GB725842A - Improvements in electrically operated hand tools - Google Patents

Improvements in electrically operated hand tools

Info

Publication number
GB725842A
GB725842A GB7271/53A GB727153A GB725842A GB 725842 A GB725842 A GB 725842A GB 7271/53 A GB7271/53 A GB 7271/53A GB 727153 A GB727153 A GB 727153A GB 725842 A GB725842 A GB 725842A
Authority
GB
United Kingdom
Prior art keywords
motor
casing
support
insulating
cap
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
Application number
GB7271/53A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB725842A publication Critical patent/GB725842A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H02K7/145—Hand-held machine tool

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Dc Machiner (AREA)

Abstract

725,842. Motor-driving arrangements. BOSCH GES., R. March 17, 1953 [April 30, 1952], No. 7271/53. Class 35. [Also in Groups XXII and XXIII] A portable electrically driven hand tool such as a grinding or drilling machine has a metallic supporting member 41 carrying on one side a gear casing 31 and on the other side an electric motor 11 covered by an insulating cap 21, and an insulating member 17 clamped between the motor and the support 41 having a centreing surface(s) for the motor and being itself centred in the support 41. The latter is cast from light metal and is in the form of a tube open at both ends and having a perforated transverse wall 42. The motor 11 is mainly supported by the support 41 by bolts 43 threaded into a tension plate 20 having radial projections 20a engaging slots in the motor casing 16. The insulating plate 17 insulates the support 41 from the casing 16 and the bolts 43 are almost completely covered by insulating bushes 46, furthermore the insulating plate 17 has an annular groove 44 the outer walls of which help to centre the casing 16. The gear side bearing 15 of the motor shaft is located in a bore provided in the plate 17. At the inner end of the cap 21 there are mounted a condenser 27, a reversing switch 26 and contact springs 28, 29 engaging contact strips 52, 53, Fig. 3 (not shown), so as to form an electrical connection of the motor with the incoming leads 22 when the switch is on. With this mounting arrangement, the supply to the motor is completely cut off as soon as the cap 21 is removed.
GB7271/53A 1952-04-30 1953-03-17 Improvements in electrically operated hand tools Expired GB725842A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE725842X 1952-04-30

Publications (1)

Publication Number Publication Date
GB725842A true GB725842A (en) 1955-03-09

Family

ID=6635064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7271/53A Expired GB725842A (en) 1952-04-30 1953-03-17 Improvements in electrically operated hand tools

Country Status (1)

Country Link
GB (1) GB725842A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344291A (en) * 1964-11-23 1967-09-26 Millers Falls Co Double insulated hand tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344291A (en) * 1964-11-23 1967-09-26 Millers Falls Co Double insulated hand tool

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