US3719404A - Crane boom having universally swiveled wear pads - Google Patents

Crane boom having universally swiveled wear pads Download PDF

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Publication number
US3719404A
US3719404A US00090377A US3719404DA US3719404A US 3719404 A US3719404 A US 3719404A US 00090377 A US00090377 A US 00090377A US 3719404D A US3719404D A US 3719404DA US 3719404 A US3719404 A US 3719404A
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US
United States
Prior art keywords
boom section
boom
wear pad
support housing
section
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.)
Expired - Lifetime
Application number
US00090377A
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English (en)
Inventor
R Sterner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kidde Inc
Original Assignee
Walter Kidde and Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Walter Kidde and Co Inc filed Critical Walter Kidde and Co Inc
Application granted granted Critical
Publication of US3719404A publication Critical patent/US3719404A/en
Assigned to KIDDE, INC., reassignment KIDDE, INC., CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). FILED 4-16-80 DELAWARE Assignors: WALTER KIDDE & COMPANY, INC.
Assigned to KIDDE INDUSTRIES, INC. reassignment KIDDE INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). MARCH 31, 1988 (DELAWARE) Assignors: BLOOM-1 INC.
Assigned to KIDDE INDUSTRIES, INC. reassignment KIDDE INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). APRIL 5, 1988 DELAWARE Assignors: HKID 45 INC.
Assigned to KIDDE, INC., A DE CORP. reassignment KIDDE, INC., A DE CORP. MERGER (SEE DOCUMENT FOR DETAILS). MEMORANDUM OF DISTRIBUTION IN LIQUIDATIOIN Assignors: HIMP-2 INC., A DE CORP. (CHANGED TO), KIDDE, INC., A DE CORP. (MERGED INTO)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/707—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding devices for telescopic jibs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/02—Sliding-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting

Definitions

  • Each such assembly consists of a support housing for a pair of laterally spaced wear pad units and within the support housing are retainer means for each wear pad unit.
  • Each unit includes low friction wear pad elements for direct frictional engagement with the bottom face of the next innermost boom section and spherically curved universally self-adjusting seating means for the wear pad elements.
  • FIG. 1 is a fragmentary side elevation, partly in section, of a multi-section telescoping crane boom equipped with self-adjusting wear pad means embodying the invention
  • FIG. 2 is an enlarged transverse vertical section taken on line 2-2 of FIG. 1;
  • FIG. 3 is a fragmentary plan view, partly in section and partly broken away, showing the wear pad means
  • FIG. 4 is an enlarged longitudinal vertical section taken on line 4-4 ofFIG. 2.
  • FIG. 1 there is shown a fragmentary part of a plural section telescoping crane boom, such as a hydraulically operated boom, having telescoping sections 10, 11 and 12. While the wear pad means of the invention is adaptable to a variety of boom configurations, the invention has been illustrated in connection with a boom whose telescoping sections are trapezoidal in transverse cross section.
  • This particular shape has the advantage of enabling the laterally spaced wear pads on the front and bottom of each boom section to be placed directly under the side walls of the next innermost boom section so as to directly receive the load forces and greatly eliminate transverse bending stresses which effect booms of other cross sectional shapes where it is not possible to locate the wear pads directly under the side webs.
  • the boom mid-section 11 comprises upwardly converging side webs 13 whose lower ends are welded to lower side longitudinal relatively heavy reinforcing bars 14, interconnected transversely by a lower horizontal web 15.
  • the next outermost boom section 10, such as another mid-section or base section of the boom, is similarly constructed and includes upwardly converging side web 16 and an interconnecting bottom horizontal web 17, the latter having large rectangular notches 18 in its forward corners to accommodate the self-adjusting wear pad units constituting the invention.
  • Each lower wear pad assembly embodying the invention comprises a support housing 19 in the form of a sturdy transverse channel member secured by welding to the particular boom section at its forward end and' bottom. More particularly, the member 19 forms a part of the customary reinforcing collar 19' which surrounds the forward end of each boom section. The member 19 directly underlies the forward end portion of bottom web 17 and has its opposite end portions located beneath the notches 18. Reinforcing end plates 20 are welded to the ends of the support housing 19 to close these ends and the plates 20 at their tops are tied directly to the side walls of boom section 10 for rigidity as shown in FIG. 2.
  • each pair of retainer plates 21, near and above their bottoms and welded securely thereto is a' hardened steel bearing block 22 having a concave spherically curved seat 23 formed in its top.
  • a hardened steel swivel plate 24 Freely resting upon each spherical seat 23 is a hardened steel swivel plate 24 whose lower face is convex and spherically curved to match the curvature of the seat 23.
  • Resting freely on top of each swivel plate 24 is a preferably steel pad retainer block 25 which is rectangular and elongated so as to extend substantially for the full distance between the forward and rear sides of support housing 19, FIG. 4. Referring to FIGS.
  • the elements 24 and 25 have their opposite sides spaced slightly from the vertical plates 21
  • the pad retainer blocks 25 each have a pair of relatively shallow rectangular recesses 26 in their upper faces receiving removably therein a pair of rectangular wear pads 27, each having a flat upper face for direct frictional contact with the lower faces of bars 14.
  • the wear pads 27 are preferably fiberglass reinforced nylon plate elements impregnated with graphite and sold materials may be employed in some instances.
  • the wear pads 27 have the ability to adjust themselves universally on the spherical seats 23 so as to remain in full surface contact with the bars 14 regardless of changes in angularity of the latter due to canting of the boom sections 11 and 10 as depicted in FIG. 1.
  • This canting or cocking is caused to increase somewhat as the telescoping boom sections approach the outward limits of their extension because of the inherent clearances between sections of the boom.
  • the range of self-adjustment of the pads 27 will always be sufficient to accommodate maximum misalignment or canting between adjacent boom sections. Friction is minimized and wear on the pads 27 is minimized with the invention.
  • a telescoping crane boom first and second telescoping boom sections having bottom surfaces disposed in close proximity to each other, means forming a support housing for laterally spaced wear pad units on the forward end and bottom of the first boom section, said support housing located beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means in said support housing and located below the bottom surface of the first boom section, and wear pad devices resting on said universally self-adjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of said second boom section in complete seating engagement as the angularity between said first and second boom sections changes during telescopic movement of the second boom section.
  • bearing means in said support housing comprising bearing block elements having top spherically curved recesses, means anchoring the bearing blocks to said support housing below said bottom surface of said first boom section, coacting self-adjusting spherically curved swivel devices on said bearing blocks, and flat faced wear pad elements on the swivel devices frictionally engaging said bottom surface of said second boom section.
  • first and second telescoping boom sections means forming a support for laterally spaced wear pad units on the forward end and bottom of the first boom section comprising a reinforcing collar on the forward end of said first boom section including: transverse channel member connected beneath the ttom surface of said first boom section,
  • bearing means comprising fixed bearing blocks within the opposite end portions of the channel member and having top spherically curved seats, spherically curved swivel plates engaging said seats and adapted to swivel freely thereon universally, and wear pad devices resting on the tops of said swivel plates and underlying said bottom surface of said second boom section.
  • each wear pad device comprising a wear pad retainer block having plural retainer recesses in its top face, and a corresponding number of wear pads mounted within the retainer recesses.
  • first and second telescoping boom sections having bottom surfaces in close proximity to each other, means forming a support for laterally spaced wear pad units on the forward end and bottom of the first boom section including a transverse channel member extending across and below the bottom surface of the first boom section at its forward end, laterally spaced bearing block elements having top spherically curved recesses, pairs of spaced upstanding plates fixedly secured within the transverse channel members near the opposite ends thereof anchoring the bearing block elements to said support below the bottom surface of the first boom section, coacting spherically curved universally self-adjusting swivel devices on said bearing blocks, and flat faced wear pad elements on theswivel devices extending upwardly through apertures in the bottom surface of said first boom section above said pairs of spaced upstanding plates and frictionally engaging said bottom surface of the second boom section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
US00090377A 1970-11-17 1970-11-17 Crane boom having universally swiveled wear pads Expired - Lifetime US3719404A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9037770A 1970-11-17 1970-11-17

Publications (1)

Publication Number Publication Date
US3719404A true US3719404A (en) 1973-03-06

Family

ID=22222521

Family Applications (1)

Application Number Title Priority Date Filing Date
US00090377A Expired - Lifetime US3719404A (en) 1970-11-17 1970-11-17 Crane boom having universally swiveled wear pads

Country Status (11)

Country Link
US (1) US3719404A (fr)
JP (1) JPS538093B1 (fr)
BE (1) BE770481A (fr)
BR (1) BR7106640D0 (fr)
CA (1) CA940092A (fr)
DE (1) DE2149510C3 (fr)
ES (1) ES392978A1 (fr)
FR (1) FR2113829B1 (fr)
GB (1) GB1312214A (fr)
NL (1) NL170121C (fr)
ZA (1) ZA714167B (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807108A (en) * 1972-09-18 1974-04-30 Harnischfeger Corp Structural design of boom section with inverted {37 a{38 {11 frame cross-section
US3837502A (en) * 1973-03-12 1974-09-24 Bucyrus Erie Co Light weight boom construction
US4257201A (en) * 1979-04-19 1981-03-24 American Hoist & Derrick Company Self-centering telescoping beams
EP0207028A2 (fr) * 1985-06-21 1986-12-30 Thune-Eureka A/S Agencement dans un palier ajustable pour rouleau pour le guidage latéral de bandes en mouvement
US4759452A (en) * 1987-02-20 1988-07-26 Faint Richard C Articulated load bearing wear pad assembly
US5158189A (en) * 1991-12-12 1992-10-27 Watson Brothers Industries, Inc. Boom support system
DE19608210C1 (de) * 1996-03-04 1997-10-09 Kidde Ind Inc Vorrichtung zur Führung eines Teleskopteils für einen Teleskop-Ausleger
DE19741202C1 (de) * 1997-09-18 1998-10-22 Kidde Ind Inc Gleitlager für Teleskopteile
US20020022068A1 (en) * 1999-11-24 2002-02-21 Pierre Glaesener Flexible shoe assembly
GB2375753A (en) * 2001-03-24 2002-11-27 Bamford Excavators Ltd Wear pad for a stabiliser leg
US20070098536A1 (en) * 2005-10-31 2007-05-03 Kooima Roger D Extendable telescoping boom and method of manufacturing
US20080038106A1 (en) * 2005-10-05 2008-02-14 Oshkosh Truck Corporation Mobile lift device
US20090208150A1 (en) * 2008-02-20 2009-08-20 Aida Engineering, Ltd. Slide guide apparatus of press machine
US7683564B2 (en) 2005-10-05 2010-03-23 Oshkosh Corporation System for monitoring load and angle for mobile lift device
US8827559B2 (en) * 2012-08-23 2014-09-09 The Heil Co. Telescopic arm for a refuse vehicle
US10144584B2 (en) 2013-10-01 2018-12-04 The Curotto-Can, Llc Intermediate container for a front loading refuse container
CN109844262A (zh) * 2016-08-19 2019-06-04 久益环球地下采矿有限责任公司 切削装置及其支撑件
US10415384B2 (en) 2016-01-27 2019-09-17 Joy Global Underground Mining Llc Mining machine with multiple cutter heads
US10472961B2 (en) 2012-09-14 2019-11-12 Joy Global Underground Mining Llc Cutter head for mining machine
US10533416B2 (en) 2016-09-23 2020-01-14 Joy Global Underground Mining Llc Rock cutting device
US10876400B2 (en) 2016-08-19 2020-12-29 Joy Global Underground Mining Llc Mining machine with articulating boom and independent material handling system
US11319754B2 (en) 2018-07-25 2022-05-03 Joy Global Underground Mining Llc Rock cutting assembly
US11391149B2 (en) 2016-08-19 2022-07-19 Joy Global Underground Mining Llc Mining machine with articulating boom and independent material handling system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2255251B1 (fr) * 1973-12-20 1976-11-19 Creusot Loire
DE9209738U1 (de) * 1992-07-20 1993-02-25 Kinshofer Greiftechnik GmbH, 8176 Waakirchen Greifer, vorzugsweise Steinstapelgreifer
DE202010014103U1 (de) * 2010-10-08 2012-01-10 Liebherr-Werk Ehingen Gmbh Auslegerelement, Teleskopausleger sowie Baufahrzeug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE211367C (fr) *
US3160376A (en) * 1962-05-21 1964-12-08 H & S Co Inc Loom anti-vibration mounting means
US3243052A (en) * 1965-04-08 1966-03-29 Grove Mfg Co Telescopic crane boom with longitudinally extending cylinder connector
US3462023A (en) * 1967-07-12 1969-08-19 Grove Mfg Co Reinforcement member for telescoping boom assembly
US3620579A (en) * 1969-06-13 1971-11-16 American Hoist & Derrick Co Extensible boom assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE211367C (fr) *
US3160376A (en) * 1962-05-21 1964-12-08 H & S Co Inc Loom anti-vibration mounting means
US3243052A (en) * 1965-04-08 1966-03-29 Grove Mfg Co Telescopic crane boom with longitudinally extending cylinder connector
US3462023A (en) * 1967-07-12 1969-08-19 Grove Mfg Co Reinforcement member for telescoping boom assembly
US3620579A (en) * 1969-06-13 1971-11-16 American Hoist & Derrick Co Extensible boom assembly

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807108A (en) * 1972-09-18 1974-04-30 Harnischfeger Corp Structural design of boom section with inverted {37 a{38 {11 frame cross-section
US3837502A (en) * 1973-03-12 1974-09-24 Bucyrus Erie Co Light weight boom construction
US4257201A (en) * 1979-04-19 1981-03-24 American Hoist & Derrick Company Self-centering telescoping beams
EP0207028A2 (fr) * 1985-06-21 1986-12-30 Thune-Eureka A/S Agencement dans un palier ajustable pour rouleau pour le guidage latéral de bandes en mouvement
US4717267A (en) * 1985-06-21 1988-01-05 Thune-Eureka A/S Arrangement in an adjustable roller bearing for lateral guidance of running webs
EP0207028A3 (en) * 1985-06-21 1989-01-25 Thune-Eureka A/S An arrangement in an adjustable roller bearing for lateral guidance for running webs
US4759452A (en) * 1987-02-20 1988-07-26 Faint Richard C Articulated load bearing wear pad assembly
US5158189A (en) * 1991-12-12 1992-10-27 Watson Brothers Industries, Inc. Boom support system
US5829606A (en) * 1996-03-04 1998-11-03 Kidde Industries, Inc. Device for guiding a telescopic part for a telescopic boom
DE19608210C1 (de) * 1996-03-04 1997-10-09 Kidde Ind Inc Vorrichtung zur Führung eines Teleskopteils für einen Teleskop-Ausleger
DE19741202C5 (de) * 1997-09-18 2005-04-07 Grove U.S. LLC (n.d.Ges.d.Staates Delaware) Gleitlager für Teleskopteile
US6108985A (en) * 1997-09-18 2000-08-29 Grove, U.S.L.L.C. Slide mount for telescopic parts
DE19741202C1 (de) * 1997-09-18 1998-10-22 Kidde Ind Inc Gleitlager für Teleskopteile
US20020022068A1 (en) * 1999-11-24 2002-02-21 Pierre Glaesener Flexible shoe assembly
US7461976B2 (en) * 1999-11-24 2008-12-09 Husky Injection Molding Systems Ltd. Flexible shoe assembly
GB2375753B (en) * 2001-03-24 2004-11-17 Bamford Excavators Ltd Wear pad
GB2375753A (en) * 2001-03-24 2002-11-27 Bamford Excavators Ltd Wear pad for a stabiliser leg
US20080038106A1 (en) * 2005-10-05 2008-02-14 Oshkosh Truck Corporation Mobile lift device
US7683564B2 (en) 2005-10-05 2010-03-23 Oshkosh Corporation System for monitoring load and angle for mobile lift device
US20070098536A1 (en) * 2005-10-31 2007-05-03 Kooima Roger D Extendable telescoping boom and method of manufacturing
US20090208150A1 (en) * 2008-02-20 2009-08-20 Aida Engineering, Ltd. Slide guide apparatus of press machine
US8109673B2 (en) * 2008-02-20 2012-02-07 Aida Engineering, Ltd. Slide guide apparatus of press machine
US8827559B2 (en) * 2012-08-23 2014-09-09 The Heil Co. Telescopic arm for a refuse vehicle
US10865827B2 (en) 2012-08-23 2020-12-15 The Heil Co. Telescopic arm for a refuse vehicle
US10274006B2 (en) 2012-08-23 2019-04-30 The Heil Company Telescopic arm for a refuse vehicle
US9556898B2 (en) 2012-08-23 2017-01-31 The Heil Co. Telescopic arm for a refuse vehicle
US11280368B2 (en) 2012-08-23 2022-03-22 The Heil Company Telescopic arm for a refuse vehicle
US11933352B2 (en) 2012-08-23 2024-03-19 The Heil Company Telescopic arm for a refuse vehicle
US11371346B2 (en) 2012-09-14 2022-06-28 Joy Global Underground Mining Llc Cutter head for mining machine
US11725512B2 (en) 2012-09-14 2023-08-15 Joy Global Underground Mining Llc Method for removing material from a rock wall
US10472961B2 (en) 2012-09-14 2019-11-12 Joy Global Underground Mining Llc Cutter head for mining machine
US10144584B2 (en) 2013-10-01 2018-12-04 The Curotto-Can, Llc Intermediate container for a front loading refuse container
US10415384B2 (en) 2016-01-27 2019-09-17 Joy Global Underground Mining Llc Mining machine with multiple cutter heads
US10876399B2 (en) 2016-01-27 2020-12-29 Joy Global Underground Mining Llc Mining machine with multiple cutter heads
US10876400B2 (en) 2016-08-19 2020-12-29 Joy Global Underground Mining Llc Mining machine with articulating boom and independent material handling system
US10738608B2 (en) * 2016-08-19 2020-08-11 Joy Global Underground Mining Llc Cutting device and support for same
US11939868B2 (en) 2016-08-19 2024-03-26 Joy Global Underground Mining Llc Cutting device and support for same
AU2017312142B2 (en) * 2016-08-19 2023-03-16 Joy Global Underground Mining Llc Cutting device and support for same
CN109844262A (zh) * 2016-08-19 2019-06-04 久益环球地下采矿有限责任公司 切削装置及其支撑件
US11391149B2 (en) 2016-08-19 2022-07-19 Joy Global Underground Mining Llc Mining machine with articulating boom and independent material handling system
US11613993B2 (en) 2016-08-19 2023-03-28 Joy Global Underground Mining Llc Cutting device and support for same
US10533416B2 (en) 2016-09-23 2020-01-14 Joy Global Underground Mining Llc Rock cutting device
US11598208B2 (en) 2016-09-23 2023-03-07 Joy Global Underground Mining Llc Machine supporting rock cutting device
US11846190B2 (en) 2016-09-23 2023-12-19 Joy Global Underground Mining Llc Rock cutting device
US11203930B2 (en) 2016-09-23 2021-12-21 Joy Global Underground Mining Llc Machine supporting rock cutting device
US10550693B2 (en) 2016-09-23 2020-02-04 Joy Global Underground Mining Llc Machine supporting rock cutting device
US11319754B2 (en) 2018-07-25 2022-05-03 Joy Global Underground Mining Llc Rock cutting assembly

Also Published As

Publication number Publication date
NL170121C (nl) 1982-10-01
DE2149510A1 (de) 1972-05-31
FR2113829B1 (fr) 1976-02-13
ZA714167B (en) 1972-03-29
FR2113829A1 (fr) 1972-06-30
BE770481A (fr) 1972-01-26
CA940092A (en) 1974-01-15
DE2149510B2 (de) 1973-07-12
NL7109776A (fr) 1972-05-19
ES392978A1 (es) 1975-04-16
GB1312214A (en) 1973-04-04
JPS538093B1 (fr) 1978-03-25
BR7106640D0 (pt) 1973-01-09
DE2149510C3 (de) 1974-02-14
NL170121B (nl) 1982-05-03

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Legal Events

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AS Assignment

Owner name: KIDDE, INC.,

Free format text: CHANGE OF NAME;ASSIGNOR:WALTER KIDDE & COMPANY, INC.;REEL/FRAME:005018/0200

Effective date: 19881109

AS Assignment

Owner name: KIDDE, INC., A DE CORP.

Free format text: MERGER;ASSIGNORS:KIDDE, INC., A DE CORP. (MERGED INTO);HIMP-2 INC., A DE CORP. (CHANGED TO);REEL/FRAME:005208/0890;SIGNING DATES FROM 19880402 TO 19890821

Owner name: KIDDE INDUSTRIES, INC.

Free format text: CHANGE OF NAME;ASSIGNOR:HKID 45 INC.;REEL/FRAME:005208/0907

Effective date: 19880405

Owner name: KIDDE INDUSTRIES, INC.

Free format text: CHANGE OF NAME;ASSIGNOR:BLOOM-1 INC.;REEL/FRAME:005208/0846

Effective date: 19881107