the manway frame or cover, the inability to hold the cover open adequately, the inability or difficulty in adjusting the balancing force to prevent the cover from dropping, and the necessity to use welding equipment for some installations to manway frames.
- the difficulty of adapting the balancing assembly to various styles of covers and arrangements of hinging the cover to the manway frame has been an ongoing problem.
- a balancer mount is connected to the manway hinge and engages the manway frame to locate the lifter assembly.
- a cam is situated in the mount for pivotal action on the hinge and has a portion to engage the lid, and a portion to receive a force applied by a balancing spring seated in the mount.
- a spring adjustment device is provided at a readily accessible location on the mount.
- the lid lifter assembly is arranged to provide the lid lifting assist at a location between the hinge arms of the lid.
- the lifter assembly is mounted outboard of the hinge arms and applies the lift assist at a location outboard of the hinge arms but adjacent one of the hinge arms.
- the lifter assembly has a housing with at least one arm portion engaging the lid hinge mounting bracket of the manway to hold and control the lifter assembly housing relative to the manway.
- FIG. 1 is a top plan view of a manway/lid assembly with the lid lifter assembly mounted thereto.
- FIG. 2. is a bottom plan view showing only the manway frame, hinge mounting brackets and the lifter assembly.
- FIG. 3 is a section through the assembly of FIG. 1 taken at line 3 - 3 in FIG. 1 and viewed in the direction of the arrows.
- FIG. 4 is a section like FIG. 3 but showing the lid in the open and neutral balanced position.
- FIG. 5 is a pictorial view of the lifter assembly separate from the manway assembly.
- FIG. 6 is an exploded view thereof.
- FIG. 7 is a pictorial view of an alternate embodiment of the invention.
- FIG. 8 is an exploded view of the alternate embodiment.
- FIG. 9 is an exploded view of a manway/lid assembly with the lid lifter assembly of the alternate embodiment.
- FIG. 10 is a top plan view thereof, with a portion of the manway lid broken away to show the location of the cam relative to the lid.
- FIG. 11 is a section therethrough taken at line 11 - 11 in FIG. 10 and viewed in the direction of the arrows.
- FIG. 12 is an enlarged fragmentary section through the lifter assembly taken at 12 - 12 in FIG. 10 and viewed in the direction of the arrows.
- the manway assembly 11 is mounted to the top of a compartment 12 (shown only fragmentarily and not in section) of a marine vessel, railroad tank car, or stationery installation, for example. It includes the frame 13 which is normally welded in place on the compartment, and a lid 14 connected by a hinge pin 16 to a couple of brackets 17 welded to the frame 13 .
- a hinge pin 16 to a couple of brackets 17 welded to the frame 13 .
- the hinge arm portion 18 of the lid has a slot 19 therein and has a couple of buttresses 21 to strengthen the lid at the hinge mounting arms.
- a mount for the lid lifter assembly 22 is connected to the hinge pin 16 and has a portion engaging the manway frame to position and stabilize the mount.
- the mount may have different forms, the illustrated example includes a downwardly-opening U-shaped channel 23 having apertures 24 therein receiving flanged bushings 26 through which the hinge bolt 16 extends.
- a cotter pin 27 at each end retains the hinge pin in the assembly as shown in FIG. 1.
- the U-channel 23 has a stop plate 28 affixed by welding or otherwise to the front end 29 of the channel.
- the stop plate 28 has laterally extending arms 28 A bearing on brackets 17 .
- the U-channel 23 also has a door clip 31 fixed to the bottom edges 32 by welding, and a door 36 whose lower edge is received within the door clip.
- the door extends upwardly along the rear edges 37 of the channel to the top 38 where it is fastened by a screw to a spring adjustment block 39 welded in the top of the U-channel.
- a spring adjustment screw 41 is threaded into block 39 and has a lower end received in a top retainer 42 for a compression spring 43 whose lower end is received on the spring bottom retainer 44 .
- the spring bottom retainer is connected by a threaded stud 46 to the upper end of a yoke member 47 , whose lower end is pinned in aperture 48 at one end of a cam 49 , which has an aperture 50 pivotally mounted on the bushings 26 received on the hinge pin 16 whereby the cam is rockably mounted to the hinge pin 16 .
- the opposite end of the cam 49 has a bar 51 affixed thereto and which is engageable with the lower edges 52 of arms 18 .
- the compression spring is in position to act along axis 55 and urge the cam in a clockwise direction (FIG. 3) to operate as a first class lever caming the lid in an opening direction of arrow 56 .
- the lid lifter according to the present invention can be mounted to a variety of conventional manway and lid assemblies, by simply removing the hinge pin, putting the mount and cam in place and re-installing the hinge pin through the cam and mount and the lid and manway hinge apertures. Then the amount of assist can be adjusted by simply turning the screw at the top to compress the spring as desired. No special tools or techniques are needed. No fastener (other than the binge pin) or welding, is required.
- FIGS. 7 - 12 To demonstrate the adaptability to another type of conventional manway and lid assembly, FIGS. 7 - 12 are provided and will be described now.
- the lifter assembly 122 is provided to assist the person to lift the lid assembly 114 which is pivotally mounted by the hinge 116 to the manway brackets 117 fixed on the manway frame 113 as by welding, for example.
- the lid has only a single hinge arm 118 pivotally mounted on the hinge bolt 116 , rather than the arm 18 slotted at 19 in the manway assembly of FIGS. 1 - 4 .
- this alternate embodiment 122 is mounted outboard of bracket 117 L as best shown in FIG. 10.
- the inverted U-channel 123 is provided with a stop plate 128 only on the channel wall 123 N that is adjacent the bracket 117 L.
- the arm 128 A extends laterally from the plate 128 affixed to the front edge 129 of channel wall 123 N, and is positioned to bear downward on the top 117 T (FIGS. 9 and 11) of bracket 117 L when the lift assembly 122 is mounted on the hinge pin 116 .
- the plate 128 of the alternate embodiment is positioned immediately adjacent the wall of frame 113 .
- the bracket engaging arms 28 A and 128 A prevent the spring force from turning the housing counterclockwise under load.
- the lid contacting portion of the cam 149 has a horizontal offset at 149 A which brings the lid-contacting top portion 151 of the cam closer to the center of the lid hinge arm 118 .
- portion 151 is clearly under the tab 161 at one side of the lid hold-down bolt slot adjacent the hinge arm 118 , whereby the cam portion 141 is able to engage the tab for lifting, as best shown in FIG. 12.
- the stop and rod 163 are not required, as the spring adjusting screw 141 can be adjusted to hold the lid open at a 60° angle from the closed position, and it is not necessary to lift the lid all the way back to the stop.
- the stop rod 63 and hinge abutment 164 are beneficial.
- the other features of the lift assembly can be identical to those described above for the first embodiment. These include the door 136 , the spring adjustment block 139 , the spring adjustment screw 141 , top retainer 142 , compression spring 143 , bottom retainer 144 , threaded stud 146 , yoke member 147 and pin 148 .
- the arrangement of the spring 143 and adjusting screw 141 , spring rate, dimensions from pivot pin axis to the axis of connector pin 148 , and the contact point of bar 51 in the first embodiment or cam top 151 in the second embodiment with the lid, can be determined based upon the size and weight of the lid, the amount of lift assist desired, and the angle of the lifter assembly load applying axis 55 extending through pin 48 , relative to horizontal. Good lift assistance consistent with size and space requirements of the lift assembly according to the present invention can be achieved with an angle of axis 55 up from horizontal at 53°.
- FIGS. 9 - 12 The manway/lid assembly of FIGS. 9 - 12 is constructed somewhat different from that shown in FIGS. 1, 3 and 4 , but the installation of the complete lift assembly 122 is just as easy for this embodiment as for the first.
- the cam 149 will already be pivotally mounted on bushings 126 received in apertures 125 in the U-channel 123 .
- the rest of the components 139 - 148 will be in place in the channel 123 .
- it is only necessary to remove the hinge pin 116 install it through the bushings 126 and then through the manway bracket 117 L, washer 162 L, hinge arm 118 , washer 161 R, bracket 117 R, the flat washer, lock washer, and install the nut on the hinge pin bolt.
- the lid stop rod 163 can remain in place during this entire procedure. There is usually a weld at the outside face of each of the hinge brackets 117 L and 117 R where the stop rod had been welded to the bracket.
- the notch 123 F in the front of wall 123 N is large enough to accommodate the bulge of the weld, and still permit the wall 123 N to be placed snug against the outside face of the bracket 117 L without interference.
- the stop rod can be cut out and discarded to admit the stop plate 28 and front end of the assist assembly to place it against the manway wall 13 . In that case, if the user desires to open the lid entirely, it can be rested on the top of the U-channel in the absence of the stop rod.
- the present invention will work regardless of whether the hole in the hinge arm 18 or 118 is round, or elongated to accommodate some vertical travel while being clamped down closed as standard hold-down clamps (not shown) are applied. Additional washers such as 162 L can be used to avoid lateral tilting of the lid by the outboard-mounted lift assembly of FIGS. 7 - 12 if the spacing between the hinge arm and brackets 117 L and 117 R of the manway assembly is excessive.
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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Abstract
Description
- This invention relates generally to manhole or manway covers, and more particularly to a device to assist in the lifting of such cover.
- Because of the weight of manway lids, various efforts have been made to make it easier to open them. Usually such devices are associated with the lid hinge assembly. U.S. Pat. Nos. 4,137,669 and 5,038,520 use conical compression springs pulling a rod to assist. U.S. Pat. No. 5,184,422 also uses a compression spring, but vertically oriented to assist the limited distance left of a lid which swings away from the manway in a horizontal plane. U.S. Pat. No. 5,394,650 uses torsion springs around a horizontal hinge pin to assist the lid lifting. Spring balanced lids have been available in the marine industry for at least twenty years. A variety of Cen-Tex brand hatches with spring-assisted lids is available from Timco Industries, Inc. of New Albany, Ind. These use torsion springs to balance round, rectangular, and elongate oval shapes of lids. Some aspects of inconvenience in the mounting or use of one or more of these devices are the necessity of attaching one or more components of the balancing assembly to the manway frame or cover, the inability to hold the cover open adequately, the inability or difficulty in adjusting the balancing force to prevent the cover from dropping, and the necessity to use welding equipment for some installations to manway frames. The difficulty of adapting the balancing assembly to various styles of covers and arrangements of hinging the cover to the manway frame has been an ongoing problem.
- Described briefly, according to a typical embodiment of the present invention, a balancer mount is connected to the manway hinge and engages the manway frame to locate the lifter assembly. A cam is situated in the mount for pivotal action on the hinge and has a portion to engage the lid, and a portion to receive a force applied by a balancing spring seated in the mount. A spring adjustment device is provided at a readily accessible location on the mount.
- In one embodiment, the lid lifter assembly is arranged to provide the lid lifting assist at a location between the hinge arms of the lid. In another embodiment, the lifter assembly is mounted outboard of the hinge arms and applies the lift assist at a location outboard of the hinge arms but adjacent one of the hinge arms. In both instances, the lifter assembly has a housing with at least one arm portion engaging the lid hinge mounting bracket of the manway to hold and control the lifter assembly housing relative to the manway.
- FIG. 1 is a top plan view of a manway/lid assembly with the lid lifter assembly mounted thereto.
- FIG. 2. is a bottom plan view showing only the manway frame, hinge mounting brackets and the lifter assembly.
- FIG. 3 is a section through the assembly of FIG. 1 taken at line3-3 in FIG. 1 and viewed in the direction of the arrows.
- FIG. 4 is a section like FIG. 3 but showing the lid in the open and neutral balanced position.
- FIG. 5 is a pictorial view of the lifter assembly separate from the manway assembly.
- FIG. 6 is an exploded view thereof.
- FIG. 7 is a pictorial view of an alternate embodiment of the invention.
- FIG. 8 is an exploded view of the alternate embodiment.
- FIG. 9 is an exploded view of a manway/lid assembly with the lid lifter assembly of the alternate embodiment.
- FIG. 10 is a top plan view thereof, with a portion of the manway lid broken away to show the location of the cam relative to the lid.
- FIG. 11 is a section therethrough taken at line11-11 in FIG. 10 and viewed in the direction of the arrows.
- FIG. 12 is an enlarged fragmentary section through the lifter assembly taken at12-12 in FIG. 10 and viewed in the direction of the arrows.
- For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
- Referring now to the drawings in detail, and particularly FIGS.1-6, the
manway assembly 11 is mounted to the top of a compartment 12 (shown only fragmentarily and not in section) of a marine vessel, railroad tank car, or stationery installation, for example. It includes theframe 13 which is normally welded in place on the compartment, and alid 14 connected by ahinge pin 16 to a couple ofbrackets 17 welded to theframe 13. This is a fairly conventional type of installation. In the illustrated embodiment, thehinge arm portion 18 of the lid has aslot 19 therein and has a couple ofbuttresses 21 to strengthen the lid at the hinge mounting arms. - According to this first embodiment of the present invention, a mount for the
lid lifter assembly 22 is connected to thehinge pin 16 and has a portion engaging the manway frame to position and stabilize the mount. While the mount may have different forms, the illustrated example includes a downwardly-opening U-shapedchannel 23 having apertures 24 therein receivingflanged bushings 26 through which thehinge bolt 16 extends. Acotter pin 27 at each end retains the hinge pin in the assembly as shown in FIG. 1. The U-channel 23 has astop plate 28 affixed by welding or otherwise to thefront end 29 of the channel. Thestop plate 28 has laterally extendingarms 28A bearing onbrackets 17. The U-channel 23 also has adoor clip 31 fixed to thebottom edges 32 by welding, and adoor 36 whose lower edge is received within the door clip. The door extends upwardly along therear edges 37 of the channel to thetop 38 where it is fastened by a screw to aspring adjustment block 39 welded in the top of the U-channel. Aspring adjustment screw 41 is threaded intoblock 39 and has a lower end received in atop retainer 42 for acompression spring 43 whose lower end is received on thespring bottom retainer 44. The spring bottom retainer is connected by a threadedstud 46 to the upper end of ayoke member 47, whose lower end is pinned inaperture 48 at one end of acam 49, which has anaperture 50 pivotally mounted on thebushings 26 received on thehinge pin 16 whereby the cam is rockably mounted to thehinge pin 16. The opposite end of thecam 49 has abar 51 affixed thereto and which is engageable with thelower edges 52 ofarms 18. Thus, the compression spring is in position to act alongaxis 55 and urge the cam in a clockwise direction (FIG. 3) to operate as a first class lever caming the lid in an opening direction ofarrow 56. - The lid lifter according to the present invention can be mounted to a variety of conventional manway and lid assemblies, by simply removing the hinge pin, putting the mount and cam in place and re-installing the hinge pin through the cam and mount and the lid and manway hinge apertures. Then the amount of assist can be adjusted by simply turning the screw at the top to compress the spring as desired. No special tools or techniques are needed. No fastener (other than the binge pin) or welding, is required.
- To demonstrate the adaptability to another type of conventional manway and lid assembly, FIGS.7-12 are provided and will be described now. In these figures, components having the same or similar characteristics in the description of the first embodiment will be given the same reference numerals, where convenient, but with the additional digit “1”. Accordingly, the
lifter assembly 122 is provided to assist the person to lift thelid assembly 114 which is pivotally mounted by thehinge 116 to the manway brackets 117 fixed on themanway frame 113 as by welding, for example. But in this manway assembly, the lid has only asingle hinge arm 118 pivotally mounted on thehinge bolt 116, rather than thearm 18 slotted at 19 in the manway assembly of FIGS. 1-4. Therefore, the lift assembly according to FIGS. 1-6 cannot be mounted in the plane of the centerline of themanway assembly 113/114. Instead, thisalternate embodiment 122 is mounted outboard ofbracket 117L as best shown in FIG. 10. For that purpose, the invertedU-channel 123 is provided with astop plate 128 only on thechannel wall 123N that is adjacent thebracket 117L. Thearm 128A extends laterally from theplate 128 affixed to thefront edge 129 ofchannel wall 123N, and is positioned to bear downward on the top 117T (FIGS. 9 and 11) ofbracket 117L when thelift assembly 122 is mounted on thehinge pin 116. Similar to the relationship shown in FIG. 3 for the first embodiment, theplate 128 of the alternate embodiment is positioned immediately adjacent the wall offrame 113. Thebracket engaging arms - Because of the offset location of the
lift assembly 122 with respect to the center line of the manway assembly, the lid contacting portion of thecam 149 has a horizontal offset at 149A which brings the lid-contactingtop portion 151 of the cam closer to the center of thelid hinge arm 118. Thus,portion 151 is clearly under thetab 161 at one side of the lid hold-down bolt slot adjacent thehinge arm 118, whereby thecam portion 141 is able to engage the tab for lifting, as best shown in FIG. 12. - A few additional differences between the second embodiment and the first embodiment may be noted, such as the shape of the
bottom plate 131, considering the different lengths of thewalls U-channel 123. Another is thenotch 123F in the front of thewall 123N and the notched washers 162 shown in FIG. 9 to accommodate thelid stop rod 163 normally found in this particular style of manway/lid assembly and which is in position to engage theunderside 164 of thehinge arm 118 to provide a stop when the lid of the conventional lid assembly is opened. With the lifter assembly of the present invention, the stop androd 163 are not required, as thespring adjusting screw 141 can be adjusted to hold the lid open at a 60° angle from the closed position, and it is not necessary to lift the lid all the way back to the stop. Of course, for those users who would be inclined to open the lid as far as it would go, the stop rod 63 and hingeabutment 164 are beneficial. - Apart from the differences and some details described specifically above, the other features of the lift assembly can be identical to those described above for the first embodiment. These include the
door 136, thespring adjustment block 139, thespring adjustment screw 141,top retainer 142,compression spring 143,bottom retainer 144, threadedstud 146,yoke member 147 andpin 148. The arrangement of thespring 143 and adjustingscrew 141, spring rate, dimensions from pivot pin axis to the axis ofconnector pin 148, and the contact point ofbar 51 in the first embodiment orcam top 151 in the second embodiment with the lid, can be determined based upon the size and weight of the lid, the amount of lift assist desired, and the angle of the lifter assemblyload applying axis 55 extending throughpin 48, relative to horizontal. Good lift assistance consistent with size and space requirements of the lift assembly according to the present invention can be achieved with an angle ofaxis 55 up from horizontal at 53°. - The manway/lid assembly of FIGS.9-12 is constructed somewhat different from that shown in FIGS. 1, 3 and 4, but the installation of the
complete lift assembly 122 is just as easy for this embodiment as for the first. Thecam 149 will already be pivotally mounted onbushings 126 received inapertures 125 in theU-channel 123. The rest of the components 139-148 will be in place in thechannel 123. Then it is only necessary to remove thehinge pin 116, install it through thebushings 126 and then through themanway bracket 117L,washer 162L,hinge arm 118, washer 161R,bracket 117R, the flat washer, lock washer, and install the nut on the hinge pin bolt. Thelid stop rod 163 can remain in place during this entire procedure. There is usually a weld at the outside face of each of thehinge brackets notch 123F in the front ofwall 123N is large enough to accommodate the bulge of the weld, and still permit thewall 123N to be placed snug against the outside face of thebracket 117L without interference. In cases where the manway lid will accommodate the center-mounted lift assembly of FIGS. 1-6, and if the manway happens to have a stop rod such as 163 in FIG. 11, the stop rod can be cut out and discarded to admit thestop plate 28 and front end of the assist assembly to place it against themanway wall 13. In that case, if the user desires to open the lid entirely, it can be rested on the top of the U-channel in the absence of the stop rod. - The present invention will work regardless of whether the hole in the
hinge arm brackets - While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/255,289 US6446307B2 (en) | 1999-02-22 | 1999-02-22 | Manway lid lifter |
Applications Claiming Priority (1)
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US09/255,289 US6446307B2 (en) | 1999-02-22 | 1999-02-22 | Manway lid lifter |
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US20010044986A1 true US20010044986A1 (en) | 2001-11-29 |
US6446307B2 US6446307B2 (en) | 2002-09-10 |
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US09/255,289 Expired - Lifetime US6446307B2 (en) | 1999-02-22 | 1999-02-22 | Manway lid lifter |
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US7127849B1 (en) | 2002-09-26 | 2006-10-31 | Gayer Jason E | Manway lift device having an adjustable biasing assembly therefor |
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