Patent Application
20050023015
The present invention relates to tool positioners, and more particularly to a jackhammer positioner with enhanced versatility and manoeuvrability features.
A jackhammer is a very heavy tool used to break concrete structures apart for performing maintenance or repair tasks thereon. It is difficult, not to say impossible, to use jackhammers other than on the ground without mechanical assistance; for instance, it would be impossible for a construction worker to manually uplift a jackhammer and to maintain it in an uplifted position, in order to apply its operative tip on an overhanging upright wall and use the jackhammer thereon. Despite this fact, jackhammers must be sometimes used on surfaces other than ground surfaces. For example, the bottom concrete surface of bridges, outdoors concrete ceilings, upright concrete walls of a given structure, are all surfaces which may require maintenance or repair interventions with a jackhammer. In order to assist a construction worker in supporting over ground and positioning the jackhammer in a desired position, it known to use jackhammer positioners. However, existing jackhammer positioners are cumbersome, inefficient and their versatility tends to be limited.
The invention relates to a jackhammer positioner for assisting a worker in the over ground handling of a jackhammer, comprising:
In one embodiment, said base is pivotally mounted onto said ground is support member.
In one embodiment, the range of reach of said jackhammer support member sweeps a volume represented by a virtual half sphere with said base forming approximately the center of said half sphere.
In one embodiment, said positioner further comprises control means operatively connected to and controlling said power means.
The invention also relates to an articulated support member for assisting a worker in the over ground handling of a jackhammer having a main body and a hammering head at one end of the main body thereof, said support member comprising:
In one embodiment, said second mounting means includes means for anchoring the jackhammer main body at the center of gravity thereof.
In one embodiment, said manual command and control template includes means for remote control of said power means.
In one embodiment, said articulated support member further includes translational motion means, integral to said main frame of said command and control unit for relative movement of said jackhammer attachment assembly relative to said manual command and control template.
In one embodiment, said articulated support member further includes second power means, operatively connected to said manual command and control template for selectively powering the jackhammer head in a reciprocating motion.
In one embodiment, said first mounting means includes a turntable rotatably supporting said arm inner end about an axis transverse to said turntable.
In one embodiment, said base means includes a lift platform movable vertically over ground.
In one embodiment, said first mounting means includes a turntable fixedly secured to said lift platform and rotatably supporting said arm inner end about an axis transverse to said turntable.
In one embodiment, said first mounting means includes:
In one embodiment, wherein said turntable includes a central axle with low-friction PTFE coating.
The invention also relates to a jackhammer device comprising:
In the annexed drawings:
In
Positioner 10 can be installed on a platform 1. Platform 1 is for example attached to a lifting mechanism of a utility vehicle (not shown), and can thereby be vertically raised under the action of the lifting mechanism. In one embodiment, a rail 6 is fixedly attached to platform 1, rail 6 comprising a horizontal sheet-like elongated track 6a, and three brackets 6b lengthwisely spaced apart along and integrally attached to track 6a. Brackets 6b are affixed to platform 1, and rail 6 is thus attached to platform 1, with plate 6b being in a spaced apart and overhanging parallel relationship with platform 1.
Jackhammer positioner 10 is slidably mounted onto rail 6 of platform 1, as described hereinafter. As shown in
Support structure 12 is slidably mounted onto rail 6. Indeed, wheels 16, 16′ slidably engage the top edge of track 6a of rail 6, and wheels 17, 17′ slidably engage the lower edge of track 6a of rail 6. Support structure 12 can thereby be linearly slid along track 6a of rail 6.
Jackhammer positioner 10 further comprises a base 20, base 20 comprising a transverse axle 22 fixedly attached at the center thereof. Base 20 has a circular shape, and can be made of steel for example. Axle 22 engages bushing 18 of one beam 14 of support structure 12, and base 20 is thereby pivotally mounted thereon. In the appended figures, base 20 engages the beam 14 which is the furthest from beams 15, 15′. However, base 20 can be interchangeably mounted on either one of beams 14.
An annular washer 23, which can be coated with a friction reducing compound such as polytetrafluoroethylene (PTFE or Teflon(g), is fitted over the top edge of bushing 18 and beneath base 20. When base 20 is pivoted about its pivotal engagement with beam 14, the bottom surface of base 20 will slide with low friction onto PTFE washer 23, and axle 22 will slide against bronze sleeve 21. The pivotal movement of base 20 relative to bushing 18 is hence carried out without being excessively impeded by friction-borne forces.
As shown in
A pivot actuator 24 is pivotally connected at one end 24A to foot 20-1, and is pivotally connected at the other end 24B to an intermediate section of arm portion 32. Actuator 24 can be a hydraulic or pneumatic cylinder, and is operatively connected to and controlled manually by control handles, as described hereinafter. Upon activation of actuator 24, arm 30 is pivoted about its pivotal joint with foot 20-1 between two limit positions: a first limit position, where arm portion 32 is substantially vertical and where actuator 24 is retracted, and a second limit position where arm portion 32 is pivoted downwardly into a substantially horizontal position, and where actuator 24 is extracted.
Similarly, a pivot actuator 26 is pivotally connected at one end 26A to an intermediate portion of arm portion 32, and is pivotally connected at another end 26B to an intermediate section of arm portion 34. Pivotal mount 26A is distally located compared to pivot mount 24B relative to base 20. Actuator 26 can be a hydraulic or pneumatic cylinder, and is operatively connected to and controlled by control handles, as described hereinafter. Upon activation of actuator 26, arm portion 34 is pivoted at pivotal mount 32B relative to arm portion 32 between two limit positions: a first limit position, where arm portion 34 is coaxially aligned with arm portion 32, and where actuator 26 is extracted, and a second limit position where arm portion 34 forms a large acute angle with arm portion 32, for example a 60° angle, and where actuator 26 is retracted.
Arm portion 34 integrally comprises an inner portion 38, and an attachment outer end portion 36 integrally extending from fore portion 38 in an elbowed fashion. Outer end portion 36 defines a pivot axis 37, and further comprises a cross-sectionally circular pivot pin 39 integrally axially extending from elbowed portion 36. Moreover, positioner 10 comprises a yoke 40 pivotally connected to end portion 36. As illustrated in
Yoke 40 pivotally carries a jackhammer control mechanism 50 defining a longitudinal axis 51. Mechanism 50 comprises a planar grip plate 52 defining two opposite fingers 55, 55′ laterally extending from one end thereof transversely and away from axis 51. Grip plate 52 defines a grip opening 53 recessed therethrough, whereby a workman using positioner 10 can insert his hand and hang on to displace grip plate 52. Control bars 54, 54′ integrally and co-extensively extend from both faces of plate 52, perpendicularly to planar plate 52 and parallel to longitudinal axis 51. A control handle 56, 56′ is provided at the free end of each control bar 54, 54′ respectively. Handles 56, 56′ are operatively connected to and control the activation actuators 24 and 26. Mechanism 50 further comprises a rod attachment plate 58 integrally attached to grip plate 52 perpendicularly thereto and to longitudinal axis 51. Control mechanism 50 also comprises two elongated rods 60, 60′ fixedly attached at one end thereof to attachment plate 58. Rods 60, 60′ are parallel, transversely spaced apart and symmetrically arranged relative to axis 51.
Rods 60, 60′ are slidably connected to a jackhammer attachment member 62. Attachment member 62 comprises two cylindrical hollow guides 64, 64′, each guide 64, 64′ being engaged by a corresponding registering rod 60, 60′ respectively. Guides 64, 64′ are closed at one end. The engagement between rods 60, 60′ and guides 64, 64′ is a translation joint, and rods 60, 60′ can thereby be axially slid along guides 64, 64′. Anti-egress means (not shown) should be provided within guides 64, 64′, on rod 60, 60′, or both, to prevent rods 60, 60′ from accidentally egressing from guides 64, 64′ respectively. A pivot node 70, 70′ is provided on each guide 64, 64′ respectively, and a pivot axis 71 extending between pivot nodes 70, 70′ is defined. Each leg 42, 42′ of yoke 40 is pivotally attached to a corresponding pivot node 70, 70′, and mechanism 50 can thereby be pivoted about axis 71.
Pivot nodes 70, 70′ are suitably positioned on mechanism 50 in order for the weight of jackhammer control mechanism 50 to be evenly distributed half and half on opposite sides of pivot axis 71. As a result, a workman can easily pivot mechanism 50 about axis 71, and can easily maintain it in a desired position without excessive effort.
Attachment member 62 also comprises a hollow cylindrical neck 66 coaxially carrying jackhammer 5. The main body of jackhammer 5 is partially engaged by and secured to neck 66, and the elongated operative free end tip 7 of jackhammer 5 is arranged coaxially with longitudinal axis 51, opposite handles 56, 56′.
Mechanism 50 is further provided with two actuators 68, 68′, which are operatively connected to and controlled by handles 56. Actuators 68, 68′ are preferably hydraulic cylinders, and therefore possess a chamber end and a piston rod end. The chamber end of each actuator 68, 68′ is firmly connected to a finger 55, 55′ respectively of grip plate 52, and the piston rod end is connected to a corresponding pivot node 70, 70′. Upon activation of actuators 68, 68′, guides 64, 64′ of jackhammer attachment member 62 are slid along rods 60, 60′. Jackhammer 5 being affixed to jackhammer attachment member 62, as actuators 68, 68′ are activated, jackhammer 5 is translated away or towards rod attachment plate 58 between two limit positions: a first limit position where rods 60, 60′ are brought to their outward most extended limit position guides 64, 64′, and a second limit position where rods 60, 60′ are brought to their inward most retracted condition on the closed end portion of guides 64, 64′.
Since pivot nodes 70, 70′ of attachment member 62 link mechanism 50 to the rest of positioner 10, the displacement of attachment member 62 affects the conformation of positioner 10. Indeed, as actuators 68, 68′ are activated for translational motion of attachment member 62, base 20 and arm portions 32, 34 can be concurrently pivoted to follow the displacement of attachment member 62.
To use jackhammer positioner 10, platform 1 must be positioned at the vicinity of a structure which needs to be worked. Thereafter, the positioner 10 must be manually operated by workman W to position jackhammer 5, in order to juxtapose the operative tip 7 of jackhammer 5 in close proximity to the structure which needs to be worked.
Base 20, as well as arm 30 installed on base 20, can be manually pivoted for a full turn (360°) about vertical axle 22, to sweep a circular horizontal area overhanging horizontal platform 1.
Moreover, handles 56, 56′ can be manipulated by worker W to effortlessly control hydraulic actuators 24, 26; upon activation of actuators 24, 26, arm portions 32, 34 can be pivotally articulated about their shoulder joint 24A and elbow joint 32B, to retract or extend arm 30 within a vertical plane.
Furthermore, workman W can pivot yoke 40 about pivot axis 37, to rotate for up to a full turn the jackhammer 5 about the lengthwise axis of the latter. Workman W can also grip plate 52 by grip opening 53 and manually pivot mechanism 50 about pivot axis 71.
Also, by appropriately maneuvering handles 56, 56′ and activating actuators 68, jackhammer 5 can be moved in translation axially along longitudinal axis 51 between its first extended position and second retracted limit positions, as guides 64, 64′ of attachment member 62 are slidably driven back and forth along rods 60, 60′.
Finally, support structure 12 can be slid along rail 6 of platform 1, and the whole positioner 10 can thereby be linearly displaced over platform 1.
Jackhammer 5 is then conventionally activated, and the work can take place. An electric line 80 interconnects handles 56, 56′ to jackhammer 5, and a pneumatic line 82 interconnects jackhammer 5 to a pressurized air source. When the workman manipulates handles 56, 56′ to selectively activate jackhammer 5, handles 56, 56′ will send an electric activation signal to jackhammer 5. As a result thereof, pressurized air is injected into jackhammer 5 through the instrumentality of pneumatic line 82 to enable repeated back and forth hammering action of jackhammer tip 7 against the surface to be treated.
By providing a positioner with such relative displacement features, positioning the jackhammer in a desired position is effortless and easily accomplished. The positioner is versatile and can be operated to take numerous different conformations. Indeed, as illustrated in
Jackhammer positioner 10, as described herein, possesses additional advantageous features. In the prior art, when a workman W handles a jackhammer directly, the operative tip 7 thereof forcefully and repeatedly pounds onto a concrete structure in reciprocating fashion, and the hands of the workman W are consequently jarred. On the contrary, in positioner 10 of the present invention, jackhammer 5 is not directly in contact with the workman; jackhammer 5 is attached to support member 62, which can recoil and slide along rods 60 every time operative tip 7 pounds on concrete. 20 The reciprocating motion of the jackhammer 5 is thus not transmitted to the workman using jackhammer 5 when it is installed on positioner 10, and the workman's hands are hence less, or even not at all jarred.
Alternative embodiments of the invention will now be described. As illustrated in
Channel 118 has a diameter which is equal or slightly inferior to that of base 120.
If base 120 is subjected to an off-centred force A, base 120 will tend to tilt laterally. Since channel 118 is slightly smaller in diameter than base 120, the top peripheral edge of channel 118 will peripherally support base 120. Such a tilting motion, which would be likely to provoke bending and permanent damage of axle 122, is hence accounted for by inherent tilt compensation.
In another alternate embodiment (not illustrated in the appended drawings), support structure 12 is not slidable about a rail. Rather, support structure 12 is fixedly anchored on platform 1, and therefore can not be linearly displaced.
Certain modifications and improvements will occur to those skilled in the art upon a reading of the foregoing description. It should be understood that all such modifications and improvements have been omitted herein for the sake of conciseness and readability but are properly within the scope of the following claims.
