CA1105445A - Hydraulic floor jack - Google Patents
Hydraulic floor jackInfo
- Publication number
- CA1105445A CA1105445A CA337,828A CA337828A CA1105445A CA 1105445 A CA1105445 A CA 1105445A CA 337828 A CA337828 A CA 337828A CA 1105445 A CA1105445 A CA 1105445A
- Authority
- CA
- Canada
- Prior art keywords
- frame section
- hydraulic
- jack
- rear frame
- hydraulic cylinder
- 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
Links
Landscapes
- Vehicle Body Suspensions (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A hydraulic floor jack of the type which rolls on the floor to engage under a vehicle to lift it. This jack is characterized by an articulated frame to operatively and selectively use less floor space, flexible tire wheels to allow the load on the jack to be transmitted directly to the floor by the base of the jack upon flexing of the flexible tires under the load until the best rests on the floor, and by a narrow construction and arrangement of the operative parts to allow engagement in narrow spaces and in particular between the tandem wheels of a truck.
A hydraulic floor jack of the type which rolls on the floor to engage under a vehicle to lift it. This jack is characterized by an articulated frame to operatively and selectively use less floor space, flexible tire wheels to allow the load on the jack to be transmitted directly to the floor by the base of the jack upon flexing of the flexible tires under the load until the best rests on the floor, and by a narrow construction and arrangement of the operative parts to allow engagement in narrow spaces and in particular between the tandem wheels of a truck.
Description
This invention relates to a hydraulic floor jacl< oF the type which rolls on the floor to engage under a vehicle and lif-t it.
The existing jacks of th~ above type have ao far been rnade with a rigid frame and solid wheels resulting in a construction of fixed and substantial length which is cumbersome to use in many places where there is limited floor space to maneuver. Besides, wi-th the solid ,lheels~ the full load must be carried by the wheels and the axles thereof. This requires a solid and heavy construction which does not allow or is not conducive to a narrow shape or form to engage in narrow spaces such as between a set of fore and aft wheels o~ a tandem wheel and axle asssmbly of a truck.
It is a general object of the present invention to provide an hydraulic floor jack of the above type which avoids the above mentioned disadvantages.
It is a more specific object of the present invention to provide an hydraulic floor jack of the above type which is articulated to allow maneuvering in limited floor space and to operatively occupy very little floor space of its own beside the floor space occupie~ by the vehicle under which it is used.
~0 It is another obj~ct of the present inventi,on to provide an hydraulic floor jack of the above type which is constructed and arranged to produce a narrow forrn engageable in narrow spaces such as be-tween the aforementioned wheels of a vehicle.
It is a further object of the present invsntion to provide an hydraulic floor jack o~ the above type which is of lighter and relative-ly less expensive construction.
It is a more specific further object of the present invention to provide an hydraulic floor jack of the above type which is constructed to transmit the load thereon directly from the base of the hydraulic cylinder to the floor indepandently of the whsels and to thersby achieve a lighter cons-truction.
It is still anoth~r object of the prssent invsntion to provids an hydraulic ~loor jac~ which includes articulatsd ssctions to minimi~e the encumbrancs thsrsof anL which allows actuation of -ths jack in any predsterminsd articulatsd position.
Ths above and other obj~cts and advantagss of the pressn-t `
invention will be better understood oith refersnce to the following dstailsd description of a prsfsrred smbodiment thsrsof which is - illustrated, by way of exampls, in ths accompanying drawings, in which:
1~ Figure 1 is a psrspective visw of an hydraulic floor jack according to the prssent invsntion;
Figurs 2 is a top visw of the jack of Figurs 1;
Figure 3 is a sids visw ~f the sarne jack showing in dottsd linss a rsar frams section in fully slsvatsd position, angularly rslativs to the front frame section; and Figure 4 is a diagrammatic visw of the hydraulic circuit and a detailsd view of the associatsd slsmsnts.
Ths illustrated hydraulic floor jack comprisss a frams formed of a front frame ssction 1 and a rsar frame ssction 2, each of narrow rectangular frame structure, as can be sesn in Figures 1 and 2. Ths frame structure of the front section 1 includes transvsrse ends 3 and 4 joined to longitudinal sidss 5 and 6. Similarly, the frams structure of the rear section 2 includes transverss ends 7 and 8 and longitudinal sides 9 and lû.
A wheel axle ll extends through ths tubular side 3 of ths front section l and rotativsly carries a pair of whsels 12 on its outwardly projecting snds. As shown, each whssl 12 is providsd with an inflatabls tirs 13 or othsrwise flexible tires. A pair of fest 14 are fixsdly secured as by wslding to the same end o~ ths front ~rams section 1 as the transverss snd 4 to carry ths frame structurs of this section off ths floor coopsratively with the whsels 120 A solid bass 15 is fixadly sscursd by lugs 16 to downwardly project a predetarrnine.' and limi-ted height from the floor ,uch as to allow this base -to rest on the ground upon flexing of the tires le upon loading on the jack. The base 15 registers with tha rectangular opening defined by the frame structLIra 3, 4, 5 and 6 and at the end thereof adjarent the flexibl~ tir~ whesls 12. An hydraulic cylinder 17 is secured upright on the basa 15 and has an intarna! piston 18 having an outer projecting head 19 of smaller diamster than the remainder of the piston to form an upward male projoction. A pair of studs 20 upwardly project from tha longitudinal sides ~ and G
lû respectively. A pair of axtensions 21 and 22 are engagsd over each stud 20 by engagamQnt of tha lattar in a corresponding famala bottom portion of the extensions. The la-tter are adaptad to fit over the upper male head 19 of the jack piston to provide an eXtQnsiOn to the latter .
The rear frame section 2 is provided witil a pair of lugs 23 which ars pivoted by a transverse pivot pin 24 to the frame structurP of ths front section 1. The pin 24 extends inside the tubular transverse end 4.
A locking rod 25 is slidabls endwise in the transvers~ ands 7 and 8 and is biased by a spring 26 forwardly toward the front frame ~0 section. Tha for'ward end of the locking rod 25 operatively projects forward from the transvers~ end 7 to operatively engage into one of a plurality of holes 27 angularly positioned around the transversa end 4. For instance, in this case, thera ara 3 into the transverse end 4 angularly arranged at predetermined anglQs to lock the rear ~rame section 2 at say 0, 45 or 100 degreeq of angular elevation relative to the front frame section. For instance, the 0 degree position is shown in full lines and the 100 dsgree position is shown in dotted lines in Figure 3. The outer and o~ the locking rod 25 is provide,d with a pull knob 28 to selectively unlock the rod by pulling thereon against ~o tha bias of the spring 26 until the front end th~reof disQngages the hole 27 in which it was.
A pair of lags 29 ara fixedly secllred to the outer and of the 5~
rear frame section 2 to support the sarre gsnerally level with -tha front frame section 1. A handle socket 30 outwardly projects and opens from the transverse end 8 in registry with a bore diametrically through this transverse end 8.
A valve unit 31, shown in details in Figure 4, is fixedly secured to the rear frame structure between the longitudinal sides ~ an~
10 thereof. The valve unit 31 is prc)vidsd with a twice r,ount~rbored aperture therein defining a smaller diameter cylindrical chamber 32, a larger diameter cylindrical chamber 33, and a still larger outer lb chambsr 34. These chambers serially communicate with each other and wit.h an inlet passage 35 at the end of the smaller chamber 32. A ball 36 is axially biased by a spring 37 to close the inlet passage 35. A ball 38 is axially biased by a spring 39 to close the passage between the chambers 32 and 33. The outer end of the spring 39 is seated in a movable cup 40 whieh is held in placa by a threaded ,lug or cap ~1. This arran-gement produces a cascaded check valve adapted to be operated by a pump 42. The latter includqs a piston 43 axially displaceable in a bore 44 radially communieating with the small.er cylindrical chamber 32. A
cylindrical cap 45 forms an axial extension of the hydraulic cylinder 2û bore. A piston rod 46 is secured to the pistwn 4" and outwardly projects frorn the cap 45~ A post 47 is fixed to the valve unit 31.
A pump act~lator arm 48 is pivoted at one end on the post 47 through a pivot 49 and i5 provided at the other end with a hanclle socket 50 to receiva one end of a handle 51.
The inlet passage 35 is connectad by a pipe or tube 52 to an hydraulic fluid reservoir 53 also rno~nted on the rear frame section
The existing jacks of th~ above type have ao far been rnade with a rigid frame and solid wheels resulting in a construction of fixed and substantial length which is cumbersome to use in many places where there is limited floor space to maneuver. Besides, wi-th the solid ,lheels~ the full load must be carried by the wheels and the axles thereof. This requires a solid and heavy construction which does not allow or is not conducive to a narrow shape or form to engage in narrow spaces such as between a set of fore and aft wheels o~ a tandem wheel and axle asssmbly of a truck.
It is a general object of the present invention to provide an hydraulic floor jack of the above type which avoids the above mentioned disadvantages.
It is a more specific object of the present invention to provide an hydraulic floor jack of the above type which is articulated to allow maneuvering in limited floor space and to operatively occupy very little floor space of its own beside the floor space occupie~ by the vehicle under which it is used.
~0 It is another obj~ct of the present inventi,on to provide an hydraulic floor jack of the above type which is constructed and arranged to produce a narrow forrn engageable in narrow spaces such as be-tween the aforementioned wheels of a vehicle.
It is a further object of the present invsntion to provide an hydraulic floor jack o~ the above type which is of lighter and relative-ly less expensive construction.
It is a more specific further object of the present invention to provide an hydraulic floor jack of the above type which is constructed to transmit the load thereon directly from the base of the hydraulic cylinder to the floor indepandently of the whsels and to thersby achieve a lighter cons-truction.
It is still anoth~r object of the prssent invsntion to provids an hydraulic ~loor jac~ which includes articulatsd ssctions to minimi~e the encumbrancs thsrsof anL which allows actuation of -ths jack in any predsterminsd articulatsd position.
Ths above and other obj~cts and advantagss of the pressn-t `
invention will be better understood oith refersnce to the following dstailsd description of a prsfsrred smbodiment thsrsof which is - illustrated, by way of exampls, in ths accompanying drawings, in which:
1~ Figure 1 is a psrspective visw of an hydraulic floor jack according to the prssent invsntion;
Figurs 2 is a top visw of the jack of Figurs 1;
Figure 3 is a sids visw ~f the sarne jack showing in dottsd linss a rsar frams section in fully slsvatsd position, angularly rslativs to the front frame section; and Figure 4 is a diagrammatic visw of the hydraulic circuit and a detailsd view of the associatsd slsmsnts.
Ths illustrated hydraulic floor jack comprisss a frams formed of a front frame ssction 1 and a rsar frame ssction 2, each of narrow rectangular frame structure, as can be sesn in Figures 1 and 2. Ths frame structure of the front section 1 includes transvsrse ends 3 and 4 joined to longitudinal sidss 5 and 6. Similarly, the frams structure of the rear section 2 includes transverss ends 7 and 8 and longitudinal sides 9 and lû.
A wheel axle ll extends through ths tubular side 3 of ths front section l and rotativsly carries a pair of whsels 12 on its outwardly projecting snds. As shown, each whssl 12 is providsd with an inflatabls tirs 13 or othsrwise flexible tires. A pair of fest 14 are fixsdly secured as by wslding to the same end o~ ths front ~rams section 1 as the transverss snd 4 to carry ths frame structurs of this section off ths floor coopsratively with the whsels 120 A solid bass 15 is fixadly sscursd by lugs 16 to downwardly project a predetarrnine.' and limi-ted height from the floor ,uch as to allow this base -to rest on the ground upon flexing of the tires le upon loading on the jack. The base 15 registers with tha rectangular opening defined by the frame structLIra 3, 4, 5 and 6 and at the end thereof adjarent the flexibl~ tir~ whesls 12. An hydraulic cylinder 17 is secured upright on the basa 15 and has an intarna! piston 18 having an outer projecting head 19 of smaller diamster than the remainder of the piston to form an upward male projoction. A pair of studs 20 upwardly project from tha longitudinal sides ~ and G
lû respectively. A pair of axtensions 21 and 22 are engagsd over each stud 20 by engagamQnt of tha lattar in a corresponding famala bottom portion of the extensions. The la-tter are adaptad to fit over the upper male head 19 of the jack piston to provide an eXtQnsiOn to the latter .
The rear frame section 2 is provided witil a pair of lugs 23 which ars pivoted by a transverse pivot pin 24 to the frame structurP of ths front section 1. The pin 24 extends inside the tubular transverse end 4.
A locking rod 25 is slidabls endwise in the transvers~ ands 7 and 8 and is biased by a spring 26 forwardly toward the front frame ~0 section. Tha for'ward end of the locking rod 25 operatively projects forward from the transvers~ end 7 to operatively engage into one of a plurality of holes 27 angularly positioned around the transversa end 4. For instance, in this case, thera ara 3 into the transverse end 4 angularly arranged at predetermined anglQs to lock the rear ~rame section 2 at say 0, 45 or 100 degreeq of angular elevation relative to the front frame section. For instance, the 0 degree position is shown in full lines and the 100 dsgree position is shown in dotted lines in Figure 3. The outer and o~ the locking rod 25 is provide,d with a pull knob 28 to selectively unlock the rod by pulling thereon against ~o tha bias of the spring 26 until the front end th~reof disQngages the hole 27 in which it was.
A pair of lags 29 ara fixedly secllred to the outer and of the 5~
rear frame section 2 to support the sarre gsnerally level with -tha front frame section 1. A handle socket 30 outwardly projects and opens from the transverse end 8 in registry with a bore diametrically through this transverse end 8.
A valve unit 31, shown in details in Figure 4, is fixedly secured to the rear frame structure between the longitudinal sides ~ an~
10 thereof. The valve unit 31 is prc)vidsd with a twice r,ount~rbored aperture therein defining a smaller diameter cylindrical chamber 32, a larger diameter cylindrical chamber 33, and a still larger outer lb chambsr 34. These chambers serially communicate with each other and wit.h an inlet passage 35 at the end of the smaller chamber 32. A ball 36 is axially biased by a spring 37 to close the inlet passage 35. A ball 38 is axially biased by a spring 39 to close the passage between the chambers 32 and 33. The outer end of the spring 39 is seated in a movable cup 40 whieh is held in placa by a threaded ,lug or cap ~1. This arran-gement produces a cascaded check valve adapted to be operated by a pump 42. The latter includqs a piston 43 axially displaceable in a bore 44 radially communieating with the small.er cylindrical chamber 32. A
cylindrical cap 45 forms an axial extension of the hydraulic cylinder 2û bore. A piston rod 46 is secured to the pistwn 4" and outwardly projects frorn the cap 45~ A post 47 is fixed to the valve unit 31.
A pump act~lator arm 48 is pivoted at one end on the post 47 through a pivot 49 and i5 provided at the other end with a hanclle socket 50 to receiva one end of a handle 51.
The inlet passage 35 is connectad by a pipe or tube 52 to an hydraulic fluid reservoir 53 also rno~nted on the rear frame section
2. An outl~t passage 54 at one end communicates with the larger cylindrical ehambsr 33 and at the other end ra-lially communicates with a high pressure fluid passage 55 eonnected by a tube or hose 56 to the hydraulic cylinder 17 through a passage 57 in the base 15.~ A pressure `` release passage 58 communicates at one end with the high pressure fluici passage 55 in offset position relative to the flow patll between the outlet .. . . .. , . _ . . .. . . . .. . .. . . . . ... .. . .
'~, ~J~
passage.54 and the.hydraulic cylinder 17. A pipe 59 connects the pressure release passage 58 to th~- ressrvoir 53.
~ prl-ssure release valve 60 is operati.vel.y connec-ted to the passage 55 and includes a needl~ 61 adapted to axially movn in thi~
passage and close thc pressure release passage 58. The nesdl~ 61 is provided on the inner end of a member having an int~rmt,'iate threaded portion 62 and`an outer socket end~portion 63. This valve is opened or closed by appropriate rotation ~f th_ ~ockst portion 63 by ths handlc 51 which must be engagad in the handle socket 30 for that purpose. Upon rotation9 the threaded pnrtion cause axial displacement of tho needle 61 to either open or close the pressure release passage 58. When this valve is opened, the hydraulic fluid pressure if any in the cylinder is released into the reservoir 53 through the concluits 57, 56, 55, 58 and 59.
When the valve is clnsod? the pumping by engagement of the handle 51 in the handle socket 50 produces hydraulic fluid to be sucked in the chamb~r 32 and therea~ter expelled into ths larger chamber 33 and the outlet passage 54 toward the hydraolic cylinder 17 for each suction ancl expulsion stroke of the piston 43. Thus, the pressure may be built up to lift a vehicle enyaged by the piston head 19 .
Il; must be noted that the locking rod 25 allows to secure the rear frame section 2 in any predetermined position such as to be able to operate the pump 42 and the pressure re].ease valve 60 in any elevated position of the rear section.
'~, ~J~
passage.54 and the.hydraulic cylinder 17. A pipe 59 connects the pressure release passage 58 to th~- ressrvoir 53.
~ prl-ssure release valve 60 is operati.vel.y connec-ted to the passage 55 and includes a needl~ 61 adapted to axially movn in thi~
passage and close thc pressure release passage 58. The nesdl~ 61 is provided on the inner end of a member having an int~rmt,'iate threaded portion 62 and`an outer socket end~portion 63. This valve is opened or closed by appropriate rotation ~f th_ ~ockst portion 63 by ths handlc 51 which must be engagad in the handle socket 30 for that purpose. Upon rotation9 the threaded pnrtion cause axial displacement of tho needle 61 to either open or close the pressure release passage 58. When this valve is opened, the hydraulic fluid pressure if any in the cylinder is released into the reservoir 53 through the concluits 57, 56, 55, 58 and 59.
When the valve is clnsod? the pumping by engagement of the handle 51 in the handle socket 50 produces hydraulic fluid to be sucked in the chamb~r 32 and therea~ter expelled into ths larger chamber 33 and the outlet passage 54 toward the hydraolic cylinder 17 for each suction ancl expulsion stroke of the piston 43. Thus, the pressure may be built up to lift a vehicle enyaged by the piston head 19 .
Il; must be noted that the locking rod 25 allows to secure the rear frame section 2 in any predetermined position such as to be able to operate the pump 42 and the pressure re].ease valve 60 in any elevated position of the rear section.
Claims (6)
OR PRIVILEGE IS CLAIMED, ARE DEFINED AS FOLLOWS:
1. A hydraulic floor jack comprising an articulated frame in-cluding a front and a rear frame sections hinged one to the other, flexible tire wheel means attached to the front frame section and rollably supporting the same, a locking device connected to said frame and operatively locking the rear frame section in selected angular elevation relative to the front frame section, a rigid base fixed to said front frame section adjacent said flexible tire wheel means, and depending therefrom at a predetermined limited height for engagement with the ground upon flexing of any tire of the flexible tire wheel means, an hydraulic cylinder secured upright on said base, an hydraulic fluid supply mounted on the frame, and a pump secured to the rear frame section, connected to the hydraulic fluid supply and to the hydraulic cylinder and selectively supplying hydraulic fluid under pressure to the hydraulic cylinder upon selective actuation thereof.
2. A hydraulic floor jack as defined in claim 1, wherein said front and said rear frame sections are elongated and hinged end to end one to the other pivotally about a transverse pivot axis, and a handle operatively engages said pump longitudinally of the elongated frame sections and is operable in either angular position of the rear frame section relative to the front frame section.
3. A hydraulic floor jack as defined in claim 2, wherein said locking device includes a spring biased rod operatively engageable into one of a plurality of angularly spaced apart holes in the front frame section and secured to the rear frame section for endwise displacement longitudinally of the latter and unlocking upon said displacement.
4. A hydraulic floor jack as defined in claim 1, 2 or 3, wherein each of the front and rear frame sections includes a rectangular frame structure defining an enclosed central space, said base is fixedly secured to the rectangular frame of the front frame section at the front of the enclosed central space thereof, and said pump includes a valve unit fixedly secured to the rectangular frame structure of the rear frame section.
5. A hydraulic floor jack as defined in claim 1, 2 or 3, further including said hydraulic cylinder having an upwardly projecting outer piston head, studs upwardly projecting from the front frame section, and auxiliary jack extensions having a female end resting over said studs and operatively engaging over said upwardly projecting outer piston head and providing selective extension of the operative height of the hydraulic cylinder.
6. A hydraulic floor jack as defined in claim 2, or 3, wherein a handle socket is fixedly secured to said rear frame section and accommodates said handle for maneuvering of the jack, said pump includes a valve unit having a pressure release valve communicating with the hydraulic cylinder and connected to said handle socket whereby said pressure release valve is actuated by said handle upon engagement of the latter in the handle socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA337,828A CA1105445A (en) | 1979-10-17 | 1979-10-17 | Hydraulic floor jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA337,828A CA1105445A (en) | 1979-10-17 | 1979-10-17 | Hydraulic floor jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105445A true CA1105445A (en) | 1981-07-21 |
Family
ID=4115368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA337,828A Expired CA1105445A (en) | 1979-10-17 | 1979-10-17 | Hydraulic floor jack |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1105445A (en) |
-
1979
- 1979-10-17 CA CA337,828A patent/CA1105445A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |