US1829441A - Vibrator - Google Patents

Description

Oct. 27, 1931. E. FICKETT ET AL 1,829,441

VIBRATOR Filed Nov. 25, 1929 2 Sheets-Sheet 2 flvew/ 1. Wake 22 FT/751mm, V f

latenterl Oct. 27, 1931 UNlTE DQST-ATES PATENT? OFFICE ERNEST L. FICKETT; F FITCH-BURG, MASSACHUSETTS, AND ALBERT W. MUNSELL,OI' TEA-NECK, NEWERSEY, ASSIGNORS, BY ASSIGNMENTS, T0 SAID ALBERT W.

MUN SELL vmne'ron Application filed November 25, 1929. Serial No. 409,475.

This invention relates to a vibrator particularly adapted for tamping concrete by vibration and also capable of use for tamping and consolidating other materials, such as molding sand and the like.

The main object of this invention is to provide an effective means for causing the concrete or other granular material to flow into the corners and an les of the forms, patterns the like in which it is enclosed and to completely imbed any reinforcing steel that may be present by consolidation of the aggregates and cement by the operation of vibration or jarring; also to drive 03 any excess Water or release any entrained air so as to settle th granular material into its densest condition and make it as near as possible an absolute solid and to provide a mechanism adapted to act by compressed air or other fluid to produce rapid vibrations by the utilization of a rotor mounted to rotate on an axis and having its center of gravity arranged eccentrically.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. l is an end view of adevice constructed in accordance with this invention showing the principal parts in section on a plane transverse to the axis of rotation of the rotor;

Fig. 2 is a side view of the same;

Fig. 3 is a sectional view on the line 33 of Fig. 1;

Fig. 4: is a sectional view on the line 44 of Fig. 2;

Figs. 5, 6 and 7 are sectional views through the casing but showing the rotor in elevation and in three different positions, and

Fig. 8 is a plan showing one way of applying the vibrator to a concrete form.

The machine itself, as shown, comprises a tamper foot 10 attached by a suitable length of pipe 11 to a main casing or frame 12. Into the top of this casing extends a pipe 13 through which compressed air or other operating fluid can be introduced. The air enters the casing 12 in what may be considered two passages 14 and 15. The passage 14: ap-

plies the pressure of the actuating fluid at; all

times, and of course directly, to a sliding abutment 16. Through the passage 15 the air enters a space or chamber 17in theinterior of the casing, which is shown circular and preferably cylindrical in form. In this casing is the rotor 18 mounted torotate on a shaft 19 which is centrally located in i the chamber 17 but the rotor is eccentricallylocated therein so that it will substantially contact with the surface ofthespace 17 at one point, advancing around the same as the rotor rotates. For the purpose of enablingthe rotor to lVOlWe freelyand maintain alignment it-is provided with an anti-friction bearing 20 on the shaft '19.

It will be observed that on account of the air pressure on the abutment 16, itwill be kept in contact with the rotor by yielding but strong pressure at all times. The passage or port 15 is the admission port. The exhaust port 22 is provided on the opposite side of the abutment valve 16. An oil reservoir 23 is also provided in the casing 12 which is filled and closed by any suitable means such as a pipe plug. The oil in this reservoir is transferredto the inlet passage 15 and regulated by a needle valve 24 so as to follow all around the parts that have been described.

The device can be used in two ways. It can be manually operated, so to speak, by holding it in the hands with the-tamper foot 10 against the-concrete forum-mold, blank, or the like. On the other hand the casing 12 is shown as provided with serrations 25 along one side and the casing is clamped against the structure of the form containing the concrete or the like in such position that the points of the serrations impinge on a wooden member thereof. Rods or other suitable clamps 26 are passed through holes 27 in a pair of opposite cover plates 28 and attached to the concrete form in any desired way. Then the vibrations produced by the rotor will be transmitted directly and positively without holding the machine manually.

The operationwill be understood byreference to Figs. '5, 6 and 7. In the position shownin-Fig. 5 air is being admitted through the intake portand is pressing on the abutment va-lve, of course, at all times. Therefore it will be seen thatno air can pass in a face but eccentrically located thereon and counter-clockwise 7 through the exhaust port; The space on the direction and escape exhaustside is. all open through the exhaust portto-atmospheric air. The rotor. clears the inside of the inner wall of the space 17 vby a few thousandths of an inchand being lubricated, itpractically touches it. Nowthe air presses in all directions and the 'efiective surface of the rotor in the small space at the right of the abutment valve 16 is presented at right angles to the axis of the shaft 19 upon which surface theair pressure is free to act, thereby producing a-turning moment onthe rotor.

When the parts get to, the position shown in V Fig. 6 this moment 'isincreased. It is still having its edge, at the greatest distance from its center of rotation, substantially in contact withthe wall of the chamber, whereby the rotor initsrrotation moves'toward and from said surface, an abutment in contact with the rotor to prevent passage of fluid backwardly around it and means for, introducing'fluidabutment under pressure on one side .of the for turning'the rotor.

' y In testimony whereof we have hereunto affixed our signatures. v

j V ERNEST .L. FICKE'TT MUNSELL.

present in the positionshown" in Fig.5 7 7 Therefore the rotorwill operate until itcomes 1 to a dead center and the parts are so designed i that the rotor will have suiiicient inertia to V carryit over the dead center and then the process is repeated. Of course, when the rotor r haust port-is beginning to open to allow the air to escape thathas been used in running is on the intake side; This is'a deadcenter.

therotor and practically" no projecting areao I "If the device is stopped atthi's point itis necessary to jar it from the outsideso that therotor willfall into a'position bygravity' V from which it can be started again. .The 1 r center of mass of the rotor is outside its center of rotat on. In other words 1t 1s an eccentric.

Therefore the desiredyibrations are produced V and transmitted to the article upon which it is operating. 1

' This constitutesa very simple deyiceout anymoving inlet or outlet Valves except for the granular'material as desired; It is readily portable; Ordinarilywit is used in erticalposition as shown but that is not essentiaL- i Q j Although we have illustrated anddescribed onlya single form of the invention and two ways 'of'using it, we are aware of the'fact that modifications can be made therein by any per- 7 v sonskilled in the art without departingafrom 7 7 combination-of a casing having serrations limited {in the scope of the invention as expressed in the: claim; ;Therefore we do not wish to be thisrespectbut what .:we do In a' vibrator for thepurpose des'cribed,the f along one side, meansforsecuring the casing to the surface of 'a concrete form and forcing the serrations into said surface-for transs 7 V mitting the motion of the casi'n thereto,'said V cas ng ha-Vmgja c rcular'cham ertherein, a

rotor mounted to -rotate about aihorizontal l '7 axis in, saidchamber parallel with said suri

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