IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0020056
(2004-12-23)
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발명자
/ 주소 |
- Woolley, Brent Alan
- Starr, II, Stephen Garrett
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인용정보 |
피인용 횟수 :
11 인용 특허 :
8 |
초록
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A hydraulic puller apparatus for extracting objects from the ground, including objects anchored in a concrete slug, includes a pair of hydraulic jacks, each having a ram with an elongate lift arm pivotally connected at an upper end thereto; and a puller head having a pair of jaw support platforms di
A hydraulic puller apparatus for extracting objects from the ground, including objects anchored in a concrete slug, includes a pair of hydraulic jacks, each having a ram with an elongate lift arm pivotally connected at an upper end thereto; and a puller head having a pair of jaw support platforms disposed on opposite sides of a generally U-shaped opening. A pair of jaws each mounted on a respective jaw support platform are moved by respective drive screws to grip opposite sides of the object. The puller head is positioned with its opening straddling a lower end of the object, the jaws are engaged on opposite sides of the object, the jacks are placed on opposite sides of the object, and the lift arms are engaged in opposed ends of the puller head. Then the jacking mechanisms of the jacks are actuated, preferably simultaneously, to extend the rams and extract the object.
대표청구항
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1. A hydraulic puller apparatus for extracting objects from the ground, including objects that may be anchored in a concrete slug, comprising:a pair of hydraulic jack members, each having a ground engaging base and an extensible and retractable ram member actuated by a pump rod and cylinder jacking
1. A hydraulic puller apparatus for extracting objects from the ground, including objects that may be anchored in a concrete slug, comprising:a pair of hydraulic jack members, each having a ground engaging base and an extensible and retractable ram member actuated by a pump rod and cylinder jacking mechanism at said base including actuating means for actuating said pump rod;a pair of elongate lift arm members each having an upper end pivotally connected to the top of a respective said ram member and an outwardly extending horizontal tongue member at a lower end thereof;a puller head assembly removably supported at opposed ends on said horizontal tongue member of a respective said lift arm, said puller head having a pair of generally rectangular jaw support platforms disposed in parallel laterally spaced relation defining a central generally U-shaped opening therebetween which is open on one side and sized to straddle the width of the object to be extracted;a pair of jaw members each slidably mounted on a respective said jaw support platform in opposed facing relation for movement between a retracted position away from said U-shaped opening and an extended gripping position engaged on the object to be extracted, and each having a generally rectangular head portion with an outer facing gripping surface configured to grip opposite sides of the object to be extracted;a pair of drive screw members, each threadedly engaged on a respective said jaw support platform in opposed facing relation and having an inner facing end engaged with a respective said jaw member for moving said jaw member between said retracted and extended positions upon rotation thereof, and each having an outer facing end configured to receive rotating means for rotating same; whereinsaid puller head is positioned with said U-shaped opening straddling a lower end of the object to be extracted, said drive screw members are rotated to move said jaws to their extended gripping position firmly engaged on the object to be extracted, said jack members are placed on opposite sides of the object to be extracted, said lift arm tongue members are engaged in opposed ends of said jaw support platforms, and said pump rod and cylinder jacking mechanisms of said jack members are actuated to extend said ram members to a height sufficient to extract the object from the ground.2. The hydraulic puller apparatus according to claim 1, whereineach of said jaw support platforms has an outer end with a generally rectangular opening therethrough for removably receiving said horizontal tongue member of a respective said lift arm to support said puller head assembly thereon.3. The hydraulic puller apparatus according to claim 1, whereineach of said elongate lift arms is of a sufficient length to support said puller head assembly on said horizontal tongue member at or just above ground level when said ram member is in a retracted position.4. The hydraulic puller apparatus according to claim 1, further comprising:support means at each of said puller head assembly opposed ends for supporting said puller head in a generally horizontal position above the ground surface.5. The hydraulic puller apparatus according to claim 4, whereinsaid support means comprises a pair of support stands, each pivotally connected at a first end adjacent to an outer end of a respective said jaw support platform and having second ground engaging end, said support stand capable of being between a generally horizontal stored position and a generally vertical ground engaging support position.6. The hydraulic puller apparatus according to claim 1, further comprising:said outer facing gripping surface of each said jaw member generally rectangular head portion comprises a series of parallel vertically spaced horizontal V-shaped peaks and valleys forming a toothed surface, and a central concave portion having a radius of curvature sufficient to accommodate round objects to be extracted, whereby said outer face provides a positive slip-resistant grip for extracting square or round objects to be extracted.7. The hydraulic puller apparatus according to claim 1, further comprising:jaw guide means on each said jaw support platform engaged with a respective said jaw member to slidably retain said jaw member on said jaw support platform during movement between its said retracted position and extended gripping position and while engaged on the object to be extracted during the extraction operation.8. The hydraulic puller apparatus according to claim 1, whereineach said jaw member has a pair of elongate parallel spaced slide bars extending rearwardly from said rectangular head portion which are slidably retained on a respective said jaw support platform.9. The hydraulic puller apparatus according to claim 8, further comprising:jaw guide means on each said jaw support platform engaged with said pair of elongate parallel spaced slide bars of a respective said jaw member to slidably retain said jaw member on said jaw support platform during movement between its said retracted position and extended gripping position and while engaged on the object to be extracted during the extraction operation.10. The hydraulic puller apparatus according to claim 9, whereinsaid jaw guide means comprises a pair of upstanding longitudinal guide rails on the top surface of each said jaw support platform inwardly adjacent to opposed longitudinal sides thereof, and a retainer plate secured thereover such that said slide bars of said jaw member are slidably captured between said retainer plate and said top surface of said jaw support platform.11. The hydraulic puller apparatus according to claim 9, whereinsaid jaw guide means comprises a pair of hollow generally rectangular longitudinal guides on the top surface of each said jaw support platform inwardly adjacent to opposed longitudinal sides thereof, and said slide bars of said jaw member are slidably retained therein.12. The hydraulic puller apparatus according to claim 1, further comprising:an upstanding drive block on the top surface of each said jaw support platform disposed a distance outwardly from said U-shaped opening and having a threaded aperture extending therethrough;each of said drive screw members having a threaded shank portion threadedly engaged in a respective said drive block for moving a respective said jaw member between said retracted and extended positions.13. The hydraulic puller apparatus according to claim 1, further comprising:a wheel removably and rotatably mounted on each of said hydraulic jack members adjacent to said base.14. The hydraulic puller apparatus according to claim 1, further comprising:actuating means adapted to be releasably engaged with said pump rod and cylinder jacking mechanism of both said hydraulic jack members for actuating both simultaneously;whereby both said ram members are extended simultaneously to extract the object from the ground.15. The hydraulic puller apparatus according to claim 14, whereineach said pump rod and cylinder jacking mechanism includes a socket member pivotally mounted at one end on said hydraulic jack member and engaged with said pump rod for moving said pump rod in a reciprocating pumping action; andsaid actuating means comprises a pump handle releasably engaged with said socket of said rod and cylinder jacking mechanisms of both of said hydraulic jack members for actuating both simultaneously;whereby both said ram members are extended simultaneously to extract the object from the ground.16. The hydraulic puller apparatus according to claim 15, whereinsaid pump handle having opposed laterally adjustable spaced ends each adapted to be received in respective said pump rod and cylinder jacking mechanism socket.17. The hydraulic puller apparatus according to claim 14, further comprising:a cam member rotatably mounted on each said hydraulic jack member and having an outer periphery configured to intermittently engage said pump rod of said pump rod and cylinder jacking mechanism and move said pump rod in a reciprocating pumping action upon rotation of said cam member; andsaid actuating means is connected with said cam member of both of said hydraulic jack members for rotating both cam members simultaneously;whereby both said ram members are extended simultaneously to extract the object from the ground.18. The hydraulic puller apparatus according to claim 17, whereinsaid actuating means comprises rotary drive means for rotating both cam members simultaneously.19. The hydraulic puller apparatus according to claim 18, whereinsaid rotary drive means comprises:a gear assembly including a drive gear operatively engaged with a pair of driven gears;a pair of flexible cables each having a first end connected with a respective said driven gear and a second end connected with a respective said cam member, said drive gear adapted to releasably receive rotating means for rotating said drive gear and driven gears and transmitting torque through said flexible cables to said cam members to impart rotary motion thereto.20. A method for extracting objects from the ground, including objects that may be anchored in a concrete slug, comprising the steps of:providing a pair of hydraulic jack members, each having a ground engaging base and an extensible and retractable ram member actuated by a pump rod and cylinder jacking mechanism at said base including actuating means for actuating said pump rod, and an elongate lift arm pivotally connected at an upper end to the top of said ram member and having an outwardly extending horizontal tongue member at a lower end thereof;providing a puller head having a pair of jaw support platforms disposed in parallel laterally spaced relation defining a central generally U-shaped opening therebetween which is open on one side and sized to straddle the width of the object to be extracted, a pair of jaw members each slidably mounted on a respective jaw support platform in opposed facing relation and having a head portion with a gripping surface, and a drive screw threadedly engaged on a respective jaw support platform having an inner facing end engaged with a respective jaw member for moving said jaw member between a retracted and extended position upon rotation thereof, each drive screw having an outer facing end for receiving rotating means for rotating same;positioning said puller head with its said U-shaped opening straddling a lower end of the object to be extracted, and rotating the drive screws to move the jaws to their extended gripping position firmly engaged on opposite sides of the object to be extracted;placing said jack members on opposite sides of the object to be extracted, and engaging the lift arm tongue members in opposed ends of the jaw support platforms; andactuating said pump rod and cylinder jacking mechanisms of said jack members to extend said ram members to a height sufficient to extract the object from the ground.
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