GB2032881A - Lifting Devices and Vehicle Seats Incorporating Lifting Devices - Google Patents

Lifting Devices and Vehicle Seats Incorporating Lifting Devices Download PDF

Info

Publication number
GB2032881A
GB2032881A GB7933898A GB7933898A GB2032881A GB 2032881 A GB2032881 A GB 2032881A GB 7933898 A GB7933898 A GB 7933898A GB 7933898 A GB7933898 A GB 7933898A GB 2032881 A GB2032881 A GB 2032881A
Authority
GB
United Kingdom
Prior art keywords
sleeve
screw thread
ram
bushing
seat
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.)
Withdrawn
Application number
GB7933898A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rentrop Hubbert & Wagner
Original Assignee
Rentrop Hubbert & Wagner
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rentrop Hubbert & Wagner filed Critical Rentrop Hubbert & Wagner
Publication of GB2032881A publication Critical patent/GB2032881A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/185—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the drive mechanism
    • B60N2/1853—Linear actuator, e.g. screw mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/1803—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other with independent front and/or rear adjustment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/1807—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the cinematic
    • B60N2/181—Rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/18—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other
    • B60N2/185—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable the front or the rear portion of the seat being adjustable, e.g. independently of each other characterised by the drive mechanism
    • B60N2/1871—Worm and worm gear articulations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/10—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated with telescopic sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/18—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through worm gearings

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Seats For Vehicles (AREA)
  • Transmission Devices (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

A lifting device for a vehicle seat includes a housing (3) rotatably supporting a worm wheel (7). A worm (11) meshes with the worm wheel (7), which is internally screw-threaded and is screw-threadedly engaged by a sleeve (10) which has both an external and an internal screw-thread (10b, 10a). The internal screw-thread (10a) is engaged by a screw-threaded ram 5. A shoulder 10c on the sleeve 10 limits the upwards movement of the sleeve relative to the housing (3) and an abutment (5b) on the ram 5 limits upwards movement of the ram relative to the sleeve (10). <IMAGE>

Description

SPECIFICATION Lifting Devices and Vehicle Seats Incorporating Lifting Devices The present invention relates to lifting devices and to vehicle seats incorporating such lifting devices.
According to the invention there is provided a lifting device comprising a housing rotatably supporting a bushing having an internal screw thread, a sleeve having an internal and an external screw thread which external screw thread screw threadedly engages the internal screw thread of the bushing, first abutment means for limiting relative axial movement between the bushing and the sleeve, and a ram having one end portion arranged to be secured to an object to be lifted, and its opposite end portion in screw threaded engagement with the internal screw thread of the sleeve.
According to the invention there is further provided a vehicle seat comprising a seat portion, a support secured to the underside of the seat portion and at least two lifting devices supporting the support to raise and lower the seat portion, each lifting device comprising a ram, having one end portion secured to the support, and its other end portion having an external screw thread, a sleeve having an internal screw thread screw threadedly engaging the external screw thread of the ram, and an external screw thread, a rotary worm wheel having an internal screw thread screw threadedly engaging the external screw thread of the sleeve, a worm meshing with the worm wheel, and abutment means for imprisoning the worm wheel against axial movement, for limiting the relative axial movement between the worm wheel and the sleeve and for limiting the relative axial movement between the sleeve and the ram.
A seat raising and lowering device as incorporated in a vehicle seat and embodying the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings, in which: Figures 1 to 3 are side elevations of the vehicle seat in three different operative attitudes; Figure 4 is a vertical section, to an enlarged scale, of the device of Figure 1; Figure 5 is a vertical section, to an enlarged scale, of the device of Figure 3; and Figure 6 is a section taken on the iine VI--VI of Figure 4.
Figures 1 to 3 show the seat portion 1 of a motor vehicle seat in three different attitudes.
These attitudes are achieved by controlling corresponding ones of lifting devices 2, each having a housing secured to a carriage 4 slidable on rails (not shown) fixed to the floor of the vehicle.
Each lifting device 2 shown in more detail in Figures 4 to 6 includes a ram 5 having an upper screw threaded portion of reduced cross-section which engages an opening in a corresponding end portion of an elongate beam 6. A nut screw threaded by engaging the end portion of ram 5 imprisons the beam 6 on the ram but allows relative pivotal movement between the beam and the ram. The beam has a central portion rigidily secured to the underside of the vehicle seat.
A bushing 7 having an internal screw thread 7a is rotatably supported by bearings 8 and 9 which imprison the bushing against axial displacement.
A sleeve 10 having an internal screw thread 1 Oa and an external screw thread 1 Ob screw threadedly engages the bushing 7 with its external thread 1 Ob and screw threadedly engages a screw threaded portion 5a of the ram with its internal thread 7a.
The external screw thread 1 Ob is on an enlarged diameter lower end portion of the sleeve 10 having a shoulder 1 Oc which acts as an abutment for engaging an inwardly extending annular flange at the upper end of the bushing and so limits axial movement of the sleeve 10 out of the bushing (see Fig. 5).
The ram 5 at its lower end has a portion of enlarged diameter which acts as an abutment 5b for engaging a shoulder portion 1 Od of a reduced internal diameter portion of the sleeve carrying the screw thread 1 Oa and so limits the extent to which the ram 5 can project from the sleeve 10.
A central section of the bushing 7 carries an outer worm wheel portion which meshes with a worm 11.
In operation, with the lifting device in the position shown in Figure 4, the worm 11 is driven and this causes the bushing 7 to rotate. Since the upper end of the ram 5 is held against rotation by the beam 6 the sleeve 10 will be rotated lifting itself out of the housing until the shoulder 1 Oc abuts the annular flange of the bushing 7.
Thereafter the sleeve 10 is locked to the bushing and continued rotation will drive the ram 5 upwardly out of the sleeve 10. Movement of the ram is halted when the abutment 1 Od engages the shoulder in the sleeve 10. To lower the ram and sleeve the worm is driven in the opposite sense. A drive (not shown) which may be manual or powered is operable to effect rotation of the worm in both senses.
A control system for controlling the two lifting devices shown in Figure 1 is operable to selectively drive one or both lifting devices so as to effect a raising or lowering or filting of the seat portion of the seat (see Figures 3 and 2).
Claims
1. A lifting device comprising a housing rotatably supporting a bushing having an internal screw thread, a sleeve having an internal and an external screw thread which external screw thread screw threadedly engages the internal screw thread of the bushing, first abutment means for limiting relative axial movement between the bushing and the sleeve, a ram having one end portion arranged to be secured to an object to be lifted, and its opposite end portion in screw threaded engagement with the internal screw thread of the sleeve.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Lifting Devices and Vehicle Seats Incorporating Lifting Devices The present invention relates to lifting devices and to vehicle seats incorporating such lifting devices. According to the invention there is provided a lifting device comprising a housing rotatably supporting a bushing having an internal screw thread, a sleeve having an internal and an external screw thread which external screw thread screw threadedly engages the internal screw thread of the bushing, first abutment means for limiting relative axial movement between the bushing and the sleeve, and a ram having one end portion arranged to be secured to an object to be lifted, and its opposite end portion in screw threaded engagement with the internal screw thread of the sleeve. According to the invention there is further provided a vehicle seat comprising a seat portion, a support secured to the underside of the seat portion and at least two lifting devices supporting the support to raise and lower the seat portion, each lifting device comprising a ram, having one end portion secured to the support, and its other end portion having an external screw thread, a sleeve having an internal screw thread screw threadedly engaging the external screw thread of the ram, and an external screw thread, a rotary worm wheel having an internal screw thread screw threadedly engaging the external screw thread of the sleeve, a worm meshing with the worm wheel, and abutment means for imprisoning the worm wheel against axial movement, for limiting the relative axial movement between the worm wheel and the sleeve and for limiting the relative axial movement between the sleeve and the ram. A seat raising and lowering device as incorporated in a vehicle seat and embodying the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings, in which: Figures 1 to 3 are side elevations of the vehicle seat in three different operative attitudes; Figure 4 is a vertical section, to an enlarged scale, of the device of Figure 1; Figure 5 is a vertical section, to an enlarged scale, of the device of Figure 3; and Figure 6 is a section taken on the iine VI--VI of Figure 4. Figures 1 to 3 show the seat portion 1 of a motor vehicle seat in three different attitudes. These attitudes are achieved by controlling corresponding ones of lifting devices 2, each having a housing secured to a carriage 4 slidable on rails (not shown) fixed to the floor of the vehicle. Each lifting device 2 shown in more detail in Figures 4 to 6 includes a ram 5 having an upper screw threaded portion of reduced cross-section which engages an opening in a corresponding end portion of an elongate beam 6. A nut screw threaded by engaging the end portion of ram 5 imprisons the beam 6 on the ram but allows relative pivotal movement between the beam and the ram. The beam has a central portion rigidily secured to the underside of the vehicle seat. A bushing 7 having an internal screw thread 7a is rotatably supported by bearings 8 and 9 which imprison the bushing against axial displacement. A sleeve 10 having an internal screw thread 1 Oa and an external screw thread 1 Ob screw threadedly engages the bushing 7 with its external thread 1 Ob and screw threadedly engages a screw threaded portion 5a of the ram with its internal thread 7a. The external screw thread 1 Ob is on an enlarged diameter lower end portion of the sleeve 10 having a shoulder 1 Oc which acts as an abutment for engaging an inwardly extending annular flange at the upper end of the bushing and so limits axial movement of the sleeve 10 out of the bushing (see Fig. 5). The ram 5 at its lower end has a portion of enlarged diameter which acts as an abutment 5b for engaging a shoulder portion 1 Od of a reduced internal diameter portion of the sleeve carrying the screw thread 1 Oa and so limits the extent to which the ram 5 can project from the sleeve 10. A central section of the bushing 7 carries an outer worm wheel portion which meshes with a worm 11. In operation, with the lifting device in the position shown in Figure 4, the worm 11 is driven and this causes the bushing 7 to rotate. Since the upper end of the ram 5 is held against rotation by the beam 6 the sleeve 10 will be rotated lifting itself out of the housing until the shoulder 1 Oc abuts the annular flange of the bushing 7. Thereafter the sleeve 10 is locked to the bushing and continued rotation will drive the ram 5 upwardly out of the sleeve 10. Movement of the ram is halted when the abutment 1 Od engages the shoulder in the sleeve 10. To lower the ram and sleeve the worm is driven in the opposite sense. A drive (not shown) which may be manual or powered is operable to effect rotation of the worm in both senses. A control system for controlling the two lifting devices shown in Figure 1 is operable to selectively drive one or both lifting devices so as to effect a raising or lowering or filting of the seat portion of the seat (see Figures 3 and 2). Claims
1. A lifting device comprising a housing rotatably supporting a bushing having an internal screw thread, a sleeve having an internal and an external screw thread which external screw thread screw threadedly engages the internal screw thread of the bushing, first abutment means for limiting relative axial movement between the bushing and the sleeve, a ram having one end portion arranged to be secured to an object to be lifted, and its opposite end portion in screw threaded engagement with the internal screw thread of the sleeve.
2. A device according to Claim 1, including second abutment means for limiting relative axial movement between the sleeve and the ram.
3. A device according to Claim 1 or to Claim 2, including a worm wheel rigid with the bushing and a worm meshing with the worm wheel.
4. A vehicle seat comprising a seat portion, a beam rigidly secured to the underside of the seat portion, and two lifting devices each according to any preceding claim having their respective rams secured to opposite end portions of the beam.
5. A vehicle seat according to Claim 4 including control means for seiectively controlling the two lifting devices whereby to vary the attitude of the sitting portion of the seat.
6. A vehicle seat comprising a seat portion, a support secured to the underside of the seat portion and at least two lifting devices supporting the support to raise and lower the seat portion, each lifting device comprising a ram, having one end portion secured to the support, and its other end portion having an external screw thread, a sleeve having an internal screw thread screw threadedly engaging the external screw thread of the ram, and an external screw thread, a rotary worm wheel having an internal screw thread screw threadedly engaging the external screw thread of the sleeve, a worm meshing with the worm wheel, and abutment means for imprisoning the worm wheel against axial movement for limiting the relative axial movement between the worm wheel and the sleeve and for limiting the relative axial movement between the sleeve and the ram.
7. A vehicle seat substantially as hereinbefore described with reference to the accompanying drawings.
8. A lifting device substantially as hereinbefore described with reference to the accompanying drawings.
GB7933898A 1978-10-05 1979-10-01 Lifting Devices and Vehicle Seats Incorporating Lifting Devices Withdrawn GB2032881A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782843395 DE2843395A1 (en) 1978-10-05 1978-10-05 LIFTING DEVICE

Publications (1)

Publication Number Publication Date
GB2032881A true GB2032881A (en) 1980-05-14

Family

ID=6051434

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7933898A Withdrawn GB2032881A (en) 1978-10-05 1979-10-01 Lifting Devices and Vehicle Seats Incorporating Lifting Devices

Country Status (11)

Country Link
JP (1) JPS5556995A (en)
AU (1) AU512642B2 (en)
BE (1) BE879206A (en)
BR (1) BR7906443A (en)
DE (1) DE2843395A1 (en)
ES (1) ES484734A1 (en)
FR (1) FR2438007A1 (en)
GB (1) GB2032881A (en)
IT (1) IT1127832B (en)
NL (1) NL7907387A (en)
SE (1) SE7908188L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222710A (en) * 1991-09-05 1993-06-29 Rockwell International Corporation Vertical seat position adjuster
EP0662582A1 (en) * 1994-01-05 1995-07-12 Müller Industrievertretungen GmbH Leveling shoe for height adjustment of machines and of apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016622U (en) * 1983-07-13 1985-02-04 トヨタ自動車株式会社 Seat cushion vertical position adjustment device
JPS63102532U (en) * 1986-12-24 1988-07-04
JP3268416B2 (en) * 1995-01-12 2002-03-25 関東自動車工業株式会社 Front seat vertical adjustment structure
CN108237952B (en) * 2016-12-26 2023-08-22 江苏卡威汽车工业集团有限公司 Oil-electricity hybrid vehicle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR552918A (en) * 1922-05-16 1923-05-09 Quick rise jack
GB321525A (en) * 1928-10-09 1929-11-14 Stanley Hill Improvements in and connected with lifting jacks
FR684156A (en) * 1929-10-29 1930-06-23 Jack
US1928402A (en) * 1933-05-26 1933-09-26 Walker Mfg Co Lifting jack
FR1289928A (en) * 1961-05-24 1962-04-06 Metallifacture Ltd Jacks
US3316034A (en) * 1964-07-14 1967-04-25 Gen Motors Corp Slip-in bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222710A (en) * 1991-09-05 1993-06-29 Rockwell International Corporation Vertical seat position adjuster
US5299771A (en) * 1991-09-05 1994-04-05 Rockwell International Corporation Vertical seat position adjuster
EP0662582A1 (en) * 1994-01-05 1995-07-12 Müller Industrievertretungen GmbH Leveling shoe for height adjustment of machines and of apparatus

Also Published As

Publication number Publication date
SE7908188L (en) 1980-04-06
ES484734A1 (en) 1980-06-16
BE879206A (en) 1980-02-01
NL7907387A (en) 1980-04-09
DE2843395A1 (en) 1980-04-24
IT1127832B (en) 1986-05-28
AU5136279A (en) 1980-04-17
AU512642B2 (en) 1980-10-23
BR7906443A (en) 1980-06-03
IT7985595A0 (en) 1979-10-04
JPS5556995A (en) 1980-04-26
FR2438007A1 (en) 1980-04-30

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Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)