US3927864A

US3927864A - Lifting jack

Info

Publication number: US3927864A
Application number: US543832*A
Authority: US
Inventors: Jurgen Meierkort; Peter Schafer
Original assignee: Deutsche ITT Industries GmbH
Current assignee: TDK Micronas GmbH; ITT Inc
Priority date: 1974-01-28
Filing date: 1975-01-24
Publication date: 1975-12-23
Anticipated expiration: 1992-12-23
Also published as: ES434197A1; SE7500814L; IT1031112B; BR7500537A; DE2403853A1; JPS50117164A; SE383865B; GB1493055A; DE2403853B2; DE2403853C3; FR2259046B1; FR2259046A1; JPS5728680B2

Abstract

A lifting jack is disclosed for use in lifting automotive vehicles and other heavy objects. The jack includes a spur gear placed in slots in a guide housing such that the gear extends out of the guide housing through the slots. A pinion gear located outside the housing engages the spur gear and is driven by lever means to turn the spur gear. A lifting spindle is fastened to the spur gear within the housing.

Description

United States Patent 1191 Meierkort et a1.

[ Dec. 23, 1975 LIFIING JACK [75] Inventors: Jiirgen Meierkort, Wiedenest; Peter Schiifer, Gummersbach, both of Germany [73] Assignee: I'I'l Industries, Inc., New York,

[22] Filed: Jan. 24, 1975 [21] Appl. No: 543,832

[30] Foreign Application Priority Data Jan. 28, 1974 Germany 2403853 [52] US. Cl. 254/103 [51] Int. Cl. B66F 3/18 [58] Field of Search 254/98-107; 74/89.l5 R, 424.8

[56] References Cited UNITED STATES PATENTS 8/1951 Smith 254/103 2,738,952 3/1956 Nilson 254/99 2,750,150 6/1956 Lucker 254/103 FOREIGN PATENTS OR APPLICATIONS 836,398 4/1'952 Germany 254/103 944,086 8/1956 Germany 254/103 856,130 4/1961 United Kingdom 254/103 978,981 1/1965 United Kingdom 254/103 Primary Examiner0thell M. Simpson Attorney, Agent, or Firm-J. B. Raden; D. P. Warner v ABSTRACT A lifting jack is disclosed for use in lifting automotive vehicles and other heavy objects. The jack includes a spur gear placed in slots in a guide housing such that the gear extends out of the guide housing through the slots. A pinion gear located outside the housing engages the spur gear and is driven by lever means to turn the spur gear. A lifting spindle is fastened to the spur gear within the housing.

7 Claims, 2 Drawing Figures US. Patent Dec.23, 1975 Sheet10f2 3,927,864

LIFTING JACK BACKGROUND OF THE INVENTION 1. Field of The Invention This invention relates to a jack with a guide housing having a nut which is secured against twisting and carries a jack arm and is axially movable by means of a lifting spindle arranged in the guide housing, and with a jack gearing including a spur gear, a pinion and crank handle. A common use of the jack will be with motor vehicles.

2. Description of The Prior Art In the known jacks, the jack gearing is arranged above the guide housing. In this manner, the jack gearing increases the overall length of the jack. Moreover, practice has shown that the functioning capability of the jack may be adversely affected when the jack is dropped onto the jack arm in the direction of the longitudinal axis of the guide housing.

SUMMARY OF THE INVENTION Objects of the present invention therefore include the provision of a jack of the type mentioned at the outset, which is designed as compactly as possible, can be manufactured inexpensively and is insensitive to damage when dropped.

According to this invention, these objects are reached in that the spur gear is disposed inside the guide housing and that in the zone of the spur gear, the guide housing is designed with slots through which the spur gear projects out of the guide housing. It is an advantageous embodiment of the invention that the lifting spindle is axially supported, by means of the spur gear via a cage ball-bearing, on a base plate fastened in further slots of the guide housing. Advantages of this invention include the facts that the overall length of the guide housing is not increased by the jack gearing, and that an axial shifting of the spindle and of the spur gear is prevented owing to the arrangement of slots in the guide housing. Thus, it is secured that the functioning capability of the jack is not adversely affected when the jack is dropped inadvertantly resp. intentionally. As compared to known jacks, the assembly of this jack is cheapened owing to the fact that the spur gear, the cage ball-bearing and the base plate can be mounted onto the lifting spindle, and that this arrangement can be inserted as one unit into the slots of the guide housing. Besides the small design, another advantage of the inventive jack is that naturally less material expenditure than with comparable jacks is necessary for its manufacture.

BRIEF DESCRIPTION OF THE DRAWINGS An embodiment is illustrated in the drawings, in which:

FIG. 1 is a view of the entire inventive jack, and

FIG. 2 shows a partial section of the upper part of the inventive jack.

DESCRIPTION OF A PREFERRED EMBODIMENT The jack illustrated in FIGS. 1 and 2 includes a guide housing 1 with a jack foot 2. In the guide housing 1, there is a lifting spindle 3 by means of which a nut 4 is axially movable. In addition to this, nut 4 in guide housing 1 is secured against twisting.

Nut 4 carries a jackarm 5 which when the jack is used is put under the motor vehicle which is to be jacked up. As shown in the drawing, jack arm 5 is swivellingly connected to nut 4 so that arm 5 can be tilted onto the guide housing 1 in order that the jack can be better placed in the motor vehicle.

A spur gear 6 is securely connected to the lifting spindle 3. This spur gear 6 rests against a base plate 8 via a cage ball-bearing 7. Base plate 8 is held in

slots

9 and 10 of guide housing 1. Keys 11 and 12 or material deformation of base plate 8 serve as fastening.

As the diameter of spur gear 6 is larger than an external width dimension of guide housing 1,

further slots

13 and 14 have to be provided in guide housing 1. In this method, spur gear 6 projects out of

slots

13 and 14 and is in engagement with a pinion gear 15 which is arranged at an outside of guide housing 1 and can be rotated by means of a crank handle 16.

The top of the guide housing I is covered by a cover 18 which may be fastened in the

slots

13, 14 of guide housing 1.

In the inventive design of the jack, the forces acting upon jack arm 5 are supported at guide housing 1 via nut 4, spur gear 6, cage ball-bearing 7 and base plate 8.

The guide housing 1 transmits the resultant forces to the jack foot 2. i

To assemble the jack, lifting spindle 3 may be preassembled with base plate 8, cage ball-bearing 7 and spur gear 6. This unit is then inserted into guide housing 1. For this purpose,

slots

9 and 10 as well as

slots

13 and 14 naturally must be dimensioned adequately. It is a special advantage if the base plate 8 projects with an attachment 17 so far out of slot 9 that the base plate 8 simultaneously serves as a stop for pinion 15.

While the principles of the invention have been described above in connection with specific apparatus and applications, it is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention.

We claim:

1. A jack comprising a guide housing, a nut, said guide housing including an inside adapted to secure the nut against twisting, a jack arm pivotally connected to the nut, a lifting spindle arranged in the guide housing in engagement with the nut, the nut including means enabling it to be axially moved in cooperation with the lifting spindle, a spur gear, means inside the guide housing supporting the spur gear, a pinion gear, means connecting the pinion gear to a crank handle, means connecting the spur gear to the lifting spindle inside the guide housing and means including slots in the guide housing through which the spur gear projects out of the guide housing to engage the pinion gear.

2. A jack as claimed in claim I, in which the means supporting the spur gear includes a cage ball-bearing, a base plate and additional slots in the guide housing, and in which the spur gear is supported by the cage ballbearing on the base plate, and the base plate is secured in the additional slots in the guide housing.

3. A jack as claimed in claim 2, in which the lifting spindle, the spur gear, the cage ball-bearing and the base plate are formed as a unit and said unit issecured in the additional slots in the guide housing.

4. A jack as claimed in claim 2, in which the base plate includes an attachment. and the attachment projects out of one of the slots in the guide housing, enabling the attachment to serve as a stop for the pinion gear.

plate includes an attachment projecting through one of the slots in the guide housing, and means including keys for fastening the base plate to the guide housing.

7. A jack as claimed in claim 1, in which a cover is fastened in the slots in the guide housing.

Claims

2. A jack as claimed in claim 1, in which the means supporting the spur gear includes a cage ball-bearing, a base plate and additional slots in the guide housing, and in which the spur gear is supported by the cage ball-bearing on the base plate, and the base plate is secured in the additional slots in the guide housing.

3. A jack as claimed in claim 2, in which the lifting spindle, the spur gear, the cage ball-bearing and the base plate are formed as a unit and said unit is secured in the additional slots in the guide housing.

4. A jack as claimed in claim 2, in which the base plate includes an attachment, and the attachment projects out of one of the slots in the guide housing, enabling the attachment to serve as a stop for the pinion gear.

5. A jack as claimed in claim 2, in which the base plate includes an attachment projecting through one of the slots in the guide housing and means fastening the attachment to the guide housing, where said means include material deformed from the attachment.

6. A jack as claimed in claim 2, in which the base plate includes an attachment projecting through one of the slots in the guide housing, and means including keys for fastening the base plate to the guide housing.