GB2367776A - a removable backstop for spring collets - Google Patents

a removable backstop for spring collets Download PDF

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Publication number
GB2367776A
GB2367776A GB0021035A GB0021035A GB2367776A GB 2367776 A GB2367776 A GB 2367776A GB 0021035 A GB0021035 A GB 0021035A GB 0021035 A GB0021035 A GB 0021035A GB 2367776 A GB2367776 A GB 2367776A
Authority
GB
United Kingdom
Prior art keywords
backstop
collet
place
slots
adjusting screw
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Withdrawn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
GB0021035A
Other versions
GB0021035D0 (en
Inventor
Robert William Brown
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0021035A priority Critical patent/GB2367776A/en
Publication of GB0021035D0 publication Critical patent/GB0021035D0/en
Publication of GB2367776A publication Critical patent/GB2367776A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/208—Longitudinally-split sleeves, e.g. collet chucks with a tool positioning stop

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

A removable backstop 2 fits into the rear bore of a host collet 1 and is held in place by stepped keys 3, which fit into slots within the collet and corresponding slots in the backstop body 2, and cap screws 4 mounted in the backstop. Accurate depth location of a component, such as a bar for example, within the collet is affected by adjustable screw 5.

Description

Description: A Backstop for the spring type workholding Collets used in machine tools and associated equipment.
These collets are made to hold workpieces during the machining process and have a through bore to accept long pieces of bar.
The problem arises when a second operation has to be carried out on a short workpiece, normally with the need to maintain a precise length throughout the batch of components.
My design for a backstop overcomes the problem of mounting a rigid and adjustable backstop to this type of Collet.
Current designs for this application involve fastening a plug into the rear bore of the Collet by means of a dowel pin.
This is an inconvenient and laborious way of achieving the objective and in fact damages the Collet.
My design of Backstop can be assembled in place in 3 minutes and does not involve carrying out any machining to the Collet.
The Collet is shown as item 1 on the enclosed drawing, and the backstop, item 2, fits into the rear bore of this Collet.
It is dimensioned to be compatible with the Collet manufacturers limits.
The Backstop is held in place by three stepped keys, items 3, described as Tabnuts on the drawing, which fit into the three slots or holes in the Collet wall and are pulled back by the small cap screws, item 4.
This arrangement holds the backstop firmly in position, enabling the component held in the Collet to be located accurately against the adjusting screw, item 5.
When assembled, the Collet and Backstop are effectively one unit and can be removed as an assembly for cleaning then replaced in the machine without any need for resetting.
While this is a simple device, it is one that answers a problem that has to date not been satisfactorily addressed in this application.
It has been fully tested in machine shop conditions and found to be both convenient and effective in use.
These Collets are in worldwide use and therefore the market potential is substantial.

Claims (5)

Claims.
1. A cylindrical backstop designed to be mounted on the spring type work holding Collets used in machine tools and associated equipment.
2. A backstop as claimed in claim 1 and illustrated in figures 1 and 2 of the accompanying drawing.
3. A backstop as claimed in claim 1, which uses stepped keys to fit into the Collet slots and the corresponding slots in the backstop body which then are held in place by bolts to hold the assembly firmly in place.
4. A backstop as claimed in claims 1,2 and 3 with an adjusting screw which provides for a range of adjustment to suit workpieces of different lengths.
5. A backstop as claimed in claims 1,2 and 3 which is unique from other types of backstops in that it can be attached securely to the type of spring collets which do not have a thread in the rear bore. This is due to the way in which the stepped keys referred to in claim 3 form the method of attachment.
5. This backstop is easily assembled into the Collet without any need to modify the host Collet.
Amendments to the claims have been filed as follows
Claims.
1. A cylindrical backstop designed to be mounted on the spring type work holding Collets used in machine tools and associated equipment.
2. A backstop as claimed in claim 1 and illustrated on the accompanying drawing.
3. A backstop as claimed in claim 1, which uses stepped keys to fit into Collet slots and to corresponding slots in the backstop body, which are then held in place by bolts, to hold the assembly firmly in place.
4. A backstop as claimed in claims 1,2 and 3 with an adjusting screw which provides for a range of adjustment to suit workpieces of different lengths. This adjusting screw is not in itself claimed to be unique, but is a normal part of any backstop device.
GB0021035A 2000-08-26 2000-08-26 a removable backstop for spring collets Withdrawn GB2367776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0021035A GB2367776A (en) 2000-08-26 2000-08-26 a removable backstop for spring collets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0021035A GB2367776A (en) 2000-08-26 2000-08-26 a removable backstop for spring collets

Publications (2)

Publication Number Publication Date
GB0021035D0 GB0021035D0 (en) 2000-10-11
GB2367776A true GB2367776A (en) 2002-04-17

Family

ID=9898347

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0021035A Withdrawn GB2367776A (en) 2000-08-26 2000-08-26 a removable backstop for spring collets

Country Status (1)

Country Link
GB (1) GB2367776A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676810A (en) * 1952-01-11 1954-04-27 Herschell C Landreth Workpiece backstop for lathe collet chucks
GB1386110A (en) * 1972-10-05 1975-03-05 Gibbs J A Adjustable backstop for use in the spindle of a centre lathe
GB2014884A (en) * 1978-02-20 1979-09-05 Heidelberger Druckmasch Ag Chucks
US5918515A (en) * 1996-10-09 1999-07-06 Hinson; Ronald L. Lathe reference stop and combination tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676810A (en) * 1952-01-11 1954-04-27 Herschell C Landreth Workpiece backstop for lathe collet chucks
GB1386110A (en) * 1972-10-05 1975-03-05 Gibbs J A Adjustable backstop for use in the spindle of a centre lathe
GB2014884A (en) * 1978-02-20 1979-09-05 Heidelberger Druckmasch Ag Chucks
US5918515A (en) * 1996-10-09 1999-07-06 Hinson; Ronald L. Lathe reference stop and combination tool

Also Published As

Publication number Publication date
GB0021035D0 (en) 2000-10-11

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Legal Events

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