US3549130A - Concrete vibrator - Google Patents
Concrete vibrator Download PDFInfo
- Publication number
- US3549130A US3549130A US726761A US3549130DA US3549130A US 3549130 A US3549130 A US 3549130A US 726761 A US726761 A US 726761A US 3549130D A US3549130D A US 3549130DA US 3549130 A US3549130 A US 3549130A
- Authority
- US
- United States
- Prior art keywords
- housing
- vibrator
- concrete
- face
- cylindrical
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
- E04G21/08—Internal vibrators, e.g. needle vibrators
Definitions
- a concrete vibrator has an elongated extruded thin-walled housing which encloses a rotatably driven eccen- [54] CONCREIE fi g tric weight of circular cross section, and the outer surface of 9 Claims Draw 8 the housing is formed by a plurality of peripherally spaced and 259/1 longitudinally extending concaved faces which are effective to B0lfll/00 produce concentrated forces within the concrete adjacent [50] Field of Search 259/1 each face with minimum slippage between each face and the (Vib. Mech.), (Vib. Electra); 74/87 adjacent concrete.
- a housing having a square shaped outer crosssectional configuration and a cylindrical housing having longitudinally-extending external ribs have been used since the flat sides of the housing or the ribs will impart somewhat greater thrust-to the concrete during the highspeed orbital movement of the housing than will a cylindrical housing.
- the present invention is directed'to an improved concrete vibrator which incorporates a housinghavingan outer surface formed by a plurality of peripherally spaced and longitudinally extending concaved faces which cooperate to impart energy or thrust tothe adjacent concreteduring substantially the entire orbital path of travel of each face. That is, the high-speed orbital movement of each concaved face causes the adjacent portion of the concrete to travel in acorresponding orbital path with minimum slippage between the concrete and the face so that the voids or air pockets in the concrete are rapidly filled.
- the concrete vibrator of the present invention also incorporates a novel extruding housing of relatively low mass thereby enabling a reduction in the mass of the rotor or eccentric weight required for orbiting the housing at a predetermined arnplitude.
- low mass needle bearings are used to support the rotor and as a result of the lower mass of the rotor, the bearings are subjected to'lower stresses thus extending the service life of the bearings.
- the relative low mass of the housing and other nonrotating parts also permits a correspondingly greater amplitude in orbital movement with the same rotor. and rotor speed, thus imparting a higher proportion of energy into the concrete.
- the extruded housing may be formed of aluminum, titanium, steel or other suitable materials, and if formed of soft material such as aluminum, it is coatedwith a suitable hard coating.
- the extruded construction of the present invention permits a thin walled housing in regions where there is very little wear due to abrasion.
- FIG. 1 shows a concrete vibrator constructed in accordance with the invention and having a portion shown in axial section as taken on the line 14 of FIG. 2;
- FIG. 2 is a transverse section taken generally along the line
- FIG. 3 is an enlarged fragmentary transverse section of the housing shown in FIGS. 1 and 2 and illustrating the converging forces exerted on the concrete adjacent each face of the housing; and
- FIG. 4 is a fragmentary section through a modified form of the vibrator housing.
- the housing 15 is formed as a thin wall steel extrusion.
- the housing 15 has an outer surface fonned by peripherally spaced and longitudinally extending concave faces each of which has a radius R corresponding generally to the diameter D of a circle inscribingthe housing.
- the uniformly spaced concaved faces '25 Warii I to form peripherally spaced, longitudinally extending noses 28 which are slightly rounded.
- the noses 28 have radii of curvature which are small compared to the radii of curvature of the concave faces 25.
- a rotor 30 is rotatably supported within the housing 15 and includes a cylindrical eccentrically disposed weight portion 32 extending within the bore 16, and connecting cylindrical journal portions 33 and 34 defining an axis of rotation offset or eccentric to the axis of the weight portion 32.
- a cap 35 is threaded into the end portion 19.of the housing 15 and includes a cylindrical portion 36 which seats on the cylindrical surface 17 and provides aninternal cylindrical bore 31 for retaining an antifriction needle bearing 40 mounted on the journal portion 33 of the rotor 30.
- a stud 41 is pressed-fitted into a hole 42 formed within the end of the journal portion 33 and has a hardened head 44 which engages a hardened steel ball thrust bearing 45 confined within a conical shaped cavity 46 formed within the cap 35.
- a tubular coupling 50 is threaded into the opposite end of the housing 15 and has a cylindricalpor'tion 51 which seats on the surface 18 and defines a cylindrical bore 52 for receiving another antifriction needle bearing 40 mounted on the journal portion 34 of the rotor 30.
- An annular resilient seal 55 is also positioned within the bore 52 adjacent a radial shoulder 56 and engages the journal portion 34 to confine a predetermined quantity of oil placed within the housing 15 during assembly portion 68 formed as an integral part of the rotor 30.
- a crosspin 70 rigidly connects the coupling 65 to the rotor drive portion 68 and thereby transmits the driving torque from the shaft assembly 59 to the rotor 30.
- An annular felt washer 71 surrounds the shaft coupling 65 and serves to prevent dirt and other foreign matter from coming in contact with the oil seal 55.
- FIG. 3 shows the lines of force which are imparted by the housing 15 into the concrete material.
- the housing 15 moves in a correspondingly high-speed orbital path.
- Each concave outer surface 25 in turn produces the generally radially converging forces F on and within the adjacent concrete.
- the concave curvature of the faces 25 serve to prevent the escape of concrete, as compared to a head in which the surface is of cylindrical shape, ribbed cylindrical, or flat.
- the surfaces 25 operate somewhat in the manner of the curved blades of a Pelton-type' turbine wheel,
- the thin steel extruded housing also provides several important advantages.
- the construction is one in which a relatively thin wall is formed, as indicated by the arrows 75, in the regions of minimum thickness centrally of each face 25.
- a thin wall is possible at 75 since abrasive ,wear tends to be concentrated at the noses 28 where the housing wall is the thickest. The wear is the least at 75 where the wall is the thinnest.
- a "pencil” type vibrator housing constructed according to this invention with seven faces 25 of equal size and uniform angular spacing, had a radius R of curvature of each face of l 1% inches, while the diameter D of an inscribing circle was 1 as inches.
- the minimum wall thickness as measured at 75 was 0.078 inches.
- the minimum wall thickness at 75 is preferably one-tenth inch or less. This is substantially less than the wall thickness of a conventional 1 A inches diameter cylindrical machined steel housing, which .may be approximately 0.15 inch.
- the minimum wall thickness, as defined above, does not necessarily increase with increases in the diameter of the vibrator housing. For example, in larger vibrators using housing of an inscribed circle diameter D of '2 3 4 inches or more, the minimum wall thickness 75 in the extruded steel housing would remain preferably one-tenth inch or less.
- the wall thickness can be increased to provide sufficient strength without increasing the overall weight of the housing, since aluminum weighs approximately one third as much as steel.
- the housing of the present invention represents a 36 percent reduction in housing weight over the corresponding conventional housing. Further reductions in i the overall weight may be realized by the fact that the support bearings 40 are of needle construction, which is possible since the loading on these bearings has been reduced in accordance l with reduction of housing weight. In addition, an increase in the life of the support bearings 40 is made possible due to the lower working stresses.
- Such coatings can provide a satisfactory hard and wear resistant surface, and may have a Rockwell hardness preferred due to the relatively lower cost of fabrication as compared to the steel extrusion of FIGS. 1 and 2 and to the possibility of further weight reduction.
- titanium may be used in place of aluminum in which event coating would not be necessary due to the toughness of that material.
- the pencil-type" vibrator shown in FIG. 1 is particularly adapted for use between concrete forms, where the space due to the presence of reinforcing rods and the like may be limited. It is thus a mater matter of importance that the vibrator efficiently and thoroughly pack the concrete into the spaces available.
- the high energy output of the vibrator of the present invention is of particular. advantage, where space is limited and where it is not always possible to insertthe vibrator head into many different positions within the form.
- An improved vibrator for compacting concrete material and the like comprising an elongated tubular extrusion forming a housing having a uniform cross-sectional configuration substantially throughout its length, said housing further having an outer surface formed by at least seven peripherally spaced and longitudinally extending concave faces, an eccentric weight rotatably supported within said housing, closure means on one end of said housing, and drive means connected to said weight through the other end of said housing for imparting orbital movement to each said face and to effect uniformly concentrated converging forces from each said face to the adjacent material and to channel an upward flow of material adjacent each said face.
- each said face has a constant radius of curvature approximately equal to the diameter of a circle circumscribing said housing.
- a vibrator as defined in claim 1 including a set of antifriction needle bearings positioned within said housing and rotatably supporting said weight.
- a vibrator as defined in claim 1 wherein the adjacent said faces of said housing are joined by a longitudinally extending nose surface of small radius relative to the radius of each said face.
- An improved vibrator for compacting concrete material and the like comprising an elongated tubular housing, an eccentric weight member positioned within said housing, a set of antifriction cylindrical roller bearings supporting said weight member for rotation, closure means on one end of said housing, a hardened insert mounted within the end of said weight member adjacent said closure means, a thrust bearing mounted on said closure means and engaging said insert,said housing having a plurality of peripherally spaced and longitudinally extending smoothly curved concave faces formingits outer surface, and drive means connected to said weight through the other end of said housing for rotating said weight and imparting orbital movement to each said face to effect concentrated converging forces from each face to adjacent material and to channel an upward flow of material adjacent each said face.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US72676168A | 1968-05-06 | 1968-05-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3549130A true US3549130A (en) | 1970-12-22 |
Family
ID=24919900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US726761A Expired - Lifetime US3549130A (en) | 1968-05-06 | 1968-05-06 | Concrete vibrator |
Country Status (4)
Country | Link |
---|---|
US (1) | US3549130A (de) |
DE (1) | DE1922764A1 (de) |
FR (1) | FR2007941A1 (de) |
GB (1) | GB1253622A (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013034247A1 (de) * | 2011-09-08 | 2013-03-14 | Wacker Neuson Produktion GmbH & Co. KG | Innenrüttelvorrichtung mit kunststoffbeschichtetem leichtmetallvibrationskörper |
WO2019136088A1 (en) * | 2018-01-03 | 2019-07-11 | Minnich Manufacturing Company, Inc. | Speed control concrete vibrator with endcaps |
USD1000927S1 (en) | 2021-04-22 | 2023-10-10 | Milwaukee Electric Tool Corporation | Concrete vibrator |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116607780B (zh) * | 2023-07-18 | 2023-10-03 | 佛山市云雀振动器有限公司 | 一种振动可调的混凝土振动器及使用方法 |
-
1968
- 1968-05-06 US US726761A patent/US3549130A/en not_active Expired - Lifetime
-
1969
- 1969-05-05 DE DE19691922764 patent/DE1922764A1/de active Pending
- 1969-05-06 GB GB23159/69A patent/GB1253622A/en not_active Expired
- 1969-05-06 FR FR6914491A patent/FR2007941A1/fr not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013034247A1 (de) * | 2011-09-08 | 2013-03-14 | Wacker Neuson Produktion GmbH & Co. KG | Innenrüttelvorrichtung mit kunststoffbeschichtetem leichtmetallvibrationskörper |
WO2019136088A1 (en) * | 2018-01-03 | 2019-07-11 | Minnich Manufacturing Company, Inc. | Speed control concrete vibrator with endcaps |
US11025125B2 (en) | 2018-01-03 | 2021-06-01 | Minnich Manufacturing Company, Inc. | Concrete vibrator with endcaps |
US12068657B2 (en) | 2018-01-03 | 2024-08-20 | Minnich Manufacturing Company, Inc. | Speed control concrete vibrator |
USD1000927S1 (en) | 2021-04-22 | 2023-10-10 | Milwaukee Electric Tool Corporation | Concrete vibrator |
Also Published As
Publication number | Publication date |
---|---|
FR2007941A1 (de) | 1970-01-16 |
GB1253622A (en) | 1971-11-17 |
DE1922764A1 (de) | 1969-11-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KOEHRING COMPANY 200 EXECUTIVE DRIVE, BROOFIELD, W Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOEHRING COMPANY A WI CORP.;REEL/FRAME:003995/0514 Effective date: 19810505 |
|
AS | Assignment |
Owner name: BT COMMERCIAL CORPORATION 233 SOUTH WACKER DRIVE C Free format text: SECURITY INTEREST;ASSIGNOR:MASTER CONSOLIDATED CORPORATION A CORP. OF OH;REEL/FRAME:004275/0009 Effective date: 19840510 |
|
AS | Assignment |
Owner name: BT COMMERICAL CORPORATION, 233 SOUTH WACKER DRIVE, Free format text: SECURITY INTEREST;ASSIGNOR:MASTER CONSOLIDATED CORPORATION, DEBTOR-IN-POSSESSION;REEL/FRAME:004358/0115 Effective date: 19841019 |
|
AS | Assignment |
Owner name: ARROW MASTER, INCORPORATED 1201 SEVENTH STREET, EA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MASTER CONSOLIDATED CORPORATION, A CORP. OF OH;REEL/FRAME:004533/0739 Effective date: 19860317 |
|
AS | Assignment |
Owner name: MANUFACTURERS HANOVER COMMERCIAL CORPORATION, A DE Free format text: SECURITY INTEREST;ASSIGNOR:ARROW-MASTER INCORPORATED, AN IL CORP;REEL/FRAME:004594/0290 Effective date: 19860515 |
|
AS | Assignment |
Owner name: SANWA BUSINESS CREDIT CORPORATION, ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:ARROW-MASTER, INCORPORATED;REEL/FRAME:004851/0571 Effective date: 19870930 Owner name: SANWA BUSINESS CREDIT CORPORATION, 1 SOUTH WACKER Free format text: SECURITY INTEREST;ASSIGNOR:ARROW-MASTER, INCORPORATED;REEL/FRAME:004851/0571 Effective date: 19870930 |
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AS | Assignment |
Owner name: EXCHANGE NATIONAL BANK OF CHICAGO, 120 SOUTH LASAL Free format text: SECURITY INTEREST;ASSIGNOR:ARROW-MASTER, INCORPORATED, AN IL CORP.;REEL/FRAME:005674/0056 Effective date: 19900918 |