US1977524A - Motor vehicle jack - Google Patents

Description

Oct'. 16, 1934. w. NATURKACZ 1,977,524

MOTOR VEI'IIClllE JACK Filed Aug. 5, 1933 vgnvenloftf Patented Oct. 16, 1.934

UNITED l ,srnllssYPA'iiazNT! opl-ICE y 1,977,524` Mo'ron VEHICLE JACK Walter Naturkacz, Buffalo, N. Y. Application August 5, 193.3, serial No. 683,829

` 2 claims.v (ci.l asi-9s).

This invention relates to certain new and useful improvements in motor vehicle jacks adapted to be operated from the engine of a motor vehicle.

The primary object of thisinvention is to pro- 5 v ide a-jack of the fluid pressure. type including a `dash pot structure which may be attached by means of a pipe or the like to a reservoir supplied by a converted engine cylinder or other source of supply.

A further object of this invention is to provide manually operated means for operating the jack when it is not desired to use the air pressure and said means also functions as a locking device for holding the jack in a raised position after air pressure has been employed for operating the same.

Other objects and. advantages of the invention will become apparent during the course of the following description, forming a part ofthis specication, taken with the drawing, wherein,

Figure 1 is a front elevational view of the vehicle jack illustrating the manual operating device rotatably mounted on the screw threaded piston shaft;

Figure 2 is a vertical cross-sectional view taken on line 2 2 of Figure 1, looking in the direction of the arrows illustrating the construction and details of the jack with respect to the' manual operating device and lock;

Figure 3 is a horizontal cross-sectional view taken on line 3-3 cf Figure l, looking in the direction of the arrows illustrating the manual operating device and lock enlarged and showing the screw threaded piston shaft extending therethrough;

Figure 4 is a horizontal cross-sectional view taken on line 4--4 of Figure 1, looking in the direction of the arrows and further'illustrating the combined manual operating device and lock enlarged to set forth the details of construction;

Figure 5 is an exploded view of the piston shaft employed in the jack illustrating the packing members sandwiched between the metallic disks; vFigure 6 is a top elevational view of one of the disks employed in the packing element.

Referring more in. detail to the accompanying drawing, there/ is shown a pressure operated jack adapted to beloperated by air pressure from any suitable source, the jack comprising a cylinder'50 at the lower end of which is formed an annular boss 51 adapted to be received in an annular opening 52 formed in a base member 53. A-

screw 54 is adapted to 'hold the base member 53 in place. 55 The upper end of the cylinder 50 is screw threaded as at 55 for receiving a screw threaded cap' 56 provided with an upstanding collar 57. Reciprocably mounted within the cylinder 50 is a piston 58 to which is formed a vertical rod 59 having spiral grooves 69 forming screw threads 60 61. Attached to the piston head 58 is a packing element 62 and comprises a flexible washer 63 sandwiched between the metallic disks 64 as shown in'Figure 5. .Each of the metallic disks 64 is provided with radial slots 65 to aid resiliency 65 and -in addition the disks 64 are provided with punched out portions 66, forming projections or prongs for engaging the flexible washers 68 to tightly hold the same in place. The packing assembly 62 is secured in the piston 58 by means 'I0 of a screw 67 which is received in a correspondingly screw threaded opening 69 formed in the piston head as shown in Figure 2. An adjusting nut 67' is threaded on the screw for adjusting the tension of the packing element relative to the piston head 58. Secured to the upper end of the piston shaft 59 is an axle engaging element 70 secured to a rounded portion of the shaft 59 as at 71, and held in place bykeys 73. A lateral exl tension 74 is formed on the axle engaging member and is provided with a special engaging surface 75 adapted to engage different portions of the motorvehicle underframe.

Completely encircling the screw threaded piston shaft 59 is' a housing 76 having a cover 77 85 held in place by suitable fastening elements 78 such as screws or the like. The housing lis provided with a boss 79 for receiving a handle 80 for the purpose of rotating the housing 76. Loosely mounted within the housing 76 is agring 81 more 90 clearly shown in Figure 4 having ratchet teeth 82 formed on the periphery thereof and internally `screw threaded as at 83 for receiving the screw threads 61 formedl on the piston shaft 59. Also formed on the housing 76is an extension 84 95' having an internal chamber 85 communicating with a bore 86. The outer end of the chamber 85 is closed by a screw threaded plug 87 and slidably mounted in the bore 86 is a 'wedge shaped dog 88 adapted to engage the teeth 82 formed 100 on the floating ring 81. The sliding dog 88 isv provided with a reduced -portion 89 which is encircled by a coil spring 90 having one end engaging the enlarged portion of the slidingdog 88 while the opposite endv engages the plug 87. Formed on the end of the sliding rod 89 is a thumb piece 91 which is adapted to rotate the sliding dog 88 4for the purpose of reversing the ratchet effect.

When it is desired to manually operate the 119..

jack, the handle. 80 maybe bscillated whereby the sliding dog 88 will engage the teeth of the 'oatingring 82 to cause -the same to be rotated so that the screw threaded shaft 60. will be raised or lowered according to the direction inwhich thesliding dog 88 is positioned The housing 76 is adapted to rest upon the upper edge of the outwardly extending collar 57 'as is shown clearly in Figures 1 and 2. When the jack is operated by air pressure', a source of air "supply is placed-- 'into communication with theconnection 100 whereby air may be forced into the cylinder 50' to raise the piston 5.8 which will raise the axle engaging member 72 to elevate the vehicle body and of the' chassis frame., After the piston '58 has moved to its limit, the housing 76 may be' out departing from the'spirit of the inventionoscillated by means of the handle Vto niov'e the housing downwardly upon the collar 57 to lock the 'piston 58 in its position Aand to hold the motor vehicle elevated while a tire or the like is being repaired or changed on the vehicle.

It' is to be understood that the form of the invention herewith shown 'and described is to be taken as a preferred embodiment of the same and that various changes 4in the shape, size and arrangement of parts maybe resorted to withor the scope of the sub-joined claims.

I claim:- i 1. A motor vehicle fluid operated jack comprisingia cylinder, a piston reciprocably mounted therein, a screw threaded rod secured to the piston, an axle engaging element carried on the free-end of the rod, an annular housing of chan nel formation in cross-section encircling the screw threaded rodand abuttingly engaged with the cylinder, a floating ring mounted in the hous' ing between the side walls thereof, internal screwthreads formed on the floating ring, engaged with the rod threads, external ratchet teethformed on the floating ring, a spring pressed pawl carried by the housing adapted to engage the ratchet teeth, a. iinger piece .on the outer end of the pawl for rotating the same whereby the ratchet device may be =reversed and a.' handle on the housing.

.. 2. A motor vehicle uid. operated jack comprising a cylinder, a piston reciprocable therein! the lower end of the cylinder adapted to be supplied ternally threaded ring loosely mounted in thehousing and confined by .the sidewalls thereof and having -threa'ded engagement with the threaded rod, ratchet teeth on the periphery of the ring, a. reversible pawl carried by the housing and`- engaged with the ratchet teeth and a handle carried by the housing for effecting rota- 1 tion of the housing and ring for manual elevation of the piston andscrew rod.

WALTER NATURKACZ.

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