Sealed Disposable Concrete Vibrator

Abstract

A sealed disposable concrete vibrator assembly includes a hollow cylindrical main housing enclosing a shaft having an eccentric mid portion sized to rotate therewithin. Sealed bearings supporting the shaft are encased within an adaptor housing and a tip cover attached concentrically to proximal and distal ends, respectively, of the main housing. Outer surfaces of the adaptor housing and tip cover protrude into the main housing for frictional engagement therewith, while inner surfaces thereof provide channels to encase the bearings. An oil seal compressed against a flange integral to the adaptor housing prevents intrusion of contaminants. A circumvolving adaptor is coupled through the oil seal to the driven end of the shaft. The assembly may be hermetically sealed by permanent attachment of the adaptor housing and tip assembly to the main housing.

Claims

1. A sealed and disposable concrete vibrator, comprising: a main housing having open proximal and distal ends; a rotational eccentric shaft having an eccentric mid portion sized to fit within the main housing between the proximal and distal ends; a plurality of sealed bearings sized to rotationally support the rotational eccentric shaft while rotating within the main housing, the rotational eccentric shaft having a driven end and a nondriven end; a tip cover configured to frictionally engage the open distal end of the main housing at which the nondriven end of the rotational eccentric shaft is disposed within the main housing; coupling means attached to the driven end of the rotational eccentric shaft; an oil seal means disposed within the proximal end of the main housing and around the driven end of the rotational eccentric shaft between the coupling means and one of the sealed bearings; and an adaptor housing configured to accommodate the coupling means and to frictionally engage the open proximal end of the main housing.

2. The concrete vibrator of claim 1 wherein the main housing is cylindrical.

3. The concrete vibrator of claim 1 wherein the tip cover comprises an integral attachment sleeve configured to interfit with the open distal end of the main housing.

4. The concrete vibrator of claim 1 wherein the tip cover comprises a channel configured for secure engagement of one or more of the plurality of sealed bearings.

5. The concrete vibrator of claim 1 wherein the adaptor housing comprises an integral attachment sleeve configured to interfit with the open proximal end of the main housing.

6. The concrete vibrator of claim 1 wherein the adaptor housing comprises a channel configured for secure engagement of one or more of the plurality of sealed bearings.

7. The concrete vibrator of claim 1 wherein the adaptor housing comprises an oil seal flange integrally formed on the adaptor housing and configured to arrest longitudinal movement of the oil seal means.

8. The concrete vibrator of claim 1 wherein the tip cover is permanently attached to the distal end of the main housing.

9. The concrete vibrator of claim 1 wherein the adaptor housing is permanently attached to the proximal end of the main housing.

10. The concrete vibrator of claim 1 wherein one or more of the main housing, the tip cover, and the adaptor housing is formed from a hardened steel alloy.

11. The concrete vibrator of claim 1 wherein one or both of the main housing and the tip cover are encased within a plastic or elastomeric material.

12. The concrete vibrator of claim 1 wherein the main housing comprises a hollow cavity at least partially filled with a lubricating medium.

13. A sealed disposable concrete vibrator assembly, comprising: a hollow cylindrical main housing enclosing a shaft rotationally supported by bearings, the shaft having an eccentric mid portion rotatable within the main housing; an adaptor housing having a cylindrical protrusion having an outer surface configured to frictionally engage a proximal end of the main housing and having an inner surface configured to frictionally engage one or more of the bearings; a tip cover having a cylindrical protrusion having an outer surface configured to frictionally engage a distal end of the main housing and having an inner surface configured to frictionally engage one or more of the bearings; an oil seal compressed against a flange integral to the adaptor housing; and a circumvolving adaptor coupled through the oil seal to a driven end of the shaft.

14. A method for manufacturing a sealed disposable concrete vibrator, comprising steps for: providing a main housing having open proximal and distal ends; providing a tip cover having a bearing channel and having an attachment sleeve configured to frictionally engage the distal end of the main housing; fitting one or more bearings within the bearing channel of the tip cover; attaching the attachment sleeve of the tip cover to the distal end of the main housing; providing an adaptor housing having a bearing channel, and having an attachment sleeve configured to frictionally engage the proximal end of the main housing; fitting one or more bearings within the bearing channel of the adaptor housing; installing a driven end of an eccentric shaft concentrically through the one or more bearings of the adaptor housing; coupling a drive shaft adaptor to the driven end of the eccentric shaft; installing a nondriven end of the eccentric shaft within the one or more bearings of the tip cover; and attaching the attachment sleeve of the adaptor housing to the proximal end of the main housing.

15. The method of claim 14 wherein one or both of the attachment sleeve of the tip cover and the attachment sleeve of the adaptor housing comprises an integral attachment sleeve.

16. The method of claim 14 wherein the step for providing the adaptor housing further comprises providing the adaptor housing having an integral oil seal flange; wherein the method further comprises fitting an oil seal against the integral oil seal flange; and wherein the step for installing the driven end of the eccentric shaft further comprises installing the driven end of the eccentric shaft concentrically through the oil seal.

17. The method of claim 14 wherein one or both of the attaching steps comprise permanently attaching by gluing or welding.

18. The method of claim 14 wherein the step for installing the driven end of the eccentric shaft further comprises installing the driven end of the eccentric shaft concentrically through the one or more bearings of the adaptor housing.

19. The method of claim 14 wherein the step for installing the nondriven end of the eccentric shaft further comprises installing the nondriven end of the eccentric shaft concentrically within the one or more bearings of the tip cover.

20. The method of claim 14 wherein the main housing has axial symmetry with respect to a longitudinal axis and wherein, at completion of all the steps, one or more of (a) the tip cover; (b) the bearings within the bearing channel of the tip cover; (c) the adaptor housing; and (d) the bearings within the bearing channel of the adaptor housing; are concentrically aligned with the longitudinal axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a cross sectional side view of a sealed disposable concrete vibrator according to one embodiment of the present invention.

[0016] FIG. 2 is a flow chart showing salient steps in a method for manufacturing a sealed disposable concrete vibrator according to one embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0017] While the presently disclosed inventive concepts are susceptible to various modifications and alternative constructions, certain illustrated embodiments thereof have been shown in the drawings and will be described below in detail. It should be understood, however, that there is no intention to limit the inventive concepts to the specific form disclosed, but, on the contrary, the presently disclosed and claimed inventive concepts are to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the inventive concepts as defined in the claims.

[0018] FIG. 1 shows a sectional representation of a side view of our new sealed disposable concrete vibrator 10. Provided is a main housing 12, which, in the preferred embodiment, is of hollow cylindrical form open at both proximal and distal ends. Main housing 12 may be formed either from a casting or from a fabricated metal tube and may be provided with a distal end machined inner surface 14 sized to frictionally engage, or interfit, with attachment sleeve 32 of tip cover 18. Main housing 12 is also provided with a proximal end machined inner surface 16 at the proximal end (or driven end) of main housing 12, which proximal end machined inner surface 16 is sized to frictionally receive and hold an attachment sleeve 34 of an adaptor housing 20. Accordingly, tip cover 18 and its attachment sleeve 32 are sized for frictional engagement with the distal opening of main housing 12, such that attachment sleeve 32 interfits, or sealingly engages, within distal end machined inner surface 14. In one embodiment, tip cover 18 may be permanently attached to the main housing 12 along the interface of attachment sleeve 32 and machined inner surface 14 by means of a suitable adhesive or glue, or even something as simple as an adhesive formulation of the type marketed by Loctite. In another embodiment, the tip cover 13 may be permanently attached to main housing 12 by welding.

[0019] When the concrete vibrating assembly 10 is fully assembled, as shown in FIG. 1, the interior longitudinal centerlines of main housing 12, tip cover 18 and adaptor housing 20 are preferably in axial alignment with one another and with the bearing surfaces of eccentric shaft 26. When these components are so aligned, they are said to be concentrically installed or concentrically aligned, with that alignment being along an imaginary longitudinal axis running through the center of the main housing 12. Preferably, main housing 12 has axial symmetry about the longitudinal axis.

[0020] Eccentric shaft 26 may be a shaft of well known design that inherently out of balance when rotating and thus able to impart a vibration to concrete vibrating assembly 10 when rotating. A pair of proximal end sealed bearings 22 frictionally engage a channel configured to securely hold the bearings, the channel formed in space between the machined inner surface of adaptor housing attachment sleeve 34, so that the bearings 22 support the driven end 23 of the rotating eccentric shaft 26. A pair of distal end sealed bearings 22 frictionally engage a similar channel formed in space between the machined inner surface of tip cover attachment sleeve 32, so that the bearings 22 support the nondriven end 24 of rotating eccentric shaft 26. In a like manner to the tip cover 18, the adaptor housing attachment sleeve 34 of adaptor housing 20 is provided with an outer surface that frictionally engages with machined surface 16 formed in the proximal end of main housing 12, and which may be sealingly attached to machine surface 16 by gluing or welding.

[0021] Rotating eccentric shaft 26 may be manufactured from machined steel, may be forged or cast or formed from powdered metal materials or a composite, depending upon model design. The main housing 12 and tip cover 18 are typically hardened to extend life. In a preferred embodiment, the main housing 12 and the outer surface of the tip cover 18 are encased in plastic or a rubber-like material 19 so that the concrete vibrating assembly 10 may be used with plastic coating rebar applications without damaging or stripping away the plastic coating on the rebar. In another embodiment, the hollow cavity of main housing 12 may be completely or at least partially filled with a lubricating medium 27, such as grease, oil, graphite, or the like.

[0022] As shown in FIG. 1, the adapter housing 20 is configured to accommodate a flexible drive shaft adaptor 29. The flexible drive shaft adaptor 29 may be provided as a means for coupling a prime mover, such as an electric motor, to the driven end of rotating eccentric shaft 26, to thereby circumvolve the shaft. The specific design of adaptor housing 20 may therefore vary depending upon the flexible drive shaft interface intended to be used with a particular concrete vibrator assembly 10. Similarly, the design features of the flexible drive shaft adaptor 30 may depend on the design of the eccentric drive shaft to which the adaptor is intended to be connected.

[0023] In one embodiment, an oil seal 28 is installed between one or more sealed bearings 22 and an oil seal flange 25. Preferably, the oil seal flange 25 is integrally formed on the adaptor housing 20 so that it will arrest longitudinal movement of the oil seal 28 in a proximal direction. Properly installed, longitudinal movement of the oil seal 28 in a distal direction will be arrested by bearings 22. Oil seal 28 is made of suitable dimensions and materials to seal the vibrator 10 to prevent contamination during rotation of eccentric shaft 26, and when immersed in concrete, and to prevent leakage of the lubricating medium 27.

[0024] In view of the foregoing descriptions, one skilled in the relevant art will recognize that the present invention may be expressed as a sealed disposable concrete vibrator assembly that includes a hollow cylindrical main housing enclosing a shaft rotationally supported by bearings, wherein the shaft has an eccentric mid portion rotatable within the main housing. In addition, the vibrator assembly includes an adaptor housing having a cylindrical protrusion having an outer surface configured to frictionally engage a proximal end of the main housing and having an inner surface configured to frictionally engage one or more of the bearings. In addition, the vibrator assembly includes a tip cover having a cylindrical protrusion having an outer surface configured to frictionally engage a distal end of the main housing and having an inner surface configured to frictionally engage one or more of the bearings. In addition, the vibrator assembly includes an oil seal compressed against a flange integral to the adaptor housing, and a circumvolving adaptor coupled through the oil seal to a driven end of the shaft. According to the invention, frictional engagement of the adaptor housing to the main housing, and/or frictional engagement of the tip cover to the main housing, closes open end(s) of the main housing and reliably seals the hollow interior of the main housing against intrusion of foreign material. The engagement of the adaptor housing and tip cover may be effected by press-fitting alone, or it may also include bonding the adaptor housing and tip cover to the main housing by a permanent attachment means such as gluing or welding, to create a hermetic seal.

[0025] FIG. 2 shows a flow chart that illustrates salient steps in a method 30 for manufacturing a sealed disposable concrete vibrator 10 according to one embodiment of the invention. The steps of method 30 may be performed in any order desired, as the invention does not restrict performance of the method to the precise order of steps shown.

[0026] With the foregoing description of the vibrator 10 in mind, the salient steps of method 30 are expressed as follows: In an initial step 31, a main housing is provided for the vibrator assembly. The main housing is provided with open proximal and distal ends, and may consist of a cylinder such as a pipe section. Next, step 32 requires providing a tip cover having a bearing channel and having an attachment sleeve configured to frictionally engage the distal end of the main housing. During performance of this step, the attachment sleeve of the tip cover may be integrally formed on the tip cover. The next step 33 requires fitting one or more bearings within the bearing channel of the tip cover. The next step 34 requires bonding the attachment sleeve of the tip cover to the distal end of the main housing. The bond may be made permanent by gluing or welding. In the next step 35, an adaptor housing is provided having a bearing channel and having an attachment sleeve configured to frictionally engage the proximal end of the main housing. During performance of this step, the attachment sleeve of the adaptor housing may be integrally formed on the adaptor housing. Next, in step 36, one or more bearings are fitted within the bearing channel of the adaptor housing. Next, step 37 requires installing a driven end of an eccentric shaft through the one or more bearings of the adaptor housing. Preferably, in this step the driven end of the shaft is installed so that the eccentric shaft and the bearings are concentrically aligned with the adaptor housing. Next, in step 38, a drive shaft adaptor is coupled to the driven end of the eccentric shaft. Next, in step 39, a nondriven end of the eccentric shaft is installed within the one or more bearings of the tip cover, preferably so that the eccentric shaft and the bearings are concentrically aligned with the tip cover. In the final step 40, the attachment sleeve of the adaptor housing is bonded to the proximal end of the main housing. The bond may be made permanent by gluing or welding.

[0027] A method according to the invention may be performed by supplementing method 30 with additional steps derived from the foregoing disclosure, though such supplemental steps may not be expressly called out in a process step of the flow chart. For example, additional steps in a method according to the present invention may include: providing the adaptor housing having an integral oil seal flange, fitting an oil seal against the integral oil seal flange, and installing the driven end of the eccentric shaft concentrically through the oil seal.

[0028] As can be seen in the preferred embodiment, the machining steps necessary to create a sealed concrete vibrator are minimal, thus greatly reducing the cost and ultimate sale price of concrete vibrator assembly 10. It has also been found that a sealed disposable concrete vibrator assembly of the present invention, though of relatively simple and rugged design, has just as long a service life as the much more expensive disassembleable concrete vibrators known in the prior art and that the cost savings realized, when taken together with the avoided cost of replacement bearings and labor to rebuild a more expensive concrete vibrator, more than economically justify the use of the disposable concrete vibrator assembly 10 of the present invention.

[0029] While certain preferred embodiments are shown in the figures and described in this disclosure, it is to be distinctly understood that the presently disclosed inventive concepts are not limited thereto but may be variously embodied to practice within the scope of the following claims. From the foregoing description, it will be apparent that various changes may be made without departing from the spirit and scope of the disclosure as defined by the following claims.